Since the successful development of EPDM and EPDM rubber in the late 1950s and early 1960s, a variety of modified ethylene propylene rubber and thermoplastic ethylene propylene rubber (such as EPDM/PE) have appeared in the world. The wide application of ethylene propylene rubber provides a wide variety of varieties and grades. The modified ethylene-propylene rubber is mainly used for bromination, chlorination, sulfonation, maleic anhydride, maleic anhydride, silicone modification, and nylon modification. Ethylene-propylene rubber is also grafted with acrylonitrile, acrylate, and the like. Over the years, many polymer materials with good comprehensive properties have been obtained by means of blending, copolymerization, filling, grafting, reinforcement and molecular compounding. The modification of ethylene-propylene rubber has also greatly improved the performance, which has expanded the application range of ethylene-propylene rubber.
Ethylene propylene bromide rubber is treated with a brominating agent on an open mill. After bromination, ethylene propylene rubber can improve its vulcanization speed and adhesive performance, but the mechanical strength is reduced. Therefore, ethylene bromide rubber is only suitable for the interfacing layer of ethylene propylene rubber and other rubber.
Ethylene propylene chloride rubber is made by passing chlorine gas through a solution of ethylene propylene diene rubber. After chlorination of ethylene propylene rubber, the vulcanization speed and compatibility with unsaturated sputum, fire resistance, oil resistance and adhesion properties are also improved.
The sulfonated ethylene propylene rubber is prepared by dissolving ethylene propylene diene monomer in a solvent and treating it with a sulfonating agent rubber neutralizing agent. Sulfonated ethylene-propylene rubber will be widely used in adhesives, coated fabrics, building waterproof lean meat, anti-corrosion lining, etc. due to its thermoplastic elastomer and good adhesion properties.
The acrylonitrile-grafted ethylene-propylene rubber was grafted with ethylene propylene rubber at 80 ° C using toluene as a solvent and benzyl chloride as an initiator. The acrylonitrile-modified ethylene-propylene rubber not only retains the corrosion resistance of ethylene-propylene rubber, but also obtains the oil resistance equivalent to nitrile-26, and has good physical and mechanical properties and processing properties.
Thermoplastic ethylene propylene rubber (EPDM/PP) is based on EPDM rubber and is mixed with polypropylene. At the same time, the ethylene propylene rubber reaches the product of the expected degree of crosslinking. Not only does it retain the inherent properties of ethylene propylene rubber in terms of performance, but it also has significant process properties for injection, extrusion, blow molding and calendering of thermoplastics.
In addition, the modified ethylene propylene rubber is also chlorosulfonated ethylene propylene phthalate, acrylate grafted ethylene propylene rubber and the like.