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Biodegradable pearl cotton and preparation method thereof

A biodegradable and pearl cotton technology, applied in the field of packaging materials, can solve the problems of high production cost, residual foaming agent, complicated process, etc., and achieve the effects of high production efficiency, increased strength and resilience, and wide source of raw materials

Inactive Publication Date: 2019-04-26
泸州天浩新材料研究所(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical properties of the foam material obtained in this way are greatly improved, there are also problems such as complex process, high production cost, and residues of foaming agents such as azodicarbonamide.

Method used

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  • Biodegradable pearl cotton and preparation method thereof
  • Biodegradable pearl cotton and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] After the wheat straw is harvested, it is naturally air-dried and air-dried to reduce the moisture content to below 15%, and then it is preliminarily sorted to ensure that there is no mildew or deterioration, mixed with sand, stones or other sundries; then the straw is further dried with hot air, It is crushed with a rotary knife type plant straw grinder until the particle diameter is less than 70 microns, and dried until the water content is lower than 2%, so as to obtain the straw powder filling material.

[0033] According to the formula ratio in Table 1:

[0034] (1) Weighing the biodegradable polymer main material, straw powder filler and nucleating agent, adding them to the mixer, stirring and mixing evenly to obtain the premix;

[0035] (2) Select a parallel twin-screw extrusion granulator with a screw length-to-diameter ratio of 35:1 to 45:1, and add the premix obtained in step (1) into the hopper of the twin-screw extrusion granulator, Set the barrel temperature...

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Abstract

The invention discloses biodegradable pearl cotton and a preparation method thereof. The preparation method of the pearl cotton comprises the steps of adding wheat straw powder and a nucleating agentto one or a mixture of polypropylene carbonate, toughened polylactic acid, polybutylene succinate and thermoplastic starch as a main material; mixing the mixture uniformly in a high-mixer; then mixingthe mixture through a double-screw mixer and extruding the mixture; air-cooling the extruded mixture, pulling the mixture into strips and pelletizing; further adding a cross-linking agent, an initiator and an anti-shrinking agent to be uniformly mixed; extruding and foaming the mixture through a dual-machine tandem type foaming sheet extrusion system by using supercritical carbon dioxide as a foaming agent to obtain a completely biodegradable environment-friendly pearl cotton sheet with a foaming ratio of 30-70 times. The pearl cotton can be used as a buffering package material or a package filler in place of the existing polyolefin pearl cotton.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, and in particular relates to a completely naturally degradable pearl cotton and a preparation method thereof. Background technique [0002] In the packaging industry, in order to reduce the damage of the packaged products due to external shocks, vibrations, etc., a large number of cushioning packaging materials or packaging fillers are used. Common cushioning packaging materials mainly include foamed plastics, cushioning air cushions, shaving paper, and plant fiber cushioning materials (such as straw, sawdust, loofah, etc.). Among them, foamed plastics are the most used. Foamed plastics refer to a foamy solid material with a porous structure made of synthetic resin after foaming by physical or chemical methods. The density of this plastic material is about 0.01 to 0.50. g / cm 3 , its porous structure can be either closed or open, and its hardness and density can be adjusted within a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L69/00C08L67/02C08L3/02C08L97/02C08K13/06C08K3/26C08K3/36C08K3/34C08K5/5425C08J9/12
CPCC08J9/0042C08J9/0061C08J9/009C08J9/0095C08J9/122C08J2203/06C08J2203/08C08J2367/04C08J2403/02C08J2467/02C08J2469/00C08J2497/02C08K3/346C08K3/36C08K5/5425C08K13/06C08K2003/265C08K2201/011
Inventor 刘德平殷勤俭吴春刘力烨闵成梅
Owner 泸州天浩新材料研究所(普通合伙)
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