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Viscosity-reducing type polycarboxylic acid water reducing agent preparation method

A technology of viscous polycarboxylate and water reducer, which is applied in the field of construction admixtures, can solve the problems of polycarboxylate water reducer dispersibility and dispersion retention, increase of concrete viscosity, large consumption of sand and gravel, etc., and achieve improvement Effects of competitive adsorption capacity, hydration film thickness, and large steric hindrance

Active Publication Date: 2019-01-11
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-rise and ultra-high-rise buildings require concrete to reach a certain level of strength. The pumping construction of concrete in high-rise buildings also has high requirements for the workability of concrete. Ratio, increasing the amount of cementitious materials, increasing the proportion of mineral admixtures, etc., but these measures will also cause problems such as increased concrete viscosity and decreased fluidity. agent or use viscosity-reducing polycarboxylate superplasticizer to solve these problems
However, with the rapid increase in the amount of infrastructure projects, the consumption of sand and gravel is huge, the resources of high-quality sand and gravel are getting less and less, and the mud content in sand and gravel is gradually increasing. The amount is very sensitive, which makes the dispersibility and dispersion retention of polycarboxylate superplasticizer decrease

Method used

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  • Viscosity-reducing type polycarboxylic acid water reducing agent preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 40g of ethylene glycol vinyl ether, 80g of 2-butane phosphate-1,2,4-tricarboxylic acid, 1g of concentrated sulfuric acid and 0.1g of hydroquinone into the first reactor equipped with a condensing device. The temperature is kept at 120℃ for 6h, and after the reaction is finished, the temperature is lowered to 40℃, and then the product is mainly 2-butane phosphate-1,2,4-tricarboxylic acid carboxyl group is esterified with a small amount of 2-butane phosphate-1, The carboxyl group in 2,4-tricarboxylic acid is esterified by two esters and three esterified monomers A1.

Embodiment 2

[0027] Add 45g of 4-hydroxybutyl vinyl ether, 80g of 2-butane phosphate-1,2,4-tricarboxylic acid, 0.8g of dibutyltin oxide and 0.1g of p-hydroxyanisole to the first unit equipped with a condenser In the reactor, under the protection of nitrogen, the temperature is kept at 110°C for 6h. After the reaction, the temperature is reduced to 40°C. The product is mainly 2-butane-1,2,4-tricarboxylic acid esterified by a single carboxyl group and a small amount of 2 -Butane phosphate-1,2,4-tricarboxylic acid in which the carboxyl group is esterified by two and three esterified monomers A2.

Embodiment 3

[0029] 65g cyclohexyl-1,4-dimethanol monovinyl ether, 80g 2-phosphobutane-1,2,4-tricarboxylic acid, 0.9g heteropolyacid and 0.1g phenothiazine were added to the condenser equipped with In the first reactor, under the protection of nitrogen, the temperature is kept at 110°C for 6 hours, and the temperature is lowered to 40°C after the reaction is completed. The product in which the carboxyl group of 2-butane-1,2,4-tricarboxylic acid is mainly esterified and A small amount of 2-butane phosphate-1,2,4-tricarboxylic acid has two esterified carboxyl groups and three esterified monomers A3.

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Abstract

The invention discloses a viscosity-reducing type polycarboxylic acid water reducing agent preparation method, which comprises: (1) preparing an esterification monomer; (2) carrying out a copolymerization reaction; and (3) carrying out a neutralization reaction. According to the present invention, the viscosity-reducing type polycarboxylic acid water reducing agent is prepared by co-polymerizing 2-allyloxyethanol, a blend, VPEG, 2-methacryloyloxyethyl phosphorylcholine and an unsaturated acid, such that the phosphate radical, the carboxylate radical, the quaternary ammonium salt and the estergroup are introduced into the molecular structure of the polymer while the polymer structure is lightly cross-linked, wherein the product obtained by the esterification of the single carboxy in 2-phosphonobutane-1,2,4-tricarboxylicacid prepared by a 2-phosphonobutane-1,2,4-tricarboxylicacid esterification reaction, the product obtained by the esterification of the two carboxy in a small amount of2-phosphonobutane-1,2,4-tricarboxylicacid and the product obtained by the esterification of the three carboxy in a small amount of 2-phosphonobutane-1,2,4-tricarboxylicacid form the blend; and the prepared viscosity-reducing type polycarboxylic acid water reducing agent has advantages of viscosity reducing, water reducing, slump retaining and mud resistance, and can solve the problems of high viscosity, poor workability and rapid loss due to the high mud content in the current concrete raw materials.

Description

Technical field [0001] The invention belongs to the technical field of building admixtures, and specifically relates to a preparation method of a viscosity-reducing type polycarboxylic acid water reducer. Background technique [0002] Polycarboxylic acid water reducing agent has the advantages of low dosage, high water reducing rate, strong designability and environmental friendliness, and has become the most widely used concrete admixture. High-rise and super high-rise buildings require concrete to reach a certain level of strength. The pumping construction of high-rise building concrete also has high requirements on the workability of concrete. In order to achieve a higher level of strength, it is generally possible to reduce water ash However, these measures will also increase the viscosity of the concrete and decrease the fluidity of the concrete. At present, it is generally achieved through the use of compound anti-mud agents and air-entraining agents. Or use viscosity-redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F220/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F230/02
Inventor 钟丽娜方云辉林艳梅柯余良李格丽赖广兴赖华珍张小芳
Owner KZJ NEW MATERIALS GROUP CO LTD
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