EPDM rubber is a rubber copolymerized by ethylene and p […]
EPDM rubber is a rubber copolymerized by ethylene and propylene through a solution, and a third monomer (ENB) is introduced. EPDM is basically a saturated polymer, with very good aging resistance, good weather resistance, excellent electrical insulation, good chemical resistance and good impact elasticity.
Characteristics and uses of EPDM
The main disadvantage of ethylene-propylene rubber is the slow vulcanization speed; it is difficult to use it with other unsaturated rubbers, and the self-adhesion and mutual adhesion are very poor, so the processing performance is not good. NBR nitrile rubber sealing strip-suitable for use in petroleum-based hydraulic oil, glycol-based hydraulic oil, diester-based lubricants, gasoline, water, silicone grease, silicone oil and other media. It is the most widely used and lowest cost rubber seal. Not suitable for polar solvents such as ketones, ozone, nitro hydrocarbons, MEK and chloroform. The general use temperature range is -40~120 ℃. HNBR hydrogenated nitrile rubber sealing strip-has excellent corrosion resistance, tear resistance and compression deformation characteristics, good ozone resistance, sunlight resistance, weather resistance. It has better abrasion resistance than nitrile rubber. It is suitable for washing machinery, automobile engine system and refrigeration system using new environmental protection refrigerant R134a. Not recommended for use in alcohols, esters or aromatic solutions. The general temperature range is -40~150 ℃. SIL silicone rubber sealing strip-has excellent heat resistance, cold resistance, ozone resistance, atmospheric aging resistance. Has good insulation properties. However, the tensile strength is inferior to ordinary rubber and not oil resistant. Suitable for household appliances such as electric water heaters, electric irons, microwave ovens, etc. It is also suitable for all kinds of articles that come into contact with the human body, such as kettles and water dispensers.
Recommendation: Not recommended for use in most concentrated solvents, oils, concentrated acids and sodium hydroxide. The general temperature range is -55~250 ℃.
Modified varieties of ethylene propylene rubber
Since the successful development of EPDM and EPDM in the late 1950s and early 1960s, a variety of modified ethylene-propylene rubbers and thermoplastic ethylene-propylene rubbers (such as EPDM/PE) have appeared in the world. The wide application of ethylene-propylene rubber provides many varieties and grades. Modified ethylene-propylene rubber is mainly used for bromination, chlorination, sulfonation, maleic anhydride, maleic anhydride, silicone modified, nylon modified, etc. Ethylene-propylene rubber also has grafted acrylonitrile, acrylate, etc. Over the years, many polymer materials with good comprehensive properties have been obtained by means of blending, copolymerization, filling, grafting, reinforcement and molecular compounding. Through modification, ethylene-propylene rubber has also been greatly improved in performance, thereby expanding the application range of ethylene-propylene rubber.
Application of ethylene propylene rubber
Brominated ethylene-propylene rubber: processed with brominating agent on an open mill. After bromination, ethylene-propylene rubber can improve its vulcanization speed and adhesion performance, but the mechanical strength is reduced, so brominated ethylene-propylene rubber is only suitable as an intermediary layer for the adhesion of ethylene-propylene rubber to other rubbers.
Chlorinated ethylene-propylene rubber: made by passing chlorine gas in EPDM rubber solution. After chlorination of ethylene-propylene rubber can improve the vulcanization speed and the compatibility with the unsaturated consultation, flame resistance, oil resistance, adhesion performance has also been improved.
Sulfonated Ethylene Propylene Rubber: Dissolve EPDM rubber in a solvent and treat it with a sulfonating agent neutralizer. The sulfonated ethylene-propylene rubber will be widely used in adhesives, coated fabrics, building waterproof lean meat, anti-corrosion lining, etc. due to its physique and good adhesion properties.
Acrylonitrile grafted ethylene propylene rubber
Acrylonitrile is grafted onto ethylene propylene rubber. Acrylonitrile-modified ethylene-propylene rubber not only retains the corrosion resistance of ethylene-propylene rubber, but also obtains oil resistance equivalent to nitrile-26, and has good physical and mechanical properties and processing properties.
Thermoplastic ethylene-propylene rubber
Thermoplastic ethylene-propylene rubber (EPDM/PP) is mainly composed of EPDM rubber and polypropylene. At the same time, the ethylene propylene rubber reaches the expected degree of crosslinking. Not only does it retain the inherent characteristics of ethylene-propylene rubber in terms of performance, but it also has significant technological properties for injection, extrusion, blow molding and calendering of thermoplastics.
In addition, modified ethylene-propylene rubber also includes chlorosulfonated ethylene-propylene rubber, acrylate grafted ethylene-propylene rubber and so on.