Liquid silicone rubber injection molding technology successfully developed in 1970s, ushered in a new era in the production of silicone rubber processing industry with high efficiency, high quality and low cost, compared with the traditional heat vulcanization technology, has the following advantages.
First, the viscosity of liquid silicone rubber is low, not only can be used to send, to achieve the measurement, mixing, injection molding process of continuous, automated, but also can form a variety of complex shape and structure of products.
Second, fast curing speed, can be completed within the 20-30s, the molding cycle is not more than 1min, both energy consumption and manpower, but also improve the production efficiency.
Third, the low pressure molding, accurate measurement, high precision mold products, no edges and defects, saving raw materials, are removed from the postprocessing procedure.
Fourth, the product performance can be comparable with thermal vulcanization rubber, while the production cost is reduced by 50%
Liquid injection molding of silicone rubber, usually in the form of double packaging to provide users with the use of A, B two groups according to the volume or quality can be mixed into the injection molding machine, in the heating and compression molding for products. In order to ensure the accuracy of measurement, the A and B components should be formulated so that the viscosity and relative density of the two groups are basically the same. Additional liquid silicone rubber for liquid injection molding, the vulcanization characteristics and vulcanizate physical properties and potting, fiber coating and chip contact coatings are quite different.
In recent years, with the deepening of reaction mechanism and silicone rubber reinforcing theory, through high reinforced white carbon black using surface water repellent treatment, reinforcing filler and high proportion, adopt concentrated crosslinking and chain extension technology, not only greatly improve the mechanical strength of molding liquid silicone rubber, to the mixing type of silicone rubber, but also developed a single component liquid silicone rubber injection molding. In addition, with the liquid injection molding machine performance and raise the level of automation, liquid silicone rubber injection molding is widely used in the preparation of light quality and output of the products, such as baby nipple shield, TV anode cap, rubber parts, automotive electronic and electrical appliances with rubber parts, rubber parts, silicone medical products and a variety of copier rollers sealing washer.