Nano-scale zinc oxide is better used in cosmetics. The details are as follows:
Ultraviolet rays in sunlight can be divided into UVA (320 mm ~ 400mm), UVB (290mm～320mm) and UVC (200mm～290mm). UVB is the main cause of burns, indirect pigmentation and skin cancer. Burns mainly manifest as erythema on the skin. In severe cases, they may also be accompanied by symptoms of edema, blisters, peeling, fever and nausea. Currently, the sun protection factor (SPF) in sunscreen cosmetics is designed to protect against UVB. Although most of UVC is absorbed by the ozone layer in the stratosphere of the atmosphere, due to its short wavelength, high energy and increasing damage to the ozone layer, the harm it causes to humans cannot be ignored. With the increasing intensity of global ultraviolet radiation and the development of skin science, the harm of UVA to the human body has gradually attracted people's attention. UVA has strong penetrating ability and is cumulative. Long-term action on the skin can cause photoaging phenomena such as reduced skin elasticity, rough skin, and increased wrinkles. UVA can also aggravate the damage caused by UVB. Nano zinc oxide (VK-JH01) can effectively shield UVA and has been widely used in sunscreen cosmetics in recent years.
Nano-ZnO (VK-JH01) added to sunscreen cosmetics may have the following characteristics: ① can provide effective protection in the full range of UVA and UVB; ② excellent dispersion and transparency; ③ safe and non-irritating ;④ Good light stability. However, in order to meet the above requirements, the original particle size and distribution of nano-ZnOV need to be strictly controlled, and special surface treatment of nano-ZnO is also required.
1 Product
Because nano zinc oxide (VK-JH01) has such special effects, many domestic and foreign manufacturers have developed nano zinc oxide (VK-JH01). Foreign manufacturers that provide nano-zinc oxide for cosmetics include Germany's BASF, Japan's Sakai Chemical and Japan's Imperial Chemical, Japan's Showa Denko and Japan's Sumitomo Cement and other companies. Domestic companies include Hangzhou Wanjing New Materials Co., Ltd.
Although there are many manufacturers of nano zinc oxide (VK-JH01), there are also fewer manufacturers that use it in cosmetics. Germany's BASF has launched such a product - Nanocrystalline Sunscreen (NuCelle Sun Sense SPF30 Sunscreen). Its main ingredient is Z-COTE, which was developed by BASF using nanotechnology. The basis is nanodispersed zinc oxide. Many sunscreen oils are thick, but the new Nano Sunscreen Oil is clear and translucent. It protects against a wider spectrum of sunlight (UVA and UVB) than traditional sunscreens and is non-allergenic.
Japan's Showa Denko Corporation (SDK) has also developed two ultra-fine ultraviolet shielding materials with the trade names Maxlight FTS and ZS, which can be used as base materials for sunscreen creams and other products. The company produces microparticles through a merged branch (now Showa Titanium Co., Ltd), among which the ZX series are ZnO particles with a diameter of 20nm. The company also coats the nanoparticles with a uniform thin layer of silica to reduce surface activity. Increase transparency and improve its UV shielding function. Maxlight ZS provides excellent UVA (wavelength 320~400nm) shielding function and high transparency. Due to the elution of zinc ions, the SDK has eliminated restrictions on the use of zinc-infused cosmetics. Domestic Hangzhou Wanjing New Materials Co., Ltd. has also developed nano zinc oxide (model: VK-JH01) for cosmetics according to the special requirements of cosmetics. The product has high purity and can provide effective protection against heavy metals in the full range of UVA and UVB. The content meets the index requirements of cosmetics.
In addition, these new products can produce oil/water-based cream sunscreen cosmetics (that is, they can contain emulsified oils in water).
If FTS and ZS are used together, the configured cosmetics can block ultraviolet rays of various wavelengths reaching the earth's surface.
2 Patents
After applying for a patent for the preparation of nano-zinc oxide, foreign companies used it in cosmetics and further applied for a patent. The U.S. patent US 6749838, authorized and announced by Japan's Shiseido Company, Ltd on June 15, 2004, introduces a method for manufacturing sunscreen cosmetics. It disperses zinc oxide particles in cosmetics. The zinc oxide particles have a diameter of 100nm or less, are coated with silicon compounds, and are dispersed in oil or water with high-temperature stirring.
The US patent US 20030161795 applied by ADVANCED POWDER TECHNOLOGY PTY LTD on December 20, 2002 also involves a formula process for sunscreen cosmetics. This clear sunscreen contains nano-sized UV-blocking particles such as zinc oxide. In its optimal formula, 10% titanium dioxide or physical UV protectant can be added for better results.
Domestic patents are all about the preparation method of nano zinc oxide (VK-JH01), but they also clearly state that the prepared particles can be used in cosmetics. For example, Chinese patent CN 1565977, published by the Institute of Process Engineering of the Chinese Academy of Sciences on January 19, 2005, involves a method for preparing nano-zinc oxide (VK-JH01). This method uses zinc acetate alcoholysis reaction to produce zinc oxide. The esterification reactions of acetate and ethanol are coupled to prepare nano zinc oxide powder. The nano-zinc oxide (VK-JH01) powder obtained by this method has bidispersion characteristics, can be water-dispersed and oil-dispersed at the same time, is white in color, and is easy to form a film, which solves the agglomeration problem of nano-zinc oxide powder; the entire reaction The process does not need to adjust the pH value, and the operation process and post-processing are simple; and the reaction solution can be recycled, which is expected to realize a zero-emission green process of nano zinc oxide (VK-JH01) production. The prepared nano zinc oxide (VK-JH01) can be used in electronic ceramics, cosmetics and other fields, and has broad application prospects.
The Chinese invention patent CN 1433966 disclosed by Dalian Sanke Technology Development Co., Ltd. on August 6, 2003 is based on the gas-solid phase reaction method, using zinc nitrate Zn(NO3)2 and sodium hydroxide NaOH. , as the main raw materials, grind and mix at room temperature, and thermally decompose to obtain a mixed solution. Add deionized water to wash, ethanol to wash, filter, and the filter cake is dried and calcined to obtain nano zinc oxide powder material. The invention has the beneficial effects of low energy consumption, simple equipment, no agglomeration phenomenon, no need for solvents, high yield, and controllable reaction conditions. The prepared nano zinc oxide materials can be used in products in fiber, glass, ceramics, cosmetics and other fields, which can greatly change the optical, electrical, magnetic and other properties of original products and expand the application scope of products in original fields.
3 Standards
For nano zinc oxide (VK-JH01), my country took the lead in formulating national standards and began to implement them in 2004. Its standard number is GB/T19589-2004. The standard divides products into three categories:
Category 1: Mainly used in medicine, cosmetics, and electrical materials;
Category 2: Mainly used in rubber, plastics, coatings, and ceramics , chemical fiber, catalyst;
Category 3: mainly used for rubber.
The indicators are reflected from two aspects:
1 Characterization of nano zinc oxide (VK-JH01) particle properties: particle size, specific surface area, agglomeration index;
2 Characterize the chemical composition of nano-zinc oxide (VK-JH01): zinc oxide contains mother, lead, manganese, copper, cadmium, mercury, arsenic, 105℃ volatile matter (), water-soluble matter, hydrochloric acid-insoluble matter, weight loss on ignition.
The test method uses transmission electron microscopy and XRD line broadening method to characterize the nanoparticle size, uses BET nitrogen adsorption method to measure the specific surface, and uses the laser scattering method to measure the average particle size and the XRD line broadening method. The ratio of the average grain size indicates the agglomeration index, and the chemical indicators adopt conventional and universal analysis methods.
Packaging, storage, and transportation are also based on the characteristics of nanomaterials.
(4) Market
In 2000, the global market for nano-zinc oxide (VK-JH01) was approximately US$4 million, but it is expected to reach US$90 million by 2007 , the annual growth rate is as high as 56, and will continue to grow, and is expected to reach 350 million US dollars by 2020. As one of the manufacturers of nano-zinc oxide, SDK Company predicts that the sales of its nano-series cosmetics are expected to reach 1 billion within 4 years.