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Polycarboxylic acid water reducer, preparation method and application thereof

A technology of water reducer and polycarboxylate, which is applied in the field of polycarboxylate water reducer and its preparation, and can solve the problems of reverse growth of cement paste fluidity, reverse growth of concrete slump, small initial slump, etc.

Pending Publication Date: 2021-07-06
SHANXI SUNWAY INTION TRADE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the influence of factors such as admixtures, cement fineness, grinding process, and gypsum types in cement production, this situation often occurs on construction sites: the fluidity of cement slurry has an anti-growth phenomenon, which makes concrete use. The initial slump is small, but when it arrives at the construction site, the concrete slump will increase instead, and in severe cases, bleeding will occur

Method used

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  • Polycarboxylic acid water reducer, preparation method and application thereof
  • Polycarboxylic acid water reducer, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Prepare dropping solutions A and B: mix 7 parts of acrylic acid and 20 parts of deionized water as dropping solution A; mix 0.12 parts of ascorbic acid reducing agent, 2 parts of mercaptopropionic acid chain transfer agent and 20 parts of deionized water Evenly as the drop solution B, set aside;

[0040] 2) Add 85 parts of methallyl polyoxyethylene ether monomer (molecular weight 4000) and 70 parts of deionized water into the reactor, stir until the methallyl polyoxyethylene ether monomer is completely dissolved, then add 1 After adding 35% hydrogen peroxide, stir for 10 minutes, then dropwise add liquid A and liquid B at a constant speed, the time for adding liquid A is 1.5 hours, the time for adding liquid B is 2 hours, and continue to react for 2 hours after adding liquid B to obtain a reaction liquid;

[0041] 3) A neutralizer solution prepared by adding 2.5 parts of solid sodium hydroxide and 33 parts of deionized water was added, and the pH of the reaction solu...

Embodiment 2

[0043] 1) Prepare dropping solutions A and B: mix 8.5 parts of acrylic acid and 20 parts of deionized water as dropping solution A; mix 0.12 parts of ascorbic acid reducing agent, 2 parts of thioglycolic acid chain transfer agent and 20 parts of deionized water As dripping liquid B, standby;

[0044] 2) Add 85 parts of methallyl polyoxyethylene ether monomer (molecular weight 4000) and 70 parts of deionized water into the reactor, stir until the methallyl polyoxyethylene ether monomer is completely dissolved, then add 1 After adding 35% hydrogen peroxide, stir for 10 minutes, then dropwise add liquid A and liquid B at a constant speed, the time for adding liquid A is 1.5 hours, the time for adding liquid B is 2 hours, and continue to react for 2 hours after adding liquid B to obtain a reaction liquid;

[0045] 3) A neutralizer solution prepared by adding 3 parts of solid sodium hydroxide and 36 parts of deionized water was added, and the pH of the reaction solution was adjuste...

Embodiment 3

[0047] 1) Configure dropping solutions A and B: mix 7 parts of acrylic acid and 20 parts of deionized water as dropping solution A; mix 0.12 parts of sodium formaldehyde sulfoxylate reducing agent, 2 parts of thioglycolic acid chain transfer agent and 20 parts of deionized water Mix the ionic water as the dripping liquid B, and set aside;

[0048] 2) Add 85 parts of methallyl polyoxyethylene ether monomer (molecular weight 4000) and 70 parts of deionized water into the reactor, stir until the methallyl polyoxyethylene ether monomer is completely dissolved, then add 1 After adding 35% hydrogen peroxide, stir for 10 minutes, then dropwise add liquid A and liquid B at a constant speed, the time for adding liquid A is 1.5 hours, the time for adding liquid B is 2 hours, and continue to react for 2 hours after adding liquid B to obtain a reaction liquid;

[0049] 3) A neutralizer solution prepared by adding 2.5 parts of solid sodium hydroxide and 36 parts of deionized water was adde...

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Abstract

The invention discloses a polycarboxylic acid water reducer, which comprises the following raw materials in parts by weight: 70-90 parts of methyl allyl polyoxyethylene ether, 5-12 parts of acrylic acid, 1-2 parts of an initiator, 0.1-0.3 part of a reducing agent, 2-4 parts of a chain transfer agent, 2-5 parts of a pH regulator and 130-150 parts of water. The invention also discloses a preparation method of the polycarboxylic acid water reducer and an application of the polycarboxylic acid water reducer in Portland cement or concrete taking the Portland cement as a cementing material. The polycarboxylic acid water reducer disclosed by the invention has high dispersion and high slump loss performance, and can solve the problems of slump inverse growth and even bleeding of concrete on some construction sites.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a polycarboxylate water reducer and its preparation method and application. Background technique [0002] In recent years, polycarboxylate superplasticizers have been welcomed by producers and users due to their convenient supply of raw materials, simple production process and stable products, and polycarboxylate superplasticizers have also developed rapidly. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have the advantages of low dosage, high water reducing rate, and flexible molecular structure, and have become the most widely used water reducers in the field of engineering construction in my country. [0003] Due to the influence of factors such as admixtures, cement fineness, grinding process, and gypsum types in cement production, this situation often occurs on construction sites: the fluidity of cement slurry...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C04B103/30
CPCC04B24/2647C08F283/065C04B2103/302C08F220/06
Inventor 马雪英边延伟王宏维
Owner SHANXI SUNWAY INTION TRADE CO LTD
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