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Polycarboxylic-acid water reducing agent synthesized at normal temperature, and preparation method and application method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of building materials, can solve the problems of high production energy consumption and high reaction temperature, and achieve the effects of energy saving, low reaction temperature and good fluidity retention

Inactive Publication Date: 2013-06-26
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a normal temperature synthesized polycarboxylate water reducer and its preparation method and use method

Method used

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  • Polycarboxylic-acid water reducing agent synthesized at normal temperature, and preparation method and application method thereof
  • Polycarboxylic-acid water reducing agent synthesized at normal temperature, and preparation method and application method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation before polymerization:

[0035] The preparation of solution A: weigh 9 parts by weight of acrylic acid, 4 parts by weight of methacrylic acid, 2 parts by weight of sodium methacrylic acid sulfonate and 25 parts by weight of water, stir and mix evenly, and prepare for dripping;

[0036] Preparation of solution B: weigh 0.2 parts by weight of L-ascorbic acid, 0.8 parts by weight of thioglycolic acid, 0.2 parts by weight of hydroxyethyl acrylate and 47 parts by weight of water, stir and mix evenly, and prepare for dripping;

[0037] Preparation of mixture C: Weigh 100 parts by weight of unsaturated polyether DD-424, 0.2 parts by weight of hydrogen peroxide (concentration of 30% by weight), 1 part by weight of ammonium persulfate and 80 parts of water, put them into the polymerization reactor, stir evenly, and prepare For polymerization

[0038] (2) Polymerization: pass the protective gas nitrogen into the polymerization reactor into which the mixture C has been put...

Embodiment 2～ Embodiment 5

[0042] According to the method and steps of Example 1, the normal temperature synthesized polycarboxylic acid water reducing agent of the present invention was prepared according to the formula in Table 1, and the obtained polycarboxylic acid water reducing agent was added to the compound according to the addition amount shown in Table 1. In the cement paste and concrete, the performance data of the obtained cement paste and concrete are also shown in Table 1.

[0043] Table 1 (The dosage units of each component are all parts by weight)

[0044]

[0045]

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PUM

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Abstract

The invention discloses a polycarboxylic-acid water reducing agent synthesized at normal temperature, and a preparation method and application method thereof. The polycarboxylic-acid water reducing agent is prepared from the following components in parts by weight:100 parts of unsaturated polyether DD-424, 9-13 parts of acrylic acid, 0-4 parts of methacrylic acid, 0-2 parts of sodium allylsulfonate, 0-2 parts of sodium methylallyl sulfonate, 0.2-1 part of oxydol, 0.2-1 part of ammonium persulfate, 0.2-0.6 part of L-ascorbic acid, 0-0.8 part of thioglycolic acid, 0-0.8 part of mercaptopropionic acid, 0-0.4 part of 2-hydroxyethyl acrylate, 4-6 parts of sodium hydroxide and 182-185 parts of water. At most one of the methacrylic acid, sodium allylsulfonate and sodium methylallyl sulfonate is 0 part; and at most one of the thioglycolic acid, mercaptopropionic acid and 2-hydroxyethyl acrylate is 0 part. The product disclosed by the invention has the advantages of excellent properties, high water reducing rate and favorable slump retention; and the method is simple and convenient to operate, has the advantages of low energy consumption and no discharge of three wastes, and is beneficial to application to large-scale production.

Description

Technical field [0001] The invention relates to the technical field of building materials, in particular to a polycarboxylic acid water-reducing agent synthesized at room temperature, and a preparation method and use method thereof. Background technique [0002] With the development of concrete technology, high-performance polycarboxylic acid water-reducing agents have become one of the indispensable components in the use of concrete. Since its introduction in the 1980s, polycarboxylic acid water-reducing agents have the advantages of low dosage, high water reduction rate, good slump retention, and can give concrete materials various excellent properties, strong molecular design, and environmental protection. It has been favored by people and has become a hot spot and direction for the development of water-reducing agent technology in recent years. In recent years, with the advancement of technical means and the efforts of scientific researchers, the production technology of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/06C08F220/06C08F228/02C08F220/28C04B103/30
Inventor 罗琼董建国王振波李亚杰张天水杜辉
Owner SHANGHAI DONGDA CHEM
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