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Preparation method of polycarboxylate superplasticizer

A technology of water reducing agent and polycarboxylic acid, applied in the field of preparation of polycarboxylate water reducing agent, can solve the problems of small water reducing rate, large change of slump with time and high dosage, and achieves the improvement of air entrainment function, Improve the slump retention effect and avoid the effect of hardening

Inactive Publication Date: 2018-03-27
广西鸿志新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a preparation method of a polycarboxylate water reducer, which can solve the problems of the existing polycarboxylate water reducer such as high dosage, small water reducing rate, and large change in slump over time

Method used

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  • Preparation method of polycarboxylate superplasticizer

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Effect test

Embodiment 1

[0015] Embodiment 1 - the preparation method of polycarboxylate water reducer

[0016] It includes the following two stages:

[0017] The first stage: under stirring conditions, add 1.5kg acrylic acid, 0.1kg vitamin C, 2kg thiopropionic acid, 20kg methallyl polyoxyethylene ether monomer and 0.5kg ammonium persulfate into the reactor, and heat to 60°C, keep warm for 5 hours; then, add 0.1kg defoamer, 0.1kg air-entraining agent, 0.1kg thickener, 0.1kg preservative to the reactor, and stir evenly;

[0018] The second stage: add 0.1kg retarder and 2.9kg water to the material obtained in the first stage, and stir evenly.

Embodiment 2

[0019] Embodiment 2 - the preparation method of polycarboxylate water reducer

[0020] It includes the following two stages:

[0021] The first stage: under stirring conditions, add 2kg acrylic acid, 0.5kg vitamin C, 4kg thiopropionic acid, 30kg methallyl polyoxyethylene ether monomer and 1kg ammonium persulfate to the reactor, and heat to 130 ℃, heat preservation reaction for 1 hour; then, add 0.05kg defoamer, 0.05kg air-entraining agent, 0.05kg thickener, 0.05kg preservative to the reactor, and stir evenly;

[0022] The second stage: add 0.05kg retarder and 3.7kg water to the material obtained in the first stage, and stir evenly.

Embodiment 3

[0023] Embodiment 3 - the preparation method of polycarboxylate water reducer

[0024] It includes the following two stages:

[0025] The first stage: under stirring conditions, add 1.8kg acrylic acid, 0.4kg vitamin C, 3kg thiopropionic acid, 26kg methallyl polyoxyethylene ether monomer and 0.8kg ammonium persulfate into the reactor, and heat to 80°C, keep warm for 4 hours; then, add 0.06kg defoamer, 0.06kg air-entraining agent, 0.06kg thickener, 0.06kg preservative to the reactor, and stir evenly;

[0026] The second stage: add 0.06kg retarder and 3.2kg water to the material obtained in the first stage, and stir evenly.

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Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer. The method relates to the technical field of concrete admixture preparation, and comprises the following two stages:a first stage: under a stirring condition, adding acrylic acid, vitamin C, mercaptopropionic acid, a methylallyl polyoxyethylene ether monomer and ammonium persulfate into a reactor, heating to 60 DEG C+ / -5 DEG C, and carrying out heat preservation to react for 1 hour to 5 hours; then, adding a defoaming agent, an air entraining agent, a thickening agent and a corrosion remover into the reactor,and uniformly stirring; a second stage: adding a retarder and water into a substance obtained in the first stage, and uniformly stirring. According to the preparation method of the polycarboxylate superplasticizer provided by the invention, the vitamin C used as one of reaction raw materials is added, so that the product polycarboxylate superplasticizer is modified, and a water reducing effect andan anti-collapse effect are improved.

Description

technical field [0001] The invention relates to the technical field of preparation of concrete admixtures, in particular to a preparation method of a polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a high-performance superplasticizer and a cement dispersant in the preparation and construction of cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. [0003] However, most of the polycarboxylate superplasticizers currently on the market have some defects. For example, as the requirements for the durability and strength of concrete buildings in engineering construction and application are getting higher and higher, it is required to develop a low-volume, A high-quality polycarboxylate water-reducer with high water-reducing rate, small change in slump over time, low energy consumption, safety and environmental protection, for this reason, people try to improve the preparation me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/302C08F220/06
Inventor 张晋波
Owner 广西鸿志新材料有限公司
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