High-performance polycarboxylate based polyether water reducing agent

A technology of polycarboxylate and polyether, which is applied in the fields of polycarboxylate polyether high-performance water reducer, ultra-high-strength concrete, high-performance concrete, and self-compacting concrete. High energy consumption, environmental hazards and other issues, to achieve the effect of wide cement adaptability, improve concrete slump retention, and improve later strength

Inactive Publication Date: 2010-07-21
上海华联建筑外加剂厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional high-efficiency water reducers include naphthalene-based, melamine-based, sulfamate-based, melamine-based, etc., which produce formaldehyde that is harmful to the environment in the production process, and the production energy consumption is high, which does not comply with the national environmental protection policy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Put 75kg of deionized water into the reaction pot, then put 13kg of polyethylene glycol monomethyl ether and 5kg of methacrylic acid into the reaction pot at one time, heat up to 125°C, keep the temperature at half Evenly add 0.6kg of ammonium persulfate dropwise within 1 hour, continue to maintain the temperature and stir for 6 hours to carry out lipidation reaction to generate lipidation liquid, keep warm when the temperature is naturally lowered to 80°C, and start to add 0.4kg of sulfuric acid dropwise, and the uniform dropwise addition is completed within half an hour , Keep the temperature at 80°C and continue to stir for 5 hours of polymerization reaction, then naturally drop to room temperature and add 6kg ion-exchange membrane alkali to adjust the pH value to 6-8 to produce this product.

Embodiment 2

[0022] Example 2: Put 67.3kg of deionized water into the reaction pot, then put 16kg of polyethylene glycol monomethyl ether and 8kg of methacrylic acid into the reaction pot at one time, raise the temperature to 125°C, keep the temperature, and Evenly add 0.9kg of ammonium persulfate dropwise within half an hour, continue to maintain the temperature and stir for 6 hours to carry out lipidation reaction to generate lipidation liquid, keep warm when the temperature is naturally lowered to 80°C, and start to dropwise add 0.8kg of sulfuric acid, and drop evenly within half an hour After completion, keep the temperature at 80°C and continue to stir for 5 hours to carry out the polymerization reaction, then naturally lower to room temperature and add 7kg ion-exchange membrane alkali to adjust the pH value to 6-8 to produce this product.

Embodiment 3

[0023] Example 3: Put 70.2kg of deionized water into the reaction pot, then put 15kg of polyethylene glycol monomethyl ether and 7kg of methacrylic acid into the reaction pot at one time, heat up to 125°C, keep the temperature, and Evenly add 0.7kg of ammonium persulfate dropwise within half an hour, continue to maintain the temperature and stir for 6 hours to carry out lipidation reaction to generate lipidation liquid, keep warm when the temperature is naturally lowered to 80°C, and start to dropwise add 0.6kg of sulfuric acid, and drop evenly within half an hour After completion, keep the temperature at 80°C and continue to stir for 5 hours to carry out the polymerization reaction, then naturally lower to room temperature and add 6.5kg ion-exchange membrane alkali to adjust the pH value to 6-8 to produce this product.

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PUM

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Abstract

The invention relates to a high-performance polycarboxylate based polyether water reducing agent, which is characterized by comprising the following components in percentage by weight: 13 to 16 percent of polyethylene glycol monomethyl ether, 5 to 8 percent of methacrylic acid, 0.6 to 0.9 percent of ammonium persulphate, 0.4 to 0.8 percent of sulfuric acid, 6 to 7 percent of ionic membrane alkali and 65 to 75 percent of deionized water. The polyethylene glycol monomethyl ether and the methacrylic acid are esterified at the temperature of 100 to 130 DEG C in the presence of a specific catalyst, namely the ammonium persulphate and then subjected to oxidation polymerization at the temperature of 80 to 90 DEG C in the presence of a specific oxidant, namely the sulfuric acid, to form a synthetic product of a specific structure. After a synthetic process is completed, the pH value of the synthetic product is adjusted at a normal temperature and the final product is formed. Apart from relatively high stability, the water reducing agent has the characteristics of low admixture, high water reducing rate, wide cement adaptability, high slump retaining capacity, good dispersion effect, high environmental friendliness, and the like when applied to concrete.

Description

technical field [0001] The invention relates to a polycarboxylate polyether high-performance water reducer, which belongs to the field of new material science and is especially suitable for self-compacting concrete, high-performance concrete, super-high-strength concrete and the like. Background technique [0002] Concrete is a basic building material. As one of the concrete components, concrete admixtures, especially concrete superplasticizers, have been widely used. Traditional superplasticizers include naphthalene-based, melamine-based, sulfamate-based, melamine-based, etc., which produce formaldehyde that is harmful to the environment during their production process. The production consumes a lot of energy and does not comply with the national environmental protection policy. At the same time, with the development of special concrete such as self-compacting concrete, high-performance concrete, and ultra-high-strength concrete, high-performance water-reducing agents with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/32C04B24/04C04B22/14C04B103/30
CPCC04B2103/30C04B2103/0009C04B40/0046
Inventor 张鑫樊钧郭执宝王骁敏金漪萍何仙琴周南南顾艳张如勤何全荣
Owner 上海华联建筑外加剂厂有限公司
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