The price of EPDM reclaimed rubber is lower than that of original rubber, and its fluidity, plasticity and product dimensional stability are superior to EPDM original rubber, so it is sought after by the majority of rubber products manufacturers. However, EPDM reclaimed rubber is a product of recycling and reprocessing of waste rubber products. Its mechanical strength and high temperature resistance have a certain gap with the original rubber. Then, in the actual production process, whether EPDM reclaimed rubber can produce high temperature resistance What about rubber parts? If so, how do you design a high heat resistant rubber part with EPDM reclaimed rubber?
1. EPDM reclaimed rubber produces high heat-resistant rubber parts with a formula
Generally, high heat-resistant rubber parts work in the environment of 200-230 °C, with EPDM rubber as the main raw material; EPDM reclaimed rubber retains the basic performance characteristics of EPDM original rubber, and has excellent high temperature resistance and aging resistance; However, there is still a certain gap between the heat resistance and mechanical strength of the EPDM reclaimed rubber. Therefore, when using EPDM reclaimed rubber to produce high heat-resistant rubber parts, it is necessary to select a high-gum content EPDM reclaimed rubber, and The EPDM rubber is used in combination, and the rubber content of the whole formula is controlled to be more than 50% to ensure the performance and life of the rubber parts at high temperatures.
2. EPDM reclaimed rubber to produce high heat-resistant rubber parts vulcanization system
When using EPDM reclaimed rubber to produce high temperature resistant rubber products, peroxide vulcanization is generally selected, and the vulcanized rubber has excellent heat resistance. In the formulation of EPDM high heat-resistant rubber parts, DCP can be selected as the vulcanizing agent of the vulcanization system, and it is used together with the accelerator TAC, usually 3 parts of DCP with 2.5 parts of TAC; EPDM high heat-resistant rubber parts can also be selected for peroxidation. The sulfurization system used in combination with sulfur, the ratio of DCP/sulfur is controlled at about 9/1, or the dicumyl peroxide and the crosslinking agent TAIC are used in a ratio of 1:1.
In the vulcanization system of EPDM reclaimed rubber high heat-resistant rubber parts, the combination of zinc oxide, magnesium oxide and stearic acid is needed to further improve the comprehensive performance of the EPDM rubber vulcanizate.
3. EPDM reclaimed rubber to produce high heat-resistant rubber parts reinforcement system
The most commonly used rubber product reinforcement system is carbon black, which can improve the mechanical strength and heat resistance of rubber products. Carbon black is used as a reinforcing system in high heat-resistant rubber parts with EPDM recycled rubber as the main raw material. The reinforcing agent in the middle is most suitable. There are many kinds of carbon black, among which high wear-resistant carbon black can significantly improve the tensile strength, tear strength, wear resistance and aging resistance of EPDM rubber parts; spray carbon black can improve the processing performance and elasticity of EPDM rubber. Reduce shrinkage, heat generation and deformation, improve the modulus of the rubber compound, is a commonly used material for high temperature resistant rubber parts; high wear resistant carbon black and spray carbon black can be used when producing high heat resistant rubber parts using EPDM reclaimed rubber It is used in a ratio of 2:1 to improve the physical and mechanical properties and heat resistance of the EPDM reclaimed rubber.
4. EPDM reclaimed rubber produces softening system for high heat resistant rubber parts
The softening system can improve the processing performance of the rubber compound, mainly including the plasticity, fluidity and adhesion of the rubber compound. In the formulation of high heat-resistant rubber parts produced by EPDM reclaimed rubber, DPB can be selected as a compounding agent in the softening system. DBP, dibutyl phthalate, improves the thermal stability, flex resistance, adhesion and water repellency of rubber parts.