Automotive air conditioning hoses are mainly used to connect various components and transport refrigerants, and are important components in automotive air conditioning systems. EPDM has excellent ozone resistance, weather resistance, heat resistance, and chemical stability, making it an ideal raw material for the production of automotive air conditioning hoses. However, the price of EPDM on the market is very high, can some recycled rubber be mixed in the production of automotive air conditioning hoses? Which recycled rubber can be used in conjunction with EPDM to produce automotive air conditioning hoses?
1. EPDM recycled glue
EPDM recycled rubber retains the basic performance characteristics of EPDM rubber, high and low temperature resistance, excellent aging resistance, and the price is much lower than EPDM rubber, which can replace some EPDM rubber to produce automobile air conditioning hoses, especially the outer layer and inner layer of glue, effectively reducing production costs. 20-30 parts of EPDM recycled rubber can be mixed with 100 parts of EPDM rubber, and the rubber vulcanized by peroxide vulcanization system has better heat resistance.
2. Butyl recycled glue
Butyl recycled rubber has the basic properties of butyl rubber, good air tightness, heat resistance, and chemical corrosion resistance. Butyl recycled rubber has good compatibility with EPDM rubber, and can be used with EPDM rubber in an appropriate ratio to produce the inner and outer layers of automobile air conditioning hoses, reducing costs and improving the processability and finished air tightness and aging resistance of EPDM air conditioning hoses. When EPDM and butyl recycled rubber are used together in a ratio of 80:20, the physical and mechanical properties of vulcanized rubber for automobile air conditioning hoses are better.
3. Neoprene recycled glue
Neoprene recycled rubber is mostly processed from cable sheaths as the main raw material, with good heat resistance, weather resistance, ozone resistance, oil resistance and chemical corrosion resistance, etc., excellent bonding performance, can be used in conjunction with EPDM rubber E5LYY415 to produce automotive air conditioning hoses, further improve the corrosion resistance of finished products. When EPDM and neoprene recycled rubber are used together to produce automotive air conditioning hoses, attention should be paid to the proportion of recycled rubber mixing, the selection of vulcanization system and the use of other compounds.
4. EPDM/recycled rubber is used to produce vulcanized formulas for automobile air conditioning hoses
(1) EPDM rubber/EPDM recycled rubber is used to produce the outer layer of automobile air conditioning hoses
EPDM 70 parts, EPDM recycled rubber 30 parts, zinc oxide 5 parts, stearic acid 2 parts, anti-aging agent AP 2 parts, carbon black N550 110 parts, carbon black N990 170 parts, naphthenic oil 105 parts, plasticizer 5 parts, accelerator PZ 3 parts, accelerator BZ 3 parts, accelerator TMTD 1.8 parts, accelerator TETD 1.2 parts, vulcanizing agent DTDM 2 parts, sulfur 0.5 parts; Total 510.5 copies.
(2) EPDM/butyl recycled rubber is used to produce the outer adhesive formula of automobile air conditioning hoses
80 parts of EPDM rubber, 20 parts of butyl recycled rubber, 9 parts of zinc oxide, 1 part of stearic acid, 20 parts of carbon black N330, 60 parts of carbon black N550, 30 parts of naphthenic oil, 30 parts of calcium carbonate, 30 parts of terracotta, 5 parts of magnesium oxide, 0.5 parts of accelerator TT, 1.5 parts of accelerator DTDM, 1.5 parts of accelerator CZ, 0.8 parts of sulfur, 5 parts of DCP, 7 parts of crosslinker TAIC; A total of 301.3 copies.
(3) EPDM/neoprene recycled rubber is used to produce the outer layer of automobile air conditioning hoses
80 parts of EPDM rubber, 20 parts of neoprene recycled rubber, 4 parts of magnesium oxide, 0.5 parts of stearic acid, 45 parts of carbon black N550, 40 parts of carbon black N772, 40 parts of naphthenic oil, 5 parts of activated zinc oxide, 0.35 parts of accelerator NA-22, 0.8 parts of accelerator M, 0.5 parts of accelerator TMTD, 1.35 parts of accelerator TP/S, 1 part of sulfur; Total 238.5 copies.
When using EPDM as the main raw material to produce automotive air conditioning hoses, you can choose suitable varieties of recycled rubber according to actual needs, including EPDM recycled rubber, butyl recycled rubber, neoprene recycled rubber, etc., it is recommended to choose high-fineness, impurity-free recycled rubber products, reasonably determine the mixing ratio of recycled glue and appropriately adjust the formula and production process parameters, reduce raw material costs and save labor and electricity costs under the premise of ensuring the performance and quality of air conditioning hoses.
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