Chlorinated rubber is chlorinated natural rubber or synthetic polyisoprene rubber in chloroform or carbon tetrachloride at 80,.._, l00 °C. The final product is a polymer of random ring structure with a chlorine content of about 65%.
The chlorinated rubber paint film is dense and brittle, and chlorinated paraffin is often added as a plasticizer. The water vapor and oxygen transmission rate of the paint film is extremely low, only 1/10 of that of alkyd resin, so it has good water resistance and antirust performance. Chlorinated rubber is chemically inert, so it has excellent acid and alkali resistance, and can be used on alkaline substrates such as concrete.
Chlorinated rubber paint has good adhesion, it can be dissolved by its own solvent, so the adhesion between the coating and the coating is very good, even after one or two years, the coating is still very good for recoating , can be applied at low temperature, and has flame retardancy. Chlorinated rubber paint dries quickly and is easy to construct. At 23°C, it can be recoated with primer after 2 hours.
Chlorinated rubber coatings are widely used in anti-corrosion coatings in modern heavy industry, the main varieties are chlorinated rubber iron red anti-rust paint, chlorinated rubber aluminum powder anti-rust paint, chlorinated rubber mica iron anti-rust paint and chlorinated rubber surface (chlorinated rubber topcoat has recently been replaced by acrylic topcoat), which can be used in various atmospheric environments and underwater environments, such as chemical plants, bridges, construction machinery, iron towers, port facilities, ships and containers. In the shipbuilding and container manufacturing industries with the largest application of anti-corrosion coatings, chlorinated rubber coatings once occupied the main position and became the standard supporting scheme. In Europe, more than 60% of chlorinated rubber was used in the production of marine coatings.
