CN111592272A - Polycarboxylate superplasticizer for machine-made sand concrete prestressed component and preparation method thereof - Google Patents
Polycarboxylate superplasticizer for machine-made sand concrete prestressed component and preparation method thereof Download PDFInfo
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- CN111592272A CN111592272A CN201910856199.0A CN201910856199A CN111592272A CN 111592272 A CN111592272 A CN 111592272A CN 201910856199 A CN201910856199 A CN 201910856199A CN 111592272 A CN111592272 A CN 111592272A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
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Abstract
A polycarboxylate superplasticizer for machine-made sand concrete prestressed members and a preparation method thereof are disclosed, wherein the polycarboxylate superplasticizer is prepared from the following raw materials in parts by mass: 50-100 parts of polyether macromonomer, 20-40 parts of ester macromonomer, 5-15 parts of maleic acid-beta-cyclodextrin, 5-15 parts of styrene, 30-60 parts of acrylic monomer, 10-30 parts of unsaturated phosphate ester and 5-25 parts of ammonium cation unsaturated monomer are prepared into a polymer with the molecular weight of 15000-80000 in a free radical polymerization mode, 0-4 parts of compound organic silicon defoamer, 0-10 parts of early strength agent and 5-15 parts of sacrificial agent are compounded, and then aqueous alkali is added for neutralization. The polycarboxylate superplasticizer provided by the invention has high tolerance on stone powder content of machine-made sand concrete, good water-reducing and viscosity-reducing effects, and an early strength function, and can meet the production requirements of machine-made sand concrete prestressed members in the fields of railways, highways, water conservancy and the like, and especially can be used for preparing high-strength prestressed members with low water-to-gel ratio.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a polycarboxylate superplasticizer for a machine-made sand concrete prestressed component and a preparation method thereof.
Background
Because of the characteristics of seasonal mining of natural river sand and the implementation of mining-limiting policies, river sand resources are seriously in short supply, and the preparation of the concrete prestressed component by using machine-made sand instead of river sand is an effective measure for solving the problem. Compared with river sand, the machine-made sand has coarse particles, obvious edges and corners and contains a certain amount of stone powder, and higher requirements are provided for the water reducing agent for the concrete prestressed member.
The water reducing agent in the concrete prefabricated part has the characteristics of high water reducing rate, good adaptability, obvious early strength effect, short setting time, low shrinkage and creep and the like. The polycarboxylic acids high-efficiency water reducing agent has a comb-shaped structure, and can meet the requirements in a mode of adjusting the polymerization degree of a main chain, the density and the length of a side chain, grafting special groups and the like. Zhang Xinmin et al uses acrylic acid, methoxy polyethylene glycol acrylate with different branched chain lengths and sulfonic acid group monomer to prepare the early-strength quick-setting type polycarboxylate superplasticizer for precast concrete members. The initial setting time and the final setting time of the alkali water agent are 2-3 hours shorter than those of a common slow-setting polycarboxylic acid water reducing agent, the air entraining amount is small, the static curing time of a concrete sample can be shortened, and the early strength of the concrete can be greatly improved within the same steam curing time. Yang bin, root-setting and the like introduce functional groups with early strength functions, such as alcohol amine, amide and the like, into a molecular structure to synthesize a polycarboxylic acid high-performance water reducing agent with early strength effect, and the polycarboxylic acid high-performance water reducing agent and high water reducing agent are mixed according to the weight ratio of 1: 1, the composite material is suitable for prefabrication construction, and the strength can reach more than 100% of the strength design after 7 d.
The stone powder in the machine-made sand has a strong adsorption effect on the polycarboxylate superplasticizer, reduces the adsorption of the stone powder on cement particles, influences the dispersion effect and reduces the application effect of the polycarboxylate superplasticizer. Along with the increase of the content of the stone powder, the dispersibility and the water reducing effect of the polycarboxylic acid water reducing agent are sharply reduced, even the polycarboxylic acid water reducing agent has no dispersing ability and loses the water reducing effect. Moreover, the lithology of the machine-made sand is various, the stone powder with different lithologies has different adsorption capacities on the polycarboxylate water reducer, and the action effect of the polycarboxylate water reducer is greatly fluctuated, so that the use is influenced. Chinese patent CN102659338A, a polycarboxylate superplasticizer suitable for machine-made sand, discloses a polycarboxylate superplasticizer prepared by compounding a water reducer mother liquor, fatty alcohol sulfonate and polyether polyol, and Chinese patent CN102659338A, a concrete admixture and application thereof in concrete containing machine-made sand, discloses an admixture prepared by compounding a polycarboxylate superplasticizer, dipropylamine and sodium hexametaphosphate, wherein the admixture is prepared by simply compounding, adding functional components on the basis of the original water reducer for proper adjustment, and has limited applicability. Chinese patent CN109485323A application of early-strength viscosity-reduction type polycarboxylate superplasticizer in preparation of precast concrete discloses an early-strength viscosity-reduction type polycarboxylate superplasticizer, and the prepared concrete realizes a production process of steam curing-free or pressure curing-free and natural curing at normal temperature, and the turnover period of a mould is shortened. Chinese patent CN102250295A super plasticizer for machine-made sand concrete and preparation method thereof discloses a concrete super plasticizer for machine-made sand and preparation method thereof, which obtains polymer with molecular weight of 10000-65000 by water-soluble free radical copolymerization method. Chinese patent CN103664052A concrete superplasticizer for machine-made sandstone and preparation method thereof discloses a polycarboxylic acid water reducing agent consisting of polycarboxylic acid copolymer, mud-resistant component, crack-resistant component, air entraining agent, defoaming agent and retarder. The machine-made sand concrete with low stone powder content can have a viscosity reduction effect to a certain degree, but the problems that the machine-made sand concrete with high stone powder content is viscous and is difficult to stir and pour can not be effectively solved.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art and provides a polycarboxylate superplasticizer for a machine-made sand concrete prestressed component and a preparation method thereof.
The technical scheme is as follows: in order to achieve the purpose, the invention provides a polycarboxylate superplasticizer for a machine-made sand concrete prestressed component and a preparation method thereof, wherein the polycarboxylate superplasticizer is prepared from the following raw materials in parts by mass: 50-100 parts of polyether macromonomer with the molecular weight of 1000-6000, 20-40 parts of ester macromonomer, 10-40 parts of maleic acid-beta-cyclodextrin, 5-15 parts of styrene, 30-60 parts of acrylic monomer, 10-30 parts of unsaturated phosphate ester and 5-25 parts of ammonium cation unsaturated monomer are prepared into a polymer with the molecular weight of 15000-containing 80000 in a free radical polymerization manner, 0-4 parts of compound air entraining agent, 0-4 parts of organosilicon defoaming agent, 0-10 parts of hardening accelerator and 5-15 parts of sacrificial agent, and then added into aqueous alkali for neutralization.
The polyether macromonomer is one or two of a isobutylene alcohol polyoxyethylene ether macromonomer and a 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer; the ester macromonomer is a methoxy polyethylene glycol unsaturated carboxylic ester macromonomer prepared by esterification reaction of polyethylene glycol monomethyl ether with the molecular weight of 500-2500 and a propionic acid monomer; the acrylic monomer is one or more of acrylic acid, methacrylic acid and maleic anhydride.
The unsaturated phosphate ester is one or two of unsaturated phosphate monoester and unsaturated phosphate diester; the ammonium cation unsaturated monomer is one or more of methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid.
The air entraining agent is one or more of alkyl benzene sulfonate air entraining agents, fatty alcohol sulfonate air entraining agents and lignosulfonate air entraining agents; the hardening accelerator is one or more of sulfate hardening accelerator, nitrite hardening accelerator and triethanolamine; the sacrificial agent is one or two of polyethylene glycol and methoxy polyethylene glycol.
The preparation method of the polycarboxylate superplasticizer for the machine-made sand concrete prestressed component comprises the steps of adding an ether macromonomer, an ester macromonomer, maleic acid- β -cyclodextrin, unsaturated phosphate ester, an ammonium cation unsaturated monomer and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding H once, and stirring until the raw materials are completely dissolved2O2Stirring the solution (30%) for 15min, and then simultaneously dripping A, B liquid, wherein the A liquid is an aqueous solution prepared from styrene, acrylic monomers and deionized water, and the B liquid is an aqueous solution prepared from 3-mercaptopropionic acid, ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; and after the reaction is finished, adding an air entraining agent, an organic silicon defoaming agent, a hardening accelerator and a sacrificial agent, stirring for 1h, and adding a NaOH (30%) solution to neutralize until the pH value is 6-7. .
Has the advantages that: through a large number of experimental researches, the polycarboxylate superplasticizer for the machine-made sand concrete prestressed component provided by the invention has the following excellent performances:
(1) under the condition of high stone powder content, the concrete still has high water reducing effect (the water reducing rate is more than 30 percent) and viscosity reducing effect, has good working performance and is convenient for construction;
(2) the early strength of the concrete is high, the later strength is not reduced, the production progress of the concrete prestressed component and the turnover rate of the template are improved, and the cost is reduced;
(3) the gas content of the concrete is low, and the prepared concrete prestressed member has high strength, smooth appearance quality and no holes;
(4) the prepared concrete prestressed component has low shrinkage and creep;
(5) the method is suitable for machine-made sand concrete with different lithological properties such as limestone, granite, basalt and tuff.
Detailed Description
The following examples are given to illustrate the present invention and are not intended to limit the scope of the present invention.
Example 1
Adding 30 parts of isobutylene polyoxyethylene ether macromonomer, 20 parts of 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer, 20 parts of methoxy polyethylene glycol unsaturated carboxylic ester macromonomer, 10 parts of maleic acid- β -cyclodextrin, 9 parts of unsaturated phosphate monoester, 1 part of unsaturated phosphate diester, 1 part of methacryloyloxyethyl trimethyl ammonium chloride, 1 part of dimethyl diallyl ammonium chloride, 3 parts of 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding 1 part of H at a time, and adding 1 part of H2O2Stirring the solution (30%) for 15min, and then simultaneously dropwise adding A, B liquid, wherein the A liquid is an aqueous solution prepared from 5 parts of styrene, 15 parts of acrylic acid, 10 parts of methacrylic acid, 5 parts of maleic anhydride and deionized water, and the B liquid is an aqueous solution prepared from 0.2 part of 3-mercaptopropionic acid, 0.14 part of ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; after the reaction is finished, 2 parts of polyethylene glycol and 3 parts of methoxy polyethylene glycol are added, stirred for 1 hour, and added with NaOH (30%) solution to neutralize until the pH value is 6-7.
Example 2
Adding 70 parts of isobutylene polyoxyethylene ether macromonomer, 30 parts of 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer, 40 parts of methoxypolyethylene glycol unsaturated carboxylic ester macromonomer, 40 parts of maleic acid- β -cyclodextrin, 25 parts of unsaturated phosphate monoester, 5 parts of unsaturated phosphate diester, 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5 parts of dimethyl diallyl ammonium chloride, 10 parts of 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding 2.8 parts of H in one step2O2Stirring the solution (30%) for 15min, and then simultaneously dropwise adding A, B liquid, wherein the A liquid is an aqueous solution prepared from 15 parts of styrene, 30 parts of acrylic acid, 15 parts of methacrylic acid, 15 parts of maleic anhydride and deionized water, and the B liquid is an aqueous solution prepared from 0.5 part of 3-mercaptopropionic acid, 0.4 part of ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; reaction ofAfter the reaction is finished, 3 parts of an alkylbenzene sulfonate air entraining agent, 1 part of a fatty alcohol sulfonate air entraining agent, 1 part of a lignosulfonate air entraining agent, 4 parts of an organic silicon defoaming agent, 2 parts of a sulfate hardening accelerator, 3 parts of a nitrite hardening accelerator, 5 parts of triethanolamine, 5 parts of polyethylene glycol and 10 parts of methoxy polyethylene glycol are added and stirred for 1 hour, and NaOH (30%) solution is added to neutralize until the pH value is 6-7.
Example 3
Adding 75 parts of 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer, 30 parts of methoxypolyethylene glycol unsaturated carboxylic ester macromonomer, 25 parts of maleic acid- β -cyclodextrin, 18 parts of unsaturated phosphate monoester, 2 parts of unsaturated phosphate diester, 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5 parts of dimethyl diallyl ammonium chloride and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, and adding 1.8 parts of H in one step2O2Stirring the solution (30%) for 15min, and then simultaneously dropwise adding A, B liquid, wherein the A liquid is an aqueous solution prepared from 10 parts of styrene, 30 parts of acrylic acid, 15 parts of methacrylic acid and deionized water, and the B liquid is an aqueous solution prepared from 0.6 part of 3-mercaptopropionic acid, 0.2 part of ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; after the reaction is finished, 1 part of alkylbenzene sulfonate air entraining agent, 1 part of fatty alcohol sulfonate air entraining agent, 2 parts of organic silicon defoaming agent, 2 parts of nitrite hardening accelerator, 3 parts of sulfate hardening accelerator and 10 parts of polyethylene glycol are added and stirred for 1 hour, and NaOH (30%) solution is added for neutralization until the pH value is 6-7.
Example 4
Adding 65 parts of isobutylene polyoxyethylene ether macromonomer, 25 parts of methoxypolyethylene glycol unsaturated carboxylic ester macromonomer, 20 parts of maleic acid- β -cyclodextrin, 12 parts of unsaturated phosphate monoester, 3 parts of unsaturated phosphate diester, 5 parts of methacryloyloxyethyl trimethyl ammonium chloride, 5 parts of 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, and adding 1.5 parts of H in one step2O2Stirring the solution (30%) for 15min, and simultaneously dripping A, B liquid A which is water prepared from 8 parts of styrene, 30 parts of acrylic acid, 10 parts of maleic anhydride and deionized waterThe liquid B is an aqueous solution prepared from 0.3 part of 3-mercaptopropionic acid, 0.3 part of ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; after the reaction is finished, 0.5 part of aliphatic alcohol sulfonate air entraining agent, 0.5 part of lignosulfonate air entraining agent, 1 part of organic silicon defoaming agent, 1 part of sulfate hardening accelerator, 2 parts of triethanolamine and 8 parts of methoxy polyethylene glycol are added and stirred for 1 hour, and NaOH (30%) solution is added to neutralize until the pH value is 6-7.
Example 5
Adding 50 parts of isobutylene polyoxyethylene ether macromonomer, 40 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 35 parts of methoxy polyethylene glycol unsaturated carboxylic ester macromonomer, 30 parts of maleic acid- β -cyclodextrin, 25 parts of unsaturated phosphate monoester, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding 2.1 parts of H in one step2O2Stirring the solution (30%) for 15min, and then simultaneously dropwise adding A, B liquid, wherein the A liquid is an aqueous solution prepared from 13 parts of styrene, 55 parts of acrylic acid and deionized water, and the B liquid is an aqueous solution prepared from 0.4 part of 3-mercaptopropionic acid, 0.3 part of ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; and after the reaction is finished, adding 3 parts of fatty alcohol sulfonate air entraining agent, 3 parts of organosilicon defoaming agent, 7 parts of triethanolamine, 3 parts of polyethylene glycol and 10 parts of methoxy polyethylene glycol, stirring for 1h, and adding NaOH (30%) solution to neutralize until the pH value is 6-7.
Example 6
Adding 60 parts of isobutylene polyoxyethylene ether macromonomer, 20 parts of 4-hydroxybutyl vinyl polyoxyethylene ether, 27 parts of methoxy polyethylene glycol unsaturated carboxylic ester macromonomer, 32 parts of maleic acid- β -cyclodextrin, 10 parts of unsaturated phosphate monoester, 3 parts of unsaturated phosphate diester, 5 parts of dimethyl diallyl ammonium chloride, 4 parts of 2-acrylamide-2-methylpropanesulfonic acid and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding 1.9 parts of H at one time2O2Stirring the solution (30%) for 15min, and simultaneously dripping A, B liquid A containing 11 parts of styrene, 30 parts of acrylic acid and methacrylic acid8 parts of aqueous solution prepared from maleic anhydride 5 parts and deionized water, wherein the liquid B is aqueous solution prepared from 3-mercaptopropionic acid 0.4 part, ascorbic acid 0.3 part and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; after the reaction is finished, 1.5 parts of lignosulfonate air entraining agent, 2.5 parts of organic silicon defoaming agent, 4 parts of sulfate hardening accelerator and 6 parts of polyethylene glycol are added, stirred for 1 hour, and added with NaOH (30%) solution for neutralization until the pH value is 6-7.
The application performance test results of the polycarboxylic acid water reducer for the machine-made sand concrete prestressed member and the commercially available polycarboxylic acid water reducer provided in the embodiments 1 to 6 are shown in the following table, wherein the machine-made sand powder content is 15%, the mud content is 2%, and the concrete water-cement ratio is 0.32.
The result shows that the polycarboxylate superplasticizer disclosed by the invention has excellent applicability to machine-made sand concrete with high stone powder content, can effectively improve the working performance of the machine-made sand concrete, greatly reduces the viscosity of the concrete, improves the workability, has good slump retaining and early strength functions, greatly improves the construction efficiency, and has an effect superior to that of the polycarboxylate superplasticizer for machine-made sand concrete sold in the market.
The embodiments described above are intended to enable those skilled in the art to understand and apply the invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (10)
1. The utility model provides a mechanism sand concrete is polycarboxylate water reducing agent for prestressing force component which characterized in that: the polycarboxylate superplasticizer is prepared from the following raw materials in parts by mass: 50-100 parts of polyether macromonomer with the molecular weight of 1000-6000, 20-40 parts of ester macromonomer, 10-40 parts of maleic acid-beta-cyclodextrin, 5-15 parts of styrene, 30-60 parts of acrylic monomer, 10-30 parts of unsaturated phosphate ester and 5-25 parts of ammonium cation unsaturated monomer are prepared into a polymer with the molecular weight of 15000-containing 80000 in a free radical polymerization manner, 0-4 parts of compound air entraining agent, 0-4 parts of organosilicon defoaming agent, 0-10 parts of hardening accelerator and 5-15 parts of sacrificial agent, and then added into aqueous alkali for neutralization.
2. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the polyether macromonomer is one or two of a isobutylene alcohol polyoxyethylene ether macromonomer and a 4-hydroxybutyl vinyl polyoxyethylene ether macromonomer.
3. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the ester macromonomer is a methoxy polyethylene glycol unsaturated carboxylic ester macromonomer prepared by esterification reaction of polyethylene glycol monomethyl ether with the molecular weight of 500-2500 and a propionic acid monomer.
4. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claims 1 and 3, wherein: the acrylic monomer is one or more of acrylic acid, methacrylic acid and maleic anhydride.
5. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the unsaturated phosphate is one or two of unsaturated phosphate monoester and unsaturated phosphate diester.
6. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the ammonium cation unsaturated monomer is one or more of methacryloyloxyethyl trimethyl ammonium chloride, dimethyl diallyl ammonium chloride and 2-acrylamide-2-methylpropanesulfonic acid.
7. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the air entraining agent is one or more of alkyl benzene sulfonate air entraining agents, fatty alcohol sulfonate air entraining agents and lignosulfonate air entraining agents.
8. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the hardening accelerator is one or more of sulfate hardening accelerator, nitrite hardening accelerator and triethanolamine.
9. The polycarboxylate superplasticizer for machine-made sand concrete prestressed members as claimed in claim 1, wherein: the sacrificial agent is one or two of polyethylene glycol and methoxy polyethylene glycol.
10. The preparation method of the polycarboxylate superplasticizer for the machine-made sand concrete prestressed member according to claims 1-9, characterized by adding ether macromonomer, ester macromonomer, maleic acid- β -cyclodextrin, unsaturated phosphate ester, ammonium cation unsaturated monomer and deionized water into a reaction kettle, introducing nitrogen, stirring until the raw materials are completely dissolved, adding H once2O2Stirring the solution (30%) for 15min, and then simultaneously dripping A, B liquid, wherein the A liquid is an aqueous solution prepared from styrene, acrylic monomers and deionized water, and the B liquid is an aqueous solution prepared from 3-mercaptopropionic acid, ascorbic acid and deionized water; the dropping time of the solution A is 2.5h, the dropping time of the solution B is 3.0h, and the reaction is continued for 1.5h after the dropping is finished; and after the reaction is finished, adding an air entraining agent, an organic silicon defoaming agent, a hardening accelerator and a sacrificial agent, stirring for 1h, and adding a NaOH (30%) solution to neutralize until the pH value is 6-7.
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| CN113214430A (en) * | 2021-04-30 | 2021-08-06 | 北京化工大学 | Styrene-acrylic latex for toughening high-speed railway structural concrete and preparation method thereof |
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