Rubber wear resistance is a characterization of the resistance of rubber to surface friction, scraping or corrosive mechanical action and gradual loss, which is closely related to the service life of rubber products. EPDM itself has good wear resistance and can be used in the production of ordinary wear-resistant rubber products; As a low-cost option raw material for EPDM raw rubber, can EPDM recycled rubber be used in the production of EPDM wear-resistant rubber products? How to design the formulation of wear-resistant rubber products containing EPDM recycled rubber?
1. Design of vulcanization system for the production of wear-resistant rubber products with EPDM recycled rubber
(1) When EPDM recycled rubber is sulfur vulcanized, the accelerator M/TMTD and other combined sulfur can give EPDM recycled adhesive vulcanized rubber high tensile strength and tear resistance, which is suitable for medium and low hardness wear-resistant rubber products.
(2) The use of peroxide vulcanization EPDM recycled adhesive has the characteristics of small compression set, heat resistance, and excellent aging resistance, and the wear resistance is not as good as that of sulfur vulcanized rubber.
The vulcanization system is one of the key factors that determine the wear resistance of rubber. When producing wear-resistant rubber products, if there are certain requirements for the aging and compression set of the compound, sulfur and peroxide can be used together, and when the proportion of sulfur is 30%-50%, the wear resistance of the compound and the compression set can achieve the best balance.
2. Design of reinforcement filling system for the production of wear-resistant rubber products with EPDM recycled rubber
When using EPDM recycled rubber as the main raw material to produce wear-resistant rubber products, high wear-resistant carbon black has the characteristics of small particle size and high structure. silica can reduce the friction coefficient and improve the dynamic properties of vulcanized rubber; When used with coupling agents, the wear resistance of EPDM compounds can be increased by 15%-25%. Calcium carbonate and talcum powder E5LYY313 can improve dispersibility and reduce the amount of raw rubber. The combination of terracotta and carbon black can improve the extrusion process performance, especially for wear-resistant pipe rubber products produced by EPDM recycled rubber.
It should be noted that when using EPDM recycled rubber with peroxide vulcanization and using silica reinforcement, it is recommended to add 2-4 parts of ethylene glycol to adjust the pH value. Control the amount of fillers, such as calcium carbonate and talc, too much will affect the wear resistance of EPDM recycled adhesive vulcanized rubber.
3. Design of softening system for the production of wear-resistant rubber products by EPDM recycled rubber
EPDM compound has good compatibility with aromatic oil, too high dosage will reduce the wear resistance of the compound, it is recommended to control it below 15 parts, it is recommended to use paraffin hydrocarbon oil or naphthenic oil; Paraffin oil is suitable for peroxide vulcanization system, which can reduce friction and heat generation, and the dosage is among 10-20 parts.
When using EPDM recycled rubber to produce wear-resistant rubber products, rubber varieties, cross-linking density, cross-linking bond types, as well as the variety and amount of reinforcements, fillers, and softeners will affect the wear resistance of recycled rubber vulcanized rubber.
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