Crankcase ventilation rubber hose and machining method thereof

Abstract

The invention relates to a crankcase ventilation rubber hose and a machining method thereof. Raw materials include ethylene acrylate rubber, acrylic ester rubber, nitrile rubber, a reinforcing agent, a plasticizing agent, an interior parting agent, an age inhibitor, a vulcanizing agent and an accelerator; all the rubber and corresponding auxiliary materials are blended according to mass parts specified in a rubber formula; and the reinforcing agent and the plasticizing agent are automatically fed by an automatic pipeline conveying system. The rubber hose is produced by using a Banbury mixer through a two-stage rubber mixing process, so that a sizing material has a bright exterior after being mixed, and is mixed uniformly. A cold feed extruder is used for extruding finished hose blanks. A hose is required to be molded by first-stage and second-stage vulcanization. By using the machining method, an optimal material performance combination is obtained, comprehensive requirements on the using performance, the production cost and the like of a product are met, the FAM B oil resistance of the crankcase ventilation hose is prominent, the resistance to oil temperature is increased from 140 DEG C to 175 DEG C, the oil resistance is enhanced from 135 DEG C to 160 DEG C, and higher using requirements are met.

Description

technical field [0001] The invention relates to the technical field of rubber hoses, in particular to crankcase ventilation rubber hoses for automobiles and a processing method. Background technique [0002] When the car is running, the engine intake system is communicated with the crankcase through the PCV (Positive crankcase ventilation) valve and the crankcase ventilation pipe, and the exhaust gas in the crankcase is forcibly introduced into the combustion chamber by the vacuum of the engine intake system for combustion and fresh Air is sent into the crankcase, eliminating crankcase pollutant emissions. Under normal working conditions, 70% of these exhaust gases (blow-by gases) are unburned hydrocarbons (HC), which will dilute the deteriorated oil and corrode the engine parts. Especially at high speed, severe blow-by will cause oil shortage between piston ring and cylinder block. Since there will be some gasoline or diesel in the exhaust gas, it is necessary to choose a...

AI Technical Summary

Problems solved by technology

However, during the development process, the problem encountered is that the oil used for the resistance test of AEM rubber, that is, FAM B oil, is difficult to meet the following standards: resistance to FAM B oil, after aging at 23°C / 46h, the hardness changes from 0 to -17, and the tensile Tensile strength ≥ 5MPa, elongation at break ≥ 100%, the oil resistance of acrylic rubber (ACM rubber) is better than AEM rubber, but its aging performance is too low, the highest can only reach 160 degrees, at present, there are already domestic production The manufacturer uses AEM rubber and ACM rubber together to achieve the effect of complementary advantages. The resistance to FAM B oil has improved, but it still does not meet the standard requirements. Therefore, in order to pass this standard and get customer approval, the ratio of rubber main materials selection and corresponding formulation design is critical

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