With the fast-selling model of mobile phones, a large number of mobile phone accessories have also emerged, such as mobile phone cases, headphones, charging cables, and so on.
Today, I will explain the three common materials of silicone, TPU, and PC through various mobile phone cases. What are silicone, TPU, and PC? Processing molding, transparency, flexibility, and abrasion resistance. Will be shown later. Mobile phone cases with various functions and shapes ~
1, what is silicone, TPU, PC
Silicone
Silica gel is a highly active adsorption material, which is an amorphous substance. Its chemical molecular formula is mSiO2 · nH2O; it does not react with any substance except strong base and hydrofluoric acid. It is insoluble in water and any solvents, non-toxic and tasteless. Chemical Stable in nature.
Advantages: easy to use, dustproof, anti-fingerprint, easy to handle; moderate soft and hard, the silicone cover of the mobile phone will have a certain degree of softness to protect the phone next to it; there are many types of mobile phone silicone covers, with many different specifications of patterns, which can be used every day or Change the silicone cover of different mobile phones regularly to enrich your life. waterproof.
Disadvantages: In addition to protecting the mobile phone, the silicone cover of the mobile phone is relatively easy to soil. Due to the poor breathability of silicone, long-term use can easily lead to the accumulation of heat in the body of the mobile phone, which affects the use of the mobile phone.
2.TPU
A thermoplastic polyurethane elastomer rubber. It is mainly divided into polyester type and polyether type. It is widely used in daily necessities, sporting goods, toys, decorative materials and other fields. Halogen-free flame retardant TPU can also replace soft PVC to meet more and more environmental protection. Claim.
Advantages: wide hardness range, wear resistance, oil resistance, transparency, good elasticity,
Disadvantages: volatile, yellowish
3.PC
PC is an abbreviation of polycarbonate, referred to as PC engineering plastic. PC material is actually one of what we call engineering plastic. As a widely used material worldwide, PC has its own characteristics and advantages and disadvantages. PC is An amorphous thermoplastic resin with excellent comprehensive properties, you can see the shadow of PC plastic in every corner of your life, large-scale industrial production and easy processing characteristics also make it extremely cheap.
Advantages: excellent electrical insulation, extensibility, dimensional stability and chemical resistance, high strength, heat resistance and cold resistance, also has the advantages of self-extinguishing, flame retardant, non-toxic, can be colored, etc., the price is low .
Disadvantages: not resistant to scratches, strong acids, alkalis, UV rays
Second, transparency
Silicone
Silicone can not be completely transparent, the most transparent is a very hazy feeling like a thick fog.
2.TPU
Viewed from the outside, the TPU can be very transparent.
3.PC
High transparency. The PC material protective case also has good light transmittance. However, the production process of high transparency PC protective shell is relatively high, and translucent PC shell is still more common.
Third, processing molding
Silicone
The silicone molding process uses vulcanization. This process uses the temperature and pressure of an oil press to vulcanize the product by means of a mold.
Surface treatment:
Monochrome mobile phone cover, this type of mobile phone cover is only just to match the color of silicone, and match the shape of the mold to make a three-dimensional flat silicone mobile phone cover, which generally requires post-processing, such as: silk screen, color printing, digital printing, water transfer, thermal Transfer printing, radium carving, fuel injection, etc.
Epoxy mobile phone case is secondary formed by the process of dropping glue in silicone. After the mobile phone case is formed, it will have a color different from the original color of the phone. It is mostly used to highlight logos, trademarks, cartoon images and other colors. The bare-body mobile phone case, the single effect is really accompanied by a strong color contrast and impact, so the price is higher than the average bare-body mobile phone case.
2.TPU
TPU belongs to the plastic type. The product is made by injection molding process. After melting a grain of plastic rice, it is injected into a plastic mold with a barrel to make a product.
Surface treatment: electroplating, spraying, printing, etc.
3.PC
PC can be injection molded, extruded, molded, blow molded, thermoformed, printed, bonded, coated and machined. The most important processing method is injection molding.
Surface treatment:
Vacuum plating process: electroplating on the PC shell, engraving some patterns after plating, the texture is good, but after the vacuum plating, it needs to go to UV varnish.
PC spraying process: You can spray feel rubber oil, which feels like a lot of people. A little more complicated is spraying a layer of primer on colored (transparent red, transparent blue, transparent yellow, etc.) transparent PC shells, and then laser engraving some patterns. , Finally, a rubber paint, this product looks very high-end.
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