Because of its good properties, silica gel products have begun to be used in more and more fields. It is precisely because of the non-toxic, odorless, and high-temperature resistant properties of silica gel that determine its field of use. And different silicone products are different in the production process, can not be confused. Silicone products molding process there are several? Can you introduce it in detail? Yes!
1, molding, that is molded. This kind of production process is the most common and is mainly completed by the mold. The shape of the mold determines the shape of the silicone product. Molded silica gel products are usually pressed through a vulcanizing machine after the solid silica gel raw material containing the vulcanizing agent is placed in a high-temperature mold, and high-temperature sulfur is formed into a solid. The hardness of the molded silica gel is usually from 30°C to 70°C. The production process is relatively simple and suitable for all silicone products.
2, injection, injection process. This process is a relatively high quality requirement and is a combination of liquid silicone and plastic. Its products are characterized by good thermal stability, cold resistance, excellent electrical insulation properties, and no toxic substances are generated during combustion. Therefore, it is used in the production design of health products, automobiles, baby products, medical products, diving products, kitchen utensils, and seals.
3, extrusion, extrusion molding. Extruded silica gel products are usually extruded through an extrusion machine and extruded into silicone. Generally, the shape of the extruded silicone is long, and the tubular shape can be cut at will. The shape of the products made by the extrusion art is relatively single, mostly in the form of strips. Silicone tubes are widely used in medical and mechanical equipment. It can also be used as a buffer in package materials.
4, rolling. Silicone rubber is mixed with white carbon black, silicone oil and kneading to form a compounded rubber, and then the sheet is rolled out. Films produced by calendering have markedly different physical and mechanical properties in the longitudinal and transverse directions. This phenomenon is a calendering effect. Specifically, the longitudinal tensile strength of the film is greater than the transverse direction, and the transverse tear elongation of the film is greater than the longitudinal direction, and the longitudinal shrinkage of the film is greater than the transverse direction. The calendering effect is the result of orientation of the macromolecules in the rubber compound and the acicular and platy compounding agents in the calendering direction during the calendering process. The size of the calendering effect is related to the composition of the rubber compound, the calendering temperature, the speed, and the speed ratio. For larger silicone products, such as silica gel tablets, silica gel plates.
5. Perfusion, ie, the method of operation of the irrigation or perfusion mold. Filling or pouring molds are used for smooth or simple products. If there is no mold line saving time and labor, it is to copy the product or model you want to copy, use a plastic plate or glass plate, and vacuum the silicone. Pour directly into the product, after the silica gel is dried and molded, remove the product and the mold is formed. (Note: The injection mold is generally made of soft silica gel to make the mold, so that the mold release is easy and will not damage the product inside the silicone mold) . It belongs to the combination of solid and liquid. Common items include mobile phone cases, luggage covers, etc.
6, coating, rapid curing. Strong adhesion, good fluidity, easy deaeration. Catalyzed by platinum complex, non-toxic, no odor; excellent thermal stability and cold resistance (usage temperature -60°C～200°C) has good air permeability, heat resistance, certain tensile strength, anti-slip property after molding Excellent performance, no pollution; low hardness, firm adhesive bonding. High tear strength, high transparency, good tensile properties. Wear-resistant and washable, high temperature resistance, excellent flexibility, good elasticity, washable and dry cleaning. Applied to cloth, it has anti-aging effect. Common silicone products are silicone gloves, rain boots and so on.