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Modified starch-based biodegradable plastic and preparation method thereof

A starch-based technology for degrading plastics, applied in botany equipment and methods, plant protection, plant protection covers, etc., can solve the problem of insignificant degradation rate of degradable plastics, achieve fast degradation rate, improve vitality, and optimize the ratio Effect

Inactive Publication Date: 2020-01-31
SHANDONG SI DA KE BIODEGRADABLE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the inventor accelerates the degradation rate by adding a degradation accelerator, the degradation rate of the degradable plastic is not significant

Method used

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  • Modified starch-based biodegradable plastic and preparation method thereof
  • Modified starch-based biodegradable plastic and preparation method thereof

Examples

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Effect test

preparation example 1

[0036] Preparation Example 1 Preparation of octenyl succinic esterified starch

[0037] S1: Dissolve hyaluronic acid with a molecular weight of 8,000-10,000 in water, vortex fully to dissolve, and prepare an aqueous hyaluronic acid solution with a mass concentration of 10% for later use;

[0038] S2: Take 100 parts of cornstarch, add water three times the volume of the starch, gelatinize at 100°C for 20 minutes, cool to room temperature, dry at 40-45°C, grind, pass through a 100-mesh sieve to obtain pregelatinized corn starch;

[0039] S3: Dissolve the pregelatinized starch prepared in step S2 in water to form an aqueous solution with a mass concentration of 30%, adjust the pH value of the solution at room temperature to 8.5-9.0, slowly add 10 parts of octenyl succinic anhydride diluted with ethanol dropwise, and add as you go Stir, react overnight, centrifuge at 2000g, discard the supernatant, wash 5 times with 95% ethanol, dry at 40-45°C, pulverize, and pass through a 100-m...

preparation example 2 10

[0040] Preparation Example 2 Preparation of dodecenyl succinic esterified starch

[0041] The preparation method is the same as Preparation Example 1, the difference is that in step S3, the pH value of the solution is adjusted to 8.5-9.0 at room temperature, and then 10 parts of dodecenyl succinic anhydride diluted with ethanol are slowly added dropwise to prepare dodecenyl succinic anhydride starch.

preparation example 3

[0042] Preparation Example 3 Preparation of Peroxodisulfated Starch

[0043] S1: Dissolve hyaluronic acid with a molecular weight of 8,000-10,000 in water, vortex fully to dissolve, and prepare an aqueous hyaluronic acid solution with a mass concentration of 10% for later use;

[0044] S2: Take 100 parts of potato starch, add water of 3.5 times the volume of starch, gelatinize at 100°C for 20 minutes, cool to room temperature, dry at 40-45°C, grind, pass through a 100-mesh sieve to obtain pregelatinized potatoes starch;

[0045] S3: Dissolve the pregelatinized starch prepared in step S2 in water to form an aqueous solution with a mass concentration of 30%, adjust the pH value of the solution at room temperature to 8.5-9.0, slowly add 6 parts of peroxodisulfuric acid solution with a concentration of 0.1 g / mL dropwise, Stir while adding, react overnight, centrifuge at 2000g, discard the supernatant, wash 5 times with pure water, dry at 40-45°C, pulverize, pass through a 100-mes...

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PUM

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Abstract

The invention discloses a modified starch-based degradable plastic and a preparation method thereof. The degradable plastic comprises the following preparation raw materials in parts by mass: 60-80 parts of polylactic acid, 20-30 parts of polyvinyl alcohol, 40-70 parts of modified starch, 3-15 parts of a cross-linking agent, 0-5 parts of a plasticizer and 0-3 parts of a dispersing agent, wherein the modified starch is alkenyl succinic acid esterified starch and / or peroxy acid esterified starch. According to the preparation method, double bonds are introduced into the polymer to increase the breaking probability of macromolecular chain, and a dioxygen bond is introduced into the polymer to provide a better living environment for aerobic microorganisms, so that the aerobic decomposition rateof the degradable plastic is fundamentally increased.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a modified starch-based biodegradable plastic and a preparation method thereof. Background technique [0002] With the wide application of agricultural mulch film, the output of cotton, tobacco, and crops has increased significantly. However, due to non-degradable plastics remaining in farmland, soil compaction has caused new "white pollution". In addition, the amount of plastic waste in the field of life and shopping has also increased year by year, which has caused the disaster of "plastic waste", caused environmental pollution and affected the ecological balance; for this reason, since the 1970s, people have begun to research and develop degradable plastics. . [0003] Degradable plastics are mainly divided into photodegradable plastics, biodegradable plastics and photo / biological double degradable plastics according to their degradation mechanism. Cur...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L29/04C08L3/06C08L33/02C08L5/08C08K5/12A01G13/02C08B31/04
CPCA01G13/0275C08B31/04C08L67/04C08L2201/06C08L2205/025C08L2205/035C08L29/04C08L3/06C08L33/02C08L5/08C08K5/12
Inventor 袁守汶李高峰
Owner SHANDONG SI DA KE BIODEGRADABLE TECH CO LTD
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