The specific gravity (density) of liquid injection silicone is mainly related to the following factors:
Type and content of base polymer:
The base polymer of liquid injection silicone is its main component, and different types of polymers have different densities. Therefore, the choice of base polymer and its content will directly affect the specific gravity of silicone. For example, some high molecular weight polymers may have higher density, thereby increasing the specific gravity of silicone.
Type and amount of filler added:
Fillers are commonly used additives in liquid injection silicone to adjust the properties of silicone. The type of filler (such as white carbon black, diatomaceous earth, calcium carbonate, etc.) and the amount of addition will significantly affect the specific gravity of silicone. The addition of high-density fillers will increase the specific gravity of silicone, while the addition of low-density fillers will reduce the specific gravity.
Crosslinking density:
Liquid injection silicone will form a cross-linked structure during the vulcanization process, and the crosslinking density will also affect the specific gravity of silicone. Generally speaking, the higher the crosslinking density, the tighter the intermolecular bonding of silicone, which may lead to an increase in specific gravity. However, this effect is not linear, because the increase in crosslinking density may also change other physical properties of silicone.
Mixing and vulcanization process:
The temperature, time, mixing uniformity and other factors in the mixing process, as well as the temperature, time, pressure and other conditions in the vulcanization process, may have a certain effect on the specific gravity of silicone. These process parameters will affect the molecular structure and internal arrangement of silicone, thereby indirectly affecting its specific gravity.
Additives and auxiliaries:
Liquid injection silicone may also contain various additives and auxiliaries, such as catalysts, plasticizers, antioxidants, etc. The type and content of these additives may also have a certain effect on the specific gravity of silicone, although this effect is usually small.
In summary, the specific gravity of liquid injection silicone is affected by many factors, including the type and content of the base polymer, the type and amount of filler added, the crosslinking density, the mixing and vulcanization process, and additives and auxiliaries. In practical applications, it is necessary to select appropriate raw materials and production processes according to specific needs and conditions to obtain liquid injection silicone products with ideal specific gravity.