JP2009155457A - Manufacturing method of polymer having (poly) alkylene glycol chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the manufacturing method of a polymer which can be suitably used for various uses such as a cement admixture and can develop high dispersion performance to a cement composition. <P>SOLUTION: The manufacturing method of the polymer having a (poly)alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly)alkylene glycol based ether monomer includes: a step for reacting alkylene oxide with a monomer component in which an unsaturated (poly) alkylene glycol based ether monomer whose average addition number of moles of an oxyalkylene group is <30 and the isomer thereof are mixed in a ratio of 100:0 to 2 by mass to obtain a monomer component in which an unsaturated (poly)alkylene glycol based ether monomer whose average addition number of moles of the oxyalkylene group is ≥50 and the isomer thereof are mixed in a ratio of 100:0 to 10 by mass; and a step for polymerizing the monomer component containing the unsaturated (poly) alkylene glycol based ether monomer whose average addition number of moles of the oxyalkylene group is ≥50 as an indispensable component. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a method for producing a polymer having a (poly) alkylene glycol chain. More specifically, the present invention relates to a method for producing a polymer having a (poly) alkylene glycol chain that can be suitably used for cement compositions such as cement paste, mortar, and concrete.

The polymer having a (poly) alkylene glycol chain is used as a hydrophilic polymer for various purposes, and is particularly useful as a dispersant or the like. For example, it exhibits water reduction performance for cement compositions such as cement paste, mortar and concrete, and is widely used as a cement admixture or concrete admixture, etc., and constructs civil engineering and building structures etc. from cement composition It is indispensable to do. Such a cement admixture has the effect of improving the strength, durability, and the like of the cured product by increasing the fluidity of the cement composition and reducing the water content of the cement composition. Among these water reducing agents, polycarboxylic acid cement admixtures or concrete admixtures containing polycarboxylic acid polymers exhibit high water reducing performance compared to conventional water reducing agents such as naphthalene, so high performance AE Has many achievements as a water reducing agent.

As a polycarboxylic acid polymer suitable for such a cement admixture, a copolymer of an alkenyl ether alkylene oxide adduct and an unsaturated carboxylic acid has been studied. Specifically, a binary copolymer having poly (ethylene / propylene) glycol alkenyl ether and unsaturated carboxylic acid as essential constituent units (for example, see Patent Documents 1 and 2), (1) polyethylene glycol (meta) A quaternary copolymer of allyl ether, (2) polyalkylene glycol (meth) allyl ether, (3) (meth) acrylic acid, and (4) sulfonic acid group-containing monomer (see, for example, Patent Document 3). ), (1) polyethylene glycol (meth) allyl ether, (2) polypropylene glycol (meth) allyl ether, and (3) unsaturated carboxylic acid (see, for example, Patent Document 4). It is disclosed.

Also, a copolymer of an alkylene oxide (AO) adduct of an alkenyl ether having 2 to 4 carbon atoms and methacrylic acid (for example, see Patent Document 5), a copolymer of a methallyl ether AO adduct and acrylic acid (for example, , Patent Document 6), (1) C2-C4 alkenyl ether AO adduct (addition mole number n = 1-100), and (2) C2-C4 alkenyl ether AO adduct (addition). Mole number n = 11 to 300) and (3) a terpolymer of an unsaturated monocarboxylic acid, a copolymer of (1) and (3), and a copolymer of (2) and (3). Blend (for example, refer patent document 7), C2-C4 alkenyl ether AO adduct and maleic acid copolymer (A), unsaturated polyalkylene glycol ether monomer, and no alkenyl group Non-polymerizable polyalkyl And glycol, copolymer (A) and the cement admixture comprising four components of different polymers (e.g., see Patent Document 8.) Is disclosed.

Moreover, as a manufacturing method of the polymer which has a (poly) alkylene glycol chain, the manufacturing example (for example, refer patent documents 5-8) which added 10-200 mol of ethylene oxide (EO) to methallyl alcohol, 70 mol of EO is mentioned. Production examples in which 5 moles of propylene oxide (PO) are further added (for example, see Patent Documents 5 and 6) are disclosed. These EO addition methods are methods in which methallyl alcohol is used as a starting material to add to a desired number of EO addition moles at a reaction temperature of 150 ° C. and to a desired number of EO addition moles in one step.
However, when a polymer having a (poly) alkylene glycol chain is used for a cement composition or the like, it is required to be excellent in various performances and to be versatile at a low cost. There was a need for a method of producing Furthermore, by improving dispersibility and water reduction, improving the fluidity retention of concrete, etc. at the manufacturing site, and making the state of concrete, etc. easier to work, civil engineering, building structures, etc. There was room for improvement to further improve work efficiency, etc. at the construction site, and improve properties such as concrete.
JP-A-10-194808 JP-A-11-106247 JP 2000-034151 A JP 2001-220194 A JP 2002-34816 A JP 2002-121055 A JP 2003-221266 A JP-T-2006-522734

The present invention has been made in view of the above situation, and can be suitably used for various applications such as a cement admixture, and can exhibit high dispersion performance with respect to a cement composition (poly) alkylene glycol. It aims at providing the manufacturing method of the polymer which has a chain | strand.

The present inventor has made various studies on the production method of a polymer having a (poly) alkylene glycol chain, and polymerizes an unsaturated (poly) alkylene glycol ether monomer with a specific component content not more than a specific amount. It has been found that the resulting polymer improves various properties of the cement composition and exhibits properties such as excellent dispersion performance of the cement composition and excellent fluidity retention performance. Further, the inventors have found a method for producing such a polymer with high productivity and have come up with the idea that the above-mentioned problems can be solved brilliantly.

That is, the present invention is a method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly) alkylene glycol ether monomer, the production method comprising: An alkylene oxide is reacted with a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of less than 30 and its isomer is 100: 0 to 2 by mass ratio. A step of obtaining a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups of 50 or more and its isomer is 100: 0 to 10 by mass ratio; And a step of polymerizing essentially a monomer component containing an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of 50 or more. The containing (poly) a polymer production process of having an alkylene glycol chain.
The present invention is also a polymer having a (poly) alkylene glycol chain obtained by the above production method.
The present invention is described in detail below.

The present invention is a method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly) alkylene glycol ether monomer. In such a production method, the resulting polymer having a (poly) alkylene glycol chain can exhibit excellent properties such as cement composition dispersion performance, fluidity retention performance, etc., cement admixture, inorganic pigment dispersion It can be suitably used for various uses such as a builder for detergents and detergents.
In the present specification, the “unsaturated (poly) alkylene glycol ether monomer” means an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of less than 30 of oxyalkylene groups, It refers to both unsaturated (poly) alkylene glycol ether monomers having an average added mole number of alkylene groups of 50 or more. In addition, “unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of less than 30” is referred to as “n30 unsaturated (poly) alkylene glycol ether monomer”, “n30 unsaturated (poly ) “Isomer of alkylene glycol ether monomer” as “n30 isomer” and “unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of 50 or more of oxyalkylene group” as “n50 unsaturated ( “Poly) alkylene glycol ether monomer” and “isomer of n50 unsaturated (poly) alkylene glycol ether monomer” are also referred to as “n50 isomer”.
“Part” means “part by mass” and “unsaturated (poly) alkylene glycol” or “having (poly) alkylene glycol chain” includes a case where only one alkylene oxide is attached. . That is, the polyalkylene glycol chain includes a case where only one alkylene oxide is attached. Similarly, (poly) oxyalkylene includes a case where only one alkylene oxide is attached.

The above production method is applied to a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups of less than 30 and its isomer is 100: 0 to 2 in mass ratio. A monomer in which an alkylene oxide is reacted to give an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of 50 or more and its isomer in a mass ratio of 100: 0 to 10 The process of obtaining an ingredient is included.
In the above process, a monomer component (hereinafter referred to as 100: 0 to 2) in mass ratio of an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of less than 30 and its isomer Simply referred to as “n30 monomer component”) includes an n30 unsaturated (poly) alkylene glycol ether monomer and an n30 isomer in the above proportion. The content of the n30 isomer is 0 to 2 parts (2 parts or less) with respect to 100 parts of the n30 unsaturated (poly) alkylene glycol ether monomer. If it exceeds 2 parts, the monomer component obtained after addition of alkylene oxide (unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of 50 or more and its isomer are in mass. In the monomer component having a ratio of 100: 0 to 10, the amount of n50 isomer may be increased. In addition, the polymerization rate (polymer pure content) of the polymer having a (poly) alkylene glycol chain obtained in the polymerization process is lowered, and the cement composition dispersion performance and fluidity retention performance may not be sufficiently excellent. There is. The content of the n30 isomer is 2 parts or less with respect to 100 parts of the n30 unsaturated (poly) alkylene glycol ether monomer. Preferably it is 1.5 parts or less, More preferably, it is 1.25 parts or less, More preferably, it is 1 part or less, More preferably, it is 0.75 part or less, More preferably, it is 0.5 part or less, More preferably, it is 0.25 part or less. More preferably, it is 0.1 parts or less. It is preferable that it is contained substantially.
The n30 unsaturated (poly) alkylene glycol ether monomer and n30 isomer have an average addition mole number of oxyalkylene group of less than 30, preferably 1 to 25, more preferably 1 to 20, and still more preferably. 1-10.

Monomer component (hereinafter simply referred to as “mass ratio”) of an unsaturated (poly) alkylene glycol ether monomer having an average added mole number of the oxyalkylene group of 50 or more and its isomer. The “n50 monomer component”) includes an n50 unsaturated (poly) alkylene glycol ether monomer and an n50 isomer in the above ratio. The content of the n50 isomer is 0 to 10 parts (10 parts or less) with respect to 100 parts of the n50 unsaturated (poly) alkylene glycol ether monomer. When it exceeds 10 parts, the polymerization rate (polymer pure content) of the polymer having a (poly) alkylene glycol chain obtained in the polymerization step is lowered, and the cement composition dispersion performance and fluidity retention performance are sufficiently excellent. There is a risk that it will not be. The content of n50 isomer is 10 parts or less with respect to 100 parts of n50 unsaturated (poly) alkylene glycol ether monomer. Preferably it is 8 parts or less, More preferably, it is 6 parts or less, More preferably, it is 5 parts or less, More preferably, it is 4 parts or less, More preferably, it is 3 parts or less, More preferably, it is 2 parts or less, More preferably, it is 1 part or less.
The n50 unsaturated (poly) alkylene glycol ether monomer and the n50 isomer have an average addition mole number of oxyalkylene group of 50 or more, and the average addition mole number is preferably somewhat large, for example, Is 75 or more, more preferably 100 or more, still more preferably 120 or more, particularly preferably 135 or more, and most preferably 150 or more. It is also preferred that the average added mole number is not too large, for example, preferably 300 or less, more preferably 280 or less, even more preferably 250 or less, particularly preferably 225 or less, and most preferably 200 or less.

As a production method of the present invention, an n30 monomer component containing an n30 unsaturated (poly) alkylene glycol ether monomer is reacted with an alkylene oxide to contain an n50 unsaturated (poly) alkylene glycol ether monomer. It includes a step of obtaining an n50 monomer component (also referred to as “addition step”) and a step of polymerizing the n50 monomer component (also referred to as “polymerization step”).
As the addition step, an alkylene oxide is added to a monomer component (n30 monomer component) containing an n30 unsaturated (poly) alkylene glycol ether monomer and an n30 isomer in the above-described ratio to produce an n50 unsaturated ( The process is not limited as long as a monomer component (n50 monomer component) containing the poly) alkylene glycol ether monomer and the n50 isomer in the above-mentioned ratio is obtained. Specifically, alkylene oxide addition may be performed at once, or may be performed in multiple stages (number of stages).

The number of stages of addition of the alkylene oxide varies depending on the number of moles of alkylene oxide added, and when the number of moles of addition is large, the number of stages is preferably multistage. The relationship between the desired number of moles of added alkylene oxide and the number of added alkylene oxide stages is preferably as follows. When the number of added moles of alkylene oxide is 10 moles or less, the addition is preferably performed in one or two stages. When the added mole number is 11 to 50 moles, it is preferably added in 1 to 3 steps. When the alkylene oxide added mole number is 51 to 150 moles, it is preferably added in 1 to 5 steps, and more preferably 1 step. It is preferable to add in ~ 4 steps, more preferably in 1-3 steps. When the number of moles of alkylene oxide added is 151 to 300 moles, it is preferably added in 2 to 8 steps, more preferably in 2 to 6 steps, and further preferably in 2 to 5 steps. It is preferable to add in 2 to 4 stages, more preferably.

The reaction temperature of the alkylene oxide addition reaction is preferably set so that the amount of n50 isomer produced falls within the above range. That is, it is presumed that the main factor of the double bond dislocation is heat. Therefore, the alkylene oxide addition temperature is preferably as low as possible. However, if the temperature is too low, the rate of the alkylene oxide addition reaction is remarkably reduced. Therefore, it is necessary to set an appropriate temperature range in consideration of productivity.
The upper limit of the alkylene oxide addition temperature is preferably 150 ° C. or lower, more preferably 145 ° C. or lower, more preferably 140 ° C. or lower, more preferably 135 ° C. or lower, more preferably 130 ° C., from the viewpoint of suppressing the dislocation of the double bond. Hereinafter, more preferably 125 ° C. or lower.
The lower limit of the alkylene oxide addition temperature is preferably 100 ° C. or higher, more preferably 105 ° C. or higher, further preferably 110 ° C. or higher, more preferably 115 ° C. or higher, from the viewpoint of the reaction rate and productivity of the alkylene oxide addition reaction. More preferably, it is not lower than ° C.
The reaction time of the above alkylene oxide addition reaction is such that when alkylene oxide is added in one step up to the desired number of moles of added alkylene oxide, when alkylene oxide is added through several steps of reaction up to the desired number of moles of added alkylene oxide. However, the reaction time at each stage is preferably within 60 hours. More preferably, it is within 50 hours, More preferably, it is within 40 hours, Especially preferably, it is within 30 hours, Most preferably, it is within 20 hours. When reaction time is too long, there exists a tendency for a double bond rearrangement and a by-product polyalkylene glycol to increase.
The addition reaction is preferably performed under pressure. The pressure at the start of the addition reaction is preferably 0.01 to 0.5 MPa, more preferably 0.05 to 0.3 MPa, and more preferably 0.1 to 0.2 MPa. The pressure during the addition reaction is preferably 0.9 MPa or less.

In the addition reaction, it is preferable to use a catalyst. As the catalyst, the rearrangement reaction proceeds remarkably under heat and acidic conditions, so that the alkylene oxide addition catalyst is more like sodium hydroxide, potassium hydroxide or lithium hydroxide than the acidic catalyst of boron trifluoride or titanium tetrachloride. Metal hydrides such as sodium hydride and potassium hydride; basic catalysts such as alkyl lithium such as butyl lithium and methyl lithium are preferred. Among these, metal hydroxides and metal hydrides are more preferable, and sodium hydroxide, potassium hydroxide, and sodium hydride are still more preferable.
As the amount of the catalyst used, it is preferable to reduce the amount of the basic catalyst as much as possible from the viewpoint of rearrangement of double bonds and by-production of polyethylene glycol even if it is a basic catalyst. As the amount of catalyst used (catalyst concentration), the weight ratio of the catalyst to the theoretical amount of alkylene oxide adduct calculated from the charged raw materials is preferably 10,000 ppm or less. More preferably, it is 8000 ppm or less, More preferably, it is 5000 ppm or less, Most preferably, it is 3000 ppm or less. More preferably, it is 1000 ppm or less, More preferably, it is 800 ppm or less, Especially preferably, it is 500 ppm or less, Most preferably, it is 300 ppm or less.
If the amount of the catalyst is excessively reduced, the rate and productivity of the alkylene oxide addition reaction are lowered, so the amount of catalyst is preferably 50 ppm or more. More preferably, it is 100 ppm or more, More preferably, it is 150 ppm or more, Especially preferably, it is 200 ppm or more, Most preferably, it is 250 ppm or more.

A mixture of the unsaturated (poly) alkylene glycol ether monomer having an average added mole number of the oxyalkylene group of less than 30 and its isomer is converted into an unsaturated alcohol or an unsaturated (poly) alkylene glycol ether monomer. It is preferably produced by a step of reacting an alkylene oxide. In other words, in the addition step, the n30 unsaturated (poly) alkylene glycol ether monomer as a raw material has a shorter oxyalkylene group than alcohol or n30 unsaturated (poly) alkylene glycol ether monomer. It is preferable to add an alkylene oxide to a saturated (poly) alkylene glycol ether monomer to obtain an n30 unsaturated (poly) alkylene glycol ether monomer. In the addition step for obtaining such an n30 unsaturated (poly) alkylene glycol ether monomer, the number of stages of alkylene oxide addition, the reaction temperature of the alkylene oxide addition reaction, the reaction time of the alkylene oxide addition reaction, the catalyst used, Various alkylene oxide addition conditions such as the amount of catalyst used are preferably the same as those in the alkylene oxide addition step for obtaining an n50 unsaturated (poly) alkylene glycol ether monomer. The n30 unsaturated (poly) alkylene glycol ether monomer obtained by such an alkylene oxide addition step has a low content of the by-product n30 isomer, and the n30 unsaturated (poly) alkylene glycol ether monomer It can be 0 to 2 parts per 100 parts. Therefore, the product obtained by the alkylene oxide addition reaction that produces an n30 unsaturated (poly) alkylene glycol ether monomer is directly used as the n30 monomer component described above as an n50 unsaturated (poly) alkylene glycol ether monomer. It can be used in an alkylene oxide addition step for obtaining a monomer. In this case, a purification step of the n30 unsaturated (poly) alkylene glycol ether monomer is not necessary, and productivity is improved.

The production method of the present invention is not particularly limited as long as it includes a step of obtaining an n50 monomer component by reacting an alkylene oxide with an n30 monomer component to obtain an n30 monomer component. As described above, it is preferable to obtain the n30 monomer component by addition of alkylene oxide. In other words, the present invention includes a step of obtaining an n30 monomer component by addition of alkylene oxide (also referred to as “step 1”) and a step of adding an alkylene oxide to the n30 monomer component to obtain an n50 monomer component (“ It is also preferable to include step 2 ”.
In the above step 1, an alkylene oxide is added to an unsaturated (poly) alkylene glycol ether monomer having an oxyalkylene group shorter than that of an alcohol or an n30 unsaturated (poly) alkylene glycol ether monomer, and the n30 unsaturated The step is preferably a step of obtaining a (poly) alkylene glycol ether monomer by one or several steps of alkylene oxide addition reaction.
As the above step 2, the n30 unsaturated (poly) alkylene glycol ether monomer obtained in the above step 1 is unsaturated (polyalkylene addition mole number 50 or more by addition of one or several steps of alkylene oxide addition reaction). It is preferable to obtain it through a step of obtaining an alkylene glycol ether monomer.

As a suitable form of the above steps 1 and 2, for example, when a monomer in which 120 mol of ethylene oxide is added to methallyl alcohol is synthesized, an adduct in which 10 mol of ethylene oxide is added to methallyl alcohol as a first-stage reaction. (Step 1) In the second step, 40 mol of ethylene oxide was added to the 10 mol adduct synthesized in the first step reaction, and 50 mol of ethylene oxide was added to methallyl alcohol (step). 2-1) Add 70 moles to the adduct obtained by adding 50 moles of ethylene oxide to the methallyl alcohol obtained in the second stage reaction as the third stage reaction, and add ethylene oxide to the desired methallyl alcohol. In this form, 120 mol added monomer is obtained (step 2-2).
The alkylene oxide addition conditions in steps 1 and 2 are the same as described above. Among these addition conditions, as the number of stages of alkylene oxide addition, particularly when 10 moles or more of alkylene oxide is added, the method of synthesis through several stages of alkylene oxide addition reaction up to the desired number of moles of alkylene oxide is the reaction time. It is preferable from the viewpoint of shortening and improving productivity. Moreover, since reaction time can be shortened, the production | generation of the by-product during reaction can be suppressed. The number of reaction stages up to the desired number of moles of added alkylene oxide is not limited, but if the number of stages is too large, productivity is lowered, and therefore 10 stages or less are preferable, more preferably 8 stages or less, and even more preferably 5 stages or less. Preferably, it is preferably 4 steps or less, more preferably 3 steps or less, and further preferably 2 steps or less.

In step 1 and step 2, the reaction temperature and reaction time of the alkylene oxide addition reaction are as follows: (1) When the reaction temperature is changed at least once in either step 1 or step 2, It is preferable that the reaction time is 50% or less and / or (2) the average reaction temperature is 150 ° C. or less. The temperature change may be performed in either step 1 or step 2, and the number of temperature changes is not particularly limited. Specifically, when changing the reaction temperature between step 1 and step 2, (1) it is preferable to set the reaction time of 150 ° C. or higher to 50% or less, (2) the average value of reaction temperature is 150 ° C. or lower. It is preferable to make it. (3) It is preferable to set the process having a long reaction time to 150 ° C. or less. (4) Since the unsaturated (poly) alkylene glycol ether monomer having a long oxyalkylene group tends to rearrange, It is preferable to lower the reaction temperature in step 2 than in step 1.
When the reaction temperature is changed during each of the steps 1 and 2, it is preferable that (1) the reaction time of 150 ° C. or higher is 50% or less, (2) the average value of the reaction temperature is 150 ° C. or lower. It is preferable to make it.
The same applies to the case where at least one of the steps 1 and 2 is performed in two or more steps. (1) The reaction temperature of 150 ° C. or more is set to 50% or less of the total reaction time and / or (2) The average reaction temperature is preferably set to 150 ° C. or lower. Especially, it is most preferable that the reaction temperature of two or more steps constituting Step 1 and Step 2 is 150 ° C. or lower. When the reaction temperature is different at each stage, the reaction temperature of 150 ° C. or lower is preferably the main reaction temperature. For example, (1) the average value of the reaction temperature in each stage is 150 ° C. or less, (2) the average value of the reaction temperature in all the alkylene oxide addition reactions is 150 ° C. or less, and (3) the total reaction time in each stage The reaction time of 150 ° C. or higher is preferably 50% or less.

The unsaturated (poly) alkylene glycol ether monomer preferably has a group having an unsaturated bond, an alkylene glycol moiety, and an ether bond. In the unsaturated (poly) alkylene glycol ether monomer of the present invention, first, the n30 unsaturated (poly) alkylene glycol ether monomer will be described. The n30 unsaturated (poly) alkylene glycol ether monomer is represented by the following general formula (1):
X—O— (R ¹ O) _n30 —R ² (1)
(In the formula, X represents an alkenyl group having 2 to 6 carbon atoms, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N30 is a number of less than 30 and is an average of oxyalkylene groups. It represents the number of added moles, and R ² is preferably a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms.

In the above general formula (1), X is an alkenyl group having 2 to 6 carbon atoms. The alkenyl group is more preferably an alkenyl group having 3 to 5 carbon atoms, still more preferably an alkenyl group having 3 to 4 carbon atoms, and further preferably an alkenyl group having 4 carbon atoms. Specific examples of the alkenyl group include 3-methyl-3-butenyl group, 4-pentenyl group, 3-pentenyl group, 2-methyl-2-butenyl group, 2-methyl-3-butenyl group, 1,1-dimethyl group. C2-alkenyl group such as 2-propenyl group, methallyl group, 3-butenyl group, 2-butenyl group, carbon number 4 such as 1-methyl-2-butenyl group, carbon number such as allyl group Three alkenyl groups are preferred. Among these, a methallyl group, an allyl group, and a 3-methyl-3-butenyl group are preferable, and a methallyl group is particularly preferable.

R ¹ O is an oxyalkylene group having 2 to 18 carbon atoms. The oxyalkylene group is preferably an oxyalkylene group having 2 to 8 carbon atoms, and more preferably an oxyalkylene group having 2 to 4 carbon atoms. Specifically, one or more of an oxyethylene group, an oxypropylene group, an oxybutylene group, an oxystyrene group, and the like are preferable, and among them, an oxyethylene group is preferable. When it has 2 or more types of oxyalkylene groups, it is preferable that an oxyethylene group is 80 mol% or more. Thereby, it can be set as the unsaturated (poly) alkylene glycol type | system | group ether monomer which maintains the balance of hydrophilic property and hydrophobicity, and exhibits the outstanding dispersion performance. If it is less than 80 mol%, the unsaturated (poly) alkylene glycol ether monomer may not exhibit sufficient dispersibility. More preferably, it is 85 mol% or more, still more preferably 90 mol% or more, particularly preferably 95 mol% or more, and most preferably 100 mol%.
As a combination in the case of having two or more kinds of oxyalkylene groups, (oxyethylene group, oxypropylene group), (oxyethylene group, oxybutylene group), (oxyethylene group, oxystyrene group) are preferable. Among these, (oxyethylene group, oxypropylene group) is more preferable.

The average added mole number n30 of the alkylene oxide is a number of less than 30. As average addition mole number n30, 1-25 are preferable, More preferably, it is 1-20, More preferably, it is 1-10.
R ² is preferably a hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, a phenyl group, an alkyl-substituted phenyl group, an alkenyl group, or an alkynyl group. More preferably, they are a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, a phenyl group, an alkyl-substituted phenyl group, an alkenyl group, and an alkynyl group, and more preferably a hydrogen atom and a linear chain having 1 to 4 carbon atoms. Or, it is a branched alkyl group, a phenyl group, an alkyl-substituted phenyl group, an alkenyl group, or an alkynyl group, and particularly preferably a hydrogen atom, a methyl group, or an ethyl group.

Specific examples of the n30 unsaturated (poly) alkylene glycol ether monomer include (poly) alkylene glycol methallyl ethers, (poly) alkylene glycol allyl ethers, (poly) alkylene glycol 3-methyl-3-butene. Tenenyl ethers and the like are preferred. Specifically, polyethylene glycol methallyl ethers, polyethylene glycol allyl ethers, and polyethylene glycol 3-methyl-3-butenyl ethers are preferable. More preferred are polyethylene glycol methallyl ethers.

As the n30 unsaturated (poly) alkylene glycol ether monomer, any of those described above can be suitably used, and among them, the following general formula (2):
_{CH 2 = C (CH 3)} CH 2 -O- (R 1 O) n30 -R 2 (2)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N30 is a number of less than 30 and represents the average number of moles added of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups are preferable.) In the above formula, R ¹ O is an oxyalkylene group having 2 to 18 carbon atoms. In the above formula, R ¹ O, n30, and R ² are preferably the same as described above.

The n30 isomer may be an isomer of the above-exemplified n30 unsaturated (poly) alkylene glycol ether monomer, preferably a stereoisomer, more preferably a geometric isomer. . That is, it is preferable that the n30 isomer has a group having an unsaturated bond, an alkylene glycol moiety, and an ether bond. Specifically, the following general formula (3):
(CH ₃ ) ₂ C═CH—O— (R ¹ O) _t30 —R ² (3)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. T30 is a number of less than 30 and represents the average number of moles added of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups are preferable.) In the above formula, R ¹ O and R ² are preferably the same as those described above. The t30 is preferably in the same range as n30 described above.

In the n30 isomer, when the n30 unsaturated (poly) alkylene glycol ether monomer has a terminal double bond represented by the general formula (2), the double bond of the monomer is transferred. This produces the n30 isomer, which is thought to cause isomerization by heat. Specifically, it is considered that the main factor of the rearrangement from the terminal double bond such as methallyl alcohol EO (ethylene oxide) adduct to the internal double bond is due to heat. That is, the unsaturated (poly) alkylene glycol ether monomer having less thermal history has fewer isomers (also referred to as “double bond transition product”). In general, the internal double bond is more thermodynamically stable. The more alkyl substituents in the double bond carbon, the more stable it is. For example, in the elimination reaction that generates a double bond, this is known as the “Saytzeff rule” in which a double bond is generated so that there are many alkyl substituents on the double bond carbon. From this, it is presumed that rearrangement produces an internal double bond with many alkyl substituents on the double bond carbon. In this case, the n30 isomer is also a double bond transition.
Since the n30 isomer has more alkyl substituents on the double bond carbon, the polymerizability tends to be lower than that of the monomer before the rearrangement (n30 unsaturated (poly) alkylene glycol ether monomer). is there.
The n30 unsaturated (poly) alkylene glycol ether monomer is represented by the general formula (2), and the n30 isomer has a (poly) alkylene glycol chain represented by the general formula (3). A method for producing a polymer is also one of the preferred embodiments of the present invention.

The n30 unsaturated (poly) alkylene glycol ether monomer is preferably obtained by alkylene oxide addition of an unsaturated alcohol or an unsaturated alcohol alkylene oxide adduct. Specifically, when the n30 unsaturated (poly) alkylene glycol ether monomer is represented by the general formula (1), X—OH or X—O— (R ¹ O) a—H ( X represents an alkenyl group having 2 to 6 carbon atoms, and a is a number satisfying 30>n30> a).
As said X-OH, X is a C2-C6 alkenyl group. The alkenyl group is more preferably an alkenyl group having 3 to 5 carbon atoms, and still more preferably an alkenyl group having 4 carbon atoms. Specific examples thereof include 5-methyl-3-butenyl alcohol, 4-pentenyl alcohol, 3-pentenyl alcohol, 2-methyl-3-butenyl alcohol, 1,1-dimethyl-2-propenyl alcohol, and the like. The unsaturated alcohol having 4 carbon atoms such as unsaturated alcohol, methallyl alcohol, 3-butenyl alcohol, 2-butenyl alcohol and 1-methyl-2-butenyl alcohol is preferable. Among these, a methallyl group, an allyl group, and a 3-methyl-3-butenyl group are preferable, and a methallyl group is particularly preferable.

X—O— (R ¹ O) a—H is an alkylene oxide adduct of X—OH. The alkylene oxide addition mole number a is not particularly limited as long as it is 30>n30> a. Moreover, although a is less than 30, 1-25 are suitable, Preferably it is 1-20, More preferably, it is 1-10, More preferably, it is 1-5, More preferably, it is 1-3, Most preferably, it is 1. ~ 2, most preferably 1. When X—O (R ¹ O) a—H is used after being purified by distillation, a is preferably 10 or less, more preferably 1 to 3, further preferably 1 to 2, particularly preferably 1. In addition, when going through several steps up to the desired addition mole number n30, the unsaturated polyalkylene glycol obtained in each step can be used in the next step.

When a compound obtained by the reaction of an unsaturated halide such as X-A (where A is a halogen) and (poly) alkylene glycol is used as a starting material for obtaining the above X—OH 3, the (poly) alkylene to be reacted is used. As the glycol, (poly) alkylene glycol having a relatively small number of added moles is preferably used. Examples of X-A include allyl chloride, allyl bromide, allyl iodide, methallyl chloride, methallyl bromide, methallyl iodide, 3-methyl-3-butenyl chloride, 3-methyl-3-butenyl-bromide , 3-methyl-3-butenyl-iodide and the like. The number of added moles of (poly) alkylene glycol is preferably a relatively small number of added moles, and is less than 30. More preferably, it is 25 or less, More preferably, it is 10 or less, More preferably, it is 5 or less, More preferably, it is 3 or less, More preferably, it is 2 or less, More preferably, it is 1. Further, the oxyalkylene group in the (poly) alkylene glycol is preferably an oxyalkylene group having 2 to 18 carbon atoms, and 80 mol% or more of the oxyalkylene group is preferably an oxyethylene group, more preferably 85% mol. More preferably, it is 90% mol or more, more preferably 95% mol or more, more preferably 100% mol. Specific examples include (poly) ethylene glycol, (poly) propylene glycol, (poly) butylene glycol, (poly) ethylene glycol (poly) propylene glycol, (poly) ethylene glycol (poly) butylene glycol, and the like. . When adding 2 or more types of alkylene oxide, any form, such as block form, random form, and alternating form, may be sufficient.

Next, the n50 unsaturated (poly) alkylene glycol ether monomer will be described. The n50 unsaturated (poly) alkylene glycol ether monomer is represented by the following general formula (4):
X—O— (R ¹ O) _n50 —R ² (4)
(In the formula, X represents an alkenyl group having 2 to 6 carbon atoms, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N50 is a number of 50 or more, and is an average of oxyalkylene groups. It represents the number of added moles, and R ² is preferably a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms.

In the general formula (4), X, R ¹ O, and R ² are preferably the same as X in the general formula (1).
The average added mole number n50 of the alkylene oxide is 50 or more. The average added mole number n50 is preferably larger to some extent, and is preferably a specific value or more in the following order (a larger numerical value is preferable). That is, 50 or more, 75 or more, 100 or more, 110 or more, 120 or more, 135 or more, 150 or more are preferable. Moreover, it is also preferable that the average added mole number is not too large, and it is preferable that the average added mole number is not more than a specific value in the following order (a smaller numerical value is preferable). That is, 280 or less, 250 or less, 225 or less, and 200 or less are preferable. The smaller the average number of added moles, the lower the hydrophilicity and the lower the effect of repelling the cement particles, which may reduce the dispersion performance of the copolymer obtained. When a poly) alkylene glycol ether monomer is used for copolymerization, the copolymerization reactivity may be reduced.
Specific examples of the n50 unsaturated (poly) alkylene glycol ether monomer are preferably the same as the specific examples of the n30 unsaturated (poly) alkylene glycol ether monomer.

As the n50 unsaturated (poly) alkylene glycol ether monomer, any of those described above can be suitably used, and among them, the following general formula (5):
_{CH 2 = C (CH 3)} CH 2 -O- (R 1 O) n50 -R 2 (5)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N50 is a number of 50 or more, and represents an average number of added moles of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups are preferable.) In the above formula, R ¹ O is an oxyalkylene group having 2 to 18 carbon atoms. In the above formula, R ¹ O, n50, and R ² are preferably the same as described above.

The n50 isomer may be an isomer of the above-exemplified n50 unsaturated (poly) alkylene glycol ether monomer, but is preferably a stereoisomer, more preferably a geometric isomer. . That is, the n50 isomer is preferably a group having an unsaturated bond, an alkylene glycol moiety, and an ether bond. Specifically, the following general formula (6):
(CH ₃ ) ₂ C═CH—O— (R ¹ O) _t50 —R ² (6)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. T50 is a number of 50 or more and represents the average number of moles added of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups are preferable.) In the above formula, R ¹ O and R ² are preferably the same as those described above. The t50 is preferably in the same range as n50 described above.

In the n50 isomer, when the n50 unsaturated (poly) alkylene glycol ether monomer has a terminal double bond represented by the general formula (3), the double bond of the monomer is transferred. This produces an n50 isomer, which is thought to cause isomerization by heat. The cause of such isomerization is the same as in the case of the n30 isomer, and the characteristics such as polymerizability are also the same.
The n50 unsaturated (poly) alkylene glycol ether monomer is represented by the general formula (5), and the n50 isomer has a (poly) alkylene glycol chain represented by the general formula (6). A method for producing a polymer is also one of the preferred embodiments of the present invention.

As a preferred embodiment of the present invention, the unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of less than 30 is represented by the following general formula (2):
_{CH 2 = C (CH 3)} CH 2 -O- (R 1 O) n30 -R 2 (2)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N30 is a number of less than 30 and represents the average number of moles added of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups.)
An isomer of an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of less than 30 is represented by the following general formula (3):
(CH ₃ ) ₂ C═CH—O— (R ¹ O) _t30 —R ² (3)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. T30 is a number of less than 30 and represents the average number of moles added of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups.)
The unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of 50 or more is represented by the following general formula (5):
_{CH 2 = C (CH 3)} CH 2 -O- (R 1 O) n50 -R 2 (5)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. N50 is a number of 50 or more, and represents an average number of added moles of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. 1 to 20 hydrocarbon groups.)
An isomer of an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of 50 or more is represented by the following general formula (6):
(CH ₃ ) ₂ C═CH—O— (R ¹ O) _t50 —R ² (6)
(In the formula, R ¹ O represents an oxyalkylene group having 2 to 18 carbon atoms. T50 is a number of 50 or more, and represents an average number of added moles of the oxyalkylene group. R ² represents a hydrogen atom or a carbon number. Represents a hydrocarbon group of 1 to 20.), and is a method for producing a polymer having a (poly) alkylene glycol chain.

The n50 unsaturated (poly) alkylene glycol ether monomer is obtained by adding an alkylene oxide to an n30 unsaturated (poly) alkylene glycol ether monomer. Specifically, when the n50 unsaturated (poly) alkylene glycol ether monomer is represented by the general formula (4), the general formula (1):
X—O— (R ¹ O) _n30 —R ² (1)
It is preferable to obtain by adding an alkylene oxide to an n30 unsaturated (poly) alkylene glycol ether monomer represented by the formula:

The production method of the present invention includes a step of polymerizing essentially a monomer component containing an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of 50 or more. In this polymerization step, the essential “monomer component containing an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of 50 or more” means the n50 monomer. Means ingredients. That is, an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups that can be obtained in the above-described steps of 50 or more and its isomer are 100: 0 to 10 in mass ratio. Is a monomer component.
Hereinafter, the polymerization process will be described.
The polymerization step is a step of producing a polymer having a (poly) alkylene glycol chain by polymerizing an n50 monomer component containing an n50 unsaturated (poly) alkylene glycol-based ether monomer. Includes n50 unsaturated (poly) alkylene glycol ether monomers and n50 isomers. The monomer component other than the above two components can be appropriately selected according to the polymer having a (poly) alkylene glycol chain to be obtained, and is not particularly limited, and is an unsaturated carboxylic acid, other components described later. Etc. are suitable.
In the method for producing the polymer having the (poly) alkylene glycol chain, the monomer to be polymerized and the ratio of the monomer are selected according to the target polymer, and the reaction conditions according to the monomer are selected. It is preferable to carry out the polymerization by appropriately setting the above. For example, a process (referred to as a polymerization process) of obtaining a polycarboxylic acid copolymer by polymerizing an n50 unsaturated (poly) alkylene glycol ether monomer and an unsaturated carboxylic acid will be described.

In the polymerization step, an n50 unsaturated (poly) alkylene glycol ether monomer and an unsaturated carboxylic acid are copolymerized.
The n50 unsaturated (poly) alkylene glycol ether monomer (also referred to as monomer (i)) is obtained by the production method including the above-described alkylene oxide addition step, and is one or two kinds. The above may be used. When using 2 or more types, the combination of 2 or more types in which the average addition mole number n of an oxyalkylene group is 1-300 may be sufficient. At this time, the difference in the average added mole number n of the oxyalkylene group is preferably 10 or more, and more preferably 20 or more. For example, a combination of those having an average added mole number n of 50 to 300 and those having an average added mole number n of 1 to 50 is suitable. In this case, the difference of n is preferably 10 or more, more preferably 20 or more. Moreover, as these ratios, it is preferable that the ratio (weight ratio) of those whose average addition mole number n is 50-300 is larger than that whose average addition mole number n is 1-50. Also in the case of using three or more different monomers (i), the difference in the average added mole number n is preferably 10 or more, and more preferably 20 or more.

Examples of the unsaturated carboxylic acid (also referred to as monomer (ii)) include acrylic acid, methacrylic acid, crotonic acid, and monovalent metal salts, divalent metal salts, quaternary ammonium salts, and organic amine salts thereof. Unsaturated monocarboxylic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, citraconic acid, etc .; monovalent metal salts, divalent metal salts, ammonium salts, organic amine salts, etc. One or two or more of these can be used. Among these, acrylic acid, methacrylic acid, and maleic acid are more preferable, and acrylic acid is more preferable. That is, the unsaturated carboxylic acid preferably contains at least acrylic acid or a salt thereof. By including a structure derived from acrylic acid or a salt thereof, the resulting polycarboxylic acid copolymer can exhibit excellent dispersibility in a small amount.

In the polymerization step, other components (also referred to as monomer (iii)) may be included. Specifically, the n50 unsaturated (poly) alkylene glycol ether monomer (monomer). It may contain a monomer (copolymerizable monomer) copolymerizable with (i)) and / or an unsaturated carboxylic acid (monomer (ii)). Examples of the copolymerizable monomer include half esters and diesters of the unsaturated dicarboxylic acids and alcohols having 1 to 30 carbon atoms; and the unsaturated dicarboxylic acids and amines having 1 to 30 carbon atoms. Half amides and diamides; half esters and diesters of alkyl (poly) alkylene glycols obtained by adding 1 to 500 moles of an alkylene oxide having 2 to 18 carbon atoms to the alcohol or amine and the unsaturated dicarboxylic acids; Half esters and diesters of saturated dicarboxylic acids and glycols having 2 to 18 carbon atoms or polyalkylene glycols having an addition mole number of these glycols of 2 to 500; methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth ) Acrylate, glycidyl (meth) acryl Esters of unsaturated monocarboxylic acids such as carbonates, methyl crotonates, ethyl crotonates, and propyl crotonates with alcohols having 1 to 30 carbon atoms; alkylene having 1 to 30 carbon atoms and alkylene having 2 to 18 carbon atoms Esters of alkoxy (poly) alkylene glycol to which 1 to 500 moles of oxide are added and unsaturated monocarboxylic acids such as (meth) acrylic acid; (poly) ethylene glycol monomethacrylate, (poly) propylene glycol monomethacrylate, ( 1-500 molar adducts of alkylene oxides of 2-18 carbon atoms to unsaturated monocarboxylic acids such as (meth) acrylic acid, such as poly) butylene glycol monomethacrylate; maleamic acid and 2-18 carbon atoms Glycols or moles of these glycols added Half amides with 2 to 500 polyalkylene glycols; triethylene glycol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, (poly) ethylene glycol (poly) propylene (Poly) alkylene glycol di (meth) acrylates such as glycol di (meth) acrylate; multifunctional such as hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate ( (Meth) acrylates; (poly) alkylene glycol dimaleates such as triethylene glycol dimaleate and polyethylene glycol dimaleate; vinyl sulfonate, (meth) allyl sulfonate, 2- ( (Meth) acryloxyethyl sulfonate, 3- (meth) acryloxypropyl sulfonate, 3- (meth) acryloxy-2-hydroxypropyl sulfonate, 3- (meth) acryloxy-2-hydroxypropylsulfophenyl ether, 3- (meth) Acryloxy-2-hydroxypropyloxysulfobenzoate, 4- (meth) acryloxybutylsulfonate, (meth) acrylamide methylsulfonic acid, (meth) acrylamide ethylsulfonic acid, 2-methylpropanesulfonic acid (meth) acrylamide, styrenesulfonic acid Unsaturated sulfonic acids such as monovalent metal salts, divalent metal salts, ammonium salts, organic amine salts, etc .; unsaturated monocarboxylic acids such as methyl (meth) acrylamide and amines having 1 to 30 carbon atoms A Vinyl aromatics such as styrene, α-methylstyrene, vinyltoluene and p-methylstyrene; 1,4-butanediol mono (meth) acrylate, 1,5-pentanediol mono (meth) acrylate, 1, Alkanediol mono (meth) acrylates such as 6-hexanediol mono (meth) acrylate; dienes such as butadiene, isoprene, 2-methyl-1,3-butadiene, 2-chloro-1,3-butadiene; ) Unsaturated amides such as acrylamide, (meth) acrylalkylamide, N-methylol (meth) acrylamide, N, N-dimethyl (meth) acrylamide; Unsaturated cyanides such as (meth) acrylonitrile, α-chloroacrylonitrile; Unsaturated esters such as vinyl acetate and vinyl propionate; Unsaturated amines such as aminoethyl acrylate, methylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dibutylaminoethyl (meth) acrylate, vinylpyridine; Divinyl aromatics such as divinylbenzene; cyanurates such as triallyl cyanurate; allyls such as (meth) allyl alcohol and glycidyl (meth) allyl ether; unsaturated amino compounds such as dimethylaminoethyl (meth) acrylate; Vinyl ethers or ants such as methoxypolyethylene glycol monovinyl ether, polyethylene glycol monovinyl ether, methoxypolyethylene glycol mono (meth) allyl ether, polyethylene glycol mono (meth) allyl ether, etc. Ethers: polydimethylsiloxanepropylaminomaleamic acid, polydimethylsiloxaneaminopropylaminomaleamic acid, polydimethylsiloxane-bis- (propylaminomaleamic acid), polydimethylsiloxane-bis- (dipropyleneaminomaleamic acid) , Polydimethylsiloxane- (1-propyl-3-acrylate), polydimethylsiloxane- (1-propyl-3-methacrylate), polydimethylsiloxane-bis- (1-propyl-3-acrylate), polydimethylsiloxane-bis Siloxane derivatives such as-(1-propyl-3-methacrylate); and the like, and one or more of these can be used. In particular, as copolymerizable monomers, unsaturated such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, glycidyl (meth) acrylate, methyl crotonate, ethyl crotonate, propyl crotonate, etc. Esters of monocarboxylic acids and alcohols having 1 to 30 carbon atoms; alkoxy (poly) alkylene glycols obtained by adding 1 to 500 moles of alkylene oxides having 2 to 18 carbon atoms to alcohols having 1 to 30 carbon atoms and (meta ) Esters with unsaturated monocarboxylic acids such as acrylic acid; (poly) ethylene glycol monomethacrylate, (poly) propylene glycol monomethacrylate, (poly) butylene glycol monomethacrylate and other (meth) acrylic acid and other unsaturated mono Carbon raw materials for carboxylic acids Equimolar adducts of 1 to 500 number 2 to 18 alkylene oxide are preferred.

The other component (monomer (iii)) may also contain an unsaturated (poly) alkylene glycol diether monomer. That is, in the above production method, a monomer component containing an n50 unsaturated (poly) alkylene glycol ether monomer is polymerized to produce a polymer having a (poly) alkylene glycol chain, The production method comprises a step of polymerizing a monomer raw material containing 0.001 to 20% by mass of an unsaturated (poly) alkylene glycol diether monomer as an n50 unsaturated (poly) alkylene glycol ether monomer. A method for producing a polymer having a (poly) alkylene glycol chain containing is also one of the preferred embodiments of the present invention. Thus, by containing an unsaturated (poly) alkylene glycol diether monomer, the resulting polymer having a (poly) alkylene glycol chain has excellent properties such as cement composition dispersion performance and fluidity retention performance. And can be suitably used for various applications such as cement admixtures, inorganic pigment dispersants, and detergent builders.

The form containing the unsaturated (poly) alkylene glycol diether monomer includes (1) n50 unsaturated (poly) alkylene glycol ether monomer and unsaturated (poly) alkylene glycol diether monomer. (2) An unsaturated (poly) alkylene glycol diether monomer is contained in the reaction system by adding an unsaturated (poly) alkylene glycol diether monomer to the raw material or reaction system. The form to make is suitable, and either one may be used and both may be used together. In addition, when using n50 unsaturated (poly) alkylene glycol type | system | group ether monomer obtained by the manufacturing method mentioned above as a raw material, it will contain unsaturated (poly) alkylene glycol type | system | group diether monomer as a by-product. Therefore, the form (1) can simplify the manufacturing process and is advantageous in terms of the manufacturing process.
As a form of the above (1), an unsaturated (poly) alkylene glycol diether monomer in the raw material is 0.001 to 20 per 100 parts of n50 unsaturated (poly) alkylene glycol ether monomer. A part-containing form is preferred. In this case, when obtaining an n50 unsaturated (poly) alkylene glycol ether monomer, it is preferable to use a production method or production raw material that contains an unsaturated (poly) alkylene glycol diether monomer. The n50 unsaturated (poly) alkylene glycol ether monomer obtained by the above production method can be used as a raw material and is useful as a raw material. Thus, it is a preferable embodiment that the unsaturated (poly) alkylene glycol diether monomer is present in the raw material as a by-product. That is, a method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an n50 unsaturated (poly) alkylene glycol ether monomer, the production method comprising: (Poly) alkylene glycol comprising a step of polymerizing using a monomer raw material containing 0.001 to 20% by mass of an unsaturated (poly) alkylene glycol diether monomer as a saturated (poly) alkylene glycol ether monomer A method for producing a polymer having a chain is also one of the preferred embodiments of the present invention.

As said monomer raw material, it is suitable to contain 0.001-20 mass% of unsaturated (poly) alkylene glycol diether monomers. If it is less than 0.001% by mass, the resulting polymer having a (poly) alkylene glycol chain may not be sufficiently excellent in cement composition dispersion performance, fluidity retention performance, etc., and 20% by mass When it exceeds, there exists a possibility that the cement composition dispersibility may fall. The content of the unsaturated (poly) alkylene glycol diether monomer is preferably 0.0025 to 15% by mass and more preferably 0.005 to 10% with respect to 100% by mass of the monomer raw material. It is 0.01 mass%, More preferably, it is 0.01-5 mass%, Most preferably, it is 0.015-3 mass%.

The unsaturated (poly) alkylene glycol diether monomer has an unsaturated bond group, an alkylene glycol moiety, and a diether bond. As such an unsaturated (poly) alkylene glycol diether monomer, a form in which an unsaturated bond group and an alkylene glycol moiety are bonded by an ether bond is preferable. More preferably, the group having two unsaturated bonds is bonded to the alkylene glycol moiety with an ether bond. Specifically, the unsaturated (poly) alkylene glycol diether monomer has the following general formula (7):
_{^{X-O- (R 2 O)}} m -Y (7)
(In the formula, X and Y are the same or different and represent an alkenyl group having 2 to 6 carbon atoms. R ² O represents an oxyalkylene group having 2 to 18 carbon atoms. M is an average of oxyalkylene groups. The number of moles added is a number of 1 to 300.) X and Y are the same or different and are preferably the same as X described above.

R ² O is an oxyalkylene group having 2 to 18 carbon atoms, preferably an oxyalkylene group having 2 to 8 carbon atoms, and more preferably an oxyalkylene group having 2 to 4 carbon atoms. Specifically, one or more of an oxyethylene group, an oxypropylene group, an oxybutylene group, an oxystyrene group, and the like are preferable, and among them, an oxyethylene group is preferable. When two or more oxyalkylene groups are present, the oxyethylene group is preferably 80 mol% or more. Thereby, it becomes an unsaturated (poly) alkylene glycol diether monomer which maintains the balance between hydrophilicity and hydrophobicity and exhibits excellent dispersion performance. When it is less than 80 mol%, when the obtained polycarboxylic acid copolymer is used as, for example, a cement admixture, sufficient dispersibility may not be exhibited. More preferably, it is 85 mol% or more, still more preferably 90 mol% or more, particularly preferably 95 mol% or more, and most preferably 100 mol%.
When two or more kinds of oxyalkylene groups are present, they may be present in any form such as block, random or alternating.

The average added mole number m of the alkylene oxide to be added is suitably 1 to 300. The average added mole number is preferably in the range of specific values in the following order. That is, 1-200, 1-100, 1-50, 1-25, 1-10, 1-5, 1-3, 1-2 are preferable, and 1 is most preferable. If the average number of added moles exceeds 300, the copolymerizability may decrease and the dispersibility may decrease. When m is 2 or more, R ² O may be the same or different.

Specific examples of the unsaturated (poly) alkylene glycol diether monomer include (poly) alkylene glycol dimethallyl ether, (poly) alkylene glycol diallyl ether, and (poly) alkylene glycol di-3-methyl-3-butyl. Tenyl ether is preferred. More preferred are (poly) ethylene glycol dimethallyl ether, (poly) ethylene glycol diallyl ether, and (poly) ethylene glycol di-3-methyl-3-butenyl ether, and still more preferred are diethylene glycol dimethallyl ether and diethylene glycol diallyl ether. Diethylene glycol di-3-methyl-3-butenyl ether, ethylene glycol dimethallyl ether, ethylene glycol diallyl ether, ethylene glycol di-3-methyl-3-butenyl ether.

The blending ratio of the monomers (i) to (iii) is n50 unsaturated (poly) alkylene glycol ether monomer (monomer (i)), unsaturated carboxylic acid (monomer (ii) ) And other components (monomer (iii)) added as necessary, the total content is preferably within the following range.
The blending ratio of the monomer (i) is preferably 1% by mass or more. When the blending ratio is less than 1% by mass, when the resulting polycarboxylic acid copolymer is used as a cement admixture, the dispersibility with respect to cement tends to be reduced. More preferably, it is 10 mass% or more, More preferably, it is 20 mass% or more, Most preferably, it is 30 mass% or more, Most preferably, it is 45 mass% or more.

The upper limit of the proportion of monomer (ii) is suitably 60% by mass or less in terms of sodium salt. When the amount exceeds 60% by mass, when the resulting polycarboxylic acid copolymer is used as a cement admixture, the dispersion performance deteriorates with time (slump loss), and sufficient dispersion performance may not be exhibited. Preferably, it is 50% by mass or less, more preferably 40% by mass or less, further preferably 35% by mass or less, particularly preferably 30% by mass or less, and most preferably 25% by mass or less. Moreover, it is preferable that it is below a specific value in the following order (a smaller numerical value is preferable). It is more preferable in this order that they are 20 mass% or less, 15 mass% or less, and 10 mass% or less. Moreover, as a minimum of the mixture ratio of monomer (ii), it is preferable that it is 1 mass% or more. More preferably, it is 2 mass% or more, More preferably, it is 3 mass% or more, Most preferably, it is 4 mass% or more.

The blending ratio of the monomer (iii) is not particularly limited as long as it does not impair the effects of the present invention, but is preferably 70% by mass or less, more preferably 60% by mass or less in the polymerization step. More preferably, it is 50% by mass or less, particularly preferably 40% by mass or less, and most preferably 30% by mass or less. Moreover, it is preferable that it is below a specific value in the following order (it is preferable that a numerical value is smaller), and it is more preferable in this order that it is 20 mass% or less and 10 mass% or less.

The blending ratio of each component in the polymerization step is, for example, monomer (i) / monomer (ii) / monomer (iii) = 1 to 99/1 to 60/0 to 70 (mass%). A range is preferred. More preferably, monomer (i) / monomer (ii) / monomer (iii) = 5 to 99/1 to 50/0 to 60 (mass%), and more preferably 10 to 99. / 1 to 40/0 to 50 (mass%), particularly preferably 25 to 98/2 to 35/0 to 40 (mass%), and most preferably 40 to 97/3 to 30/0. It is -30 (mass%), Most preferably, it is 45-97 / 3-25 / 0-30. (However, the sum of monomer (i), monomer (ii) and monomer (iii) is 100% by mass).

Copolymerization for obtaining the polycarboxylic acid copolymer can be carried out by a known method such as solution polymerization or bulk polymerization. The solution polymerization can be carried out either batchwise or continuously. Solvents used here include water; alcohols such as methyl alcohol, ethyl alcohol and isopropyl alcohol; benzene, toluene, xylene, cyclohexane, n-hexane and the like. Aromatic or aliphatic hydrocarbons of the above; ester compounds such as ethyl acetate; ketone compounds such as acetone and methyl ethyl ketone; cyclic ether compounds such as tetrahydrofuran and dioxane; and the like. From the viewpoint of solubility, it is preferable to use at least one selected from the group consisting of water and a lower alcohol having 1 to 4 carbon atoms. Among them, it is more preferable to use water as a solvent because the solvent removal step can be omitted. .

When aqueous solution polymerization is performed, a water-soluble polymerization initiator, for example, a persulfate such as ammonium persulfate, sodium persulfate, or potassium persulfate; hydrogen peroxide; 2,2′-azobis-2 -Azoamidine compounds such as methylpropionamidine hydrochloride, cyclic azoamidine compounds such as 2,2'-azobis-2- (2-imidazolin-2-yl) propane hydrochloride, and azonitrile compounds such as 2-carbamoylazoisobutyronitrile Water-soluble azo-based initiators such as sodium bisulfite are used. In this case, Fe (II) salts such as alkali metal sulfites such as sodium hydrogen sulfite, metabisulfites, sodium hypophosphite, and molle salts, hydroxymethanesulfinic acid Sodium dihydrate, hydroxylamine hydrochloride, thiourea, L-ascorbic acid (salt), erythorbium Accelerators such as acid (salt) can also be used in combination. Among these, a combination of hydrogen peroxide and an accelerator such as L-ascorbic acid (salt) is preferable.

For solution polymerization using a lower alcohol, aromatic or aliphatic hydrocarbon, ester compound or ketone compound as a solvent, peroxides such as benzoyl peroxide, lauroyl peroxide, sodium peroxide; t-butyl hydroperoxide, cumene hydro Hydroperoxides such as peroxides; azo compounds such as azobisisobutyronitrile; etc. are used as radical polymerization initiators. In this case, an accelerator such as an amine compound can be used in combination. Furthermore, when a water-lower alcohol mixed solvent is used, it can be appropriately selected from the above-mentioned various radical polymerization initiators or combinations of radical polymerization initiators and accelerators.

When performing bulk polymerization, as a radical polymerization initiator, peroxides such as benzoyl peroxide, lauroyl peroxide and sodium peroxide; hydroperoxides such as t-butyl hydroperoxide and cumene hydroperoxide; azobisisobutyro An azo compound such as nitrile is used.

The reaction temperature at the time of copolymerization is not particularly limited. For example, when persulfate is used as an initiator, the reaction temperature is suitably in the range of 30 to 100 ° C, preferably in the range of 40 to 95 ° C, The range of 45-90 degreeC is further more preferable. When the initiator is a combination of hydrogen peroxide and L-ascorbic acid (salt) as an accelerator, the reaction temperature is suitably in the range of 30 to 100 ° C, preferably in the range of 40 to 95 ° C, 45 A range of ˜90 ° C. is more preferable.
The polymerization time during the copolymerization is not particularly limited, but for example, a range of 0.5 to 10 hours is appropriate, preferably 0.5 to 8 hours, and more preferably 1 to 6 hours. If the polymerization time is too long or too short from this range, the polymerization rate is lowered and the productivity is lowered, which is not preferable.
The amount of all monomer components used in the copolymerization is suitably in the range of 10 to 99% by mass, preferably in the range of 20 to 98% by mass, based on the total raw materials including other raw materials and the polymerization solvent. The range of 25-95 mass% is more preferable, the range of 30-90 mass% is further more preferable, the range of 30-80 mass% is especially preferable, and the range of 40-70 mass% is the most preferable. In particular, if the amount of all the monomer components used is too lower than this range, it is not preferable because the polymerization rate is lowered and the productivity is lowered.

The method of charging each monomer into the reaction vessel is not particularly limited, the method of initially charging the entire amount into the reaction vessel at once, the method of dividing or continuously charging the entire amount into the reaction vessel, and the initial charging into the reaction vessel. Any method may be employed in which the remainder is divided or continuously charged into the reaction vessel. Specifically, a method in which the total amount of monomer (i) and the total amount of monomer (ii) are continuously charged into the reaction vessel, a part of monomer (i) is initially charged into the reaction vessel, and A method of continuously charging the remainder of the monomer (i) and the whole amount of the monomer (ii) into the reaction vessel, or a part of the monomer (i) and a part of the monomer (ii) in the reaction vessel A method in which the remainder of monomer (i) and the remainder of monomer (ii) are alternately fed into the reaction vessel in several divided portions, and the entire amount of monomer (i) is added to the reaction vessel. First, the whole amount of monomer (ii) is continuously or dividedly charged into the reaction vessel, and the whole amount of monomer (i) and a part of monomer (ii) are initially charged into the reaction vessel. And the remaining monomer (ii) can be continuously or dividedly charged into the reaction vessel. Furthermore, by changing the charging rate of each monomer into the reaction vessel in the middle of the reaction continuously or stepwise, changing the weight ratio of each monomer per unit time continuously or stepwise, Two or more types of copolymers having different ratios of the structural unit (I) derived from the monomer (i) and the structural unit (II) derived from the monomer (ii) are synthesized simultaneously during the polymerization reaction. Also good. The radical polymerization initiator may be charged into the reaction vessel from the beginning, may be dropped into the reaction vessel, or may be combined according to the purpose.

In the case of copolymerization, a chain transfer agent can be used for adjusting the molecular weight of the obtained copolymer. In particular, a chain transfer agent is preferably used when the polymerization reaction is performed at a high concentration in which the amount of all monomer components used is 30% by mass or more based on the total amount of raw materials used during polymerization. Examples of chain transfer agents include mercaptoethanol, thioglycerol, thioglycolic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, thiomalic acid, octyl thioglycolate, octyl 3-mercaptopropionate, 2-mercaptoethanesulfonic acid, etc. These thiol chain transfer agents can be used, and two or more types of chain transfer agents can be used in combination. Furthermore, in order to adjust the molecular weight of the copolymer, it is also effective to use a monomer having a high chain transfer property such as (meth) allylsulfonic acid (salt) as the monomer (iii).

In order to obtain a copolymer having a predetermined molecular weight with good reproducibility, it is important to allow the copolymerization reaction to proceed stably. Therefore, when performing solution polymerization, the dissolved oxygen concentration at 25 ° C. of the solvent to be used is set. It is preferable to be 5 ppm or less. More preferably, the range is 0.01 to 4 ppm, still more preferably 0.01 to 2 ppm, and most preferably 0.01 to 1 ppm. In addition, what is necessary is just to make the dissolved oxygen concentration of the type | system | group containing a monomer into the said range, when nitrogen substitution etc. are performed after adding a monomer to a solvent.
The dissolved oxygen concentration of the solvent may be adjusted in a polymerization reaction tank, or a solvent whose dissolved oxygen amount is adjusted in advance may be used. Examples of the method for driving off oxygen in the solvent include the following methods (1) to (5).

(1) After pressurizing and filling an inert gas such as nitrogen into a sealed container containing a solvent, the oxygen partial pressure in the solvent is lowered by lowering the pressure in the sealed container. You may reduce the pressure in an airtight container under nitrogen stream.
(2) The liquid phase portion is vigorously stirred for a long time while the gas phase portion in the container containing the solvent is replaced with an inert gas such as nitrogen.
(3) An inert gas such as nitrogen is bubbled in a solvent placed in the container for a long time.
(4) The solvent is once boiled and then cooled in an inert gas atmosphere such as nitrogen.
(5) A static mixer (static mixer) is installed in the middle of the pipe, and an inert gas such as nitrogen is mixed in the pipe for transferring the solvent to the polymerization reaction tank.

In the above copolymerization reaction, when a solvent is used, the polymerization may be carried out at a pH of 5 or more. It is preferable to carry out the copolymerization reaction at a pH of less than 5. The pH can be adjusted by, for example, inorganic salts such as monovalent metal or divalent metal hydroxides and carbonates; alkaline substances such as ammonia; organic amines; inorganic acids such as hydrochloric acid, phosphoric acid and sulfuric acid, acetic acid It can be carried out using organic acids such as paratoluenesulfonic acid.

In the present invention, a method for producing a polymer having a polyalkylene glycol chain by polymerizing a monomer component containing an unsaturated polyalkylene glycol ether monomer,
The manufacturing method is as follows:
An unsaturated alcohol or unsaturated (poly) alkylene glycol ether monomer is reacted with an alkylene oxide, and the resulting unsaturated polyalkylene glycol ether monomer (M1- 1) A process for producing an unsaturated polyalkylene glycol ether monomer mixture (M1) containing 0 to 2 parts of an isomer (M1-2) of an unsaturated polyalkylene glycol ether monomer with respect to 100 parts. 1 and
The unsaturated polyalkylene glycol ether monomer mixture (M1) is further reacted with an alkylene oxide, and the resulting unsaturated polyalkylene glycol ether monomer (M2- 1) A step of producing an unsaturated polyalkylene glycol ether monomer mixture (M2) containing 0 to 10 parts of an isomer (M2-2) of an unsaturated polyalkylene glycol ether monomer with respect to 100 parts. 2 and
A method for producing a polymer comprising the step 3 of polymerizing under a condition containing an unsaturated polyalkylene glycol ether monomer mixture (M2) is also one of preferred embodiments.

FIG. 1 is a schematic diagram showing one preferred embodiment of the method for producing a polymer having a (poly) alkylene glycol chain of the present invention. In FIG. 1, an n50 monomer component containing the n50 unsaturated (poly) alkylene glycol ether monomer is obtained by an addition reaction, and the n50 unsaturated (poly) alkylene glycol ether monomer is polymerized. The process for producing a polymer having a (poly) alkylene glycol chain is shown. Specifically, methallyl alcohol and methallyl alcohol adducts of less than 30 moles of ethylene oxide (unsaturated (poly) ethylene glycol ethers having shorter oxyethylene groups than n30 unsaturated (poly) ethylene glycol ether monomers) A step of obtaining an n30 monomer component containing an n30 unsaturated (poly) alkylene glycol ether monomer by adding ethylene oxide to the monomer (step 1), and the product obtained in step 1 (n30 monomer) Obtained by an addition step (step 2) of adding ethylene oxide to the body component) to obtain an n50 monomer component (including an n50 unsaturated (poly) ethylene glycol ether monomer and an n50 isomer). N50 monomer component containing methallyl alcohol ethylene oxide adduct and isomer (n50 unsaturated (poly) The Ruki containing alkylene glycol ether monomer and n50 isomers), an unsaturated carboxylic acid copolymerized with a polymerization process is described. In FIG. 1, the additional process is performed in two stages, but may be performed in one stage as described above, or may be performed in multiple stages.

The present invention is also a method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly) alkylene glycol ether monomer, the production method comprising: And a step of polymerizing a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of less than 30 and its isomer is 100: 0 to 2 in mass ratio. It is also a method for producing a polymer having a (poly) alkylene glycol chain.
By using such a production method, a polymer having a (poly) alkylene glycol chain having a short oxyalkylene group length can be obtained, and a polymer having an alkylene glycol chain having a short oxyalkylene group length is used as a cement. There is an advantage that the fluidity retention performance of the composition is excellent.
In the above production method, an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups of less than 30 (n30 unsaturated (poly) alkylene glycol ether monomer), an isomer thereof (n30 Isomers), monomer components containing these (n30 monomer components) and the like are preferably the same as described above. In the description of the polymerization step, “n50 unsaturated (poly) alkylene glycol ether monomer”, “n50 isomer” and “n50 monomer component” are respectively “n30 unsaturated (poly) alkylene glycol type”. The same as above except that it becomes an “ether monomer”, “n30 isomer”, and “n30 monomer component”.

The present invention is also a polymer having a (poly) alkylene glycol chain obtained by the above production method. Hereinafter, a polycarboxylic acid copolymer will be described as a preferred example of a polymer having a (poly) alkylene glycol chain. However, in a polymer other than the polycarboxylic acid copolymer, the constituent components of the polymer are also described. It can be appropriately selected and applied to various polymers. The ratio of each structural unit constituting the polycarboxylic acid copolymer is preferably the same as the blending ratio of the monomer.

The polycarboxylic acid-based copolymer preferably has a number of milliequivalents of carboxyl groups when all the carboxyl groups of the copolymer are converted to an unneutralized type, and is 5.50 meq or less per gram of copolymer. More preferably 0.10 to 5.50 meq / g, still more preferably 0.15 to 4.00 meq / g, particularly preferably 0.20 to 3.50 meq / g, most preferably 0.30 to 3.00 meq / g. The range of g is good.
The number of milliequivalents of carboxyl groups when all the carboxyl groups in the polycarboxylic acid copolymer are converted to an unneutralized type can be calculated as follows. For example, acrylic acid is used as the unsaturated carboxylic acid, and n50 unsaturated (poly) alkylene glycol ether monomer (monomer (i)) / unsaturated carboxylic acid (monomer (ii)) = 90/10 When copolymerized at a composition ratio of (% by mass), the molecular weight of acrylic acid is 72, and the number of milliequivalents of carboxyl groups per gram of copolymer is (0.1 / 72) × 1000 = 1.39 ( meq / g) (calculation example 1). For example, when sodium acrylate is used as the monomer (ii) and copolymerization is performed at a composition ratio of monomer (i) / monomer (ii) = 90/10 (mass%), sodium acrylate The molecular weight of acrylic acid is 94, and the molecular weight of acrylic acid is 72. Therefore, the number of milliequivalents of carboxyl groups per 1 g of copolymer is (0.1 / 94) / (0.9 + 0.1 × 72/94) × 1000 = 1.09 (meq / g) (calculation example 2). In addition, when acrylic acid is used at the time of polymerization and the carboxyl group derived from acrylic acid is neutralized with sodium hydroxide after polymerization, the calculation can be performed in the same manner as in Calculation Example 2. Further, for example, sodium methacrylate and sodium acrylate are used as the monomer (ii), and the monomer (i) / sodium methacrylate / sodium acrylate = 90/5/5 (mass%) When polymerized, the molecular weight of methacrylic acid is 86, the molecular weight of sodium methacrylate is 108, the molecular weight of acrylic acid is 72, and the molecular weight of sodium acrylate is 94. (0.05 / 108 + 0.05 / 94) / (0.9 + 0.05 × 86/108 + 0.05 × 72/94) × 1000 = 1.02 (meq / g) (Calculation Example 3).

The present invention is also a cement admixture using the above polymer. The said polymer is a polymer which has the (poly) alkylene glycol chain mentioned above, and is suitably obtained with a manufacturing method. As described above, the polymer having the (poly) alkylene glycol chain is preferably a polycarboxylic acid copolymer. Hereinafter, as a suitable example of a polymer having a (poly) alkylene glycol chain, a polycarboxylic acid-based copolymer will be described. In a polymer having a (poly) alkylene glycol chain other than the polycarboxylic acid-based copolymer, It can be suitably applied.
The polycarboxylic acid copolymer of the present invention is particularly preferably used as a cement admixture or a concrete admixture. Thus, a cement admixture containing the polycarboxylic acid copolymer is also one of the preferred embodiments of the present invention.
When the cement admixture contains the above-described polycarboxylic acid copolymer, the cement admixture can exhibit excellent effects such as dispersion performance, slump retention performance, mortar and concrete durability improvement. In addition, the cement composition comprising the above cement admixture, cement and water as essential components has a viscosity (workability, e.g., ease of kneading when kneading mortar and scoop work in concrete) and fluidity ( Both ease of flow when poured) can be demonstrated. The technical correlation between the “flow value” (fluidity) indicating the physical properties of the cement composition and the “concrete state” (viscosity) is at least not clear at present, but these phenomena, for example, For example, when comparing candy candy and yogurt, candy candy is sticky, so if you try to stir it with a spoon, you need a lot of force (high viscosity and poor workability), but on a flat surface. When placed, it flows and spreads thinly. On the other hand, when trying to stir yogurt with a spoon, it can be easily stirred (low viscosity and good workability), but it does not flow and spread even when placed on a flat surface.

The polycarboxylic acid-based copolymer can be used as it is as a main component of a cement admixture, but it is preferable to adjust the pH to 5 or more from the viewpoint of handleability. As described above, the copolymerization reaction is preferably performed at a pH of less than 5, and the pH is preferably adjusted to 5 or more after the copolymerization. The pH can be adjusted using, for example, an alkaline substance such as an inorganic salt such as a monovalent metal or divalent metal hydroxide or carbonate; ammonia; an organic amine; Further, after the reaction is completed, the concentration can be adjusted if necessary. The polycarboxylic acid copolymer may be used as a main component of the cement admixture as it is in the form of an aqueous solution, or may be neutralized with a hydroxide of a divalent metal such as calcium or magnesium. It may be used after being made into a polyvalent metal salt and then dried, or supported on an inorganic powder such as silica fine powder and dried.

The cement admixture essentially comprises the polycarboxylic acid copolymer. The content of the polycarboxylic acid copolymer in the cement admixture is not particularly limited, but is preferably 20% by mass or more, preferably 40% by mass or more of the solid content in the cement admixture, that is, the non-volatile content. More preferably.
In the present invention, the following method is suitable as a method for measuring the solid content of the cement admixture.
(Solid content measurement method)
1. Weigh the aluminum dish.
The solid content to be measured is precisely weighed on the aluminum dish precisely weighed in 2.1.
3. A solid content measurement product precisely weighed in 2 is placed in a dryer adjusted to 130 ° C. in a nitrogen atmosphere for 1 hour.
4. After 1 hour, remove from the dryer and allow to cool in a desiccator at room temperature for 15 minutes.
5. After 15 minutes, remove from the desiccator and precisely weigh the aluminum dish and the measurement object.
The mass of the aluminum dish obtained in 1 is subtracted from the mass obtained in 6.5, and the solid content is measured by dividing the mass of the fixed part obtained in 2.
The cement admixture may be a combination of two or more copolymers. For example, a combination of two or more copolymers having different ratios of the structural unit (I) derived from the monomer (i) and the structural unit (II) derived from the monomer (ii) A combination of two or more kinds of copolymers having different average added mole numbers of the oxyalkylene group of the structural unit (I) introduced by i) is possible.

It is preferable that the cement admixture contains 1 to 50% by mass of polyalkylene glycol with respect to the copolymer in addition to the polycarboxylic acid copolymer. More preferably, it is 2-50 mass%, More preferably, it is 2-40 mass%, Most preferably, it is good to contain 3-30 mass%. By containing polyalkylene glycol, it becomes a dispersant that can further improve the workability of mortar and concrete. When the content of polyalkylene glycol is less than 1% by mass, the workability improvement effect of mortar and concrete becomes insufficient, while when it exceeds 50% by mass, dispersibility with respect to cement is lowered, which is not preferable.

As the polyalkylene glycol, those having an oxyalkylene group having 2 to 18 carbon atoms are suitable, preferably an oxyalkylene group having 2 to 8 carbon atoms, more preferably 2 to 4 carbon atoms. Is good. Furthermore, since the polyalkylene glycol needs to be water-soluble, it is preferable to have at least an oxyalkylene group having a high hydrophilicity, ie, an oxyethylene group having 2 carbon atoms, that is, an oxyethylene group of 90 mol% or more. More preferably, it contains an ethylene group. The repeating unit of the oxyalkylene group may be the same or different. When the oxyalkylene group is in the form of a mixture of two or more, block addition, random addition, alternating addition Any of these additional forms may be used. The terminal group of the polyalkylene glycol is suitably a hydrogen atom, an alkyl group having 1 to 30 carbon atoms or a (alkyl) phenyl group, but a hydrogen atom is preferred. The average molecular weight of the polyalkylene glycol is preferably in the range of 500 to 200,000, more preferably in the range of 1000 to 100,000, and still more preferably in the range of 2000 to 50000.

Specific examples of the polyalkylene glycol include polyethylene glycol, polypropylene glycol, polyethylene polypropylene glycol, and polyethylene polybutylene glycol. The polyalkylene glycol is hydrophilic because it needs to be water-soluble. Polyethylene glycol or polyethylene polypropylene glycol containing a high oxyethylene group as an essential component is preferred, and polyethylene glycol is most preferred.

The cement admixture containing the above polyalkylene glycol, for example, does not remove the polyalkylene glycol produced as an impurity in the addition step, and is an n50 unsaturated (poly) alkylene glycol ether monomer (monomer (i)). In addition, it is preferably obtained by using it in the polymerization step. Thus, by using n50 unsaturated (poly) alkylene glycol ether (monomer (i)) containing polyalkylene glycol as an impurity as a monomer component, the above cement admixture containing polyalkylene glycol can be easily prepared. Can get to. The monomer (i) is also preferably obtained by adding an alkylene oxide to an alcohol having an unsaturated bond as described above. Examples of such an unsaturated alcohol are as described above. For example, an alcohol having an unsaturated bond (unsaturated alcohols) such as methallyl alcohol, 3-buten-1-ol, and allyl alcohol may be substituted with an alkylene oxide. It is preferable to obtain also by adding. In such an addition reaction, a compound having an active hydrogen such as saturated aliphatic alcohols (methanol, ethanol, etc.) other than the alcohol having the unsaturated bond (unsaturated alcohols) and water is present in the reaction system. In addition to the desired unsaturated (poly) alkylene glycol ether monomer, polyalkylene glycol may be by-produced. By removing the by-produced polyalkylene glycol and using the product obtained by the addition reaction as a raw material as it is, the purification process can be simplified, and the obtained cement admixture is a copolymer. And polyalkylene glycol, and the workability of mortar and concrete before curing can be further improved.

The content of polyalkylene glycol contained as an impurity is suitably 0.5 to 50% by mass, preferably 1 to 40% by mass, based on the n50 unsaturated (poly) alkylene glycol ether monomer. -30 mass% is more preferable, and 3-20 mass% is further more preferable. When the proportion of the polyalkylene glycol exceeds 50% by mass, the amount of use as a cement admixture increases because the dispersion performance of the polyalkylene glycol itself is low, which is not preferable.

The cement admixture contains 1 to 100% by mass of the n50 unsaturated (poly) alkylene glycol ether (monomer (i)) in addition to the polycarboxylic acid copolymer. Is preferred. More preferably, it is 2-100 mass%, More preferably, it is 3-90 mass%, Most preferably, it is good to contain 5-80 mass%. By containing the monomer (i), it becomes a dispersant that can further improve the workability of mortar and concrete. If the content of monomer (i) is less than 1% by mass, the workability improvement effect of mortar and concrete will be insufficient, while if it exceeds 100% by mass, the dispersibility to cement will decrease. It is not preferable.

Such a cement admixture that also contains the monomer (i) is used in the polymer in which the unreacted monomer (i) is produced at the time of copolymerization when the polycarboxylic acid copolymer is obtained. On the other hand, it can be easily obtained by stopping the polymerization reaction at a point of 1 to 100% by mass. Thereby, the obtained product contains the monomer (i) in addition to the copolymer, and can exhibit excellent dispersion performance. The time point at which the polymerization reaction is stopped is preferably when the monomer (i) is 2 to 80% by mass, more preferably 3 to 70% by mass, and still more preferably, with respect to the polymer. Is preferably 5 to 60% by mass. When the polymerization reaction is stopped when the amount of the unreacted monomer (i) is less than 1% by mass with respect to the produced polymer, the resulting cement admixture is insufficient in improving the workability of mortar and concrete. On the other hand, when the polymerization reaction is stopped at a point exceeding 100% by mass, the dispersibility with respect to cement is lowered.

The most preferable form of the cement admixture is one containing both the polyalkylene glycol and the monomer (i) in the above ratio. By containing both of these components, the dispersant becomes extremely excellent in workability of mortar and concrete.

The cement admixture can be used for various hydraulic materials, that is, hydraulic materials other than cement, such as cement and gypsum. And as a concrete example of a hydraulic composition containing a hydraulic material, water and the above cement admixture, and further containing fine aggregate (sand, etc.) and coarse aggregate (crushed stone, etc.) Examples include paste, mortar, concrete, plaster and the like.

Among the hydraulic compositions exemplified above, a cement composition using cement as a hydraulic material is the most common, and a cement composition comprising the cement admixture, cement and water as essential components is also used. This is one of the preferred embodiments of the present invention.

There is no limitation in particular as a cement used in the said cement composition. For example, Portland cement (ordinary, early strength, very early strength, moderate heat, sulfate resistance and low alkali type of each), various mixed cements (blast furnace cement, silica cement, fly ash cement), white Portland cement, alumina cement, Super fast cement (1 clinker fast cement, 2 clinker fast cement, magnesium phosphate cement), grout cement, oil well cement, low exothermic cement (low exothermic blast furnace cement, fly ash mixed low exothermic blast furnace cement, belite High-concentration cement), ultra-high-strength cement, cement-based solidified material, eco-cement (city waste incineration ash, sewage sludge incineration ash as a raw material), blast furnace slag, fly ash , Cinder ash, clinker ash Husk ash, silica fume, silica powder, a fine powder and gypsum limestone powder may be added. In addition to gravel, crushed stone, granulated slag, recycled aggregate, etc., as aggregate, siliceous, clay, zircon, high alumina, silicon carbide, graphite, chromium, chromic, magnesia, etc. The refractory aggregate can be used.

In the cement composition, there is no particular limitation on the unit water amount per 1 m ³ , the cement use amount and the water / cement ratio, and the unit water amount is 100 to 185 kg / m ³ , the cement amount used is 250 to 800 kg / m ³ , Water / cement ratio (weight ratio) = 0.1 to 0.7, preferably unit water amount 120 to 175 kg / m ³ , used cement amount 270 to 800 kg / m ³ , water / cement ratio (weight ratio) = 0.15 ~ 0.65 is recommended. As described above, the cement composition of the present invention can be widely used from poor blending to rich blending, and can be used for both high-strength concrete with a large amount of unit cement and poor blended concrete with a unit cement amount of 300 kg / m ³ or less. It is valid. In addition, the cement composition of the present invention has a relatively high water reduction rate, that is, water / cement ratio (weight ratio) = 0.15 to 0.5 (preferably 0.15 to 0.4). Even in a low cement ratio region, it can be used satisfactorily.

The blending ratio of the cement admixture in the cement composition of the present invention is not particularly limited, but when used for mortar or concrete using hydraulic cement, 0.01 to 10% by mass of cement weight, An amount of a ratio of preferably 0.02 to 5% by mass, more preferably 0.05 to 3% by mass may be added. By this addition, various preferable effects such as reduction in unit water amount, increase in strength, and improvement in durability are brought about. When the above blending ratio is less than 0.01% by mass, the performance is insufficient. On the contrary, even if a large amount exceeding 10% by mass is used, the effect is practically peaked and disadvantageous from the economical aspect.

The above-mentioned cement composition is effective for concrete for concrete secondary products, concrete for centrifugal molding, concrete for vibration compaction, steam-cured concrete, sprayed concrete, and the like, and also has high fluidity concrete, self-filling concrete, self It is also effective for mortar and concrete that require high fluidity such as leveling materials.

The cement composition may contain a known cement admixture. Known cement admixtures that can be used are not particularly limited, and various sulfonic acid-based dispersants having a sulfonic acid group in the molecule, and various polycarboxylic acid-based compounds having a polyoxyalkylene chain and a carboxyl group in the molecule. A dispersing agent is mentioned. Examples of the sulfonic acid dispersant include lignin sulfonate; polyol derivative; naphthalene sulfonic acid formalin condensate; melamine sulfonic acid formalin condensate; polystyrene sulfonate; aminoaryl sulfonic acid-phenol-formaldehyde condensate and the like. A sulfonic acid type | system | group etc. are mentioned. Examples of the polycarboxylic acid-based dispersant include a polyalkylene glycol mono (meth) acrylate ester having a polyoxyalkylene chain in which an alkylene oxide having 2 to 18 carbon atoms is added in an average addition mole number of 2 to 300. A copolymer obtained by copolymerizing a monomer component containing a monomer and a (meth) acrylic acid monomer as essential components; an alkylene oxide having 2 to 3 carbon atoms in an average addition mole number of 2 to 300 The essential component is a polyalkylene glycol mono (meth) acrylate monomer having an added polyoxyalkylene chain, a (meth) acrylic acid monomer and a (meth) acrylic acid alkyl ester. A copolymer obtained by copolymerizing monomer components contained as poly; a polysiloxane having 2 to 300 additions of an average number of moles of alkylene oxide having 2 to 3 carbon atoms; Polyalkylene glycol mono (meth) acrylic acid ester monomer having a xyalkylene chain, (meth) acrylic acid monomer and (meth) allylsulfonic acid (salt) (or vinylsulfonic acid (salt) or p- (Meth) allyloxybenzenesulfonic acid (any of salts)), a copolymer obtained by copolymerizing a monomer component containing three types of monomers as essential components; 3 types of single quantities of polyalkylene glycol mono (meth) acrylate ester monomer having added polyoxyalkylene chain, (meth) acrylic acid monomer and (meth) allylsulfonic acid (salt) (Meth) acrylamide and / or 2- (meth) acrylamide-2-methyl further to a copolymer obtained by copolymerizing a monomer component containing an isomer as an essential component A copolymer obtained by graft polymerization of lopansulfonic acid; a polyethylene glycol mono (meth) acrylic acid ester monomer having a polyoxyalkylene chain in which ethylene oxide is added in an average addition mole number of 5 to 50 and ethylene oxide in an average addition mole number of 1 Polyethylene glycol mono (meth) allyl ether monomer having added polyoxyalkylene chain, (meth) acrylic acid monomer and (meth) allylsulfonic acid (salt) (or p- (meth) allyl) Copolymer obtained by copolymerizing monomer components containing four types of monomers of oxybenzenesulfonic acid (any of salts) as essential components; average addition mole of alkylene oxide having 2 to 18 carbon atoms Poly (alkylene glycol) mono (meth) allylene having a polyoxyalkylene chain added in an amount of 2 to 300 A copolymer obtained by copolymerizing a monomer component containing an ether monomer and a maleic acid monomer as essential components; an alkylene oxide having 2 to 4 carbon atoms in an average addition mole number of 2 to 300 Obtained by copolymerizing a monomer component containing, as essential components, a polyalkylene glycol mono (meth) allyl ether monomer having an added polyoxyalkylene chain and a polyalkylene glycol ester monomer of maleic acid Copolymer: Polyalkylene glycol 3-methyl-3-butenyl ether monomer having a polyoxyalkylene chain obtained by adding 2 to 300 average addition moles of alkylene oxide having 2 to 4 carbon atoms and maleic acid monomer And a copolymer obtained by copolymerizing a monomer component containing a monomer as an essential component. The known cement admixture can be used in combination.

When the known cement dispersant is used, the blending weight ratio between the cement admixture and the known cement admixture is uniquely determined by the difference in the type, blending, and test conditions of the known cement admixture used. Is not determined, but is preferably in the range of 5:95 to 95: 5, more preferably 10:90 to 90:10.
Furthermore, the said cement composition can contain the other well-known cement additive (material) which is illustrated to the following (1)-(20).

(1) Water-soluble polymer substance: unsaturated carboxylic acid polymer such as polyacrylic acid (sodium), polymethacrylic acid (sodium), polymaleic acid (sodium), sodium salt of acrylic acid / maleic acid copolymer; methyl Nonionic cellulose ethers such as cellulose, ethyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, and hydroxypropyl cellulose; polysaccharides such as methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl cellulose A part of or all of the hydroxyl groups of the alkylated or hydroxyalkylated derivatives of the present invention are a hydrophobic substituent having a hydrocarbon chain having 8 to 40 carbon atoms as a partial structure, a sulfonic acid group or Polysaccharide derivatives substituted with an ionic hydrophilic substituent containing such a salt as a partial structure; yeast glucan, xanthan gum, β-1.3 glucan (both linear and branched chain, one example For example, polysaccharides produced by microbial fermentation such as curdlan, paramylon, pachyman, scleroglucan, laminaran, etc.); polyacrylamide; polyvinyl alcohol; starch; starch phosphate ester; sodium alginate; gelatin; Copolymers of acrylic acid having groups and quaternary compounds thereof.

(2) Polymer emulsion: Copolymers of various vinyl monomers such as alkyl (meth) acrylate.
(3) retarder: oxycarboxylic such as gluconic acid, glucoheptonic acid, arabonic acid, malic acid or citric acid, and inorganic salts or organic salts thereof such as sodium, potassium, calcium, magnesium, ammonium, triethanolamine, etc. Acids: monosaccharides such as glucose, fructose, galactose, saccharose, xylose, apiose, ribose, isomerized sugar, oligosaccharides such as disaccharide and trisaccharide, oligosaccharides such as dextrin, polysaccharides such as dextran, etc. Sugars such as molasses; sugar alcohols such as sorbitol; magnesium silicofluoride; phosphoric acid and its salts or borate esters; aminocarboxylic acids and salts thereof; alkali-soluble proteins; humic acid; tannic acid; Polyhydric alcohols such as glycerin; Phosphonic acid and derivatives thereof such as phonic acid), 1-hydroxyethylidene-1,1-diphosphonic acid, ethylenediaminetetra (methylenephosphonic acid), diethylenetriaminepenta (methylenephosphonic acid), and alkali metal salts and alkaline earth metal salts thereof etc.

(4) Early strengthening agents / accelerators: soluble calcium salts such as calcium chloride, calcium nitrite, calcium nitrate, calcium bromide and calcium iodide; chlorides such as iron chloride and magnesium chloride; sulfates; potassium hydroxide; Sodium hydroxide; carbonate; thiosulfate; formate such as formic acid and calcium formate; alkanolamine; alumina cement; calcium aluminate silicate.
(5) Mineral oil-based antifoaming agent: cocoon oil, liquid paraffin, etc.
(6) Fat and oil-based antifoaming agents: animal and vegetable oils, sesame oil, castor oil, and alkylene oxide adducts thereof.

(7) Fatty acid-based antifoaming agent: oleic acid, stearic acid, and these alkylene oxide adducts.
(8) Fatty acid ester antifoaming agent: glycerin monoricinoleate, alkenyl succinic acid derivative, sorbitol monolaurate, sorbitol trioleate, natural wax and the like.

(9) Oxyalkylene antifoaming agents: polyoxyalkylenes such as (poly) oxyethylene (poly) oxypropylene adducts; diethylene glycol heptyl ether, polyoxyethylene oleyl ether, polyoxypropylene butyl ether, polyoxyethylene polyoxypropylene (Poly) oxyalkyl ethers such as 2-ethylhexyl ether and oxyethyleneoxypropylene adducts to higher alcohols having 12 to 14 carbon atoms; (poly) oxy such as polyoxypropylene phenyl ether and polyoxyethylene nonylphenyl ether Alkylene (alkyl) aryl ethers; 2,4,7,9-tetramethyl-5-decyne-4,7-diol, 2,5-dimethyl-3-hexyne-2,5-diol, 3-methyl-1 − Acetylene ethers obtained by addition polymerization of alkylene oxide to acetylenic alcohol such as tin-3-ol; (poly) oxyalkylene fatty acid esters such as diethylene glycol oleate, diethylene glycol laurate, ethylene glycol distearate; polyoxyethylene (Poly) oxyalkylene sorbitan fatty acid esters such as sorbitan monolaurate and polyoxyethylene sorbitan trioleate; (poly) oxyalkylene alkyl such as sodium polyoxypropylene methyl ether sulfate and sodium polyoxyethylene dodecylphenol ether sulfate ( Aryl) ether sulfate salts; (poly) oxyethylene stearyl phosphates, etc. Sialic sharp emission alkyl phosphate esters; polyoxyethylene such as polyoxyethylene lauryl amine (poly) oxyalkylene alkyl amines; polyoxyalkylene amide.

(10) Alcohol-based antifoaming agent: octyl alcohol, hexadecyl alcohol, acetylene alcohol, glycols and the like.
(11) Amide antifoaming agent: acrylate polyamine and the like.
(12) Phosphate ester antifoaming agent: tributyl phosphate, sodium octyl phosphate, etc.
(13) Metal soap type antifoaming agent: aluminum stearate, calcium oleate, etc.
(14) Silicone antifoaming agent: dimethyl silicone oil, silicone paste, silicone emulsion, organically modified polysiloxane (polyorganosiloxane such as dimethylpolysiloxane), fluorosilicone oil and the like.

(15) AE agent: resin soap, saturated or unsaturated fatty acid, sodium hydroxystearate, lauryl sulfate, ABS (alkyl benzene sulfonic acid), LAS (linear alkyl benzene sulfonic acid), alkane sulfonate, polyoxyethylene alkyl (phenyl) ether , Polyoxyethylene alkyl (phenyl) ether sulfate or a salt thereof, polyoxyethylene alkyl (phenyl) ether phosphate or a salt thereof, protein material, alkenyl sulfosuccinic acid, α-olefin sulfonate, and the like.

(16) Other surfactants: aliphatic monohydric alcohols having 6 to 30 carbon atoms in the molecule such as octadecyl alcohol and stearyl alcohol, and those having 6 to 30 carbon atoms in the molecule such as abiethyl alcohol Intramolecular such as alicyclic monohydric alcohol, dodecyl mercaptan, etc. Intramolecular such as monovalent mercaptan having 6-30 carbon atoms in the molecule, such as nonylphenol, alkylphenol having 6-30 carbon atoms in the molecule, dodecylamine, etc. 10 mol or more of an alkylene oxide such as ethylene oxide or propylene oxide was added to a carboxylic acid having 6 to 30 carbon atoms in the molecule such as an amine having 6 to 30 carbon atoms, lauric acid or stearic acid. Polyalkylene oxide derivatives having an alkyl or alkoxy group as a substituent Alkyl diphenyl ether sulfonates in which two phenyl groups having a sulfone group are ether-bonded; various anionic surfactants; various cationic surfactants such as alkylamine acetate and alkyltrimethylammonium chloride; various nonionics Surfactant; various amphoteric surfactants.

(17) Waterproofing agent: fatty acid (salt), fatty acid ester, oil and fat, silicon, paraffin, asphalt, wax and the like.
(18) Rust inhibitor: nitrite, phosphate, zinc oxide and the like.
(19) Crack reducing agent: polyoxyalkyl ether and the like.
(20) Expansion material: Ettlingite, coal, etc.

Other known cement additives (materials) include, for example, cement wetting agents, thickeners, separation reducing agents, flocculants, drying shrinkage reducing agents, strength enhancers, self-leveling agents, rust inhibitors, colorants, An antifungal agent etc. can be mentioned. The above-mentioned known cement additives (materials) can be used in combination.

In the above cement composition, the following 1) to 7) are particularly preferable embodiments for components other than cement and water.

1) A combination comprising two components, i.e. (i) the cement admixture and (ii) an oxyalkylene-based antifoaming agent. In addition, as a compounding weight ratio of the oxyalkylene type | system | group antifoamer of (ii), the range of 0.01-10 mass% with respect to the cement admixture of (i) is preferable.

2) (i) the above-mentioned cement admixture, (ii) a polyalkylene glycol mono (meth) acrylate ester-based unit having a polyoxyalkylene chain in which an alkylene oxide having 2 to 18 carbon atoms is added in an average addition mole number of 2 to 300 A copolymer comprising a monomer, a (meth) acrylic acid monomer, and a monomer copolymerizable with these monomers (Japanese Patent Publication No. 59-18338, Japanese Patent Laid-Open No. 7-223852, (Iii) (iii) a combination comprising essentially three components of an oxyalkylene antifoaming agent. The blending weight ratio of the cement admixture (i) and the copolymer (ii) is preferably in the range of 5:95 to 95: 5, and more preferably in the range of 10:90 to 90:10. The blending weight ratio of the oxyalkylene antifoaming agent (iii) is preferably in the range of 0.01 to 10% by mass with respect to the total amount of the cement admixture (i) and the copolymer (ii). .

3) A combination comprising essentially two components: (i) the cement admixture, and (ii) a sulfonic acid-based dispersant having a sulfonic acid group in the molecule. Examples of the sulfonic acid dispersant include lignin sulfonate, naphthalene sulfonic acid formalin condensate, melamine sulfonic acid formalin condensate, polystyrene sulfonate, aminoaryl sulfonic acid-phenol-formaldehyde condensate and the like. An agent or the like can be used. The blending weight ratio of the cement admixture (i) and the sulfonic acid dispersant (ii) is preferably in the range of 5:95 to 95: 5, more preferably in the range of 10:90 to 90:10. preferable.

4) A combination that essentially comprises two components (i) the cement admixture and (ii) lignin sulfonate. The blending weight ratio of the cement admixture (i) and the lignin sulfonate salt (ii) is preferably in the range of 5:95 to 95: 5, and more preferably in the range of 10:90 to 90:10. .

5) A combination comprising two components of (i) the above cement admixture and (ii) a material separation reducing agent. As a material separation reducing agent, various thickeners such as nonionic cellulose ethers, a hydrophobic substituent consisting of a hydrocarbon chain having 4 to 30 carbon atoms as a partial structure and an alkylene oxide having 2 to 18 carbon atoms are added on average. A compound having a polyoxyalkylene chain having 2 to 300 moles added can be used. In addition, as a compounding weight ratio of the cement admixture of (i) and the material separation reducing agent of (ii), the range of 10: 90-99.99: 0.01 is preferable, and 50: 50-99.9: A range of 0.1 is more preferred. A cement composition comprising this combination is suitable as high fluidity concrete, self-filling concrete, and self-leveling material.

6) A combination comprising two components of (i) the cement admixture and (ii) retarder. As the retarder, oxycarboxylic acids such as gluconic acid (salt) and citric acid (salt), sugars such as glucose, sugar alcohols such as sorbitol, phosphonic acids such as aminotri (methylenephosphonic acid), etc. can be used. . The blending weight ratio of the cement admixture (i) and the retarder (ii) is preferably in the range of 50:50 to 99.9: 0.1, and in the range of 70:30 to 99: 1. More preferred.

7) A combination comprising two components of (i) the cement admixture and (ii) an accelerator. As the promoter, the blending weight ratio with the promoter of (ii) such as calcium chloride, calcium nitrite, calcium nitrate is preferably in the range of 10:90 to 99.9: 0.1, and 20:80 to 99. A range of: 1 is more preferred.

The method for producing a polymer having a (poly) alkylene glycol chain of the present invention has the above-described configuration, and can be suitably used for various applications such as a cement admixture, and can accelerate the setting time of concrete. The polymer which has a (poly) alkylene glycol chain which can improve the early strength of is obtained.

The present invention will be described in more detail with reference to the following examples. However, the present invention is not limited to these examples. Unless otherwise specified, “part” means “part by weight” and “%” means “mass%”.

<Measurement conditions for the amount of by-produced polyalkylene glycol produced (by-product PEG amount)>
Column used: Shodex
GF-1G 7B
GF-310 HQ
Eluent: water / acetonitrile = 98/2 (mass%)
Sample: A sample adjusted to 0.1% using the above eluent.
Sample injection amount: 200 μL
Column temperature: 40 ° C
Flow rate: 1 mL / min Detector: Waters 2414 RI detector System: Waters alliance 2695
Analysis software: Waters Empower2 (standard package / GPC option)

<Conditions for LC measurement of isomers>
Column used: GL Sciences
Inertsil guard column 1 Inertsil ODS-25 μm 4.6 mm × 250 mm 3 eluent: Water was added to 52.5 g of acetic acid and 3.75 g of sodium acetate trihydrate to make 9000 g, and further 6000 g of acetonitrile was added.
Sample: The sample was adjusted to 1.0% with the above eluent.
Sample injection amount: 100 μL
Flow rate: 0.6 mL / min Column temperature: 40 ° C
System: Waters alliance 2695
Detector: Waters 2414 RI detector analysis software: Empower2 Software manufactured by Waters

<LC separation conditions for isomers>
Column used: Shiseido Fine Chemical
MGII 5 μm 10 mm (ID) × 250 mm 1 eluent: acetonitrile / water = 45/55 (vol%)
Sample: A sample adjusted to 10% with the above eluent.
Sample injection amount: 100 μL
Flow rate: 1.0 mL / min Column temperature: 40 ° C
System: Waters alliance 2695
Detector: Waters 2414 RI detector analysis software: Empower2 Software manufactured by Waters
Fractionation conditions: Each fraction was fractionated into a test tube every 30 seconds after the isomer peak was detected. When M-12 synthesized in Production Example 12 was fractionated under the above conditions, an isomer peak appeared at about 22 minutes, and a sample taken out 90 to 300 seconds after peak detection was fractionated.

<GPC measurement conditions>
The GPC measurement conditions are as follows.
Column used: TSK guard column SWXL manufactured by Tosoh Corporation
TSKgel G4000SWXL
TSKgel G3000SWXL
TSKgel G2000SWXL connected in this order.
Eluent: A solution prepared by dissolving 115.6 g of sodium acetate trihydrate in a solution of 6001 g of acetonitrile and 10999 g of water and adjusting the pH to 6.0 with acetic acid was used.
Sample: A polymer aqueous solution dissolved in the eluent so that the polymer concentration is 0.5% by mass.
Sample injection amount: 100 μL
Flow rate: 1.0 mL / min Column temperature: 40 ° C
System: Waters alliance 2695
Detector: Waters 2414 RI detector analysis software: Empower2 Software manufactured by Waters
Standard material for preparing calibration curve: polyethylene glycol [peak top molecular weight (MP) 272500, 219300, 107000, 50000, 24000, 11840, 6450, 4250, 1470]
Calibration curve: Prepared by a cubic equation based on the Mp value and elution time of the above polyethylene glycol.

[Production Example 1] MLA10 from methallyl alcohol
A SUS autoclave reaction vessel equipped with a thermometer, stirrer, raw material introduction tube and nitrogen introduction tube was charged with 282 g of methallyl alcohol and 0.2 g of sodium hydroxide as an addition reaction catalyst, and the inside of the reaction vessel was purged with nitrogen under stirring. And heated to 110 ° C. under a nitrogen atmosphere. Then, 1719 g of ethylene oxide was introduced into the reactor while maintaining 110 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The resulting reaction product (hereinafter referred to as M-1) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-10) obtained by adding an average of 10 moles of ethylene oxide to methallyl alcohol. And by-product A-1. Byproduct B-1 was not detected. By-product A-1 is water-soluble polyalkylene glycol (polyethylene glycol). The analysis result of the reaction product M-1 is shown in Table 1.

[Production Example 2] MLA-10 to MLA-50
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 2017 g of the reaction product (M-1) obtained in Production Example 1, 48% aqueous sodium hydroxide solution 1 as an addition reaction catalyst .45 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 100 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 110 ° C. in a nitrogen atmosphere. Then, 6983 g of ethylene oxide was introduced into the reactor while maintaining 110 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-2) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-50) obtained by adding 50 moles of ethylene oxide to methallyl alcohol on average. And by-product A-2. Byproduct B-2 was not detected. Byproduct A-2 contains water-soluble polyalkylene glycol (polyethylene glycol). The analysis result of the reaction product M-2 is shown in Table 1.

[Production Example 3] MLA50 to MLA120
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 3821 g of the reaction product (M-2) obtained in Production Example 2, 48% sodium hydroxide aqueous solution 1 as an addition reaction catalyst 0.08 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 100 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 110 ° C. in a nitrogen atmosphere. Then, 5179 g of ethylene oxide was introduced into the reactor while maintaining 110 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-3) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-120) obtained by adding an average of 120 moles of ethylene oxide to methallyl alcohol. And by-product A-3. Byproduct B-3 was not detected. Byproduct A-3 contains water-soluble polyalkylene glycol (polyethylene glycol). The analysis result of the reaction product M-3 is shown in Table 1.

[Production Example 4] MLA10 from methallyl alcohol
A SUS autoclave reaction vessel equipped with a thermometer, stirrer, raw material introduction tube and nitrogen introduction tube was charged with 282 g of methallyl alcohol and 0.4 g of sodium hydroxide as an addition reaction catalyst, and the inside of the reaction vessel was purged with nitrogen under stirring. And heated to 130 ° C. under a nitrogen atmosphere. Then, 1719 g of ethylene oxide was introduced into the reactor while maintaining 130 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-4) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-10) obtained by adding an average of 10 moles of ethylene oxide to methallyl alcohol. And by-product A-4 and by-product B-4. Byproduct A-4 is a water-soluble polyalkylene glycol (polyethylene glycol), and byproduct B-4 is an isomer of an unsaturated polyalkylene glycol ether monomer. Table 1 shows the analysis results of the reaction product M-4.

[Production Example 5] MLA10 to MLA50
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 2017 g of the reaction product (M-4) obtained in Production Example 4, 48% sodium hydroxide aqueous solution 2 as an addition reaction catalyst .9 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 130 ° C. in a nitrogen atmosphere. Then, 6983 g of ethylene oxide was introduced into the reactor while maintaining 130 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-5) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-50) obtained by adding an average of 50 moles of ethylene oxide to methallyl alcohol. And by-product A-5 and by-product B-5. The by-product A-5 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-5 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-5 are shown in Table 1.

[Production Example 6] MLA50 to MLA120
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 3821 g of the reaction product (M-5) obtained in Production Example 5, 48% sodium hydroxide aqueous solution 2 as an addition reaction catalyst .16 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 130 ° C. in a nitrogen atmosphere. Then, 5179 g of ethylene oxide was introduced into the reactor while maintaining 130 ° C. under a safe pressure, and the reaction was terminated by maintaining the temperature until the alkylene oxide addition reaction was completed. The obtained reaction product (hereinafter referred to as M-6) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-120) obtained by adding an average of 120 moles of ethylene oxide to methallyl alcohol. And by-product A-6 and by-product B-6. The by-product A-6 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-6 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-6 are shown in Table 1.

[Production Example 7] MLA120 to MLA150
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introducing tube and a nitrogen introducing tube, 3065 g of the reaction product (M-5) obtained in Production Example 5, 48% sodium hydroxide aqueous solution 2 as an addition reaction catalyst .47 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 130 ° C. in a nitrogen atmosphere. Then, 5935 g of ethylene oxide was introduced into the reactor while maintaining 130 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-7) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-150) obtained by adding an average of 150 moles of ethylene oxide to methallyl alcohol. And by-product A-7 and by-product B-7. The by-product A-7 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-7 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-7 are shown in Table 1.
FIG. 2 shows an LC chart measured under LC conditions of the isomer of the reaction product M-7 obtained in Production Example 7.

[Comparative Production Example 1] MLA1 to MLA20
A SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube was charged with 1097 g of ethylene glycol monomethallyl ether and 4.5 g of sodium hydroxide as an addition reaction catalyst. Substitution and heating to 150 ° C. under nitrogen atmosphere. Then, 7903 g of ethylene oxide was introduced into the reactor while maintaining 150 ° C. under safe pressure, and the reaction was terminated by maintaining the temperature until the alkylene oxide addition reaction was completed. The obtained reaction product (hereinafter referred to as M-8) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-20) obtained by adding 20 moles of ethylene oxide on average to methallyl alcohol. And by-product A-8 and by-product B-8. Byproduct A-8 is a water-soluble polyalkylene glycol (polyethylene glycol), and byproduct B-8 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-8 are shown in Table 1.

[Comparative Production Example 2] MLA20 to MLA120
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 337.9 g of the reaction product (M-8) obtained in Production Example 8, 48% sodium hydroxide as an addition reaction catalyst 1.63 g of an aqueous solution was charged, and the inside of the reaction vessel was purged with nitrogen under stirring, and then heated to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 150 ° C. in a nitrogen atmosphere. Then, 1562 g of ethylene oxide was introduced into the reactor while maintaining 150 ° C. under safe pressure, and the reaction was terminated by maintaining the temperature until the alkylene oxide addition reaction was completed. The obtained reaction product (hereinafter referred to as M-8) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-120) obtained by adding an average of 120 moles of ethylene oxide to methallyl alcohol. And by-product A-9 and by-product B-9. The by-product A-9 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-9 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-9 are shown in Table 1.

[Comparative Production Example 3] MLA10 from methallyl alcohol
A SUS autoclave reaction vessel equipped with a thermometer, stirrer, raw material introduction tube and nitrogen introduction tube was charged with 1400 g of methallyl alcohol and 2.5 g of sodium hydroxide as an addition reaction catalyst, and the reaction vessel was purged with nitrogen under stirring. And heated to 150 ° C. under a nitrogen atmosphere. Then, 4297 g of ethylene oxide was introduced into the reactor while maintaining 150 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-10) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-10) obtained by adding an average of 10 moles of ethylene oxide to methallyl alcohol. And by-product A-10 and by-product B-10. The by-product A-10 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-10 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-10 are shown in Table 1.

[Comparative Production Example 4] MLA10 to MLA50
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introduction tube and a nitrogen introduction tube, 2017 g of the reaction product (M-10) obtained in Production Example 10, 48% sodium hydroxide aqueous solution 7 as an addition reaction catalyst .27 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 150 ° C. in a nitrogen atmosphere. Then, 6983 g of ethylene oxide was introduced into the reactor while maintaining 150 ° C. under a safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-11) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-50) obtained by adding an average of 50 moles of ethylene oxide to methallyl alcohol. A by-product A-11 and a by-product B-11 are included. The by-product A-11 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-11 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-11 are shown in Table 1.

[Comparative Production Example 5] MLA50 to MLA150
In a SUS autoclave reaction vessel equipped with a thermometer, a stirrer, a raw material introducing tube and a nitrogen introducing tube, 3065 g of the reaction product (M-11) obtained in Production Example 11, 48% sodium hydroxide aqueous solution 6 as an addition reaction catalyst 6 .18 g was charged, the inside of the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 105 ° C. Next, a pipe equipped with a glass trap was connected from the top of the reaction vessel while stirring, and the inside of the reaction vessel was depressurized to 6.65 × 103 Pa (50 Torr) using a vacuum pump. Thereafter, dehydration was performed at the same temperature for 1 hour while cooling the glass trap in an ethanol dry ice bath. After dehydration, the temperature was raised to 150 ° C. in a nitrogen atmosphere. Then, 5935 g of ethylene oxide was introduced into the reactor while maintaining 150 ° C. under safe pressure, and the temperature was maintained until the alkylene oxide addition reaction was completed to complete the reaction. The obtained reaction product (hereinafter referred to as M-12) was an unsaturated polyalkylene glycol ether monomer (hereinafter referred to as MLA-150) obtained by adding an average of 150 moles of ethylene oxide to methallyl alcohol. And by-product A-12 and by-product B-12. The by-product A-12 contains water-soluble polyalkylene glycol (polyethylene glycol), and the by-product B-12 is an isomer of an unsaturated polyalkylene glycol ether monomer. The analysis results of the reaction product M-12 are shown in Table 1.
FIG. 3 shows an LC chart measured under the LC conditions of the isomer of the reaction product M-12 obtained in Comparative Production Example 5.

FIG. 4 shows the LC chart of M-12, and Table 2 shows the results of the LC analysis results, such as the retention time, peak area, and peak height. Further, the by-product B-12 contained in the reactive organism M-12 is fractionated using liquid chromatography, and the LC chart of the isolated by-product B-12 is shown in FIG. The results of the retention time, peak area, peak height, etc. are shown in Table 3. The charts of FIGS. 4 and 5 were measured under the LC separation conditions of isomers. Further, NMR measurement of B-12 isolated by fractionation was performed to identify its structure. The NMR analysis result of M-12 is shown in FIG. From the NMR analysis results, the structure of B-12 has the following chemical formula:

I found out. In the above formula, A to D correspond to signals A to D in the NMR chart.

Comparative Production Example 3 was synthesized according to the method for producing methallyl alcohol 10EO disclosed in JP-A No. 2003-221266 and JP-T-2006-522744.

<< Polymerization process >>
[Production Example 8] In a glass reactor equipped with an M-3 (MLA120) polymerization thermometer, stirrer, dropping device, nitrogen introduction tube and reflux cooling device, 101 g of ion-exchanged water, unsaturated polyalkylene glycol ether system As a monomer, 196 g of the reaction product (M-3) obtained in Production Example 3 and 0.07 g of acrylic acid were charged, the inside of the reaction apparatus was purged with nitrogen under stirring, and heated to 58 ° C. in a nitrogen atmosphere. With the inside of the reaction vessel kept at 58 ° C., 14.95 g of 2% aqueous hydrogen peroxide solution was added. An acrylic acid aqueous solution consisting of 9.96 g of acrylic acid and 15.18 g of ion exchange water was dropped over 3 hours while maintaining the inside of the reaction vessel at 58 ° C., and at the same time, L-ascorbine was added to 36.19 g of ion exchange water. An aqueous solution in which 0.774 g of acid and 0.541 g of 3-mercaptopropionic acid were dissolved was dropped over 3.5 hours. Thereafter, the temperature was maintained at 58 ° C. for 2 hours, and then the polymerization reaction was completed. Thereafter, the acidic reaction solution was neutralized to pH 6 using an aqueous sodium hydroxide solution at a temperature not higher than the polymerization reaction temperature to obtain the cement dispersant 1 of the present invention comprising a polymer aqueous solution having a weight average molecular weight of 52800.

[Production Example 9] In a glass reactor equipped with an M-6 (MLA120) polymerization thermometer, stirrer, dropping device, nitrogen introduction tube and reflux cooling device, 101 g of ion-exchanged water, unsaturated polyalkylene glycol ether system As a monomer, 196 g of the reaction product (M-6) obtained in Production Example 6 and 0.14 g of acrylic acid were charged, and the inside of the reaction apparatus was purged with nitrogen under stirring, and heated to 58 ° C. in a nitrogen atmosphere. With the inside of the reaction vessel kept at 58 ° C., 14.95 g of 2% aqueous hydrogen peroxide solution was added. An acrylic acid aqueous solution consisting of 9.89 g of acrylic acid and 15.14 g of ion-exchanged water was dropped over 3 hours while maintaining the inside of the reaction vessel at 58 ° C., and at the same time, L-ascorbine was added to 36.19 g of ion-exchanged water. An aqueous solution in which 0.774 g of acid and 0.541 g of 3-mercaptopropionic acid were dissolved was dropped over 3.5 hours. Thereafter, the temperature was maintained at 58 ° C. for 2 hours, and then the polymerization reaction was completed. Thereafter, the acidic reaction solution was neutralized to pH 6 using an aqueous sodium hydroxide solution at a temperature not higher than the polymerization reaction temperature to obtain the cement dispersant 2 of the present invention comprising a polymer aqueous solution having a weight average molecular weight of 52100.

[Comparative Production Example 6] In a glass reactor equipped with a polymerization thermometer of M-9 (MLA120), a stirrer, a dropping device, a nitrogen introduction tube and a reflux cooling device, 101 g of ion-exchanged water, unsaturated polyalkylene glycol ether 196 g of the reaction product (M-9) obtained in Comparative Production Example 2 and 0.35 g of acrylic acid were charged as system monomers, and the inside of the reactor was purged with nitrogen under stirring and heated to 58 ° C. in a nitrogen atmosphere. did. With the inside of the reaction vessel kept at 58 ° C., 14.95 g of 2% aqueous hydrogen peroxide solution was added. An acrylic acid aqueous solution consisting of 9.67 g of acrylic acid and 15.04 g of ion-exchanged water was dropped over 3 hours while maintaining the inside of the reaction vessel at 58 ° C., and at the same time, L-ascorbine was added to 36.19 g of ion-exchanged water. An aqueous solution in which 0.774 g of acid and 0.541 g of 3-mercaptopropionic acid were dissolved was dropped over 3.5 hours. Thereafter, the temperature was maintained at 58 ° C. for 2 hours, and then the polymerization reaction was completed. Thereafter, the acidic reaction solution was neutralized to pH 6 using an aqueous sodium hydroxide solution at a temperature not higher than the polymerization reaction temperature to obtain a comparative cement dispersant 1 comprising a polymer aqueous solution having a weight average molecular weight of 48,200.

[Production Example 10] In a glass reactor equipped with a polymerization thermometer, a stirrer, a dropping device, a nitrogen introduction tube and a reflux cooling device for M-7 (MLA150), 97 g of ion-exchanged water, an unsaturated polyalkylene glycol ether system As a monomer, 188 g of the reaction product (M-7) obtained in Production Example 7 and 0.14 g of acrylic acid were charged, and the inside of the reaction apparatus was purged with nitrogen under stirring, and heated to 58 ° C. in a nitrogen atmosphere. With the inside of the reaction vessel kept at 58 ° C., 23.93 g of 2% aqueous hydrogen peroxide solution was added. An acrylic acid aqueous solution composed of 18.12 g of acrylic acid and 10.40 g of ion-exchanged water was dropped over 3 hours while maintaining the inside of the reaction vessel at 58 ° C., and at the same time, L-ascorbine was added to 35.39 g of ion-exchanged water. An aqueous solution in which 1.24 g of acid and 0.866 g of 3-mercaptopropionic acid were dissolved was dropped over 3.5 hours. Thereafter, the temperature was maintained at 58 ° C. for 2 hours, and then the polymerization reaction was completed. Thereafter, the acidic reaction solution was neutralized to pH 6 using an aqueous sodium hydroxide solution at a temperature not higher than the polymerization reaction temperature to obtain the cement dispersant 3 of the present invention comprising a polymer aqueous solution having a weight average molecular weight of 42400.

[Comparative Production Example 7] In a glass reactor equipped with an M-12 (MLA150) polymerization thermometer, stirrer, dropping device, nitrogen introduction tube and reflux cooling device, 97 g of ion-exchanged water, unsaturated polyalkylene glycol ether 188 g of the reaction product (M-12) obtained in Comparative Production Example 5 and 0.34 g of acrylic acid were charged as a system monomer, and the inside of the reactor was purged with nitrogen under stirring, and heated to 58 ° C. in a nitrogen atmosphere. did. With the inside of the reaction vessel kept at 58 ° C., 23.93 g of 2% aqueous hydrogen peroxide solution was added. An acrylic acid aqueous solution composed of 17.91 g of acrylic acid and 10.30 g of ion exchange water was dropped over 3 hours while maintaining the inside of the reaction vessel at 58 ° C., and at the same time, L-ascorbine was added to 35.39 g of ion exchange water. An aqueous solution in which 1.24 g of acid and 0.866 g of 3-mercaptopropionic acid were dissolved was dropped over 3.5 hours. Thereafter, the temperature was maintained at 58 ° C. for 2 hours, and then the polymerization reaction was completed. Thereafter, the acidic reaction solution was neutralized to pH 6 using an aqueous sodium hydroxide solution at a temperature not higher than the polymerization reaction temperature to obtain a comparative cement dispersant 2 comprising a polymer aqueous solution having a weight average molecular weight of 38100.

<< Mortar test >>
(Solid content measurement)
The polymer used for the performance test was measured for non-volatile content according to the following procedure, and the obtained non-volatile content was calculated as the polymer concentration.
About 0.5 g of the polymer aqueous solution was weighed into an aluminum cup, and about 1 g of ion-exchanged water was added to spread it uniformly. This was dried at 130 ° C. for 1 hour in a nitrogen atmosphere, and the nonvolatile content was measured from the mass difference before drying.
(Adjustment of cement admixture aqueous solution)
Weigh out a predetermined amount of polymer aqueous solution, add 10% by mass of the defoamer MA404 (Pozoris product) stock solution diluted 100 times to the polymer content, and further add ion-exchanged water to make 270 g. Was uniformly dissolved.

(Contains mortar)
The mortar formulation was C / S / W = 900/1350/270 (g). However,
C: Ordinary Portland cement (manufactured by Taiheiyo Cement)
S: ISO standard sand (made by Cement Association)
W: Cement admixture aqueous solution (mortar experimental environment)
The experimental environment was a temperature of 20 ° C. ± 1 ° C. and a relative humidity of 60% ± 10%.

(Measurement of flow value)
After 900 g of the cement and 270 g of the cement admixture aqueous solution were kneaded from a Hobart type mortar mixer (model No. N-50: manufactured by Hobart Co., Ltd.) at a low speed from 30 seconds, 1350 g of the ISO sand was added to the cement paste over 30 seconds. Next, after kneading at high speed for 30 seconds, the rotation was stopped and the mortar on the wall of the kettle was scraped off over 15 seconds. The mixture was further left for 75 seconds and then kneaded at high speed for 60 seconds to prepare a mortar.
Half of the prepared mortar was packed into a flow cone (JIS standard) placed on a horizontal table and pierced 15 times using a stick. In addition, the mortar was filled to the full extent of the flow cone, and pierced 15 times with a stick. Thereafter, the flow cone filled with mortar was gently lifted vertically, the major axis (mm) and minor axis (mm) of the mortar spread on the table were measured, and the average value was taken as the mortar flow value.

(Measurement of mortar air volume)
About 200 mL of mortar was packed in a 500 mL glass graduated cylinder, struck with a round bar having a diameter of 8 mm, and the container was vibrated to remove coarse bubbles. Furthermore, after adding about 200 mL of mortar and removing bubbles in the same manner, the volume and mass were measured, and the amount of air was calculated from the mass and the density of each material.
(Mortar test results)
Tables 4 to 7 show the results of mortar tests performed using the polymer of the present invention and the comparative polymer.

From Table 4, the cement dispersant 1 of the present invention using the reaction product (M-3) obtained in Production Example 3 as an unsaturated polyalkylene glycol ether monomer and the reaction product obtained in Production Example 6 The cement dispersant 2 of the present invention using the product (M-6) as an unsaturated polyalkylene glycol ether monomer is obtained by converting the reaction product (M-9) obtained in Comparative Production Example 2 into an unsaturated polyalkylene glycol. It was found that a higher flow value was exhibited with the same addition amount as compared with the comparative cement dispersant 1 used as the ether monomer.

From Table 5, the cement dispersant 1 of the present invention using the reaction product (M-3) obtained in Production Example 3 as an unsaturated polyalkylene glycol ether monomer is the reaction obtained in Comparative Production Example 2. Compared with the comparative cement dispersant 1 using the product (M-9) as an unsaturated polyalkylene glycol ether monomer, the amount added to obtain the same flow value can be reduced by about 14%. The cement dispersant 2 of the present invention using the reaction product (M-6) obtained in 6 as an unsaturated polyalkylene glycol ether monomer is the reaction product (M-9) obtained in Comparative Production Example 2. It was found that the amount added to obtain the same flow value can be reduced by about 10% compared to Comparative Cement Dispersant 1 using) as an unsaturated polyalkylene glycol ether monomer.

From Table 6, the cement dispersant 3 of the present invention using the reaction product (M-7) obtained in Production Example 7 as an unsaturated polyalkylene glycol ether monomer is the reaction obtained in Comparative Production Example 5. It was found that the product (M-12) exhibited a high flow value at the same addition amount as compared with the comparative cement dispersant 2 using the unsaturated polyalkylene glycol ether monomer.

From Table 7, the cement dispersant 3 of the present invention using the reaction product (M-7) obtained in Production Example 7 as an unsaturated polyalkylene glycol ether monomer is the reaction obtained in Comparative Production Example 5. It was found that the amount added to obtain the same flow value can be reduced by about 21% compared to the comparative cement dispersant 2 using the product (M-12) as an unsaturated polyalkylene glycol ether monomer.

FIG. 1 is a schematic view showing one preferred embodiment of the method for producing a polymer having a (poly) alkylene glycol chain of the present invention. FIG. 2 is an LC chart of M-7 obtained in Production Example 7. FIG. 3 is an LC chart of M-12 obtained in Comparative Production Example 5 which is an n50 unsaturated (poly) alkylene glycol ether monomer. FIG. 4 is an LC chart of M-12 obtained in Comparative Production Example 5 (measured under LC separation conditions for isomers). FIG. 5 shows an LC chart of by-product B-12 obtained by isolating isomer (by-product) B-12 in M-12 obtained in Comparative Production Example 5 (LC separation conditions for isomers). Is measured). FIG. 6 is an NMR analysis result of by-product B-12 obtained by isolating isomer (by-product) B-12 in M-12 obtained in Comparative Production Example 5.

Explanation of symbols

1: Eluent peak 2: A-12
3: MLA-150
4: B-12

Claims (5)

A method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly) alkylene glycol ether monomer,
The production method comprises a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups of less than 30 and its isomer is 100: 0 to 2 in mass ratio. A monomer in which an alkylene oxide is reacted to give an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene group of 50 or more and its isomer in a mass ratio of 100: 0 to 10 Obtaining the ingredients;
And a step of polymerizing essentially a monomer component containing an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of the oxyalkylene group of 50 or more. A method for producing a polymer having a glycol chain. A method for producing a polymer having a (poly) alkylene glycol chain by polymerizing a monomer component containing an unsaturated (poly) alkylene glycol ether monomer,
The production method comprises a monomer component in which an unsaturated (poly) alkylene glycol ether monomer having an average addition mole number of oxyalkylene groups of less than 30 and its isomer is 100: 0 to 2 in mass ratio. A method for producing a polymer having a (poly) alkylene glycol chain, which comprises a step of polymerizing. A mixture of the unsaturated (poly) alkylene glycol ether monomer having an average added mole number of the oxyalkylene group of less than 30 and its isomer is converted into an unsaturated alcohol or an unsaturated (poly) alkylene glycol ether monomer. The method for producing a polymer having a (poly) alkylene glycol chain according to claim 1 or 2, wherein the polymer is produced by a step of reacting an alkylene oxide. A polymer having a (poly) alkylene glycol chain obtained by the production method according to claim 1. A cement admixture comprising the polymer according to claim 4.

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