Processing Technology of Silicone Rubber
Release time:
2025-05-12
Mixing: The raw rubber of silicone rubber is soft and has certain plasticity. It can be directly mixed with an open mixer or an internal mixer without plasticizing. Mixing methods include open mixer mixing and internal mixer mixing. After mixing, the compound shall be parked for not less than 24 hours and shall be remixed before use.
Mixing: The raw rubber of silicone rubber is soft and has certain plasticity. It can be directly mixed with an open mixer or an internal mixer without plasticizing. Mixing methods include open mixer mixing and internal mixer mixing. After mixing, the compound shall be parked for not less than 24 hours and shall be remixed before use.
Extrusion molding: the mixed silicone rubber raw materials into the hopper of the extruder, under the extrusion of the screw through the mold, extruded into a regular shape of the strip, tubular products, such as silicone tube, sealing strip and so on. Its advantages are high production efficiency and high dimensional accuracy, but its disadvantage is that the process is single and the mouth is limited.
Molding molding: the mixed silicone rubber raw materials into the mold, through the vulcanizing machine to apply pressure, high temperature vulcanization molding, suitable for high precision and quality requirements, complex shape of the sealing elements, such as sealing ring, rubber sleeve. The advantages are high dimensional accuracy and stable product quality, but the disadvantages are high mold accuracy requirements, slightly higher production costs, and lower production efficiency than extrusion molding.
Calendering molding: The mixed silicone rubber is pressed into a film with a certain thickness and width through a calender, which is suitable for manufacturing simple sheet and plate products, such as silicone gaskets, sealing rings, etc. The advantage is that it can produce large or small products, but the disadvantage is that the manufacturing cost is high, the batch requirement is large, and the process is more complicated.
Injection molding: Use an injection molding machine to inject the heated silicone rubber raw materials into the mold through a nozzle, and then cool and solidify. The product has high flexibility and excellent comfort, and is suitable for high-end products, such as baby bottles, teats, medical catheters, etc. The advantages are high production efficiency, high molding accuracy, and a certain degree of automation. The disadvantage is that the price of injection molding equipment is relatively high and the mold production cost is slightly expensive.
Glue: the silicone rubber paste with dipping or scraping method evenly distributed on the fabric, in order to improve the strength and flexibility of film products, so that the fabric moisture resistance, manufacturing high temperature resistant electrical insulation materials.
Vulcanization: divided into one vulcanization and two vulcanization. One-stage vulcanization is heated and shaped under pressure or atmospheric pressure; two-stage vulcanization is carried out at high temperature in an oven to further stabilize the physical properties of the vulcanizate.
Foaming: adding foaming agent in the silicone rubber compound, heating and vulcanizing under pressure to foam the rubber, making silicone rubber sponge. It is necessary to select the foaming agent whose decomposition products do not affect the heat resistance of silicone rubber, and properly control the amount of vulcanizing agent and foaming agent.
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