Totally degradable foam buffer packaging material and its manufacturing method

A buffer packaging and biodegradable technology, applied in the field of buffer packaging materials, can solve the problems of easy environmental impact, high market price, and hard biodegradable buffer packaging materials.

Inactive Publication Date: 2004-11-10
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This material has good performance and can be completely biodegradable, but due to the use of high-priced straight-chain and modified starch as raw materials, compared with general-purpose plastics (such as EPS), this material has a higher market price, limit its wide application
[0005] Using low-priced native starch with low amylose content to prepare biodegradable cushioning packaging materials can effectively reduce product costs, but due to the different crystallization properties of amylose and amylopectin, compared with Eco-form series products, Biodegradable cushioning packaging materials prepared from native starch with low amylose content are hard and brittle, and their performance is easily affected by the environment, so they cannot be widely used
Chinese patents CN1361048A; CN1052187C produce shaped cushioning packaging materials by molding method, because continuous industrialized large-scale production cannot be realized, and the above technical problems have not been solved, so it is impossible to produce products with a cost performance comparable to general-purpose plastics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] In terms of weight percentage, get 80 parts of cornstarch (150 mesh), 7.4 parts of ultrafine polyvinyl alcohol (viscosity 0.050Pa. 500mPa.s) placed in a high-speed material mixing machine for pre-mixing for 1 minute, then 7.4 parts of water were slowly and continuously added to the material system, and then the material was mixed for 15 minutes, aged in a sealed bag for 24 hours, and then directly added. The product was prepared in a 44:1 eight-stage heating self-cleaning twin-screw at a rotational speed of 300 rpm.

Embodiment 2

[0015] In terms of weight percentage, take 85.3 parts of cornstarch (200 mesh), 3.1 parts of ultrafine polyvinyl alcohol (viscosity 0.065Pa. 400mPa.s) by the processing method of embodiment 1, make corresponding product after adding 6.2 parts of water.

example 3

[0017] In terms of weight percentage, 86.6 parts of corn starch (300 mesh), 3.2 parts of ultrafine polyvinyl alcohol (viscosity 0.025Pa.s / 20°C), 1.1 parts of silicon dioxide, 1.2 parts of glass fiber, 3.2 parts of oligoamide ( Viscosity 150mPa.s) and 4.7 parts of water, after aging in a sealed bag for 24 hours, directly add to the eight-stage heating self-cleaning twin-screw with a length-to-length ratio of 44:1, and the product is prepared at a speed of 150rpm.

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Abstract

The invention provides a complete biodegradable foam cushioning packing material and method for preparation, characterized in that starch over 80% content is used as base-material, ultra-fine polyvinyl alcohol is used as film forming intensifier, water is used as foaming agent, and core forming agent and flow modifier are added, wherein the mixture is amalgamated through blending homogeneous machine and fed into reverse-flighted screw extrusion machine for one-shot extrusion forming. The product can be used to substitute polystyrene foam for filling with no requirement on shapes.

Description

technical field [0001] The invention relates to a fully biodegradable cushioning packaging material and a manufacturing method thereof. Background technique [0002] In recent years, as people pay more and more attention to resource and environmental issues, renewable resources are used to produce fully biodegradable cushioning packaging products, which can be decomposed into water and carbon dioxide by microorganisms in a natural state after use. Among the researched objects, starch is It has a wide range of sources and low price, so it has become a worldwide research and development hotspot. [0003] At first, people's development focused on thermoplastic / starch blended biodegradable plastics with Griflin, C.J.L. (Adv, Chem, Ser, 134 (1974) 159-170) technology as the core. Biodegradable, while other thermoplastic resins are still not biodegradable, such materials still pose a hazard to the environment. [0004] In 1989, N.Cacourse et al. took the lead in applying for the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/40C08J9/00C08L3/02
Inventor 邓鹏飏冉祥海张坤玉何爱丽董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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