??Aging and protection of Automotive Air Conditioning O-ring

??Automotive Air Conditioning O-ring aging occurrence and development, is a outside to the inside, from quantitative to qualitative change. Surface after aging spots, discoloration or loss of light micro-cracks, feel is soft sticky or hard brittle; the aging of certain physical and chemical properties and electrical properties of air conditioning O-rings deteriorate, the emergence of various mechanical properties varying degrees of decline, the longer the time the more significant changes in aging.

??Automotive Air Conditioning O-ring has internal causes of aging are also external, internal rubber belong to an organic polymer materials, chemical bond energy of the molecule, a crosslinked network of key energy and cohesive energy between molecules are relatively low, vulnerable to all kinds of erosion, destruction and aging. There are three types of external causes of aging, one physical factors such as heat, light, electricity, high-energy radiation and mechanical stress; the second is a chemical element, such as oxygen, ozone, strong oxidants, inorganic acids, alkalis, saline solution, and become divalent metal ion ; Third, biological factors, such as microbes and ants and so on. Rubber oxidation and ozonation reaction to the destruction caused by the most common rubber, but also the most serious. In addition to heat, light, mechanical stress and other factors often also play a junction oxidation and ozonation activation and / or catalysis.

??Aging protection in the automotive air conditioning O-rings, now has developed hundreds of different aging behavior can resist adding multi-functional or special antioxidant, some have been widely used in the production practice.