Application of nano titanium dioxide (VK-T02) in cosmetics
Ultraviolet light is a kind of light wave that is harmful to the human body in sunlight. Excessive exposure to ultraviolet light can cause erythema and dark spots on the skin, causing the skin to age and severely causing skin cancer. In recent years, with the improvement of people's awareness of ultraviolet light and the awareness of health care, the development and application of sunscreen cosmetics has gradually become a research hotspot. Nano-titanium dioxide (VK-T02) has been used as a major sunscreen because of its high refractive index and high photoactivity. Nano-titanium dioxide (VK-T02) has been widely used for its superior performance and has been used in the research and development of new and high-quality sunscreen cosmetics, gradually showing its special advantages and broad application prospects.
1. The sun protection mechanism of nano titanium dioxide (VK-T02)
According to the wavelength, the ultraviolet light is divided into a short wave region of 190 to 280 nm, a medium wave region of 280 to 320 nm, and a long wavelength region of 320 to 400 nm. The short-wavelength region has the highest UV energy, but is blocked when it passes through the ozone layer. Therefore, the damage to the human body is generally the ultraviolet wave in the middle wave region and the long-wave region.
The strong UV resistance of nano titanium dioxide (VK-T02) is due to its high refractive index and high photoactivity. Its UV resistance and its mechanism are related to its particle size: when the particle size is large, the UV blocking is mainly caused by reflection and scattering, and is effective for both the medium wave region and the long wavelength region. The sun protection mechanism is simple covering, which is a general physical sun protection, and the sun protection ability is weak. With the decrease of the particle size, the light can pass through the particle surface of the nano titanium dioxide (VK-T02), and the reflection and scattering of the ultraviolet light in the long wavelength region. Not obvious, but the absorption of ultraviolet light in the middle wave area is significantly enhanced. Its sun protection mechanism is to absorb ultraviolet rays and mainly absorb ultraviolet rays in the middle wave region.
It can be seen that the nano-titanium dioxide (VK-T02) has different sun protection mechanisms for different wavelengths of ultraviolet light, and the ultraviolet light is blocked by the scattering in the long-wave region, and the ultraviolet light is blocked by the absorption in the middle wave region.
Due to its small particle size and high activity, nano-titanium dioxide (VK-T02) can reflect and scatter ultraviolet light and absorb ultraviolet light, thus providing a stronger barrier to ultraviolet light.
Nano titanium dioxide (VK-T02) is an inorganic component with excellent chemical stability, thermal stability and non-migration, strong achromatic power, hiding power, low corrosivity, good dispersibility, and It is non-toxic, tasteless, non-irritating, safe to use, and also has the function of sterilization and deodorization. More importantly, as mentioned above, nano-titanium dioxide (VK-T02) absorbs ultraviolet light and emits and scatters ultraviolet light, so it has strong UV resistance. Compared with the same dose of organic anti-UV agent, it is The absorption peak in the ultraviolet region is higher; and the nano-titanium dioxide (VK-T02) has a barrier effect on the ultraviolet wave in the middle wave region and the long-wave region, unlike the organic anti-ultraviolet agent, which only has a shielding effect on the ultraviolet light in the single mid-wave region or the long-wave region. In particular, due to its finer particles, the finished product has high transparency and can transmit visible light. When used in cosmetics, the skin whiteness is natural, which overcomes the opacity of some organic matter or pigment-grade titanium dioxide (VK-T02), making the skin unnatural. Disadvantages of pale
2, the choice of particle size
The size of nano-titanium dioxide (VK-T02) particles is closely related to its UV resistance. When the particle size is equal to or less than half of the wavelength of the light wave, the amount of reflection and scattering of light is the largest, and the shielding effect is the best. The wavelength of ultraviolet light is between 190 and 400 nm, so the particle size of nano-titanium dioxide (VK-T02) cannot be greater than 200 nm, preferably not more than 100 nm. However, it is not the smaller the particles, the better the particle size is too small to be agglomerated, which is not conducive to dispersion, and is also prone to block the pores of the skin, which is not conducive to the elimination of ventilation and sweat. Generally speaking, when the particle size is between 30 and 100 nm, the shielding effect on ultraviolet rays is best, and at the same time, the visible light is transmitted, so that the whiteness of the skin is more natural and beautiful. Therefore, it is preferable to try to control the size of the cosmetic titanium oxide (VK-T02) within this range.
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