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Polylactic acid membrane and preparation method of polylactic acid membrane

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: 2018-06-22
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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  • Polylactic acid membrane and preparation method of polylactic acid membrane
  • Polylactic acid membrane and preparation method of polylactic acid membrane

Examples

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 membrane which comprises the following components in percentage by weight: 80-95wt% of polylactic acid and 5-20wt% of a polyester fiber, wherein the polylactic acid is selected from at least one of a levorotatory polylactic acid resin and a dextrorotatory polylactic acid resin; the melting index of the polylactic acid is 10-50g / 10 minutes; the testing condition is that testing is carried out with a load of 2.16Kg at 190 DEG C; the polyester fiber is selected from one of a polyterephthalic acid propylene glycol ester fiber or polyterephthalic acid butanediol ester fiber. The polylactic acid membrane disclosed by the invention is of a cross crystal structure, and has excellent longitudinal tension strength and excellent transverse tension strength aswell. The invention further discloses a preparation method of polylactic acid. The polyester fiber is adopted as a nucleating agent, and the cross crystal structure is directly prepared in a one-waymelt tension fluid field by using a melt tension technique. Relatively high transverse tension strength can be achieved when transverse tension is not carried out, and meanwhile a relatively high crystallization degree can be achieved for the polylactic acid in the melt tension 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 Applications(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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