Method for preparing ester and ether copolymerized viscosity-reducing polycarboxylic acid water reducing agent

A technology of co-polymerization of viscous polycarboxylate and ester ether, which is applied in the field of construction admixtures, can solve the problems of polycarboxylate superplasticizer dispersibility and dispersion retention, increase of concrete viscosity, and 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: 2019-01-18
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. Additives such as air agent o...

Method used

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  • Method for preparing ester and ether copolymerized viscosity-reducing polycarboxylic acid water reducing agent

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Add 190g of molecular weight 1200 methallyl polyoxyethylene ether, 40g of 2-phosphobutane-1,2,4-tricarboxylic acid, 1.5g of dibutyltin oxide and 0.2g of hydroquinone into a condenser In the first reactor of the device, the temperature was kept at 120°C for 6 hours under the protection of nitrogen, and the temperature was lowered to 40°C after the reaction, and the carboxyl group of 2-phosphobutane-1,2,4-tricarboxylic acid was mainly esterified by a single The carboxyl groups in the product and a small amount of 2-phosphobutane-1,2,4-tricarboxylic acid are double esterified and three esterified products are esterified monomer A1.

Embodiment 2

[0032]200g molecular weight is 2400 methallyl polyoxyethylene polyoxypropylene ether, 20g 2-phosphobutane-1,2,4-tricarboxylic acid, 1.0g concentrated sulfuric acid and 0.1g p-hydroxyanisole In the first reactor of the condensing device, the temperature was kept at 120°C for 6 hours under the protection of nitrogen, and the temperature was lowered to 40°C after the reaction, and the carboxyl group of 2-phosphobutane-1,2,4-tricarboxylic acid was mainly esterified by a single The carboxyl groups in the product and a small amount of 2-phosphobutane-1,2,4-tricarboxylic acid are double esterified and three esterified products are esterified monomer A2.

Embodiment 3

[0034] 200g of molecular weight is 1200 isopentenyl polyoxyethylene ether, 40g of 2-phosphobutane-1,2,4-tricarboxylic acid, 0.9g of heteropoly acid and 0.1g of phenothiazine were added to the first In the reactor, under the protection of nitrogen, keep the temperature at 110°C for 6 hours. After the reaction, the temperature is lowered to 40°C, and the product is mainly 2-phosphobutane-1,2,4-tricarboxylic acid carboxyl group esterified by a single product and a small amount of 2 - The carboxyl group in phosphobutane-1,2,4-tricarboxylic acid is esterified by double esterification and esterification monomer A3 of three esterification products.

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Abstract

The invention discloses a method for preparing an ester and ether copolymerized viscosity-reducing polycarboxylic acid water reducing agent. The method comprises the following steps: (1) esterified monomer preparation; (2) copolymerization; and (3) neutralization. According to the method disclosed by the invention, the ester and ether copolymerized viscosity-reducing polycarboxylic acid water reducing agent is obtained by the copolymerizationan of an esterified monomer, an ester macromonomer, 2-methacryloyl ethyl phosphocholine and unsaturated acid, wherein the esterified monomer is obtained by carrying out esterification on unsaturated polyether and 2-phosphate butane-1, 2, 4-tricarboxylic acid and mainly comprises products obtained by esterifying singe carboxyl in the 2-phosphate butane-1, 2, 4- tricarboxylic acid and esterifying double and three carboxyl in small amount of 2-phosphate butane-1, 2, 4- tricarboxylic acid; and while phosphate radical, carboxylate radical, quaternary ammonium salt and ester group are introduced into a polymer molecular structure, the polymer structure is also lightly crosslinked at the same time. The ester and ether copolymerized viscosity-reducingpolycarboxylic acid water reducing agent prepared by adopting the method disclosed by the invention has the properties of viscosity reducing, water reducing, slump loss resisting and mud resisting tosolve the problems of high viscosity, poor workability and damage rapidness caused by large mud content in conventional concrete raw materials.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of an ester-ether copolymerized viscosity-reducing polycarboxylate water-reducer. Background technique [0002] Polycarboxylate superplasticizer 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 ultra-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. 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. Additives such as air agent or use viscosity-reducing polycarboxylate superplasticizer to solve these prob...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F230/02C08F220/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F230/02C08F220/06
Inventor 钟丽娜方云辉李格丽柯余良赖广兴张小芳赖华珍林艳梅
Owner KZJ NEW MATERIALS GROUP CO LTD
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