Silica gel CAS 112926-00-8

CAS number：112926-00-8
molecular formula：O2Si
molecular weight：60.0800018310547
EINECS number：601-214-2

English synonyms

Silica gel GF Pre-coated Plate for TLC;High Silica gel HF254 Pre-coated Plate for TLC;Silica gel H Pre-coated Plate for TLC;AEROSIL(TM) 200;Silica gel G Pre-coated Plate for TLC;High Silica gel GF Pre-coated Plate for TLC;silica,amorphous,precipitatedandgel;silicagel,pptd.,cryst.-free

Related categories

Polymers and macromolecular organics; silica gel; resins and LC separation media; amino acids; biochemical reagents; molecular sieves, activated carbon, filter aids; silane reagents; Cn silicon compounds and silicates; inorganic chemical products; inorganic salts; Davisil SilicaEssential Chemicals;Silica TLC Adsorbent, with fluorescent indicator, no binder;Silica Gels;chemical reagents;organic chemical raw materials;refractory materials;auxiliaries;biochemical reagents-separation materials and consumables;chemical intermediates;auxiliaries;raw materials;biochemical reagents- Separation reagents;chemical products;chemical materials;Ocean brand column chromatography silica gel;chemical intermediates;inorganic chemical raw materials;general biochemical reagents;general biochemical reagents-biological separation reagents;other;UVCBs-inorganic;Adsorbents (Inorganic);LPLC Separation Media ;Silica;Davisil GradesResins&LC Separation Media;Davisil Silica;Essential Chemicals;Silica Gels;Silica TLC Adsorbent, no binder, no fluorescent indicator;Silica TLC Adsorbents;SilicaBulk Adsorbents for TLC;Fluka brand Silica, TLC AdsorbentBulk Adsorbents for TLC;Silica TLC Adsorbents , with binder, no indicator;Bulk Adsorbents for TLC;Other Silica Gels;Fluka brand Silica, TLC Adsorbent;Resins&LC Separation Media;metals scavenging agent;supported alkali metal;Desiccators and Desiccants;Desiccants;Labware

Introduction

Silicone gel is a kind of low cross-linking density silicone rubber without filler. Different from ordinary silicone rubber elastomers, silicone gel has a transparent or translucent gel-like appearance, very low mechanical strength, and its hardness is difficult to measure. Generally, its physical strength is characterized by penetration. In addition to the advantages of general silicone materials such as high and low temperature resistance, safety and non-toxicity, good biocompatibility, and good electrical insulation performance, silicone gel also has the properties of gel-like substances such as vibration absorption, adhesion, and sealing.

Chemical properties

Frosted glass-like translucent particles. Insoluble in water and inorganic acids, but soluble in hydrofluoric acid and concentrated caustic soda solution.

Use

• ●  Used as gas chromatography reagent, thin layer chromatography reagent and catalyst, also used for gas drying, gas absorption, liquid dehydration, etc.

• ●  For moisture-proof, rust-proof, gas dehydration, purification and catalyst carrier, it can also absorb harmful elements in water

• ●  Used as a humidity indicator to display the humidity saturation of the desiccant, the relative humidity of the packaging and precision instruments, and the space medium in the instrument

• ●  It is suitable for oxygen production, nitrogen production and natural gas dehumidification in chemical fertilizer, steel, natural gas and other industries as a dehumidifier. It is also used in military industry, ammunition, etc.

• ●  It is a good reinforcing agent for rubber, and its reinforcing performance is second only to carbon black. It is also used in lubricants, insulating materials, etc.

• ●  Mainly used for moisture absorption and rust prevention of instruments, meters, equipment, etc. under airtight conditions. At the same time, it can intuitively indicate the relative humidity of the environment through the transition of its own color from blue to red after moisture absorption. It can also be used in conjunction with ordinary desiccants to indicate the degree of moisture absorption of the desiccant and to judge the relative humidity of the environment.

• ●  Model I ultra-pure silica gel: used in the most commonly used normal phase chromatography packing, widely used in the purification of pharmaceutical intermediates and the extraction of natural products. Model II ultra-pure silica gel: used in sample pretreatment for pesticide residue detection in food, aroma detection in tobacco leaves, etc. Model III ultra-pure silica gel: applied to silica gel for ROHS testing. Model IV Ultrapure-18 Packing

• ●  Silica gel can be used as dehydrating agent and desiccant, catalyst carrier, coating binder, pulp treatment agent, refractory binder, etc.

• ●  It is used for processing high molecular protein in beer, regeneration of transformer oil and insulating oil, drying of gas and liquid, etc.

• ●  Used as anti-sticking agent for polypropylene and polyethylene films, thickening agent for high-build coatings and unsaturated resins, flattening agent for powder coatings and furniture paints, and anti-caking agent for powder materials

• ●  It is widely used as thickener and matting agent in coating industry, anti-sticking agent (opening agent) of plastic film (polypropylene, polyvinyl chloride, polyethylene), and is the main component of

• pre-coating liquid for drawing drawings and the anti-sticking agent of food and medicine. Caking agent and liquid carrier.

• Production method

●  Sulfuric acid method dilutes water glass and sulfuric acid to a certain concentration and conducts a neutralization reaction to form a hydrogel. After aging, washing, homogenizing with additives, spray drying, jet pulverization, and drying to obtain fine silica gas gel.

●  In the immersion method, the fine-pored spherical silica gel or fine-pored block silica gel, which has been removed from impurities, is subjected to moisture absorption of the silica gel by direct steam in a hygroscopic chamber. The indoor temperature is adjusted with a cold air pump, and the temperature of the upper layer of silica gel is controlled not to exceed 70 °C. After 30 hours, check whether the moisture absorption is complete (subject to not being fried in water). After the moisture absorption is complete, the material is stuffed for 8 hours, and then put in a dyeing device equipped with cobalt chloride and ammonium chloride. When dyeing, use 1L of dye liquor and 1.1 of dry glue. The ratio of kg is carried out, the soaking glue should be poured into one time and stirred quickly, keep the room temperature above 15 ℃, soaked for 6 to 12 hours, then dehydrated, and dried at 90 to 110 ℃ until the moisture content is ≤ 2%, and the blue glue is obtained by screening. Indicator and color-changing silica gel.