Water-soluble biodegradable material, and its preparing method and injection moulded product

A biodegradable material and biodegradable technology, applied in the field of water-soluble biodegradable materials and their preparation and injection molding products, can solve the problems of unusable injection molding products and poor 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

[0005] The first purpose of the present invention is to overcome the disadvantages of poor plasticity of water-soluble biodegradable compositions in the prior art and cannot be used to make injection molding products, and to provide a kind of plasticity that can be used to make injection molding products. Water-soluble biodegradable materials for products

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0025] 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

[0034] This example is used to illustrate the preparation of the water-soluble biodegradable material of the present invention.

[0035] (1) 15.0 parts by weight of pure water is added under stirring to 30.0 parts by weight of polyvinyl alcohol with a degree of alcoholysis of 86 and a median degree of polymerization of 1820, and after stirring at a speed of 200 rpm for 6 minutes, water-containing polyvinyl alcohol is obtained. Polyvinyl alcohol having a weight ratio of polyvinyl alcohol to water of 1.8 in the hydrous polyvinyl alcohol. The sorbitol of 2.5 weight parts and the glycerin of 2.5 weight parts are joined in the above-mentioned water-containing polyvinyl alcohol of 15.0 weight parts, adjust stirring speed to be 100 rev / mins to make material stir and mix again and then add 80.0 weight parts (dry basis weight) ) ordinary cornstarch with a number average molecular weight of 150,000 is added to the above mixture and stirred evenly. The mixer is first mixed at a low speed...

Embodiment 2

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

[0039] (1) Add 24.0 parts by weight of pure water to 40.0 parts by weight of polyvinyl alcohol with a degree of alcoholysis of 88 and a median degree of polymerization of 1850 under stirring conditions, and stir at a speed of 250 rpm for 5 minutes to obtain a water-containing The polyvinyl alcohol, wherein the weight ratio of polyvinyl alcohol to water is 2.0. 0.5 parts by weight of sorbitol, 2.0 parts by weight of glycerol, 2.0 parts by weight of pentaerythritol and 0.5 parts by weight of carboxymethylcellulose are added to 27.0 parts by weight of the above-mentioned homogeneous water-containing polyvinyl alcohol, at 100 rpm Stir at a stirring speed and mix evenly. After standing for 12 hours, add 63.0 parts by weight (dry basis weight) of common wheat starch with a number average molecular weight of 150,000 to the above mixture and stir evenly. Th...

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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 0.1wt% and 10wt%. Its fusing temperature is 140-190 degree centigrade; decomposition temperature is 250-400 degree centigrade. Thus it can realize squeezing granulation and injection molding. The formed water solubility biodegradable material 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 an injection molding product containing the material. Background technique [0002] CN 1405230A 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 single-screw or twin-screw extruder for granulation, and can be Film blowing and foam moldi...

Claims

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Application Information

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IPC IPC(8): C08L3/12C08L29/04C08K5/11B29C47/40B29C45/00B29C48/40
CPCC08L3/02C08L29/04C08L1/28C08K5/053C08L3/00B29B7/46B29C48/40B29B7/007B29B7/86C08L2666/02C08L2666/04C08L2666/26C08K13/02C08L2201/06
Inventor 李小鲁
Owner BEIJING HONGHUA BIOMATERIAL
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