Silicone rubber has relatively low viscosity and fast vulcanization speed, which makes it very suitable for injection molding process. Although the preformed silica gel can also be well transported through the screw, the use of barrel can ensure a stable conveying speed and reduce the risk of manual treatment of unvulcanized silica gel. According to the size of parts, the injection molding cycle is usually 0.5-3 minutes. Due to the high injection pressure, the linear shrinkage of injection molding is smaller than that of other molding processes. The reasonable design of glue injection port and exhaust port can avoid the introduction of air into the mold cavity.

Injection molded liquid silicone rubber

Product performance:

Liquid silicone rubber is a flexible thermosetting elastomer material with non toxicity, heat resistance and high recovery. LSR is a two-component liquid rapid vulcanization material with platinum as catalyst. It can be produced by injection molding, mass, rapid vulcanization and repetitive mechanization

Product purpose:

Liquid injection molding silicone is mainly used in the production, design and application of health products, automobiles, baby products, medical supplies, kitchen appliances, seals and special-purpose products.

Features of injection molded silica gel products:

(1) Achieve environmental FDA level certification;

(2) High temperature resistance, acid and alkali resistance, low shrinkage;

(3) Two component liquid silica gel shall be applied in equal proportion of 1:1;

(4) The soft hardness can be adjusted according to the performance requirements of the product;

Product forming process:

LSR is a two-component liquid material, which is divided into component A and component B. the work of the mixer (injection molding machine) fully mixes component A and component B in an accurate ratio of 1:1. In addition, due to the needs of product design, it will be equipped with the operation of color pump and color metering part. Components a + B, color, etc. are fully mixed and then enter the plasticizing system. The plasticizing screw has the functions of homogenization and mixing at the same time. The mixture is injected into the mold at high temperature (170-200 ℃) through the screw, and the silica gel solidifies. When the product reaches the cold flow system, it should be noted that the flow channel should be cold enough. In order to avoid glue leakage, the needle valve is installed on the surface of the die parts. When the glue injection is completed, the needle valve immediately closes the glue nozzle. Product molding.