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High-toughness flame-retardant PLA composite material and preparation method thereof

A composite material, PLA34.4 technology, applied in the field of high-tough flame-retardant PLA composite materials and its preparation, can solve the problems of cumbersome operation, complicated preparation process, unfavorable promotion and application, etc., to save resources, reduce costs, and suppress dripping The effect of the phenomenon

Pending Publication Date: 2020-12-15
方金丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is cumbersome to operate and the preparation process is complicated, which is not conducive to large-scale promotion and application.

Method used

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  • High-toughness flame-retardant PLA composite material and preparation method thereof
  • High-toughness flame-retardant PLA composite material and preparation method thereof
  • High-toughness flame-retardant PLA composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]

[0026]

[0027] (1) According to the above weight percentage, put the PLA pellets, phosphorus-containing flame retardant, glycerin, and TPU in a vacuum oven at 80°C for 12 hours and take them out for later use.

[0028] (2) According to the above ratio, put PLA, phosphorus flame retardant, glycerin, TPU, polytetrafluoroethylene, antioxidant 168 and processing aid into the torque rheometer at a speed of 80r / min and mix for 10min according to the ratio, Mix it well.

[0029] (3) Put the homogeneously mixed materials in the above step (2) into a twin-screw extruder with a rotating speed of 200r / min and a temperature of 180-220°C for extrusion molding, and cool and pelletize after air-drying. Specimens for limiting oxygen index, vertical combustion flame retardant test and impact performance test were prepared by laser cutting.

Embodiment 2

[0031]

[0032] (1) According to the above weight percentage, put PLA pellets, phosphorus-containing flame retardant, pentaerythritol, and PCL in a vacuum oven at 75°C for 16 hours and take them out for later use.

[0033] (2) According to the above ratio, put PLA, phosphorus flame retardant, pentaerythritol, PCL, polytetrafluoroethylene, antioxidant 168 and processing aid into the torque rheometer at a speed of 80r / min according to the ratio and mix for 10min. Mix it well.

[0034] (3) Put the homogeneously mixed material in the above step (2) into a twin-screw extruder with a rotation speed of 220r / min and a temperature of 180-220°C for extrusion molding, and cool and pelletize after air-drying. Specimens for limiting oxygen index, vertical combustion flame retardant test and impact performance test were prepared by laser cutting.

Embodiment 3

[0036]

[0037]

[0038] (1) According to the above weight percentage, put PLA pellets, silicon-containing flame retardant, glycerin: pentaerythritol = 1:1 (wt%), TPU, put them in a vacuum oven at 60°C for 24 hours and take them out for later use.

[0039] (2) According to the above proportions, put PLA, silicon-containing flame retardant, glycerin: pentaerythritol = 1:1 (wt%), TPU, polytetrafluoroethylene, antioxidant 1010 and processing aids according to the proportion into the rotating speed of 90r / min in a torque rheometer for 7 minutes to make it evenly mixed.

[0040] (3) Put the homogeneously mixed material in the above step (2) into a twin-screw extruder with a rotation speed of 220r / min and a temperature of 180-220°C for extrusion molding, and cool and pelletize after air-drying. Specimens for limiting oxygen index, vertical combustion flame retardant test and impact performance test were prepared by laser cutting.

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Abstract

The invention relates to the field of high polymer materials, in particular to a high-toughness flame-retardant PLA composite material and a preparation method thereof. The composite material comprises the following raw materials in percentage by weight: 34.4%-89.3% of PLA, 5.0%-20.0% of a flame retardant, 1.0%-15.0% of a charring agent, 5.0%-20.0% of a toughening agent, 1.0%-5.0% of an anti-dripping agent, 0.2%-1.0% of an antioxidant and 0.5%-1.5% of a processing aid. The preparation method mainly comprises the following steps: mixing the components of the high-toughness flame-retardant PLA composite material through a torque rheometer, and carrying out twin-screw extrusion granulation or compression molding through a full-automatic tablet press to obtain the high-toughness flame-retardant PLA composite material. The flame retardant adopted in the invention is halogen-free. The material is low in toxicity and conforms to the development concept of environmental protection; the flame retardant, the charring agent and the anti-dripping agent are added at the same time, so the dripping phenomenon in the PLA combustion process can be effectively inhibited, the flexibilizer with good compatibility with PLA is added, introduction of the compatilizer is avoided, resources are saved, and the cost is reduced. Due to the introduction of the toughening agent, the toughness of the PLA composite material is improved, and meanwhile, due to good biocompatibility, the PLA composite material is well dispersed in a PLA matrix, and the mechanical property of PLA is not influenced.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-tough flame-retardant PLA composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a product obtained by further polymerization of lactic acid produced by natural renewable raw materials through microbial fermentation. It has good biodegradable properties and can be completely decomposed by microorganisms in nature to form carbon dioxide and water. It will not cause "white pollution" after use. It is a recognized environmentally friendly material and is in line with green, environmental protection and renewable development. idea. However, PLA is flammable, and its limiting oxygen index (LOI) is as low as 20.4%. It is an extremely flammable material in the air, and its combustion process is often accompanied by severe melting and dripping. Once burned, it will be harmful to human life and health. Property security poses a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L27/18C08L75/04C08L67/02C08K13/02C08K5/053C08K5/3492
CPCC08L67/04C08L2201/02C08L2201/22C08L2205/06C08L2207/04C08L2203/20C08L2205/03C08L2205/02C08L2205/025C08L2205/035C08K2201/014
Inventor 方金丹
Owner 方金丹
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