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The working principle and using method of silica gel desiccant

Source:silicone products http://www.ketaili.net | Time: 2015/4/28 19:47:03 | Visit: 1306 | More about 《FAQ

The working principle and using method of silica gel desiccant


Silica gel desiccant is a highly active adsorption material, usually is to use sodium silicate and sulfuric acid reaction, and the aging, acid soak and a series of post-processing process and system. Silica gel is amorphous material, its chemical formula is mSiO2. NH2o. Insoluble in water and any solvents, non-toxic tasteless, chemical properties not disorderly, in addition to the strong alkali, hydrofluoric acid does not react with any material. Chemical components and physical structure of the silica gel, determines it has many other features of similar materials difficult to replace: high adsorption function, hot not disorderly, chemical properties not disorderly, such as high mechanical strength. This product is moisture permeability small bags of different varieties of silica gel, the main raw material high silica gel is a kind of micro pore structure of hydrated silica, non-toxic, tasteless, odorless, chemical properties not disorderly, with a strong moisture absorption function. And therefore is widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, medicine and other relative humidity of the storage and transportation of control environment, to prevent the goods be affected with damp be affected with damp, mildew and rust. Its various technical indicators for packing desiccant and basis, repair maintenance methods are clearly defined. Consult our customer service staff for the scale. The function of the safety of silica gel: silicone has very strong adsorption capacity, drying effect on a person's skin, therefore, manipulation should wear good clothes. If silica gel into the eyes, need a lot of water erosion, and find a doctor as soon as possible. type


Wrapping active desiccant, according to its USES are divided into the following several types: type 1, 2, general purpose no dust type 3, specific use (more than 400 grams) particle size


Size: 1-3 mm or 2-5 mm silica gel desiccant - related quality indicators


Quality indicators meet GB10455-89 (or the user agreement)


Unit adsorption capacity, adsorption amount of RH = 20% when 10% RH = 40% or higher acuity 20% RH = 90% when 30% or higher


Note: according to scale: GB10455-89 in RH = 90% qualified products 28% or higher grade a classy article or 29% to 30% or higher packaging specifications


Commonly used specifications shown in the following table (agreed) special specifications can be packing


Lined with plastic sheets, external use corrugated carton, each package comes with a humidity indicator CARDS (RH10 % + / - 5%) instructions (generally use at least amount) note: at least usage refers to the use of in welding sealing iron container, whatever in damp environment and use wooden case lined with plastic bag packaging packaging, should use double the amount of 1, pores, silica gel desiccant:


The appearance of the product is white, translucent vitreous body. Mainly used for drying, moisture, can be used as a catalyst carrier and the dehydration of refined organic compounds. Because of its high packing density and low humidity characteristics of moisture absorption effect is remarkable. Can be used as air purifiers, remove the moisture in the air to control the humidity of the air. Also has a wide application in the sea, also can be used as a desiccant between two layers of parallel sealing glass, can keep the transparency of glass. 2, household type of desiccant (wet, small indoor sunshine will g) :


Has the function of the wetted, mouldproof, deodorant, blue indicator is the main life said, when it changed from blue to pink is that life has to. Wet will g major is electronic special equipment, such as computers, cameras, Trinidad mirror etc. Indoor small sunshine is special wardrobe.


Scope of application: silica gel desiccant is to put the silica gel seal in different packaging material made of different grams of small packaging, ranging from 0.5 g to 1000 g in weight. Mainly used as a desiccant, moistureproof beads, in addition to flavor agent and various adsorbent. Silica gel desiccant is a highly efficient hygroscopic material, widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, seed, tea, medicine, cultural relic archives, cameras, arts and crafts, such as the storage and transportation of environmental relative humidity control and prevent the goods be affected with damp be affected with damp, mildew and rust. Have wide application in shipping on the way at the same time, due to the goods in transit due to large temperature be affected with damp be affected with damp, with the product can be effective to wet moistureproof, guaranteeing the quality of the goods. Properties:


Silica gel desiccant is a traditional moisture absorption dehumidification packing seal products. The silica gel has won the gold medal, won the ISO 9001 quality system certification. Pore silica gel pores spherical silica gel and stoma block silica gel two kinds. Pores of spherical silica gel appearance is colorless or yellowish transparent or semi-transparent spherical particles, the pore block silica gel is colorless or light yellow translucent vitreous irregular particles. Of fine silica, also called type A silica gel. It usually is to use sodium silicate and sulfuric acid reaction, and the aging, made by acid soak and a series of post-treatment process. Belong to the amorphous silicate material, its chemical formula mSiO2. NH2O. Insoluble in water and any solvents. Avirulent insipidity, chemical properties not disorderly, in addition to the strong alkali, hydrofluoric acid does not react with any material. Various types of silicone because of the different manufacturing methods and form different microporous structure. Chemical group and physical structure of silica gel, determines it has many other features of similar materials difficult to replace: high adsorption function, hot not disorderly, chemical properties not disorderly, such as high mechanical strength. Scope of application: silica gel desiccant is to put the silica gel seal in different packaging material made of different grams of small packaging, ranging from 0.5 g to 1000 g in weight. Mainly used as a desiccant, moistureproof beads, in addition to flavor agent and various adsorbent. Silica gel desiccant is a highly efficient hygroscopic material, widely used in instruments, meters, instruments, leather, bags, footwear, textiles, food, seed, tea, medicine, cultural relic archives, cameras, arts and crafts, such as the storage and transportation of environmental relative humidity control and prevent the goods be affected with damp be affected with damp, mildew and rust. Have wide application in shipping on the way at the same time, due to the goods in transit due to large temperature be affected with damp be affected with damp, with the product can be effective to wet moistureproof, guaranteeing the quality of the goods. (2) the function of the safety of silica gel


, the chemical properties of silica gel was mostly silica, don't burn. Silica gel is a kind of amorphous silica, should control the workshop dust content is not more than 10 mg/m3, need to be reinforced platoon wind, manipulation when wearing a mask. Silica gel has a strong adsorption ability, drying effect on a person's skin, therefore, manipulation should wear good clothes. If silica gel into the eyes, need a lot of water erosion, and find a doctor as soon as possible. (3) storage and packaging


Silica gel has a strong ability of moisture absorption, so should be stored in a dry place. Between packing and ground to be put aside frame. Packaging has a steel drum, drum, paper box, plastic bottles, polyethylene plastic compound bag, flexible container bags, etc. The classification of the product packaging specifications are as in detail. In the process of transportation should avoid to drench, be affected with damp be affected with damp, and sunlight.


Add: silica gel regeneration method and the attention to matters


Silica gel in use process because of the medium water vapor adsorption or other organic substances, adsorption ability, can be regenerated through repeated use.


A, silica gel regeneration after adsorption of water vapor


Silica gel after moisture absorption, heat by stripping way to remove moisture, there are many types of heating way, such as electric heating furnace, flue waste heat heating and hot air drying, etc.


Stripping heating temperature control in the 120-180 ℃ advisable, for the blue gel indicator, allochroic silica gel, DL blue silica gel is controlled in 100-120 ℃ advisable. All kinds of industrial silica gel regeneration when the highest temperature should not be more than the following limits: coarse silica gel is not higher than 600 ℃; Of fine silica shall not be higher than 200 ℃;


Blue glue index agent (or color silica gel) shall not be higher than 120 ℃; Silicon aluminum adhesive shall not be higher than 350 ℃.


After the regeneration of silica gel, its general control moisture below 2% can be put into use again.


Second, the silica gel regeneration roasting method after the adsorption of organic impurities


For coarse silica gel, and can be put inside furnace heats up to 500-600 ℃, about the 6-8 hours to colloidal particles with a white or brown. For fine silica, roasting temperature should not exceed 200 ℃. 2. Rinse method


The silica gel in the saturated water vapor adsorption saturation after heat soak rinse, and can be combined with detergent to remove waste or other organic impurities, drying dehydration after water washing. 3. Solvent washing method


According to the silica gel adsorption organic matter types, choose the appropriate solvent adsorption in silica gel dissolution of organic matter, and then heat the silica gel to removing solvent.


Three, silica gel regeneration should pay attention to the topic


drying regeneration temperature should be pay attention to grasp the gradual progress, in order to avoid severe dry cause colloidal particle cracking, reduce the recovery.


2. The silica gel regeneration, roasting temperature through high will cause the silica gel pore structure change and significantly reduce its adsorption effect, affect the use value. For the blue gel indicator or discolor silica gel, stripping regeneration temperature shall not exceed 120 ℃, otherwise you will lost due to gradual oxidation agent color effect.


3. After the regeneration of silica gel shall generally be sieve to remove fine particles, so that the average particle.


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