EPDM reclaimed rubber retains the basic performance characteristics of EPDM raw rubber, and can replace EPDM rubber to produce rubber products. Under the premise of ensuring product quality, it can effectively reduce the cost of raw materials and reduce the dependence on high-priced raw rubber. In actual production, EPDM reclaimed rubber and EPDM rubber can be used together in any ratio, and the type and amount of rubber additives in the formula can be adjusted appropriately to meet the physical requirements of various EPDM rubber products.
1. Reference formula for EPDM/reclaimed rubber combined use
70 parts of EPDM rubber, 30 parts of EPDM reclaimed rubber, 4 parts of zinc oxide, 4 parts of polyethylene glycol, 1.85 parts of stearic acid, 3.5 parts of coumarone, 1.5 parts of antioxidant RD, 140 parts of carbon black Parts, 60 parts of rubber oil, 4.9 parts of accelerator, 1.25 parts of sulfur; Total: 321 parts.
2. Selection skills of EPDM/reclaimed rubber additives
When using EPDM/reclaimed rubber to produce rubber products, a reasonable choice of rubber additives can further optimize product quality while reducing costs.
(1) Vulcanization cross-linking: EPDM/reclaimed rubber combined rubber mostly uses sulfur vulcanization system or peroxide vulcanization system. When using sulfur vulcanization system, it is recommended to use accelerator DM as the main accelerator, use accelerator BZ, accelerator CZ and a small amount of accelerator TT, add zinc oxide and stearic acid in an appropriate amount to activate the vulcanization system. When peroxide crosslinking is used, dicumyl peroxide is often used as a vulcanizing agent, and an appropriate amount of TAC, TAIC, TATM, etc. is used for activation.
(2) Reinforcement and filling: Choosing a suitable reinforcement and filling system can significantly improve the mechanical strength of EPDM/reclaimed rubber combined rubber. Carbon black is commonly used for reinforcement. Commonly used are carbon black N220, N330, N550, N774 and so on. Among them, N330 is a high wear-resistant carbon black, N550 is a fast-pressed furnace black, and N774 is a non-polluting high-constant elongation semi-reinforced furnace black; two or more carbon blacks can be used together to coordinate the relationship among various physical indicators. Improve the performance of rubber material.
(3) Softening and plasticizing
The use of rubber oil in the production of EPDM/reclaimed rubber products can significantly improve the processing performance of the rubber, increase the elasticity and flexibility of the rubber, etc., use more paraffin wax with better compatibility with the EPDM rubber 2YLYY113 Oil, naphthenic oil or aromatic oil, etc. Among them, naphthenic oil has excellent low-temperature performance and good color stability. When used as a softener to improve the process performance of EPDM/reclaimed rubber, it has better compatibility with EPDM rubber and can improve the tensile strength of the product to a certain extent. Indexes such as tear strength.
In actual production, when EPDM reclaimed rubber is used together with EPDM rubber to produce low-cost, cost-effective rubber products, manufacturers must choose the appropriate EPDM reclaimed rubber, and reasonably determine the ratio of reclaimed rubber and virgin rubber. , Appropriately adjust the rubber product formula to reduce more raw material costs under the premise of ensuring product quality.
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