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

A technology of polycarboxylic acid series and water reducing agent, applied in the field of building materials, can solve the problems of high reaction temperature and large production energy consumption, and achieve the effects of low reaction temperature, energy saving and convenient operation.

Inactive Publication Date: 2015-05-27
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
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation before polymerization:

[0035] 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 methacrylate and 25 parts by weight of water, stir and mix evenly, and prepare dropwise;

[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 dropwise;

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

[0038] (2) Polymerization: Introduce protective gas nitrogen into the polymerization reactor that has been put into mixture C to drive away the air, start sti...

Embodiment 2～ Embodiment 5

[0042] According to the method and steps of Example 1, prepare the polycarboxylate water reducer synthesized at room temperature according to the formula in Table 1, and add the obtained polycarboxylate water reducer according to the 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 parts by weight)

[0044]

[0045]

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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 polycarboxylate water reducer synthesized at room temperature and its preparation method and use method. Background technique [0002] With the development of concrete technology, high-performance polycarboxylate superplasticizer has become one of the indispensable components in the process of concrete use. Since the polycarboxylate superplasticizer was launched in the 1980s, it has the advantages of low dosage, high water reducing rate, good slump retention, various excellent properties for concrete materials, strong molecular design, and environmental protection. It has been favored by people and has become the development hotspot and direction 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 polycarboxylate superplasticizers in my co...

Claims

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Application Information

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Patent Type & Authority Patents(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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