Chemical industry: The difference between polyurethane sealant and polysulfide sealant

Polysulfide sealant is a sealant synthesized by reacting liquid polysulfide rubber as the main body with auxiliary agents such as vulcanizing agents, accelerators and reinforcing agents. . Polysulfide sealants are also divided into single and double components, with little difference in performance. They have excellent properties such as oil resistance and weather resistance, and have good bonding effects with most materials. They are widely used in metal and glass. Sealing, concrete caulking of pools, dams, bridges, tunnels, etc.

Universal polyurethane sealant Universal two-component polyurethane sealant is made of polyethylene adipate as raw material and solvent polyurethane resin as the main component ( (Component A), a two-component polyurethane sealant using trimethylolpropane-T1)I adduct as the curing agent (Component B). Universal two-component polyurethane sealant is also called 101-polyurethane sealant. Universal two-component polyurethane sealant is mainly used for bonding insulation materials, packaging materials, composite films, porous materials, cryogenic protection materials, etc.

Two-component polysulfide sealant

So what is the difference between polysulfide sealant and polyurethane sealant?

1. The stretchability and toughness of polyurethane sealant are stronger than those of polysulfide sealant. The elongation at break of polyurethane sealant can reach about 900%, while Polysulfide sealant can only reach a maximum of %. Therefore, polyurethane sealant must have a better construction effect when used for caulking expansion joints and deformation joints.

2. Polysulfide sealant has a wider range of use than polyurethane sealant, and its application is more extensive. It is used on some special materials such as glass and plastic. The adhesion of polyurethane sealant is due to polyurethane sealant, but polysulfide sealant cannot be mixed with silicone glue, which will greatly reduce the adhesion of polysulfide sealant.

3. Polysulfide sealant will release sulfide gas before and after curing. This gas not only contains odor, but also pollutes the environment to a certain extent. It can also be harmful to people if it is inhaled for a long time. In good health. Finally, polyurethane sealants take less time to tack dry and fully cure than polysulfide sealants, making them a better choice for rush-hour construction projects.