Chlorosulfonated polyethylene is abbreviated as CSP or CSPE or CSM. It is produced by chlorination and chlorosulfonation of low density polyethylene or high density polyethylene. Presented as a white or yellow elastomer.
The main production methods and product uses of chlorosulfonated polyethylene (CSM) are described in this article.
There are two production methods for chlorosulfonated polyethylene, which are solvent method and gas-solid method.
The traditional solvent method is a liquid phase manufacturing process using chlorine gas, sulfur dioxide or the like as a chlorosulfonylating agent, and its main disadvantage is that the utilization rate of sulfur dioxide is low (20-30%), and the chlorine content of the product is only 25-45%. Sulfur containing 0.8-1.7%, the fatal shortcoming is the use of carbon tetrachloride as a solvent. In addition, the post-treatment process of the liquid phase process is cumbersome (except for acid gas, CSM agglomeration and separation operations, etc.).
Gas phase method: The synthesis process was reported as early as the 1980s, but the earliest industrialized equipment was put into use in 2009. This process was organized and developed by Chinese companies. In the same year, the products were successfully trial-produced. In May 2010, gas The production process of solid chlorosulfonated polyethylene has passed the scientific and technological achievements appraisal organized by the China Petroleum and Chemical Industry Federation. The biggest breakthrough in the gas-solid process is that the organic solvent is not used at all, and the material of the reaction gas is directly contacted, which shortens the process and achieves green environmental protection.
Product use of chlorosulfonated polyethylene
CSM has been widely used in wire and cable, waterproof coiled materials, automotive industry and other fields, and has become a commonly used special rubber. Anti-corrosion coatings prepared from CSM-based materials are used in a wide variety of applications.
CSM is widely used in the automotive industry, and CSM has a huge potential for consumption in the automotive industry.
CSM is used industrially to manufacture products such as pipes, conveyor belts, seals, etc. with special properties. For example, a laminated tube made of CSM as an inner layer has low permeability to a fluorohydrocarbon refrigerant and is suitable for a refrigerant delivery pipe. When a CSM-fluororubber laminated tube is produced, such as the addition of a peroxide, the peel strength of the laminate can be greatly improved, and the laminate is suitable for the manufacture of tubes and containers for transporting and storing fuel oil.
CSM can be blended with other rubbers. The blend of CSM and fluororubber improves the processing properties of the blended compound. The blend of CSM and ethylene propylene rubber improves the physical and mechanical properties and thermophysical properties of the vulcanizate. The addition of CSM and isoprene in the EVA polymer can produce slip, abrasion and oil resistance. CSM is blended with PVC and PU in an extruder and vulcanized to produce an oil-resistant and ozone-resistant vulcanizate.
The above is the production method and product use of chlorosulfonated polyethylene (CSM). If you have any ideas, please let us know.