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A kind of polylactic acid base film and preparation method thereof

A polylactic acid-based, polylactic acid technology, applied in the field of polylactic acid-based film and its preparation, can solve the problems of difficulty in maintaining transparency, low elongation at break, inability to withstand impact and impact, etc. Production application, preparation method is simple and easy to operate, and the effect of good transparency

Active Publication Date: 2020-03-13
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

[0004] However, polylactic acid also has this big defect, its brittleness is remarkable, its toughness is poor, and it is not impact resistant (impact strength is less than 5KJ / m 2 ) and tear, low elongation at break
In view of this problem, at present, the method of blending modification is mostly used to improve it. However, after PLA is modified by blending and toughening, it is usually difficult to maintain transparency, and high toughness and transparency are the key to the preparation of degradable packaging films. The necessary requirements of many products such as beverage bottles and beverage bottles, the existence of the above problems has caused the application of PLA to be greatly limited

Method used

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  • A kind of polylactic acid base film and preparation method thereof
  • A kind of polylactic acid base film and preparation method thereof
  • A kind of polylactic acid base film and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a preparation method for the above-mentioned polylactic acid-based film, comprising the following steps:

[0035] a) mixing polylactic acid, polyadipate / butylene terephthalate, polymethylethylene carbonate-polyurethane copolymer, plasticizer, lubricant, blocking agent and nucleating agent to obtain a raw material mixture;

[0036] b) melting and extruding the raw material mixture through a twin-screw extruder to obtain a resin material;

[0037] c) The resin material is blown into a film by a film blowing machine to obtain a polylactic acid-based film.

[0038] Among them, the type, dosage and source of polylactic acid, polyadipate / butylene terephthalate, polymethylethylene carbonate-polyurethane copolymer, plasticizer, lubricant, blocking agent and nucleating agent, etc. The features are consistent with the above-mentioned technical solutions, and will not be repeated here.

[0039] In the present invention, in the step a), the mix...

Embodiment 1

[0045] Raw material: 35 parts by weight of PLA, 41.5 parts by weight of PBAT, 20 parts by weight of PPCU, 1 part by weight of plasticizer GMS, 0.6 part by weight of plasticizer ATBC, 0.5 part by weight of lubricant EBS, 1 part by weight of blocking agent EA, nucleating agent talc Powder 0.4 parts by weight.

[0046] Preparation: Mechanically blend the above components in proportion for 5 minutes to obtain a raw material mixture; put the obtained raw material mixture into a twin-screw extruder, and the extrusion granulation conditions are as follows: ①The set temperature of the twin-screw extruder is a zone 120~140℃, zone 2 150~170℃, zone 3 160~180℃, zone 4 170~190℃, zone 5 170~190℃, zone 6 170~190℃, zone 7 170~190℃, zone 8 170 ~190°C; ②The head temperature is 170~190°C; ③The screw speed is 100~300rpm. After the raw material mixture is melted and extruded, water cooling, pelletizing and drying are carried out in sequence to obtain the resin material. Use the blown film machin...

Embodiment 2

[0048] Raw material: 35 parts by weight of PLA, 31.5 parts by weight of PBAT, 30 parts by weight of PPCU, 1 part by weight of plasticizer GMS, 0.5 part by weight of plasticizer ATBC, 0.6 part by weight of lubricant EBS, 1 part by weight of blocking agent EA, nucleating agent talc Powder 0.4 parts by weight.

[0049] Preparation: Prepare according to the preparation method of Example 1, and control the thickness of the film to be 0.02-0.04mm.

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Abstract

The invention provides a polylactic acid-based film and a preparation method thereof. The polylactic acid-based film provided by the invention is formed by raw materials comprising the following components: 35 parts by weight of polylactic acid, 10-50 parts by weight of polybutylene adipate / terephthalate, 10-50 parts by weight of polybutylene terephthalate Methylene carbonate-polyurethane copolymer, 0.5-5 parts by weight of plasticizer, 0.1-2 parts by weight of lubricant, 0.1-1 part by weight of blocking agent and 0.1-1 part by weight of nucleating agent. The polylactic acid-based film provided by the invention not only has excellent toughness and tear resistance, but also has good transparency.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a polylactic acid-based film and a preparation method thereof. Background technique [0002] The environmental problems caused by the widespread use of plastic products, especially plastic film products, and the increasingly tense situation of petroleum energy have attracted worldwide attention. Therefore, the development and use of biomass resources and fully biodegradable polymer materials to replace petroleum-based plastics has become a current research hotspot. [0003] Polylactic acid (PLA) is the most widely used biodegradable polymer material. Unlike traditional petroleum-based plastics, PLA is polymerized from lactic acid fermented from plant starch, and is a renewable resource; it has good biodegradability and is eventually decomposed into carbon dioxide and water in the environment, which is harmless to the environment. Pollution; therefore, polylactic acid is of great ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L67/04C08L75/04C08K13/02C08K5/103C08K5/20C08K3/34
Inventor 张会良赵吉丽杨慧丽李欣潘宏伟艾雪董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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