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

A biodegradable material and water-soluble technology, applied in the field of film products, can solve the problems of not being able to achieve a molten state, not being able to improve the plasticity of polyvinyl alcohol, and film blowing.

Inactive Publication Date: 2007-03-28
李小鲁
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if a plasticizer is added, the plasticizer still cannot enter the polyvinyl alcohol to modify it, nor can it improve the plasticity of the polyvinyl alcohol very well, but can only be absorbed by starch, so the above mixture is water-containing The mixture of starch, polyvinyl alcohol, plasticizer and additives and other components still cannot achieve a molten state, and can only be made into film products by conventional casting methods, and cannot be blown into film by other methods that need to go through a molten state.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0026] 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, preferably 1-4. When the feed weight ratio of polyvinyl alcohol and water was far less than 0.5, polyvinyl alcohol was dissolved in water to form a solution state rather than the swelling state required by the present invention; when the feed weight ratio of polyvinyl alcohol and water was far greater than 5, All polyvinyl alcohol cannot be fully s...

Embodiment 1

[0036] This example is used to illustrate the water-soluble biodegradable material provided by the present invention and its preparation method.

[0037] (1) Add water to 1.5 times the weight of polyvinyl alcohol (the degree of alcoholysis is 86, the median 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 in a blender, and the blender is stirred at a low speed of 100 rpm for about 7 minutes, and then Stir at a high speed of 200 rpm for 8 minutes, stir evenly and let stand for 4 hours; then add 40 parts by weight of starch, 2 parts by weight of zinc stearate, and 4 parts by ...

Embodiment 2

[0040] This example is used to illustrate the water-soluble biodegradable material provided by the present invention and its preparation method.

[0041] (1) Add water to 2.5 times the weight of polyvinyl alcohol (the degree of alcoholysis is 90, the median 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 epoxy soybean oil are mixed in a mixer, and the mixer is first stirred at a low speed of 100 rpm for about 7 minutes, and then Stir at a high speed of 200 rpm for 8 minutes, and stir evenly to obtain a mixture M2. The composition of the obtained mixture M2 is shown in Table 1.

[0042] (2) The above-m...

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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 19-40wt%. Its fusing temperature is 140-190 degree centigrade; decomposition temperature is 250-400 degree centigrade. Thus it can be made into film products by blow molding forming which is biodegradable, has high tensile break strength reached to 65 megapascal, 398% percentage elongation at rupture at the condition of high starch content.

Description

technical field [0001] The invention relates to a biodegradable material, a preparation method thereof, and a film product containing the material, more particularly to a water-soluble biodegradable material, a preparation method thereof, and a film product 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 mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L29/04B29B9/12B29C47/40B29D7/01
CPCC08L3/02C08L29/04C08L1/28C08K5/053B29B9/12B29B9/06B29B7/48B29B7/86B29B7/726B29B7/88B29B7/82C08L2666/02C08L2666/04C08L2666/26C08K13/02
Inventor 李小鲁
Owner 李小鲁
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