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Sunscreen powder and preparation method thereof

A powder and titanium dioxide technology, which is applied in the field of sunscreen powder and its preparation, can solve the problems affecting the sunscreen effect of sunscreen products

Pending Publication Date: 2019-03-01
林一中
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, nanoparticles will agglomerate during preparation, storage and use, which will affect their use in sunscreen products and their sunscreen effect, and concerns about the biological risks of nanoparticles are also rising

Method used

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  • Sunscreen powder and preparation method thereof
  • Sunscreen powder and preparation method thereof

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preparation example Construction

[0058] The preparation method of sunscreen powder of the present invention comprises the following steps:

[0059] (1) The base material is dispersed in the medium, and the titanium dioxide layer and the zinc oxide layer are coated sequentially under certain system pH and temperature conditions,

[0060] Wherein the substrate is flake-shaped, the particle size is less than or equal to 10 μm, and the aspect ratio is greater than or equal to 30, and

[0061] (2) The coated product obtained in step (1) is further coated with an inorganic photostable layer in a water dispersion system under certain system pH and temperature conditions, filtered and dried to obtain a sunscreen powder.

[0062] In a preferred embodiment of the present invention, the drying temperature of step (1) is 100-150°C, more preferably 120-125°C, and the time is 0.5-24h; the calcination temperature is 600-900°C, and the time is 10min-120min.

[0063] In a preferred embodiment of the present invention, the dr...

Embodiment 1

[0092] Take 60g of natural mica with a particle size of 2 o 3 2g in total), after adding, continue to stir at this temperature for 30min, then adjust the pH value of the system to 2.0, control the system under this pH condition, add titanium tetrachloride aqueous solution (calculated as 60g by titanium dioxide), after adding, it will be at 78 Continue to stir for 30 minutes under the condition of ℃, then adjust the pH value of the system to 8.5, control the system under the pH condition, add sodium silicate aqueous solution (calculated as silicon dioxide 2g), continue stirring for 30 minutes under the condition of 78 ℃ after the addition, and then Add 2g of octyltriethoxysilane, stir at 78°C for 30min after adding, filter, wash, dry, and calcinate at 800°C for 10min to obtain a loose powder without sintering; then redisperse the above powder into water, heat to 78°C, adjust the pH value of the system to 6.5, control the system by adding an aqueous solution of aluminum chloride...

Embodiment 2

[0098] Take 60g of synthetic mica mixture with a particle size of 2 0.5g in total), after adding, continue to stir at this temperature for 30min, then adjust the pH value of the system to 2.0, control the system by adding titanium tetrachloride aqueous solution (calculated as 80g as titanium dioxide) under this pH condition, and add it at 78 Continue to stir for 30 minutes under the condition of ℃, add 1 g of octyltriethoxysilane, stir for 1 hour, filter, dry, and calcinate at 780 degrees for 10 minutes to obtain a powder. Then redisperse the obtained powder in 700mL water, heat to 78°C, adjust the pH value of the system to 8.5, control the system by adding sodium silicate aqueous solution (calculated as silicon dioxide 3g) under this pH condition, and after the addition is completed, set the temperature at 78°C Continue to stir for 30 minutes under the conditions, adjust the pH value of the system to 6.5, control the system by adding an aqueous solution of aluminum chloride (c...

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Abstract

The invention relates to sunscreen powder and a preparation method thereof. The sunscreen powder sequentially comprises a substrate, an ultraviolet shielding layer and an optional inorganic light stabilizing layer from the inside to the outside. The substrate is in the form of a sheet, the particle size is less than or equal to 10 mum, and the radius-thickness ratio is more than or equal to 30. The ultraviolet shielding layer includes a titanium dioxide layer and a zinc oxide layer, and the rutile structure of the titanium oxide is not less than 60%. The sunscreen powder has the advantages ofgood dispersibility, good sunscreen effect and good stability.

Description

technical field [0001] The invention belongs to the field of powder, and in particular relates to a sunscreen powder and a preparation method thereof. Background technique [0002] Ultraviolet light is one of the shorter wavelengths in the sun's rays, and its energy only accounts for 5-6% of the total energy of the sun's rays, but it has a huge impact on human skin health. The ultraviolet rays that act on the skin are divided into UVC (200-290nm), UVB (290-320nm), and UVA (320-400nm). UVC can be absorbed by the ozone layer, it is difficult to reach the ground, and has no effect on the human body under normal circumstances; UVB has high energy, and being absorbed by the dermis of the skin will cause dermal blood vessels to dilate, showing symptoms such as redness, swelling, and blisters. Erythema, inflammation, skin aging, and severe skin cancer; the energy level of long-wave ultraviolet UVA is 1 / 1000 of the same dose of UVB, but the energy reaching the human body accounts f...

Claims

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Application Information

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IPC IPC(8): A61K8/29A61K8/25A61K8/27A61K8/02A61Q17/04
CPCA61Q17/04A61K8/0258A61K8/25A61K8/27A61K8/29A61K2800/413A61K2800/621
Inventor 林一中王振兴
Owner 林一中
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