Sponge rubber gasket is a sponge sealing product made of natural rubber or synthetic rubber for sealing, shock absorption, cushioning, sound insulation, and anti-slip, which is widely used in construction, machinery, automobiles, electronics, aerospace and other fields. Natural rubber has the characteristics of high mechanical strength, good elasticity and wear resistance, and is an ideal raw material for the production of sponge sealing gaskets; The rational use of reclaimed rubber in natural rubber sponge sealing gaskets can not only reduce the cost of raw materials, but also improve the processing technology performance of gasket rubber and the aging resistance of finished products.
1. What reclaimed rubber can be mixed with natural rubber sponge sealing gasket
(1) Latex reclaimed rubber
It is processed from waste natural rubber, waste latex and its products as raw materials, with the basic performance characteristics of natural rubber, good elasticity, high tensile strength and high elongation at break, which can replace natural rubber in whole or in part E4LYY87 produce sponge sealing gaskets and reduce the cost of raw materials. When the sponge rubber sealing gasket is mixed with latex reclaimed rubber to reduce costs, it is recommended to choose black latex reclaimed rubber for black sponge gasket, which is lower in price; The light-colored sponge sealing gasket is made of white natural latex reclaimed rubber, with white color and easy color matching.
(2) Tire reclaimed rubber
Tire reclaimed rubber is a waste tire through crushing, desulfurization, refining and other processes to complete the regenerated rubber resources, the main components are natural rubber, synthetic rubber and carbon black, low price, good elasticity, wear resistance, tear resistance, good fluidity, less processing heat, good compatibility with natural rubber, can be used alone or with natural rubber to produce sponge rubber sealing gasket, reduce the cost of raw materials. When the sponge sealing gasket has requirements for environmental protection and odorlessness, it is recommended to choose environmentally friendly tire reclaimed rubber and odorless tire reclaimed rubber.
2. Natural rubber and reclaimed rubber are used together to produce sponge sealing gasket vulcanization formula
(1) Natural rubber/recycled rubber and vulcanization formula for the production of molded sponge shock-absorbing gaskets
75 parts of natural rubber, 25 parts of reclaimed rubber, 4 parts of zinc oxide, 3.5 parts of stearic acid, 0.8 parts of antioxidant 4010, 1.5 parts of antioxidant RD, 1.2 parts of paraffin, 15 parts of carbon black N774, 90 parts of light calcium carbonate, 15 parts of engine oil, 0.75 parts of accelerator CZ, 0.95 parts of sulfur, 2.3 parts of foaming agent H, 3.8 parts of sodium bicarbonate; total: 238.8 parts.
(2) Natural rubber/latex reclaimed rubber and vulcanization formula for the production of white sponge shock-absorbing gasket
50 parts of natural rubber, 50 parts of white latex reclaimed rubber, 3.5 parts of zinc oxide, 2.5 parts of stearic acid, 1.8 parts of antioxidant DOD, 1.8 parts of paraffin, 35 parts of light calcium carbonate, 8.5 parts of titanium dioxide, 6 parts of petrolatum, 1.6 parts of triethanolamine, 2.2 parts of DCP, 3.5 parts of foaming agent H, 0.4 parts of urea, 2.6 parts of water; Total 169.5 copies.
(3) Natural rubber/latex reclaimed rubber is used to produce a vulcanization formula for black sponge shock-absorbing gaskets
50 parts of natural rubber, 50 parts of black latex reclaimed rubber, 1.8 parts of zinc oxide, 5.2 parts of stearic acid, 1.8 parts of antioxidant D, 1.8 parts of paraffin, 26 parts of spray carbon black, 13 parts of petroleum jelly, 4.3 parts of asphalt, 0.7 parts of accelerator DM, 2.2 parts of sulfur, 3.5 parts of foaming agent H, 0.8 parts of urea, 4.3 parts of water; Total 165.4 copies.
In the sponge rubber sealing gasket with natural rubber as the main raw material to reduce the cost of reclaimed rubber, it is not only necessary to choose the right reclaimed rubber products, reasonably determine the mixing ratio of reclaimed rubber and production formula, but also need to strictly control the production process parameters.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits