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Preparation method of high-molecular sodium polyacrylate for water-absorbent resin

A sodium polyacrylate, high molecular weight technology, applied in the field of sodium acrylate preparation, to achieve stable performance, reduce raw material costs, and transparent appearance

Inactive Publication Date: 2016-09-07
诚和环境科技(苏州)有限公司
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  • Summary
  • Abstract
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Problems solved by technology

[0004] The technical problem mainly solved by the present invention is to provide a preparation method of high molecular weight sodium polyacrylate for water-absorbent resin, which can solve the above-mentioned problems existing in the preparation of existing sodium polyacrylate

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of high molecular weight sodium polyacrylate for water-absorbent resin is an inverse emulsion polymerization method, and the specific steps are as follows:

[0021] (1) Preparation of sodium acrylate aqueous solution: Add 1000kg of acrylic acid into a reaction kettle with heating and stirring function, raise the temperature to 40-45°C, and add dropwise to the kettle at a rate of 2-4ml / min under stirring. The mass concentration is 10-15 % sodium hydroxide solution 2000-3000kg, then add 300-500kg of activated carbon, stir and react at constant temperature to form sodium acrylate aqueous solution, after the reaction, filter to remove solid impurities;

[0022] (2) Emulsification: Add 100-300kg of liquid paraffin and 500-800kg of emulsifier PVA dry powder into another reaction kettle, then add the filtrate of sodium acrylate in step (1), stir evenly, and ultrasonically oscillate for more than 30 minutes to make for emulsification;

[0023] (3) Polymeri...

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Abstract

The invention discloses a preparation method of high-molecular sodium polyacrylate for water-absorbent resin. The preparation method includes the steps: (1) preparing sodium acrylate water solution; (2) emulsification; (3) polymerization reaction; (4) purification. The preparation method of the high-molecular sodium polyacrylate for the water-absorbent resin is simple and convenient to operate and easy to implement, the cost of raw materials is reduced is reduced by reversed emulsion polymerization, yield and purity of reactants are improved, and the obtained polyacrylic resin is transparent in appearance, stable in performance, moderate in molecular weight distribution and excellent in water absorptivity.

Description

technical field [0001] The invention relates to the technical field of sodium acrylate preparation, in particular to a preparation method of high molecular weight sodium polyacrylate for water-absorbing resin. Background technique [0002] Sodium polyacrylate with high relative molecular weight is usually used as flocculant and superabsorbent resin. Sodium polyacrylate water-absorbent resin is a new type of functional polymer material widely developed and researched at home and abroad in recent years. It is a kind of strong hydrophilic polymer compound with a loose network structure and low cross-linking degree. Water absorption and water retention properties, non-toxic and odorless, widely used in medical and health, petrochemical, soil water retention and other aspects. [0003] At present, the synthesis process of high-molecular-weight sodium polyacrylate is complicated, and there are problems such as high equipment investment, low product yield, and difficult control of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F2/32
CPCC08F220/06C08F2/32
Inventor 孙云
Owner 诚和环境科技(苏州)有限公司
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