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Biodegradable high polymer foaming material, foam article and its production method

A foaming material and biodegradation technology, which is used in the manufacture of biodegradable materials or molded products, biodegradable polymer foamable materials, foams and their manufacturing fields, and can solve the problem of undetermined positions for adding foaming agents, etc. question

Inactive Publication Date: 2007-07-11
刘津平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the patent publication does not identify where the blowing agent is added

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] By weight percentage, put 1-96.9% of lactic acid polymer, 0-96.9% of aliphatic-aromatic block copolyester, and 1-10% of nucleating agent such as talcum powder into the mixing device for uniform mixing, or without The mixing device is mixed and directly metered and continuously added to the feed inlet (main feed inlet) of the first zone of the preheated screw extruder, so that the raw materials are moved towards the head of the extruder under the action of the screw rotation, and undergo Mixing, plasticizing and / or melting by heat. When / after the system reaches the melting section of the twin-screw extruder,

[0035]The blowing agent, such as nitrogen, carbon dioxide 0.1-20%, is directly metered separately after mixing or without mixing, and is continuously added to the moving part through the feed port (sub-feed port) arranged in the melting section of the machine. Or the completely melted raw material system 1) and / or on the surface, after the whole raw material syste...

Embodiment approach 2( Embodiment 1

[0037] Put 3.5 kg of polylactic acid with a molecular weight of 170,000, 2 kg of aliphatic-aromatic block copolyester with a molecular weight of 150,000, and 0.1 kg of talcum powder into a high-speed mixer, stir at a speed of 2000 rpm, and mix for 7 minutes , the discharge is continuously input into a feed port of a twin-screw extruder (Germany JP Industrial Technology Equipment Co., Ltd., model JSK26, screw length-to-diameter ratio: 30), and 10% ethanol is passed through a section of the melting section of the machine. The feed inlet (sub-feed inlet) is continuously added to the partly or completely melted raw material system and / or on the surface in motion, so that the entire raw material system is mixed, plasticized, melted and homogenized under the action of screw rotation , leaves the extruder through a head die with 2 circular passages and is cut into cylindrical expandable pellets in air cooling. The temperature of the feeding port (one zone) of the twin-screw extruder ...

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PUM

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Abstract

The invention discloses a making method of biological degraded macromolecular foaming material and foamer, which comprises the following parts: 1) emulsion polymer: aliphatic-aromatic block copolyester, coring agent and raw material system; 2) foaming agent, wherein the raw material is added in the screw squeezer separately and continuously, which is squeezed out of screw-squeezing machine head after blending, plastifying and or fusing.

Description

technical field [0001] The invention belongs to the field of manufacturing and molding biodegradable polymer materials, and relates to a method for manufacturing biodegradable materials or moldings, in particular to biodegradable polymer foamable materials, foams and manufacturing methods thereof. Background technique [0002] At present, the annual output of domestic plastic packaging is more than 2,000 thousand tons, disposable packaging products account for about 30%, the plastic waste produced is about 600 thousand tons, the output of agricultural plastic mulch is about 300 thousand tons, and the disposable plastic medical supplies are about 200 thousand tons , the annual production of plastic waste reaches more than 1,000 thousand tons, which is one of the important sources of "white pollution". [0003] Using degradable polymer materials is one of the effective ways to reduce traditional plastic pollution. Although the currently developed degradable polymer materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L67/03C08J9/00B29C67/24C08K3/36
Inventor 刘津平
Owner 刘津平
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