Biodegradable PLA film and preparation method thereof

A biodegradable and PLA technology, applied in the field of biodegradable PLA film and its preparation, can solve the problems of easy adhesion of PLA film, unfavorable performance control and stability, large difference in fluidity, etc., to solve the serious problem of brittleness, Effects of improving processing stability and improving compatibility

Active Publication Date: 2022-01-21
SINOCHEM QUANZHOU ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of PLA film modification research is that PLA is severely brittle. Blending modification is used, and the compatibility between various polymer materials is poor, resulting in limited performance improvement of blending modification effects; different polymer materials have different melting temperatures. , and the difference in fluidity is large, which makes the processing technology difficult to control and causes uneven film thickness; PLA films are easy to stick together and difficult to open, and PLA is a semi-crystalline polymer with slow crystallization, which is not conducive to performance control. and stable

Method used

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  • Biodegradable PLA film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A preparation method of biodegradable PLA film:

[0041] (1) Dry PLA and PBC at 70°C for 5 hours;

[0042] (2) Preparation of bio-based opening agent (nucleating agent):

[0043] Rinse the discarded egg shells, put them in an oven, and dry them for 5 hours at a temperature of 110°C. Take them out and cool them to room temperature, and use a ball mill to crush them into egg shell powders with a particle size of 2 μm.

[0044] Phenylphosphonic acid and egg shell powder were vacuum-dried at 110 °C for 4 h. After drying, the two substances were fully ground with a mortar at a mass-to-part ratio of 1:5 at room temperature, so that the two substances were evenly mixed. Then the fully mixed powder was placed in an oven at 180 °C for 5 min to obtain a bio-based calcium carbonate nucleating agent loaded with phenylphosphonic acid.

[0045] Put the egg shell powder loaded with phenylphosphonic acid into a high-speed mixer, configure the silane coupling agent KH550 into a 20wt%...

Embodiment 2

[0051] A preparation method of biodegradable PLA film:

[0052] (1) Dry PLA and PBC at 70°C for 5 hours;

[0053] (2) using the bio-based opening agent (nucleating agent) of Example 1;

[0054] (3) After drying, 75 parts of PLA, 14 parts of PBC, 5 parts of tung oil anhydride, 0.5 parts of zinc stearate, 0.5 parts of epoxy acrylic copolymer, and 5 parts of bio-based anti-blocking agent were mechanically blended in a high mixer. Mix for 10 minutes;

[0055] (4) Feed the homogeneously mixed material in step (3) into a twin-screw extruder for melt plasticization, extrusion, water cooling, pelletizing, and drying to obtain modified polylactic acid blown film special resin; extruded pelletized The conditions are: the set temperature of the twin-screw extruder is: zone 1: 80°C, zone 2: 160°C, zone 3: 180°C, zone 4: 180°C, zone 5: 180°C, zone 6: 180°C, Zone 7: 180°C, Zone 8: 180°C, Zone 9: 180°C, Zone 10: 180°C, Zone 11: 180°C, Head: 170°C, Screw speed: 200rpm.

[0056] (5) The mo...

Embodiment 3

[0059] A preparation method of fully degradable PLA film:

[0060] (1) Dry PLA and PBC at 70°C for 5 hours;

[0061] The bio-based opening agent (nucleating agent) of Example 1 was used.

[0062] (3) After drying, 80 parts of PLA, 9 parts of PBC, 5 parts of tung oil anhydride, 0.5 parts of zinc stearate, 0.5 parts of epoxy acrylic copolymer, and 5 parts of bio-based anti-blocking agent were mechanically blended in a high mixer. Mix for 10 minutes;

[0063] (4) Feed the homogeneously mixed material in step (3) into a twin-screw extruder for melt plasticization, extrusion, water cooling, pelletizing, and drying to obtain modified polylactic acid blown film special resin; extruded pelletized The conditions are: the set temperature of the twin-screw extruder is: zone 1: 80°C, zone 2: 160°C, zone 3: 180°C, zone 4: 180°C, zone 5: 180°C, zone 6: 180°C, Zone 7: 180°C, Zone 8: 180°C, Zone 9: 180°C, Zone 10: 180°C, Zone 11: 180°C, Head: 170°C, Screw Speed: 200rpm.

[0064] (5) The m...

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Abstract

The invention discloses a biodegradable polylactic acid film and a preparation method thereof. The biodegradable polylactic acid film comprises the following components: 70-95 parts of polylactic acid (PLA), 4-29 parts of poly (butyl carbonate) (PBC), 0.1-1 part of a chain extender epoxy acrylic copolymer, 0.1-10 parts of a plasticizer tung oil anhydride, 0.1-1 part of a heat stabilizer zinc stearate and 0.1-5 parts of a nucleating agent phenyl phosphonic acid loaded calcium carbonate powder. The preparation method comprises the steps of uniformly mixing the raw materials in proportion, carrying out melt blending by a twin-screw extruder to obtain the modified polylactic acid film blowing special resin, and carrying out blow molding by a film blowing machine to form the film. The PLA film prepared by the method has high tensile strength, good opening performance and good transparency.

Description

technical field [0001] The invention relates to the technical field of polymer material preparation, in particular to a biodegradable PLA film and a preparation method thereof. Background technique [0002] Among the industrialized degradable plastics, polylactic acid (PLA) has become a hot material to replace disposable plastic products due to its excellent performance and biodegradability. PLA comes from renewable resources. It uses starch extracted from plants as the initial raw material, and then it is fermented to obtain lactic acid, which is then produced through polymerization. PLA gets rid of the dependence on petroleum resources, and has complete degradation characteristics, realizing clean carbon. Recycling, in today's increasingly tense environment protection and resource utilization, it is more and more important to develop and expand the application of PLA. PLA has the characteristics of high modulus, high strength, good transparency and excellent processing pe...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L67/02C08K5/1539C08K9/12C08K3/26C08K9/06C08J5/18
CPCC08J5/18C08J2367/04C08J2467/02C08K5/1539C08K9/12C08K2003/265C08K9/06Y02W90/10
Inventor 武丹丹张永恒史顺祥徐人威
Owner SINOCHEM QUANZHOU ENERGY TECH CO LTD
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