High-performance polylactic acid nano composite material and preparation method thereof

A nanocomposite material, polylactic acid technology, applied in the field of high-performance polylactic acid nanocomposite material and its preparation, can solve the problems of barrier property, hinder the application of polylactic acid, low hydrophilicity, etc., and achieve easy control and excellent ultraviolet shielding. Performance, effect of low hydrophilicity

Active Publication Date: 2021-01-19
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the applicability of PLA is hampered by its technical properties such as friability, hydrophilicity and low barrier properties, which hinder the application of PLA in packaging

Method used

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  • High-performance polylactic acid nano composite material and preparation method thereof

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preparation example Construction

[0020] The preparation method of the cellulose nanocrystal (diameter is 5-20nm, length is 100-500nm) modified by zinc complex comprises the following steps:

[0021] Disperse cellulose nanocrystals in a mixed solvent of deionized water and DMF, stir for 10 minutes to mix evenly, then add zinc chloride, and stir for 30 minutes to obtain a uniform dispersion; then 1,2-benzisothiazole-3 - adding the ketone to the above dispersion, stirring for 30 minutes, placing it in a constant temperature water bath at 70°C for 12 hours, then centrifuging, washing, and drying to obtain cellulose nanocrystals modified with zinc complexes;

[0022] The mass ratio of the cellulose nanocrystal, zinc chloride, 1,2-benzisothiazol-3-one, deionized water and DMF is 4:3:6:500:500.

Embodiment 1

[0024] A high-performance polylactic acid nanocomposite material is composed of the following components by weight: 99 parts of polylactic acid and 1 part of cellulose nanocrystal modified by zinc complex.

[0025] The preparation method comprises the steps of:

[0026] (1) Disperse 1 part of cellulose nanocrystals modified by zinc complexes in 1500 parts of dichloromethane, sonicate for 3 hours at room temperature, and stir for 3 hours to obtain a uniform dispersion of cellulose nanocrystals modified by zinc complexes, which is set aside;

[0027] (2) 99 parts of polylactic acid are added to the uniform dispersion of cellulose nanocrystals modified by the zinc complex obtained in step (1), stirred at room temperature for 1 h, and ultrasonically removed to obtain a uniform film-forming liquid. spare;

[0028] (3) pour the film-forming solution obtained in step (2) into a flat-bottomed glass dish, and dry at room temperature for 24 hours to obtain a high-performance polylactic...

Embodiment 2

[0030] A high-performance polylactic acid nanocomposite material is composed of the following components by weight: 97 parts of polylactic acid, and 3 parts of cellulose nanocrystals modified by zinc complexes.

[0031] The preparation method comprises the steps of:

[0032] (1) Disperse 3 parts of cellulose nanocrystals modified by zinc complexes in 1500 parts of dichloromethane, sonicate for 3 hours at room temperature, and stir for 3 hours to obtain a uniform dispersion of cellulose nanocrystals modified by zinc complexes, which is set aside;

[0033] (2) 97 parts of polylactic acid are added to the uniform dispersion of cellulose nanocrystals modified by the zinc complex obtained in step (1), stirred at room temperature for 1 h, and ultrasonically removed to obtain a uniform film-forming liquid. spare;

[0034] (3) pour the film-forming solution obtained in step (2) into a flat-bottomed glass dish, and dry at room temperature for 24 hours to obtain a high-performance poly...

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Abstract

The invention discloses a high-performance polylactic acid nano composite material and a preparation method thereof, and the high-performance polylactic acid nano composite material is composed of thefollowing components in parts by weight: 93-99 parts of polylactic acid and 1-7 parts of zinc complex modified cellulose nanocrystalline. According to the invention, the cellulose nanocrystal modified by the zinc complex is used as a modifier, so that the performance of polylactic acid can be effectively improved. The polylactic acid nano composite material prepared by the invention has excellentultraviolet shielding property, antibacterial property, mechanical property, water vapor barrier property and fluorescence property, low hygroscopicity, low cytotoxicity and low hydrophilicity, and is simple in preparation process, easy in chemical component control, good in repeatability, and higher in yield; the polylactic acid composite material has potential application value in the fields ofpackaging materials, biomedical materials and the like, is suitable for large-scale production, and expands the application field of the polylactic acid composite material.

Description

technical field [0001] The invention belongs to the technical field of polylactic acid nanocomposite materials, and in particular relates to a high-performance polylactic acid nanocomposite material and a preparation method thereof. Background technique [0002] As the most abundant biomass resource on the earth, natural cellulose is a biological resource widely distributed in nature, and exists in various organisms such as plants and some other carriers. Cellulose nanocrystal is a nanoscale material extracted from natural fibers, because it has the excellent characteristics of both nanomaterials and cellulose, such as high mechanical strength, amphiphilicity, optical activity, and various surface modifications. It has received extensive attention from researchers in different fields. [0003] With the continuous improvement of people's quality of life, people pay more and more attention to the protection of the environment. Because the "white pollution" caused by traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/04C08J5/18
CPCC08J5/18C08J2367/04C08J2401/04Y02W90/10
Inventor 邹志明武经纬程泽张焱张鸿懿蒋帅锋唐群梁福沛
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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