Corrosion Resistance Of Common Valve Materials-Styrene Butadiene Rubber and EPDM
Styrene butadiene rubber (SBR), also known as polystyrene butadiene copolymer.
The processing performance and product performance are close to that of natural rubber. Some properties such as wear resistance, heat resistance, aging resistance and vulcanization speed are better than natural rubber. They can be used in combination with natural rubber and a variety of synthetic rubber. It is widely used in tire, tape, rubber tube, wire and cable, medical appliance and rubber products. It is the largest general synthetic rubber variety, It is also one of the earliest rubber varieties to realize industrialization.
Ethylene propylene rubber is a synthetic rubber with ethylene and propylene as the main monomers. According to the composition of monomers in the molecular chain, it can be divided into ethylene propylene diene monomer and ethylene propylene diene monomer. The former is a copolymer of ethylene and propylene, expressed as EPM, while the latter is a copolymer of ethylene, propylene and a small amount of non conjugated diene third monomer, expressed as EPDM. Both are collectively referred to as ethylene propylene rubber.
It has good resistance to various polar chemicals such as alcohol, acid, alkali, oxidant, refrigerant, detergent, animal and vegetable oil, ketone and grease; However, it has poor stability in aliphatic and aromatic solvents (such as gasoline, benzene, etc.) and mineral oils. Under the action of concentrated acid for a long time, the performance will also decline. It is widely used in automobile parts, waterproof materials for construction, wire and cable sheaths, heat-resistant hose, adhesive tape, automobile seals, lubricating oil additives and other products.
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