CN103408698B - Polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation - Google Patents
Polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation Download PDFInfo
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Abstract
The invention belongs to water-soluble polymer dispersion synthesis technical field, particularly relate to a kind of anionic polyacrylamide water-water dispersion liquid polymerization process.Polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation, it comprises first prepares seed polymer SP by copolyreaction and prepares described polyacrylamide water-water dispersion liquid with the described seed polymer SP of preparation for raw material again, wherein, the molecular weight control of described seed polymer SP is 1.5 × 10
6~ 2.5 × 10
6; Described seed polymer contains the tertiary amine group as reduction group; The oxygenant forming free radical with described reduction group generation redox reaction is contained in raw material prepared by described polyacrylamide water-water dispersion liquid.Thus ensure that the product prepared possesses high workability, high storage stability and high molecular; Do not need special heat transfer and whipping device simultaneously, greatly reduce preparation cost.
Description
Technical field
The invention belongs to water-soluble polymer dispersion synthesis technical field, particularly relate to a kind of anionic polyacrylamide water-water dispersion liquid polymerization process.
Background technology
At present, polyacrylamide industrial process comprises solution polymerization, inverse suspension polymerization and inverse emulsion polymerization.The product that the production method of solution polymerization obtains is powder, except the high viscosity problem in production process, similar with inverse suspension polymerization, owing to finally needing to dry granulation, unavoidably need to introduce drying-granulating equipment, increasing production cost, produce dust in producing simultaneously, also there is problems such as dissolving difficulty in final product.And inverse suspension polymerization and reverse emulsion polymerization aborning a large amount of with an organic solvent and tensio-active agent, itself easily produces secondary pollution to environment.In order to overcome above defect, be developed aqueous dispersion polymerization (aqueous dispersion polymerization, also water-water polymerization or double-aqueous phase polymerization is referred to as) preparation method, this method can direct preparing product and without the need to aftertreatment, production efficiency is high, products therefrom dissolves fast, and itself is environmentally friendly without the need to organic solvent.
Tradition water-water polymerization process, its process key is the polymer chain Precipitation from system timely and effectively that radical polymerization is formed, form primary particle, rapid adsorption stablizer simultaneously, form stable emulsion particle, this post-polymerization respectively external phase and particle mutually in carry out, monomer dynamic assignment between the two phases simultaneously.In the method category, investigators from the shortening phase-splitting time, improve condition of phase separation, improve the aspects such as emulsion particle stability improvement has in various degree been carried out to the synthesis of water-water dispersion liquid, in a certain degree, control the viscosity of final product, improve product stability and dispersion liquid solid content.If the patent No. is CN101649024A(2010-4-21) Chinese patent promote to separate out phase-splitting by adding the copolymerization of esters of acrylic acid hydrophobic monomer, add simultaneously and there is surface-active function monomer, improve early stage stabilization efficiency, dissolve when but product prepared by the method adds water in actual use and become slow, be not suitable for heavy industrialization application; In addition, if the patent No. is CN1519259A(2004-8-11) Chinese patent then by adopting the one package stabilizer of non-ionic type polymer and multicomponent alcoholics compound to improve stabilising effect, still this patent adds the method for carrying out modification by multicomponent alcoholics compound is not clearly for the stabilizing effect improving anion-polyacrylamide.
In aforesaid method reaction early stage process and traditional dispersion polymerization similar, be mainly solution polymerization, but after traditional dispersion polymerization nucleation, because the affinity of monomer and emulsion particle is far away higher than the affinity of monomer and reaction medium, therefore monomer and the oligopolymer overwhelming majority swell in emulsion particle, and transfer reaction is mainly carried out at inside particles, due to the acting in conjunction of gel effect, blanketing effect and enrichment effect, quickly, the molecular weight simultaneously obtaining polymkeric substance is also very high for speed of reaction.But in aqueous dispersion polymerization, monomer and oligopolymer contain a large amount of amide groups, polarity is very large, the affinity of itself and emulsion particle and reaction medium is more or less the same, and because reaction medium amount is much larger than emulsion particle, therefore monomer and oligopolymer part are still present in external phase, this causes three consequences: first monomer is mainly polymerized the oligopolymer of formation in external phase, system viscosity sharply increases, and makes the heat transfer of reaction and stirs more difficult control, needing special polymerization unit; Secondly, a large amount of monomer is present in external phase can delay polymkeric substance precipitation, causes system viscosity in polymerization process to increase further, affects production stability; Again, monomer is less at particle phase interior polymeric proportion, rate of polymerization and molecular weight relatively low.
Summary of the invention
The object of the invention is for solving the problems of the technologies described above, in-situ oxidation reduction initiation is provided to prepare polyacrylamide water-water dispersion liquid, the inventive method is carried out step by step, first the seed polymer of synthesis containing tertiary amine group (as potential reduction group), then this seed polymer is formed seeded dispersion liquid (micron or the particle-stabilised of submicron-scale are scattered in system) by occurring under polymerization conditions to divide to be separated, be polymerized being polymerized required monomer and adding in the seeded dispersion liquid prepared as the component of oxygenant again, effectively to ensure low viscosity and the stability of preparing system in polyacrylamide water-water dispersion liquid preparation process, thus ensure that the product prepared possesses high molecular, high workability and high storage stability, the inventive method does not need special heat transfer and whipping device simultaneously, greatly reduces preparation cost.The present invention for achieving the above object, by the following technical solutions
Polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation, and it comprises following preparation process successively:
1) prepare the raw material that seed polymer SP prepares seed polymer SP and comprise mix monomer, polymerization initiator I
aand deionized water, wherein, described mix monomer is made up of monomer A, monomers B, monomer C and monomer D; The quality of described monomer A accounts for the 60-80% of described mix monomer total mass; The quality of described monomers B accounts for the 10-30% of described mix monomer total mass; The quality of described monomer C accounts for the 5-10% of described mix monomer total mass, and the quality of described monomer D accounts for the 0.05-1% of described mix monomer total mass; Described seed polymer SP is at initiator I by described mix monomer
aand it is obtained after there is copolyreaction cooling under deionized water existent condition; Described initiator I
afor water-soluble azo class initiator, be selected from azo diisobutyl amidine hydrochloride (V-50) or azo two isobutyl imidazoline hydrochloride (VA-044); During described copolyreaction, described mix monomer total mass accounts for 5 ~ 15% of copolyreaction Raw total mass; Described initiator I
aaccount for 0.05 ~ 0.5% of described mix monomer total mass; The temperature of reaction of described copolyreaction controls as 30-50 DEG C, and the reaction times controls as 24-36 hour; Described monomer A is acrylamide or Methacrylamide; Described monomers B be in vinylformic acid, methacrylate, allyl sulphonic acid, 2-acrylamide-2-methylpro panesulfonic acid and their sodium salt one or more; Described monomer C is represented by following general formula 1:
In general formula 1, R
1, R
2separately represent H or CH
3, X represents O, CH
2o, CH
2cH
2o or COO; N=5 ~ 25;
Described monomer D is structure shown in general formula 2 or general formula 3 one or more, wherein, general formula 2 and general formula 3 are expressed as:
In general formula 2 and general formula 3, R
3for H or CH
3, R
5for H or CH
3, R
4, R
6for N (CH
3)
2, N (CH
2cH
3)
2or
The molecular weight control of described seed polymer SP is 1.5 × 10
6~ 2.5 × 10
6.
2) prepare the raw material that polyacrylamide water-water dispersion liquid prepares described polyacrylamide water-water dispersion liquid and comprise seed polymer SP, monomer A, monomers B, inorganic salt E, dispersion stabilizer Stb, oxygenant I
band deionized water; First the seed polymer SP that raw materials quality mark is 5-10% will be accounted for, accounting for raw materials quality mark is 10-20% inorganic salt E, accounting for raw materials quality mark is that 1-3% dispersion stabilizer Stb and deionized water are uniformly mixed 30-40min at 15-40 DEG C, obtain seeded dispersion liquid, then in this seeded dispersion liquid, add monomer A and monomers B and pass into nitrogen, then at same temperature and agitation condition, continue mixing 30-40min, finally add oxygenant I
band react 5 ~ 10 hours at 25-40 DEG C, cool to room temperature is obtained described polyacrylamide water-water dispersion liquid just, and wherein, described inorganic salt E is sodium ion salt, ammonium ion salt or lithium ion salt; The total mass of described monomer A and monomers B accounts for the 10-20% of described raw material total mass; Described monomer A accounts for the 20-80% of monomer A and the total amount of substance of monomers B; Described oxygenant I
bfor Potassium Persulphate, ammonium persulphate or Sodium Persulfate and their arbitrary combination, described in itself and step 1), the mass ratio of monomer D is 2:1 ~ 1:2; Described dispersion stabilizer Stb is comb-grafted copolymer, and the molecular weight of described comb-grafted copolymer is 10000 ~ 100000, and it is represented by following general formula (4):
In general formula (3), R
1for H or CH
3, R
2for H or CH
3, R
7for H or CH
3; X is O, CH
2o, CH
2cH
2o or COO; M is H or basic metal or alkaline-earth metal ions; A:b:c=(2.5 ~ 7.5): (2.5 ~ 5): 1; N value is 5 ~ 25.
The preparation method of dispersion agent of the present invention can see patent CN103059216A (2013-04-24): obtain described comb-grafted copolymer by the copolyreaction of three kinds of monomer generation free radical additions, described three kinds of monomers are: 2-acrylamide-2-methylpro panesulfonic acid (general formula 4), and monomer shown in general formula of the present invention 2 and general formula 5;
Monomer C-structure of the present invention is as shown in general formula 1, its Main Function is as the reactive space protection monomer of one, help the emulsion particle stability that raising seed polymer SP is formed after next step phase-splitting, a point phase reagent inorganic salt E consumption can be reduced simultaneously, but monomer C consumption is unsuitable too many, otherwise the dispersion stabilizer Stb easily causing emulsion particle not easily to adsorb next step adding, makes emulsion particle stability decline on the contrary; Therefore the used in amounts of monomer C will will keep rational proportioning meeting under other control condition with the used in amounts of inorganic salt E and dispersion stabilizer Stb, in the present invention, the consumption of monomer C and inorganic salt E and dispersion stabilizer Stb is through studying gained for a long period of time according to the present inventor, this ratio not only can reduce the consumption of inorganic salt E, can also ensure that the performance that product of the present invention is final simultaneously.In addition, monomer D of the present invention is the one or several arbitrarily of structure shown in general formula 2 or general formula 3, and its Main Function is to provide the tertiary amine group with reductibility, and the oxygenant added with subsequent step forms redox system, its consumption cross at least produce free radical few, reaction conversion ratio is lower; Consumption crosses the probability that can add polymeric monomer at most and be polymerized in external phase, and simultaneously product props up rate and crosslinking rate improves, and is unfavorable for the practical application of product, therefore monomer D consumption according to the present inventor through studying for a long period of time be ensure that quality product of the present invention.
In the present invention, the preparation feedback of product carries out in two steps, the unsaturated monomer copolymerization containing tertiary amine group of minute quantity is introduced in seed polymer by this reaction first stage, separate out into tertiary amine group after particle until it and be just fixed on inside particles, now add second batch monomer again, and micro amount of oxygen agent is as (Potassium Persulphate) KPS, (ammonium persulphate) APS etc., oxygenant is by diffusing into inside particles, redox system will be formed with tertiary amine group, free radical is produced in inside particles original position, and consume inside particles monomer and carry out transfer reaction, simultaneously in particle phase and external phase, the swelling equilibrium of monomer is broken, monomer constantly will diffuse into particle phase from external phase, until monomer completely consumed in external phase.This is equivalent to the monomer droplet warehouse in letex polymerization to become using whole external phase as monomer warehouse, be the polymerization unit transferring raw material of inside particles continually, because the initiator system of polymerization is fixed on inside particles, therefore polyreaction is also limited in inside particles, so just effectively can reduce the viscosity of system in polymerization process.
The molecular weight control of seed polymer SP is 1.5 × 10 by the present invention
6~ 2.5 × 10
6if molecular weight is too little, phase-splitting is comparatively difficult, needs to add more inorganic salt; Molecular weight is too high, easily forms gel when preparing seed polymer.Therefore, in seed polymer SP building-up process, contriver is by the conservative control to synthesis material composition and proportioning and synthesis condition, and being interacted under certain condition by these materials and reacting forms molecular weight required for the present invention 1.5 × 10
6~ 2.5 × 10
6seed polymer SP, to meet the demand of follow-up synthesis polyacrylamide water-water dispersion liquid, and then ensure the quality of the finished product.In addition, follow-up prepare polyacrylamide water-water dispersion liquid time, by the conservative control of the selection of step seed polymer SP and other composition before, rational proportion and synthesis condition, and interacted under certain condition by these materials and react and form the product that the present invention finally possesses high workability (viscosity is 97cP), high storage stability (25 DEG C are greater than 12 months-) and high molecular (up to 1,960 ten thousand).
The present invention have employed in-situ oxidation reduction and causes preparation method in seed polymer SP preparation process, by tertiary amine group being fixed on the inside particles that seed polymer SP separates out, add second batch monomer and micro amount of oxygen agent again as (Potassium Persulphate) KPS, (ammonium persulphate) APS etc., now oxygenant is by diffusing into inside particles, redox system will be formed with tertiary amine group, produce free radical in inside particles original position and consume inside particles monomer and carry out transfer reaction, simultaneously in particle phase and external phase, the swelling equilibrium of monomer is broken, monomer constantly will diffuse into particle phase from external phase, until monomer completely consumed in external phase.The method can improve speed of reaction and molecular weight product simultaneously.
Finally, the present invention is owing to adopting substep to control and in-situ oxidation reduces the method combined, namely free radical is produced in inside particles original position, locus of polymerization is mainly at inside particles, and therefore, whole reaction process viscosity is low, good fluidity, do not need special heat transfer and whipping device, therefore cost of manufacture and difficulty reduce greatly, facilitate large industrial production; The product simultaneously produced by method of the present invention is greatly improved due to over-all properties, therefore expands the use range of anionic polyacrylamide water-water dispersion liquid.
The preparation method of seed polymer of the present invention is in order to reach the effect of product of the present invention, therefore, although the method is conventional means in polymer chemistry synthesis field, this technology is converted in the preparation of anionic polyacrylamide water-water dispersion liquid does not have report.In addition, in the preparation of cationic polyacrylamide water-water dispersion liquid, the difficulty of this technology is used to be different from object and other Polymer Synthesizing fields.In addition, contriver just obtains effect of the present invention through long-term experiment research, namely needs the molecular weight being controlled described seed polymer SP prepared by the present invention by strict technique means to be 1.5 × 10
6~ 2.5 × 10
6the control of this molecular weight does not have in other field, can using in the preparation of anionic polyacrylamide water-water dispersion liquid without any the enlightenment in other field and reach effect of the present invention, neither limited number of time experiment can reach, be not more the conventional means of those skilled in the art yet.
The preparation method of anionic polyacrylamide water-water dispersion liquid of the present invention may be used in the process of any production anionic polyacrylamide water-water dispersion liquid, and the preferred embodiment cited by the present invention is the preferred embodiment of the present inventor through the gained that studies for a long period of time.
As preferably, the temperature of reaction of copolyreaction described in step 1) controls as 35-40 DEG C.
As preferably, the reaction times of copolyreaction described in step 1) controls as 24-28 hour.
As preferably, step 2) described in when stirring stir speed (S.S.) be 150-300r/min.
As preferably, described inorganic salt E is ammonium sulfate, sodium sulfate, Lithium Sulphate, sodium-chlor, ammonium chloride, Trisodium Citrate or sodium tartrate and their arbitrary combination.
The invention has the beneficial effects as follows:
1, in the present invention, the preparation feedback of product carries out in two steps, the unsaturated monomer copolymerization containing tertiary amine group of minute quantity is introduced in seed polymer by this reaction first stage, separate out into tertiary amine group after particle until it and be just fixed on inside particles, now add second batch monomer again, and micro amount of oxygen agent is as (Potassium Persulphate) KPS, (ammonium persulphate) APS etc., oxygenant is by diffusing into inside particles, redox system will be formed with tertiary amine group, free radical is produced in inside particles original position, and consume inside particles monomer and carry out transfer reaction, so just effectively can reduce the viscosity of system in polymerization process, improve speed of reaction and molecular weight product simultaneously.
2, inventor is by the conservative control to synthesis material composition and proportioning and synthesis condition, is 1.5 × 10 by the molecular weight control of seed polymer SP
6~ 2.5 × 10
6the seed polymer SP of this molecular weight can meet the demand of follow-up synthesis polyacrylamide water-water dispersion liquid, and then ensures that namely the quality of the finished product possesses high workability (viscosity is 97cP), high storage stability (25 DEG C are greater than 12 months) and high molecular (up to 19,600,000).
3, the present invention combines owing to adopting substep control method to reduce with in-situ oxidation, namely free radical is produced in inside particles original position, locus of polymerization is mainly at inside particles, whole reaction process viscosity is low, good fluidity, do not need special heat transfer and whipping device, therefore cost of manufacture and difficulty reduce greatly, facilitate large industrial production; The product simultaneously produced by method of the present invention is greatly improved due to over-all properties, therefore expands the use range of anionic polyacrylamide water-water dispersion liquid.
4, in each reactions steps of the present invention, raw materials used composition, proportioning and processing step are all that the present inventor is through studying gained for a long period of time, each processing step closely cooperates and is mutually connected interaction, the consumption of monomer C especially of the present invention and monomer D controls, be affect the present invention to be polymerized successful essential condition, itself and other control condition combine the effect reached described in product of the present invention.
Embodiment
This specific embodiment is only explanation of the invention; it is not limitation of the present invention; those skilled in the art can make to the present embodiment the amendment not having creative contribution as required after reading this specification sheets, as long as but be all subject to the protection of patent law in right of the present invention.
Concrete enforcement is divided into two portions, first prepares seed polymer SP and dispersion stabilizer Stb by synthesis example, then prepares anionic polyacrylamide water-water dispersion liquid by embodiment.In synthesis example and embodiment, raw materials used and code name is shown in Table 1.
In synthesis example of the present invention, the molecular weight of seed polymer and dispersion agent uses aqueous gel permeation chromatography (GPC) to measure.Condition determination is as follows:
Gel column: Shodex SB806+803 two root chromatogram column is connected
Eluant: 0.1M NaNO
3solution
Moving phase speed: 1.0ml/min
Injection: the 20 μ l0.5% aqueous solution
Detector: Shodex RI-71 type differential refraction detector
Standard substance: polyoxyethylene glycol GPC standard specimen (Sigma-Aldrich, molecular weight 1010000,478000,263000,118000,44700,18600,6690,1960,628,232)
Raw materials used and code name in table 1 synthesis example and embodiment
| Material name | Be called for short |
| Acrylamide | A-1 |
| Methacrylamide | A-2 |
| Vinylformic acid | B-1 |
| Methacrylic acid | B-2 |
| Sodium allyl sulfonate | B-3 |
| 2-acrylamide-2-methylpro panesulfonic acid | B-4 |
| Allyl polyether (n=5) | C-1 |
| Methoxy poly (ethylene glycol) monomethacrylates (n=10) | C-2 |
| Allyl polyether (n=20) | C-3 |
| Methoxy poly (ethylene glycol) mono acrylic ester (n=25) | C-4 |
| DMAM | D-1 |
| DMMAM | D-2 |
| DEAM | D-3 |
| DMAEMA | D-4 |
| DEAEMA | D-5 |
| PREMA | D-6 |
| Ammonium sulfate | E-1 |
| Sodium sulfate | E-2 |
| Lithium Sulphate | E-3 |
| Sodium-chlor | E-4 |
| Ammonium chloride | E-5 |
| Trisodium Citrate | E-6 |
| Sodium tartrate | E-7 |
| Azo diisobutyl amidine hydrochloride (V-50) | I a-1 |
| Azo two isobutyl imidazoline hydrochloride (VA-044) | I a-2 |
| Potassium Persulphate (KPS) | I b-1 |
| Ammonium persulphate (APS) | I b-2 |
| Sodium Persulfate (SPS) | I b-3 |
The synthesis of synthesis example A1(seed polymer SP1)
In the glass reactor that thermometer, agitator, nitrogen ingress pipe and reflux exchanger are housed, add 15 grams (A-1), 7.5 grams (B-1), 2.5 grams (C-1), 1.25 milligrams (D-1) and 475 grams of deionized waters, stir while use nitrogen purging reaction vessel, and be warming up to 40 DEG C, then add 1.25 milligrams of (I
a-1), insulation reaction was cooled to room temperature after 30 hours, obtained seed polymer SP1.
The synthesis of synthesis example A2-A12(seed polymer SP1-SP12)
Prepare SP1-SP12 of the present invention according to the step of synthesis example A1, feed intake according to the ratio described by table 2.
The ingredient proportion of table 2 seed polymer SP and molecular weight
The synthesis of synthesis example B1(dispersion agent Stb1)
Thermometer is being housed, agitator, dropping funnel, in the glass reactor of nitrogen ingress pipe and reflux exchanger, add 100 ml deionized water, stir while use nitrogen purging reaction vessel, and be warming up to 75 DEG C, then by 30 grams (B-4) and 7 grams (B-1) and 5 grams (C-1) and 80 milliliters, water, make the mix monomer aqueous solution, instilled reactor, time for adding is 2 hours, and drip 10% ammonium persulfate initiator solution 20 grams simultaneously, time for adding is 5 hours, dropwise rear insulation reaction and be cooled to room temperature in 5 hours, obtain dispersion agent Stb1, its molecular weight is 15000.
The synthesis of synthesis example B2-B4(dispersion agent Stb2-Stb4)
Prepare Stb2-Stb4 of the present invention according to the step of synthesis example B1, feed intake according to the ratio described by table 3.
Ingredient proportion prepared by table 3 dispersion agent Stb and molecular weight
Embodiment
Embodiment is the synthetic method of anionic polyacrylamide water-water dispersion liquid (APD) of the present invention.
In the embodiment of the present invention, the molecular weight of all anionic polyacrylamide water-water dispersion liquids adopts viscosity method to measure according to GB17514-2008.Must process sample before mensuration, to remove inorganic salt in sample and the complete monomer of unreacted, concrete treating processes is as follows: by soluble in water for anionic polyacrylamide water-dispersion breast, be made into the aqueous solution that mass concentration is 2%, then be poured in aqueous ethanolic solution (volume ratio of dehydrated alcohol and the aqueous solution is 3:1) and be settled out polymkeric substance, then use washing with acetone.This process in triplicate, then by throw out vacuum-drying at 40 DEG C.The monitoring of polymerization process medium viscosity is every 15min syringe abstraction reaction liquid, with SNB AI intelligence Brookfield viscometer, No. 27 rotors measure cloth network gram Field (Brookfield) viscosity under 30RPM, the peak viscosity of assaying reaction and product final viscosity.
The synthesis of embodiment 1(APD1)
In the glass reactor that thermometer, agitator, nitrogen ingress pipe and reflux exchanger are housed, add 25 grams (SP1), 75 grams (E-1) and 5 grams (E-4), 5 grams (Stb1) and 340 grams of deionized waters, stir and fully mix 30min at 37 DEG C, and stir speed (S.S.) is 300r/min, then add 40 grams (A-1) and 10 grams (B-1), logical nitrogen, is incubated 35 DEG C and continues mixing 35min, add 2.5 milligrams of initiator I
b-1, insulation reaction was cooled to room temperature after 8 hours, obtained anionic polyacrylamide water-water dispersion liquid APD1.
The synthesis of embodiment 2-12(APD2-APD12)
Prepare APD2-APD12 of the present invention according to the step of embodiment 1, feed intake according to the ratio described by table 4, relevant nature is in table 5.
Table 4 water-water dispersion liquid prepares each reactant ingredient proportion
The sign of table 5 polyacrylamide water-water dispersion liquid
Attached: the chemical structure of tertiary amine monomers and title
。
Claims (5)
1. polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation, it is characterized in that: it comprises following preparation process successively:
1) prepare the raw material that seed polymer SP prepares seed polymer SP and comprise mix monomer, polymerization initiator I
aand deionized water, wherein, described mix monomer is made up of monomer A, monomers B, monomer C and monomer D; The quality of described monomer A accounts for the 60-80% of described mix monomer total mass; The quality of described monomers B accounts for the 10-30% of described mix monomer total mass; The quality of described monomer C accounts for the 5-10% of described mix monomer total mass, and the quality of described monomer D accounts for the 0.05-1% of described mix monomer total mass; Described seed polymer SP is at initiator I by described mix monomer
aand it is obtained after there is copolyreaction cooling under deionized water existent condition; Described initiator I
afor water-soluble azo class initiator, be selected from azo diisobutyl amidine hydrochloride (V-50) or azo two isobutyl imidazoline hydrochloride (VA-044); During described copolyreaction, described mix monomer total mass accounts for 5 ~ 15% of copolyreaction Raw total mass; Described initiator I
aaccount for 0.05 ~ 0.5% of described mix monomer total mass; The temperature of reaction of described copolyreaction controls as 30-50 DEG C, and the reaction times controls as 24-36 hour; Described monomer A is acrylamide or Methacrylamide; Described monomers B be in vinylformic acid, methacrylic acid, allyl sulphonic acid, 2-acrylamide-2-methylpro panesulfonic acid and their sodium salt one or more; Described monomer C is represented by following general formula 1:
In general formula 1, R1, R2 separately represent H or CH
3, X represents O, CH
2o, CH
2cH
2o or COO; N=5 ~ 25;
Described monomer D is structure shown in general formula 2 or general formula 3 one or more, wherein, general formula 2 and general formula 3 are expressed as:
In general formula 2 and general formula 3, R
3for H or CH
3, R
5for H or CH
3, R
4, R
6for N (CH
3)
2, N (CH
2cH
3)
2or
The molecular weight control of described seed polymer SP is 1.5 × 10
6~ 2.5 × 10
6;
2) prepare the raw material that polyacrylamide water-water dispersion liquid prepares described polyacrylamide water-water dispersion liquid and comprise seed polymer SP, monomer A, monomers B, inorganic salt E, dispersion stabilizer Stb, oxygenant I
band deionized water; First the seed polymer SP that raw materials quality mark is 5-10% will be accounted for, accounting for raw materials quality mark is 10-20% inorganic salt E, accounting for raw materials quality mark is that 1-3% dispersion stabilizer Stb and deionized water are uniformly mixed 30-40min at 15-40 DEG C, obtain seeded dispersion liquid, then in this seeded dispersion liquid, add monomer A and monomers B and pass into nitrogen, then at same temperature and agitation condition, continue mixing 30-40min, finally add oxygenant I
band react 5 ~ 10 hours at 25-40 DEG C, cool to room temperature is obtained described polyacrylamide water-water dispersion liquid just, and wherein, described inorganic salt E is sodium ion salt, ammonium ion salt or lithium ion salt; The total mass of described monomer A and monomers B accounts for the 10-20% of described raw material total mass; Described monomer A accounts for the 20-80% of monomer A and the total amount of substance of monomers B; Described oxygenant I
bfor Potassium Persulphate, ammonium persulphate or Sodium Persulfate and their arbitrary combination, itself and step 1) described in the mass ratio of monomer D be 2:1 ~ 1:2; Described dispersion stabilizer Stb is comb-grafted copolymer, and the molecular weight of described comb-grafted copolymer is 10000 ~ 100000, and it is represented by following general formula (4):
In general formula (4), R
1for H or CH
3, R
2for H or CH
3, R
7for H or CH
3; X is O, CH
2o, CH
2cH
2o or COO; M is H or basic metal or alkaline-earth metal ions; A:b:c=(2.5 ~ 7.5): (2.5 ~ 5): 1; N value is 5 ~ 25.
2. polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation as claimed in claim 1, it is characterized in that: step 1) temperature of reaction of described copolyreaction controls as 35-40 DEG C.
3. polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation as claimed in claim 1, it is characterized in that: step 1) reaction times of described copolyreaction controls as 24-28 hour.
4. polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation as claimed in claim 3, it is characterized in that: step 2) described in when stirring stir speed (S.S.) be 150-300r/min.
5. polyacrylamide water-water dispersion liquid is prepared in in-situ oxidation reduction initiation as claimed in claim 4, it is characterized in that: described inorganic salt E is ammonium sulfate, sodium sulfate, Lithium Sulphate, sodium-chlor, ammonium chloride, Trisodium Citrate or sodium tartrate and their arbitrary combination.
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| CN103772599B (en) * | 2013-12-06 | 2016-02-03 | 江苏苏博特新材料股份有限公司 | A kind of seed polymer and stablizer and apply its low viscosity method preparing polyacrylamide copolymer water-water dispersion liquid |
| CN111333789B (en) * | 2020-04-26 | 2022-03-18 | 江苏苏博特新材料股份有限公司 | Preparation method of microcapsule type polycarboxylate superplasticizer with high-temperature long-term slump retaining performance |
| CN111909306B (en) * | 2020-08-14 | 2022-05-31 | 西安石油大学 | Double-aqueous-phase PAM/AMPS nano microsphere latex as well as preparation method and application thereof |
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| EP2463317A1 (en) * | 2010-12-09 | 2012-06-13 | BASF Construction Polymers GmbH | Additive for construction material mixtures containing a fluid phase |
| CN103044622B (en) * | 2012-10-30 | 2015-01-07 | 江苏苏博特新材料股份有限公司 | Preparation method of water-in-water type cationic polyacrylamide emulsion |
| CN103059216B (en) * | 2012-11-27 | 2015-10-07 | 江苏苏博特新材料股份有限公司 | A kind of dispersion agent, its preparation method and the application in anionic polyacrylamide water-dispersible emulsion polymerization thereof |
| CN103012668B (en) * | 2012-12-11 | 2014-10-29 | 江苏苏博特新材料股份有限公司 | Preparation method of cationic polyacrylamide water-in-water emulsion |
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