Explanation

A general term for special synthetic rubber with sulfur atoms in the main chain. It is usually condensed from organic dihalides and alkali metal polysulfides. There are two types of solid and liquid polysulfide rubber, of which the output of liquid rubber accounts for more than 80% of the total. Most of them are condensation polymers of formaldehyde and sodium tetrasulfide. The introduction of oxygen atoms improved the low-temperature elasticity of rubber. The most prominent feature of polysulfide rubber is solvent resistance, especially non-polar solvent. The more sulfur content in polymer, the better solvent resistance. polysulfide rubber has excellent UV resistance, moisture resistance and low vapor permeability to various solvents. Water tightness, air tightness, and ozone resistance are all outstanding. polysulfide rubber can be synthesized by condensation reaction of organochlorine monomer (C1RC1) and sodium polysulfide. The molecular weight of liquid polysulfide rubber is more than thousands. Liquid polysulfide rubber is mainly used as oil resistant sealing material. It has good adhesion to aluminum alloy and is used in aircraft, shipbuilding, trains, building materials and highway construction. Solid polysulfide rubber is also used in large oil tank lining, oil resistant hose, aircraft oil tank lining and other places.

Classification