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Full-biodegradable polylactic acid composite material and preparation method thereof

A technology of composite materials and polylactic acid, which is applied in the field of polymer composite materials and its preparation, can solve the problems of limiting the engineering processing and application development of polylactic acid, the complex molecular weight distribution range of polylactic acid structure, and the low heat-resistant deformation temperature. Small damage, good toughening effect, and the effect of improving toughness and heat resistance

Inactive Publication Date: 2011-04-06
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the complex structure of polylactic acid and the wide range of molecular weight distribution, especially polylactic acid has poor toughness (notched impact strength is only about 3kJ / m2), low heat deformation temperature (heat resistance deformation temperature is only about 55 ℃), etc. The main problem greatly limits the engineering processing and application development of polylactic acid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Proportion: 93 parts of polylactic acid, 5 parts of polybutylene succinate, 1 part of dioctyl phthalate, 1 part of hemp fiber, tetrakis (β-(3,5 di-tert-butyl 0.1 part of pentaerythritol -4-hydroxyphenyl)propionate and 0.1 part of vinyltrichlorosilane.

[0030] Its preparation method is:

[0031] (1) The coiled hemp fiber is treated with vinyltrichlorosilane at a concentration of 0.1%, and dried in an air blast drying oven at 80°C.

[0032] (2) Vacuum-dry polylactic acid and polybutylene succinate at 50° C. for 8 hours, respectively, to make the water content less than 0.02%, so as to remove water.

[0033] (3) Combine the dried polylactic acid and polybutylene succinate obtained in step (2) with dioctyl phthalate, tetrakis (β-(3,5 di-tert-butyl-4-hydroxybenzene) Base) propionate) pentaerythritol ester is stirred in a dry high-speed mixer according to the proportion to make it evenly mixed, and then reacted in a twin-screw extruder, the screw speed is 180rpm, and the e...

Embodiment 2

[0035] Ratio: 50 parts of polylactic acid, 40 parts of polybutylene succinate grafted polylactic acid copolymer, 4 parts of polyethylene glycol, 5 parts of bamboo fiber, (3,5-di-tert-butyl 1 part of stearyl-4-hydroxyphenyl) propionate, and 0.5 part of γ-methacryloxytrimethoxysilane.

[0036] (1) Bamboo fibers with an aspect ratio of 5 were treated with 0.5% γ-methacryloxytrimethoxysilane and dried in a forced air oven at 80°C.

[0037] (2) Dry polylactic acid and polybutylene succinate grafted polylactic acid copolymer in vacuum at 60° C. for 5 hours, respectively, to make the water content less than 0.02%, and remove water.

[0038] (3) The dried polylactic acid obtained in step (2) and polybutylene succinate grafted polylactic acid copolymer with polyethylene glycol, (3,5-di-tert-butyl-4-hydroxybenzene Base) Stearyl propionate was stirred in a dry high-speed mixer according to the proportioning ratio to make it evenly mixed, and then reacted in a twin-screw extruder, the sc...

Embodiment 3

[0040] Book: 40 parts of polylactic acid, 18 parts of ethyl acrylate-butyl acrylate-acrylic acid terpolymer, 10 parts of diethyl phthalate, 30 parts of palm fiber, anti-β-(3,5 - 2 parts of cyclohexyl di-tert-butyl-4-hydroxyphenyl) propionate, and 0.8 parts of γ-aminopropyltriethoxysilane.

[0041] Its preparation method is:

[0042] (1) The palm fiber with an aspect ratio of 30 was treated with 1% γ-aminopropyltriethoxysilane and dried in a forced air drying oven at 80°C.

[0043] (2) Vacuum dry the polylactic acid and ethyl acrylate-butyl acrylate-acrylic acid terpolymer at 80°C for 3 hours, respectively, so that the moisture content is less than 0.02%, so as to remove moisture.

[0044] (3) the dried polylactic acid obtained in step (2) and ethyl acrylate-butyl acrylate-acrylic acid terpolymer with plasticizer diethyl phthalate, antioxidant β-(3,5 -Di-tert-butyl-4-hydroxyphenyl) cyclohexyl propionate is stirred in a dry high-speed mixer according to the weight ratio, so th...

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Abstract

The invention discloses a full-biodegradable polylactic acid composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 40-93 parts of polylactic acid, 5-40 parts of flexibilizer, 1-10 parts of plasticizer, 1-30 parts of vegetable fibre, 0.1-2 parts of antioxygen and 0.1-1 part of silane coupling agent. In the invention, the vegetable fibre composite polylactic acid is modified, which can enhance the mechanical property and the heat resistance of the polylactic acid material, and moreover, the polylactic acid material can be fully degraded, and the raw materials of the polylactic acid material are renewable and abundant; a lateral feed mode is applied to the fiber, therefore, the damage of a screw to the fibre is smaller, the strengthening and toughening effects of the fibre are better. Polydiethylene glycol sebacate (PBS), grafted with a polylactic acid copolymer, serves as the flexibilizer, which not only greatly improves the compatibility of the PBS and the polylactic acid but also can improve the toughness and the heat resistance of the composite material.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials and their preparation, and in particular relates to a fully biodegradable polylactic acid composite material and a preparation method thereof. Background technique [0002] Biomass conversion is an important direction for the development of the international biomass industry. The depletion and pollution of petrochemical resources have promoted the development of natural polymer materials. As an aliphatic polyester, polylactic acid is a bio-based polymer synthesized from renewable biomass resources (starch, etc.) rather than petroleum resources. It not only gets rid of the dependence on petroleum resources, but also its production The process brings a small load on the environment, coupled with its certain mechanical properties, good thermoplasticity, compostability, especially its complete degradability and renewable raw material sources, it has attracted widespread attention. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L97/02C08L67/02C08K5/12C08K5/5425C08K5/134
Inventor 张正光
Owner CHERY AUTOMOBILE CO LTD
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