In the production of polyurethane soft foam sponge, the choice of silicone oil mainly depends on its viscosity and application scenario.
Viscosity selection of silicone oil
Low viscosity silicone oil: In the production of polyurethane soft foam sponge, low viscosity dimethyl silicone oil is usually used. This silicone oil has excellent lubricity, high temperature resistance and low toxicity. It can form a thin film on the surface of the sponge, which plays a role in lubrication and foaming prevention, while improving the wear resistance, high temperature resistance and waterproofness of the sponge.
High viscosity silicone oil: For process sponges and rubber sponges, it is more suitable to choose high viscosity silicone oil. This is because these sponges have larger internal pores, and high viscosity silicone oil can form a stable lubricating layer in the pores, improving the wear resistance and corrosion resistance of the sponge.
The role of silicone oil in the production of polyurethane soft foam sponge
Silicone oil plays an important role in the production of polyurethane soft foam sponge. It not only increases the service life of the sponge, but also improves the physical properties of the sponge. Silicone oil is added between the sponge material and the expander by applying, spraying or mixing, and is properly heated or compressed to fully penetrate the inside of the sponge. In addition, silicone oil needs to be used with other additives such as tougheners, fillers, defoamers, etc. to achieve better results.
Types and characteristics of silicone oil
Polyurethane silicone oil is a polymer compound copolymerized by polyurethane and siloxane, which has excellent performance and wide application. Its molecular structure contains active groups such as amino, hydroxyl, ether bond and siloxane, which can react chemically to give it excellent performance. Polyurethane silicone oil has good softness and elasticity, which can improve the comfort and performance of the material; at the same time, it has excellent weather resistance and chemical resistance, and can withstand the test of various environmental factors.