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Polyvinyl alcohol/high amylose biodegradable material and melting preparation method thereof

A high-amylose and biodegradable technology, which is applied in the field of melt preparation of polyvinyl alcohol/high-amylose biodegradable composite materials, can solve the problems of difficult to meet the market demand, poor mechanical properties of starch, unsatisfactory mechanical properties, etc., and achieve good Processability and biodegradability, low crystallinity, and obvious plasticizing effect

Inactive Publication Date: 2012-10-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN102140234A discloses a preparation method of a biodegradable composite material based on polylactic acid and polybutylene succinate, but although the biodegradability of polylactic acid is good, its price is high and its mechanical properties are not ideal
CN102140234A discloses a preparation method of compounding modified polylactic acid and polybutylene succinate and adding inorganic fillers such as calcium carbonate, wherein polybutylene succinate is produced by fermentation of biological resources , so the source of raw materials is relatively harsh, and it is difficult to meet the needs of the market
CN102226014A discloses a preparation method of starch and polybutylene succinate biodegradable material, but the mechanical properties of starch are poor and still need to be improved

Method used

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  • Polyvinyl alcohol/high amylose biodegradable material and melting preparation method thereof
  • Polyvinyl alcohol/high amylose biodegradable material and melting preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mix 85 parts of PVA1788 and 15 parts of high amylose starch, 0.3 parts of zinc stearate, 0.3 parts of calcium stearate, and 1.5 parts of modified montmorillonite in a high-speed mixer at 70-100 °C for 20 minutes, Then add 10 parts of dihydroxyacetone, 20 parts of diethanolamine and 0.5 part of liquid paraffin, mix in a high-speed mixer at 70-85°C for 20 minutes, cool to room temperature and extrude and granulate in a twin-screw extruder. The temperature is 130-190°C, and the screw speed is 210 rpm.

[0031] The measured tensile strength of the composite material sample is 23.5MPa, and the elongation at break is 350%. The soil burial method is used for its degradation test, and the period is 4 months, and the weight loss rate of the material is 37%.

Embodiment 2

[0033] Mix 80 parts of PVA1788, 20 parts of high amylose starch, 0.2 parts of zinc stearate, 0.2 parts of calcium stearate, and 1 part of nano silicon dioxide in a high-speed mixer at 70-100 ° C for 20 minutes at high speed, and then add 10 parts of a Diglycerol, 20 parts of diethanolamine, and 0.5 parts of PE wax were mixed in a high-speed mixer at 70-85°C for 15 minutes. The mixture is extruded and granulated in a twin-screw extruder, the barrel temperature is 130-190° C., and the screw speed is 240 rpm.

[0034] The tensile strength of the composite sample was measured to be 21.8MPa, and the elongation was 380%. The degradation experiment was carried out by soil burial method, the period was 4 months, and the weight loss rate of the material was 43%.

Embodiment 3

[0036] Mix 70 parts of PVA1788, 30 parts of high amylose starch, 0.4 parts of zinc stearate, and 2 parts of modified montmorillonite in a high-speed mixer at 70-100°C for 15 minutes, then add 20 parts of dihydroxyacetone, 10 1 part of diethanolamine and 0.3 part of PE wax are mixed in a high-speed mixer at 90-110°C for 15 minutes at high speed, cooled to room temperature and extruded into pellets in a twin-screw extruder with a barrel temperature of 130-190°C and a screw speed of 220 rpm.

[0037] The measured tensile strength of the composite sample was 17.9MPa, and the elongation was 410%. The degradation experiment was carried out by soil burial method, the period was 4 months, and the weight loss rate of the material was 53%.

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Abstract

The invention discloses a polyvinyl alcohol / high amylose biodegradable material and a melting preparation method thereof. The method comprises the following steps: uniformly mixing polyvinyl alcohol, high amylase, heat stabilizer, inorganic filler, low molecular weight plasticizer and processing assistant agent in a high-speed mixer at the temperature of 70 to 120 DEG C; and then, melting, extruding and pelleting the mixture in a double-screw extruder, wherein the temperature of a charging barrel is 130 to 190 DEG C. By the method, a composite system of the low molecular weight plasticizer is rationally selected and a proper amount of processing assistant agent and heat stabilizer are added to successfully implement the thermoplastic molding of the polyvinyl alcohol / high amylose, therefore, not only the melting processing problem of the polyvinyl alcohol / high amylase is solved, but also the processability, mechanical property and biodegradability of the composite material are improved.

Description

1. Technical field [0001] The invention relates to the field of preparation of biodegradable composite materials, in particular to a melting preparation method of polyvinyl alcohol / high amylose biodegradable composite materials. 2. Background technology [0002] With the development of the plastics industry and the development of plastic varieties, more and more plastic products have become indispensable materials in people's life. Traditional plastics are difficult to biodegrade, and a large amount of plastic waste has seriously polluted the environment. In addition, plastics are mostly produced through petroleum routes, and petroleum is a non-renewable resource. Under the current situation of petroleum shortage and high price, the development of plastics will be seriously affected. In this context, it is of great significance to study biodegradable plastics and develop renewable resources. [0003] Polyvinyl alcohol is a biodegradable polymer with high barrier properties...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L3/12C08K13/02C08K5/098C08K3/36C08K3/34C08K5/17C08K5/07C08K5/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 徐卫兵王雷陈俊伟周正发汪瑾任凤梅
Owner HEFEI UNIV OF TECH
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