What Is A Rigid Pu Catalyst

rigid pu catalyst can increase the rate of chemical reaction, but itself is not consumed and does not change in the reaction. The composition of the catalyst varies with the type of chemical reaction. Catalysts can catalyze many crosslinked film forming reactions, for example, catalysts catalyze amine resin systems, polyurethane systems and epoxy resin systems. It can be used as a catalyst in some coating systems, and some other systems can be used with some typical Lewis acid metal catalysts and Lewis base quaternary ammonium salts catalysts. Acid catalysts can be used to catalyze the reaction between coach resin and matrix resin. If the crosslinking is good, the performance of the film obtained by the final crosslinking will be greatly improved. Through crosslinking, the molecular weight of the resin is improved, and the chemical resistance, humidity resistance, washing resistance, corrosion resistance of the paint film is improved, while improving the flexibility and hardness of the paint film. The coating formulation engineer must consider the cross-linking agent, curing temperature and time, the ph of the system, and the properties of the coating when selecting the catalyst for the system, and must follow the technical guidance provided by the raw material supplier. Butyltin dilaurate and dibutyltin diacetate are typical catalysts for isocyanate and hydroxyl curing in polyurethane coating systems. Some non-tin compounds such as bismuth, aluminum, and zirconium can also be used as catalysts to catalyze such reactions. Non-tin catalysts are more environmentally friendly than organotin catalysts and have the following advantages: faster curing rate, longer gelation time, increased catalytic efficiency in electrophoretic coating systems, and reduced hydrolysis of polyester resins. If the coating system contains water, the acid value of the resin is high and the pigment contains water easily deactivate the catalyst.