Water-soluble biodegradable material, and its preparing method and sheet-like shaped product

A biodegradable material and biodegradable technology are applied in the fields of water-soluble biodegradable materials and their preparation and sheet-like molded products, and can solve the problems of poor flow performance, poor plasticity, and inability to be used for sheet-like molded products, etc. achieve good plasticity

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 purpose of the present invention is to overcome the disadvantages of poor fluidity and plasticity of water-soluble biodegradable materials in the prior art, and cannot be used for sheet shaped products, and provide a kind of water-soluble biodegra

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] The preparation method of the water-containing polyvinyl alcohol of the present invention includes contacting water and polyvinyl alcohol under stirring conditions, mixing uniformly, and swelling to obtain the water-containing polyvinyl alcohol. The purpose of bringing water and polyvinyl alcohol into full contact is to expand the intricately intertwined polyvinyl alcohol molecular chains to the greatest extent through water, so as to achieve the purpose of reducing the melting temperature of polyvinyl alcohol. In order to fully swell the polyvinyl alcohol, the weight ratio of the polyvinyl alcohol to water is 0.5-5, preferably 1-4. When the feed weight ratio of polyvinyl alcohol to water is far less than 0.5, polyvinyl alcohol is dissolved in water to form a solution state instead of the swollen state required by the present invention; when the feed weight ratio of polyvinyl alcohol to water is far greater than 5, Polyvinyl alcohol cannot be fully swollen.

[0029] In orde...

Example Embodiment

[0037] Example 1

[0038] This example is used to illustrate the preparation of the water-soluble biodegradable material of the present invention.

[0039] (1) Add 20 parts by weight of purified water to 40 parts by weight of polyvinyl alcohol with a degree of alcoholysis of 86% and a median degree of polymerization of 1950 under stirring conditions of 500 rpm and stir for 7 minutes to obtain water-containing polyethylene. Alcohol, wherein the weight ratio of polyvinyl alcohol to water is 2.85:1. Then add 5.0 parts by weight of sorbitol, 5.0 parts by weight of glycerin and 5.0 parts by weight of pentaerythritol to 15.0 parts by weight of the water-containing polyvinyl alcohol obtained above, stir and mix uniformly at a speed of 50 revolutions per minute, and place at room temperature. After 24 hours, add 70.0 parts by weight (dry basis weight) of ordinary corn starch with a number average molecular weight of 150,000 to the above mixture and stir evenly. The mixer first mixes at a ...

Example Embodiment

[0041] Example 2

[0042] This example is used to illustrate the preparation of the water-soluble biodegradable material of the present invention.

[0043] (1) Add 35 parts by weight of purified water to 35 parts by weight of polyvinyl alcohol with a degree of alcoholysis of 88% and a median degree of polymerization of 2050 under stirring conditions of 550 rpm and stir for 3 minutes to obtain water-containing polyvinyl alcohol , Wherein the weight ratio of polyvinyl alcohol to water is 1.25:1. Then add 5.0 parts by weight of sorbitol and 5.0 parts by weight of glycerin to 22.0 parts by weight of the aqueous polyvinyl alcohol obtained above, stir and mix uniformly at a speed of 80 revolutions per minute, and then add 60.0 parts by weight (dry basis) ) Common wheat starch with a number average molecular weight of 150,000 was added to the above mixture and stirred uniformly, and then 3.0 parts by weight of carboxymethyl cellulose, 2.0 parts by weight of zinc stearate, 2.0 parts by we...

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PUM

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Abstract

The invention relates to water solubility biodegradable material. The material contains the outcome formed by mixture fusing which contains starch, polyhydric alcohol, and aqueous polyvinyl alcohol which has hydrophilicity. Using the mixture total weight as the criterion, the content of the polyhydric alcohol is between 10wt% and 19wt%. Its fusing temperature is 140-190 degree centigrade; decomposition temperature is 250-400 degree centigrade. Thus it can be used to make sheet material series forming product which has better simply supported beam impact strength, yield strength in tension, water solubility and biodegradability.

Description

technical field [0001] The invention relates to a water-soluble biodegradable material, a preparation method thereof, and a sheet shaped product containing the material. Background technique [0002] CN1405230A discloses a water-soluble, pollution-free plastic molding material that can be completely hydrolyzed and biodegradable in a short period of time. The material contains polyvinyl alcohol, glycerol, diethylene glycol, sorbitol, fiber, Silica, 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 range of 25-65°C for 5-50 minutes, and then adding the obtained materials to a single-screw or twin-screw extruder for granulation, and Film blowing a...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L29/04C08K5/11B29B9/12B29C47/40B29D7/01B29C48/40
CPCC08L2201/06C08L3/02C08L29/04C08K5/053C08L101/16B29B7/46B29C48/40B29B7/007B29B7/86B29B9/06B29B9/12C08L2666/04C08L2666/26
Inventor 李小鲁
Owner BEIJING HONGHUA BIOMATERIAL
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