Water-soluble biodegradable material, and its preparing method and foamed product

A biodegradable material and water-soluble technology, applied in the field of foaming products, can solve the problems of poor plasticity, difficult foaming and molding, etc., and achieve the effect of good foaming ratio

Inactive Publication Date: 2007-03-28
BEIJING HONGHUA BIOMATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The first object of the present invention is to overcome the shortcomings of existing water-soluble biodegradable materials containing polyvinyl alcohol, which have poor plasticity and are difficult to perform foam molding, and provide a kind of good plasticity that can be prepared by foam molding. Foamed products water soluble biodegradable material

Method used

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  • Water-soluble biodegradable material, and its preparing method and foamed product

Examples

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preparation example Construction

[0026] The preparation method of the biodegradable material provided by the present invention comprises mixing polyvinyl alcohol containing starch, polyhydric alcohol and water to form a mixture, heating and melting the mixture, then extruding and granulating the obtained melt to obtain pellets, and then The pellets are mixed with blowing agent.

[0027] The preparation method of the water-containing polyvinyl alcohol of the present invention comprises fully contacting water and the polyvinyl alcohol under stirring conditions, mixing uniformly, and swelling to obtain the water-containing polyvinyl alcohol. The purpose of fully contacting water and polyvinyl alcohol is to expand the intricately intertwined polyvinyl alcohol molecular chains to the greatest extent through water, thereby achieving the purpose of reducing the melting temperature of polyvinyl alcohol. In order to fully swell the polyvinyl alcohol, the weight ratio of polyvinyl alcohol to water is preferably 0.5-5, ...

Embodiment 1

[0041] This example is used to illustrate the water-soluble biodegradable material provided by the present invention and its preparation method.

[0042] (1) Add water to 1.5 times the weight of polyvinyl alcohol (the degree of alcoholysis is 86, and the average degree of polymerization is 1700) at a stirring speed of 500 rpm, and after stirring for 5 minutes, water-containing polyvinyl alcohol is obtained. Wherein in the obtained water-containing polyvinyl alcohol, the weight ratio of polyvinyl alcohol to water is 2.3. 21 parts by weight of the water-containing polyvinyl alcohol obtained above are mixed with 15 parts by weight of glycerin, 15 parts by weight of sorbitol and 3 parts by weight of methylcellulose, and the mixer is first stirred at a low speed of 100 rpm for about 7 minutes, and then at 200 rpm Stir at a high speed per minute for 8 minutes, stir evenly and place for 4 hours; then add 40 parts by weight of starch, 2 parts by weight of zinc stearate, and 4 parts by...

Embodiment 2

[0046] This example is used to illustrate the water-soluble biodegradable material provided by the present invention and its preparation method.

[0047] (1) Add water to 2.5 times the weight of polyvinyl alcohol (the degree of alcoholysis is 90, and the average degree of polymerization is 2600) at a stirring speed of 400 rpm, and after stirring for 8 minutes, water-containing polyvinyl alcohol is obtained. Wherein in the obtained water-containing polyvinyl alcohol, the weight ratio of polyvinyl alcohol to water is 3.1. 27 parts by weight of the water-containing polyvinyl alcohol obtained above, 50 parts by weight of starch, 20 parts by weight of glycerin, and 3 parts by weight of epoxidized soybean oil are mixed, and the mixer is first stirred at a low speed of 100 rpm for about 7 minutes, and then stirred at a low speed of 200 rpm. Stir at high speed for 8 minutes, and stir evenly to obtain a mixture.

[0048] (2) The mixture obtained above is sent into a twin-screw extrude...

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Abstract

The invention relates to water solubility biodegradable material which contains foaming agent. The material contains the outcome formed by mixture fusing which contains starch, polyhydric alcohol, and aqueous polyvinyl alcohol which has hydrophilicity. Its fusing temperature is 140-190 degree centigrade; decomposition temperature is 250-400 degree centigrade. Thus it can be used to make various foaming series products such as, tray, bowl, cut etc which have better expansion ratio and compressive strength.

Description

technical field [0001] The present invention relates to a water-soluble biodegradable material, its preparation method and foamed products, in particular to a water-soluble fully biodegradable material, its preparation method and foamed products containing the material. Background technique [0002] CN1405230A discloses a water-soluble, non-polluting and fully biodegradable plastic molding material in a short period of time, which contains polyvinyl alcohol, glycerol, diethylene glycol, sorbitol, fiber, white carbon black, Superfine calcium, modified starch. CN1405230A also discloses the preparation method of the material: add 1-30 parts of glycerol to the polyvinyl alcohol raw material, stir at high temperature, make it fully wet, and then add an appropriate amount of auxiliary plasticizer, crosslinking agent, Reinforcing agents, modifiers, fillers, etc.; then, blending and reacting at a temperature of 25-65°C for 5-50 minutes, and then adding the obtained materials into a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04C08K5/23C08J9/06C08J9/18
CPCC08L2201/06C08J2303/02C08L29/04C08J2203/06C08J9/0061C08L3/02C08J2429/00C08J2203/04C08K5/053C08L3/00C08J9/0023C08L2666/04C08L2666/26
Inventor 李小鲁
Owner BEIJING HONGHUA BIOMATERIAL
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