Introduction to Nano Titanium Dioxide
The properties and structure of nano titanium dioxide
Titanium dioxide, also known as titanium dioxide, chemical formula TiO2, is a white pigment with excellent performance. Nano titanium dioxide is an important kind of inorganic functional materials, also known as nano titanium dioxide. Nano titanium dioxide is a fine particle titanium dioxide powder prepared by a special process. Compared with ordinary titanium dioxide, its chemical stability, thermal stability, dispersion, non-migration, hydrophile, weather resistance, antibacterial self-cleaning, UV protection and other characteristics are more excellent, and can be used in a wider range of applications. It has a strong alternative to ordinary titanium dioxide in high-end applications and special applications. With the development of nanotechnology, its application fields will be further expanded.
Nano titanium dioxide has excellent antibacterial self-cleaning function, with strong antibacterial ability, wide antibacterial spectrum, long antibacterial aging, non-toxic safety and other characteristics, can be used in the manufacture of antibacterial fibers, antibacterial antifouling coatings, antibacterial sanitary ceramics, antibacterial fluorescent lamps and other products; Nanometer titanium dioxide has excellent anti-ultraviolet performance, can absorb, reflect and scatter ultraviolet light through visible light, is a physical shielding type ultraviolet protection agent, because of its natural whiteness, can be used to produce sunscreen cosmetics, but also can manufacture light-resistant aging coatings, plastics, ink and other products; In addition, nano-titanium dioxide can also be used in environmental protection fields such as sewage treatment and gas purification, as well as self-cleaning glass production and solar cell manufacturing.
According to the crystal type, nano-titanium dioxide can be divided into rutile type nano-titanium dioxide and anatase type nano-titanium dioxide two kinds, of which rutile type nano-titanium dioxide production technical barriers are higher. Nano titanium dioxide production technology mainly includes physical vapor deposition method (PVD), chemical vapor deposition method (CVD) two categories, of which chemical vapor deposition method can produce finer particle size, better performance of the product, but its equipment investment is relatively higher. There are two main industrial production methods: sulfuric acid process and chlorination process.
Apply
1. Cosmetics
Any titanium dioxide has a certain UV absorption function, and excellent chemical stability, thermal stability, non-toxicity and other properties. Ultrafine titanium dioxide due to smaller particle size (transparent), more active, so the ability to absorb ultraviolet light is stronger, in addition, such as achromic power, hiding power, clear tone, low abrasiveness and good dispersion, determines that titanium dioxide is the most widely used inorganic raw materials in cosmetics. The annual consumption of titanium dioxide in the cosmetics industry was estimated at 3500T-4000T in the 1980s, and is currently estimated at more than 5000t and less than 10000t. According to its different functions in cosmetics, different qualities of titanium dioxide can be selected.
The use of titanium white whiteness and opacity of these two properties, can make the color range of cosmetics is very wide, titanium white as a white additive, mainly with anatase titanium white, but considering the hiding power and fast light, or should be used rutile titanium white as a good.
The purity of titanium dioxide for cosmetics is high, and the content of harmful impurities is very strict. For example: The EC Food Additives Regulation (which applies to cosmetic products) states, Cosmetics use titanium white acid soluble content < 0.35%, As < 5 x 10-6, Pb < 20 x 10-6, Sb < 100 x 10-6, Cu < 100 x 10-6, Cr < 100 x 10-6, zinc < 50 x 10-6, BaSO4 < 5 x 10-6, (Sb+Cu+Cr+Zn+BaSO4)< 200×10-6,Hg can not be detected.
The U.S. Food and Drug Administration’s (FDA) Food, drug, and cosmetic regulations stipulate that the total amount of titanium dioxide used As a cosmetic, SiO4 and/or Ai2O3 as a dispersing agent, cannot exceed 2%, Pb<10×10-6, AS <1×10-6,Sb< 2×10-6,Hg< 1×10-6. In addition, after drying at 105℃ for 3h, the loss of burning at 800℃ is not more than 0.5%. The content of water soluble matter should not be greater than 0.3%, the content of titanium dioxide after 3h drying at 105℃ is not less than 99.0%, and the average particle size is less than 1μm.
Nano titanium dioxide is transparent, so it has many excellent properties and functions that general cosmetic raw materials do not have in terms of blocking ultraviolet light, passing through visible light and safety.
Nano titanium dioxide can not only scatter ultraviolet rays (wavelength 200nm-400nm), but also absorb ultraviolet rays, so its ability to shield ultraviolet rays is very strong, can be used as an excellent sunscreen, used in the manufacture of sunscreen series cosmetics.
Because nano titanium dioxide is transparent, it can be used to make transparent skin cream, this skin cream is delicate, with natural skin feeling, and is currently very popular in Japan and other countries, Japan every year as a sunscreen used as a raw material for cosmetics, it needs 1,000 tons of nano TiO2.
2. Antibacterial agents
At present, nano TiO2 has become one of the hotspots of development and research because of its excellent antibacterial properties. Nano TiO2 is widely used in antibacterial water treatment devices, food packaging, sanitary daily necessities (antibacterial floor tiles, antibacterial ceramic sanitation facilities, etc.), cosmetics, textiles, antibacterial tableware and cutting board, antibacterial carpet, new house decoration and new furniture in addition to harmful gases, construction of antibacterial mortar, antibacterial paint and antibacterial stainless steel plate, aluminum plate and other production of refrigerators, medical dressings and medicine Use durable consumer goods such as equipment.
Most antimicrobials are organic substances that are widely used in food, detergents, textiles and cosmetics. However, they have the disadvantages of poor heat resistance, volatile, easy decomposition and harmful substances, and poor safety. For this reason, people have actively developed and studied some inorganic antibacterial agents, and ultrafine TiO2 is one of them. Because antimicrobials need to reach a certain amount in the product, the selection of antimicrobials must follow the following principles:
1) It is safe and non-toxic to the human body and has no irritation to the skin;
2) Strong antibacterial ability and wide antibacterial range;
3) No odor, strange taste, the appearance of the color should be light, the smell should be small;
4) Good thermal stability, no discoloration at high temperature, no decomposition, no volatilization, no deterioration, etc.;
5) Cheap price, easy source, etc.
Ultrafine TiO2 is an inorganic component, non-toxic, tasteless, non-irritating, good thermal stability and heat resistance, does not burn, and itself is white, fully in line with the above principles.
Lei Titanium Chemical is a chemical technology enterprise specializing in the production of various high-quality chloride, rutile and anatase titanium dioxide. We have been focusing on the field of titanium dioxide for about 35 years and have rich experience in titanium dioxide production. If you are interested in our products, please feel free to contact us, we will provide you with the best service.
Post time: Nov-06-2023
