What are the production processes of silica gel

Silicone products are one of the items that can be seen everywhere in our daily life. Do you know what are the production processes of silicone? Here are six processes for silicone products

1. Molded

Compression molding, this manufacturing process is the most common. silicone compression molding，It mainly depends on the coordination of the mold, and the shape of the mold determines the shape of the silicone product. Compression molding silicone products are usually made by adding curing agent silicone raw materials, and applying pressure and high temperature sulfur to solid molding through a vulcanizer. The hardness of the molded silicone products is usually 30°C-70°C. The process is relatively simple. Suitable for all silicone products.

2. Injection

This is a high-quality requirement, a combination of liquid silicone and plastic.

Its products have good thermal stability, cold resistance, excellent electrical insulation properties, and will not produce toxic substances when burned.

Therefore, it has become an irreplaceable material in the production and design of medical supplies, automobiles, baby supplies, medical supplies, diving supplies, kitchen utensils and seals.

Three. Squeeze

Extrusion molding, extrusion Guangdong silicone rubber products are usually molded by a silicone extruder. Generally, the extruded silicone rubber has a longer shape and can be cut at will. The extrusion process is relatively simple, and most of them are strips. Silicone tubes are widely used in the fields of medical and mechanical equipment, and can also be used as buffers in packaging.

Four. Calendering

The silicone rubber is kneaded, mixed with white carbon black, silicone oil, etc. to make a mixed rubber, and then rolled out with a calender.

The longitudinal and transverse physical and mechanical properties of the film prepared by the calendering method are obviously different, which is the calendering effect. Specifically, the longitudinal tensile strength of the film is greater than the transverse direction, the transverse elongation at break of the film is greater than the longitudinal direction, and the longitudinal shrinkage of the film is greater than the transverse direction.

The calendering effect is the result of the orientation of macromolecules, needle-like and flake-like compounds along the calendering direction during the calendering process. The calendering effect is related to the composition of the compound, calendering temperature, speed ratio and other factors.

Used for larger products, such as silicon wafers, silicon rubber sheets, etc.

Five. Perfusion

Filling or pouring mold operation method: pouring mold or pouring mold is used for relatively smooth or simple products. There is no mold line to save manpower and time, that is, the product or model you want to copy is surrounded by rubber plates or glass plates, through a vacuum pump The silica gel is poured directly into the product. After the silica gel is dried and molded, the product is taken out to form a mold (Note: The infusion mold is generally made of soft silica gel, so that it is easier to demold and will not damage the product in the silicone mold). It is a solid-liquid combination and uses products such as mobile phone sets and luggage sets.

Six. Coating

Fast curing; strong adhesion; good fluidity, easy to defoam. The platinum complex catalyst is non-toxic and tasteless, and has good air permeability, heat resistance and certain tensile strength after molding (use temperature -60℃～200℃).

Excellent non-slip performance; no pollution; low hardness; strong adhesion. High tearability; high transparency; good tensile properties. Abrasion resistance, washing resistance, high temperature resistance; high three-dimensional, smooth, soft and good elasticity. Resistant to water washing and dry cleaning.

Suitable for fabrics, with anti-aging effects, such as silicone gloves, rain boots, etc.

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