What is organic silicone and what is the difference from inorganic silicone? Silica gel can be generally divided into organic silica gel and inorganic silica gel according to its nature and composition. So what is the difference between organic silica gel and inorganic silica gel?
1. Organic silicone
Organic silicone is a special rubber in synthetic rubber, which is divided into solid and liquid according to the form. The liquid state is divided into room temperature vulcanization type and high temperature vulcanization type according to the vulcanization temperature. The basic structural unit of organic silica gel products is composed of silicon-oxygen links, and the side chain is connected to various other organic groups through silicon atoms. Therefore, the structure of silicone products contains both "organic groups" and "inorganic structures". This special composition and molecular structure make it combine the characteristics of organic matter with the function of inorganic matter.
Temperature resistance, weather resistance, electrical insulation performance, physiological inertia, low surface tension and low surface energy.
The use of silicone:
Silicone has these excellent properties, so it has a wide range of applications. It is not only used as a special material in aviation, cutting-edge technology, military technology departments, but also in various sectors of the national economy. Metal and paint, medicine and medical treatment, etc.
2. Inorganic silica gel
Inorganic silica gel chemical formula xSio2 · yH2O. The transparent or milky white granular solid is a highly active adsorbent material. It is usually an amorphous machine product made by reacting sodium silicate with sulfuric acid and undergoing a series of post-treatment processes such as aging and acid foaming. It is made of minerals existing in nature after washing and processing into granules or beads. The main component of inorganic silica gel is silica. It is an amorphous machine made of sodium silicate and sulfuric acid in silica. Finished product. Inorganic silica gel is washed or processed into minerals or beads by minerals present in nature.
The structure of inorganic silica gel is very much like a sponge. The interconnected small pores form a capillary pore adsorption system with a huge surface area, which can adsorb and store water vapor. Under the condition of 100% humidity, it can absorb and condense the water vapor equivalent to 40% of its own weight. It has high adsorption performance and can adsorb various substances. Add dilute sulfuric acid (or hydrochloric acid) to the aqueous solution of water glass and let it stand, it will become a hydrous silicic acid gel with solidification, thermal stability (the entry "thermal stability" is provided by the industry encyclopedia), good chemical properties , Has high mechanical strength, etc.
The selection range of inorganic silica gel for packaging materials is very wide, generally there are OPP / PE, PET / PE film, non-woven fabric, composite paper, etc. Used for gas drying, gas absorption, liquid dehydration, chromatographic analysis, etc. It is also used as a catalyst. If cobalt chloride is added, it will be blue when dry and red when it absorbs water.