Chlorosulfonated Polyethylene


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Chlorosulfonated Polyethylene

 

a synthetic rubber:

A product of the chemical modification of polyethylene by chlorine and sulfur dioxide, chlorosulfonated polyethylene has a density of 1.11–1.26 g/cm3, a chlorine content of 27–45 percent, and a sulfur content of 0.8–2.2 percent. Owing to the presence of chlorine, it is resistant to fire, oil, and the action of microorganisms and exhibits good adhesion to various surfaces. It is insoluble in aliphatic hydrocarbons and alcohols, slightly soluble in ketones and esters, and readily soluble in aromatic hydrocarbons, such as toluene and xylene, and in chlorinated hydrocarbons.

Chlorosulfonated polyethylene is superior to other rubbers in its resistance to the effects of ozone and inorganic acids, such as chromic, nitric, sulfuric, and phosphoric acids, as well as to the effects of concentrated alkalies, chlorine dioxide, and hydrogen peroxide. It is resistant to light, is impermeable to gas, and has good dielectric properties. The —SO2Cl groups and labile chlorine atoms participate in the vulcanization of chlorosulfonated polyethylene; a typical vulcanizing system consists of MgO, 2-mercaptobenzothiazole, diphenylguanidine, and rosin. The tensile strength of pure rubbers made of chlorosulfonated polyethylene may reach 32 meganewtons/m2 (320 kilograms-force/cm2), with a relative elongation of 350–600 percent. Such rubbers have high resistance to wear and repeated deformation. The temperature range for their most efficient use is –60° to 180°C. Chlorosulfonated polyethylene made from high-density polyethylene may also be used in unvulcanized form.

Chlorosulfonated polyethylene is used in the production of industrial and household goods and of anticorrosion coatings to be applied by the rubberizing method. It is used for insulating various cables, including ship cables. It is also used as a film-forming agent in varnishes and paints for the preservation of wood, metal, and reinforced concrete and as a base for adhesives and hermetic sealants.

The trade names of chlorosulfonated polyethylene are KhSPE in the USSR and Hypalon in the USA. In 1976, world production amounted to about 30,000 tons.

REFERENCE

Entsiklopediia polimerov, vol. 3. Moscow, 1977.

G. M. RONKIN

References in periodicals archive ?
Ltd, Thailand and chlorosulfonated polyethylene rubber (Hypalon 40) was supplied from Jiangxi Hongrun Chemical Co.
Chlorosulfonated polyethylene rubber (CSM) is a special purposed elastomer and it also exhibits for resistance to alcohol which contains in gasohol.
A strong relaxation appears at roughly -20[degrees]C, corresponding to the soft chlorosulfonated polyethylene segments.
CSPE], which can be considered an elastomer, a strong relaxation related to the chlorosulfonated polyethylene appears at roughly -20[degrees]C.
The dielectric response of chlorosulfonated polyethylene (CSPE), made by randomly chlorinating and chlorosulfonating polyethylene (PE), was determined using single-surface laboratory dielectric sensors.
The curvature in the data regressions, though, is similar to the trends reported earlier in this paper for Nafion (R) and for chlorosulfonated polyethylene.
Vara, "A comparison of chlorinated and chlorosulfonated polyethylene elastomers with other materials for automotive fuel hose covers," ACS Rubber Division, October 17-20, 2000, Cincinnati, OH.
Four chemically different polymers were investigated for suitability as fuel hose covers: Chlorosulfonated polyethylene, chlorinated polyethylene, acrylonitrile-butadiene rubber/polyvinyl chloride blend and epichlorohydrin terpolymer.
Today, chlorosulfonated polyethylene (CSM) is used as the tube stock for power steering hose, with a CSM or CPE cover.
In some halogenated polymers, such as chlorinated polyethylene (CPE), chlorosulfonated polyethylene (CSM), polychloroprene (CR) and epichlorohydrin (ECO), additives such as litharge, red lead, dibasic lead phthalate and dibasic lead phosphate are used to scavenge HCI produced in crosslinking, as well as from degradation during processing (ref.
Natural rubber Styrene-butadiene rubber Polybutadiene rubber Polyisoprene rubber Nitrile rubber Ethylene-propylene copolymer Ethylene-propylene terpolymer Acrylonitrile-butadiene-styrene Ethylene-vinyl acetate copolymer Silicone rubber Chlorinated polyethylene Fluorocarbon rubber Chlorosulfonated polyethylene Hydrogenated nitrile rubber Acrylic rubber Polyurethane rubber Polynorbornene Polyethylene
Eleven formulary sections are grouped according to elastomer type, including compounds based on natural rubber and polyisoprene, styrene-butadiene and butadiene, butyl and halobutyl, polychloroprene, EPDM, nitrile, chlorinated polyethylene and chlorosulfonated polyethylene, urethane, silicone and fluoroelastomers, acrylate and epichlorohydrin, and specialty rubbers.