Technical and Control Methods to Slow Aging and Deterioration of High-temperature Resistant Rubber Plugs
High-temperature resistant rubber plugs are widely equipped in new energy electronic control modules, energy storage assemblies and industrial high-temperature equipment to realize sealing, insulation and plugging functions. Affected by high-temperature oxidation, medium immersion, external compression and environmental corrosion, molecular chains of rubber materials break gradually, resulting in hardening, cracking, swelling and sealing failure. Complete elimination of aging is impossible, yet full-chain management covering raw material selection, production, storage, assembly and maintenance can markedly slow down deterioration and extend service life of finished products.
1. Raw Material Formula Control to Consolidate Anti-aging Performance Base
Aging rate of rubber plugs is primarily determined by base rubber selection and formula design. Material selection shall comply with actual operating temperature: modified high-temperature resistant silicone rubber is adopted for working temperature below 120℃ with outstanding elasticity, UV resistance and anti-oxidation property; fluororubber is preferred under continuous working temperature over 150℃ with exposure to electrolyte and lubricant, whose stable molecular structure resists thermal cracking and chemical erosion effectively. Long-term antioxidants and heat stabilizers are proportionally added during formulation mixing to retard oxidative fracture of rubber molecules under high temperature. The addition of cheap fillers such as calcium carbonate and talcum powder is strictly limited, as excessive fillers destroy rubber compactness and degrade heat resistance and anti-aging capacity. Raw materials shall pass thermal aging coefficient inspection before warehousing, and inferior recycled rubber is forbidden to enter production to avoid congenital aging defects.
2. Optimization of Vulcanization and Molding Process to Eliminate Hidden Internal Aging Risks
Defective molding processes induce hidden aging problems even with premium raw materials. Three core parameters including temperature, duration and pressure are precisely set during vulcanization. Under-vulcanized products feature insufficient crosslinking and loose internal structure, which accelerate oxidation sharply under heating; over-vulcanized components become rigid and brittle and crack easily under alternating hot and cold conditions. Water-based release agents replace oil-based alternatives, for residual oily release agents penetrate rubber surface and damage polymer structure to cause swelling deterioration. Finished rubber plugs undergo natural aging placement after vulcanization to release internal molding stress. Residual internal stress triggers invisible microcracks under subsequent heat and compression, and cracks serve as channels for heat and air infiltration to accelerate local aging damage.
3. Standardized Warehouse Storage to Avoid Natural Aging at Static State
Unused rubber plugs deteriorate gradually under improper storage conditions. Finished products are packed into light-proof PE bags to block ultraviolet rays and air contact. Warehouse temperature is maintained between 20℃ and 25℃ with dry and ventilated surroundings, far away from acid-base chemicals, engine oil and volatile corrosive gas. Heavy stacking is prohibited because long-term continuous compression brings irreversible permanent compression set and permanent loss of original sealing elasticity. First-in-first-out inventory principle is enforced and maximum storage period is controlled within 12 months to reduce natural oxidation and hardening from long-term static placement. Scattered spare plugs are individually sealed and packed to minimize air exposure and oxidation.
4. Standardized Assembly Operation to Reduce Service Loss in Working Condition
Nonstandard assembly is a common inducement for premature aging of rubber plugs. Violent prying and forced installation are banned to prevent invisible microcracks on rubber body. Rubber plugs with matched specification are selected according to inner diameter of installation cavity: over-tight installation causes fatigue and embrittlement under persistent compression while loose assembly allows water and impurity penetration to corrode outer surface of plugs. Heat insulation gaskets are installed beside plugs on high-temperature equipment to avoid direct exposure to heat source. Pre-impregnation treatment against contacted coolant and electrolyte is conducted before assembly to improve anti-swelling capacity and retard deterioration induced by chemical corrosion.
5. Regular Inspection and Maintenance to Extend Actual Service Life
Daily maintenance during equipment operation effectively delays plug aging. Dirt, greasy dirt and corrosive residues attached on plug surface are cleaned periodically during routine inspection, as accumulated attachments erode rubber layer from outside to inside and lead to hardening and cracking. Exposed rubber plugs are covered for dust prevention during equipment shutdown maintenance to avoid long-term erosion from air and moisture. Regular accelerated aging tests are implemented on sampled in-service plugs to track performance attenuation and replace potential defective parts in advance. Selection criteria and maintenance cycle are optimized based on measured aging data to form closed-loop control and reduce aging deterioration rate continuously.
Comprehensive full-process control is core to delaying aging of high-temperature resistant rubber plugs. Step-by-step standardization from raw material formulation to finished product maintenance reduces cracking, swelling and hardening faults effectively, cuts maintenance cost caused by sealing failure and satisfies long-term continuous operation requirement of new energy and high-temperature industrial control equipment.
