Preparation method for completely biodegraded high amylose starches base thin film

A high-amylose and biodegradable technology, which is applied in the field of preparation of completely biodegradable high-amylose-based films, can solve the problems that plastic films cannot be completely biodegraded, achieve excellent performance and degradation performance, and broaden the scope of raw materials.

Inactive Publication Date: 2008-03-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the current plastic film cannot be completely biodegradable, and to provide a method for preparing a completely biodegradable high amylose-based film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0008] Specific embodiment 1: A kind of completely biodegradable high-amylose-based film of this embodiment is prepared according to the following steps: 1. The high-amylose starch is adjusted to a starch milk with a mass concentration of 13% to 17% with water, and then 0.3 to 0.5 mol / L sodium hydroxide to adjust the pH of the starch milk to 8.5-9.5, then heat the starch milk to 90°C-110°C, and gelatinize the starch milk at a stirring speed of 300-400r / min for 20-40min; 7%-9% polyvinyl alcohol aqueous solution, blended with starch milk at a stirring speed of 100-140r / min, wherein the mass ratio of polyvinyl alcohol to high amylose starch is 4:6; ~30% glycerin aqueous solution, plasticizing reaction under the condition of 100~105℃ for 20~40min, the quality of glycerin is 20% of the total weight of starch and polyvinyl alcohol, then lower the temperature to 85℃~90℃, use 0.5~ 1mol / L hydrochloric acid to adjust the pH of the system to 2~5, add dropwise glyoxal for 30~50min for cro...

specific Embodiment approach 2

[0009] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is: in step 1, high amylose starch is adjusted to 14%~16% starch milk with water, and then 0.4mol / L sodium hydroxide is used to adjust the pH of starch milk The value is 9.0. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0010] Specific embodiment three: the difference between this embodiment and specific embodiment one is: in step one, high amylose starch is adjusted into 15% starch milk with water. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention relates to a preparation method of a fully biodegraded high-amylose based film. The invention resolves the problem that the present plastic film cannot be fully biodegraded. The preparation method of the fully biodegraded high-amylose based film includes following steps: (1) Gelatinization; (2) Blending; (3) Plasticization and Crosslinking; (4) Degasification and Drying, and the fully biodegraded high-amylose based film can be obtained by the preparation method. The products produced by the invention are characterized in safety, nontoxicity, full biodegradation, etc., thus having good use performance and degradation performance.

Description

technical field [0001] The invention relates to a method for preparing a fully biodegradable film. Background technique [0002] Since the advent of plastic in the last century, it has penetrated into various fields such as industry, agriculture, national defense and daily life because of its small specific gravity, simple production process, variety of products, aesthetics and practicality. The most used material. While plastic is widely used, its problems are also becoming more and more obvious. On the one hand, due to the stable performance of plastic products, they generally will not disappear by themselves in a short period of time, and because plastic products are difficult to recycle after use, the cost of disposal is high, and waste accumulates quickly, which has become an important cause of environmental pollution and a serious threat to human beings. and the living environment of animals and plants are increasingly becoming a worldwide public hazard. On the othe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L3/12C08J3/24
Inventor 马莺兰俊杰何胜华
Owner HARBIN INST OF TECH
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