EPDM rubber is made by copolymerizing ethylene, propylene and non-conjugated diene as monomers. The main chain is composed of chemically stable saturated hydrocarbons. It has excellent aging resistance such as high and low temperature resistance, weather resistance, and ozone resistance. Ideal raw material for the production of circulating water pipes and connecting hoses for cooling systems. EPDM reclaimed rubber is processed from unvulcanized EPDM rubber or waste EPDM rubber products as raw materials. The product retains the basic performance characteristics of EPDM raw rubber and is low in price. It can be used with raw rubber to produce cooling The circulating water pipe of the system effectively reduces the cost of raw materials.
1. Ethylene propylene rubber/reclaimed rubber combined production cooling water pipe formula
Formulation 1: 100 parts of EPDM rubber, 10 parts of EPDM reclaimed rubber, 5 parts of zinc oxide, 7 parts of polyethylene glycol, 0.5 parts of stearic acid, 0.5 parts of antioxidant SP-C, and antioxidant D 2 Parts, fast pressing carbon black N550 50 parts, pyrolysis carbon black N990 50 parts, pottery clay 60 parts, plasticizer DOS 30 parts, coupling agent 10 parts, DCP 2 parts, crosslinking aid 1.8 parts; Total: 328.8 share.
Formulation 2: 100 parts of EPDM rubber, 30 parts of EPDM reclaimed rubber, 12 parts of zinc oxide, 2 parts of polyethylene glycol, 3 parts of stearic acid, 3 parts of antioxidant SP-C, and antioxidant D 0.5 Parts, fast pressing carbon black N550 120 parts, pyrolysis carbon black N990 10 parts, clay 20 parts, plasticizer DOS 60 parts, coupling agent 30 parts, DCP 5 parts, auxiliary crosslinking agent 0.5 parts; Total: 396 share.
2. Formula adjustment techniques for mixing EPDM reclaimed rubber in cooling water pipes
In actual production, with the continuous changes in the amount of EPDM reclaimed rubber, the amount of various compounding agents in the product formulation should be adjusted accordingly. In theory, for every additional 10 parts of EPDM reclaimed rubber 2YLYY1215, the amount of vulcanizing agent DCP (dicumyl peroxide) in the above formula should be increased by 1-2 parts, and the amount of coupling agent should be increased by about 10 parts. With the increase in the amount of EPDM reclaimed rubber, the amount of reinforcing agent in the formula-fast-pressing carbon black is appropriately increased, and the amount of pyrolysis carbon black and clay that mainly play a filling role is appropriately reduced. Appropriately increase the amount of plasticizer to improve the processing performance of EPDM/reclaimed rubber vulcanizate.
3. Advantages of EPDM cooling water pipe mixed with EPDM reclaimed rubber
In actual production, the cooling cycle system water pipes and connecting hoses produced with EPDM rubber as the main raw material are mixed with reclaimed rubber in an appropriate amount, which can not only reduce the cost of raw materials, but also improve the plasticity, fluidity and aging resistance of the rubber. Wait. From the perspective of the quality of the finished product, compared with the pure EPDM rubber cooling water pipe, the circulating water pipe of the cooling system with EPDM reclaimed rubber has better ozone resistance, low temperature bending resistance, electrical resistance, and compression permanent deformation. Low, low temperature compression permanent deformation, higher cold resistance coefficient, longer service life of water pipes.
When using EPDM reclaimed rubber to reduce the production cost of circulating water pipes and connecting hoses in the cooling system, rubber product manufacturers must choose the appropriate EPDM reclaimed rubber according to actual needs, reasonably control the amount of reclaimed rubber, and appropriately adjust the rubber product formula to ensure the product Reduce the cost of more raw materials under the premise of quality. Later, the editor will have the opportunity to continue to share with you the key points of the production process for the production of cooling water pipes from EPDM/reclaimed rubber.
Exclusive original article [commercial authorization] reprint, excerpt and excerpt in any form are prohibited without written authorization. Focus on Hongyun rubber: learn the process formula and raw material technology of producing rubber products from recycled rubber to help you reduce costs and increase profits