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Phthalic anhydride-modified polycarboxylic acid water reducing agent and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve problems such as difficulty in meeting performance requirements, reduction of free water content, single function of large monomers, etc., to achieve increased size, enhanced dispersion, enhanced The effect of steric hindrance

Active Publication Date: 2018-12-07
西安亿诺建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As far as the overall development of polycarboxylate superplasticizers is concerned, there is still a big gap between my country and developed countries. The key raw materials for the synthesis of polycarboxylate superplasticizers are fewer varieties of active macromonomers, and the functions of macromonomers are single Or the performance is difficult to meet the requirements of use. At present, most polycarboxylate water reducers are synthesized by copolymerization of ether macromonomers and small monomers such as acrylic acid and maleic anhydride. For example, Chinese patent CN20121043867.0 discloses a The method of preparing polycarboxylate water reducer from raw materials, but the molecular structure of this type of water reducer only has polyoxyethylene side chains. Since polyoxyethylene is easy to form hydrogen bonds with water, and the hydration layer is thick, it will cause environmental pollution. The free water content is reduced, and the dispersion of cement is insufficient and the fluidity is reduced in actual use.

Method used

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  • Phthalic anhydride-modified polycarboxylic acid water reducing agent and preparation method thereof
  • Phthalic anhydride-modified polycarboxylic acid water reducing agent and preparation method thereof
  • Phthalic anhydride-modified polycarboxylic acid water reducing agent and preparation method thereof

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Effect test

Embodiment 1

[0027] A phthalic anhydride modified polycarboxylate water reducer and a preparation method thereof, comprising the following steps:

[0028] a. Weigh phthalic anhydride and methallyl polyoxyethylene ether in a three-necked flask, put a magnetic stirrer, place the three-necked flask on a magnetic stirrer, close the three bottlenecks, and react at 5°C for 5 hours, Obtain phthalic anhydride modified macromonomer;

[0029] b. Weigh reducing agent and chain transfer agent in constant pressure dropping funnel A, weigh methacrylic acid in constant pressure dropping funnel B, add deionized water respectively to make the liquid volumes in constant pressure dropping funnels A and B equal, Gently shake the constant pressure dropping funnels A and B to dissolve the contents of the funnels completely;

[0030] c. Weigh the oxidizing agent and put it into the three-necked flask, put the constant pressure dropping funnels A and B on the left and right sides of the three-necked flask respec...

Embodiment 2

[0039] a. Weigh phthalic anhydride and methallyl polyoxyethylene ether into a three-necked flask, put a magnetic stirrer, place the three-necked flask on a magnetic stirrer, close the three bottlenecks, and react at 50-70°C 4.3h, obtain phthalic anhydride modified macromonomer;

[0040] b. Weigh reducing agent and chain transfer agent in constant pressure dropping funnel A, weigh methacrylic acid in constant pressure dropping funnel B, add deionized water respectively to make the liquid volumes in constant pressure dropping funnels A and B equal, Gently shake the constant pressure dropping funnels A and B to dissolve the contents of the funnels completely;

[0041] c. Weigh the oxidizing agent and put it into the three-necked flask, put the constant pressure dropping funnels A and B on the left and right sides of the three-necked flask respectively, and put the condensation reflux device on the middle-mouthed frame, and place the three-necked flask on a magnetic stirrer, and t...

Embodiment 3

[0051]a. Weigh phthalic anhydride and methallyl polyoxyethylene ether into a three-necked flask, put a magnetic stirrer, place the three-necked flask on a magnetic stirrer, close the three bottlenecks, and react at 64°C for 3.7h , to obtain phthalic anhydride modified macromonomer;

[0052] b. Weigh reducing agent and chain transfer agent in constant pressure dropping funnel A, weigh methacrylic acid in constant pressure dropping funnel B, add deionized water respectively to make the liquid volumes in constant pressure dropping funnels A and B equal, Gently shake the constant pressure dropping funnels A and B to dissolve the contents of the funnels completely;

[0053] c. Weigh the oxidizing agent and put it into the three-necked flask, put the constant pressure dropping funnels A and B on the left and right sides of the three-necked flask respectively, and put the condensation and reflux device on the middle mouth frame, and place the three-necked flask on a magnetic stirrer,...

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Abstract

The invention belongs to the technical field of concrete admixtures and discloses a phthalic anhydride-modified polycarboxylic acid water reducing agent and a preparation method thereof. The method comprises: carrying out esterification on phthalic anhydride and methallyl polyoxyethylene ether at a temperature of 50 to 70 DEG C to obtain a phthalic anhydride-modified macromonomer, carrying out copolymerization on the phthalic anhydride-modified macromonomer and acrylic acid in a redox system at 30-60 DEG C, uniformly stirring the mixture, and adjusting product pH to 6-7 so that a polycarboxylic acid water reducing agent mother liquid containing a phthalic anhydride group is obtained. The preparation method is free of separation purification of the intermediate modified macromonomer and iseasy to operate, the reaction condition is easy to control, the impurities are not introduced, and the synthetic polycarboxylic acid water reducing agent has good dispersibility and good flow retention.

Description

【Technical field】 [0001] The invention belongs to the field of concrete admixtures, in particular to a phthalic anhydride-modified polycarboxylate water reducer and a preparation method thereof. 【Background technique】 [0002] With the construction of large-scale infrastructure such as subways, tunnels, and bridges in my country, the demand for concrete admixtures has increased greatly. As one of the widely used concrete admixtures, polycarboxylate superplasticizers are It has the advantages of high efficiency, good slump retention, strong molecular structure adjustability, green environmental protection, etc., and has good economic benefits. It is currently one of the most important products in the concrete admixture market. [0003] As far as the overall development of polycarboxylate superplasticizers is concerned, there is still a big gap between my country and developed countries. The key raw materials for the synthesis of polycarboxylate superplasticizers are fewer vari...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F4/40C08G65/331C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08G65/331C08F220/06C08F4/40
Inventor 韩再满
Owner 西安亿诺建材科技有限公司
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