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Preparation method of completely biodegraded thin film

A biodegradable and thin film technology, which is applied in the field of plastic film manufacturing, can solve the problems that plastic films cannot be completely biodegraded, achieve excellent performance and degradation performance, and broaden the range of raw materials

Inactive Publication Date: 2015-04-01
TIANJIN KAIXUAN PLASTIC PROD
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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

Embodiment 1

[0014] A kind of completely biodegradable high amylose-based film of the present embodiment is prepared according to the following steps:

[0015] (1) Adjust the high-amylose starch with water to form starch milk with a mass concentration of 13%, and then use 0.3mol / L sodium hydroxide to adjust the pH value of the starch milk to 8.5, then heat the starch milk to 90°C, and heat the starch milk at 300r / min Gelatinization at stirring speed for 20min;

[0016] (2) Blending an aqueous polyvinyl alcohol solution with a mass concentration of 7% with starch milk at a stirring speed of 100 r / min, wherein the mass ratio of polyvinyl alcohol to high amylose starch is 4:6;

[0017] (3) Add an aqueous glycerin solution with a mass concentration of 15%, and plasticize it for 20 minutes under the condition of 100°C. The quality of glycerol is 20% of the total weight of starch and polyvinyl alcohol. The pH value of the hydrochloric acid regulation system of / L is 2, drips glyoxal and cross-l...

Embodiment 2

[0020] A kind of completely biodegradable high amylose-based film of the present embodiment is prepared according to the following steps:

[0021] (1) Adjust high-amylose starch with water to form starch milk with a mass concentration of 17%, then adjust the pH value of starch milk to 9.5 with 0.5mol / L sodium hydroxide, then heat the starch milk to 110°C, and heat the starch milk at 400r / min Gelatinization at stirring speed for 40min;

[0022] (2) Blending an aqueous polyvinyl alcohol solution with a mass concentration of 9% with starch milk at a stirring speed of 140 r / min, wherein the mass ratio of polyvinyl alcohol to high amylose starch is 5:5;

[0023] (3) Then add a glycerol aqueous solution with a mass concentration of 30%, and plasticize it for 40 minutes under the condition of 105 ° C. The quality of glycerin is 20 % of the total weight of starch and polyvinyl alcohol. The hydrochloric acid of L adjusts the pH value of the system to be 5, and the glyoxal is added dro...

Embodiment 3

[0026] A kind of completely biodegradable high amylose-based film of the present embodiment is prepared according to the following steps:

[0027] (1) Adjust the high amylose starch with water to form starch milk with a mass concentration of 15%, then adjust the pH value of the starch milk to 9.0 with 0.4mol / L sodium hydroxide, then heat the starch milk to 100°C, and heat the starch milk at 350r / min Gelatinization at stirring speed for 30min;

[0028] (2) Blending an aqueous polyvinyl alcohol solution with a mass concentration of 8% with starch milk at a stirring speed of 120 r / min, wherein the mass ratio of polyvinyl alcohol to high amylose starch is 6:4;

[0029] (3) Then add an aqueous glycerin solution with a mass concentration of 22.5%, and plasticize it for 30 minutes at 102.5°C. The pH value of the hydrochloric acid regulation system of / L is 3.5, drips glyoxal cross-linking reaction 40min, and glyoxal quality is 10% of starch and polyvinyl alcohol gross weight, adds 2...

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Abstract

The invention discloses a preparation method of a completely biodegraded thin film. The preparation method comprises the following steps: (1) mixing high amylosestarch with water to obtain starch milk with mass concentration of 13-17%, adjusting the pH value of the starch milk to 8.5-9.5 by 0.3-0.5mol / L sodium hydroxide, heating the starch milk to 90-110DEG C and gelatinizing for 20-40min at a stirring speed of 300-400r / min; (2) blending a polyvinyl alcohol water solution with mass concentration of 7-9% with the starch milk at a stirring speed of 100-140DEG C, wherein the mass ratio of the polyvinyl alcohol to the high amylose starch is 4: 6. The amylose starch content of the used high amylose maize starch is 80-82%; a glyoxal water solution is dripped to ensure that glyoxal is fully reacted to completely join the crosslinking; membrane liquid vacuum degassing is carried out to remove the bubbles caused in the stirring process.

Description

technical field [0001] The invention relates to the field of plastic film manufacture, in particular to a preparation method of a completely 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 apparent. 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 ar...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/24C08L3/12C08L29/04C08K5/053
Inventor 郝永强
Owner TIANJIN KAIXUAN PLASTIC PROD
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