EPDM reclaimed rubber is processed from EPDM head glue or waste EPDM rubber products as raw materials, which has the performance characteristics of high and low temperature resistance, aging resistance, high insulation, ozone resistance, erosion resistance, etc., and can be used alone or combined with EPDM rubber and butyl rubber to produce various types of heat-resistant rubber sheets, which can effectively reduce the cost of raw materials under the premise of ensuring the heat resistance of the finished product. Xiaobian today shares with you several EPDM reclaimed rubber production of heat-resistant rubber plate vulcanization formula and formula design points.
1. EPDM reclaimed rubber produces a vulcanization formula for heat-resistant rubber sheets
(1) 70 parts of EPDM rubber, 30 parts of EPDM reclaimed rubber, 3.5 parts of zinc oxide, 1 part of stearic acid, 63 parts of carbon black N660, 77 parts of carbon black N770, 70 parts of paraffin oil, 2.1 parts of accelerator BZ, 2.1 parts of accelerator PZ, 2.1 parts of accelerator TMTD, 0.4 parts of sulfur, 1.4 parts of vulcanizing agent DTDM; Total 322.6 copies.
(2) 80 parts of EPDM rubber, 20 parts of EPDM reclaimed rubber, 1 part of antioxidant, 80 parts of carbon black N770, 40 parts of paraffin oil, 7 parts of cumene peroxide (DCP), 1.5 parts of vulcanization additive TAC, total: 229.5 parts.
(3) 70 parts of butyl rubber, 30 parts of EPDM reclaimed rubber, 5 parts of zinc oxide, 1 part of stearic acid, 3 parts of paraffin, 40 parts of carbon black N330, 13 parts of carbon black N660, 20 parts of clay, 20 parts of heavy calcium carbonate, 7 parts of naphthenic oil, 4 parts of petroleum jelly, 0.5 parts of accelerator M, 1.5 parts of accelerator PZ, 0.5 parts of accelerator TL, 1 part of sulfur; Total 216.5 copies.
2. EPDM reclaimed rubber production of heat-resistant rubber sheet formula design
Heat-resistant rubber sheet needs to maintain good physical and mechanical properties in a high-temperature environment, including elasticity, hardness, tensile strength, etc., with heat aging resistance, ozone resistance and other properties. By rationally using EPDM reclaimed rubber to replace part of EPDM original rubber, the cost of raw materials can be reduced.
(1) Vulcanization system: EPDM rubber/EPDM reclaimed rubber, butyl rubber/EPDM reclaimed rubber rubber are used together to produce heat-resistant rubber sheets, and low-sulfur vulcanization system or peroxide vulcanization system is mostly selected, and the vulcanized rubber has good heat resistance.
(2) Reinforcing filling system: high wear-resistant carbon black can improve the wear resistance and tensile strength of EPDM/reclaimed rubber compound; On the basis of ensuring heat resistance, general-purpose furnace black can provide better E4LYY79 mechanical properties and processing properties; Semi-reinforcing carbon black has the dual functions of reinforcement and filling, giving the rubber high elongation, low heat generation, high elasticity and good aging resistance. Inorganic fillers have better heat resistance, which can improve the heat resistance of vulcanized rubber.
(3) Softening and plasticizing system: choose paraffin-based high boiling point operating oil to reduce the migration and volatilization of softener at high temperature, and maintain the flexibility and elasticity of rubber sheet; EPDM rubber has good compatibility with naphthenic oil, and it should be noted that naphthenic oil has a higher volatile content.
(4) Anti-aging system: use antioxidants MB/RD, MB, DNP, RD, etc. to further improve the aging resistance of rubber sheets; Amine antioxidants should not be used for EPDM reclaimed rubber heat-resistant rubber sheets using peroxide vulcanization.
With EPDM rubber and EPDM reclaimed rubber as the main raw materials to produce heat-resistant rubber sheets, the finished product has the characteristics of high temperature resistance, ozone resistance, aging resistance, impact resistance, etc., and is widely used in transportation, industry, construction, new energy and other fields. EPDM rubber/reclaimed rubber combined with rubber to produce heat-resistant rubber plates, it is also necessary to appropriately adjust the production process, such as when mixing, it is recommended to fully temper EPDM original rubber and then mix it with reclaimed rubber to ensure uniform dispersion.
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