EPDM reclaimed rubber has excellent resistance to high and low, aging resistance, so it can be used to replace the original EPDM rubber production of various rubber products, significantly reduce the cost of raw materials, high temperature steam tube is one of them. When using EPDM reclaimed rubber to produce high temperature resistant steam pipes, the choice of EPDM reclaimed rubber and the design of the system will affect the high temperature resistance and service life of the high temperature steam pipe.
Formulation 1: EPDM reclaimed rubber (containing 70% of glue), 100 parts; zinc oxide, 3.5 parts; stearic acid, 0.7 parts; antioxidant, 1.5 parts; carbon black, 45 parts; DCP, 2 parts; TAC, 1 part; Total: 153.8 parts.
Formulation 2: EPDM reclaimed rubber (containing 70% of gel), 100 parts; zinc oxide, 3.5 parts; stearic acid, 0.7 parts; carbon black, 104 parts; paraffin oil, 52 parts; accelerator, 2.8 parts Sulphur, 1.5 parts; Total: 264.5 parts.
In formula one, in order to further improve the heat-resistant oxygen aging performance of the EPDM regenerated rubber steam pipe and extend the service life of the hose, the anti-aging agent RD and the antioxidant D can be used in a ratio of 2:1; Black can use N550 to improve the high temperature performance, reinforcement, elasticity and resilience of EPDM heat-resistant steam pipe, or be used together with carbon black N990; steam pipe produced by formula 1 using peroxide DCP vulcanization The heat resistance is better. In formula II, sulphur is used for vulcanization. The vulcanization system can be designed by using a variety of accelerators, such as accelerator M, accelerator PZ, accelerator TE, and promoter TT.
In the actual production, the regenerative rubber of the EPDM regenerated rubber steam pipe has the greatest influence on its heat resistance and service life. Therefore, as far as possible, the EPDM reclaimed rubber with high rubber content should be selected. , Or in the EPDM reclaimed rubber steam pipe and with the right amount of EPDM, improve the formula gel content to improve the steam tube heat resistance, anti-aging properties. In order to ensure the smooth extrusion of the steam pipe and the smooth surface, it is best to choose EPDM reclaimed rubber with more than 60 mesh.
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