Rubber formula revealed: How to make rubber more wear-resistant and heat-resistant?

The performance of rubber products, such as wear resistance and high temperature resistance, directly depends on their formula design. By scientifically adjusting the base material, vulcanization system, reinforcement filling system, and protective system, the service life of rubber in harsh environments can be significantly improved. The following are key formula optimization strategies:
1、 Base material selection: the cornerstone of performance
Wear resistance priority: Polyurethane rubber has far superior wear resistance compared to other materials, exhibiting excellent performance at room temperature, but its performance will sharply decrease at high temperatures. Chlorosulfonated polyethylene rubber can maintain good wear resistance in high temperature environments and is suitable for dynamic sealing applications.
High temperature resistance strengthening: Fluororubber (FKM), with its stable C-F bond structure, can withstand high temperatures up to 250 ° C, making it an ideal choice for high-temperature seals. Silicone rubber (VMQ) works stably within the range of -50 ° C to 230 ° C, but requires reinforcement of mechanical strength through fillers.
2、 Sulfurization system: Crosslinking determines durability
Wear resistance optimization: The degree of vulcanization needs to be precisely controlled. If the crosslinking density is too high, it will cause the material to harden, while if it is too low, it is prone to wear. Nitrile rubber adopts a low sulfur and high vulcanization promoting system to reduce compression set and improve dynamic wear resistance.
High temperature resistance improvement: Peroxide vulcanization (such as DCP) can form more stable C-C cross-linking bonds, allowing rubber to maintain elasticity above 150 ° C, significantly better than traditional sulfur vulcanization.
3、 Reinforcement filling system: balancing performance and cost
Wear resistance enhancement: Carbon black is the preferred reinforcing agent, and the smaller the particle size and the larger the dosage, the more significant the improvement in wear resistance. However, excessive filling can damage processability and needs to be combined with semi reinforced carbon black to balance elasticity and cost.
High temperature resistant auxiliary: Thermal conductive fillers such as carbon nanotubes can quickly dissipate heat, reduce degradation caused by local high temperatures, and extend the life of rubber in hot environments.
4、 Protection system: resist environmental erosion
Antioxidant combination: The main antioxidant (such as hindered phenol) directly neutralizes free radicals, while the auxiliary antioxidant (such as hypophosphite) decomposes peroxides, providing dual protection and delaying aging.
Ozone prevention design: Protective wax (such as 254 wax) forms a protective layer on the rubber surface, with a dosage of ≥ 0.8 parts to ensure effective ozone prevention while also considering appearance requirements.
5、 Process control: Details determine success or failure
Uniformity of mixing: Uneven dispersion of fillers can lead to local “hot spots” and accelerate aging. It is recommended to control the mixing temperature between 110-125 ° C and thin it at least 6 times.
Secondary vulcanization: High temperature baking (such as treating fluororubber at 250 ° C for 24 hours) can completely remove impurities and extend the heat-resistant life by 50%.
Through the optimization of the above formula, rubber products can maintain stable performance under harsh conditions such as high temperature and dynamic friction, meeting the long-term needs of industrial sealing, automotive parts and other fields.