EPDM is a copolymer of ethylene, propylene and a small amount of non-conjugated diene. It is a chemically stable saturated hydrocarbon in the main chain. It contains a very small amount of unsaturated double bonds in the side chain. It has excellent ozone resistance. Heat resistance, weather resistance and good vulcanization properties; EPDM rubber can be filled with a large amount of filler, which is one of the most commonly used raw materials in rubber seals, especially low-cost rubber seals. EPDM reclaimed rubber is processed from waste EPDM or waste EPDM rubber. It can be used together with other types of rubber to replace EPDM rubber to produce more cost-effective EPDM seals. So how do you choose the right compound for the EPDM reclaimed rubber seal?
1. Select the appropriate EPDM reclaimed rubber
The quality of EPDM reclaimed rubber products on the market is uneven. When rubber products manufacturers choose EPDM reclaimed rubber for their own sealing ring, they must first choose to cooperate with regular manufacturers. The three large and medium-sized reclaimed rubber factories produce three. The quality of Yuanyijia reclaimed rubber products is more stable, laying the foundation for subsequent normal production; the indicators of EPDM reclaimed rubber produced by different manufacturers are different, even the EPDM reclaimed rubber indexes produced by the same reclaimed rubber manufacturer are very different. : Rubber products manufacturers should not choose price when choosing EPDM reclaimed rubber. Do not take the two extreme roads of “the lower the price, the better the price or the higher the price”; the reclaimed rubber with too low price may need to be mixed. More proportion of EPDM original rubber, the price of EPDM reclaimed rubber exceeding the requirements of the sealing ring is high, and the cost is not cost-effective. Therefore, it is best to choose the reclaimed rubber that has the closest requirement to the EPDM sealing ring index. s Choice.
2. Select the glue used in the formula of EPDM seal ring
EPDM reclaimed rubber is not particularly compatible with other types of rubber. It is generally compatible with EPDM rubber and is used in combination with a small amount of styrene butadiene rubber, butyl rubber and butadiene rubber. Butadiene rubber is a structurally structured synthetic rubber which is polymerized from butadiene. It has excellent cold resistance, wear resistance and hand elasticity after vulcanization. It generates less heat under dynamic load. It is sealed with EPDM reclaimed rubber. When using the same amount of butadiene rubber and a small amount of styrene-butadiene rubber, the heat resistance, cold resistance, abrasion resistance, hand elasticity of the seal ring can be further improved, and various physical and mechanical properties can be improved, and the strength, the ductility and the resistance can be produced. A sealing ring with excellent high and low temperature performance.
In the actual production, when using EPDM reclaimed rubber and butadiene rubber and styrene-butadiene rubber to produce rubber sealing ring, it is best to adopt the process of mixing, opening and secondary vulcanization. Now the rubber is passed through the mixture. The machine is made of synthetic rubber, and then the synthetic rubber is molded in a mill and then subjected to secondary vulcanization, and finally processed in a subsequent process such as trimming. The price of EPDM reclaimed rubber is much lower than that of EPDM. The price of butadiene rubber and styrene-butadiene rubber is lower than that of EPDM rubber, and the production of EPDM sealing ring not only improves the sealing performance and service life of the sealing ring. It can also reduce production costs, and it is a good way to produce cost-effective sealing rings.