Secondary vulcanization, also known as post-vulcanization or two-stage vulcanization, refers to...Rubber ProductsA process of continuing to vulcanize after reaching a certain degree of sulfurization, even after removing the heat source. Broadly speaking, rubber products can continue to deepen the vulcanization process, even without further heating, due to the residual heat or during the storage process, or through dynamic action, resulting in continuous cross-linking phenomena.
Of course, this includes the continued use of the heating process for secondary sulfonation; the purpose of secondary sulfonation is to further cross-link rubber products, enhancing their mechanical properties and compression deformation characteristics; the methods for secondary sulfonation include oven hot air curing or using a curing pot for hot air secondary sulfonation; currently, many rubber sealing component or rubber product manufacturing units utilize secondary sulfonation technology to produce rubber sealing products. The technology is continuously evolving with the times, updating and being optimized!
SiliconeThe role of secondary vulcanization: When silicone rubber is vulcanized with peroxides, the decomposition of peroxides triggers a polymer reaction, resulting in the formation of low molecular compounds (such as benzene and benzoic acid) within the rubber that can affect its mechanical properties. Moreover, after stage heating and molding, the crosslinking density of silicone rubber is insufficient, and further vulcanization reactions are needed to increase its density. The tensile strength, resilience, hardness, swelling degree, density, and thermal stability are all significantly improved compared to primary vulcanization. Without secondary vulcanization, the performance of the produced silicone may be affected, and better-performing products may not be achieved.
Sulfurization parameters for the first and second stages may vary, which is related to actual operation! There are various types of silicone vulcanization, including high temperature and room temperature. Taking high-temperature silicone as an example, before vulcanization, it is what we commonly refer to as raw rubber. Mixed rubber is the result of blending many additives such as vulcanizing agents and release agents with the raw rubber. It can be easily identified by appearance. It breaks upon slight pulling and lacks elasticity. If the mixed rubber is vulcanized into a finished product at a specific temperature, you get items like silicone bottle sleeves, silicone wristbands, silicone bottle caps, silicone seals, silicone trays, silicone pads, and silicone phone cases, among others. Generally speaking, as long as the manufacturer is legitimate and uses qualified silicone raw materials, the silicone products produced are non-toxic.
Yongle Rubbers and PlasticsThe company has successfully passed the ISO9001 certification. We specialize in manufacturing platinum silicone tubes, peristaltic pump silicone tubes, food mold silicone molding parts and silicone, as well as custom production of sealing components for plastic products. With the competitive strategy of "aiming for better products, better services, and a better image," we continuously undergo transformation and management innovation to enhance our comprehensive corporate competitiveness.
