【 Building materials network 】Not Metallic materials The surface coating technology of products is a new technology that has developed rapidly in recent years. It mainly selects spraying materials and construction methods based on the nature and use of raw materials. In view of cost considerations, promote the use of domestic equipment, tools and raw materials to coat non-metallic materials and products and make their surface accuracy reach the domestic advanced level. A lot of tests must be carried out on the spraying materials, equipment, and process methods. To this end, researchers Acrylic acid polyurethane Special for two-component plastics coating A large number of process tests have been carried out in terms of spraying process and construction methods, and the varieties of the same type of coatings have been analyzed and compared with each other to find out the relevant laws and improve the technical documents of spraying process.
　　
1. Spraying materials
　　
Acrylic polyurethane Plastic coating Yes acrylic resin , isocyanate and hydroxyl resin filler , pigment auxiliary , toughening agent, etc. As the selected isocyanate is an aliphatic dicyanate, it has good stability, is not easy to disperse and yellowing under the action of ultraviolet light, and has better thermal stability and alkali resistance than the commonly used aromatic isocyanate. It is an ideal polyurethane coating with good weather resistance and chemical resistance curing agent 。 Acrylic resin is characterized by light color, good chemical stability, excellent outdoor weather resistance and heat resistance. After cross-linking with aliphatic polyisocyanate, its properties will be further developed and improved. The coating film is full, smooth and bright, with strong adhesion, high hardness, good abrasion resistance and impact strength, excellent chemical resistance, good light and color retention, and is mainly used for various types of epoxy Glass Steel pasted products, such as military product covers, covers, antennas and other outdoor products; Various plastic products such as mobile phone shell, computer shell panel Refrigerator Plastic trim door Handle, motorcycle windshield air conditioner Plastic parts and other decorations.
　　
2. Construction technical requirements
　　
2.1 W-100-102G high particle spray gun is used. This gun has excellent atomization, the use pressure is 0.24MPa, the energy saving original paint is about 30%, and the coating is uniform. The ordinary spray gun is easy to flow and hang, the atomization of paint is poor, and the waste of raw materials is large. The utilization rate of paint is only about 70%.
　　
2.2 For pre sprayed workpieces, different solvents shall be selected according to different substrates to remove oil stains, film removers and other impurities from the workpieces.
　　
2.3 The working environment shall be kept clean and free of dust, and must be equipped with ventilation system Construction shall be carried out in the spray booth.
　　
2.4 The compressed air used for spraying must be dry and free of oil and water, and be filtered by secondary or tertiary filtration.
　　
2.5 The operators shall receive technical training, and operate with certificates after mastering the spraying process.
　　
　 3. Construction technology
　　
3.1 Spraying materials
　　
Special acrylic polyurethane plastic paint (two-component), varnish, matte paint, semi gloss paint, bright paint and various color paints, and provide qualified products with national stereotypes according to user and design requirements; Special diluent, aluminum powder slurry or pearlescent color slurry for standby; Industrial alcohol, absorbent cotton, various types of sandpaper and other auxiliary materials; Self drying nitro putty or two component putty.