EPDM reclaimed rubber retains the basic performance characteristics of EPDM virgin rubber, and can replace high-priced EPDM virgin rubber with a suitable ratio to produce lower-cost electrical insulation products, which effectively enhances the product's market competitiveness. In actual production, the variety and amount of compounding agents in the vulcanization system, reinforcing filling system, softening system and protective system will affect the electrical insulation of electrical insulation products. The editor will continue to share with you how to design the formula to soften the system and the anti-aging system To improve the electrical insulation of EPDM reclaimed rubber products.
3. Softening system design
When using EPDM reclaimed rubber to produce high-voltage electrical insulation rubber products, the softener used not only requires heat resistance, but also ensures electrical insulation performance under high pressure; it is recommended to use low-viscosity polybutene oligomers and larger molecular weight Polyester plasticizer, has good heat resistance and certain resistance performance. When preparing electrical insulating rubber with low requirements for heat resistance, it is recommended to use high aromatic oil or naphthenic oil. The high aromatic oil contains a lot of benzene rings, which can effectively improve the breakdown voltage strength of the rubber. .
It should be noted that when polyester compounds are selected for direct steam vulcanization, they will cause hydrolysis, and the low-molecular-weight polar compounds generated at this time will cause the electrical insulation performance of the EPDM reclaimed rubber to decrease.
4. Anti-aging system design
When using EPDM reclaimed rubber to produce electrical insulating rubber products, especially high-voltage electrical insulating products, the products have high requirements on the high temperature resistance and ozone resistance of the rubber material. Choosing a suitable anti-aging system can effectively extend the service life of the product. Under normal circumstances, EPDM reclaimed rubber electrical insulation products can use amine antioxidants and p-phenylenediamine antioxidants, and proper addition of antiozonants can achieve better protection.
In actual production, the use of antioxidant H can reduce the generation of cracks in EPDM electrical insulation products, and the antioxidant AW can slow down the growth of cracks; physical protective agent-microcrystalline wax can isolate and protect ozone. It should be noted that: amine antioxidants interfere with peroxide vulcanization. The use of DCP vulcanized EPDM reclaimed rubber electrical insulation products should be used with caution; in addition, attention should be paid to the water absorption and purity of the antioxidants.
To improve the electrical insulation of EPDM reclaimed rubber electrical insulation rubber products, manufacturers must rationally design rubber product formulations, and comprehensively consider the effects of various matching systems on the electrical insulation, mechanical indicators, and heat resistance of EPDM electrical insulation products. While reducing costs, further optimize the use performance of electrical insulation products, and expand the application range of reclaimed rubber in electrical insulation rubber products.
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