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Polycarboxylate gypsum water reducing agent and preparation method and application thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylate gypsum water reducing agent and its preparation, which can solve the problems of poor strength of hardened body, large water consumption for standard thickening, and long setting time, etc., so as to reduce the setting time , reduce economic costs, and produce simple effects

Pending Publication Date: 2021-02-12
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large specific surface area of ​​gypsum powder, the water consumption of its standard consistency is large, which has a bad influence on the strength of the later hardened body. In addition, the gypsum has a slow setting phenomenon during the setting process, which leads to a long setting time and is not It is beneficial to its application in engineering. In view of this phenomenon, it is of great significance to study gypsum water reducer in depth.

Method used

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  • Polycarboxylate gypsum water reducing agent and preparation method and application thereof
  • Polycarboxylate gypsum water reducing agent and preparation method and application thereof
  • Polycarboxylate gypsum water reducing agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] S1. Add 500 g of early-strength monomer ES9201, 400 g of deionized water, 2 g of hydrogen peroxide, and 11.85 g of sodium methacrylate into a four-neck flask with a capacity of 1 L connected to a stirring device and a thermometer. Ammonium persulfate 2g, configured as a bottom solution;

[0060] S2. Add 9 g of acrylic acid, 6 g of methacrylic acid, 10.35 g of 2-acrylamide-2-methylpropanesulfonic acid, and 32 g of deionized water into conical flask A to obtain liquid A; wherein, the acrylic acid and methacrylic acid Mass ratio 3:2;

[0061] S3. Add 1 g of ascorbic acid and 75 g of deionized water to Erlenmeyer flask B to obtain liquid B;

[0062] S4. Use a peristaltic pump to continuously drop liquid A and liquid B into the bottom liquid of the four-necked flask, and control the dropping time for 180 minutes under constant stirring, and the reaction temperature is 45°C; after the dropping is completed, keep warm for 1 hour and react , add 7.45g sodium hydroxide and 22....

Embodiment 2

[0065] Example 2 is basically the same as Example 1, except that in step S2, 12 g of acrylic acid and 6 g of methacrylic acid are added to the Erlenmeyer flask A, and the mass ratio of acrylic acid to methacrylic acid is 2:1.

[0066] Finally, polycarboxylate gypsum water reducer is obtained. The performance test was carried out on the samples of polycarboxylate gypsum water reducer, and the test results are shown in Table 1.

Embodiment 3

[0068] Example 3 is basically the same as Example 1, except that in step S2, 15 g of acrylic acid and 6 g of methacrylic acid are added to the Erlenmeyer flask A, and the mass ratio of acrylic acid to methacrylic acid is 5:2.

[0069] Finally, polycarboxylate gypsum water reducer is obtained. The performance test was carried out on the samples of polycarboxylate gypsum water reducer, and the test results are shown in Table 1.

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Abstract

The invention discloses a polycarboxylate gypsum water reducing agent and a preparation method and application thereof. The polycarboxylic acid gypsum water reducing agent is prepared from the following raw materials: polyoxyethylene ether, acrylic acid, methacrylic acid, sodium methallyl sulfonate, 2-acrylamide -2-methyl propanesulfonic acid, an initiator, a molecular weight regulator, a pH regulator, deionized water and nanoscale inorganic particles. The polycarboxylic acid gypsum water reducing agent has a certain water reducing rate and can effectively shorten the gypsum setting time.

Description

technical field [0001] The invention relates to the field of building material admixtures, in particular to a polycarboxylate gypsum water reducer and its preparation method and application. Background technique [0002] Gypsum has the advantages of thermal insulation, sound absorption and fire resistance, and has been favored by many construction industry experts. With the rapid development of social and economic construction, the consumption of gypsum products in the global construction field has increased year by year. New gypsum products The variety is becoming more and more abundant. my country is a big country of gypsum, with natural gypsum reserves of more than 60 billion tons, ranking first in the world. Similar to concrete admixtures, adding admixtures to the gypsum system can reduce the water-to-paste ratio and improve the performance of the finished product. Due to the large specific surface area of ​​gypsum powder, the water consumption of its standard consiste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/58C08F2/38C08F2/44C08K3/34C08K3/26C08K3/36C04B24/16C04B103/30
CPCC08F283/065C08F2/38C08F2/44C08K3/34C08K3/26C08K3/36C04B40/0039C08K2003/265C08K2201/011C04B2103/302C08F220/06C08F228/02C08F220/585C04B24/165C04B22/10
Inventor 刘烨王英维王宏维
Owner SHANXI SUNWAY INTION TRADE CO LTD
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