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Biologically degradable starch film and its prepn

A fully degradable and biological technology, applied in the field of chemical plastic film substitutes, can solve the problems of huge investment and high production costs, and achieve the effects of uniform distribution of materials, reduced production costs, and reduced production costs

Inactive Publication Date: 2003-11-05
WUHAN JINBAO ENVIRONMENTAL BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can eradicate white pollution, its investment is huge and the production cost is expensive, which makes people sigh.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: a kind of starch biodegradable film, by weight by 5% corn starch polysaccharide hydrolyzate, 0.2% carrageenan hydrolyzate, 0.229% glutaraldehyde, 80.571% polyvinyl alcohol and 14% water portion composition.

Embodiment 2

[0014] Embodiment 2: a kind of starch biodegradable film, by weight by 70% corn starch polysaccharide hydrolyzate, 3% sodium alginate hydrolyzate, 0.245% glyoxal, 18.755% polyvinyl alcohol and 8% Moisture composition.

Embodiment 3

[0015] Embodiment 3: a kind of starch biodegradable film, by weight by 35% wheat starch polysaccharide hydrolyzate, 0.75% xanthan gum hydrolyzate, 0.235% propylene oxide, 54.015% polyvinyl alcohol and 10% Moisture composition.

[0016] The preparation method of the above-mentioned starch biodegradable film comprises the following steps:

[0017] 1) Take cornstarch or wheatstarch, carrageenan, sodium alginate or xanthan gum according to the proportions in the examples, mix them with water evenly, then add an appropriate amount of α-amylase, and carry out hydrolysis at a temperature of 37-90°C . When the viscosity of the hydrolyzate was detected to be 26 Pa·S under the condition of 35° C., the temperature was raised to 100° C. to stop the hydrolysis reaction, and filtered through a 100-mesh sieve to obtain an incompletely hydrolyzed polysaccharide hydrosol solution.

[0018] 2) Mix 18-99 type polyvinyl alcohol with an appropriate amount of water, and dissolve in a water bath a...

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PUM

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Abstract

The biologically degradable starch film consists of starch polysaccharide hydrolyzing product 5-70 wt%, natural gelatin hydrolyzing product 0.2-3 wt%, PVA 18-85 wt%, cross linking agent 0.2-0.3 wt% and water 8-14 wt%, its preparation includes the following steps: mixing starch polysaccharide, natural gelatin, water and proper amount of polysaccharidase to obtain water soluble polysaccharide sol;mixing PVA and water to obtain PVA sol; mixing the polysaccharide sol and the PVA sol and adding proper amount of cross linking agent to form mixed sol; forming film with the mixed sol via dry curtain coating, drying, stretching, and hot setting to form the film with water content of 8-14 wt%. The film has the excellent performance similar to that of chemical plastic film, can be decomposed and absorbed by microbe in soil and has low production cost.

Description

technical field [0001] The invention relates to a substitute for a chemical plastic film, in particular to a starch biodegradable film and a preparation method thereof. Background technique [0002] The birth of chemical plastics was once hailed as a revolution in the 20th century, but its wide application has also formed the recognized white pollution. Studies have shown that chemical plastic waste is difficult to degrade after seventy years in the natural environment, which has caused serious pollution to rivers, lakes and land, and caused great harm to the natural environment. For example, discarded agrochemical plastic films accumulate in the field year after year, which can damage the soil structure of clothing crops, affect the development of crop root systems, and cause a significant reduction in crop yields. After testing the use of chemical plastic mulch in farmland for five consecutive years, the residual mulch plastic waste in each mu of far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L3/02C08L5/00C08L29/04
CPCC08L3/02C08J5/18C08J2303/02C08J2329/04C08L5/00C08L29/04C08L2201/06C08L2205/03
Inventor 涂建刘永平马辉文方墉
Owner WUHAN JINBAO ENVIRONMENTAL BIOTECH
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