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Preparation method of chitosan-modified polylactic acid material by γ-ray irradiation

A polylactic acid material and chitosan modification technology are applied in the field of γ-ray irradiation preparation of chitosan modified polylactic acid material, which can solve the problems of further improvement of tensile strength, poor impact strength, etc. Thermal and mechanical properties, lowering glass transition temperature and improving hydrophilicity

Active Publication Date: 2019-05-14
广州华大生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the chitosan-modified polylactic acid material prepared by this method has good thermodynamic properties, the gel fraction is 60%-85%, the glass transition temperature is 64°C-70°C, and the tensile strength is 68MPa-79MPa. The tensile strength needs to be further improved, and the impact strength is poor

Method used

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  • Preparation method of chitosan-modified polylactic acid material by γ-ray irradiation
  • Preparation method of chitosan-modified polylactic acid material by γ-ray irradiation
  • Preparation method of chitosan-modified polylactic acid material by γ-ray irradiation

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Effect test

Embodiment 1

[0031] Embodiment 1, a kind of gamma ray irradiation preparation method of chitosan modified polylactic acid material

[0032] The γ-ray irradiation preparation method of the chitosan modified polylactic acid material comprises the following steps:

[0033] S1 adds mixed alcohol liquid to chitosan, the addition amount of mixed alcohol liquid is 15 times of above-mentioned chitosan quality, described mixed alcohol liquid is made up of isopropanol and dehydrated alcohol by volume ratio 4:1, swells 1h, get swelling solution;

[0034] S2 vanillin is dissolved in dehydrated alcohol, and the quality of vanillin is 2 times of chitosan quality described in step S1, and the quality of dehydrated alcohol is 4 times of vanillin quality, obtains vanillin solution, above-mentioned vanillin The solution is uniformly added dropwise to the swelling liquid obtained in step S1, the dropping time is 1 h, the ultrasonic reaction is 3 h, the ultrasonic reaction temperature is 60° C., and the ultr...

Embodiment 2

[0037] Embodiment 2, a kind of gamma ray irradiation preparation method of chitosan modified polylactic acid material

[0038] The γ-ray irradiation preparation method of the chitosan modified polylactic acid material comprises the following steps:

[0039] S1 adds mixed alcohol liquid to chitosan, the addition amount of mixed alcohol liquid is 20 times of above-mentioned chitosan quality, described mixed alcohol liquid is made up of isopropanol and dehydrated alcohol by volume ratio 4: 1, swells 1h, get swelling solution;

[0040] S2 vanillin is dissolved in dehydrated alcohol, and the quality of vanillin is 2 times of chitosan quality described in step S1, and the quality of dehydrated alcohol is 4 times of vanillin quality, obtains vanillin solution, above-mentioned vanillin The solution is uniformly added dropwise to the swelling liquid obtained in step S1, the dropping time is 1 h, the ultrasonic reaction is 3 h, the ultrasonic reaction temperature is 60° C., and the ult...

Embodiment 3

[0043] Embodiment 3, a kind of gamma ray irradiation preparation method of chitosan modified polylactic acid material

[0044] The γ-ray irradiation preparation method of the chitosan modified polylactic acid material comprises the following steps:

[0045] S1 adds mixed alcohol liquid to chitosan, the addition amount of mixed alcohol liquid is 18 times of above-mentioned chitosan quality, described mixed alcohol liquid is made up of isopropanol and dehydrated alcohol by volume ratio 4:1, swells 1h, get swelling solution;

[0046] S2 vanillin is dissolved in dehydrated alcohol, and the quality of vanillin is 2 times of chitosan quality described in step S1, and the quality of dehydrated alcohol is 4 times of vanillin quality, obtains vanillin solution, above-mentioned vanillin The solution is uniformly added dropwise to the swelling liquid obtained in step S1, the dropping time is 1 h, the ultrasonic reaction is 3 h, the ultrasonic reaction temperature is 60° C., and the ultr...

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Abstract

The invention belongs to the technical field of material modification, and in particular relates to a gamma-ray irradiation preparation method of a chitosan-modified polylactic acid material. The gamma ray irradiation preparation method of chitosan modified polylactic acid material provided by the invention comprises: adding mixed alcohol solution to chitosan, swelling, to obtain swelling liquid; vanillin solution is evenly added dropwise in the swelling liquid, ultrasonically reaction, filter the reaction product, wash, and dry to obtain modified chitosan; add hydrogen peroxide solution to the modified chitosan, soak, add multifunctional additives, and stir evenly to obtain mixed solution A; polylactic acid Add to mixed solution A, stir evenly, add glycerin and triallyl isocyanurate, stir evenly to obtain mixed solution B, add mixed solution B into a polyethylene bag, and perform irradiation treatment. The preparation method of the chitosan-modified polylactic acid material of the invention is simple and easy to operate, has low cost and high production efficiency, and the prepared chitosan-modified polylactic acid material has good fluidity and hydrophilicity.

Description

technical field [0001] The invention belongs to the technical field of material modification, and in particular relates to a gamma-ray irradiation preparation method of a chitosan-modified polylactic acid material. Background technique [0002] Polylactic acid is a type of polymer material that is produced by fermentation of biomass such as corn and straw, and then chemically synthesized with lactic acid as a monomer. Polylactic acid is a fully biodegradable polyester polymer material. Under natural conditions, polylactic acid and its products are stable, but under composting conditions, they can be completely decomposed into carbon dioxide and water, which is neither like the degradation cycle required by polystyrene in a natural environment, nor like ordinary polyethylene. Degradable plastics just disintegrate into fragments and still exist in the environment in the form of broken plastics. Coming from nature, returning to nature is the characteristic of polylactic acid ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/28C08L5/08C08L67/04C08B37/08C08K3/38C08K5/098C08K3/32
CPCC08B37/003C08J3/28C08J2367/04C08J2405/08C08K3/38C08K5/098C08K2003/325
Inventor 邹伟权万利秀辜英杰
Owner 广州华大生物科技有限公司