Silicone products are a kind of environmentally friendly, low-carbon and green products that are processed and molded from silica gel. The main processing technology includes injection molding, extrusion molding and compression molding. Silicone has irreplaceable superior properties of other soft rubbers, such as: good elasticity, waterproof and moisture resistance, corrosion resistance of acid, alkali and other chemical substances, does not contain any harmful substances, and is not easy to deform;

Silicone products are often used in high-demand areas of human contact, such as baby pacifiers, human organs, medical supplies, etc., and the application prospects are very broad. At the same time, silica gel is a non-petroleum product and does not depend on the increasingly scarce petroleum resources. Therefore, it is a general trend for silica gel products to become substitutes for similar rubber and plastic products. Among them, injection molding liquid silica gel can produce all high-temperature rubber products. The process is simple, Many advantages such as high product accuracy and large output will become a new trend of development in the next few years.

First, the advantages of liquid silicone

Advantage:
Non-toxic to human body, odorless and tasteless;
Good transparency, can be sterilized;

performance:
Good touch, elasticity and anti-aging properties;
Good high temperature resistance and thermal stability (continuous working temperature up to 180°C);
Good low temperature properties (still soft at -50°C);
Excellent electrical insulation, no harmful substances will be produced when burning

Three, mobile phone soft rubber sheath comparison - TPU and liquid silicone

Silicone sheath:
  Advantages: non-toxic to the human body, good buffering performance, high abrasion resistance, oil resistance, water resistance, good flexibility, comprehensive protection, and will not turn yellow. It can be applied to two-color overmolding molds and can be used to make waterproof sheaths.
  Inadequate: slightly poor fit with the body

TPU sheath:
  Advantages: high wear resistance, high strength, outstanding cold resistance, oil resistance, water resistance, mildew resistance, good flexibility
  Inadequate: easy to deform, easy to turn yellow

Fourth, the application case of liquid silicone in mobile phone waterproofing

The innovative application of liquid silica gel in mobile phone waterproof structural parts solves the problem of mobile phone water ingress. The injection molding method of metal + silica gel, plastic + silica gel, glass + silica gel and other secondary molding will become the new trend of mobile phone waterproof.

The advantages of two-color silicone injection waterproofing compared to traditional mobile phone waterproofing:
Due to the need for manual operation in the middle of traditional mobile phone waterproofing, such as gluing and bonding, ultrasonic welding, etc., the accuracy and stability of the assembly cannot be guaranteed, the disassembly and assembly are easily damaged, and the waterproof effect is poor. The liquid silicone injection molding waterproof structure is simplified, the overall structure is compact, the assembly accuracy and repeatability are high, the waterproof effect is improved, and the waterproof level is above level 5. The bonding strength of liquid silicone injection molding and secondary molding of metal, plastic and other materials is high, which can be disassembled and assembled many times, easy to replace and stable in waterproof performance.