Classification And Bonding Of Silicone
🕙 2023-08-25 👆
Classification：
Generally speaking, silica gel can be divided into two categories of organic silica gel and inorganic silica gel according to its properties and components.
Inorganic silica gel is a kind of highly active adsorption material, which is usually prepared by the reaction of sodium silicate and sulfuric acid, and a series of post-treatment processes such as aging and acid bubble. Silica gel is an amorphous substance and its chemical formula is mSiO2. nH2O. Insoluble in water and any solvent, non-toxic and tasteless, chemically stable, in addition to strong alkali, hydrofluoric acid does not react with any substance. Various types of silica gel form different micropore structures due to their different manufacturing methods. The chemical composition and physical structure of silica gel determines that it has the characteristics of many other similar materials that are difficult to replace: high adsorption performance, good thermal stability, chemical stability, high mechanical strength, etc., for home use as desiccant, humidity regulator, deodorant, etc.; Industrial use as oil hydrocarbon decolorizing agent, catalyst carrier, pressure shift adsorbent, etc. Fine chemical separation and purification agent, beer stabilizer, paint thickening agent, toothpaste friction agent, matting agent, etc.
Organic silica gel is an organosilicone compound, which refers to a compound containing Si-C bond, and at least one organic group is directly connected with silicon atoms, and it is customary to often use those compounds that connect organic groups with silicon atoms through oxygen, sulfur, nitrogen, etc., as organosilicon compounds. Among them, polysiloxane composed of silico-oxygen bond (-Si-o-Si -) as the skeleton is the most numerous, the most deeply studied and the most widely used class of silicone compounds, accounting for more than 90% of the total dosage.
Extrusion of silica gel is more common, such as the sealing ring on the household rice cooker, called the rice cooker silicone sealing ring.
Molded silicone is more complex, irregular shape, including silicone bowls, silicone ice grids, silicone cake molds and so on.
Bonding of silica gel
According to different needs, the following adhesives can be selected:
1. KD-866: Fast bonding silicone material, no surface treatment, single component, easy to operate;
2. KD-855: Suitable for small area silicone and metal plane, facade, sleeve and other bonding, silicone surface needs to be treated with KD-770;
3. KD-833: Suitable for silicone adhesive PP, PE and other difficult plastic, fast bonding; The surface of silica gel should be treated with KD-770;
4. G-988A: suitable for silicone adhesive silicone, silicone adhesive glass, silicone adhesive cloth, etc., single component room temperature vulcanized rubber, after curing is an elastomer with excellent waterproof, shock-proof adhesive, high and low temperature resistance, 1-2mm thickness, about 10 minutes of initial solid, 5-6 hours of basic curing, with a certain strength. It takes at least 24 hours to cure completely. Single component, do not need to mix, after extrusion smear can stand, no need to warm;
5. G-988: Suitable for silicone adhesive plastic (PC, PS, ABS, etc.), silicone adhesive metal (iron, aluminum, stainless steel, zinc alloy, etc.), silicone adhesive bamboo wood, silicone adhesive stone, etc. Single-component room temperature vulcanizate, after curing is an elastomer with excellent waterproof, shockproof adhesive, high and low temperature resistance, 1-2mm thickness, about 10 minutes of initial solid, 5-6 hours of basic curing, there is a certain strength. It takes at least 24 hours to cure completely. Single component, do not need to mix, extrude and apply to stand, no need to warm.
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