PGA-enhanced degradable film and preparation method thereof

A technology for degrading films and polyesters, applied in the field of polymer materials, can solve the problems of restricting large-scale industrial applications, slow crystallization and hydrolysis speed, etc., achieve good water vapor barrier performance, improve compatibility, and strong hydrophilicity and the effect of polarity

Active Publication Date: 2021-09-14
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, several inherent disadvantages of PLA, such as brittleness, slow crystallization, and slow hydrolysis, limit its large-scale industrial application.

Method used

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  • PGA-enhanced degradable film and preparation method thereof

Examples

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preparation example Construction

[0026] The preparation method of the degradable film reinforced by PGA according to the present invention comprises the following steps: (1) degradable polyester, polyglycolic acid, bio-based filler are dried at 60-80°C for 2-4h; Mix at 60-80°C for 2-4 hours; (3) Put the degradable polyester, the polyglycolic acid, the bio-based filler, the chain extender, and the plasticizer into a high-speed mixer according to the proportion and mix them evenly , wherein the mixing speed is 2000-3000rpm, and the mixing temperature is 70-90°C; (4) Put the above-mentioned compound into a twin-screw extruder to extrude and use a granulator to granulate, wherein the temperature is below 200-230°C Extrude at a speed of 100-200rpm, and pass through a pelletizer to obtain a composite material masterbatch; (5) Use a blow molding machine to blow mold the obtained composite material masterbatch.

[0027]In one embodiment of the preparation method of the PGA-enhanced degradable film according to the pr...

Embodiment 1

[0030] This example provides a method for preparing a PGA-enhanced degradable film: (1) Dry polylactic acid, polyglycolic acid, and starch at 80°C for 4 hours; (2) Mix citric acid and glycerin at a ratio of 1:1 After uniformity, heat at a constant temperature of 80°C for 3 hours; (3) According to the proportioning ratio, 100 parts of polylactic acid, 10 parts of polyglycolic acid (PGA), 25 parts of starch, 0.5 parts of chain extender 2-imidazolidinone, and 10 parts of plasticizer citric acid and glycerin Put one part into a high-speed mixer and mix evenly, wherein the mixing speed is 2500rpm, and the mixing temperature is 80°C; (4) Put the above-mentioned mixture into a twin-screw extruder to extrude and use a granulator to granulate, wherein the temperature is 220 Extrude at a speed of 150rpm at ℃, and pass through a pelletizer to obtain a composite material masterbatch. (5) Blow molding the obtained composite material masterbatch by using a blow molding machine.

Embodiment 2

[0032] This example provides a method for preparing a PGA-enhanced degradable film: (1) Dry polylactic acid, polyglycolic acid, and starch at 80°C for 4 hours; (2) Mix citric acid and glycerin at a ratio of 1:1 After uniformity, heat at a constant temperature of 80°C for 3 hours; (3) According to the proportion of 100 parts of polylactic acid, 20 parts of polyglycolic acid (PGA), 25 parts of starch, 0.5 parts of chain extender 2-imidazolidinone, plasticizer citric acid and glycerin 10 parts Put one part into a high-speed mixer and mix evenly, wherein the mixing speed is 2500rpm, and the mixing temperature is 80°C; (4) Put the above-mentioned mixture into a twin-screw extruder to extrude and use a granulator to granulate, wherein the temperature is 220 Extrude at a speed of 150rpm at ℃, and pass through a pelletizer to obtain a composite material masterbatch. (5) Blow molding the obtained composite material masterbatch by using a blow molding machine.

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Abstract

The invention provides a PGA enhanced degradable film and a preparation method thereof. The degradable film is prepared from the following raw materials in parts by weight: 100 parts of degradable polyester, 10 to 30 parts of polyglycolic acid (PGA), 20 to 30 parts of bio-based filler, 0.2 to 1 part of a chain extender and 5 to 15 parts of a plasticizer. The preparation method comprises the steps of (1) drying the degradable polyester, the polyglycolic acid and the bio-based filler at the temperature of 60-80 DEG C for 2-4 hours; (2) mixing the plasticizer at the temperature of 60-80 DEG C for 2-4 hours; (3) putting the degradable polyester, the polyglycolic acid, the bio-based filler, the chain extender and the plasticizer into a high-speed mixer according to a ratio, and uniformly mixing at the mixing speed of 2000-3000rpm and the mixing temperature of 70-90 DEG C; (4) extruding the mixture in a double-screw extruder, granulating by using a granulator, extruding at the temperature of 200-230 DEG C at the speed of 100-200rpm, and obtaining composite material master batch after passing through a granulator; and (5) carrying out blow molding on the obtained composite material master batch by using a blow molding machine.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a PGA-enhanced degradable film and a preparation method thereof. Background technique [0002] Polyglycolic acid (PGA) is a semicrystalline aliphatic polyester with a glass transition temperature (Tg) of 35°C to 45°C and a peak melting temperature (Tm) of 220°C to 233°C. PGA has excellent mechanical properties, especially the highest elastic modulus of 6-7GPa. PGA also has a high modulus of elasticity, which is critical for providing substantial support for load-bearing applications. PGA has relatively fast degradation properties, and it has excellent air and water barrier properties. [0003] Today, with white pollution becoming more and more serious, research on degradable films has also attracted widespread attention. Polylactic acid (PLA) is the leader in the emerging bioplastics market, with the best availability and the most attractive cost structure. PLA ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L67/04C08L3/02
CPCC08J5/18C08J2367/04C08J2467/04C08J2403/02
Inventor 李洪飞朱桂阳苑会林李继伟石岩胡东良邱兆斌
Owner BEIJING UNIV OF CHEM TECH
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