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Heat-resistant modified polylactic acid material and preparation method thereof

A polylactic acid material and modification technology, which is applied in the field of heat-resistant modified polylactic acid material and its preparation, can solve problems such as difficult processing, high brittleness, and difficulty, and achieve improved mechanical stress, improved heat resistance, and excellent The effect of mechanical properties

Pending Publication Date: 2021-12-28
宁波昌亚新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Polylactic acid has poor temperature resistance. The heat distortion temperature of non-annealed PLA is usually lower than 60 degrees. It has high brittleness and is not easy to process and shape, which causes great difficulties in actual production and application; traditional polylactic acid is generally hard, brittle, and insufficient in strength. , the defect that its mechanical strength is difficult to take into account

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  • Heat-resistant modified polylactic acid material and preparation method thereof
  • Heat-resistant modified polylactic acid material and preparation method thereof
  • Heat-resistant modified polylactic acid material and preparation method thereof

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preparation example Construction

[0034] A preparation method of heat-resistant modified polylactic acid material, such as figure 2 , the method includes:

[0035] S1. Mix lactide, catalyst, chitosan and single-walled carbon nanotubes, and disperse and form them to obtain polylactic acid with single-walled carbon nanotubes;

[0036] S2. Blending and molding single-walled carbon nanotube polylactic acid, polyimide, flame retardant and toughening agent in a molten state to obtain a blank;

[0037] S3, irradiating, stretching, cooling and solidifying the blank to obtain a polylactic acid material.

[0038] In the embodiment of the present application, carbon nanotube polylactic acid, polyimide, flame retardant and toughening agent are blended in a molten state, and corresponding compatibilizers or crosslinking agents can be added for reaction.

[0039] In the examples of this application, the stretching treatment can also increase the crystallinity of the polylactic acid blend material to 45-68%. The increase ...

Embodiment 1

[0063] A heat-resistant modified polylactic acid material, in parts by weight, the components of the polylactic acid material include: 50g lactide, 2g catalyst, 10g chitosan, 10g single-walled carbon nanotubes, 10g polyamide Imine, 3g flame retardant, 0.5g toughening agent. The polyimide is a polyimide containing an asymmetric indole structure, wherein the general chemical formula is:

[0064]

[0065] N is 8.

[0066] The catalyst includes alumina. The toughening agent comprises ethylene-methyl acrylate-glycidyl methacrylate random copolymer. The mass ratio of the toughening agent and single-walled carbon nanotube polylactic acid blended is 1:50. The polyimide is a polyimide containing an asymmetric indole structure. Add chitosan (molecular weight: 300,000, degree of deacetylation: 60%) into the reaction vessel, add lactide, catalyst, chitosan and single-walled carbon nanotubes, mix and disperse for 3 hours, heat the reaction product to 120°C and dry for 2 hours Obtai...

Embodiment 2

[0068] A heat-resistant modified polylactic acid material, in parts by weight, the components of the polylactic acid material include: 80g lactide, 4g catalyst, 30g chitosan, 26g single-walled carbon nanotubes, 20g polyamide Imine, 9g flame retardant, 1g toughening agent.

[0069] The melting and the stretching are each carried out above the glass transition temperature of the billet. The crystallization temperature in the cooling and solidification is 155° C., and the cooling and solidification of the catalyst includes alumina. The toughening agent comprises a hydrogenated polystyrene-polybutadiene-polystyrene triblock copolymer. The mass ratio of the toughening agent and polylactic acid blended with single-walled carbon nanotubes is 1:95. The polyimide is a polyimide containing an asymmetric indole structure.

[0070] Add chitosan (molecular weight: 300,000, degree of deacetylation: 70%) into the reaction vessel, add lactide, catalyst, chitosan and single-walled carbon na...

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Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to a heat-resistant modified polylactic acid material and a preparation method thereof. The polylactic acid material is prepared from the following components in parts by weight: 50 to 80 parts of lactide, 2 to 4 parts of a catalyst, 10 to 30 parts of chitosan, 10 to 26 parts of single-walled carbon nanotubes, 10 to 20 parts of polyimide, 3 to 9 parts of a flame retardant and 0.5 to 1 part of a toughening agent. The material is wide in raw material source, excellent in processability, good in high temperature resistance and excellent in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and specifically refers to a heat-resistant modified polylactic acid material and a preparation method thereof. Background technique [0002] Polylactic acid is an environmentally friendly plastic derived from biomass. It has the advantages of excellent biocompatibility, biodegradability and processability. It has the reputation of "green plastic" and has received more and more people's attention. focus on. However, polylactic acid still has problems such as brittleness, low toughness, and poor heat resistance, and the notched impact strength value is lower than 4KJ / m 2 , which severely limits the wide application of PLA materials in various fields. Therefore, the research on the modification of polylactic acid materials is increasingly becoming a hotspot, especially for various toughening modifications. [0003] PLA is a polyester with poor hydrophilicity. Its degradation rate is sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L79/08C08L5/08C08K3/04C08G63/08C08G63/84C08G63/85C08J3/28C08J3/24
CPCC08L67/04C08G63/08C08G63/84C08G63/85C08J3/28C08J3/246C08K2201/011C08L2201/08C08J2367/04C08J2479/08C08L79/08C08L5/08C08K3/041
Inventor 徐建海王美兰
Owner 宁波昌亚新材料科技股份有限公司
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