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Moderately crosslinked starch biodegradable plastic and preparation method thereof

A technology of biodegradable plastic and cross-linked starch, applied in the field of moderately cross-linked starch biodegradable plastic and its preparation, can solve the problems of decreased mechanical properties, brittle texture of PLA, long degradation period, etc. Simple to use effects

Pending Publication Date: 2021-11-02
湖北嘉鑫环保新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

PBAT is a thermoplastic biodegradable plastic, which is a copolymer of butylene adipate and butylene terephthalate. It has the characteristics of both PBA and PBT. It has good ductility and elongation at break, and Good heat resistance and impact performance; in addition, it also has excellent biodegradability, but the high price of the material limits its application in the market
Polylactic acid (PLA), also known as polylactide, is a polyester polymer obtained by polymerizing lactic acid as the main raw material. It is a new type of biodegradable material. However, PLA is brittle, has poor toughness, and has a long degradation cycle.
[0005] Although the mechanical properties of starch-based degradable plastics have reached the standards of traditional plastics, starch itself has water absorption, so the material regains moisture and absorbs water, resulting in a serious decline in its mechanical properties, and the higher the starch content, the more serious the problem
Some starch plastics are even completely soluble in water, so their application range is narrow

Method used

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  • Moderately crosslinked starch biodegradable plastic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A moderately crosslinked starch biodegradable plastic, the biodegradable plastic is made of the following raw materials in parts by weight: 20 parts of biodegradable resin, 20 parts of starch, 5 parts of organic fiber powder, 5 parts of inorganic filler powder, and 5 parts of crosslinking agent , 5 parts of plasticizer, 1 part of lubricant, 0.5 part of antioxidant, 0.5 part of coupling agent.

[0028] A method for preparing moderately cross-linked starch biodegradable plastics, comprising the following steps:

[0029] (1) Preparation of cross-linked starch: Weigh 20 parts of starch and appropriate amount of water in parts by weight and add to a high-speed mixer to stir evenly to prepare 40% starch milk, add 5 parts of cross-linking agent, and use 0.1mol / L Adjust the pH of the sodium hydroxide solution to 10. After reacting at a temperature of 45°C for 15 minutes, adjust the pH of the system to 6 with dilute hydrochloric acid with a concentration of 0.1mol / L, adjust the ...

Embodiment 2

[0035] A moderately cross-linked starch biodegradable plastic, the biodegradable plastic is made of the following raw materials in parts by weight: 50 parts of biodegradable resin, 50 parts of starch, 20 parts of organic fiber powder, 20 parts of inorganic filler powder, and 10 parts of crosslinking agent , 10 parts of plasticizer, 3 parts of lubricant, 1 part of antioxidant, 1 part of coupling agent.

[0036] A method for preparing moderately cross-linked starch biodegradable plastics, comprising the following steps:

[0037] (1) Preparation of cross-linked starch: Weigh 50 parts of starch and appropriate amount of water in parts by weight and add it to a high-speed mixer to stir evenly to prepare 40% starch milk, add 10 parts of cross-linking agent, and use a concentration of 0.1mol / L Adjust the pH of the sodium hydroxide solution to 10.5. After reacting at a temperature of 50°C for 25 minutes, adjust the pH of the system to 6.5 with a concentration of 0.1mol / L dilute hydroc...

Embodiment 3

[0043] A moderately cross-linked starch biodegradable plastic, the biodegradable plastic is made of the following raw materials in parts by weight: 80 parts of biodegradable resin, 80 parts of starch, 40 parts of organic fiber powder, 40 parts of inorganic filler powder, and 20 parts of crosslinking agent , 20 parts of plasticizer, 5 parts of lubricant, 2 parts of antioxidant, 2 parts of coupling agent.

[0044] A method for preparing moderately cross-linked starch biodegradable plastics, comprising the following steps:

[0045] (1) Preparation of cross-linked starch: Weigh 80 parts of starch and appropriate amount of water according to parts by weight and add it to a high-speed mixer to stir evenly to prepare 40% starch milk, add 20 parts of cross-linking agent, and use 0.1mol / L Adjust the pH of the sodium hydroxide solution to 11, react at a temperature of 60°C for 40 minutes, adjust the pH of the system to 7 with a concentration of 0.1mol / L dilute hydrochloric acid, adjust ...

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Abstract

The invention discloses a moderately crosslinked starch biodegradable plastic and a preparation method thereof. The biodegradable plastic comprises the following components in parts by weight: 20-80 parts of biodegradable resin, 20-80 parts of starch, 5-40 parts of organic fiber powder, 5-40 parts of inorganic filling powder, 5-20 parts of a crosslinking agent, 5-20 parts of a plasticizer, 1-5 parts of a lubricant, 0.5-2 parts of an antioxidant and 0.5-2 parts of a coupling agent. The biodegradable plastic is mainly prepared by the steps of crosslinked starch preparation, mixing, melt extrusion, cooling granulation and the like. The moderately crosslinked starch biodegradable plastic prepared by the invention is short in degradation period, safe, environment-friendly, good in mechanical property and low in cost.

Description

technical field [0001] The invention relates to the field of biodegradable materials, in particular to a moderately cross-linked starch biodegradable plastic and a preparation method thereof. Background technique [0002] With the acceleration of people's life rhythm, social life is developing towards convenience and sanitation. In order to meet this demand, disposable foam plastic lunch boxes, plastic bags, chopsticks, water cups, etc. began to frequently enter people's daily life. The appearance of these easy-to-use and cheap packaging materials has brought many conveniences to people's lives. But on the other hand, these packaging materials are often discarded after use, causing "white pollution", causing environmental hazards, and becoming a huge environmental problem. [0003] Biodegradable plastics refer to a class of plastics that are degraded by the action of naturally occurring microorganisms such as bacteria, molds (fungi) and algae. The ideal biodegradable plas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/16C08L3/04C08L97/02
CPCC08L101/16C08L3/04C08L2201/06C08L2205/16C08L2205/03C08L97/02
Inventor 张灿杨勇汤传平
Owner 湖北嘉鑫环保新材料科技有限公司
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