PF/EP/Nano-SiO₂ composite paint for resistor

Abstract

Phenolic resin(PF) and nano-SiO₂ were used to improve the curing property and high humidity resistance of epoxy resin (EP) and methyl nadic anhydride (MNA) resistor paint, respectively. Hydrogen bonds, formed between phenolic resin and nano-SiO₂ in alcohol, made nano-SiO₂ disperse easily in EP/MNA paint through phenolic resin without being treated by supersonic vibration. When the mass ratio of PF to EP in paint is 3:7, the formed composite paint film can be cured in 2 min at 170 °C. When the mass ratio of nano-SiO₂ to PF in paint is 3:100, the property of high humidity resistance of the composite paint is the best, meeting the requirement of varying ratio of resistance less than 0.1% after experiment on high humidity resistance. SEM analysis shows the surface of the composite paint film is smooth, glassy, tight and homogeneous, without acicular air holes.

Keywords

phenolic resin / epoxy resin / nano-SiO₂ / paint for metal film resistor / curing time / high humidity resistance

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