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
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[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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