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Blend of thermoplastic acetylated starch and polylactic acid and preparation method thereof

An acetylated starch, thermoplastic technology, applied in the field of polymer material modification, can solve the problems of poor mechanical properties, poor compatibility, insufficient toughness, etc.

Active Publication Date: 2014-04-30
优势生物材料科技(湖州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the hydrophilicity of starch, the strong interaction between molecules, and the strong brittleness of polylactic acid, blends of starch and polylactic acid often have poor compatibility and poor mechanical properties, resulting in insufficient toughness. A major obstacle to the application in various fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Acetylated starch: 57kg;

[0039] Polylactic acid: 18kg;

[0040] Glycerin: 10kg;

[0041] Ten polyglycerol pentastearate: 5kg;

[0042] Cellulose acetate: 10kg.

[0043] Production method: Pour 57kg of acetylated starch and 10kg of glycerin into a high-speed mixing mixer, mix at high speed for two minutes, extrude and granulate through a twin-screw extruder to form thermoplastic acetylated starch granules; the details are as follows, first control the extrusion The temperature is 133-135 °C, the screw speed is 320-335 rpm, and the first part of thermoplastic acetylated starch granules is obtained, and then the extrusion temperature is controlled at 100-105 °C, and the screw speed is 370-405 rpm, and the second part of thermoplastic acetylated starch is obtained. starch granules, and then control the extrusion temperature at 105-125°C and the screw speed at 340-345 rpm to obtain the third part of thermoplastic acetylated starch granules, and finally control the extru...

Embodiment 2

[0046] Acetylated starch: 40kg;

[0047] Polylactic acid: 35kg;

[0048] Glycerin: 15kg;

[0049] Ten polyglycerol pentastearate: 3kg;

[0050] Cellulose acetate: 7-kg.

[0051] Production Method:

[0052] a) Pour 50kg of acetylated starch and 15kg of glycerin into a high-speed mixing mixer, mix at high speed for two minutes, extrude and granulate through a twin-screw extruder, and control the extrusion temperature at 100-135°C to form a thermoplastic Acetylated starch granules;

[0053] b) Add 35kg of polylactic acid, 3kg of polyglycerol pentastearate, 7kg of cellulose acetate and the thermoplastic acetylated starch granules obtained in step a) into a high-speed mixer, stir evenly, and extrude through twin-screw Machine extrusion granulation, the extrusion temperature is controlled at 140-180°C to form thermoplastic acetylated starch and polylactic acid blend granules.

Embodiment 3

[0055] Acetylated starch: 50kg;

[0056] Polylactic acid: 22kg;

[0057] Glycerin: 13kg;

[0058] Ten polyglycerol pentastearate: 5kg;

[0059] Cellulose acetate: 10kg.

[0060] The preparation method is the same as in Example 1.

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Abstract

The invention discloses a blend of thermoplastic acetylated starch and polylactic acid and a preparation method thereof. The blend is prepared from the following raw materials in parts by weight: 40-57 parts of acetylated starch, 15-35 parts of polylactic acid, 10-15 parts of glycerin, 3-5 parts of deca-polyglycerol penta-stearate and 7-10 parts of cellulose acetate. According to the blend and preparation method disclosed by the invention, the acetylated starch and polylactic acid are adopted as main ingredients supplemented with an auxiliary glycerol, and the main ingredients and the auxiliary interact and are combined so that the prepared blend has excellent mechanical property.

Description

technical field [0001] The invention relates to the technical field of polymer material modification, in particular to a blend of thermoplastic acetylated starch and polylactic acid with good mechanical properties and a preparation method thereof. Background technique [0002] For a long time, the main treatment methods of plastic waste are landfill, incineration and recycling. However, because plastics are light, bulky, and difficult to decompose, landfilling not only requires a large amount of land resources, but also directly causes environmental pollution; although incineration can recover part of the heat energy, it produces greenhouse gases, and the incineration of some types of plastics also produces toxic gases. Hazardous substances, such as dioxin, etc., cause secondary pollution; recycling and reuse are limited by plastic types and uses, which put forward higher requirements for the entire recycling system. Even in developed countries, such as Italy and Japan, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/06C08L67/04C08L1/12C08K5/053B29B9/06B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/875B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 颜清华
Owner 优势生物材料科技(湖州)有限公司