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Polycarboxylate water reducer and preparation method thereof

A technology of water reducer and polycarboxylate, applied in the field of polycarboxylate water reducer and its preparation, can solve the problems of susceptibility and poor adaptability of cement, etc., achieve simple production method, improve adaptability, and overcome sensitivity problems Effect

Inactive Publication Date: 2019-01-22
中建西部建设新疆有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a polycarboxylate water reducer and its preparation method, which aims to improve the existing polycarboxylate water reducer to some cement poor adaptability, sensitivity and other problems

Method used

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  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0026] A preparation method of polycarboxylate water reducer, mainly comprising:

[0027] Esterification of unsaturated phosphonic acid monomers with maleic anhydride to obtain esterified products;

[0028] Mix the initiator, polyoxyethylene ether macromonomer and esterification product, add molecular weight modifier aqueous solution and acrylic acid aqueous solution, and keep reacting at 50-60°C for 1-3 hours;

[0029] Among them, the molar ratio of unsaturated phosphonic acid monomer to maleic anhydride is 1:1-3; the mass ratio of polyoxyethylene ether macromer to esterification product is 100:15-20;

[0030] The mass ratio of polyoxyethylene ether macromonomer to acrylic acid is 100:2-5;

[0031] The mass ratio of polyoxyethylene ether macromer to initiator is 100:0.7-1;

[0032] The mass ratio of the polyoxyethylene ether macromonomer to the molecular weight regulator is 100:0.2-0.5.

[0033] The unsaturated phosphonic acid monomer is esterified with maleic anhydride, a...

Embodiment 1

[0047] This embodiment provides a polycarboxylate water reducer, which is mainly prepared through the following steps:

[0048] Add 66.68 parts of unsaturated phosphonic acid monomers and 7.8 parts of maleic anhydride into a three-necked flask equipped with a thermometer, a stirrer, and a reflux condenser, heat to 60°C, reflux, stir, and react for 3 hours; the esterification product is obtained DTP-1.

[0049] Add 100.00 parts of polyoxyethylene ether macromonomer, 18.71 parts of esterification product (DT-P1) and 105 parts of water into a four-necked flask equipped with a stirrer and a thermometer; stir and heat up to 50°C, add 0.9 parts of persulfuric acid Ammonium; 0.305 parts of thioglycolic acid and 53 parts of water are made into a mixed solution (A), 3.75 parts of acrylic acid and 45 parts of water are made into a mixed solution (B); at the same time, the mixed solutions A and B are added dropwise, and the A solution is dripped for 3.5 hours After the addition, the tem...

Embodiment 2

[0053] This embodiment provides a polycarboxylate water reducer, which is mainly prepared through the following steps:

[0054] Add 66.68 parts of unsaturated phosphonic acid monomers and 15.6 parts of maleic anhydride into a three-necked flask equipped with a thermometer, a stirrer, and a reflux condenser, heat to 60°C, reflux, stir, and react for 3 hours; the esterification product is obtained DTP-2.

[0055]Add 100.00 parts of polyoxyethylene ether macromonomer, 18.71 parts of esterification product (DTP-2) and 105 parts of water into a four-necked flask equipped with a stirrer and a thermometer; stir and heat up to 50°C, add 0.9 parts of persulfuric acid Ammonium; 0.305 parts of thioglycolic acid and 53 parts of water are made into a mixed solution (A), 3.75 parts of acrylic acid and 45 parts of water are made into a mixed solution (B); at the same time, the mixed solutions A and B are added dropwise, and the A solution is dripped for 3.5 hours After the addition, the tem...

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Abstract

The invention relates to the field of water reducers, in particular to a polycarboxylate water reducer and a preparation method thereof. The preparation method mainly comprises the following steps: anunsaturated phosphonic acid monomer and maleic anhydride are subjected to esterification to obtain an esterification product; a molecular weight regulator aqueous solution and an acrylic acid aqueoussolution are added into a mixed initiator, a polyoxyethylene ether macromonomer and the esterification product for reacting at 50-60 DEG C for 1-3 hours. The unsaturated phosphonic acid monomer is esterified with the maleic anhydride, double bonds are introduced into the esterification product, and the esterification product, the polyoxyethylene ether macromonomer and the acrylic acid are polymerized. According to the method, more phosphoric acid groups can be introduced by first introducing the double bonds and then performing polymerization. The problem that polycarboxylate water reducer and concrete material sensitivity caused due to the change of concrete raw materials is overcome, the production method is simple and is convenient to popularize and apply.

Description

technical field [0001] The invention relates to the field of water reducers, in particular to a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has become an important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. However, in practical applications, the performance of water reducers is often affected by mixing factors such as cement components and aggregates, and it is prone to disadvantages such as poor adaptability to some cements and sensitivity. Contents of the invention [0003] The purpose of the present invention is to provide a polycarboxylate water reducer and its preparation method, which aims to improve the existing polycarboxylate water reducer poor adaptability to some cement, easy sensitivity and other problems. [000...

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
CPCC04B24/267C04B2103/302C08F220/06C08F283/065C08F230/02
Inventor 王琴白国强刘军王军岳彩虹李增亮刘洋
Owner 中建西部建设新疆有限公司
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