Principles and techniques of plastic flame spraying Introduction

Plastic powder is produced by flame spraying gun is heated to a molten state flame sprayed onto the surface to form a spray coating technique. Flame spraying of plastic material used to improve the surface of the physical, chemical and mechanical properties, and both the surface of the decorative effect. Currently, the technology has been gradually used in product manufacturing, equipment maintenance, and other aspects of the preparation of anti-corrosion coating. With industries molybdenum plating needs and plastics plastics flame spraying technology development will be more widely applied flame. A plastic flame spraying principle for flame spraying plastics are thermoplastic and thermosetting plastics. Thermoplastic when heated, will vary with temperature and the softening and molten state, will harden after cooling. At the same time, the process is reversible. This feature of thermoplastic flame spraying is needed. Therefore, it is used mainly plastics flame spraying thermoplastic, which is the most widely used polyamide 1010, namely nylon 1010, as well as polyethylene, such as PE polyethylene. The common feature of thermoplastic low melting point, such as nylon melting point of 1010 degrees, the degree of melting point polyethylene; powder ignition temperature of from the melting point or decomposition temperature of the temperature difference is small. Therefore, the flame plastic coating must effectively control the flame temperature and the degree of heating of the plastic powder. To ensure that both the heating of the plastic particles in the molten state, is lower than the decomposition temperature of ignition or otherwise plastic powder will burn or deterioration. This is the key technology of plastic flame spraying. Solution to this problem is based on the original gas in the gas torch torch oxygen - acetylene flame add a layer outside air (referred to as mist or air curtain), a direct flame heating the air, and then let the air in the heating plastic powder, so can achieve the desired heating temperature of spraying, spraying complete. Degreasing the surface to be sprayed and spray the surface to be cleaned --- --- flame preheating sandblasting the surface to be sprayed --- sprayed plastic coating ---- reduce or eliminate the stress treatment --- Cooling cleaning (to be sprayed surface degreasing and cleaning should be considered part of the specific circumstances, generally divided into weight and sperm washing. sperm washing, commonly acetone). Spray the surface to be applied suction blasting shot blasting gun, air pressure 0.4 - 0.7MPa, as sharp sand corundum, particle size of 20 mesh. Sandblasting the surface to be sprayed should be carefully carried out until the surface was uniform to be sprayed silver white. Preheating purpose is to improve coating adhesion