Vulcanization is a complex vulcanization reaction process between rubber and crosslinking system auxiliaries, and temperature is a necessary condition for crosslinking. The vulcanization temperature is high, the vulcanization speed is fast, the production efficiency is high, on the contrary, the vulcanization speed is slow, the production efficiency is low; Vulcanization pressure is not a necessary condition for the vulcanization reaction, it is a necessary condition for the vulcanization of most rubber products, the role of pressure is mainly to make the rubber material in the mold cavity full of full flow, to exclude air, so that the rubber material dense, and temperature and time have no direct relationship.
Rubber vulcanization pressure is an important factor to ensure the geometric size, structural density, physical and mechanical properties of rubber parts, but also to ensure that the surface of the parts is smooth without defects, to meet the requirements of sealing and airtight products. Vulcanization pressure is not random, vulcanization pressure is too large in addition to damage the mold, equipment, power consumption, but also affect the performance of the product. Frame pieces can damage the frame. Small pressure will directly affect the geometric size of the product and physical and mechanical properties.
The purpose of rubber products requiring vulcanization pressure is generally considered to be:
(1) Prevent the formation of bubbles and improve the density of the rubber.
(2) Make the rubber material flow and fill the mold cavity.
(3) Improve adhesion and improve the physical properties of vulcanized rubber.