Polyvinyl alcohol film and preparation method thereof

A technology of polyvinyl alcohol film and polyvinyl alcohol, applied in sustainable manufacturing/processing, bio-packaging, sustainable packaging, etc., can solve problems such as poor compatibility and difficult molding

Pending Publication Date: 2022-06-03
ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the filler of PVA blown film is mostly starch, and its content generally does not exceed 50 parts, because after the starch content exceeds 50 parts, the composite material is difficult to form during the blow molding process due to the poor compatibility of PVA and starch.

Method used

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  • Polyvinyl alcohol film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The polyvinyl alcohol film of this embodiment is made from the following raw materials by weight: 100 parts of polyvinyl alcohol, 60 parts of filler, 30 parts of reinforcing agent, 0.3 parts of bio-based compatibilizer, and 5 parts of plasticizer. The polyvinyl alcohol used in this example has a polymerization degree of 1500 and an alcoholysis degree of 85%; the filler used is starch, the bio-based compatibilizer is LDI, and the strengthening agent is calcium sulfate crystal with a weight ratio of 1:1 whisker and calcium carbonate; the plasticizer used is ethylene glycol and glycerol in a weight ratio of 1:1. The polyvinyl alcohol film of this example was prepared by the method of Example 7.

Embodiment 2

[0032] The polyvinyl alcohol film of this embodiment is made from the following raw materials by weight: 100 parts of polyvinyl alcohol, 120 parts of filler, 30 parts of reinforcing agent, 1 part of bio-based compatibilizer, and 10 parts of plasticizer. The polyvinyl alcohol used in this example has a degree of polymerization of 3500 and an alcoholysis degree of 99%; the filler used is starch, the bio-based compatibilizer is LDI, and the strengthening agent is calcium sulfate crystal with a weight ratio of 1:1 whisker and talc; the plasticizers used are glycerol and isosorbide in a weight ratio of 1:1. The polyvinyl alcohol film of this example was prepared by the method of Example 7.

Embodiment 3

[0034] The polyvinyl alcohol film of this embodiment is made from the following raw materials by weight: 100 parts of polyvinyl alcohol, 100 parts of filler, 20 parts of reinforcing agent, 0.7 part of bio-based compatibilizer, and 8 parts of plasticizer. The polyvinyl alcohol used in this example has a degree of polymerization of 2500 and an alcoholysis degree of 92%; the filler used is starch, the bio-based compatibilizer is LDI, and the reinforcing agent is calcium sulfate crystal with a weight ratio of 1:1 whisker and calcium carbonate; the plasticizers used are isosorbide and sorbitol in a weight ratio of 1:1. The polyvinyl alcohol film of this example was prepared by the method of Example 7.

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Abstract

The invention provides a polyvinyl alcohol film and a preparation method thereof, and belongs to the field of biodegradable materials. The polyvinyl alcohol film is prepared from the following raw materials in parts by weight: 100 parts of polyvinyl alcohol, 60-120 parts of starch, 10-30 parts of a reinforcing agent, 0.1-1 part of lysine diisocyanate and 5-10 parts of a plasticizer, the polymerization degree of the polyvinyl alcohol is 1500 to 3500, and the alcoholysis degree of the polyvinyl alcohol is 85 to 99 percent. According to the invention, lysine diisocyanate is adopted to carry out reaction compatibilization on PVA and starch molecules, so that the compatibility of two phases can be improved; by adopting the plasticizer, the melting temperature of the PVA composite material can be reduced by reducing the intermolecular or intramolecular hydrogen-bond interaction of PVA and starch. Through cooperation of the raw materials, the obtained polyvinyl alcohol film shows excellent strength and toughness in the transverse direction and the longitudinal direction, and has high tensile strength and elongation at break.

Description

technical field [0001] The invention belongs to the field of biodegradable materials, in particular to a polyvinyl alcohol film and a preparation method thereof. Background technique [0002] Non-degradable polymer packaging materials, such as plastic garbage bags and plastic packaging for items, are the main source of packaging material waste. The production of non-degradable polymer packaging materials will consume a large amount of non-renewable petroleum resources, and the waste after use will cause serious pollution to the environment. Landfill disposal of waste not only takes up a lot of land resources, but also takes hundreds of years to degrade, causing long-term damage to the soil; if incineration is used, the harmful gases produced will cause air pollution; if it is recycled, it can only process 25 % waste material, and the technical difficulty is high, the treatment cost is high, and the utilization value of the recycled product is low. The use of non-degradable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/02C08K13/04C08K13/02C08K5/29C08K7/08C08K3/26C08K5/053C08K3/34C08J5/18
CPCC08J5/18C08J2329/04C08J2403/02C08J2429/04C08J2303/02C08K13/04C08K13/02C08K5/29C08K7/08C08K2003/265C08K5/053C08K3/34Y02W90/10
Inventor 何领好刘东亮陈荣源杨皓然马丽周立明方少明
Owner ZHENGZHOU UNIVERSITY OF LIGHT INDUSTRY
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