Silicone rubber products can be divided into three categories according to the molding process

Molded silicone rubber products

Molded silicone rubber products are usually molded by high temperature mold in the addition of curing agent after the solid silicone rubber raw material through the curing machine to exert pressure, high temperature sulfur into solid molding, molded silicone rubber hardness is usually in 30°C-70°C. Raw materials with color paste according to pantone color card number color, mold shape determines the shape of molded silicone rubber products, molded silicone rubber products are the most widely used in the silicone rubber industry at present. Mainly used for making only silicone rubber industrial accessories, buttons, silicone rubber gifts, silicone rubber wristbands, silicone rubber watches, key bags, mobile phone cases, silicone rubber kitchenware, silicone rubber pad, ice lattice, cake mold and so on.

Extruded silicone rubber products

Extruded silicone rubber products are usually extruded silicone rubber molding by extrusion machine, generally extruded silicone rubber shape is long, tubular can be cut at will, but the shape of extruded silicone rubber has limitations, widely used in medical equipment, food machinery.

Liquid silicone rubber products

Liquid silicone rubber products are injection molded by silicone rubber, the product is soft, the hardness can reach 10°C-40°C, because of its soft characteristics, in the simulation of human organs, medical silicone rubber chest pad, etc., widely used.

Forming principle

The principle of molding is to use high temperature and high pressure (the mold temperature needs to be about 165℃), with a certain time, make the physical change of the product, that is, through the bridge of the bridging agent, make the original free molecules connect with each other, form a network structure, so as to be inseparable, and form the product we need. Forming sulfur is high temperature and high pressure sulfur type.

Hot vulcanization is usually carried out in two stages, pre-vulcanization is carried out under pressure, the temperature is 150 ~ 160℃; After vulcanization is to remove the peroxide, additive decomposition of volatile components, to be vulcanized in atmospheric pressure hot air (about 200℃) 1 ~ 4H (secondary vulcanization). In order to make vulcanization more stable and better physical properties, the time after vulcanization can be up to 12H or longer.

Forming of the main equipment

Molding equipment is mainly open smelting machine, cutting machine, hydraulic molding machine, sandblasting machine, punch, oven and so on.