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A kind of transparent polylactic acid film and its preparation method and application

A polylactic acid and transparent technology, applied in the field of transparent polylactic acid film and its preparation, can solve the problems of poor toughness of transparent polylactic acid film

Active Publication Date: 2021-07-06
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention provides a transparent polylactic acid film and its preparation method and application, which are used to solve the problem of poor toughness of the existing transparent polylactic acid film

Method used

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  • A kind of transparent polylactic acid film and its preparation method and application
  • A kind of transparent polylactic acid film and its preparation method and application
  • A kind of transparent polylactic acid film and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0051] In this embodiment, put the dried PLA-2003D polylactic acid with a melt index of 7.8g / 10min into the screw extruder when the temperature of the screw extruder reaches the preset temperature, wait for 3-5min, and start the device (air removal knife) ), PLA-2003D polylactic acid is melted, the melt is extruded by the screw extruder, and the air knife is turned on when the melt is stable Polylactic acid film; wherein, the temperature of the extruded film of the screw extruder is 190°C to 210°C, the ratio of the speed of the melt at the extruded film of the screw to the line speed of the casting roll is 1:40, and the air knife is set at the extruded film Between the casting roll and the direction of the tuyere of the air knife and the melt surface, the angle formed is 75°, the distance between the extrusion mouth film and the casting roll is 150mm, and the blowing volume of the air knife is 150m 3 / min, the blast temperature of the air knife is 10°C, and the roll temperatur...

Embodiment 2

[0054] In this embodiment, put the dried PLA-2003D polylactic acid with a melt index of 7.8g / 10min into the screw extruder when the temperature of the screw extruder reaches the preset temperature, wait for 3-5min, and start the device (air removal knife) ), PLA-2003D polylactic acid is melted, the melt is extruded by the screw extruder, and the air knife is turned on when the melt is stable Polylactic acid film; wherein, the temperature of the extruded film of the screw extruder is 190°C to 210°C, the ratio of the speed of the melt at the extruded film of the screw to the line speed of the casting roll is 1:120, and the air knife is set at the film extruded Between the casting roll and the direction of the tuyere of the air knife and the melt surface, the angle formed is 75°, the distance between the extrusion mouth film and the casting roll is 150mm, and the blowing volume of the air knife is 150m 3 / min, the blast temperature of the air knife is 10°C, and the roll temperatu...

Embodiment 3

[0057] In this embodiment, put the dried PLA-4043D polylactic acid with a melt index of 8g / 10min into the screw extruder when the temperature of the screw extruder reaches the preset temperature, wait for 3-5min, and start the device (air removal knife) , PLA-4043D polylactic acid is melted, the melt is extruded by the screw extruder and the air knife is turned on when it is stable, the melt is cooled by the air knife, then stretched by the casting roll, pulled by the traction roll, and the transparent poly Lactic acid film; wherein, the temperature of the extruded film of the screw extruder is 190 ℃ ~ 210 ℃, the ratio of the speed of the melt at the extruded film of the screw to the line speed of the casting roll is 1:40, and the air knife is set between the film at the extruded film and Between the casting rolls, the angle formed between the tuyere direction of the air knife and the surface of the melt is 75°, the distance between the extrusion film and the casting roll is 15...

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Abstract

The invention belongs to the technical field of polymer materials and biomedical materials, and in particular relates to a transparent polylactic acid film and its preparation method and application. The invention provides a method for preparing a transparent polylactic acid film, comprising the following steps: melting polylactic acid in an extruder to obtain a melt, extruding it from the extruder, cooling it with an air knife, and stretching it through a casting roll , drawn by a traction roller, and wound into a film to obtain a transparent polylactic acid film; wherein, the temperature of the film at the extrusion port of the extruder is 150°C to 210°C, and the ratio of the film speed of the melt at the exit port to the line speed of the casting roll is 1 : (30~160), the air knife is arranged between the extrusion mouth film and the casting roll, and the angle formed between the tuyere direction of the air knife and the melt surface is 45°~90°. The preparation method of the present invention can prepare a transparent polylactic acid film without adding any filler additives. The transparent polylactic acid film has oriented fiber crystals and / or an oriented structure as a whole, and has a high degree of crystallinity lower than 8%. Elongation at break and tensile strength.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and biomedical materials, and in particular relates to a transparent polylactic acid film and its preparation method and application. Background technique [0002] Polylactic acid is obtained by polycondensation of lactic acid or ring-opening polymerization of lactide. Its synthetic raw materials come from crops, such as corn stalks, potatoes, potatoes, etc., and are degradable under natural conditions. Compared with traditional plastics, its synthetic raw materials are renewable resources. It is abundant in reserves and cheap, and is an environmentally friendly material. With good biocompatibility, polylactic acid (L-rotary) can be absorbed by the human body, and can be applied to medical materials, such as bone nails, sutures, etc. Although polylactic acid has considerable application prospects, its poor toughness (elongation at break is only 6%) severely limits the application range ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/02B29K67/00B29L7/00
CPCB29K2067/046B29L2007/00
Inventor 田子钦雷彩红徐睿杰
Owner GUANGDONG UNIV OF TECH
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