Automobile radiator hoses have high requirements for the heat resistance of rubber compounds, and are generally processed with EPDM rubber as the main raw material. EPDM reclaimed rubber retains the basic performance characteristics of EPDM, with excellent high temperature resistance and aging resistance, which can replace part of EPDM original rubber to produce radiator hoses and reduce the cost of raw materials. When the hose of the automobile radiator is mixed with EPDM reclaimed rubber, the following problems need to be paid attention to.
1. Quality control of EPDM reclaimed rubber
When choosing EPDM reclaimed rubber for automotive radiator hoses, choose reclaimed rubber products that are close to the physical properties of the hose to ensure that the quality of EPDM reclaimed rubber meets the requirements and cannot contain too many impurities or aging components. It is recommended that automotive radiator hose manufacturers directly cooperate with regular reclaimed rubber factories when using EPDM reclaimed rubber to reduce costs, so as to ensure stable product quality and sufficient inventory, so as to avoid the problem that the radiator hose cannot be produced normally due to the fluctuation of EPDM reclaimed rubber quality or sudden out-of-stock.
2. Proportion control of EPDM reclaimed rubber
When using EPDM rubber as the main raw material to produce automotive radiator hoses, it is recommended to choose EPDM original rubber with narrow or medium molecular weight distribution to maintain high physical and mechanical properties and aging resistance. When the radiator hose is mixed with EPDM reclaimed rubber, it is necessary to reasonably determine the ratio of EPDM rubber to reclaimed rubber, which is generally determined according to the performance requirements and cost budget of the product.
3. Key points of the formula design of the automobile radiator hose mixed with EPDM reclaimed rubber
When EPDM rubber and EPDM reclaimed rubber are used together to produce automotive radiator hoses, sulfur sulfur system and peroxide vulcanization system are commonly used, and TMTD/BZ/DTDM, CZ/TMTD/TRA and other sulfur vulcanization can be used; When heat resistance is required, peroxide vulcanization or sulfur donor vulcanization can be used. The hose of the EPDM radiator is mostly reinforced with fast-pressing furnace black, high-definition and elongated semi-reinforcing furnace black, and general-purpose furnace black; It is recommended to use varieties with good high temperature resistance and high flash point for operating oils.
When using EPDM reclaimed rubber to replace part of EPDM original rubber in the production of automotive radiator hoses, the production process should be strictly controlled, and the vulcanization conditions, temperature and time should be adjusted. To design the radiator hose formula containing EPDM reclaimed rubber E4LYY320, it is necessary to balance the mixing ratio of reclaimed rubber to ensure the heat resistance, ozone resistance of the product, etc., and improve the tensile strength, tear strength, elongation at break, hardness and other indicators of the finished product. Subsequently, we will share with you the vulcanization formula of EPDM reclaimed rubber and EPDM rubber for the production of automotive radiator hoses.
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