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Micronized modified starch for degrading plastics and preparation method of micronized modified starch

A technology for micronizing starch and degrading plastics, applied in the field of bioplastics, can solve the problems of low addition amount, difficult micronization, poor application effect, etc., and achieve the effect of enhancing dispersibility and compatibility, and easy refining

Pending Publication Date: 2022-03-22
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] According to the above, when starch is applied to fully biodegradable plastics in the prior art, it faces problems such as low addition amount, difficulty in miniaturization, and poor application effect. In order to overcome the above defects, the present invention proposes a biodegradable plastic Micronized modified starch and preparation method thereof

Method used

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  • Micronized modified starch for degrading plastics and preparation method of micronized modified starch
  • Micronized modified starch for degrading plastics and preparation method of micronized modified starch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Add 100-mesh cornstarch into the high-speed mixer, control the temperature of the high-speed mixer to 85°C, close the high-speed mixer, stir at a low speed of 200rpm for 25min, add PEG-6000 with a mass of 6% of the cornstarch, and adjust to Stir at high speed at 600rpm for 20min; then raise the temperature of the high-speed mixer to 100°C, open the exhaust valve, and remove the water until the water content is less than 3%; put the material into the cooling pot, stir and cool to room temperature, and obtain the pretreated starch;

[0037] (2) Mix the pretreated starch and stearic acid evenly according to the mass ratio of 100:1, and add them to the impact jet mill. Crushed and refined, collected to obtain pretreated micronized starch;

[0038] (3) Mix the pretreated micronized starch obtained in step (2) with lactide and stannous octoate according to the mass ratio of 100:3:0.2, and store it in a closed nitrogen-filled reactor at 90°C for 2 days, 110 Put it aside f...

Embodiment 2

[0040] (1) Add 100-mesh tapioca starch into the high-speed mixer, control the temperature of the high-speed mixer to 90°C, close the high-speed mixer, stir at a low speed of 100rpm for 20min, add PEG-6000 with a mass of 8% of the cassava starch, and adjust to Stir at high speed at 600rpm for 15 minutes; then raise the temperature of the high-speed mixer to 100°C, open the exhaust valve, and remove the water until the water content is less than 3%; discharge the material to the cooling pot, stir and cool to room temperature to obtain pretreated starch;

[0041] (2) Mix the pretreated starch and stearic acid evenly according to the mass ratio of 100:1, and add them to the impact jet mill. Crushed and refined, collected to obtain pretreated micronized starch;

[0042] (3) Mix the pretreated micronized starch, lactide, and stannous octoate obtained in step (2) evenly according to the mass ratio of 100:4:0.3, and store them in a closed nitrogen-filled reactor at 90°C for 2 days. P...

Embodiment 3

[0044] (1) Add 100 mesh pea starch into the high-speed mixer, control the temperature of the high-speed mixer to 80°C, close the high-speed mixer, stir at a low speed of 150rpm for 30 minutes, add PEG-6000 with a mass of 5% of the mass of pea starch, and adjust to Stir at high speed at 700rpm for 25 minutes; then raise the temperature of the high-speed mixer to 100°C, open the exhaust valve, and remove the water until the water content is less than 3%; discharge the material to the cooling pot, stir and cool to room temperature to obtain pretreated starch;

[0045] (2) Mix the pretreated starch and dispersant evenly according to the mass ratio of 100:1, and add them to the impact jet mill. The impact speed of the air flow of the impact jet mill is Mach 2.5, and it is collided and crushed under the action of high-speed airflow. Refining, collecting and obtaining pretreated micronized starch;

[0046] (3) Mix the pretreated micronized starch, lactide, and stannous octoate obtain...

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Abstract

The invention relates to the field of bioplastics, and discloses micronized modified starch for degrading plastics and a preparation method thereof.The micronized modified starch is mainly prepared from raw materials including native starch, PEG-6000, a dispersing agent, lactide and stannous octoate, firstly, the native starch and the PEG-6000 are mixed at the temperature of 80-90 DEG C, moisture is discharged at the temperature of 100 DEG C, and pretreated starch is obtained; then, mixing the pretreated starch with a dispersing agent, and crushing and refining in a clash jet mill to obtain pretreated micronized starch; and finally, uniformly mixing the pretreated micronized starch with lactide and stannous octoate, aging for 2 days at 90 DEG C in a closed nitrogen-filled reaction kettle, aging for 1 day at 110 DEG C, cooling to room temperature, and adding into a clash jet mill for crushing and refining to obtain the micronized modified starch for degrading plastics. According to the invention, micronization of starch can be effectively promoted, and the dispersibility and compatibility of micronized modified starch for full-biodegradable plastics are enhanced.

Description

technical field [0001] The invention relates to the field of biological plastics, in particular to a micronized modified starch for degrading plastics and a preparation method thereof. Background technique [0002] Fully biodegradable plastic is a new type of environmentally friendly material. Because it contains active groups that are easily decomposed by microorganisms, such as hydroxyl, ester, and carboxyl, it can be easily decomposed into water under the action of microorganisms in the natural environment. , carbon dioxide and minerals, thus returning to nature. Therefore, fully biodegradable plastics have become one of the effective ways to solve the environmental pollution caused by plastic waste. [0003] With the continuous improvement of environmental protection requirements, fully biodegradable plastics have been vigorously developed and promoted, and have been widely used in various shopping bags, packaging boxes, and disposable cutlery. However, the current cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L67/04C08G63/664C08G63/85
CPCC08L3/02C08G63/664C08G63/85C08L2201/06C08L67/04
Inventor 曾军堂陈庆司文彬李钧霍庆城
Owner CHENDU NEW KELI CHEM SCI CO LTD