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UV coating technology for mobile phone UV coating

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Source of information: Date of this site: 2015-05-06

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An important selling point of mobile phones is the UV coating in the manufacturer's publicity. What exactly is a UV coating? I see that most players do n’t know much about that, except that it seems bling, and there are many questions. Why does the UV coating still wear and fall off? Today, we come to popularize some basic knowledge about UV: Ultraviolet-curing (UV) coatings are coatings that use three-dimensional ultraviolet rays to produce chemical action and overlap to make three-dimensional bridge-hardening coatings. Ultraviolet radiation curing technology is a brand-new green technology developed since the 1970s. The UV-curable resin coating produced by this technology, referred to as UV coating, has no volatile organic compounds (VOC) and pollutes the environment Small, fast curing speed, energy saving, good performance of cured products, suitable for high-speed automated production and other outstanding advantages. The latest information shows that countries such as Europe and the United States have passed legislation to restrict the use of traditional coatings with high VOC emissions, and gradually replace traditional coatings with environmentally friendly new materials such as UV coatings. UV coating production in the United States, Germany, Italy and other developed countries accounts for about 10% of total coating production, and is increasing at an annual rate of 15%. According to the prediction of German Hess, by 2010, the output of UV-curable coatings worldwide will reach more than 50% of the total output of the entire coatings industry, and UV environmental protection new materials will maintain their advantages for 30 years. UV-curing coatings have superior characteristics than traditional heat-drying coatings. For UV coating, the spray liquid is UV oil, which is cured by UV lamp (ultraviolet lamp) irradiation. It has the following four characteristics:

1. Strong adhesion. 2. Good gloss. 3. Does not fade. 4. Sterilization. General characteristics of UV coatings:

1. Hardening speed is very fast, hardening time is in seconds

2. Low temperature hardening, no direct heat required, and heat sensitive materials may be painted

3. Excellent coating film performance and hardening characteristics, suitable for high hardness or high interference

4. Solid content can reach 100%. Due to its high solid content, it is possible to obtain a thick coating film UV coating composition in only one application.

1. coincident double-bonded prepolymer

2. coincident monomer

3. Photoregistration starter

4. Additives

5. Solvent (N-butanone, toluene, ethyl acetate) processing technology


Pretreatment → Primer painting → Arrangement → UV irradiation → Vacuum plating → (Automatic coating line) Topcoat painting → Arrangement → UV irradiation → Products. After reading the above introduction, everyone has a certain understanding of how this shiny shell is made and why it is shiny and does not leave fingerprints after use? The following answer is why the paint is still falling off (in fact, even if it is a piece of iron, there will be traces when it is rubbed, let alone just a layer of paint?)


The hardening of UV coatings can not be judged from the appearance, and the vacuum plating products are composed of multiple layers of film. Therefore, when the coating film is not hardened, it will cause interlayer peeling and reduce the physical properties of the coating film. In addition, the outer shape of the mobile phone case is a frame, because the shape of the frame is of course a three-dimensional type, and it is difficult to harden the whole under the same conditions. Therefore, under the arrangement of the far-red outer heater and the UV lamp, considering the shape of the frame, there will be partial hardening. For the protection of the electroplated layer, there will be colored paint, so it is possible to design a paint with rich variations. Surface oil ratio. There are requirements for the physical properties of the engineering and products after painting, and it is even more necessary to choose a special coating. The film thickness is about 7 to 15 μ. This situation, coupled with wear and tear (especially the small button under the antenna and the two points where the flip is in contact with the fuselage is the most!) It is not difficult to understand why there is a paint drop? UV is now widely used. In mobile phones, it seems that Siemens 6688 and later models have applied this technology. Other aspects, such as cosmetics, containers, packaging accessories, auto mirrors, decorative objects, clocks, housings, high-grade metal products, plastic flooring and furniture, etc. can all apply this advanced technology. The appearance is secondary. Its main advantage is environmental protection!

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