Method for preparing nano powder with strong ultraviolet absorption function

Abstract

The invention provides a method for preparing nano powder with a strong ultraviolet absorption function. The method comprises the following steps: mechanically pulverizing metal oxides, and carrying out ultrasonic high-speed atomization; carrying out airflow pulverization and surface modification, thus finally obtaining a product. The zinc oxide, the cadmium oxide, the titanium dioxide and the tin dioxide used by the method for preparing the nano powder with the strong ultraviolet adsorption function have a good ultraviolet shielding function, also has the advantages of no stimulation to skin, no decomposition, no degeneration, and good thermal stability, and can be widely used in cosmetics, plastics, textiles and other industries.

Description

technical field

[0001] The invention belongs to the technical field of functional nano powder preparation, and in particular relates to a preparation method of functional nano powder which strongly absorbs ultraviolet light. Background technique

[0002] Ultraviolet rays can be divided into short-wave (UVC, 200-280nm), medium-wave (UVB, 280-320nm), and long-wave (UVA, 320-400nm) according to wavelength. Ultraviolet UVC is absorbed by ozone, and the harm of ultraviolet rays to humans is generally caused by the combined effect of UVA and UVB.

[0003] Nanoscale metal oxide powder less than 200nm has good UV shielding function. The quantum size effect of nano powder makes it have a "blue shift phenomenon" in the absorption of certain wavelengths of light and a "broadening phenomenon" in the absorption of various wavelengths, so the absorption of ultraviolet rays is significantly enhanced. Therefore, as a functional material for absorbing ultraviolet rays, nanomaterials are us...

Examples

Embodiment 1

[0038] Weigh 3 tons of zinc oxide coarse powder, add it to a mechanical pulverizer with a speed of 350rpm, and pulverize it for 45 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 250W, and the high-speed atomization speed is 24000rpm. Easy to weigh; weigh 0.15t of surface modifier mercaptoacetic acid according to the ratio of 5wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 100°C, the concentration of the modifier solution is 5wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, zinc oxide nanopowders with an average diameter of 100 nanometers, which have been surface-modified and uniformly dispersed are obtained.

[0039] This is sample 1.

Embodiment 2

[0041] Weigh 3t of titanium dioxide coarse powder, add it to a mechanical pulverizer with a speed of 300rpm, and pulverize it for 60 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 200W, and the high-speed atomization speed is 22000rpm. Weighing; weigh 0.24t of amino acid surface modifier according to 8wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 110°C, the concentration of the modifier solution is 6wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, titanium dioxide powder with an average diameter of 100 nanometers, which has been surface-modified and uniformly dispersed is obtained.

[0042] This is sample 2.

Embodiment 3

[0044] Weigh 3 tons of cadmium oxide coarse powder, add it to a mechanical pulverizer with a speed of 250rpm, and pulverize it for 45 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 250W, and the high-speed atomization speed is 20000rpm. Easy to weigh; weigh 0.18t of glycerol according to the ratio of 6wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 100°C, the concentration of the modifier solution is 4wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, titanium dioxide powder with an average diameter of 120 nanometers, which has been surface-modified and uniformly dispersed is obtained.

[0045] This is sample 3.

technical field

[0001] The invention belongs to the technical field of functional nano powder preparation, and in particular relates to a preparation method of functional nano powder which strongly absorbs ultraviolet light. Background technique

[0002] Ultraviolet rays can be divided into short-wave (UVC, 200-280nm), medium-wave (UVB, 280-320nm), and long-wave (UVA, 320-400nm) according to wavelength. Ultraviolet UVC is absorbed by ozone, and the harm of ultraviolet rays to humans is generally caused by the combined effect of UVA and UVB.

[0003] Nanoscale metal oxide powder less than 200nm has good UV shielding function. The quantum size effect of nano powder makes it have a "blue shift phenomenon" in the absorption of certain wavelengths of light and a "broadening phenomenon" in the absorption of various wavelengths, so the absorption of ultraviolet rays is significantly enhanced. Therefore, as a functional material for absorbing ultraviolet rays, nanomaterials are us...

Examples

Embodiment 1

[0038] Weigh 3 tons of zinc oxide coarse powder, add it to a mechanical pulverizer with a speed of 350rpm, and pulverize it for 45 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 250W, and the high-speed atomization speed is 24000rpm. Easy to weigh; weigh 0.15t of surface modifier mercaptoacetic acid according to the ratio of 5wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 100°C, the concentration of the modifier solution is 5wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, zinc oxide nanopowders with an average diameter of 100 nanometers, which have been surface-modified and uniformly dispersed are obtained.

[0039] This is sample 1.

Embodiment 2

[0041] Weigh 3t of titanium dioxide coarse powder, add it to a mechanical pulverizer with a speed of 300rpm, and pulverize it for 60 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 200W, and the high-speed atomization speed is 22000rpm. Weighing; weigh 0.24t of amino acid surface modifier according to 8wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 110°C, the concentration of the modifier solution is 6wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, titanium dioxide powder with an average diameter of 100 nanometers, which has been surface-modified and uniformly dispersed is obtained.

[0042] This is sample 2.

Embodiment 3

[0044] Weigh 3 tons of cadmium oxide coarse powder, add it to a mechanical pulverizer with a speed of 250rpm, and pulverize it for 45 minutes, and at the same time use ultrasonic high-speed atomization to assist pulverization. The ultrasonic power is 250W, and the high-speed atomization speed is 20000rpm. Easy to weigh; weigh 0.18t of glycerol according to the ratio of 6wt.%, adjust the airflow pulverizer, and the gas flow rate is 3m 3 / min, the gas pressure is 0.6MPa, the air temperature is 100°C, the concentration of the modifier solution is 4wt.%, the flow rate of the modifier solution is 1ml / min, the atomization is 1-20μm, spray the modifier after the crushing, and crush After completion, titanium dioxide powder with an average diameter of 120 nanometers, which has been surface-modified and uniformly dispersed is obtained.

[0045] This is sample 3.

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