What should we pay attention to in liquid silicone injection molding?

Differences between liquid silicone rubber and solid silicone rubber

Liquid silicone rubber is a kind of flexible thermosetting material, non-toxic, heat-resistant and high resilience. Compared with solid high-temperature vulcanized silicone rubber, it is a kind of liquid silicone rubber with good fluidity, fast vulcanization speed, more safety and more environmental protection, which can completely meet the requirements of food grade. In addition, the product of liquid silicone rubber is soft and its hardness can reach 10 ° C-40 ° C. Because of its soft characteristics, it is widely used in simulating human organs and medical silicone breast pads.

Liquid silicone rubber mold

LSR is a kind of double liquid rapid vulcanization material. With platinum as catalyst, it can be produced by injection molding, mass, rapid vulcanization and repeated machinery. Its products have good thermal stability, cold resistance, excellent electrical insulation performance, and will not produce toxic substances when burning. However, due to the high expansion coefficient of LSR, it will expand during heating and shrink slightly during cooling. Therefore, the part cannot maintain accurate side margins in the mold.

In addition, the solidified LSR is easy to stick to the metal surface. The more common demoulding technologies include thimble and air push. The liquid silicone rubber is divided into A glue and B glue. The ration device is used to control the ratio of 1:1. The liquid silicone rubber is injected into the hot channel mold for production. The silicone product can be manufactured without waste and automatically.