Anti-mud polycarboxylate water reducing agent and preparation method thereof

A polycarboxylic acid, anti-mud type technology, applied in the field of building material admixtures, can solve the problems of insufficient slump retention performance, poor adaptability, segregation and bleeding of concrete, achieve good dispersion and dispersion retention, and improve slump retention performance. , the effect of improving dispersing ability and fluidity

Pending Publication Date: 2020-11-06
贵州中兴南友建材有限公司
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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 mud-resistant polycarboxylate superplasticizer and its preparation method, which solves the problem that existing polycarboxylate superplasticizers have poor adaptability and are prone to slump retention performance for concrete with a high mud content Insufficient defects, segregated bleeding and poor workability

Method used

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  • Anti-mud polycarboxylate water reducing agent and preparation method thereof
  • Anti-mud polycarboxylate water reducing agent and preparation method thereof
  • Anti-mud polycarboxylate water reducing agent and preparation method thereof

Examples

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Embodiment 1

[0020] A preparation method of anti-mud type polycarboxylate water reducer, comprising the following steps:

[0021] Add 250g of water and 300g of polyether macromonomer APEG to a 1000mL four-necked round-bottom flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. Then directly add the mixed solution of 3.6g ammonium persulfate and 16g water and stir for 10 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 42g of acrylic acid, 10g of glucose-based unsaturated cationic functional monomers, and 72g of water, and the mixed solution of 0.65g of ascorbic acid, 1.5g of mercaptopropionic acid, and 85g of water. The temperature was maintained at 57 Between -60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 30-35°C, add 30% sodium hydroxide solution and dilution water to obtain an anti-mud type polymer with a pH of 6-...

Embodiment 2

[0024] A preparation method of anti-mud type polycarboxylate water reducer, comprising the following steps:

[0025] Add 250g of water and 300g of polyether macromonomer HPEG into a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. Then directly add the mixed solution of 3.6g ammonium persulfate and 16g water and stir for 10 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 42g of acrylic acid, 10g of glucose-based unsaturated cationic functional monomers, and 72g of water, and the mixed solution of 0.65g of ascorbic acid, 1.5g of mercaptopropionic acid, and 85g of water. The temperature was maintained at 57 Between -60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 35-40°C, add 30% sodium hydroxide solution and dilution water to obtain a mud-resistant polymer with a pH of...

Embodiment 3

[0028] A preparation method of anti-mud type polycarboxylate water reducer, comprising the following steps:

[0029] Add 250g of water and 300g of polyether macromonomer TPEG to a 1000mL four-necked round-bottom flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. Then directly add the mixed solution of 3.6g ammonium persulfate and 16g water and stir for 10 minutes to fully dissolve it. Within 3 hours, add dropwise the mixed aqueous solution consisting of 42g of acrylic acid, 10g of unsaturated cationic functional monomers containing glucose groups, and 72g of water, and the mixed solution of 0.65g of ascorbic acid, 1.5g of mercaptopropionic acid, and 90g of water, and keep the temperature at 57 Between -60°C; continue to react for 2 hours after the dropwise addition is completed, then cool down to 35-40°C, add 30% sodium hydroxide solution and dilution water to obtain a mud-resistant polymer with a pH ...

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Abstract

The invention discloses an anti-mud type polycarboxylate water reducing agent and a preparation method thereof. The polycarboxylate water reducing agent is a copolymer formed by polymerizing unsaturated polyether macromonomers, unsaturated cationic functional monomers containing glucosyl groups and acrylic acid as raw materials in the presence of an initiator and a chain transfer agent through a free radical copolymerization reaction; the unsaturated polyether macromonomer is selected from any one or two of APEG, HPEG or TPEG; the initiator is selected from at least one of hydrogen peroxide, ammonium persulfate or potassium persulfate; the chain transfer agent is selected from at least one of mercaptopropionic acid, mercaptoacetic acid, sodium methallyl sulfonate or sodium allylsulfonate.The molecular side chain of the polycarboxylate water reducing agent designed and synthesized by the method not only contains a glucose group, but also contains a quaternary ammonium salt group; compared with an existing polycarboxylate water reducing agent, the polycarboxylate water reducing agent has higher adsorption capacity, a glucose structure can form a stable solvated water film on the surfaces of cement particles when being dissolved with cement, direct contact between the cement particles is prevented, hydration is hindered, and the slump loss resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of building material admixtures, in particular to a mud-resistant polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has many advantages such as low dosage, high water reducing rate, high slump retention performance, adjustable molecular structure, and environmental friendliness. It has been widely used in bridges, highways, tunnels, high-rise buildings and other projects. In recent years, with the rapid increase in the amount of domestic infrastructure projects, the amount of sand and gravel has increased, and high-quality sand and gravel have become less and less, making more concrete have to use sand and gravel with high mud content. It is found in practical engineering applications that commercially available Polycarboxylate superplasticizer is sensitive to soil in sand and gravel. With the increase of mud content, its dispersibi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F212/14C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F212/26
Inventor 欧阳会幼
Owner 贵州中兴南友建材有限公司
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