EPDM recycled rubber retains the basic performance characteristics of EPDM rubber, with excellent high and low temperature resistance and ozone resistance, and can be used alone or in combination with EPDM and butyl rubber to produce automotive seals, effectively reducing the cost of raw materials. When using EPDM recycled rubber to reduce the production cost of rubber sealing strips, sealing strip manufacturers must choose the appropriate recycled rubber according to actual needs to lay a solid foundation for subsequent production.
1. Vulcanization formula of automobile windshield seals mixed with EPDM recycled rubber
25 parts of EPDM rubber, 45 parts of oil-filled EPDM rubber, 30 parts of EPDM recycled rubber, 3.2 parts of zinc oxide, 0.6 parts of stearic acid, 70 parts of carbon black N550, 32 parts of carbon black N772, 19 parts of paraffin oil, 0.62 parts of accelerator BZ, 0.62 parts of accelerator M, 0.34 parts of accelerator TMTD, 0.62 parts of sulfur; A total of 227 copies.
2. Performance requirements for automobile door and window seals
The main function is to fill the gap among car doors and windows and the body, and play multiple roles such as sealing, waterproof, dustproof, sound insulation, heat insulation, shock absorption and fixation.
(1) Appearance requirements: In order to ensure the good sealing performance of the automobile sealing strip, it is required that its cross-sectional shape and size are consistent with the body shape, uniform appearance color, smooth and flat surface, and no obvious defects visible to the naked eye, such as bulging and vulcanization marks.
(2) Mechanical property requirements: Automobile door and window seals need to have appropriate hardness, certain tensile strength and tear elongation, as well as good compression set resistance to ensure that the sealing strip maintains a stable shape and size during installation and use, and can quickly return to its original state after compression, maintaining good sealing performance.
(3) Aging performance requirements: The long-term exposure of automobiles to the outdoors requires the rubber material for sealing strips to have good ozone aging resistance, high and low temperature resistance, etc., and is not prone to cracking, deformation and other problems during use.
(4) Good processing performance.
3. Selection skills for EPDM recycled rubber for automobile door and window seals
When using EPDM recycled rubber to reduce costs for automotive door and window seals with EPDM rubber as the main raw material, it is recommended to choose high-fineness, impurity-free EPDM recycled adhesive, the surface of the finished product is smooth and bright, and it is not easy to bubble; EPDM recycled rubber with high glue content has better resistance to high and low temperatures and ozone; Choose EPDM recycled adhesive with a hardness of 50-70 degrees, a tensile strength of 8-12MPa, and a tear-off elongation among 300%-500%, which has good processing and use performance.
Compared with EPDM rubber, EPDM recycled rubber has good plasticity and fluidity, low compounding power consumption, and small expansion and contraction of unvulcanized rubber. The automotive sealing strips produced by EPDM recycled rubber alone or in combination with the original rubber are widely used in the front windshield, window inside E5LYY331, rear windshield, rear triangular window, window lower edge and other sealing parts.
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