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High-heat-resistance bio-based degradable polylactic acid modified material and preparation method thereof

A modified material, polylactic acid technology, applied in the field of high heat-resistant bio-based degradable polylactic acid modified material and its preparation, can solve the problems of tableware with poor heat resistance, unstable strength, and easy breakage , to achieve the effect of increasing heat distortion temperature, improving heat resistance and increasing crystallinity

Pending Publication Date: 2022-07-01
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, PLA has become a mainstream biodegradable plastic used in food, but the tableware made of PLA materials still has problems such as poor heat resistance, unstable strength, and easy breakage or damage.

Method used

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  • High-heat-resistance bio-based degradable polylactic acid modified material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) PLA-LX175 and N-phenylmaleimide were dried at 60° C. for 6 hours and set aside for use;

[0029] (2) after drying, take PLA-LX175 (95 parts by weight) and N-phenylmaleimide (5 parts by weight), then take by weighing nucleating agent: aromatic sulfonate ( LAK-300) (0.2 parts by weight), chain extender: ADR-4300 (1.5 parts by weight), stabilizer: di-tert-butyl peroxide (0.5 parts by weight), lubricant: Ethylene-vinyl acetate copolymer (2 parts by weight), antioxidant: antioxidant 1010 (0.2 part by weight) was added to the high-speed mixer successively and stirred for 5 to 8 minutes, and discharged for use;

[0030] (3) adding the mixed material of step (2) into the twin-screw extruder to carry out melt blending extrusion, cooling, and pelletizing to obtain this product; wherein, the rotating speed of the described high-speed mixer is 1200 rev / min; The temperature range of the twin-screw extruder is 150°C-190°C.

[0031] The heat distortion temperature of the obtaine...

Embodiment 2

[0033] (1) PLA-LX175 and N-phenylmaleimide were dried at 60° C. for 6 hours and set aside for use;

[0034] (2) after drying, take PLA-LX175 (95 parts by weight) and N-phenylmaleimide (8 parts by weight), then take by weighing nucleating agent: aromatic sulfonate ( LAK-300) (0.4 parts by weight), chain extender: ADR-4300 (1.8 parts by weight) stabilizer: di-tert-butyl peroxide (0.8 parts by weight), lubricant: ethylene -vinyl acetate copolymer (3 parts by weight), antioxidant: antioxidant 1010 (0.5 part by weight) was added to the high-speed mixer successively and stirred for 5 to 8 minutes, and the material was discharged for use;

[0035] (3) adding the mixed material of step (2) into the twin-screw extruder to carry out melt blending extrusion, cooling, and pelletizing to obtain this product; wherein, the rotating speed of the described high-speed mixer is 1200 rev / min; The temperature range of the twin-screw extruder is 150°C-190°C.

[0036] The heat distortion temperatu...

Embodiment 3

[0038] (1) Dry PLA-LX175 and polyimide at 60°C for 6 hours and set aside for use;

[0039] (2) After drying, take PLA-LX175 (95 parts by weight) and polyimide (10 parts by weight), then take by weighing the nucleating agent: talcum powder (0.4 parts by weight), expanding Chain agent: ADR-4385 (2 parts by weight), stabilizer: di-tert-butyl peroxide (0.8 parts by weight), lubricant: ethylene-vinyl acetate copolymer (3 parts by weight) ), antioxidant: antioxidant 1010 (1 part by weight) was added to the high-speed mixer successively and stirred for 5 to 8 minutes, and the material was discharged for use;

[0040] (3) adding the mixed material of step (2) into the twin-screw extruder to carry out melt blending extrusion, cooling, and pelletizing to obtain this product; wherein, the rotating speed of the described high-speed mixer is 1200 rev / min; The temperature range of the twin-screw extruder is 150°C-190°C.

[0041] The heat distortion temperature of the obtained high heat-re...

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Abstract

The invention provides a high-heat-resistance bio-based degradable polylactic acid modified material and a preparation method thereof, and the modified material is prepared from the following materials in parts by weight: 85-95 parts of polylactic acid, 5-15 parts of resin of a five-membered cyclic monomer with a 1, 2-disubstituted vinyl structure, 1.5-3 parts of a chain extender, 0.1-1 part of a nucleating agent, 0.5-1 part of a stabilizer and 2-4 parts of a lubricant. And 0.2 to 1.5 parts of an antioxidant. According to the high-heat-resistance bio-based degradable polylactic acid modified material prepared by the invention, the crystallization rate and crystallinity of PLA are improved by adding the nucleating agent, so that the thermal deformation temperature and heat resistance of PLA are improved, and the heat resistance of PLA is improved by adding the resin of the five-membered cyclic monomer with a 1, 2-disubstituted vinyl structure. The internal rotation resistance of the chain can be increased by embedding the polymer into the macromolecular chain, so that the heat resistance of the polymer is further improved.

Description

technical field [0001] The invention relates to the field of biodegradable polymer materials, in particular to a highly heat-resistant bio-based degradable polylactic acid modified material and a preparation method thereof. Background technique [0002] In recent years, with the stricter requirements for carbon emissions, countries around the world have paid more and more attention to the control of petroleum-based polymer materials, and biodegradable materials have outstanding advantages. Among them, polylactic acid (PLA), as a source of Renewable resource thermoplastic aliphatic polyester not only has good biodegradability and biocompatibility, but also has very excellent mechanical strength and processing properties, so PLA has demonstrated both in the field of general plastics and biomedical materials. broad application prospects. However, the high cost, poor heat resistance, and low flexibility of PLA limit the application range of PLA. [0003] Usually, the heat dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L79/08C08K5/42C08K5/3415C08K3/34C08K3/26C08K5/25
CPCC08L67/04C08L2201/08C08L2201/06C08L2205/24C08K2003/265C08L79/08C08K5/42C08K5/3415C08K3/34C08K3/26C08K5/25
Inventor 邵羽静文许红森朱晨杰龙浩宇梁国超蒋天尘朱莹莹李康金俊阳肖红杰梁国伟庄伟
Owner NANJING TECH UNIV
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