Air-entraining type polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, applied in the field of air-entraining polycarboxylate water-reducing agent and its preparation, can solve the problems of incompatibility of air-entraining agent, low over-solubility, affecting product performance and concrete performance, etc. Achieve important social and economic significance, high air entrainment and strong foam stabilization, avoid compatibility and delamination effects

Active Publication Date: 2020-05-08
广东汇强外加剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional air-entraining method is to add air-entraining agent in the concrete mixing process, or to use ordinary lignosulfonate superplasticizer with air-entraining function, but the effect of these two methods in actual engineering has certain shortcomings
Compounding air-entraining agents in admixtures, especially rosin and saponin air-entraining agents, is prone to incompatibility problems between air-entraining agents and other admixture systems, and admixture stratification occurs, which affects the use efficiency of admixtures
The use of lignosulfonate water reducer, due to its poor water reducing effect, in order to meet the working performance of engineering concrete, use a large amount of lignosulfonate water reducer, and it is easy to cause the transitional retardation of concrete, affecting the performance of concrete. construction progress and project quality
[0004] Air-entraining agents such as compound rosin

Method used

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  • Air-entraining type polycarboxylate superplasticizer and preparation method thereof
  • Air-entraining type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] The components and mass ratios of the air-entraining polycarboxylate water reducer provided in the examples of the present invention are: 40 parts of polyether macromonomer, 10 parts of vinyl small monomer, 2 parts of tea saponin, 0.1 part of catalyst , 2 parts of initiator, and the rest are composed of water.

[0020] S101: Mix 5 parts of vinyl small monomer, 2 parts of tea saponin and 0.1 part of catalyst into a four-necked flask, and react at 100°C for 4 hours to prepare a polymerization-active tea saponin intermediate monomer;

[0021] S102: Mix the tea saponin intermediate monomer, 40 parts of polyether macromonomer and water according to the amount and put them into a four-necked flask, and add 5 parts of vinyl small monomer solution and 2 parts of initiator dropwise at 35°C Solution, trigger monomer polymerization, add dropwise for 2 hours, and keep warm at 35°C for 2 hours to obtain the mother liquor of air-entraining polycarboxylate superplasticizer;

[0022] ...

Embodiment 2

[0024] The components and mass ratios of the air-entraining polycarboxylate water reducer provided in the embodiment of the present invention are: 30 parts of polyether macromonomer, 20 parts of vinyl small monomer, 10 parts of tea saponin, 0.5 part of catalyst , 6 parts of initiator, and the rest are composed of water.

[0025] S101: Mix 10 parts of vinyl small monomer, 10 parts of tea saponin and 0.5 part of catalyst into a four-necked flask, and react at 120°C for 6 hours to prepare a polymerization-active tea saponin intermediate monomer;

[0026] S102: Mix the tea saponin intermediate monomer, 30 polyether macromonomer and water according to the amount and put them into a four-necked flask, and add 10 parts of vinyl small monomer solution and 6 parts of initiator solution dropwise at 60°C , initiate monomer polymerization, add drop time for 3 hours, and keep warm at 35°C for 1.5 hours to obtain the mother liquor of air-entraining polycarboxylate superplasticizer;

[0027...

Embodiment 3

[0029] The components and mass ratios of the air-entraining polycarboxylate water reducer provided in the examples of the present invention are: 20 parts of polyether macromonomer, 15 parts of vinyl small monomer, 5 parts of tea saponin, and 0.3 part of catalyst , 4 parts of initiator, and the rest are composed of water.

[0030] S101: Mix 5 parts of vinyl small monomer, 5 parts of tea saponin and 0.3 part of catalyst into a four-necked flask, and react at 80°C for 8 hours to prepare a polymerization-active tea saponin intermediate monomer;

[0031] S102: Mix the intermediate monomer of tea saponin, 20 parts of polyether macromonomer and water according to the amount and add them into a four-necked flask, and add 10 parts of vinyl small monomer solution and 4 parts of initiator dropwise at a temperature of 45°C Solution, trigger monomer polymerization, add dropwise for 3 hours, keep warm at 35°C for 2 hours, and then get air-entraining polycarboxylate superplasticizer mother l...

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Abstract

The invention discloses an air-entraining type polycarboxylate superplasticizer and a preparation method thereof, and belongs to the technical field of concrete admixtures, wherein the air-entrainingtype polycarboxylate superplasticizer comprises the following raw materials: 20-40 parts of a polyether macromonomer, 5-20 parts of a vinyl micromonomer, 1-10 parts of tea saponin, 0.1-0.5 part of a catalyst, 1-6 parts of an initiator and the balance being water. The excellent foaming and foam stabilizing capabilities of the natural nontoxic product tea saponin are utilized, so that the compatibility problem of the polycarboxylate superplasticizer compound air-entraining agent and the problem of poor stability of the air content in concrete are fundamentally solved. The air-entraining type polycarboxylate superplasticizer product provided by the invention is good in air-entraining performance, high in water reducing rate and high in concrete air content retention rate, and the long-term and durable performance of concrete can be remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to an air-entraining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is an admixture used in cement-based materials, which can significantly improve the working performance, mechanical properties and durability of cement-based materials, and has become an indispensable component in concrete. Some researchers have pointed out that polycarboxylate superplasticizers have a comb structure, and based on the designability of their molecular structure, some functional monomers or structures can be introduced to endow polycarboxylate superplasticizers with more new functions, such as improving polycarboxylate superplasticizers. The slump-preserving performance, air-entraining performance, shrinkage-reducing performance, slow-release performance and so on of the acid superplasticizer. At present, the ...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/32C08F220/06C08F222/06C04B24/26C04B103/30
CPCC08F283/06C04B24/2694C04B2103/302C08F220/32C08F220/06
Inventor 林炎坤
Owner 广东汇强外加剂有限公司
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