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A kind of polylactic acid film and a kind of preparation method of polylactic acid film

A polylactic acid and film technology, applied in the field of polymers, can solve the problems of lack of technical means, strength reduction, slow crystallization speed of polylactic acid film, etc., and achieve the effect of good continuity, simple process, and excellent transverse tensile strength

Active Publication Date: 2021-04-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the slow crystallization speed of polylactic acid film, the strength is reduced. On the basis of controlling the crystallization, there is still a lack of effective technical means to obtain a high-strength, transparent film with excellent degradability.

Method used

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  • A kind of polylactic acid film and a kind of preparation method of polylactic acid film
  • A kind of polylactic acid film and a kind of preparation method of polylactic acid film
  • A kind of polylactic acid film and a kind of preparation method of polylactic acid film

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Experimental program
Comparison scheme
Effect test

Embodiment 8

[0042] After drying the right-handed polylactic acid resin with a melt index of 30g / 10min, and 15% mass fraction of PTT fibers (diameter 0.9μm, aspect ratio 70) were pelletized with a twin-screw extruder, and then extruded by a single screw cast film. In the melt stretching stage, the distance from the die head to the casting roll is 15cm, the temperature of the die head is 175°C, and the cooling air volume is 100m 3 / min, the casting roll temperature is 70°C. During extrusion, in the melt stretching stage, the ratio of the melt extrusion speed to the casting roll line speed is 1:120, and the polylactic acid film can be obtained by winding.

Embodiment 9

[0044] After drying the right-handed polylactic acid resin with a melt index of 30g / 10min, and 15% mass fraction of PTT fibers (diameter 0.9μm, aspect ratio 70) were pelletized with a twin-screw extruder, and then extruded by a single screw cast film. In the melt stretching stage, the distance from the die head to the casting roll is 15cm, the temperature of the die head is 210°C, and the cooling air volume is 100m 3 / min, the casting roll temperature is 70°C. During extrusion, in the melt stretching stage, the ratio of the melt extrusion speed to the casting roll line speed is 1:120, and the polylactic acid film can be obtained by winding.

Embodiment 10

[0046] After drying the right-handed polylactic acid resin with a melt index of 30g / 10min, and 15% mass fraction of PTT fibers (diameter 0.9μm, aspect ratio 70) were pelletized with a twin-screw extruder, and then extruded by a single screw cast film. In the melt stretching stage, the distance from the die head to the casting roll is 15cm, the temperature of the die head is 225°C, and the cooling air volume is 100m 3 / min, the casting roll temperature is 70°C. During extrusion, in the melt stretching stage, the ratio of the melt extrusion speed to the casting roll line speed is 1:120, and the polylactic acid film can be obtained by winding.

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Abstract

The invention discloses a polylactic acid film, which comprises 80-95wt% polylactic acid and 5-20wt% polyester fiber in terms of weight percentage; the polylactic acid is selected from L-polylactic acid or D-polylactic acid resin At least one of these, with a melt index of 10-50 g / 10min, tested under a test condition of 190°C with a load of 2.16Kg; the polyester fiber is selected from polytrimethylene terephthalate fiber or polybutylene terephthalate One of alcohol ester fibers. The polylactic acid film of the invention has a cruciform crystal structure, has excellent longitudinal tensile strength and also has excellent transverse tensile strength. The invention also discloses a preparation method of polylactic acid, which uses polyester fiber as a nucleating agent and adopts melt stretching technology to directly obtain a cross-shaped crystal structure in a unidirectional melt stretching flow field. Higher transverse tensile strength can be produced during transverse stretching, and at the same time, high crystallinity of polylactic acid can be produced by using the melt stretching process.

Description

technical field [0001] The invention relates to the technical field of polymers, in particular to a polylactic acid film and a preparation method of the polylactic acid film. Background technique [0002] With the depletion of petrochemical resources and the generation of a large amount of plastic waste, environmental and resource problems are becoming more and more serious. Biomass sources and aliphatic polyesters that are easily decomposed by microorganisms or active enzymes, such as polylactic acid and other degradable polymers, are widely studied. people's attention. Polylactic acid is a polymer obtained by polymerization of lactic acid as the main raw material. The source of raw material is sufficient and can be regenerated. The production process of polylactic acid is pollution-free, and the product can be biodegraded to realize the cycle in nature. Therefore, it is an ideal green polymer material. . Polylactic acid has good thermal stability and good solvent resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L67/02C08J5/18
CPCC08J5/18C08J2367/04C08J2467/02
Inventor 徐睿杰田子钦黄恒辉谢嘉宜雷彩红
Owner GUANGDONG UNIV OF TECH
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