[VIP第1年] 指数:7
通过认证 As car engines become more compact and turbine engines become more popular, the external environment temperature of radiator pipes becomes higher and higher. The traditional outer material of water pipe, because its main material is EPDM, its main chain structure is vinyl and propylene group, side chain contains ENB group, which forms the outer material in reality through peroxide crosslinking agent or sulfur, accelerator and other ingredients vulcanization. This material in 150 ℃ hot air long been aging, ENB group will lead to the main chain of chemical bonds can abate the away chain rupture, and increase the reactivity, reflect on the outer layers of the concrete material is to increase the hard lot of hardness, elongation at failure to reduce a lot, break strength, reduce a lot, so that the materials in this environment; In addition, the traditional formula in compression permanent deformation, stretching, physical and mechanical properties, low temperature performance and resistance performance is difficult to achieve balance, this is because the formula design, the influence of these factors such as raw rubber ethylene content, crosslinking density, packing size, packing structure, mineral content, gel content, such as contradictory, requires precise design various types of ingredients and content; In addition, it is necessary to give consideration to the bonding degree of inner material and outer material as well as the mutual influence factors of inner and outer material performance, etc. It is also necessary to develop a more ideal heat-resistant aging heat sink pipe outer material.
