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High-performance polylactic acid blow molding thin film and preparation method thereof

A technology of blown film and polylactic acid, which is applied in the field of high-performance polylactic acid blown film and its preparation, can solve the problems of poor performance of blown film, achieve transparency, maintain complete biodegradation, and reduce energy consumption Effect

Active Publication Date: 2019-02-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem of poor blown film-forming performance of polylactic acid (pure polylactic acid, without additives) in the prior art, to provide a high-performance polylactic acid blown film and its preparation method

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  • High-performance polylactic acid blow molding thin film and preparation method thereof
  • High-performance polylactic acid blow molding thin film and preparation method thereof

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preparation example Construction

[0021] The preparation method of high-performance polylactic acid blown film of the present invention comprises the following steps:

[0022] Step 1. Dry the polylactic acid with crystallization ability and directly perform cold crystallization treatment (the method is annealing), or first dry the polylactic acid with crystallization ability, extrude granulation, dry, and then perform cold crystallization treatment (the method is annealing ), obtain crystallized polylactic acid material;

[0023] Step 2: blowing the crystallized polylactic acid obtained in step 1 into a film at 150-160° C. to obtain a high-performance polylactic acid blown film.

[0024] In the above technical solution, in step 1, the cold crystallization temperature of polylactic acid with crystallization ability is 90-120°C.

[0025] In the above technical solution, in step 1, a twin-screw extruder is used for extrusion and granulation, and the setting conditions of the twin-screw extruder are: Zone 1: 165-...

Embodiment 1

[0030] PLA (trade name: Natureworks 2002D, D-type lactic acid unit content: 4%, weight average molecular weight: 121,000 g / mol) was placed in a vacuum oven at 70° C. for 24 hours under vacuum. Then it was annealed at 110°C for 5 hours to make the cold crystallization complete, and the crystallized polylactic acid was obtained, and the crystallized polylactic acid was blown into a film by a film blowing machine. Zone: 155°C, Zone 3: 155°C, Zone 4: 155°C, the screw speed of the main engine is 200rpm, the traction ratio is 8.6, and the inflation ratio is 2.7. The mechanical properties of the films were tested, and the test results are listed in Table 1.

Embodiment 2

[0032] PLA (trade name: Natureworks 2003D, D-type lactic acid unit content 4.1%, weight average molecular weight 180000 g / mol) was placed in a vacuum oven at 70° C. for 24 hours under vacuum. Add PLA to the twin-screw extruder, and the extrusion and granulation conditions are as follows: the set temperature of the twin-screw extruder is: Zone 1: 177°C, Zone 2: 183°C, Zone 3: 184°C, Zone 4: 185°C, zone 5: 185°C, zone 6: 185°C, zone 7: 184°C, zone 8: 183°C, head: 181°C, screw speed 200rpm, polylactic acid pellets were obtained after extrusion granulation and drying , the pellets were annealed at 105°C for 5 hours to make the cold crystallization complete, and the crystallized polylactic acid was obtained, and the crystallized polylactic acid was blown into a film by a blown film machine. The setting conditions of the blown film machine were: Zone 1: 155°C , Zone 2: 155°C, Zone 3: 155°C, Zone 4: 155°C, the screw speed of the main engine is 200rpm, the traction ratio is 8.6, and t...

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Abstract

The invention relates to a high-performance polylactic acid blow molding thin film and a preparation method thereof, belongs to the technical field of biodegradable polymeric materials, and solves thetechnical problem of poor pure polylactic acid blow molding film-forming performance in the prior art. According to the high-performance polylactic acid blow molding thin film, polylactic acid with crystallization capacity serves as a raw material and is crystallized and blow-molded to form the thin film. The thin film can simultaneously have high strength, modulus, tensile breaking elongation and tearing strength in a horizontal direction and a vertical direction. The thin film overcomes the shortcoming of severe brittleness of the polylactic acid thin film and retains transparency and completely biodegradable environmental protection performance of the polylactic acid, so that a polylactic acid thin film product is widely used. Experimental tests show that the horizontal breaking elongation and the vertical breaking elongation of the thin film are 73% and 135%, and the horizontal tearing strength and the vertical tearing strength of the thin film reach up to 223KN / m and 183KN / m.

Description

technical field [0001] The invention relates to a high-performance polylactic acid blown film and a preparation method thereof, belonging to the field of biodegradable polymer materials. Background technique [0002] With the increasing requirements for environmental protection, the demand for biodegradable materials in my country and the world has shown an explosive growth trend. Especially due to the rapid development of the packaging industry, the demand for packaging bags such as express bags, kitchen garbage bags, and supermarket shopping bags is increasing day by day. The use of non-biodegradable packaging materials has brought serious environmental pollution problems. Therefore, the development of fully biodegradable materials and their film bag products has very broad application prospects. [0003] Polylactic acid (PLA) is recognized as the most promising green and environmentally friendly plastic in the 21st century. It is derived from renewable plant resources an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08J5/18B29C48/92B29L7/00
CPCB29L2007/00C08J5/18C08J2367/04
Inventor 韩立晶曹增文陈云静董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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