Features

Secondary vulcanization is also called post-vulcanization or two-stage vulcanization, which refers to the process in which rubber and silicone products reach a certain degree of vulcanization, and the heat source is removed to continue heating and vulcanization. The role of two-stage vulcanization:

When the silicone rubber is vulcanized by peroxide, after the decomposition of the peroxide initiates the polymer reaction, low molecular weight compounds (such as benzene and benzoic acid) are formed in the rubber, which will affect the mechanical properties of the rubber. Moreover, the silicone rubber is in the first stage. After heating and forming, its crosslinking density is not enough, to make it react further, it is necessary to increase the time or increase the temperature, which occupies the time of the mold and the vulcanizer and affects the efficiency.

In order to meet the requirements of further cross-linking, the secondary vulcanization hot air oven produced by our company has helped many rubber and silicone companies to solve the problem of insufficient supply of secondary vulcanization heat energy and fresh air. This secondary vulcanization oven is currently used in many silica gels. It has received unanimous praise among the similar production enterprises, and the products after secondary vulcanization by oven heating have reached the EU national standards.