In recent years, the random discharge of Freon gas has caused the destruction of the ozone layer, thereby increasing the incidence of skin cancer. Therefore, the demand for the development of ultraviolet protective agents has become increasingly strong. Conventionally, a substance using an organic component has been used as an ultraviolet absorber, but there is a problem that, for example, in order to protect the skin from ultraviolet rays as much as possible, the amount of photo-induced cancer is increased after the addition amount is increased, and chemical allergy is generated.
Any titanium dioxide has a certain ability to absorb ultraviolet rays. Ultrafine titanium dioxide has a larger particle size (transparent) and is more active, so it has a stronger ability to absorb ultraviolet rays. In addition, such as achromatic power, hiding power, clear color tone, low abrasiveness and good dispersibility, it is determined that titanium dioxide is a widely used inorganic raw material in cosmetics. Different qualities of titanium dioxide can be selected depending on their function in cosmetics.
Titanium white for cosmetics
Utilizing the whiteness and opacity of titanium white, when titanium white is used as a white additive, it is mainly made of anatase titanium dioxide; but considering the hiding power and light fastness, rutile titanium white should be used as well.
Due to its high hiding power, Titanium Dioxide can be used in powder and foundation creams, and only a relatively small amount of titanium dioxide can cover the color of the skin. And because of the high opacity of titanium dioxide, it can be used to make skin cream, so that the ultraviolet component in the incident light can be shielded (scattered or absorbed) by titanium dioxide, thus protecting the skin from ultraviolet rays, and fat-loving. Titanium dioxide can also be used in lipsticks.
The high-purity titanium dioxide prepared by the direct hydrolysis method of TiCl4 has high purity and low impurity content, and is an ideal cosmetic raw material.
Ultrafine titanium dioxide
Ultra-fine titanium dioxide can absorb ultraviolet light (wavelength 200nm ~ 400nm) and absorb ultraviolet light, so it has strong ability to shield ultraviolet rays. It can be used as an excellent sunscreen agent for the manufacture of sunscreen cosmetics.
Since ultra-fine titanium dioxide is transparent, it can be used to make transparent skin creams. This cream has a delicate cream and a natural skin feel. It is very popular in Japan and other countries.
Photochromic titanium dioxide
Photochromism means that the color of a substance changes due to the irradiation of light, and when the irradiation is terminated, the substance returns to its original color.
The photochromic titanium dioxide is prepared by adding a trace amount of iron oxide to the anatase hydrated titanium white powder and calcining it in the atmosphere in the range of 750 to 885. This kind of titanium dioxide is used in foundation cream. This kind of cosmetics is applied to the skin. It is a color under the sunlight of outdoor sunlight. It returns to the interior and becomes another color, so that natural makeup can be obtained both indoors and outdoors. effect.
Titanium black
The carbon black used in black cosmetics now has the advantages of high blackness and strong tinting strength. However, it is a hydrophobic substance that is difficult to disperse in water. It is also reported to contain carcinogens such as 1,3-phenylpropanoid. Japan has begun to adopt a new black powder pigment, which is reduced to a low-temperature titanium oxide black pigment by using titanium dioxide. Low-priced titanium oxide and titanium oxynitride are collectively referred to as titanium black.
The high-purity titanium dioxide is used as a raw material, and reduction in ammonia gas can obtain a titanium oxynitride black pigment. Because the impurities are not harmful to the human body during the production process, the titanium black prepared by the method is safe and harmless, and is suitable for black pigments in cosmetics, such as eyebrow pencils and mascaras.
Skin tone titanium dioxide
Due to the extremely low tinting strength of titanium dioxide and the addition of a large amount of pigment, the paste-like cosmetics made of titanium dioxide are separated from the paste after being heated, which affects the performance of the cosmetic. The titanium dioxide is made into a skin color powder, and no additional pigment is needed in the production. The skin color titanium dioxide can be obtained by adding several trace metal oxides with high-purity titanium dioxide and calcining in the atmosphere at 800 to 1000.
Since the titanium dioxide itself has a skin color, the cosmetic manufacturer does not need to add additional pigments in the production, avoiding a lot of pigments to cause harm to the human body, and also avoids the pigmentation after the cosmetics are released for a long time. The raw material used for skin color titanium dioxide is high-purity titanium dioxide, which has a certain absorption capacity for ultraviolet rays and can be used as a sunscreen cosmetic raw material. A foundation cream prepared with skin color titanium dioxide, which masks the spots of the skin and provides natural skin.
As people’s lives increase, the demand for cosmetics will increase, and more cosmetic grade titanium dioxide will be consumed. In addition, with the improvement of people’s scientific knowledge level and self-protection awareness, people are increasingly demanding the formulation of relevant regulations to prevent the replacement of cosmetic grade titanium dioxide with ordinary titanium dioxide. In recent years, the United States and Japan have issued new cosmetic regulations, which require sun protection. Series cosmetics (creams, foundation creams, pressed powders, lipsticks, etc.) must use high-quality (food grade) special titanium dioxide powder, so the development of titanium dioxide for cosmetics is promising.