The main role of the automobile cooling system is to dissipate part of the heat absorbed by the heated parts in time to ensure that the engine works at the most suitable temperature.The cooling water hose is a flexible pipe connecting the automobile engine and the radiator.Its main function is to deliver coolant and dissipate heat to ensure the safety and normal operation of the engine.
At present, the working temperature of the domestic cooling water hose reaches 125℃, and it is produced by sulfur vulcanized EPDM rubber.The hose includes a three-layer structure: the inner layer (EPDM), the reinforcing layer and the outer layer (EPDM).
2. Automobile air conditioning hose
The inner rubber layer of the automobile air-conditioning hose is EPDM rubber, the reinforcing layer is polyester braided, and the outer rubber layer is EPDM rubber, which is extruded and coated.It has the advantages of low permeability and high temperature resistance.It can be used in an environment of -40～140℃, and even in a high temperature environment of 160℃.Automobile air conditioning hose is a kind of hose product with high technical requirements, and its key technical index is low permeability.
3. Automobile brake hose
In addition to the tolerance of brake fluid, automobile brake hoses must also have good aging resistance and moisture permeability.Previously, Styrene-butadiene rubber was the main material for the inner rubber layer of automobile brake hoses.Recently, due to the emergence of maintenance-free automobiles, the increase in the operating ambient temperature of brake fluid and the use of high-boiling brake fluid, EPDM or EPDM/butyl rubber has a tendency to replace SBR.
