Cellulose acetate nano composite material with ultraviolet shielding function and preparation method thereof
A nano-composite material and cellulose acetate technology, applied in the field of cellulose acetate nano-composite materials and their preparation, can solve the problems of poor ultraviolet shielding performance, poor free radical scavenging activity and antioxidant activity, and poor water vapor barrier properties, and achieve excellent ultraviolet The effect of shielding performance, simple and environmentally friendly preparation process, and low hygroscopicity
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[0022] The dopamine-modified halloysite is self-made nanoparticles (average diameter is 40-80nm, and the average length is 200-1000nm), and the preparation method of dopamine-modified halloysite nanoparticles comprises the following steps:
[0023] Disperse the halloysite in deionized water, then sonicate for 1 hour, and stir for 1 hour to obtain a uniform dispersion; use tris(hydroxymethyl)aminomethane to adjust the pH value of the above dispersion to 8.5; then add dopamine hydrochloride to the above dispersion solution, and stirred for 6 hours in the dark, and finally, centrifuged and dried to obtain dopamine-modified halloysite;
[0024] The mass ratio of the deionized water, halloysite and dopamine hydrochloride is 100:1:0.2.
Embodiment 1
[0026] A cellulose acetate nanocomposite material with an ultraviolet shielding function is composed of the following components in parts by weight: 95 parts of cellulose acetate, 5 parts of abietic acid, and 1 part of dopamine-modified halloysite.
[0027] The preparation method comprises the steps of:
[0028] (1) 95 parts of cellulose acetate are added to 1500 parts of acetone, stirred and dissolved at 25° C. to obtain a cellulose acetate solution, and set aside;
[0029] (2) 5 parts of abietic acid are added to 250 parts of acetone, stirred and dissolved at 25° C. to obtain an abietic acid solution, which is set aside;
[0030] (3) Disperse 1 part of dopamine-modified halloysite in 250 parts of acetone, sonicate for 1 hour, and stir for 1 hour to obtain a dopamine-modified halloysite dispersion, which is set aside;
[0031] (4) Add the abietic acid solution obtained in step (2) and the dopamine-modified halloysite dispersion obtained in step (3) to the cellulose acetate s...
Embodiment 2
[0033] A cellulose acetate nanocomposite material with an ultraviolet shielding function is composed of the following components in parts by weight: 95 parts of cellulose acetate, 5 parts of abietic acid, and 3 parts of dopamine-modified halloysite.
[0034] The preparation method comprises the steps of:
[0035] (1) 95 parts of cellulose acetate are added to 1500 parts of acetone, stirred and dissolved at 25° C. to obtain a cellulose acetate solution, and set aside;
[0036] (2) 5 parts of abietic acid are added to 250 parts of acetone, stirred and dissolved at 25° C. to obtain an abietic acid solution, which is set aside;
[0037] (3) Disperse 3 parts of dopamine-modified halloysite in 250 parts of acetone, sonicate for 1 hour, and stir for 1 hour to obtain a dopamine-modified halloysite dispersion, which is set aside;
[0038] (4) Add the abietic acid solution obtained in step (2) and the dopamine-modified halloysite dispersion obtained in step (3) to the cellulose acetate...
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