Polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, applied in the field of concrete admixture, can solve the problem of reducing the use efficiency of air-entraining agent and water reducing agent, reducing the strength and crack resistance of concrete, and incompatibility between air-entraining agent and water reducing agent To achieve the flexible and controllable air-entrained content, improve the anti-permeability and anti-cracking performance, and avoid the effect of concrete delamination

Active Publication Date: 2021-04-20
ZHEJIANG KZJ NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the compounding process of water-entraining agent and air-entraining agent, the problem of incompatibility of air-entraining agent and water-entraining agent usually occurs, which reduces the use efficiency of air-entraining agent and water-entraining agent, resulting in delamination of the prepared concrete, affecting The strength of concrete, and even engineering accidents; and for the calcium lig

Method used

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  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof
  • Polycarboxylate superplasticizer and preparation method thereof

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preparation example Construction

[0059] The present invention also provides a preparation method of polycarboxylate water reducer, comprising the steps of:

[0060] (1) Add pimaric acid type resin acid, p-aminophenol, ethanol and catalyst into the first reaction vessel, raise the temperature to 78°C, and react for 3-5 hours. After the reaction, distill ethanol to obtain unsaturated air-entraining functional mono body;

[0061] Among them, the mass ratio of pimaric acid-type resin acid, p-aminophenol, ethanol and catalyst added is 100: (30-50): 200: (0.1-0.5);

[0062] (2) In parts by weight, add 200 parts of isopentenyl polyoxyethylene ether, 20-80 parts of unsaturated air-entraining functional monomer, 2-10 parts of unsaturated monomer and 200-300 parts of water into the second Mix in the reaction vessel, stir and dissolve, add 0.5-3.0 parts of initiator to the second reaction vessel, heat to 60-85°C; add the first mixed solution and the second mixed solution to the second reaction vessel at the same time, ...

Embodiment 1

[0081] The preparation method of polycarboxylate water reducer comprises the steps:

[0082] (1) In parts by weight, add 100 parts of pimaric acid, 40 parts of p-aminophenol, 200 parts of ethanol and 0.3 part of p-toluenesulfonic acid into the first reaction container, connect the condensing device, heat up to 78 ° C, stir and reflux the reaction After 4 hours, after the reaction was finished, distill ethanol to obtain an unsaturated air-entraining functional monomer;

[0083] (2) In parts by weight, add 200 parts of isopentenyl polyoxyethylene ether (molecular weight: 1200), 30 parts of unsaturated air-entraining functional monomer, 5 parts of acrylic acid and 250 parts of deionized water into the second reaction vessel Mix in medium, heat to 70°C, stir and dissolve, then add 2.5 parts of hydrogen peroxide into the second reaction container; at the same time, drop the first mixed solution and the second mixed solution into the second reaction container, the first mixed soluti...

Embodiment 2

[0086] The preparation method of polycarboxylate water reducer comprises the steps:

[0087] (1) In parts by weight, add 100 parts of isopimaric acid, 45 parts of p-aminophenol, 200 parts of ethanol and 0.3 part of concentrated sulfuric acid into the first reaction vessel, connect the condensing device, heat up to 78 ° C, stir and reflux reaction 4 hour, after the reaction finishes, distill ethanol to obtain unsaturated air-entraining type functional monomer;

[0088] (2) In parts by weight, add 200 parts of isopentenyl polyoxyethylene ether (molecular weight: 2400), 50 parts of unsaturated air-entraining functional monomer, 5 parts of acrylic acid and 250 parts of deionized water into the second reaction vessel Mix in medium, heat to 70°C, stir and dissolve, add 3.0 parts of hydrogen peroxide to the second reaction container; at the same time, drop the first mixed solution and the second mixed solution into the second reaction container, the first mixed solution is at 2.5 Th...

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Abstract

The invention discloses a polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is characterized by being prepared from, by weight, 200 parts of isopentenyl polyoxyethylene ether, 20-80 parts of an unsaturated air-entraining type functional monomer, 12-50 parts of an unsaturated monomer, 0.5-3.0 parts of an initiator, 0.5-2.0 parts of a chain transfer agent, 0.1-1.0 part of a reducing agent; and 300-400 parts of water; wherein the unsaturated air-entraining type functional monomer comprises pimaric acid type resin acid, p-aminophenol, ethanol and a catalyst in a mass ratio of 100: (30-50): 200: (0.1-0.5). The polycarboxylate superplasticizer disclosed by the invention is obtained by free radical copolymerization of the components, and the unsaturated air-entraining functional monomer is introduced into the polycarboxylate superplasticizer, so that the air-entraining function of the polycarboxylate superplasticizer can be effectively improved, the workability of concrete is good, tiny, uniform and stable bubbles are introduced into the concrete, and thus, the permeability resistance and the cracking resistance of the concrete doped with the polycarboxylate superplasticizer are improved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The key to improving the durability of concrete is to improve the permeability and crack resistance of concrete. One of the effective means to improve the anti-permeability and anti-cracking performance of concrete is to introduce a large number of tiny, uniform, closed and stable air bubbles into the concrete to improve the hardened pore structure of the concrete. [0003] The traditional air-entraining method is: compounding water reducer and air-entraining agent during concrete mixing, or modifying water reducer with calcium lignosulfonate with air-entraining function. In the compounding process of water-entraining agent and air-entraining agent, the problem of incompatibility of air-entraining agent and water-entraining agent usually occurs, which reduces the use effic...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F220/70C04B24/26C04B103/30
Inventor 曾贤华徐逸丹凤朱巧勇黄文耀熊浩男朱艳姣于飞宇
Owner ZHEJIANG KZJ NEW MATERIALS CO LTD
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