Chemical formula xSio 2? YH2O. Transparent or milky granular solid. It has an open porous structure and strong adsorption capacity, and can adsorb a variety of substances. Dilute sulfuric acid (or hydrochloric acid) is added to the aqueous solution of sodium silicate and allowed to stand, so that it becomes an aqueous silicic acid gel and becomes a solid. The electrolyte Na+ and SO4 2-( Cl-) ions dissolved in it were removed by washing with water, and the silica gel was obtained after drying. If it absorbs water, the moisture absorption rate of some silica gels is about 40% or even 300%. Used for gas drying, gas absorption, liquid dehydration, chromatographic analysis, etc. , also used as catalyst. If cobalt chloride is added, it will be blue after drying and red after absorbing water. Renewable and reusable.
safety performance
The main component of silica gel is silica, which is chemically stable and does not burn. Silica gel is an amorphous silica, and the dust content in the workshop should be controlled at no more than 10 mg/m3. Strengthen ventilation and wear a mask when operating.
Silica gel has strong adsorption capacity and can dry human skin. Therefore, work clothes should be worn when operating. If silica gel enters the eyes, it should be washed with plenty of water and treated by a doctor as soon as possible.
Blue silica gel contains a small amount of cobalt chloride, which is potentially toxic. Avoid contact with food and inhalation. In case of poisoning, you should seek medical attention immediately.
Silica gel can be reused after regeneration because it absorbs water vapor or other organic substances in the medium.
Safety terms: S22 Do not inhale dust. Don't inhale dust.
Classification of silica gel
Generally speaking, silica gel can be divided into organic silica gel and inorganic silica gel according to its nature and composition.
Inorganic silica gel is a highly active adsorption material, which is usually prepared by a series of post-treatment processes such as reaction of sodium silicate with sulfuric acid, aging, acid bubble and so on. Silica gel is an amorphous substance with the chemical molecular formula of msio2.nh2o. It is insoluble in water and any solvent, non-toxic, tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Due to different manufacturing methods, various types of silica gel have different microporous structures. The chemical composition and physical structure of silica gel determine that it has many irreplaceable characteristics: high adsorption performance, good thermal stability, stable chemical properties and high mechanical strength. It is used as desiccant, humidity regulator, deodorant, etc. At home; Industrially used as petroleum hydrocarbon decolorizer, catalyst carrier, pressure swing adsorbent, etc. Fine chemical separation and purification agent, beer stabilizer, coating thickener, toothpaste friction agent, matting agent, etc.
Silica gel is a kind of organosilicon compound, which refers to a compound containing Si-C bond and at least one organic group directly connected with silicon atom. Traditionally, those compounds that connect organic groups with silicon atoms through oxygen, sulfur, nitrogen, etc. Also known as organosilicon compounds. Among them, polysiloxane with siloxane bond (-Si-O-Si-) as the skeleton is the most widely studied and applied organosilicon compound, accounting for more than 90% of the total dosage.
The extrusion of silicone is more common, such as the sealing ring on the household rice cooker, which is called the silicone sealing ring of the rice cooker.
Molded silicone is a little more complicated and irregular in shape, including silicone bowls, silicone ice cubes, silicone cake molds and so on.
Regeneration of silica gel
First, the regeneration of silica gel after water absorption.
After silica gel absorbs water, it can be removed by thermal desorption. There are many heating methods, such as electric heating furnace, flue waste heat heating and hot air drying. The temperature for removing additional heat should be controlled at 120- 180℃, and the blue gel indicator, color-changing silica gel and blue silica gel should be controlled at 100- 120℃. The maximum temperature during the regeneration of various industrial silica gels shall not exceed the following limits:
Coarse pore silica gel shall not be higher than 600℃;
Fine pore silica gel shall not be higher than 200℃;
Blue gel indicator (or color-changing silica gel) shall not be higher than120℃;
Silicone-aluminum adhesive shall not be higher than 350℃.
After regeneration ... >>
Question 2: What does the silicone pad mean? Silicone breast augmentation
Question 3: What is silica gel in short? Silicon dioxide alias: Silicone rubber is a kind of high-activity adsorption material, which belongs to amorphous substance, and its chemical molecular formula is mSiO2? Nitrous oxide. Insoluble in water and any solvent, non-toxic, tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Due to different manufacturing methods, various types of silica gel have different microporous structures. The chemical composition and physical structure of silica gel determine that it has many irreplaceable characteristics: high adsorption performance, good thermal stability, stable chemical properties and high mechanical strength. Silica gel is divided into macroporous silica gel, coarse silica gel, B-type silica gel and fine silica gel according to pore size.
Question 4: What does it mean to be told by friends that there is silica gel on your face? This may mean that your face looks better, as if it had been repaired.
Question 5: What does silicone face mean? This means plastic surgery. Nowadays, many people do plastic surgery by punching holes.
Question 6: What does silica gel processing mean? Silica gel is a synthetic material in rubber materials, which can be divided into two categories: inorganic silica gel and organic silica gel, both of which can be used to process different products. Silica gel is now used in various industries. When you say silica gel processing, you should mean processing "silica gel" into different products, referred to as silica gel processing. For example, silicone products, silicone phone cases, silicone bracelets and so on. Secondly, silica gel belongs to non-toxic and tasteless items!
Question 7: What does silica gel mean? Silica gel (silica gel; Silica) alias: silica gel is a highly active adsorption material, which belongs to amorphous substances, and its chemical molecular formula is mSiO2? Except for strong alkali and hydrofluoric acid, nH2O does not react with any substance, is insoluble in water and any solvent, is nontoxic and tasteless, and has stable chemical properties. Due to different manufacturing methods, various types of silica gel have different microporous structures. The chemical composition and physical structure of silica gel determine that it has many irreplaceable characteristics: high adsorption performance, good thermal stability, stable chemical properties and high mechanical strength. Silica gel is divided into macroporous silica gel, coarse silica gel, B-type silica gel and fine silica gel according to pore size.
Chemical formula xSio 2? YH2O. Transparent or milky granular solid. It has an open porous structure and strong adsorption capacity, and can adsorb a variety of substances. Dilute sulfuric acid (or hydrochloric acid) is added to the aqueous solution of sodium silicate and allowed to stand, so that it becomes an aqueous silicic acid gel and becomes a solid. The electrolyte Na+ and SO4 2-( Cl-) ions dissolved in it were removed by washing with water, and the silica gel was obtained after drying. If it absorbs water, the moisture absorption rate of some silica gels is about 40% or even 300%. Used for gas drying, gas absorption, liquid dehydration, chromatographic analysis, etc. , also used as catalyst. If cobalt chloride is added, it will be blue after drying and red after absorbing water. Renewable and reusable.
safety performance
The main component of silica gel is silica, which is chemically stable and does not burn. Silica gel is an amorphous silica, and the dust content in the workshop should be controlled at no more than 10 mg/m3. Strengthen ventilation and wear a mask when operating.
Silica gel has strong adsorption capacity and can dry human skin. Therefore, work clothes should be worn when operating. If silica gel enters the eyes, it should be washed with plenty of water and treated by a doctor as soon as possible.
Blue silica gel contains a small amount of cobalt chloride, which is potentially toxic. Avoid contact with food and inhalation. In case of poisoning, you should seek medical attention immediately.
Silica gel can be reused after regeneration because it absorbs water vapor or other organic substances in the medium.
Safety terms: S22 Do not inhale dust. Don't inhale dust.
Classification of silica gel
Generally speaking, silica gel can be divided into organic silica gel and inorganic silica gel according to its nature and composition.
Inorganic silica gel is a highly active adsorption material, which is usually prepared by a series of post-treatment processes such as reaction of sodium silicate with sulfuric acid, aging, acid bubble and so on. Silica gel is an amorphous substance with the chemical molecular formula of msio2.nh2o. It is insoluble in water and any solvent, non-toxic, tasteless, chemically stable, and does not react with any substance except strong alkali and hydrofluoric acid. Due to different manufacturing methods, various types of silica gel have different microporous structures. The chemical composition and physical structure of silica gel determine that it has many irreplaceable characteristics: high adsorption performance, good thermal stability, stable chemical properties and high mechanical strength. It is used as desiccant, humidity regulator, deodorant, etc. At home; Industrially used as petroleum hydrocarbon decolorizer, catalyst carrier, pressure swing adsorbent, etc. Fine chemical separation and purification agent, beer stabilizer, coating thickener, toothpaste friction agent, matting agent, etc.
Silica gel is a kind of organosilicon compound, which refers to a compound containing Si-C bond and at least one organic group directly connected with silicon atom. Traditionally, those compounds that connect organic groups with silicon atoms through oxygen, sulfur, nitrogen, etc. Also known as organosilicon compounds. Among them, polysiloxane with siloxane bond (-Si-O-Si-) as the skeleton is the most widely studied and applied organosilicon compound, accounting for more than 90% of the total dosage.
The extrusion of silicone is more common, such as the sealing ring on the household rice cooker, which is called the silicone sealing ring of the rice cooker.
Molded silicone is a little more complicated and irregular in shape, including silicone bowls, silicone ice cubes, silicone cake molds and so on.
Regeneration of silica gel
First, the regeneration of silica gel after water absorption.
After silica gel absorbs water, it can be removed by thermal desorption. There are many heating methods, such as electric heating furnace, flue waste heat heating and hot air drying. The temperature for removing additional heat should be controlled at 120- 180℃, and the blue gel indicator, color-changing silica gel and blue silica gel should be controlled at 100- 120℃. The maximum temperature during the regeneration of various industrial silica gels shall not exceed the following limits:
Coarse pore silica gel shall not be higher than 600℃;
Fine pore silica gel shall not be higher than 200℃;
Blue gel indicator (or color-changing silica gel) shall not be higher than120℃;
Silicone-aluminum adhesive shall not be higher than 350℃.
After regeneration ... >>
Question 8: What does the silicone pad mean? Silicone breast augmentation
Question 9: What does the logo of silicone products mean? This should be the FDA's requirement for silicone. Because it is tableware, it must pass the food-grade environmental protection requirements and may be heated by microwave oven, so there will be requirements in terms of temperature resistance.
Question 10: What does the silicone model of socks mean? It means that silica gel is bonded to the surface of socks to play an anti-slip role. Especially for women's * * *, shiny silk cotton is smoother, skin is smoother, socks are easy to wear unsteadily, and anti-slip silicone comes in handy. Silica gel is a flexible non-slip material, which is soft and skin-friendly. The food is environmentally friendly and there is no discomfort in contact with the skin. It is very scientific to put it on socks.