What is the vulcanization process of rubber vulcanization?

The vulcanization process can be divided into three stages. The first stage is the induction stage. In this stage, first of all, sulfur yellow, accelerator activator interaction, so that zinc oxide in the rubber material Solubility in the rubber material to increase, activate the accelerator, so that the reaction between the accelerator and sulfur yellow to generate - a more active intermediate product; and then further trigger the rubber molecular chain to produce Rubber molecular chain can be further triggered, resulting in crosslinked rubber macromolecule radicals (or ions). The second stage is the cross-linking reaction, that is, the cross-linking free radicals (or ions) and rubber molecular chain to produce "reaction to generate Cross-linking bond. The third stage is the network formation stage, the early part of this stage, the cross-linking reaction has been completed, the initial formation of cross-linking bond shortening, rearrangement and cleavage reaction, and finally the network tends to stabilize, and the network will be stabilized. Finally, the network tends to stabilize, obtaining a relatively stable network of vulcanized rubber. During the vulcanization process, various properties of rubber change with the vulcanization time. The change of a property of rubber and the vulcanization time for the curve graph, that is, the vulcanization process Figure. Natural rubber in the vulcanization process, tensile strength, resilience, elongation and swelling properties are in accordance with the emergence of large or small values of the kinetic curve and changes in the The As for styrene butadiene rubber with ethylene side groups, nitrile rubber, etc., there are similar changes in quality during vulcanization, but in the longer vulcanization time, the changes in the various properties are flatter, and the changes in the properties are more stable. Various properties of the change is relatively flat, the curve appears to be very large or very small value is not very obvious. Correctly grasp the law of change in the process of technology processing, scorched heat vulcanization vulcanization flat Frank! Over vulcanization to control the performance of rubber is very important.
In the vulcanization process, the rubber material of various performance changes in the turn of the vulcanization time between, mainly determined by the nature of the raw rubber, vulcanization conditions, with the agent. Vulcanization process diagram in particular It is the nature and amount of vulcanizing system compatibilizer. Therefore, the study of the vulcanization process for the study of vulcanizing compounds and the correct grasp of the formulation technology is extremely beneficial. Usually, the most common method is to use A physical property of the rubber with the vulcanization time change curve, to characterize the course of vulcanization and rubber properties of the law of change. With the tensile strength and vulcanization time change relationship Curve to describe the entire vulcanization process, so called vulcanization process diagram.