How long does the two-stage vulcanization of silicone in the oven last

Widely used in industries such as electromechanical, chemical, plastic, light industry, and scientific research units for convenient heating such as secondary vulcanization of various products and experimental products. Not suitable for volatile substances to prevent explosions. The function of the secondary vulcanization furnace is to vulcanize silicone rubber products at high temperatures. The sulfides produced during the vulcanization process have a pungent odor. A top strong exhaust fan is used outside the workshop to avoid accumulation inside the box and the formation of crystals attached to the inner wall and sealing strip of the box.

post-curingbakeboxDuring the production process, silicone is taken out from the hydraulic press, which is called vulcanization. During the vulcanization process, the silicone gel matures, but the sulfurizing agent and release agent decomposition agent contained in the silicone gel are not completely discharged.

At this point, the silicone product needs to be baked in the oven. Generally speaking, tableware is at 200 degrees Celsius for 4 hours. According to different requirements, the temperature and time for secondary vulcanization also vary. Some industrial miscellaneous items do not require secondary vulcanization at all.

Secondary sulfides are also known as post sulfides. Commonly used for vulcanization of silicone rubber, fluororubber, and fluorosilicone rubber. Secondary vulcanization: When silicone rubber is vulcanized with peroxides, the decomposition of peroxides causes polymer reactions, producing low molecular weight compounds (such as benzene, benzoic acid, etc.) in the rubber. It will affect the mechanical properties of rubber. In addition, after the first stage of heating and forming, the cross-linking density of silicone rubber is insufficient. In order to improve the density of silicone rubber, further vulcanization reaction is required. Compared with one-time vulcanization, it improves tensile strength, elasticity, hardness, expansion degree, density, and thermal stability.

If secondary vulcanization is not carried out, the performance of silicone may be affected to a certain extent, making it impossible to obtain products with better performance. The parameters for primary vulcanization may differ from those for secondary vulcanization, which is related to the actual operation! There are various types of silicone sulfides, including high temperature and room temperature. Taking high-temperature silicone as an example. Before vulcanization, we usually refer to it as raw rubber. Blended rubber is made by adding many additives such as vulcanizing agents and release agents together with raw rubber. From the appearance, you can see. When you pull it with your hand, it will break and have no elasticity. If the mixed rubber is vulcanized and formed at a certain temperature, the product can be obtained.