The windshield sealing strip is a sealing part installed amongn the windshield and the body frame of the car, which can prevent rain, dust, wind noise, etc. from entering the car, and at the same time play the role of heat insulation and sound insulation. EPDM reclaimed rubber is a recycled rubber resource processed by crushing, desulfurization, refining and other processes of EPDM reclaimed rubber or waste EPDM rubber products, which can replace part of EPDM rubber to prepare windshield seals and reduce the cost of raw materials.
1. The advantages of using EPDM reclaimed rubber for windshield seals
(1) Good performance: EPDM reclaimed rubber retains the basic performance characteristics of EPDM rubber, has excellent high and low temperature resistance, ozone resistance and weather resistance, which can meet the basic performance requirements of the windshield for the materials used, and the finished sealing strip can maintain a good sealing effect under extreme climatic conditions.
(2) Low price: the price of EPDM reclaimed rubber is much lower than that of EPDM rubber, and replacing part of EPDM rubber to produce windshield seals can effectively reduce the cost of raw materials.
(3) Good processing performance: compared with EPDM original rubber, EPDM reclaimed rubber has better plasticity, uniform dispersion of compounding agent, and low power consumption during mixing; Less heat generation for processing; The expansion and contraction of the unvulcanized rubber with EPDM reclaimed rubber is much smaller than that of the pure EPDM unvulcanized rubber during processing, and the processing is easy, and the shape and size of the finished product are more accurate.
2. EPDM rubber and EPDM reclaimed rubber are used together to produce windshield sealing strip vulcanization formula
Formula 1: 70 parts of EPDM rubber, 30 parts of EPDM reclaimed rubber, 4.5 parts of zinc oxide, 1 part of stearic acid, 4.5 parts of paraffin, 190 parts of carbon black N660, 120 parts of naphthenic oil, 2 parts of accelerator BZ, 1.4 parts of accelerator DM, 0.7 parts of accelerator TMTD, 1.6 parts of sulfur; Total 425.7 copies.
Formula 2: 60 parts of EPDM rubber, 40 parts of EPDM reclaimed rubber, 4.5 parts of zinc oxide, 1 part of stearic acid, 4.5 parts of paraffin, 100 parts of carbon black N550, 200 parts of carbon black N990, 150 parts of paraffin oil, 1 part of accelerator M, 1.5 parts of accelerator TMTD, 1 part of sulfur; Total 563.5 copies.
3. Problems to be considered in the design of windshield sealing strip formula containing EPDM reclaimed rubber
(1) Consider the environmental protection of reclaimed rubber. When using EPDM reclaimed rubber to replace part of EPDM original rubber to produce windshield seals, it is recommended to use environmentally friendly EPDM reclaimed rubber, which has no irritating odor, no pollution and no migration during use.
(2) Consider the extrusion process performance of the rubber compound. EPDM rubber/EPDM reclaimed rubber combined with glue formula uses ointment, mineral oil, clay, stearic acid and other compounding agents, which can improve the extrusion speed of semi-finished products of windshield sealing strips and ensure the smoothness of semi-finished products; Paste and magnesium carbonate can reduce the deformation of semi-finished products during parking.
(3) Consider the plasticity of the rubber compound. Appropriately improve the plasticity of EPDM rubber/EPDM reclaimed rubber and rubber material, increase the fluidity of the rubber compound, ensure the smooth surface of the semi-finished product, reduce the extrusion scorch, and improve the extrusion speed.
Windshield sealing strip is an elastic sealing component that forms a sealing barrier by tightly fitting the windshield edge and body structure, and its performance directly affects the E4LYY520 performance of the vehicle for waterproof, dustproof, sound and thermal insulation. When using EPDM reclaimed rubber instead of EPDM rubber to produce windshield seals, choose high-quality EPDM reclaimed rubber, and appropriately adjust the formula and production process conditions, which can achieve a balance among cost and performance, meet the needs of more users, and improve the economic benefits of sealing strip manufacturers.
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