Silicone foam, also known as addition-type silica gel, is a porous rubber structure that is produced by foaming based on silicone rubber.
With the continuous development and updating of foaming technology, Nanfang rubber, plastic and silicone foam products, as environmental protection materials, are also used in more and more extensive fields due to their superior characteristics, such as sealing strips, buffer pads, construction gaskets, and vibration isolation materials. , protective equipment, etc.
The principle of silicone foam
The principle of foamed silicone rubber is to add a foaming agent to the selected silicone rubber material, heat and vulcanize it under pressure to make the silicone rubber foam, and the rubber material expands to form a sponge-like cell structure.
The factors that determine and affect the cell structure mainly include the gas generation amount of the foaming agent, the diffusion rate of the gas in the rubber compound, the viscosity of the rubber compound, and the vulcanization speed. In order to make better silicone foam products, the key is to choose the type of foaming agent and the rubber vulcanization system.
Silicone foam production process
Silicone foaming needs to go through a series of production processes and processing techniques, and each link will affect the finished product of silicone foaming.
1. Plasticizing
The essence of raw rubber mastication is to break and destroy the macromolecular chain of rubber, improve the plasticity of rubber, and make the mixing and kneading of compounding ingredients easier. When making foamed rubber products, the raw rubber is fully masticated, which will make the plasticity of the rubber better, and make it easier to produce products with uniform cells, low density, and low shrinkage.
2. Parking
After the rubber is mixed, it must be left for an appropriate time to allow various additives to be fully dispersed in the rubber mix. The more uniformly the rubber additives are dispersed, the more stable the size of the product, the smoothness of the surface, and the uniformity of the bubbles. good.
3. Temperature
Rubber foaming is very sensitive to temperature. The foaming effect of the same rubber material is different at different temperatures, because the foaming system and the vulcanization system are different in sensitivity to temperature, the system changes, the matching degree is different, and the effect is also different. different.
4. Forming
The subsequent processing and molding methods of foam rubber products include extrusion molding, compression molding, flat molding, etc. According to the structure, specification, length, size, shape, hardness, and color of the required finished product, as well as the special requirements of the drawings, non- Mark personalized customization.
Use characteristics of silicone foam
Silica gel is a kind of special rubber with good comprehensive performance, which ensures that silica gel foam has many excellent characteristics.
1. Stable chemical properties, excellent high and low temperature resistance, aging resistance, weather resistance, ozone resistance, and can work in air or oil medium at a temperature of -60°C~+250°C.
2. High air permeability, high ductility, certain tensile strength, strong sealing ability, airtight and watertight, can effectively block tiny particles, rainwater, dust, etc.
3. With good mechanical properties, it can be punched into various sealing gaskets and backing plates with strict requirements, which can act as a buffer and can be used for vibration isolation in electronic equipment and vehicles.
4. Good electrical insulation performance. When exposed to water and damp or the temperature rises, the change is small. Even if the silicon dioxide generated by short-circuit combustion is still an insulator, the equipment can continue to work. Therefore, it is also suitable for making wires, cables, lead wires, etc. .
Excellent characteristics also make silicone foam products widely used in electronics, automobile aviation, building doors and windows, home appliances, medical food hygiene, kitchen supplies, household miscellaneous products, hot stamping, mechanical equipment body, fax machine and printer Equipment fields such as high temperature components.
About silicone foam, please check the details:
https://www.siliconefoam.net/product-iota-f663a,b-liquid-silicone-rubber-foam-.html
