Polysulfide sealant Characteristics and Application of Technology

With China 's rapid economic and technological development of large-scale water conservancy project, the construction of high-rise buildings , aerospace engineering development and so need special properties of elastic adhesive sealant for joints , security seals sealing materials. According to reports , China's output of this sealant has reached 4 to 5 million tons, and formed a polysulfide , acrylic , silicone and polyurethane sealants as the main industries.
Polysulfide sealant is a polysulfide rubber (HS-(C2H4)-O-CH2-O-C2H4-SS) n-C2H4-O-CH2-O-C2H4-SH) -based agent , a plasticizer , reinforcing agents , curing agents made ​​of high-grade sealing materials. Because liquid polysulfide rubber polymer main chain containing "S" atom , forming -CS,-SS- chain and is saturated, which made the polysulfide sealant has excellent oil resistance , solvent resistance, aging , acid base properties, and heat, water , low permeability , good elasticity, for metal and nonmetal have a high bond strength. Mainly used for insulating glass sealing , high-rise building roof slab waterproofing and sealing subways, tunnels, sewage treatment plants, airport runways, large water conservancy waterproof seal joints . Therefore, there are broad application prospects.
Thiokol in 1929 successfully developed by the American company , in a solid state. Until 1943 improved synthesis process , made with a thiol end group of the liquid polysulfide rubber , have a rapid development. Since this polymer with various peroxides , oxide to cure at room temperature to form elastomers , thus expanding the range of its use .
Abroad in the 1960s polysulfide sealant in the automotive, shipbuilding , petrochemical and sealed waterproof construction work and other aspects are given a wide range of applications . Thiokol in our research work started late, until 1958 after the establishment of Jinxi Chemical Research Institute considered on track. Late 1970s early 1980s with the development of high-rise buildings , along with the rise of aluminum doors and windows was promoted polysulfide sealant waterproof seal in construction engineering applications .
The world production of liquid polysulfide rubber , the United States 20,000 tons / year, Germany 8000 tons / year, Japan 5,000 tons / year, Russia 3500 tons / year, Western Europe, about 2,000 tons / year. Chemical Research Institute of Jinxi only 500 tons / year scale devices can not meet the market demand, at present most of our imports from Japan , security seals the annual import volume of 1500 ... 1800 tons ; production of polysulfide sealant has reached more than 8,000 tons .