JP2017065989A - Dispersant for hydraulic composition and hydraulic composition containing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dispersant for hydraulic composition high in coagulation rate, excellent in flow retention capacity and capable of suppressing increase of viscosity when made as a hydraulic composition and the hydraulic composition containing the same.SOLUTION: There is provided a dispersant for hydraulic composition containing a polycarboxylic acid copolymer containing a constitutional unit derived from a monomer represented by the formula (1), an unsaturated monocarboxylic acid-based constitutional unit and a constitutional unit derived from an unsaturated dicarboxylic acid monomer or a salt thereof (A). R-O-(AO)-R(1), where Ris C2 to 5, AO is each independently a C2 to 18 oxyalkylene group, n1 is average addition mole number of the oxyalkylene group and the number of 1 to 200 and Ris H or a C1 to 30 hydrocarbon group.SELECTED DRAWING: None

Description

  The present invention relates to a dispersant for a hydraulic composition and a hydraulic composition containing the dispersant.

  In order to improve the workability and durability of concrete, it is effective to reduce the amount of unit water in the concrete. However, it is known that when the unit water amount is reduced, the fluidity of concrete is lowered and the workability is impaired. Therefore, in order to ensure efficient workability of the concrete even when the unit water amount is reduced, various dispersants for hydraulic compositions having a function of dispersing cement particles are used.

  When manufacturing concrete, it is required that the speed at which the concrete material is kneaded is high, the fluidity after kneading is high, the fluidity retention is high, the curing speed is high, and the concrete viscosity is reduced.

  In order to improve the curing rate, it has been reported that it is effective to increase the length of the alkylene oxide chain in the polycarboxylic acid copolymer (Patent Documents 1, 2, and 3).

  Patent Document 4 discloses a polycarboxylic acid-based copolymer containing a specific structural unit which has a low fluidity and low viscosity.

JP 2001-220417 A JP 2010-189200 A JP 2014-031296 A Japanese Patent No. 3819271

  However, the dispersants for hydraulic compositions described in Patent Documents 1 to 4 still have room for improvement in terms of fluidity retention and concrete viscosity.

  Further, when the concrete viscosity immediately after the concrete is compared with the concrete viscosity after holding the slump, there is a problem that the concrete viscosity after holding the slump increases. In particular, the increase in the viscosity of the concrete after holding the slump may not be sufficiently filled with the concrete at the time of placing and may cause a decrease in the strength of the hardened concrete.

  In the present invention, in order to solve the above problems, a hydraulic composition capable of suppressing the increase in viscosity of the hydraulic composition when the setting speed is high, the fluid holding performance is excellent, and the hydraulic composition is used. It is an object to provide a dispersant for physical properties and a hydraulic composition containing the same.

  As a result of intensive studies to achieve the above object, the present inventors have found that a structural unit having an alkenyl group having a specific number of carbon atoms, an unsaturated monocarboxylic structural unit, and an unsaturated dicarboxylic acid monomer. It discovered that the dispersing agent for hydraulic compositions containing the polycarboxylic acid-type copolymer containing the derived structural unit or its salt could solve the said subject, and came to this invention.

（式中、Ｒ³、Ｒ⁴およびＲ⁵は、それぞれ独立に、水素原子または炭素原子数１〜３のアルキル基を表す。ｍは、０〜２の数を表す。Ａ²Ｏは、同一若しくは異なって、炭素原子数２〜１８のオキシアルキレン基を表す。ｎ２は、オキシアルキレン基の平均付加モル数であり、１〜２００の数を表す。Ｘは、水素原子または炭素原子数１〜３０の炭化水素基を表す。）
〔５〕〔１〕〜〔４〕のいずれか一項に記載の水硬性組成物用分散剤を含む水硬性組成物。 That is, the present invention includes the following [1] to [5].
[1] A structural unit derived from the monomer (I) represented by the following general formula (1), a structural unit derived from the unsaturated monocarboxylic acid monomer (II), and an unsaturated dicarboxylic acid based monomer Copolymerization of each monomer, including structural units derived from the body (III) and structural units derived from other monomers (IV) copolymerizable with the monomers (I) to (III) Polycarboxylic acid copolymer or salt thereof in which the weight ratio at the time is 1 ≦ (I) ≦ 97, 1 ≦ (II) ≦ 50, 0.01 ≦ (III) <1, 0 ≦ (IV) ≦ 50 A dispersant for a hydraulic composition, comprising:
R ¹ —O— (A ¹ O) _n1 —R ² (1)
(In the formula, R ¹ represents an alkenyl group having 2 to 5 carbon atoms. A ¹ O is the same or different and represents an oxyalkylene group having 2 to 18 carbon atoms. N1 represents an oxyalkylene group. (The average number of moles added represents a number of 1 to 200. R ² represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms.)
[2] The dispersant for hydraulic composition according to [1], wherein the monomer (I) is a number in which n1 in the general formula (1) is 1 or more and less than 100.
[3] The dispersant for hydraulic composition according to [1] or [2], wherein the polycarboxylic acid copolymer or a salt thereof has a weight average molecular weight of 5,000 to 30,000 in terms of polyethylene glycol.
[4] A structural unit derived from the monomer (VI) represented by the following general formula (2), a structural unit derived from the monomer (II), and the monomers (VI) and (II) And a structural unit derived from the monomer (I), a polycarboxylic acid copolymer containing a structural unit derived from another monomer (VII) that can be copolymerized with the monomer (I), and / or a salt thereof. A polycarboxylic acid copolymer or a salt thereof comprising a structural unit derived from the monomer (II) and another monomer (VIII) copolymerizable with the monomers (I) and (II). Furthermore, the dispersing agent for hydraulic compositions as described in any one of [1]-[3].

(In the formula, R ³ , R ⁴ and R ⁵ each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. M represents a number of 0 to ^2. A ² O is the same. Or, differently, it represents an oxyalkylene group having 2 to 18 carbon atoms, n2 is an average addition mole number of the oxyalkylene group, and represents a number of 1 to 200. X is a hydrogen atom or 1 to 1 carbon atoms. Represents 30 hydrocarbon groups.)
[5] A hydraulic composition comprising the dispersant for hydraulic composition according to any one of [1] to [4].

  According to the present invention, a dispersing agent for a hydraulic composition capable of suppressing an increase in viscosity of the hydraulic composition when the setting speed is high, the fluid holding performance is excellent, and the hydraulic composition is obtained. A hydraulic composition containing the same is provided.

  The dispersant for hydraulic composition of the present invention contains the component (A) and may further contain the component (B) and / or the component (C).

<(A) component>
The component (A) is a polycarboxylic acid copolymer or a salt (A) thereof. The polycarboxylic acid copolymer or salt (A) thereof is a structural unit derived from the monomer (I) represented by the general formula (1) (hereinafter sometimes referred to as monomer (I)). An unsaturated monocarboxylic acid monomer (II) (hereinafter, a structural unit derived from monomer (II), an unsaturated dicarboxylic acid monomer (III) (hereinafter, monomer (III) If necessary, the monomer (I) to (III) can be further copolymerized with other monomer (IV) (hereinafter referred to as monomer (IV). The polycarboxylic acid copolymer or its salt (A) may be a structural unit or monomer derived from the monomers (I) to (III). It is preferable to consist of each structural unit derived from (I)-(IV).

  The weight ratio of each monomer at the time of copolymerization of the polycarboxylic acid copolymer or salt (A) is as follows.

  The weight ratio of the monomer (I) is 1 ≦ (I) ≦ 97, preferably 10 ≦ (I) ≦ 97, and more preferably 20 ≦ (I) ≦ 97.

  The weight ratio of the monomer (II) is 1 ≦ (II) ≦ 50, preferably 1 ≦ (II) ≦ 40, and more preferably 1 ≦ (II) ≦ 30.

  The weight ratio of the monomer (III) is 0.01 ≦ (III) <1, preferably 0.05 ≦ (III) <1, and more preferably 0.1 ≦ (III) <1.

  The weight ratio of the monomer (IV) is 0 ≦ (IV) ≦ 50, preferably 0 ≦ (IV) ≦ 40, and more preferably 0 ≦ (IV) ≦ 30.

  In addition, the said weight ratio is the mixture ratio of monomer (I) + weight ratio of monomer (II) + weight ratio of monomer (III) + weight ratio of monomer (IV) = 100 wt% Is the weight ratio.

  Hereinafter, first, the monomer (I) will be described.

  Monomer (I) is a polyalkylene glycol monoalkenyl ether represented by the following general formula (1).

R ¹ —O— (A ¹ O) _n1 —R ² (1)
(In the formula, R ¹ represents an alkenyl group having 2 to 5 carbon atoms. A ¹ O is the same or different and represents an oxyalkylene group having 2 to 18 carbon atoms. N1 represents an oxyalkylene group. (The average number of moles added represents a number of 1 to 200. R ² represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms.)

R ¹ in the general formula (1) represents an alkenyl group having 2 to 5 carbon atoms. The number of carbon atoms of the alkenyl group is preferably 3-5. Examples of R ¹ include, but are not limited to, an allyl group, a methallyl group, a residue of 3-methyl-3-buten-1-ol, and the like.

A ¹ O in the general formula (1) is the same or different and represents an oxyalkylene group having 2 to 18 carbon atoms. Examples of the oxyalkylene group include oxyethylene group (ethylene glycol unit), oxypropylene group (propylene glycol unit), oxybutylene group (butylene glycol unit), oxyethylene group (ethylene glycol unit), oxypropylene Groups (propylene glycol units) are preferred.

The above “same or different” means that when A ¹ O is contained in the general formula (1) (when n1 is 2 or more), each A ¹ O may be the same oxyalkylene group. It may be different (two or more) oxyalkylene groups. In the case where a plurality of A ¹ O are contained in the general formula (1), the oxyethylene group (ethylene glycol unit), the oxypropylene group (propylene glycol unit) and the oxybutylene group (butylene glycol unit) are used. An embodiment in which two or more selected oxyalkylene groups are mixed is exemplified, and an embodiment in which an oxyethylene group (ethylene glycol unit) and an oxypropylene group (propylene glycol unit) are mixed, or an oxyethylene group (ethylene glycol unit) and oxy A mode in which a butylene group (butylene glycol unit) is mixed is preferable, and a mode in which an oxyethylene group (ethylene glycol unit) and an oxypropylene group (propylene glycol unit) are mixed is more preferable. In an embodiment in which different oxyalkylene groups are mixed, the addition of two or more oxyalkylene groups may be a block addition or a random addition. When the oxyethylene group and the oxypropylene group are mixed, the ratio of the average addition mole number of the oxyethylene group and the oxypropylene group is the average addition mole number of the oxyethylene group / average addition mole number of the oxypropylene group = 50 to 99. It is preferably 9% / 50 to 0.1%.

  N1 in General formula (1) is the average addition mole number of an oxyalkylene group, and represents the number of 1-200. n1 is 200 or less, preferably 150 or less, and preferably less than 100. The lower limit may be 1 or more. Therefore, it is preferably 1 to 150, more preferably 1 or more and less than 100. In this specification, the average number of moles of oxyalkylene group added means the average number of moles of alkylene glycol units added to 1 mole of monomer.

R ² in the general formula (1) represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. R ² is a hydrogen atom or a hydrocarbon group having 1 to 10 carbon atoms because the cement dispersibility of the dispersant for hydraulic composition can be further exhibited by the group having a relatively small number of carbon atoms. Are more preferable, a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms is more preferable, and a hydrogen atom or a methyl group is most preferable.

  Examples of the method for producing the monomer (I) include a method in which 1 to 200 mol of alkylene oxide is added to an unsaturated alcohol such as allyl alcohol, methallyl alcohol, and 3-methyl-3-buten-1-ol. It is done.

  As the monomer (I), for example, (poly) ethylene glycol allyl ether, (poly) ethylene glycol methallyl ether, (poly) ethylene glycol 3-methyl-3-butenyl ether, (poly) ethylene (poly) propylene Glycol allyl ether, (poly) ethylene (poly) propylene glycol methallyl ether, (poly) ethylene glycol (poly) propylene glycol 3-methyl-3-butenyl ether, (poly) ethylene (poly) butylene glycol allyl ether, (poly ) Ethylene (poly) butylene glycol methallyl ether, (poly) ethylene (poly) butylene glycol 3-methyl-3-butenyl ether, methoxy (poly) ethylene glycol allyl ether, methoxy (poly) ethylene glycol Ryl ether, methoxy (poly) ethylene glycol 3-methyl-3-butenyl ether, methoxy (poly) ethylene (poly) propylene glycol allyl ether, methoxy (poly) ethylene (poly) propylene glycol methallyl ether, methoxy (poly) ethylene ( Poly) propylene glycol 3-methyl-3-butenyl ether, methoxy (poly) ethylene (poly) butylene glycol allyl ether, methoxy (poly) ethylene (poly) butylene glycol methallyl ether, methoxy (poly) ethylene (poly) butylene glycol 3-methyl-3-butenyl ether, (poly) ethylene glycol (poly) propylene glycol monoallyl ether, (poly) ethylene glycol (poly) propylene glycol monomethallyl Ether, and 3-methyl-3-butene-1-ethylene oxide-propylene oxide adduct of ol. As the monomer (I), one or more of these can be used. Since the balance between hydrophilicity and hydrophobicity is good, the monomer (I) contains (poly) ethylene glycol (meth) allyl ether, (poly) ethylene glycol (poly) propylene glycol monoallyl ether, (poly) ethylene glycol ( Poly) propylene glycol monomethallyl ether, (poly) ethylene glycol (poly) propylene glycol 3-methyl-3-butenyl ether, (poly) ethylene glycol methallyl ether, (poly) ethylene glycol 3-methyl-3-butenyl ether It is preferable to include any one or more selected from ethylene oxide adduct of 3-methyl-3-buten-1-ol and ethylene oxide propylene oxide adduct of 3-methyl-3-buten-1-ol. Any of these Polyethylene glycol polypropylene glycol monoallyl ether, polyethylene glycol polypropylene glycol monomethallyl ether, polyethylene glycol polypropylene glycol 3-methyl-3-butenyl ether, polyethylene glycol monomethallyl ether, polyethylene glycol 3-methyl-3-butenyl More preferred is an ethylene oxide propylene oxide adduct of ether and 3-methyl-3-buten-1-ol. The average added mole number of the oxyalkylene group (polyalkylene glycol unit) of the monomer (I) is preferably 1 to 70, more preferably 5 to 70, and further preferably 8 to 70. preferable. In the present specification, “(poly)” means that one or two or more constituent elements or raw materials described immediately after that are bonded.

  The monomer (I) may be a monomer represented by the general formula (1) alone or a combination of two or more.

Next, the monomer (II) will be described. Examples of the monomer (II) include monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid, and salts thereof (for example, monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts). Can be mentioned. Monomer (II) should just be 1 or 2 or more of these. The monomer (II) preferably contains 1 or 2 or more selected from the group consisting of acrylic acid, methacrylic acid and any salt thereof, and may be 1 or 2 or more selected from such group. preferable.
When acrylic acid and methacrylic acid are used in combination, the acrylic acid / methacrylic acid is usually (0.1% to 99.9%) / (99.9% to 100% by weight). 0.1%), preferably (1% to 99%) / (99% to 1%).

  The monocarboxylic acid is preferably a mixture containing a monomer and a dimer. In the case of acrylic acid, a mixture of acrylic acid monomer and dimer is preferable. The ratio of the two (the total is 100% by weight) is preferably acrylic acid monomer / acrylic acid dimer = (90.0% by weight to 100% by weight) / (0% by weight to 10% by weight).

  Subsequently, the monomer (III) will be described. Monomer (III) is an unsaturated dicarboxylic acid monomer, for example, dicarboxylic acids such as maleic acid and fumaric acid, salts thereof (for example, monovalent metal salts, divalent metal salts, ammonium salts, Organic amine salts) and anhydrides. The monomer (III) is preferably one or more selected from these, more preferably maleic acid, a salt thereof and an anhydride, and even more preferably maleic anhydride.

  Furthermore, monomer (IV) is demonstrated. Monomer (IV) is not particularly limited as long as it is a monomer copolymerizable with one or more monomers selected from the group consisting of monomers (I), (II) and (III) . The monomer (IV) does not include the monomers (I) to (III).

  As the monomer (IV), the following can be exemplified, and one or more of these can be used;

で示されるジアリルビスフェノール類、例えば４，４’−ジヒドロキシジフェニルプロパン、４，４’−ジヒドロキシジフェニルメタン、４，４’−ジヒドロキシジフェニルスルホンの３および３’位アリル置換物； Formula (IV-1):

Diallyl bisphenols, such as 4,4′-dihydroxydiphenylpropane, 4,4′-dihydroxydiphenylmethane, and 3 and 3 ′ allyl substitutes of 4,4′-dihydroxydiphenylsulfone;

で示されるモノアリルビスフェノール類、例えば４，４’−ジヒドロキシジフェニルプロパン、４，４’−ジヒドロキシジフェニルメタン、４，４’−ジヒドロキシジフェニルスルホンの３位アリル置換物； General formula (IV-2):

Monoallyl bisphenols represented by the formula: for example, 4,4'-dihydroxydiphenylpropane, 4,4'-dihydroxydiphenylmethane, 3-position allyl substitute of 4,4'-dihydroxydiphenylsulfone;

で示されるアリルフェノール； General formula (IV-3):

An allylphenol;

Half esters and diesters of unsaturated dicarboxylic acids such as maleic acid, maleic anhydride, fumaric acid, itaconic acid, citraconic acid and alcohols having 1 to 30 carbon atoms;
Half amides and diamides of the above unsaturated dicarboxylic acids and amines having 1 to 30 carbon atoms;
Half esters and diesters of an alkyl (poly) alkylene glycol 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 acid;
Half esters and diesters of the above unsaturated dicarboxylic acids and glycols having 2 to 18 carbon atoms or polyalkylene glycols having 2 to 500 addition moles of these glycols;
Half amides of maleamic acid and glycols having 2 to 18 carbon atoms or polyalkylene glycols having 2 to 500 addition moles of these glycols;

(Poly) alkylene glycols such as triethylene glycol di (meth) acrylate, (poly) ethylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, (poly) ethylene glycol (poly) propylene glycol di (meth) acrylate, etc. Di (meth) acrylates;
Polyfunctional (meth) acrylates such as hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane di (meth) acrylate;
(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) acrylamidomethylsulfonic acid, (meth) acrylamidoethylsulfonic acid, 2- Unsaturated sulfonic acids such as methylpropanesulfonic acid (meth) acrylamide and styrenesulfonic acid, and monovalent metal salts, divalent metal salts, ammonium salts and organic amine salts thereof;
Amides of unsaturated monocarboxylic acids such as methyl (meth) acrylamide and amines having 1 to 30 carbon atoms;
Vinyl aromatics such as styrene, α-methylstyrene, vinyltoluene, p-methylstyrene;
Alkanediol mono (meth) acrylates such as 1,4-butanediol mono (meth) acrylate, 1,5-pentanediol mono (meth) acrylate, 1,6-hexanediol mono (meth) acrylate;
Dienes such as butadiene, isoprene, 2-methyl-1,3-butadiene, 2-chloro-1,3-butadiene;

Unsaturated amides such as (meth) acrylamide, (meth) acrylic alkylamide, 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;
Unsaturation such as aminoethyl (meth) acrylate, methylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, dibutylaminoethyl (meth) acrylate, vinylpyridine, etc. Amines;
Divinyl aromatics such as divinylbenzene; cyanurates such as triallyl cyanurate;
Allyls such as (meth) allyl alcohol and glycidyl (meth) allyl ether;
Vinyl ethers or allyl ethers such as methoxypolyethylene glycol monovinyl ether, polyethylene glycol monovinyl ether, methoxypolyethylene glycol mono (meth) allyl ether, polyethylene glycol mono (meth) allyl ether; and
Polydimethylsiloxanepropylaminomaleamic acid, polydimethylsiloxaneaminopropylaminomaleamic acid, polydimethylsiloxane-bis- (propylaminomaleamic acid), polydimethylsiloxane-bis- (dipropylaminomaleamic acid), polydimethyl Siloxane- (1-propyl-3-acrylate), polydimethylsiloxane- (1-propyl-3-methacrylate), polydimethylsiloxane-bis- (1-propyl-3-acrylate), polydimethylsiloxane-bis- (1 Siloxane derivatives such as -propyl-3-methacrylate).

  Monomer (VI) may be individual and may be a combination of two or more.

  Monomer (VI) preferably contains 3 and 3 'allylic substitutions of 4,4'-dihydroxydiphenylsulfone, and is a 3 and 3' allylic substitution of 4,4'-dihydroxydiphenylsulfone. It is preferable.

  The weight average molecular weight of the polycarboxylic acid copolymer or salt (A) is preferably 5,000 or more, more preferably 6,000 or more, and further preferably 6,500 or more. 9,000 or more is particularly preferable. As a result, the cement dispersibility of the dispersant for hydraulic composition is sufficiently exerted, and a water reduction rate exceeding that of AE water reducing agents such as lignin sulfonic acid type or oxycarboxylic acid type can be obtained, and fluidity or workability is improved. Thus, the intended effect as a dispersant for a hydraulic composition can be sufficiently exhibited. The upper limit of the weight average molecular weight is preferably 60,000 or less, more preferably 50,000 or less, and still more preferably 30,000 or less. Thereby, the aggregation effect | action of a cement particle is suppressed and workability | operativity can be made favorable. The weight average molecular weight is preferably 5,000 to 60,000, more preferably 6,000 to 50,000, and even more preferably 9,000 to 30,000.

  The molecular weight distribution (Mw / Mn) of the polycarboxylic acid copolymer or its salt (A) is preferably 1.2 or more, and more preferably 1.25 or more. The upper limit is preferably 3.0 or less, and more preferably 2.50 or less. The molecular weight distribution is preferably in the range of 1.2 to 3.0.

  In addition, the weight average molecular weight in this invention can be measured by the well-known method converted into polyethyleneglycol by gel permeation chromatography (GPC).

Although there is no limitation in particular as measurement conditions of GPC, the following conditions can be mentioned as an example. The weight average molecular weight in the latter examples is a value measured under these conditions.
Measuring device; column used by Tosoh; Shodex Column OH-pak SB-806HQ, SB-804HQ, SB-802.5HQ
Eluent: 0.05 mM sodium nitrate / acetonitrile 8/2 (v / v)
Standard material: Polyethylene glycol (Tosoh, GL Science)
Detector: differential refractometer (manufactured by Tosoh)
Calibration curve; polyethylene glycol standard

  The component (A) may be a polycarboxylic acid copolymer or a salt thereof (A) alone, or may be a combination of two or more different polycarboxylic acid copolymers or salts (A) thereof. Also good.

<(B) component>
The component (B) is a polycarboxylic acid copolymer or a salt (B) thereof. The polycarboxylic acid copolymer or salt (B) thereof is a structural unit derived from the monomer (VI) represented by the general formula (2) (hereinafter sometimes referred to as monomer (VI)). And a structural unit derived from the monomer (II). If necessary, it may further contain a structural unit derived from the other monomer (VII) copolymerizable with the monomers (VI) and (II). The polycarboxylic acid copolymer or a salt thereof (B) is derived from each constituent unit derived from the copolymers (VI) and (II), or from the monomers (VI), (II) and (VII). It is preferable to consist of each structural unit. The component (B) is distinguished from the components (A) and (C) (for example, the polycarboxylic acid copolymer or the salt (B) is derived from the monomers (I) and (III). Does not include building blocks).

  The monomer (VI) is represented by the following general formula (2).

（式中、Ｒ³、Ｒ⁴およびＲ⁵は、それぞれ独立に、水素原子または炭素原子数１〜３のアルキル基を表す。ｍは、０〜２の数を表す。Ａ²Ｏは、同一若しくは異なって、炭素原子数２〜１８のオキシアルキレン基を表す。ｎ２は、オキシアルキレン基の平均付加モル数であり、１〜２００の数を表す。Ｘは、水素原子または炭素原子数１〜３０の炭化水素基を表す。）

(In the formula, R ³ , R ⁴ and R ⁵ each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. M represents a number of 0 to ^2. A ² O is the same. Or, differently, it represents an oxyalkylene group having 2 to 18 carbon atoms, n2 is an average addition mole number of the oxyalkylene group, and represents a number of 1 to 200. X is a hydrogen atom or 1 to 1 carbon atoms. Represents 30 hydrocarbon groups.)

R ³ , R ⁴ and R ⁵ in the general formula (2) each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

A ² O in the general formula (2) is the same or different and represents an oxyalkylene group having 2 to 18 carbon atoms. Examples of the oxyalkylene group include oxyethylene group (ethylene glycol unit), oxypropylene group (propylene glycol unit), oxybutylene group (butylene glycol unit), oxyethylene group (ethylene glycol unit), oxypropylene Groups (propylene glycol units) are preferred.

The above “same or different” means that when A ² O is contained in the general formula (2) (when n2 is 2 or more), each A ² O may be the same oxyalkylene group. Meaning that it may be different (two or more) oxyalkylene groups. The embodiments where the general formula (2) A ² O in contains multiple oxyethylene group (ethylene glycol units), from the group consisting of oxypropylene groups (propylene glycol units) and oxybutylene group (butylene glycol units) An embodiment in which two or more selected oxyalkylene groups are mixed is exemplified, and an embodiment in which an oxyethylene group (ethylene glycol unit) and an oxypropylene group (propylene glycol unit) are mixed, or an oxyethylene group (ethylene glycol unit) and oxy A mode in which a butylene group (butylene glycol unit) is mixed is preferable, and a mode in which an oxyethylene group (ethylene glycol unit) and an oxypropylene group (propylene glycol unit) are mixed is more preferable. In an embodiment in which different oxyalkylene groups are mixed, the addition of two or more oxyalkylene groups may be a block addition or a random addition.

  N2 in General formula (2) is the average addition mole number of an oxyalkylene group, a minimum is 1 or more, and 5 or more are preferable. The upper limit is 200 or less, and preferably 160 or less. Therefore, n2 represents the number of 1-200, it is preferable that it is 5-200, and it is more preferable that it is 5-160.

The monomer (VI) may be a monomer represented by the general formula (2) alone or a combination of two or more. Two or more combinations are the two types of monomers (VIa) and (VIb) having different average addition mole numbers of oxyalkylene groups (provided that the average addition mole number of oxyalkylene groups is n2a and n2b, respectively, n2a <N2b.) Is preferred, and such a combination is preferred. Thereby, even if it adds to a hydraulic composition and passes for a long time, the outstanding fluidity | liquidity can be exhibited. The monomer (VIa) and the monomer (VIb) are different from each other only in the average addition mole number n2 of the oxyalkylene group, and R ³ , R ⁴ , R ⁵ , m, and X are the same monomers. In addition to n2, at least one of R ³ , R ⁴ , R ⁵ , m, and X may be a different monomer. n2a is preferably 1 to 20. n2b is preferably from 21 to 200, and more preferably from 21 to 160.

  When the monomer (VI) is a combination of the monomers (VIa) and (VIb), the respective weight ratios (total is 100% by weight) are such that (VIa) / (VIb) is (0.1 To 99.9) / (99.9 to 0.1), more preferably (1 to 99) / (99 to 1), and (10 to 90) / (90 to 10). Is more preferable, and (25 to 75) / (75 to 25) is particularly preferable.

  X in the general formula (2) represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms. If the number of carbon atoms increases, the cement dispersibility of the dispersant for hydraulic composition may not be sufficiently exhibited. Therefore, X is preferably hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, A hydrocarbon group having 1 to 5 carbon atoms is more preferable, and a hydrogen atom or a methyl group is most preferable.

  Examples of the monomer (VI) include an unsaturated monocarboxylic acid such as (meth) acrylate (hereinafter, “(meth) acrylate” means “acrylate or methacrylate”), and (poly) ethylene glycol. , (Poly) ethylene (poly) propylene glycol, (poly) ethylene (poly) butylene glycol, methoxy (poly) ethylene glycol, methoxy (poly) ethylene (poly) propylene glycol, methoxy (poly) ethylene (poly) butylene glycol, etc. Of (poly) alkylene glycols. Also, for example, (poly) ethylene glycol (meth) acrylate, (poly) ethylene (poly) propylene glycol (meth) acrylate, (poly) ethylene (poly) butylene glycol (meth) acrylate, methoxy (poly) ethylene glycol (meth) Examples include (poly) alkylene glycol (meth) acrylates such as acrylate, methoxy (poly) ethylene (poly) propylene glycol (meth) acrylate, and methoxy (poly) ethylene (poly) butylene glycol (meth) acrylate. Monomer (VI) may be one or a combination of two or more of these. The monomer (VI) preferably contains methoxy (poly) ethylene glycol (meth) acrylate, and methoxy (poly) ethylene glycol (meth) acrylate (for example, methoxypolyethylene glycol methacrylate), (poly) ethylene glycol ( At least one selected from meth) acrylate (for example, hydroxyethyl acrylate), (poly) propylene glycol (meth) acrylate (for example, hydroxypropyl acrylate) and methoxy (poly) ethylene glycol (meth) acrylate, or two or more thereof It is more preferable that the combination of these is included. The average number of added moles of (poly) alkylene glycol is preferably 1-50. When the monomer (VIa) is (poly) alkylene glycol, the number of added moles of (poly) alkylene glycol as the monomer (VIa) is preferably 1-20. When monomer (VIb) is (poly) alkylene glycol, the number of moles of (poly) alkylene glycol added as monomer (IIb) is preferably 21 to 200, and preferably 21 to 160. Is more preferable.

  Next, the monomer (II) will be described. Examples and preferred examples of the monomer (II) are the same as the examples and preferred examples of the monomer (II) described above for the component (A).

  Subsequently, the monomer (VII) will be described. The monomer (VII) is not particularly limited as long as it can be copolymerized with one or more monomers selected from the group consisting of the monomers (VI) and (II). Examples and preferred examples of the monomer (VII) are the same as the examples and preferred examples of the monomer (IV) described above.

  The polymerization ratio of the polymer at the time of copolymerization when obtaining the polycarboxylic acid copolymer or the salt (B) thereof is as follows. In the case of copolymerization, since a part of the monomer usually remains in the reaction system without copolymerization, it is difficult to specify the ratio of each structural unit in the polycarboxylic acid copolymer.

  The weight ratio of the monomer (VI) is preferably 1 ≦ (VI) ≦ 97, more preferably 10 ≦ (VI) ≦ 97, and further preferably 20 ≦ (VI) ≦ 97.

  The weight ratio of the monomer (II) is preferably 1 ≦ (II) ≦ 50, more preferably 1 ≦ (II) ≦ 40, and further preferably 1 ≦ (II) ≦ 30.

  The weight ratio of the monomer (VII) is preferably 0 ≦ (VII) ≦ 50, more preferably 0 ≦ (VII) ≦ 40, and further preferably 0 ≦ (VII) ≦ 30.

  The weight ratio is a weight ratio when the weight ratio of monomer (VI) + the weight ratio of monomer (II) + the weight ratio of monomer (VII) = 100% by weight.

  The weight average molecular weight of the polycarboxylic acid copolymer or salt (B) is preferably 5,000 or more, and more preferably 6,000 or more. The upper limit is more preferably 60,000 or less, and more preferably 50,000 or less. Therefore, it is preferably 5,000 to 60,000, and more preferably 6,000 to 50,000.

  The molecular weight distribution (Mw / Mn) of the polycarboxylic acid copolymer or its salt (B) is preferably 1.2 or more, and more preferably 1.25 or more. The upper limit is preferably 3.0 or less, and more preferably 2.5 or less. Therefore, the molecular weight distribution is preferably in the range of 1.2 to 3.0, more preferably 1.25 to 2.5.

  The component (B) may be a polycarboxylic acid copolymer or a salt thereof (B) alone, or may be a combination of two or more different polycarboxylic acid copolymers or salts (B) thereof. Also good.

  By containing (B) component, the dispersing agent for hydraulic compositions of this invention can exhibit more favorable slump retention.

  When the dispersant for a hydraulic composition of the present invention contains the component (B), the content ratio is preferably 1% by weight or more with respect to the component (A), and preferably 5% by weight or more. More preferably, it is more preferably 10% by weight or more. The upper limit is preferably 99% by weight or less, more preferably 95% by weight or less, and still more preferably 90% by weight or less. Therefore, it is preferably 1% by weight to 99% by weight, more preferably 5% by weight to 95% by weight, and still more preferably 10% by weight to 90% by weight.

<(C) component>
The component (C) is a polycarboxylic acid copolymer or a salt (C) thereof. The polycarboxylic acid copolymer or the salt (C) thereof includes a structural unit derived from the monomer (I) and a structural unit derived from the monomer (II). If necessary, it may further contain a structural unit derived from the monomer (I) and another monomer (VIII) copolymerizable with the monomer (II). The component (C) is distinguished from the components (A) and (B) (for example, the polycarboxylic acid copolymer or its salt (C) is derived from the monomers (III) and (IV). Does not include building blocks).
The monomers (I) and (II) will be described. Examples and preferred examples of the monomer (I) are the same as the examples and preferred examples of the monomer (I) described above for the component (A). Examples and preferred examples of the monomer (II) are the same as the examples and preferred examples of the monomer (II) described above.

  Monomer (VIII) only needs to be copolymerizable with one or more monomers selected from the group consisting of monomers (I) and (II). Examples and preferred examples of the monomer (VIII) are the same as the examples and preferred examples of the monomer (IV) described above.

  The polymerization ratio of each copolymer at the time of copolymerization when obtaining a polycarboxylic acid copolymer or a salt (C) thereof is as follows. In the case of copolymerization, since a part of the monomer usually remains in the reaction system without copolymerization, it is difficult to specify the ratio of each structural unit in the polycarboxylic acid copolymer.

  The weight ratio of the monomer (I) is preferably 1 ≦ (I) ≦ 97, more preferably 10 ≦ (I) ≦ 97, and further preferably 20 ≦ (I) ≦ 97.

  The weight ratio of the monomer (II) is preferably 1 ≦ (II) ≦ 50, more preferably 1 ≦ (II) ≦ 40, and further preferably 1 ≦ (II) ≦ 30.

  The weight ratio of the monomer (VIII) is preferably 0 ≦ (VIII) ≦ 50, more preferably 0 ≦ (VIII) ≦ 40, and further preferably 0 ≦ (VIII) ≦ 30.

  The weight ratio is a weight ratio when the weight ratio of monomer (I) + the weight ratio of monomer (II) + the weight ratio of monomer (VIII) = 100% by weight.

  The weight average molecular weight of the polycarboxylic acid copolymer or salt (C) is preferably 5,000 or more, more preferably 6,000 or more, and further preferably 6,500 or more. . The upper limit is preferably 60,000 or less, and more preferably 50,000 or less. Thereby, the aggregation effect | action of a cement particle is suppressed and workability | operativity can be made favorable. Therefore, it is preferably 5,000 to 60,000, and more preferably 6,000 to 50,000.

  The molecular weight distribution (Mw / Mn) of the polycarboxylic acid copolymer or its salt (C) is preferably 1.2 or more, and more preferably 1.25 or more. The upper limit is preferably 3.0 or less, and more preferably 2.5 or less. Therefore, it is preferably in the range of 1.2 to 3.0, more preferably 1.25 to 2.5.

  The component (C) may be a polycarboxylic acid copolymer or a salt thereof (C) alone, or may be a combination of two or more different polycarboxylic acid copolymers or salts (C) thereof. Also good.

  By containing the component (C), the dispersant for hydraulic composition of the present invention can obtain better slump retention.

  When the dispersing agent for hydraulic compositions of the present invention contains the component (C), the content ratio is preferably 1% by weight or more, preferably 5% by weight or more based on the component (A). More preferably, it is more preferably 10% by weight or more. The upper limit is preferably 99% by weight or less, more preferably 95% by weight or less, and still more preferably 90% by weight or less. Therefore, it is preferably 1% by weight to 99% by weight, more preferably 5% by weight to 95% by weight, and still more preferably 10% by weight to 90% by weight.

  The monomers (I) to (VIII) constituting the components (A), (B) and (C) contained in the dispersant for hydraulic composition are independent of each other, and the components (A) to (C) ), Each monomer may be the same or different.

<Polycarboxylic acid copolymer or salt thereof (A) to (C)>
Examples of the salt of the polycarboxylic acid copolymer in the component (A) include monovalent metal salts, divalent metal salts, ammonium salts, and organic amine salts.

<Production Method of Polycarboxylic Acid Copolymer or Salts (A) to (C)>
The polycarboxylic acid copolymer or its salts (A) to (C) can be produced by copolymerizing respective predetermined monomers. Although the method of copolymerization is not limited, For example, polymerization methods, such as superposition | polymerization in a solvent and block polymerization, are mentioned.

  Examples of the solvent used in the copolymerization in the solvent include water; lower alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol; aromatic hydrocarbons such as benzene, toluene, and xylene; cyclohexane, n-hexane, and the like. Aliphatic hydrocarbons; Esters such as ethyl acetate; Ketones such as acetone and methyl ethyl ketone. From the viewpoint of solubility of the raw material monomer and the resulting copolymer, it is preferable to use one or more selected from the group consisting of water and lower alcohols, and among these, water is more preferable.

  When copolymerization is performed in a solvent, each monomer and a polymerization initiator may be continuously dropped into each reaction vessel, or a mixture of each monomer and a polymerization initiator are dropped continuously into each reaction vessel. Also good. Alternatively, a solvent may be charged into the reaction vessel, and a mixture of the monomer and the solvent and a polymerization initiator solution may be continuously dropped into the reaction vessel, or a part or all of the monomer may be charged into the reaction vessel and polymerized. The initiator may be continuously dropped.

  When carrying out copolymerization in a solvent, it is preferable to mix each monomer in a container different from the reaction container previously set in the container in which the reaction is carried out and then continuously drop it into the reaction container.

  After completion of the copolymerization reaction, the polycarboxylic acid copolymer or the salt thereof (A) to (C) may be contained in the hydraulic composition as it is, including the reaction solvent, etc. You may contain in the state which processed. Examples of the treatment include removal of the reaction solvent, concentration adjustment by concentration or dilution, purification, and pH adjustment. After the completion of the reaction, it is preferable to adjust the concentration and / or adjust the pH in a container installed after the reaction container. The method for adjusting the concentration is not particularly limited, but may be performed by, for example, concentration or dilution by hydration. The pH adjustment will be described later.

  The polymerization initiator that can be used for copolymerization is, for example, persulfates such as ammonium persulfate, sodium persulfate, and potassium persulfate; and water-soluble such as t-butyl hydroperoxide. An organic peroxide is mentioned. In this case, an accelerator such as sodium hydrogen sulfite and a mol salt can be used in combination. When copolymerization is performed in a solvent such as a lower alcohol, aromatic hydrocarbon, aliphatic hydrocarbon, ester or ketone, for example, peroxides such as benzoyl peroxide and lauryl peroxide; cumene peroxide Hydroperoxides such as: aromatic azo compounds such as azobisisobutyronitrile can be used as the polymerization initiator. In this case, an accelerator such as an amine compound can be used in combination. Furthermore, when copolymerization is carried out in a water-lower alcohol mixed solvent, it can be used by appropriately selecting from the aforementioned polymerization initiator or a combination of a polymerization initiator and an accelerator. The polymerization temperature varies depending on the polymerization conditions such as the solvent used and the type of polymerization initiator, but is usually in the range of 50 to 120 ° C.

  In the copolymerization, the molecular weight may be adjusted using a chain transfer agent as necessary. Examples of chain transfer agents include known compounds such as mercaptoethanol, thioglycerol, thioglycolic acid, 2-mercaptopropionic acid, 3-mercaptopropionic acid, thiomalic acid, octyl thioglycolate, and 2-mercaptoethanesulfonic acid. Thiol compounds: phosphorous acid, hypophosphorous acid, and salts thereof (sodium hypophosphite, potassium hypophosphite, etc.), sulfurous acid, hydrogen sulfite, dithionite, metabisulfite, and salts thereof (sulfurous acid) Sodium, potassium sulfite, sodium hydrogen sulfite, potassium hydrogen sulfite, sodium dithionite, potassium dithionite, sodium metabisulfite, potassium metabisulfite, and the like) and lower salts thereof, and the like. These may be used alone or in combination of two or more.

  The polycarboxylic acid copolymer or salts (A) to (C) thereof may further contain a monomer (V) having a higher chain transfer property in addition to the above-described monomers. Thereby, the molecular weight of a polycarboxylic acid-type copolymer or its salt (A)-(C) can be adjusted. Examples of the monomer (V) include (meth) allylsulfonic acid (salt) monomers. The weight ratio of the monomer (V) is usually 20% by weight or less, and preferably 10% by weight or less.

  In addition, the said weight ratio is the weight ratio of monomer (I) + weight ratio of monomer (II) + monomer (III) for the polycarboxylic acid copolymer or salt (A). Weight ratio + weight ratio of monomer (IV) = 100% by weight. For the polycarboxylic acid copolymer or salt (B), the weight ratio of monomer (VI) + weight ratio of monomer (II) + weight ratio of monomer (VII) = 100 wt% It is a weight ratio when doing. For the polycarboxylic acid copolymer or salt (C), the weight ratio of monomer (I) + weight ratio of monomer (II) + weight ratio of monomer (VIII) = 100 wt% It is a weight ratio when doing.

In the case of copolymerization in an aqueous solvent, the pH during polymerization usually becomes strongly acidic due to the influence of a monomer having an unsaturated bond, but this may be adjusted to an appropriate pH. If it is necessary to adjust the pH during polymerization, adjust the pH using an acidic substance such as phosphoric acid, sulfuric acid, nitric acid, alkylphosphoric acid, alkylsulfuric acid, alkylsulfonic acid, or (alkyl) benzenesulfonic acid. Can do. Among these acidic substances, it is preferable to use phosphoric acid because it has a pH buffering action. However, in order to eliminate the instability of the ester bond of the ester monomer, it is preferable to perform the polymerization at pH 2-7. Moreover, although there is no limitation in particular in the alkaline substance which can be used for adjustment of pH, alkaline substances, such as NaOH and Ca (OH) _2, are common. The pH adjustment may be performed on the monomer before polymerization or may be performed on the copolymer solution after polymerization. In addition, these may be subjected to polymerization by adding a part of an alkaline substance before polymerization, and then the pH of the copolymer may be further adjusted.

<Use form (form type) and application of dispersant>
In the dispersant for a hydraulic composition of the present invention, the content of the component (A) is not limited, the component (A) may be included as it is, and a solution in which the component (A) is dissolved in a solvent, You may mix | blend as a disperse | distributed dispersion liquid and a suspended suspension. Moreover, there is no restriction | limiting in the containing form of (B) and (C) component contained as needed, You may contain in the solution, dispersion liquid, or suspension of (A) component. The dispersion may contain other dispersant for hydraulic composition. When the dispersant for hydraulic composition of the present invention contains the component (B) and / or the component (C), the solution, dispersion or suspension of the component (A) and the component (B) and / or the component (C) Alternatively, a solution prepared by dissolving the compound in a solvent, a dispersed dispersion, and a suspended suspension may be separately prepared, and these may be blended to prepare a dispersant for a hydraulic composition.

  The dispersant for hydraulic composition of the present invention can be used in the form of an aqueous solution or in the form of powder after drying. In addition, the time in particular to which the dispersing agent for hydraulic compositions is added to a hydraulic composition is not restrict | limited, For example, the time of use of a hydraulic composition may be sufficient. In addition, a component for a hydraulic composition of the present invention in a powdered form is mixed in advance with a component other than water (for example, cement powder, dry mortar) constituting the hydraulic composition, It can also be used as a premix product to which water is added for floor finishing, grout and the like.

  The dispersant for hydraulic composition of the present invention can be added to a hydraulic material such as cement and used as a hydraulic composition for cement paste, mortar, concrete, plaster and the like.

<Hydraulic composition>
The hydraulic composition of this invention should just contain the dispersing agent for hydraulic compositions, and the hydraulic material to combine is not specifically limited. Examples of the hydraulic material include cement, gypsum (semihydrate gypsum, dihydrate gypsum, etc.), and dolomite. The most common hydraulic material is cement.

  The cement is not particularly limited, but, for example, Portland cement (ordinary, early strength, ultra-early strength, moderate heat, sulfate-resistant and each low alkali type), 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 heat cement (low heat blast furnace cement, fly ash mixing) Low exothermic type blast furnace cement, cement with high content of belite), ultra-high strength cement, cement-based solidified material, eco-cement (cement manufactured from one or more of municipal waste incineration ash and sewage sludge incineration ash) It is done. Blast furnace slag, fly ash, cinder ash, clinker ash, husk ash, silica fume, silica powder, limestone powder and other fine powder, gypsum and the like may be added to the cement.

  Moreover, the hydraulic composition may contain the aggregate. The aggregate may be either a fine aggregate or a coarse aggregate. Examples of aggregates include sand, gravel, crushed stone; granulated slag; recycled aggregate, etc .; siliceous, clay, zircon, high alumina, silicon carbide, graphite, chrome, chromic, magnesia Fireproof aggregates such as

  There is no particular limitation on the blending ratio of the dispersant for hydraulic composition in the hydraulic composition. For example, when the hydraulic composition is mortar or concrete, the added amount (blending amount) of component (A) contained in the dispersant for hydraulic composition is usually based on the total weight of the cement. It is 0.01-5.0 weight%, Preferably it is 0.02-2.0 weight%, More preferably, it is 0.05-1.0 weight%. By setting this addition amount, the obtained hydraulic composition has various preferable effects such as reduction in unit water amount, increase in strength, and improvement in durability. If the blending ratio is less than 0.01% by weight, the resulting hydraulic composition may not be sufficient in terms of performance. Conversely, even if a large amount exceeding 5.0% by weight is used, the effect is substantially There is a risk that it will hit the peak and be disadvantageous in terms of economy.

  The hydraulic composition is effective as, for example, ready-mixed concrete, concrete for concrete secondary products (precast concrete), concrete for centrifugal molding, concrete for vibration compaction, steam-cured concrete, shotcrete, etc. is there. Furthermore, medium-fluidity concrete (concrete with a slump value of 22 to 25 cm), high fluidity concrete (concrete with a slump value of 25 cm or more and a slump flow value of 50 to 70 cm), self-filling concrete, self-leveling material It is also effective as mortar or concrete that requires high fluidity such as.

  The hydraulic composition of the present invention includes other dispersants for cement hydraulic compositions, water-soluble polymers, polymer emulsions, air entrainers, cement wetting agents, swelling agents, waterproofing agents, retarders, thickeners, One or more selected from known additives for concrete such as a flocculant, a drying shrinkage reducing agent, a strength enhancer, a curing accelerator, an antifoaming agent, an AE agent, and other surfactants may be contained.

  Examples of other dispersants for cement hydraulic compositions include dispersants (S) for sulfonic acid-based hydraulic compositions such as naphthalene sulfonic acid formaldehyde condensate, melamine sulfonic acid formaldehyde condensate, and lignin sulfonate. It is done. The content of the dispersant for the sulfonic acid hydraulic composition (S) is 0.01% by weight to 50% with respect to the total amount of the component (A), the component (B), and the component (C) of the present invention. It is preferable that it is weight%. In the present specification, when “the total amount of the component (A), the component (B), and the component (C)” is referred to, all of the component (A), the component (B), and the component (C) are included in the present invention. This means not only the total amount when contained in the dispersant for hydraulic composition, but also any of component (B) and component (C) is contained in the dispersant for hydraulic composition of the present invention. This also means the total amount when the weight of components not included is calculated as 0.

  Examples of the water-soluble polymer (P) include polyalkylene glycol, specifically, polyethylene glycol, polypropylene glycol, polyethylene polypropylene glycol, polyethylene polybutylene glycol, and the like. It is preferable that the content rate of water-soluble polymer (P) is 0.01 to 50 weight% with respect to the total amount of (A) component, (B) component, and (C) component.

  Examples of the retarder include oxycarboxylic acids such as gluconic acid (salt) and citric acid (salt), sugars such as glucose, and sugar alcohols (G) such as sorbitol. It is preferable that the content rate of sugar alcohol (G) is 0.01 to 50 weight% with respect to the total amount of (A) component, (B) component, and (C) component.

  Examples of the curing accelerator include soluble calcium salts such as calcium chloride, calcium nitrite and calcium nitrate, chlorides such as iron chloride and magnesium chloride, and formate salts (K) such as thiosulfate, formic acid and calcium formate. Can be mentioned. It is preferable that the content rate of a hardening accelerator (K) is 0.01 to 50 weight% with respect to the total amount of (A) component, (B) component, and (C) component.

  Examples of the thickener include hydroxypropylmethylcellulose, carboxymethylcellulose, known cellulose nanofibers, and known cellulose nanocrystals (Z). It is preferable that the content rate of a thickener (Z) is 0.01 to 50 weight% with respect to the total amount of (A) component, (B) component, and (C) component.

  The present invention will be described more specifically with reference to the following examples, but the present invention is not limited thereto. In the examples, unless otherwise indicated, “%” means “% by weight” and “parts” means “parts by weight”.

<(A) component>
<Production Example 1>
760 parts of water in a glass reaction vessel equipped with a thermometer, a stirrer, a reflux device, a nitrogen introducing tube and a dropping device, and polyethylene glycol polypropylene glycol monoallyl ether (average addition mole number of ethylene oxide 38, average addition of propylene oxide) Mole number 1, random addition of ethylene oxide and propylene oxide) 1770 parts and 16 parts of maleic anhydride were charged, and the temperature was raised to 90 ° C. with stirring. Thereafter, 214 parts of acrylic acid (monomer / dimer = 99% by weight / 1% by weight), a monomer aqueous solution in which 10 parts of sodium hypophosphite and 1380 parts of water were mixed, a mixed liquid of 15 parts of ammonium persulfate and 485 parts of water, Were continuously dropped into a reaction vessel maintained at 100 ° C. for 2 hours each. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was the copolymer (A-1) (weight average molecular weight 14,000, Mw / Mn 1.7).

<Production Example 2>
In Production Example 1, polyethylene glycol polypropylene glycol monoallyl ether was changed to polyethylene glycol polypropylene glycol monomethallyl ether (average addition mole number of ethylene oxide 39, average addition mole number of propylene oxide 1, random addition of ethylene oxide and propylene oxide). Except for this, it was the same as Production Example 1. The copolymer in the liquid was a copolymer (A-2) (weight average molecular weight 16,000, Mw / Mn 1.7).

<Production Example 3>
In Production Example 1, polyethylene glycol polypropylene glycol monoallyl ether was added to polyethylene glycol polypropylene glycol adduct of 3-methyl-3-buten-1-ol (average added mole number of ethylene oxide 39, average added mole number of propylene oxide 1, Random addition of ethylene oxide and propylene oxide) was the same as in Production Example 1. The copolymer in the liquid was a copolymer (A-3) (weight average molecular weight 16,500, Mw / Mn 1.7).

<Production Example 4>
In a glass reaction vessel equipped with a thermometer, a stirring device, a reflux device, a nitrogen introducing tube and a dropping device, 760 parts of water, 1440 parts of polyethylene glycol monomethallyl ether (average added mole number of ethylene oxide 55), maleic anhydride 16 The temperature of the reaction vessel was raised to 90 ° C. with stirring. Thereafter, an aqueous monomer solution obtained by mixing 170 parts of acrylic acid (monomer / dimer = 99% by weight / 1% by weight), 10 parts of 3-mercaptopropionic acid and 530 parts of water, a mixed solution of 12 parts of ammonium persulfate and 488 parts of water, Were continuously dropped into a reaction vessel maintained at 100 ° C. for 2 hours each. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was the copolymer (A-4) (weight average molecular weight 20,000, Mw / Mn 1.8).

<Production Example 5>
In Production Example 4, the procedure was the same as Production Example 4 except that polyethylene glycol monomethallyl ether (average number of moles of ethylene oxide added 55) was changed to a polyethylene glycol adduct of 3-methyl-3-buten-1-ol. The copolymer in the liquid was a copolymer (A-5) (weight average molecular weight 21,000, Mw / Mn1.8).

<(B) and (C) component>
<Production Example 6>
A glass reaction vessel equipped with a thermometer, a stirrer, a reflux device, a nitrogen introduction tube and a dropping device was charged with 2631 parts of water, the reaction vessel was purged with nitrogen under stirring, and the temperature was raised to 100 ° C. in a nitrogen atmosphere. Thereafter, 806 parts of methoxypolyethylene glycol methacrylate (average added mole number of ethylene oxide 10), 3 parts of the compound in which 3 and 3 ′ positions of 4,4′-dihydroxydiphenylsulfone are allyl substituted, 98 parts of methacrylic acid, and 893 water The monomer aqueous solution in which the components were mixed, and a mixed solution of 17 parts of sodium persulfate and 283 parts of water were continuously added dropwise to the reaction vessel maintained at 100 ° C. for 2 hours. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was the copolymer (B-1) (weight average molecular weight 17,000, Mw / Mn 1.6).

<Production Example 7>
A glass reaction vessel equipped with a thermometer, a stirrer, a reflux device, a nitrogen introduction tube and a dropping device was charged with 2631 parts of water. Thereafter, 806 parts of methoxypolyethylene glycol methacrylate (average number of moles of ethylene oxide added 20), 3 parts of an allyl substituted 3 and 3 'position of 4,4'-dihydroxydiphenylsulfone, 98 parts of methacrylic acid, and 893 water The monomer aqueous solution in which the components were mixed, and a mixed solution of 17 parts of sodium persulfate and 283 parts of water were continuously added dropwise to the reaction vessel maintained at 100 ° C. for 2 hours. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was a copolymer (B-2) (weight average molecular weight 19,000, Mw / Mn 1.6).

<Production Example 8>
148 parts of water and 513 parts of polyethylene glycol monomethallyl ether (average number of added moles of ethylene oxide 40) were charged into a glass reaction vessel equipped with a thermometer, a stirrer, a reflux device, a nitrogen introduction tube and a dropping device. The reaction vessel was purged with nitrogen and heated to 80 ° C. in a nitrogen atmosphere. Thereafter, an aqueous monomer solution obtained by mixing 60 parts of acrylic acid (monomer / dimer = 99% by weight / 1% by weight), 1 part of 30% NaOH aqueous solution, and 288 parts of water, a mixed solution of 7 parts of ammonium persulfate and 113 parts of water, Were continuously dropped into a reaction vessel maintained at 100 ° C. for 2 hours each. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was a copolymer (C-1) (weight average molecular weight 18,000, Mw / Mn 1.7).

<Production Example 9>
501 parts of water and ethylene oxide adduct of 3-methyl-3-buten-1-ol (average number of moles of ethylene oxide added) in a glass reaction vessel equipped with a thermometer, a stirrer, a reflux device, a nitrogen inlet tube and a dropping device 30) Charge 500 parts and 2 parts of a compound in which the 3 and 3 'positions of 4,4'-dihydroxydiphenylsulfone are allyl-substituted, purge the reaction vessel with nitrogen under stirring, and raise the temperature to 80 ° C under a nitrogen atmosphere. did. Thereafter, an aqueous monomer solution obtained by mixing 135 parts of acrylic acid (monomer / dimer = 99% by weight / 1% by weight) and 501 parts of water, and a mixed solution of 12 parts of ammonium persulfate and 188 parts of water were each added for 80 hours. The solution was continuously added dropwise to a reaction vessel maintained at ° C. Furthermore, the aqueous solution of the copolymer was obtained by making it react for 1 hour in the state hold | maintained at 100 degreeC. The copolymer in the liquid was a copolymer (C-2) (weight average molecular weight 20,200, Mw / Mn 1.7).

<Production Example 10>
In Production Example 1, it was the same as Production Example 1 except that maleic anhydride was not used. The copolymer in the liquid was a copolymer (Q-1) (weight average molecular weight 14,500, Mw / Mn 1.7).

<Production Example 11>
In Production Example 2, it was the same as Production Example 2 except that maleic anhydride was not used. The copolymer in the liquid was a copolymer (Q-2) (weight average molecular weight 16,000, Mw / Mn 1.7).

<Production Example 12>
Production Example 3 was the same as Production Example 3 except that maleic anhydride was not used. The copolymer in the liquid was a copolymer (Q-3) (weight average molecular weight 16,500, Mw / Mn 1.7).

<Production Example 13>
In Production Example 4, it was the same as Production Example 4 except that maleic anhydride was not used. The copolymer in the liquid was a copolymer (Q-4) (weight average molecular weight 20,000, Mw / Mn 1.8).

<Production Example 14>
In Production Example 5, it was the same as Production Example 5 except that maleic anhydride was not used. The copolymer in the liquid was a copolymer (Q-5) (weight average molecular weight 21,000, Mw / Mn 1.8).

<Examples 1-11 and Comparative Examples 1-5>
At an ambient temperature (20 ° C.), fine aggregates, cement, water and a hydraulic composition dispersant shown in Table 2 were added as shown in Table 1, and kneaded for 120 seconds by mechanical kneading using a mortar mixer. (The dispersant for the hydraulic composition was mixed with water and added). The mortar flow of each mortar, the J14 funnel flow time, and the maximum temperature arrival time in a simple adiabatic temperature change test were evaluated.

[Measurement of mortar flow value]
The above-mentioned mortar is packed in a hollow cylindrical mini slump cone with a bottom diameter of 20 cm, a top diameter of 10 cm, and a height of 30 cm, and the average value of the two directions of the mortar spread on the table when the mini slump cone is lifted vertically. Was the mortar flow value. The evaluation of the slump retention was performed by repeating the above operation after a predetermined time and determining the change with time of the mortar flow. The higher the mortar flow value after change with time, the better the slump retention of the admixture.

[Viscosity evaluation standard: J14 funnel flow time measurement]
A cylindrical J14 funnel having an upper end of 70 mm, a lower end of 14 mm, and a height of 392 mm was filled with a mortar having a mortar flow value of 230 mm, and the time until the mortar flowed down the J14 funnel was measured. It is estimated that the shorter the J14 funnel flow time, the lower the viscosity of the mortar.

[Evaluation criteria for condensation rate: Simple adiabatic temperature measurement]
The mortar after kneading is put into a plastic cup having a diameter of 6.5 cm and a height of 6.5 cm, and placed in a heat insulating container of 20 cm × 20 cm × 20 cm. A thermocouple was inserted into the mortar in the heat insulating container, and the temperature was continuously measured with an external recording device. The time to reach the maximum temperature was read from the temperature history with the start of mortar kneading as 0 minutes, and the time was reached. The shorter the maximum temperature arrival time, the faster the setting time.

  The results are shown in Tables 2-3.

C: The following three types of cement are mixed in equal weight Normal Portland cement (manufactured by Ube Mitsubishi Cement Co., Ltd., specific gravity 3.16)
Ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd., specific gravity 3.16)
Normal Portland cement (Made by Tokuyama Co., Ltd., specific gravity 3.16)
W: Tap water S: Land sand from Kakegawa, Shizuoka Prefecture (fine aggregate, specific gravity 2.57)
Dispersant for hydraulic composition (solid content conversion) See Table 2

  In Table 2, the numerical value in parentheses is% by weight with respect to the component A.

  In Table 3, “addition rate” of the dispersant for hydraulic composition indicates the solid content addition rate of the admixture to the cement. SLF indicates a slump flow.

  As is clear from Table 3, the mortar of each example had a faster J14 funnel flow time after the passage of time, faster time to reach the maximum temperature, and a problem in flow retention performance than the mortars of each comparative example. I understand that there is no. These results show that the dispersant for a hydraulic composition of the present invention can suppress an increase in the viscosity of the hydraulic composition after a lapse of time, can further increase the setting speed, and has excellent flow retention. It shows that it can have performance.

Claims (5)

Structural unit derived from monomer (I) represented by the following general formula (1), structural unit derived from unsaturated monocarboxylic acid monomer (II), unsaturated dicarboxylic acid monomer (III ) And the structural units derived from other monomers (IV) copolymerizable with the monomers (I) to (III), and the weight of each monomer when copolymerized A polycarboxylic acid copolymer having a ratio of 1 ≦ (I) ≦ 97, 1 ≦ (II) ≦ 50, 0.01 ≦ (III) <1, 0 ≦ (IV) ≦ 50 or a salt thereof is contained. Dispersant for hydraulic composition.
R ¹ —O— (A ¹ O) _n1 —R ² (1)
(In the formula, R ¹ represents an alkenyl group having 2 to 5 carbon atoms. A ¹ O is the same or different and represents an oxyalkylene group having 2 to 18 carbon atoms. N1 represents an oxyalkylene group. (The average number of moles added represents a number of 1 to 200. R ² represents a hydrogen atom or a hydrocarbon group having 1 to 30 carbon atoms.)   The dispersant for hydraulic composition according to claim 1, wherein n1 is a number of 1 or more and less than 100.   The dispersant for a hydraulic composition according to claim 1 or 2, wherein the polycarboxylic acid copolymer or a salt thereof has a weight average molecular weight of 5,000 to 30,000 in terms of polyethylene glycol. Copolymerized with the structural unit derived from the monomer (VI) represented by the following general formula (2), the structural unit derived from the monomer (II), and the monomers (VI) and (II) A polycarboxylic acid-based copolymer containing a structural unit derived from another possible monomer (VII) or a salt thereof and / or a structural unit derived from the monomer (I) and the monomer ( II) and a polycarboxylic acid copolymer comprising a structural unit derived from another monomer (VIII) copolymerizable with the monomers (I) and (II) or The dispersant for hydraulic composition according to any one of claims 1 to 3, further comprising a salt.

(In the formula, R ³ , R ⁴ and R ⁵ each independently represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. M represents a number of 0 to ^2. A ² O is the same. Or, differently, it represents an oxyalkylene group having 2 to 18 carbon atoms, n2 is an average addition mole number of the oxyalkylene group, and represents a number of 1 to 200. X is a hydrogen atom or 1 to 1 carbon atoms. Represents 30 hydrocarbon groups.)   The hydraulic composition containing the dispersing agent for hydraulic compositions as described in any one of Claims 1-4.