Ethylene-propylene rubber has the characteristics of ozone resistance, weather resistance, chemical resistance, electrical insulation, etc., and has a wide range of operating temperatures. It is an ideal raw material for the production of rubber rollers in the fields of plastic printing machinery, tanning machinery, and general machinery. The finished rubber roller can be It can be used for a long time at a temperature of minus 65 ℃ to plus 140 ℃. EPDM reclaimed rubber retains the basic performance characteristics of EPDM original rubber, and can be used together with the original rubber to produce rubber rollers, effectively reducing the cost of raw materials on the premise of ensuring product quality.
1. The maximum operating temperature of the EPDM reclaimed rubber roller
EPDM reclaimed rubber has excellent heat resistance, and the EPDM rubber roller produced in combination with EPDM rubber can be used for a long time at 120 °C, and the maximum operating temperature is 150 °C. In actual production, the heat resistance of butyl rubber is better than that of ethylene-propylene rubber, and the aging types of butyl rubber and ethylene-propylene rubber are different, so when using EPDM rubber/EPDM reclaimed rubber 2ELYY824 to produce rubber rollers, it can be Add an appropriate amount of butyl rubber or butyl reclaimed rubber to further increase the maximum operating temperature of the rubber roller containing EPDM reclaimed rubber.
2. Formula design of rubber roller for EPDM/reclaimed rubber production
When producing rubber rollers with EPDM rubber rollers as the main raw material, the surface rubber of the rubber rollers is required to have certain mechanical properties such as hardness, tensile strength, elasticity, etc. Among them, the hardness is more important; The use effect, among which the reinforcing agent and the filler are important indicators that affect the hardness of the rubber roller.
In actual production, low-hardness EPDM/reclaimed rubber rollers are generally used together with oil-filled EPDM and EPDM reclaimed rubber, and can be reinforced with quick-pressing furnace black, semi-reinforced carbon black, etc. , calcium carbonate filling, a lot of use of paraffin oil, black ointment and other softeners. Compared with low-hardness EPDM reclaimed rubber rollers, in the production of rubber rollers with Shore hardness above 50 degrees, the amount of softeners such as rubber oil is much less.
3. General reference formula for EPDM reclaimed rubber/reclaimed rubber production rubber roller:
70 parts of EPDM rubber, 30 parts of EPDM reclaimed rubber, 70 parts of carbon black N550, 45 parts of paraffin oil, 5 parts of zinc oxide, 1 part of stearic acid, 6 parts of DCP, 2 parts of EGDMA; total: 229 share.
In actual production, EPDM reclaimed rubber can be used together with EPDM rubber, butyl rubber and butyl reclaimed rubber to produce rubber roller products with Shore hardness 20-70 degrees; EPDM with different hardness The use of propylene rubber rollers is different, and the variety and dosage of rubber raw materials and accessories used are very different. Later, the editor will continue to share with you the specific formula design and processing points of EPDM reclaimed rubber in the production of rubber rollers.
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