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Preparation method of swelled vermiculite/ polyacrylic acid potassium- acrylamide high water absorption composite material

A technology of potassium polyacrylate and acrylamide is applied in the field of preparation of new materials and super absorbent composite materials, which can solve the problems of low equipment utilization rate and production capacity, easy agglomeration, sticking to walls, difficult post-processing, etc. The effect of network structure and water-absorbing group, reducing production cost, and good development prospect

Inactive Publication Date: 2008-07-23
HUAQIAO UNIVERSITY
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AI Technical Summary

Problems solved by technology

The solution method has the advantages of simple implementation, pure system, uniform cross-linked structure, and no use and recovery of organic solvents; Difficulty and so on
The reversed-phase suspension method has the characteristics of fast reaction and heat dissipation, easy temperature control, high molecular weight of the product, and simple post-treatment; but it is easy to agglomerate and stick to the wall during the reaction, and there are problems such as the use, recycling and pollution of organic solvents
The emulsion polymerization method has the characteristics of fast polymerization rate and high molecular weight of the product, but there are also shortcomings such as the inverse suspension method

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0014] First, the industrially pure acrylic acid monomer and acrylamide monomer are purified, and the polymerization inhibitor is removed by vacuum distillation or adsorption purification.

[0015] Second, the mass ratio of acrylic acid:acrylamide:water is 4:1:4.2. Mix acrylic acid monomer and acrylamide monomer in water to form a monomer mixed solution. Potassium hydroxide solution is added to the monomer mixed solution under stirring condition, and the molar ratio of potassium hydroxide to acrylic acid is 75%, so as to complete the neutralization reaction.

[0016] Thirdly, under strong stirring, add expanded vermiculite powder of 50% by weight of the acrylic acid monomer into the neutralized monomer mixed solution, fully infiltrate and disperse.

[0017] Fourth, add 0.08% of the weight of acrylic acid as cross-linking agent N,N'-methylenebisacrylamide, and 1.2% of the weight of acrylic acid as potassium persulfate as an initiator, and control the reaction temperature at 70...

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Abstract

This invention discloses a method for preparating a kind of inflatable vermiculite / poly-potassium acrylate-acrylamide super water-retention property water -absorbent composite material, which is made by graft copolymerizing acrylic acid, acrylamide and inflatable vermiculite powder. In this invention, inflatable vermiculite powder takes a art of 50%, whose distilled water absorption could amount to 850 times. The absorbency of inflatable vermiculite / poly-potassium acrylate-acrylamide super water -absorbent composite material is a little lower than that of pure organic resin polymer(it can fulfill normal using requirements), while its manufacturing cost is apparently less than that of pure organic resin polymer. Also it has very good water-absorbency and water-retention property, so it has very extensive use in agriculture and forestry, plant planting, soil improvement, food hygiene, buiding, petroleum chemical industry, and so on.

Description

technical field [0001] The invention relates to a preparation method of a superabsorbent composite material, which belongs to the technical field of new material technology and new preparation technology. Background technique [0002] The superabsorbent composite material is a lightly cross-linked water-swellable polymer containing strong hydrophilic groups developed in the 1980s. It can not only absorb hundreds to thousands of times its own weight in distilled water or tens of times Physiological saline, and the adsorbed water is not easy to release under pressure, is a new type of functional material with good development and application prospects. [0003] At present, the preparation methods of superabsorbent composite materials are mainly solution method, inverse suspension method and emulsion polymerization method. The solution method has the advantages of simple implementation, pure system, uniform cross-linked structure, and no use and recovery of organic solvents; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08F265/02C08F2/44C08F4/30C08K5/20C08K3/34
Inventor 林建明唐群委吴季怀黄妙良
Owner HUAQIAO UNIVERSITY
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