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Preparation of biodegradable thermoplastic starch plastic having high starch content

A biodegradable plastic and high-starch technology, applied in the field of biodegradable plastic preparation, can solve the problems of white pollution, high cost of biodegradable resin, and incomplete degradation of materials, etc., and achieve short production process and mechanical Improved performance and processing performance, good processing performance

Inactive Publication Date: 2009-01-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the former, starch is filled in polyolefin in the form of granules, and this material cannot be completely degraded, so it cannot completely solve the problem of "white pollution", so the latter has become the focus of people's research
In my country, starch-based biodegradable plastics widely used in the market are almost all filled starch plastics, and some starch-based fully degradable plastics developed abroad also have low starch content, generally 35-45%, and the cost of biodegradable resins is high. , and there are some defects in use that make the application subject to certain restrictions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Components and dosage (by weight)

[0017] 45 parts wheat starch

[0018] 12 parts of urea

[0019] Polylactic acid 38 parts

[0020] Acrylic acid 1.5 parts

[0021] Dicumyl peroxide 0.1 parts

[0022] Other additives 3.0 parts

[0023] Stir wheat starch, glycerol and other additives in a high-speed mixer at room temperature for 1-10 minutes, put the mixed starch into a PE bag and let it stand naturally for 1-2 days, then extrude the put starch through a twin-screw extruder. The outlet temperature is 60-160°C, and the screw speed is 150-300r / min.

[0024] Stir the thermoplastic starch prepared above, polylactic acid, acrylic acid, dicumyl peroxide, and other additives in a high-speed mixer at room temperature for 1 to 10 minutes, and extrude the mixed materials through a twin-screw extruder to make granules. The outlet temperature is 60-200°C, and the screw speed is 150-300r / min.

[0025] After being extruded and granulated in the second stage, it is dried in an ...

Embodiment 2

[0029] Components and dosage (by weight)

[0030] Tapioca starch 55 parts

[0031] Formamide 14 parts

[0032] Polycaprolactone 27 parts

[0033] 1.5 parts of methyl methacrylate

[0034] Benzoyl peroxide 0.1 parts

[0035] Other additives 2.0 parts

[0036] Operate by the same feeding method and conditions of Example 1 to obtain the corresponding fully biodegradable plastics, and the relevant performance test results are shown in Table 2

[0037] Table 2 The relevant performance test results of materials

[0038] The measured value of example 2 material

Embodiment 3

[0040] Components and dosage (by weight)

[0041] 60 parts cornstarch

[0042] Glycerol 16 parts

[0043] Aliphatic-aromatic copolyester 20 parts

[0044] Maleic anhydride 1.5 parts

[0045] 0.1 parts of 2,5-2,5 di-t-butylperoxyhexane

[0046] Other additives 2.0 parts

[0047] Operate by the same feeding method and conditions of Example 1 to obtain the corresponding fully biodegradable plastics, and the relevant performance test results are shown in Table 3

[0048] Table 3 Relevant performance test results of materials

[0049] The measured value of example 1 material

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Abstract

The invention relates to a production technology of a completely bio-degradable plastic with high starch content. In the technology, natural starch, a plasticizer and other addition agents are blended together, squeezed by a double-screw squeezing machine and manufactured into thermoplastic starch particles. The thermoplastic starch particles are mixed with a blended resin, a compatibilizer, a chemical initiation agent and other addition agents. In the double-screw squeezing machine, the completely bio-degradable plastic with high starch content is manufactured by reactive squeezing. The content of the thermoplastic starch in the prepared completely bio-degradable plastic can achieve 80 percent; the material cost is low; the processing performance is good; the mechanical performance is excellent; in addition, the invention is provided with the completely bio-degradable performance and can be directly used for manufacturing various packaging materials, films, shopping bags and tableware, etc.

Description

technical field [0001] The invention relates to the preparation of a fully biodegradable thermoplastic starch plastic with high starch content, belonging to the technical field of biodegradable plastic preparation. Background technique [0002] The rapid development of the plastic industry has brought great convenience to people's production and life, but the problem of "white pollution" caused by plastic waste is also becoming more and more serious. Environmental protection issues have attracted widespread attention from all over the world. In order to limit the production and use of non-degradable plastics, many countries have promulgated various laws, such as raising tax rates and restricting production. my country also implemented the "plastic limit" on June 1, 2008. "Decree", while restricting the production and use of non-degradable plastics, countries are also vigorously promoting biodegradable plastics as their substitutes. Among biodegradable plastics, starch, a nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08K5/21C08K5/20C08K5/053C08K5/06
Inventor 向明谢新春谭磊蔡燎原蓝方黄蜀华
Owner SICHUAN UNIV
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