A kind of preparation method of anti-mud-shrinkage polycarboxylate superplasticizer

A technology of water reducing agent and polycarboxylic acid, applied in the field of concrete additives

Active Publication Date: 2020-07-07
广西壮族自治区水利科学研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems existing in the existing concrete water reducer, the present invention provides a mud-resistant and shrinkage-reducing polycarboxylate water reducer and its preparation method

Method used

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  • A kind of preparation method of anti-mud-shrinkage polycarboxylate superplasticizer
  • A kind of preparation method of anti-mud-shrinkage polycarboxylate superplasticizer
  • A kind of preparation method of anti-mud-shrinkage polycarboxylate superplasticizer

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Experimental program
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Effect test

Embodiment 1

[0032] A preparation method of mud-resistant-shrinkage-reducing polycarboxylate water-reducer, comprising the following steps:

[0033] S1: Synthesis of snowflake-shaped anti-mud macromonomer: 100g of phytic acid solution with a concentration of 70%, 0.15g of hydroquinone polymerization inhibitor, and 3.64g of p-toluenesulfonic acid catalyst were added to the reaction vessel, stirred evenly, and heated to 50°C, add 51.33g of vinyl glycol ether into the reaction container dropwise in 4 times for 2 hours, stir well, when the temperature rises to 150°C, carry out the heat preservation reaction, the reaction time is 4h, and cool down after the reaction To normal temperature, the snowflake-shaped anti-mud macromonomer is obtained;

[0034] S2: Synthesis of anti-mud-shrinkage polycarboxylate water-reducer: 54.0 g of the product snowflake-shaped anti-mud macromonomer obtained in step S1, sodium methacrylate sulfonate 15.8 g, propylene polyoxyethylene ether (molecular weight= 1000) 1...

Embodiment 2

[0036] A preparation method of mud-resistant-shrinkage-reducing polycarboxylate water-reducer, comprising the following steps:

[0037] S1: Synthesis of snowflake-shaped anti-mud macromonomer: add 100g of phytic acid solution with a concentration of 70%, 0.56g of hydroquinone polymerization inhibitor, and 5.67g of concentrated sulfuric acid catalyst into the reaction vessel, stir evenly, and heat up to 50°C , add the weighed 56.0g vinyl glycol ether into the reaction vessel dropwise in 4 times for 2 hours, stir well, when the temperature rises to 140°C, carry out the heat preservation reaction, the reaction time is 5h, after the reaction, cool to room temperature , to obtain a snowflake-shaped anti-mud macromonomer;

[0038] S2: Synthesis of anti-mud-shrinkage polycarboxylate superplasticizer: 54.0 g of the product snowflake-shaped anti-mud macromonomer obtained in step S1, 11.85 g of allyl sodium sulfonate, and methallyl polyoxyethylene ether (Molecular weight = 2000) 200g, ...

Embodiment 3

[0040] A preparation method of mud-resistant-shrinkage-reducing polycarboxylate water-reducer, comprising the following steps:

[0041] S1: Synthesis of snowflake-shaped anti-mud macromonomer: 100g of phytic acid solution with a concentration of 70%, 1.21g of hydroquinone polymerization inhibitor, and 1.96g of p-toluenesulfonic acid catalyst were added to the reaction vessel, stirred evenly, and heated to 50°C, add 60.67g of vinyl glycol ether into the reaction vessel dropwise in 2 times for 2 hours, stir well, and when the temperature rises to 180°C, carry out the heat preservation reaction, the reaction time is 3h, and cool down after the reaction To normal temperature, the snowflake-shaped anti-mud macromonomer is obtained;

[0042] S2: Synthesis of anti-mud-shrinkage-reducing polycarboxylate superplasticizer: 54.0 g of the snowflake-shaped anti-mud macromonomer obtained in step S1, 3.95 g of sodium methacrylate, allyl block polyether+propylene Base polyoxyethylene ether (...

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Abstract

The invention discloses a preparation method of an anti-clay and shrinkage-reducing type polycarboxylate superplasticizer. Phytic acid, unsaturated alcohol ether, a polymerization inhibitor and a catalyst are added to a reaction vessel, uniformly stirred, heated to 80-200 DEG C and subjected to an esterification reaction for 1-12 h, a product I obtained after the reaction is cooled to room temperature, and a snowflake-like anti-clay macromonomer is obtained; the snowflake-like anti-clay macromonomer and solvent water are added to the reaction vessel, then a polyether macromonomer, unsaturatedcarboxylic acid, an unsaturated derivative and an initiator are added to the reaction vessel, uniformly stirred, heated to 50-100 DEG C and subjected to a reaction for 1-12 h, a product II obtained after the reaction is cooled to room temperature, alkali is added to regulate pH to 6.5-7.5, and the polycarboxylate superplasticizer is obtained. The polycarboxylate superplasticizer has excellent anti-clay, water-reducing and shrinkage-reducing effects and good dispersity, thereby having good application prospect and market competitiveness in the field of water reducers. The preparation method further has the advantages that the synthesis process is simple, safe, environmentally friendly, non-toxic, harmless, clean and pollution-free, industrial production is realized easily, and the method has good social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of concrete additives, in particular to a preparation method of an anti-mud-shrinkage polycarboxylate water reducer. Background technique [0002] Since the beginning of the 21st century, the use of polycarboxylate superplasticizers in my country has been increasing, and it has become the country with the largest use. As a high-performance admixture with excellent performance, polycarboxylate superplasticizer is widely used in high-performance concrete and green concrete, but it is easily adsorbed by clay minerals such as montmorillonite, kaolinite, illite, sea foam, etc. , in kaolinite, illite, sepiolite only surface adsorption occurs, in montmorillonite not only surface adsorption but also interlayer adsorption occurs, and the interlayer adsorption of montmorillonite is polycarboxylate superplasticizer The main factor of molecular failure has become a difficult problem in the use of polycarboxylate superp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F230/02C08F228/02C08F220/06C04B24/24C07F9/117C04B103/30
CPCC04B24/246C04B2103/302C07F9/117C08F230/02C08F283/065
Inventor 陈建国张世城李林郭晋川黄旭生刘鲁强彭华娟周立新吴光军陈树亮杨建坤
Owner 广西壮族自治区水利科学研究院
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