【 Building materials network 】Chen Yaocai (Nanbao Resin (China) Co., Ltd., Kunshan 215334)
　　
An Zhenji (SpringChem. Co., Korea)
　　
Abstract: The characteristics of plastic materials, appearance defects and coating repair of plastic parts for laptop computers coating And its spraying operation process.
　　
shut key Words: laptop; Plastic parts; Plastic coating
　　
CLC No.: TQ639 Document ID No.: A Article No.: 1009-1696 (2010) 12-0015-05
　　
0 Introduction
　　
On April 1, 1974, after Intel Corporation released its microprocessor 8080 for personal users, personal computers gradually began to enter the office and home. With the unprecedented development and extensive application of Internet technology and multimedia technology, today, computers have completely changed our lives. The size of the computer has also changed from a small laboratory machine to the present desktop LCD computer, laptop computer and the popular, thin and small laptop, and the colors are also varied door In particular, laptops and small laptops, like clothing or cars, have different popular color patterns every year to attract consumers' attention.
　　
The shell of laptop (including small laptop) is mainly made of plastic and metal:
　　
　　（1） Plastics : Low cost, easy to manufacture, forming mainly depends on injection molding. The plastics used for laptops and small laptops are ABS 、ABS+ PC , PC, PP, NYLON, composite materials, etc.
　　
(2) Metal: mainly casting Magnesium aluminium alloy Aluminum alloy, non cast magnesium aluminum alloy plate, titanium alloy and a few parts use stainless steel.
　　
Use plastic substrate and Spray coating It is still the mainstream. This paper mainly introduces the coatings and coatings for plastic parts of laptop computers.
　　
　 1 Properties of plastic materials
　　
Common plastic material characteristics:
　　
　　ABS： Acrylic acid , butadiene and benzene ethylene Aggregated. The composition of general ABS resin: A is 25%~30%, B is 25%~30%, S is 50%~40%, and the specific gravity is 1.07~1.15. Its characteristics are as follows:
　　
Opaque and uneven; Low heat resistance and good processability; When heated, the deformation temperature is 60~120 ℃. Generally, deformation occurs when the temperature is above 90 ℃ for a long time; It has strong physical properties; Poor weather resistance, not resistant to ultraviolet rays, and the impact resistance of long-term exposure to sunlight is reduced; It will melt when encountering solvent, but has good acid resistance and alcohol resistance; Smell will be produced when burning; Good electrical performance; High surface gloss. ABS surface can be painted, printed, vacuum coated and painted, which is more suitable for 3C products.