The role of gas-phase silica in polysulfide sealant
Gas-phase silica is the preferred material for polysulfide sealant. It is mainly coated with an organic material on the surface of gas-phase silica to make it hydrophobic. When added to the sealant, it quickly forms a silica structure, where nano-sized SiOx particles form a network structure that inhibits the flow of the colloid, accelerates the curing speed, and improves the bonding effect. The small particle size of gas-phase silica also increases the sealing and anti-leakage properties of the product.
How much gas-phase silica should be added to polysulfide sealant?
Carbon black is an effective reinforcing agent for sealants. After adding carbon black, the tensile strength and elongation at break of the sealant are significantly increased. However, many people do not know how much gas-phase silica is ideal to add to polysulfide sealant. In fact, the specific amount of gas-phase silica added to polysulfide sealant needs to be determined based on experimental results. Here is a reference ratio of 5 parts of gas-phase silica added to 100 parts of base material, which means the ratio of polysulfide sealant to gas-phase silica is 100:5.
The effect of gas-phase silica on polysulfide sealant
Gas-phase silica not only affects the tensile strength and elongation at break of polysulfide sealant but also has a certain impact on other properties of polysulfide sealant, such as good heat resistance and strong oxidation resistance when gas-phase silica is added to the polysulfide sealant.