Natural rubber has the characteristics of good elasticity, high mechanical strength, small hysteresis loss, flexural resistance, electrical insulation and other performance characteristics, and is an ideal raw material for the production of rubber sealing strips. However, the price of natural rubber is high and the price fluctuates greatly, and its own aging resistance is poor, so many rubber product manufacturers have begun to use reclaimed rubber in the rubber sealing strip formula with natural rubber as the main raw material to reduce costs and improve the processing technology performance and aging resistance of rubber compounds.
1. Natural rubber/latex reclaimed rubber and vulcanization formula for the production of light-colored rubber sealing strips
70 parts of natural rubber, 30 parts of white latex reclaimed rubber, 5 parts of zinc oxide, 2.5 parts of stearic acid, 2 parts of antioxidant D, 5 parts of paraffin, 200 parts of light calcium carbonate, 40 parts of lithopone powder, 80 parts of barium sulfate, 0.5 parts of accelerator DM, 0.3 parts of accelerator M, 2.5 parts of sulfur; Total 437.8 copies.
2. Natural rubber/isoprene reclaimed rubber and vulcanized formula for the production of extruded rubber strips
75 parts of natural rubber, 25 parts of isoprene reclaimed rubber, 5 parts of zinc oxide, 2 parts of stearic acid, 1 part of antioxidant SP, 4 parts of protective wax, 4 parts of paraffin, 70 parts of carbon black N550, 70 parts of heavy calcium carbonate, 20 parts of black ointment, 3 parts of petroleum jelly, 2 parts of accelerator CZ, 1 part of sulfur; Total 282 copies.
3. Natural rubber/butadiene rubber/tread reclaimed rubber and vulcanized formula with low-cost rubber sealing strip
15 parts of natural rubber, 10 parts of butadiene rubber, 75 parts of tire tread reclaimed rubber, 5 parts of zinc oxide, 0.5 parts of stearic acid, 1 part of antioxidant A, 1 part of paraffin, 10 parts of carbon black N330, 25 parts of light calcium carbonate, 10.5 parts of engine oil, 10.5 parts of industrial grease, 0.25 parts of accelerator D, 0.4 parts of accelerator DM, 1.35 parts of accelerator M, 0.1 part of accelerator TMTD, 2 parts of sulfur; Total 167.6 copies.
Recycled rubber is waste vulcanized rubber through crushing, heating, mechanical and chemical treatment and other physical and chemical processes, so that it from the elastic state into a certain plasticity and viscosity, can process and vulcanize rubber, the price is low and the price fluctuation is small, good plasticity, good vulcanization flatness, the expansion and contraction of the unvulcanized rubber mixed with reclaimed rubber during processing is much smaller than that of the unvulcanized rubber with only new rubber.
Reclaimed rubber can be divided into tire reclaimed rubber, natural latex reclaimed rubber, isoprene reclaimed rubber, butyl reclaimed rubber, EPDM reclaimed rubber, nitrile reclaimed rubber, etc., mixed with reclaimed rubber in the E4LYY1017formula of natural rubber sealing strips, we must choose the appropriate variety of reclaimed rubber according to the specific performance requirements of the sealing strip, reasonably determine the proportion of reclaimed rubber mixture, and adjust the formula appropriately.
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