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Preparation method for early-strength polycarboxylate superplasticizer

A polycarboxylate and superplasticizer technology, applied in the field of polycarboxylate superplasticizers, can solve problems such as easy oxidation, affecting product performance, and violent polymerization

Active Publication Date: 2019-09-13
云南森博混凝土外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method is prepared by copolymerization of a large monomer and several small monomers such as methacrylic acid in aqueous solution. This method has the advantages of simple operation and easy access to raw materials, but there are also some shortcomings: in the molecular structure The functional groups and their numbers that can provide electrostatic repulsion and steric hindrance effects are limited; small monomers such as methacrylic acid are prone to oxidation and violent polymerization during the polymerization reaction, which affects the performance of the product

Method used

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  • Preparation method for early-strength polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of preparation method of early-strength polycarboxylate superplasticizer, under normal temperature condition, in 1.5L glass flask, add the TPEG of 400g (brand: Shanghai Taijie Chemical Co., Ltd., TJ- 188), after fully dissolving, add 2g of ammonium persulfate, heat up to 40°C, and then dropwise add acrylic acid, quaternary ammonium salt cationic monomer methacryloyloxyethyltrimethylammonium chloride, N-[ 4-(sulfonamide) phenyl]acrylamide, 2-acrylamido-2-methylpropenesulfonic acid, solution A mixed with deionized water and 2g vitamin C as a reducing agent, 8g thioglycolic acid as a chain transfer agent, deionized water The solution B mixed with ionic water is subjected to aqueous polymerization reaction, and the dropping time is 2 hours. After the dropping is completed, it is heated to 50°C for stirring reaction for 3 hours. After reaching room temperature, the neutralizing agent sodium hydroxide solution is added to adjust the pH to 7. Add water to adjust the sol...

Embodiment 2

[0024] Wherein the mass ratio of TPEG, acrylic acid, methacryloxyethyltrimethylammonium chloride, N-[4-(sulfonamide) phenyl]acrylamide, 2-acrylamide-2-methylpropenesulfonic acid It is 100:3:1:0.5:2, and others are the same as in Example 1.

Embodiment 3

[0026] Wherein the mass ratio of TPEG, acrylic acid, methacryloxyethyltrimethylammonium chloride, N-[4-(sulfonamide) phenyl]acrylamide, 2-acrylamide-2-methylpropenesulfonic acid It is 100:3:1:1:1, and others are the same as in Embodiment 1.

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Abstract

The invention relates to a preparation method for an early-strength polycarboxylate superplasticizer. The early-strength polycarboxylate superplasticizer is mainly prepared from the following components: a polyether macromonomer, (meth)acrylic acid, a quaternary ammonium salt cationic monomer, N-[4-(sulfonamide)phenyl]acrylamide, 2-acrylamido-2-methylpropanesulfonic acid, a chain transfer agent, an initiator, a neutralizer and water. The preparation method of the invention uses the synergistic action of both N-[4-(sulfonamide)phenyl]acrylamide and 2-acrylamido-2-methylpropanesulfonic acid withthe quaternary ammonium salt cationic monomer to achieve optimal early strength effect.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer, in particular to a preparation method of an early-strength polycarboxylate water reducer. Background technique [0002] The early-strength polycarboxylate polymer water-reducer has the advantages of small dosage, high water-reducing rate, and can improve the early strength of concrete. It is a hot research topic at present. The traditional method is prepared by copolymerization of a large monomer and several small monomers such as methacrylic acid in aqueous solution. This method has the advantages of simple operation and easy access to raw materials, but there are also some shortcomings: in the molecular structure The functional groups and their numbers that can provide electrostatic repulsion and steric hindrance effects are limited; small monomers such as methacrylic acid are prone to oxidation and violent polymerization during the polymerization reaction, which affects the performance of the...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/34C08F220/60C08F220/58C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/34
Inventor 马清浩
Owner 云南森博混凝土外加剂有限公司