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Polylactic acid composite material, automobile rear floor and preparation method

A composite material and polylactic acid technology, applied in the field of composite materials, can solve the problems of heavy and complex rear floors, and achieve the effects of light weight, high heat resistance and mechanical strength, and easy installation.

Active Publication Date: 2020-09-04
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method requires operations such as cutting and welding, which is relatively complicated. On the other hand, the rear floor of a car made of traditional steel is generally heavy

Method used

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  • Polylactic acid composite material, automobile rear floor and preparation method
  • Polylactic acid composite material, automobile rear floor and preparation method
  • Polylactic acid composite material, automobile rear floor and preparation method

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preparation example Construction

[0077] The embodiment of the present invention also provides a preparation method of polylactic acid composite material, comprising:

[0078] S100, vacuum drying the polylactic acid particles to obtain dried polylactic acid particles;

[0079] S200, adding dry polylactic acid particles, fillers, seaweed fibers, nucleating agents, hydrolysis inhibitors and anti-aging agents into the mixer according to the component ratio, stirring and mixing to obtain a mixed material; and

[0080] S300, adding the mixed material into a twin-screw extruder for melt blending, extruding, air cooling, and pelletizing to obtain a polylactic acid composite material.

[0081] In step S100, the vacuum drying temperature may be 50°C-70°C, the vacuum degree may be ≤0.1MPa, and the time may be 3h-8h.

[0082] In step S200, the stirring speed of the mixer may be 100r / min-2500r / min, and the mixing time may be 5min-30min.

[0083] In step S300, the screw speed of the twin-screw extruder may be 20r / min-180...

Embodiment 1

[0101] This embodiment provides a polylactic acid composite material, and the automobile rear floor is prepared by using the polylactic acid composite material. The steps involved are as follows:

[0102] Dry polylactic acid particles with a molecular weight of 300,000 in an oven at 50°C and a vacuum of 0.1 MPa for 6 hours to obtain dried polylactic acid particles;

[0103]The dried polylactic acid particles obtained in the above steps, filler 3000 mesh calcium carbonate powder, seaweed fiber, nucleating agent phthalimide, hydrolysis inhibitor N,N-diisopropylcarbodiimide and The anti-aging agent is weighed according to the mass percentage of 85%, 6%, 5%, 2%, 1%, and 1% of the total mixture, and added to the mixer, and stirred for 30min under the condition of 100r / min to obtain a uniform mixture. Mixed material, wherein the anti-aging agent is a mixture of benzophenone and hindered amine antioxidant with a mass ratio of 1:1, the diameter of the seaweed fiber is 0.4 μm, the len...

Embodiment 2

[0108] This embodiment provides a polylactic acid composite material, and the automobile rear floor is prepared by using the polylactic acid composite material. The steps involved are as follows:

[0109] Dry polylactic acid particles with a molecular weight of 250,000 in an oven at 60°C and a vacuum of 0.1 MPa for 7 hours to obtain dried polylactic acid particles;

[0110] The dried polylactic acid particles obtained in the above steps, filler 6000 mesh talcum powder, seaweed fiber, nucleating agent phthalimide, hydrolysis inhibitor N,N-diisopropylcarbodiimide and anti- The aging agent is weighed according to 80%, 5%, 12%, 1.7%, 0.8%, and 0.5% of the total mass percentage of the mixture, and added to the mixer, and stirred for 25 minutes under the condition of 500r / min to obtain a well-mixed mixture The antioxidant is a mixture of benzophenone and hindered amine antioxidant with a mass ratio of 1:1, the diameter of the seaweed fiber is 0.4 μm, the length is 1000 μm, the dry ...

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Abstract

The invention provides a polylactic acid composite. The polylactic acid composite is prepared from, by mass, 50-85% of polylactic acid particles, 5-25% of filler, 5-25% of alginate fiber, 0.5-2% of nucleating agent, 0.4-1% of hydrolysis inhibitor and 0.1-1% of antiaging agent; the diameter of the alginate fiber is 0.4-0.8 micrometer, the length of the alginate fiber is 1000-1500 micrometers, the dry state breaking strength of the alginate fiber is greater than or equal to 1.50 cN / dtex, and the defect content of the alginate fiber is 30.0 milligram per 100 gram. The invention further provides apreparation method of the polylactic acid composite, vacuum drying is carried out on the polylactic acid particles to obtain dried polylactic acid particles; the dried polylactic acid particles, thefiller, the alginate fiber, the nucleating agent, the hydrolysis inhibitor and the antiaging agent are added into an agitator according to the component ratio, and stirring and blending are carried out to obtain a mixed material; the mixed material is added into a double-screw extruder for melt blending, and extruding, air cooling and grain cutting are carried out to obtain the polylactic acid composite. The invention further provides an automobile back floor and a preparation method thereof.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a polylactic acid composite material, an automobile rear floor and a preparation method. Background technique [0002] Polylactic acid resin is a polymer material obtained by chemical synthesis or biosynthesis using lactic acid as a monomer. Its raw materials are mainly corn and other crops. It has the advantages of wide sources, low price, and low carbon emissions. In terms of safety, polylactic acid is non-toxic and non-irritating, has excellent transparency and biodegradability, and is easily decomposed and metabolized by various microorganisms in nature or enzymes in animals and plants, and finally forms carbon dioxide and water, with little environmental impact. Ideal green polymer material. In addition, compared with other biodegradable polymers, polylactic acid has the advantages of high strength and high modulus, and has good solvent resistance. It can be pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08L5/04C08K13/02C08K3/26C08K5/3417C08K5/29C08K5/07
CPCC08K2003/265C08L67/04C08L2201/08C08L5/04C08K13/02C08K3/26C08K5/3417C08K5/29C08K5/07
Inventor 陈大华潘立升秦玉林李乐铭海滨
Owner CHERY AUTOMOBILE CO LTD
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