Preparation And Properties Research Of Carbon Nanotube Electrostatic Conduction Coating

Carbon nanotubes(CNTs) have a unique structure makes it excellent mechanical, electrical and thermal properties. CNTs have a large aspect ratio, huge surface area and high crystallinity. As a conductive medium, one-dimensional nanostructure of carbon nanotubes have a huge advantage. Currently conductive filler of electrostatic conduction coating is mainly metal, carbon-based materials and metal oxides. The disadvantages of these conductive filler are large addition and oil pollution. Corrosion resistance and adhesion of coating prepared with these filler are poor, using time of coating is also short. The coating’s corrosion resistance and electrical conductivity cannot hold a good balance. CNTs electrostatic conduction coating was prepared by CNTs added to the epoxy-modified silicone prepolymer. The conduction coating possessed excellent mechanical properties, electrical properties and corrosion resistance. It’s also a new, economic and practical electrostatic conduction coating.Under conditions of heating and catalyst, phenyltriethoxysilane,diethyldiethoxysilane and tetraethoxysilane were used to synthesize silicone prepolymer. By orthogonal and IR test, the reaction conditions of the experimental results we got was as follows: R/Si molar ratio of 1.2, Ph/R molar ratio of 0.2, the reaction time 4h, the reaction temperature 65℃, hydrochloric acid as the catalyst.With butyl titanate as catalyst and E-20 epoxy copolymer modified silicone prepolymer, a modified resin was prepared. Copolymerization conditions and mechanical properties of the modified resin coating were researched by the test of IR, mechanical properties and the epoxy value. The results showed that modified resin’s mechanical properties of the coating film was improved compared with silicone prepolymer resin; The copolymerization reaction conditions were as follows: reaction temperature 160℃, the reaction time 4h.The catalyst was butyl titanate and the dosage was 0.5%.The flexibility, adhesion and impact strength were good when silicone prepolymer/epoxy mass at 40:60.Adding carbon nanotubes, dispersants, corrosion fillers and related additives to the modified resin, carbon nanotube electrostatic conduction coating was prepared. The impact of addition of carbon nanotubes, curing agent, coating thickness and anti-corrosion additive for electrostatic conduction coating was studied. Corrosion performance of electrostatic conduction coating was also made a preliminary study. Dispersants affect the dispersion properties of carbon nanotubes had been the focus of discussion. Experimental conditions were confirmed: The diameter of the carbon nanotubes choosed was 15~25nm.CNTs addition was 2%, the addition of curing agent polyamide 650 was 30%, the coating thickness was 120μm, composite dispersant was 1% octadecanol and 2% Disponer 983, composite corrosion filler was 10% aluminum tripolyphosphate and 10% zinc phosphate, the surface resistivity of coating was 5×107?,mechanical properties, electrical properties and anti-corrosion performance of coating were excellent. By acidification, removed the metal catalyst, oxides and carbon impurities could be removed from carbon nanotubes; By adding CNTs treated, the surface resistivity not only reduced two orders of magnitude, and the mechanical properties also improved.