A kind of polyvinyl alcohol/starch nanocomposite material with ultraviolet shielding function and preparation method thereof
A technology of polyvinyl alcohol and starch nanometer, applied in the direction of sustainable manufacturing/processing, bio-packaging, sustainable packaging, etc., can solve the problem of limited compatibility between polyvinyl alcohol and starch, which restricts the application of polyvinyl alcohol/starch composite materials, Poor UV shielding performance and other problems, to achieve the effect of simple and environmentally friendly preparation process, excellent UV shielding performance, and excellent mechanical properties
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[0023] The preparation method of polydopamine nanoparticles comprises the following steps:
[0024] After mixing isopropanol with a Tris buffer solution with pH=8.5, stir at 25°C for 30 minutes to obtain a mixed solution; add dopamine hydrochloride to the above mixed solution, react in the dark for 24 hours; then centrifuge, freeze-dry, to obtain polydopamine nanoparticles;
[0025] The mass ratio of the dopamine hydrochloride, isopropanol, and Tris buffer solution is 0.1:30:100.
Embodiment 1
[0033] A polyvinyl alcohol / starch nanocomposite material with ultraviolet shielding function is composed of the following components in parts by weight: 80 parts of polyvinyl alcohol, 20 parts of starch, 5 parts of glycerol, and 0.5 parts of polydopamine nanoparticles.
[0034] The preparation method includes the following steps:
[0035] (1) adding 80 parts of polyvinyl alcohol to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a polyvinyl alcohol solution, for subsequent use;
[0036] (2) adding 20 parts of starch and 5 parts of glycerol to 600 parts of deionized water, stirring and dissolving at 85° C. to obtain a starch solution for subsequent use;
[0037] (3) disperse 0.5 parts of polydopamine nanoparticles in 100 parts of deionized water, and ultrasonicate for 1 h to obtain a polydopamine nanoparticle dispersion, which is for subsequent use;
[0038] (4) adding the starch solution obtained in step (2) and the polydopamine nanoparticle dispers...
Embodiment 2
[0040] A polyvinyl alcohol / starch nanocomposite material with ultraviolet shielding function is composed of the following components in parts by weight: 80 parts of polyvinyl alcohol, 20 parts of starch, 5 parts of glycerol, and 1 part of polydopamine nanoparticles.
[0041] The preparation method includes the following steps:
[0042] (1) adding 80 parts of polyvinyl alcohol to 600 parts of deionized water, stirring and dissolving at 85 ° C, to obtain a polyvinyl alcohol solution, for subsequent use;
[0043] (2) adding 20 parts of starch and 5 parts of glycerol to 600 parts of deionized water, stirring and dissolving at 85° C. to obtain a starch solution for subsequent use;
[0044] (3) 1 part of polydopamine nanoparticles is dispersed in 100 parts of deionized water, and ultrasonicated for 1h to obtain a polydopamine nanoparticle dispersion, which is for subsequent use;
[0045] (4) adding the starch solution obtained in step (2) and the polydopamine nanoparticle dispersio...
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