Expanding the performance and related knowledge of the cover paint for motors
Cover paint is divided into enamel and varnish. The enamel contains filler or pigment, but the varnish does not. Cover paint is used to coat impregnated electric coils, insulation and metal structural parts to achieve air insulation, prevent oxidative aging, improve corrosion resistance, moisture resistance and chemical resistance, improve thermal conductivity and improve equipment. Commodity value and other purposes.
The performance requirements for the cover paint are fast drying, strong adhesion, hard paint film, high mechanical strength, moisture resistance, oil resistance and corrosion resistance. The hardness of the enamel paint film is larger than that of the paint-based varnish. The heat conduction, heat resistance and arc resistance are better, but other electrical properties are slightly worse, and it is mostly used for coil and metal surface coating. Varnish is mostly used for the inner surface coating of insulating parts and electrical equipment.
Type, model, characteristics and use of commonly used cover paint
J-813 polyurethane air drying paint: heat resistance grade E, fast drying, the film is tough and bright, and the performance is stable.
● 1231 alkyd drying cover paint: heat resistance grade B, heat resistance grade E grade, with good elasticity and high dielectric properties, used for electrical surface coverage.
● 9120 epoxy ester drying paint: heat resistance grade B, the film is bright, strong, weather resistant, used for motor and electrical surface coverage.
● 162 epoxy ester red enamel: heat resistance grade B, the film is hard, smooth, high strength, resistant to bacteria and has high dielectric properties, used for motor and electrical winding surface coverage.
● 163 epoxy ester ash enamel: heat resistance grade B, the same performance as 162, but contains anti-mold agent, used for tropical motor, electrical winding coverage.
● 164 epoxy ester ash enamel: heat resistance grade B, low drying temperature, other properties same as 163 type, used for wet tropical motor, electrical winding surface coverage.
● 165 polyester ash enamel: heat resistance grade F, the film is hard, smooth, strong adhesion, resistant to mineral oil, and has good moisture and mildew resistance, used for motor winding and electrical winding surface coverage.
● 166 polyester dry ash enamel: heat resistance grade F, the film is hard, smooth, resistant to mineral oil and good moisture resistance, used for motor stator winding and electrical winding surface coverage.
● 182 polyester dry brocade enamel: heat resistance grade F, good dielectric properties, oil resistance and elasticity, used for motor rotor winding and electrical winding surface coverage.
● 183 polyester dry iron red enamel: heat resistance grade F, with good dielectric properties, water resistance and elasticity, used for motor rotor winding and electrical winding surface coverage.
● 184 polyester drying lake blue enamel: heat resistance grade F, performance the same as 183 type, used for motor rotor winding surface coverage.
● 9129 epoxy solvent-free cover paint: heat resistance grade F, the paint film has higher hardness and better elasticity, and is used for surface coating of stator end of 600MW steam turbine generator.
● 185 silicone alkyd enamel: heat resistance grade H, good electrical and mechanical properties and tracking resistance, used to coat dry outdoor reactors.
● 169 polyester modified silicone red enamel: heat resistance grade H, has good adhesion, moisture resistance and elasticity, used for moisture-proof coating of motor windings and electrical parts.
● 9131 silicone enamel: heat resistance grade H, has good heat resistance, oil resistance, moisture resistance and electrical insulation properties. The film is not sticky after drying, and is used for surface coverage of H-class motors and electrical windings.
● 167 silicone drying red enamel: heat resistance grade H, with high elasticity, oil resistance and dielectric properties, used to modify the motor winding surface.
●197 high-purity polyester modified silicone paint: heat resistance grade H, low curing temperature, high mechanical strength, strong adhesion, dense paint film, low gas permeability, suitable for surface protection coating of high power semiconductor devices and thyristors .
Drying type cover paint characteristics and precautions
Dry-type cover paint does not need to be baked, but the performance is worse than that of the dry type. It is mainly used for surface coating of large electrical equipment or parts that are not suitable for baking. However, parts that are baked and suitable for baking should be selected as dry type. Cover the paint.
When using the cover paint, the viscosity and uniformity of the paint, the baking temperature and the cleanliness of the paint should be strictly controlled, otherwise the dryness and surface quality of the paint film will be affected. The enamel contains fillers or pigments, which are prone to precipitation, agglomeration, uneven viscosity and discoloration during storage. Stir well during the paint adjustment and before use. If the surface of the paint is crusted, it should be carefully removed or filtered to prevent the surface quality of the paint film from being mixed into the paint.
The cover paint can be applied by spraying, brushing, dip coating, etc., usually by multiple coating processes, typically twice.
