An important selling point of mobile phones is the UV coating in the manufacturer's propaganda. What is the UV coating? I think most players don't know much about it except that it looks shiny, and there will be many questions. Why do uv coatings wear and tear? Today, I'm going to popularize some basic knowledge about UV: UV curable (UV) coating is a kind of coating that uses short wavelength ultraviolet radiation to produce chemical effects and overlap to make three-dimensional bridging and hardening. UV radiation curing technology is a new green technology developed in the world since the 1970s. The UV curing resin coating produced by this technology, referred to as UV coating, has outstanding advantages such as no volatile organic compounds (VOC), small environmental pollution, fast curing speed, energy saving, good performance of curing products, and suitable for high-speed automatic production. The latest data shows that European and American countries have passed legislation to limit the use of traditional coatings with high VOC emissions, and gradually replace traditional coatings with new environmental protection materials such as UV coatings. In the United States, Germany, Italy and other developed countries, the production of UV coatings accounts for about 10% of the total production of coatings, and increases by 15% every year. According to the prediction of German Hess Company, by 2010, the output of UV-curable coatings worldwide will reach more than 50% of the total output of the entire coating industry, and UV-curable coatings, a new environment-friendly material, will maintain its advantages in 30 years. Ultraviolet hardening coating has excellent characteristics than traditional heat-drying coating. The spray used for UV coating is UV oil, which is irradiated and solidified by UV lamp (UV lamp). It has the following four characteristics: 1. Strong adhesion. 2. Good gloss. 3. No fading. 4. Sterilization. General characteristics of UV coating: 1. The hardening speed is very fast, and the hardening time is in seconds 2. Low temperature hardening does not require heat directly, and heat-sensitive materials may also be coated 3. The coating film has excellent performance and hardening characteristics, and is applied to occasions with high hardness or high disturbability 4. The solid content can reach 100%. Due to the high solid content, only one coating can also obtain the components of thick and moist film UV coating 1. Prepolymer with coincidence double binding 2. Coincident monomer 3. Photocoincidence starter 4. Additives 5. Solvent (N-butanone, toluene, ethyl acetate) processing technology Pretreatment → primer coating → layout → UV irradiation → vacuum electroplating → (automatic coating line) finish coating → layout → UV irradiation → products. After reading the above introduction, do you have a certain understanding of how this shiny shell was made and why it glitters and does not leave fingerprints after use? The following answer is why the paint will fall off (in fact, even a piece of iron will have traces when it is used for grinding, let alone a layer of paint?) The hardening of UV coating can not be judged from the appearance, and vacuum electroplating products are composed of multilayer film. Therefore, when the film is not hardened, it will cause interlayer peeling and reduce the physical properties of the film. Moreover, the shape of the mobile phone shell is a box, because the shape of the box is a three-dimensional type of nature, it is very difficult to harden all under the same conditions. Therefore, under the arrangement of far infrared heater and UV lamp, considering the frame shape, there will be partial hardening deficiency. For the purpose of protecting the electroplating layer, there will be color paint, so it is possible to design paint with rich changes. Surface oil ratio. With the required physical properties of the project and products after coating, it is more necessary to select the coating. The film thickness is 7~15 μ Degree. It is not difficult to understand why there is paint peeling in this case, combined with wear and tear (especially the small button under the antenna and the two points where the flap contacts the fuselage!)? Now UV is widely used. In mobile phones, it seems that Siemens 6688 and later models of sx1 have applied this technology. Other aspects, such as cosmetics, containers, packaging accessories, car reflectors, decorations, clocks, shells, high-end metal products, plastic floors and furniture, can apply this advanced technology. Beautiful appearance is secondary. Its main advantage is environmental protection!