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Biodegradable heat shrinking film

A heat-shrinkable film and biodegradable technology, applied in the field of heat-shrinkable film, can solve the problem of difficult biodegradation of heat-shrinkable film, and achieve the effect of good physical properties and good biodegradability

Inactive Publication Date: 2016-07-20
李杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the attention to the problem of discarding plastic materials, the above-mentioned heat shrinkable film is difficult to biodegrade and has become a problem to be solved

Method used

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  • Biodegradable heat shrinking film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A biodegradable heat-shrinkable film, which is prepared through the following steps:

[0035] In the first step, by weight, 10 parts of dialdehyde starch, 4 parts of polyvinyl alcohol, 3 parts of chitosan and 1 part of sodium carboxymethyl cellulose are added to the reactor, and after reacting under sealed conditions, the improved Reactive dialdehyde starch, reaction time 40min, reaction temperature 80°C;

[0036] In the second step, using a stirring mixer, 150 parts of polylactic acid with a weight average molecular weight of 3 to 300,000, 15 parts of high density polyethylene with a weight average molecular weight of 4 to 500,000, and a weight average molecular weight of 6,000 to 100,000 15 parts of polybutylene adipate, 10 parts of modified dialdehyde starch, 5 parts of polypropylene glycol with a molecular weight of 1000-2000, 1 part of plasticizer ethylene glycol, 1 part of crosslinking agent acetaldehyde, compatibilizer Agent ethylene acrylic acid copolymer 1 par...

Embodiment 2

[0039] A biodegradable heat-shrinkable film, which is prepared through the following steps:

[0040] In the first step, by weight, 20 parts of dialdehyde starch, 7 parts of polyvinyl alcohol, 5 parts of chitosan and 3 parts of sodium carboxymethyl cellulose are added to the reactor, and after reacting under sealed conditions, the improved Reactive dialdehyde starch, reaction time 60min, reaction temperature 90°C;

[0041] In the second step, using a stirring mixer, 200 parts of polylactic acid with a weight average molecular weight of 3 to 300,000, 25 parts of high density polyethylene with a weight average molecular weight of 4 to 500,000, and a weight average molecular weight of 6,000 to 100,000 25 parts of polybutylene adipate, 30 parts of modified dialdehyde starch, 15 parts of polypropylene glycol with a molecular weight of 1000-2000, 4 parts of plasticizer ethylene glycol, 4 parts of crosslinking agent acetaldehyde, compatibilizer Agent ethylene acrylic acid copolymer 4 p...

Embodiment 3

[0044] A biodegradable heat-shrinkable film, which is prepared through the following steps:

[0045] In the first step, by weight, 15 parts of dialdehyde starch, 5 parts of polyvinyl alcohol, 4 parts of chitosan and 2 parts of sodium carboxymethyl cellulose are added to the reactor, and after reacting under sealed conditions, the improved Reactive dialdehyde starch, reaction time 50min, reaction temperature 85°C;

[0046] In the second step, using a stirring mixer, 170 parts by weight of polylactic acid with a weight average molecular weight of 3 to 300,000, 20 parts of high density polyethylene with a weight average molecular weight of 4 to 500,000, and 6,000 to 100,000 weight average molecular weight 20 parts of polybutylene adipate, 20 parts of modified dialdehyde starch, 10 parts of polypropylene glycol with a molecular weight of 1000-2000, 2 parts of plasticizer ethylene glycol, 2 parts of crosslinking agent acetaldehyde, compatibilizer 2 parts of ethylene acrylic acid c...

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Abstract

The invention relates to a biodegradable heat shrinking film, and belongs to the technical field of high polymer materials. The heat shrinking film is prepared through the steps that dialdehyde starch, polyvinyl alcohol, chitosan and sodium carboxymethylcellulose are added into a reaction kettle and subjected to a reaction on the sealed condition to obtain modified dialdehyde starch; a stirring mixer is adopted for stirring polylactic acid, high density polyethylene, polybutylene adipate, the modified dialdehyde starch, polypropylene glycol, a plasticizer, a cross-linking agent, a bulking agent, a surface active agent, a photo-decomposing agent, an inorganic filler, a nucleating agent and a coupling agent to be uniform; the mixed raw materials are placed into a double-screw extruder for extrusion granulation. The heat shrinking film has the good biodegradability and the good physical performance.

Description

technical field [0001] The invention relates to a biodegradable heat-shrinkable film, which belongs to the technical field of polymer materials. Background technique [0002] The heat-shrinkable film (shrinkable film for short) is blow-molded by a rapid cooling and shaping process. This rapid cooling production process is designed according to the principle of high polymer orientation. When the resin is completely plasticized and extruded into an embryo film, the polymerized The material is forced to stretch along the vertical and horizontal directions between the glass transition temperature and the viscous flow temperature, so that the molecular chains of the polymer are oriented along the stretching direction. At this time, the film is rapidly cooled to freeze the strain generated by the stretching orientation. When the film is reheated to the thawing temperature, stress relaxation will occur, that is, the oriented molecular chains will be disoriented. At this time, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L23/06C08L67/02C08L3/10C08L29/04C08L5/08C08L71/02C08K13/02C08K3/26B29C47/92B29C48/92
CPCC08L67/04B29C48/92B29C2948/92704C08J5/18C08J2367/04C08J2423/06C08J2467/02C08L2201/06C08L2203/16C08L2205/025C08L2205/035C08L2207/062C08L23/06C08L67/02C08L3/10C08L29/04C08L5/08C08L71/02C08K13/02C08K2003/265
Inventor 李杰
Owner 李杰
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