What are the main functional uses of silicone materials
1、 Safety performance
The main component of silicone is silica, which is chemically stable and does not burn. Silica gel is a kind of amorphous silicon dioxide, and the dust content in the workshop should be controlled to be no more than 10 mg/m3. Air exhaust should be strengthened, and masks should be worn during operation.
Silicone has strong adsorption capacity and can cause dryness to human skin. Therefore, work clothes should be worn during operation. If silicone enters the eyes, rinse with plenty of water and seek medical attention as soon as possible.
Blue silica gel is toxic because it contains a small amount of Cobalt(II) chloride. It should be avoided from contact with food and inhalation. In case of poisoning, a doctor should be sent immediately.
Silicone has a decreased adsorption capacity due to the adsorption of water vapor or other organic substances in the medium during use, and can be reused after regeneration.
2、 Regeneration of water vapor adsorbed by silica gel
After silica gel adsorbs water, it can be removed through thermal desorption, which can be heated in various ways, such as electric furnaces, flue heat heating, and hot air drying.
The temperature for desorption heating should be controlled at 120-180 ℃, while for blue gel indicators, discolored silica gel, and DL type blue silica gel, it is appropriate to control it at 100-120 ℃. The maximum temperature during the regeneration of various industrial silicone materials should not exceed the following limits:
The coarse pore silica gel should not exceed 600 ℃;
Fine porous silica gel should not exceed 200 ℃;
The blue adhesive indicator (or discolored silicone) shall not exceed 120 ℃;
Silicon aluminum adhesive shall not exceed 350 ℃.
After regeneration, the water content of the silicone gel is generally controlled below 2% and can be reused.
3、 Regeneration of silica gel after adsorbing organic impurities
1. Baking method
For coarse porous silica gel, it can be gradually heated to 500-600 ℃ in a roasting furnace, and it takes about 6-8 hours to reach
The rubber particles can be white or yellowish brown. For fine porous silica gel, the roasting temperature should not exceed 200 ℃.
2. Rinsing method
After the silica gel is adsorbed in saturated water vapor and reaches saturation, it is soaked and rinsed in hot water, and can be combined with detergents to remove waste oil or other organic impurities. After washing with clean water, it is dried and dehydrated.
3. Solvent flushing method
According to the type of organic matter adsorbed on silica gel, select an appropriate solvent to dissolve the organic matter adsorbed inside the silica gel, and then heat the silica gel to remove the solvent.
4、 Precautions for silicone regeneration
When drying and regenerating, attention should be paid to gradually increasing the temperature to avoid severe drying that may cause the rubber particles to burst and reduce the recovery rate.
2. When regenerating silica gel during calcination, excessive temperature can cause changes in the pore structure of the silica gel, significantly reducing its adsorption effect and affecting its value in use. For blue gel indicators or discolored silica gel, the temperature for desorption regeneration should not exceed 120 ℃, otherwise the color developing effect will be lost due to the gradual oxidation of the color developing agent.
3. The regenerated silica gel should generally be sieved to remove fine particles, in order to make the particles uniform.
5、 Storage and Packaging
Silicone has strong moisture absorption ability, so it should be stored in a dry place, and there should be shelves between the packaging and the ground. The packaging materials include steel drums, paper drums, cardboard boxes, plastic bottles, polyethylene plastic composite bags, flexible container bags, etc. During transportation, it is important to avoid rain, moisture, and exposure to sunlight.
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6、 The Use of Inorganic Silicone
Macroporous silica gel is generally used as a catalyst carrier, extinction agent, abrasive, etc. Therefore, different varieties should be selected based on different uses.
Silicone can be used as a desiccant and can be reused. Silica gel is a porous material with different particle sizes, which is formed by properly dehydrating silicic acid gel mSiO2 · nH2O. It has an open porous structure, a large specific surface area (per unit mass), and can adsorb many substances. It is a good desiccant, adsorbent, and catalyst carrier. The adsorption effect of silica gel is mainly physical adsorption, which can be regenerated and reused. Add acid to alkali metal silicate (such as Sodium metasilicate) solution to acidify it, and then add a certain amount of electrolyte to stir it to generate silicic acid gel; Alternatively, adding acid or ammonium salt in the concentrated Sodium metasilicate solution can also generate silicic acid gel. The silicic acid gel is allowed to stand for several hours to age, then the soluble salts are washed off with hot water, dried at 60~70 ℃ and activated at about 300 ℃ to obtain silica gel. The silica gel is soaked in Cobalt(II) chloride solution, dried and activated to obtain discolored silica gel. When using it as a desiccant, it turns blue before water absorption and red after water absorption. The change in color can indicate the degree of water absorption and whether regeneration treatment is needed. Silicone is also widely used for steam recovery, petroleum refining, and catalyst preparation - silicone rubber electronic buttons
Inorganic silica gel can be used as a desiccant in the following aspects
1. Mainly used for moisture absorption and rust prevention of instruments, meters, equipment, etc. under sealed conditions.
2. When used in conjunction with ordinary silicone desiccants, it indicates the degree of moisture absorption of the desiccant and determines the relative humidity of the environment. As a silicone desiccant for packaging, it is widely used in precision instruments, leather, clothing, food, pharmaceuticals, and household appliances.
3. Silicone can be used as a food grade product for products that come into direct contact with the human body, such as baby pacifiers. Additionally, silicone can also be used to produce condoms.
What is the structure of silicone tubes Generally speaking, the consumption structure of silicone rubber pipes is to stop processing and disposal of natural silicone rubber, and then stop processing according to the required formula. Initially, the decomposition agent and other materials involved are decomposed by rubber refining machines and grinding tools, forming one pipe after another. However, ordinary factories can present pipe construction when consuming pipes. The construction of pipes refers to the use of silicone rubber with weak white carbon black during the consumption process, which hardens during storage, resulting in a decrease in the plasticity of the rubber and the loss of processing function. This scene is called "pipe construction". reason 1. The most common theory is that under the influence of temperature, the surface of the Mars silanol group undergoes chemical reactions with the raw rubber molecules, causing them to condense, leading to rubber hardening and reduced plasticity. 2. The base atoms on the surface of white carbon black react with raw rubber molecules to form hydrogen bonds and even chemical bonds. Transforming the silicon hydroxide inside the silicone rubber into a pseudo crosslinked or micro crosslinked solid shape constitutes the curing of the silicone rubber. Disposal Measures 1. Living in silicone rubber with "structured control extrusion" is the rarest disposal method in consumption. 2. Suspend the treatment of the appearance of white carbon black to prevent the occurrence of white carbon black and rubber.
Is silicic acid gel and silica gel the same material Is silicic acid gel and silica gel the same material? Silicic acid, chemical formula H2SiO3. It is a weak acid, and its salt has a hydrolysis effect in aqueous solution. Free silicic acid, including Orthosilicic acid (H4SiO4), metasilicic acid (H2SiO3) and disilicic acid (H2Si2O5), is very weak. The ionization Equilibrium constant of metasilicic acid K1=2 * 10-10 (room temperature), and the orthosilicic acid is firm within the range of PH=2-3. However, if the Supersaturation H4SiO4 solution is temporarily placed, there will be amorphous silica precipitation, which is milky white precipitation, and appears as colloidal particles, precipitates or gel. Some water in the gel evaporates, and a porous monotonous solid gel can be lost, that is, rare silica gel. The silicic acid gel has strong adsorbability, and can be used as a moisture absorption agent, a catalyst, or a carrier of other catalysts. Silica gel, also called silicic acid gel, is a kind of highly active adsorption material, which belongs to amorphous substance, and its chemical Molecular formula is mSiO2 · nH2O; Except for strong bases and hydrofluoric acid, it does not react with any substance, is insoluble in water and any solvent, is non-toxic and odorless, and has strong chemical properties. Compared to silica gel, silicic acid contains more hydroxyl groups and is a high-purity reagent silica gel.
With the continuous development of food industry technology, the raw materials for the inner and outer packaging of many products are also being upgraded from time to time. Among them, food grade silicone tubes are also very rare in this range. Of course, in the process of understanding a new type of material, we should also pay attention to its firmness and safety. Let's have a detailed understanding above! Firstly, strong low temperature resistance Regarding the internal and external packaging materials of food, low temperature resistance is a very important characteristic, which indirectly affects the safety of this material. Assuming that the low temperature resistance is relatively weak, it is likely to release a certain amount of water that is harmless to health. Secondly, good clarity The permeability of food grade silicone hoses is relatively high. In this way, high-tech methods can be used to enhance the adhesion of the sol during the production process, thereby enhancing the permeability of the product. This can improve the visual effect for consumers. Thirdly, there is no odor Regardless of the type of information in the food, if there is an odor present during the process of discontinuing consumption and manufacturing, it is likely to affect the quality of the product. Therefore, food grade silicone tubing also has this disadvantage, as it does not have any odor. This way, during the process of discontinuing manufacturing, it will not affect the quality of the product and is not prone to decay in a sealed environment. Overall, the disadvantages of food grade silicone tubing are quite clear. In the process of data comparison, it can be considered as high-quality silicone material. Therefore, looking at this plastic material, it can meet the needs of ancestors for a healthy diet and ensure the consumption of high-quality food.
Performance of medical silicone tubing: 1. High transparency, high-level health, environmental protection, high efficiency, high-temperature and high-pressure sterilization and disinfection; 2. Medical silicone tubes have good physiological inertness, and tissues will not cause harm to the human body. They will not cause foreign objects to enter human tissues after the reaction value, causing inflammation in surrounding tissues; 3. As shown in. High strength, high tearing, low shrinkage, and good toughness; 4. As shown in. High temperature and low temperature resistance, high ginger will not deform, nor produce harmful substances synthesis, physiological inertia, strong biological aging resistance; 5. High level of health and environmental protection, passing food safety inspections by the US Food and Drug Administration and the German LFGB, etc