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Preparation method of polycarboxylic acid high-efficiency water reducer

The technology of high-efficiency water-reducing agent and polycarboxylic acid is applied in the field of water-reducing agent for concrete, which can solve the problems of long reaction period and high temperature, and achieve the effects of short reaction period, shortened reaction period and energy saving.

Active Publication Date: 2012-02-22
南京易发新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a preparation method of polycarboxylate high-efficiency water reducer, which overcomes the defects of high temperature and long reaction cycle in the current preparation method

Method used

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  • Preparation method of polycarboxylic acid high-efficiency water reducer

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Embodiment 1

[0019] The preparation method of polycarboxylic acid high-efficiency water reducer, first mix 600 parts of water, 350 parts of methallyl polyoxyethylene ether and 8 parts of sodium methacryl sulfonate, then heat up to 70 ° C, and then one-time Add 35 parts of acrylic acid, 3 parts of ammonium persulfate, 2 parts of acrylamide and 2 parts of thioglycolic acid, and keep warm for 1 hour to obtain the polycarboxylate superplasticizer.

Embodiment 2

[0021] The preparation method of polycarboxylic acid high-efficiency water reducer, first mix 600 parts of water, 300 parts of methallyl polyoxyethylene ether and 6 parts of sodium methacryl sulfonate, then heat up to 55 ° C, and then Add 30 parts of acrylic acid, 2 parts of ammonium persulfate, 1 part of acrylamide and 1 part of thioglycolic acid, and keep warm for 1 hour to obtain the polycarboxylate superplasticizer.

Embodiment 3

[0023] The preparation method of polycarboxylic acid high-efficiency water reducer, first mix 650 parts of water, 400 parts of methallyl polyoxyethylene ether and 10 parts of sodium methacryl sulfonate, then heat up to 60 ° C, and then one-time Add 40 parts of acrylic acid, 4 parts of ammonium persulfate, 3 parts of acrylamide and 3 parts of thioglycolic acid, and keep it warm for 1 hour to obtain the polycarboxylate superplasticizer.

[0024] The polycarboxylate superplasticizer obtained in the above examples is a colorless and transparent liquid.

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Abstract

The invention belongs to the technical field of water reducers for concrete, and specially, relates to a preparation method of a polycarboxylic acid high-efficiency water reducer. The preparation method comprises the following steps of mixing water, an unsaturated polyether and a monomer containing unsaturated double-bond and polar groups, heating the mixture to a temperature of 50 to 70 DEG C, adding an unsaturated carboxylic acid, an initiator, a polymeric chain growth agent and a terminator by one process, and carrying out heat preservation for 0.5 to 1 hour to obtain the polycarboxylic acid high-efficiency water reducer. The preparation method has the advantages of simple process, short reaction period and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of water reducers for concrete, and in particular relates to a preparation method of polycarboxylic acid high-efficiency water reducers. Background technique [0002] Water reducer is an important concrete admixture and one of the important products in the pillar industry of new building materials. High-efficiency water reducer not only greatly improves the mechanical properties of high-strength concrete, but also provides a simple and easy construction process. Polycarboxylate high-efficiency water-reducer is the third generation of high-performance water-reducer developed after the ordinary water-reducer represented by wood calcium and the high-efficiency water-reducer represented by naphthalene series. A high-efficiency water reducer with the highest content, the best application prospects, and the best comprehensive performance. At present, most of the preparation methods of polycarboxylic acid high-ef...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/38C08F220/06C08F2/38C04B24/16C04B103/30
Inventor 张浩亮李江陈朝华李二宾
Owner 南京易发新材料科技有限公司
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