Effects of curing agents and silane coupling agents on the performance of silicone coatings

By controlling the content of curing agent and silane coupling agent in the silicone coating formula, their effects on the elastic modulus, hardness, hydrophobicity, water absorption and resistance to water medium immersion of the coating material were studied. The results show that when the curing agent content is greater than 4%, as the curing agent content increases, the elastic modulus of the coating decreases, the Shore hardness increases, and the water absorption rate increases; as the silane coupling agent content increases, the silicone coating The elastic modulus and water absorption increase, while the Shore hardness and water contact angle decrease. When the curing agent is added 6%, the elastic modulus of the coating is most sensitive to seawater immersion. The stability of the silicone coating containing 5% curing agent and 8% silane coupling agent in seawater is significantly reduced. Adding too much curing agent will increase the degree of cross-linking of the silicone chains, making the network structure denser, increasing the hardness of the coating, which is not conducive to the antifouling performance of the coating; adding too much silane coupling agent will cause The hydrophilic groups on the coating surface increase, the water contact angle decreases, and the adhesion of marine bacteria increases.