Electrochemical corrosion resistant inner ply compound formula

Abstract

The invention relates to an inner hose formula for an electrochemical corrosion resistant hose, which comprises the following compositions in portion by weight: 30 to 70 portions of low-mooney ethylene propylene diene rubber, 70 to 30 portions of high-mooney ethylene propylene diene rubber, 60 to 80 portions of semi-reinforcing carbon black, 60 to 90 portions of silica fume, 1.2 to 1.8 portions of bi-thiuram tetrasulfide, 1.7 to 2.3 portions of zinc dibutyl dithiocarbamate, 0.5 to 0.8 portion of tetramethyl thiuram disulfide, 3 to 5 portions of zinc oxide, 1 to 3 portions of polyethylene glycol, 1.5 to 2.0 portions of morphine disulfide, 0.3 to 0.6 portion of sulfur, 50 to 60 portions of paraffin oil, 1 to 3 portions of stearic acid and 2 to 4 portions of 2, 2, 4-trimethyl-1, 2-biquionlyl dihydride polymers. Compared with the prior product, the inner hose formula for the electrochemical corrosion resistant hose has obvious differences; the tensile strength is 12.0 MPa; the volume resistivity is 1X10<12> omega.cm and 1X10<5> omega.cm higher than that of the prior product; the service life of the electrochemical corrosion resistant hose is greatly improved; and the inner hose formula for the electrochemical corrosion resistant hose can well meet the demands of heat resistance and electrochemical corrosion resistance of a radiator hose of a motor vehicle.

Description

technical field [0001] The invention relates to the technical field of rubber hoses, in particular to an inner glue formula of electrochemical corrosion-resistant rubber hoses. Background technique [0002] Electrochemical corrosion resistant rubber hose mainly refers to the radiator rubber hose used in automobiles. The rubber hose is composed of outer layer rubber, fiber reinforced layer and inner layer rubber. The material is ethylene propylene diene monomer (EPDM for short). The radiator hose of the car works in the hot coolant, that is, the water / ethylene glycol mixture. Usually, the inner wall of the hose is prone to generate sediment to block the capillary pipe of the engine, so that the coolant cannot circulate normally, and it will also cause the hose to crack and cause early damage. , these are caused by electrochemical corrosion. According to the simulated electrochemical test, the electrical conductivity of the material is the main factor affecting the electroche...

AI Technical Summary

Problems solved by technology

At present, the inner rubber of a better rubber hose used in China has a volume resistivity of 1×10 7 Ω.cm, which can only meet the electrochemical corrosion resistance requirements of automobile radiator hoses below 125°C. As the temperature in the cabin of automobile engines becomes higher and higher, it is generally 125°C to 150°C and can reach 175°C. ℃, so in order to improve the electrochemical corrosion resistance of the automobile radiator hose, that is, the volume resistivity of the inner rubber still needs to be further improved