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深圳硅膠制品廠深圳橡膠制品世邦欣科技對硅膠品種的分析

發布時間:2011-2-22 點擊:6507 字體大?。?span onClick="javascript:fontSize('news_content','12px')">小 返回
硅膠的品種:硅橡膠主要分為室溫硫化硅橡膠,高溫硫化硅橡膠。因此,室溫硫化硅橡膠按成分、硫化機理和使用工藝不同可分為三大類型,即單組分室溫硫化硅橡膠、雙組分縮合型室溫硫化硅橡膠和雙組分加成型室溫硫化硅橡膠。這三種系列的室溫硫化硅橡膠各有其特點:單組分室溫硫化硅橡膠的優點是使用方便,但深部固化速度較困難;雙組分室溫硫化硅橡膠的優點是固化時不放熱,收縮率很小,不膨脹,無內應力,固化可在內部和表面同時進行,可以深部硫化;加成型室溫硫化硅橡膠的硫化時間主要決定于溫度。   
 硅橡膠按其硫化特性可分為熱硫化型硅橡膠和室溫硫化型硅橡膠兩類。按性能和用途的不同可分為通用型、超耐低溫型、超耐高溫型、高強力型、耐油型、醫用型等等。按所用單體的不同,可分為甲基乙烯基硅橡膠,甲基苯基乙烯基硅橡膠、氟硅,腈硅橡膠等。
Varieties of silica gel: silicone rubber RTV silicone rubber consists of high temperature vulcanized silicone rubber. Therefore, by component RTV silicone rubber, curing mechanism and the use of technology can be divided into three types, namely, one-component RTV silicone rubber, dual-component condensation RTV silicone rubber and two-component addition cure RTV silicone rubber . These three series of room temperature vulcanized silicone rubber has its own characteristics: one-component RTV silicone rubber has the advantage of easy to use, but the curing rate of the more difficult deep; two-component room temperature vulcanized silicone rubber has the advantage of curing and hold heat, shrinkage is very small, not inflated, no internal stress, curing and surface at the same time internal, you can deep sulfide; plus RTV silicone rubber molding cure time depends mainly on temperature.
 Curing characteristics of silicone rubber can be divided according to their heat curing silicone rubber and RTV silicone rubber types. According to the different properties and uses can be divided into general-purpose, ultra-low temperature type, ultra high temperature, high strength-based, oil-based, medical-type and so on. Used by the different monomers can be divided into methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, fluorosilicone, nitrile rubber and so on.
硅膠吸附有機雜質后的再生方法:
⒈焙燒法   
對于粗孔硅膠,可放在焙燒爐內逐漸升溫至500--600℃,約經6—8小時至膠粒呈白色或黃褐色即可。對細孔硅膠,焙燒溫度不能超過200℃。   
  ⒉漂洗法   
將硅膠在飽和水蒸汽中吸附達到飽和后放熱水中浸泡漂洗,并可結合使用洗滌劑以除去廢油或其它有機雜質,再經凈水洗滌后烘干脫水。   
  ⒊溶劑沖洗法   
根據硅膠吸附有機物種類,選用適當的溶劑將吸附在硅膠內的有機物溶出,然后將硅膠加熱以脫除溶劑。
硅膠再生應注意的問題
?、焙娓稍偕鷷r應注意掌握逐漸提高溫度,以免劇烈干燥引起膠粒炸裂,降低回收率。   
   ⒉對硅膠焙燒再生時,溫度過高會引起硅膠孔結構的變化而明顯降低其吸附效果,影響使用價值。對于藍膠指示劑或變色 硅膠,脫附再生的溫度應不超過120℃,否則會因顯色劑逐步氧化而失去顯色作用。   
   ⒊經再生后的硅膠一般應過篩除去微細顆粒,以使顆粒均勻。
Silica gel adsorption regeneration of organic impurities:
⒈calcination
For the coarse silica gel can be placed within the gradually warming up to the roaster 500 - 600 ℃, after about 6-8 hours to rubber can be white or tan. Of pore silica gel, calcination temperature should not exceed 200 ℃.
 ⒉ rinse method
The silica gel in saturated water vapor to reach saturation in the adsorption heat water immersion rinse, and combined with detergent to remove oils or other organic impurities and then washed by water drying dehydration.
 ⒊ solvent washing method
Organic compounds based on silica gel, choose the appropriate solvent in the adsorption of organic matter dissolved in the silica gel, silica gel and then heated to removal of solvent.
Regeneration Problems in silica gel
   ⒈ drying should be careful to take the gradual increase in regeneration temperature, so as not to burst particles caused severe drying and reduce the recovery rate.
   ⒉ regeneration of silica calcination temperature is too high will cause changes in pore structure of silica gel significantly reduced the adsorption effect of use value. For the blue silica gel indicator or discoloration, desorption temperature should not exceed regeneration of 120 ℃, otherwise they will be gradually oxidized reagent lose color effects.
   ⒊ been regenerated silica should generally be sifted to remove fine particles, so that uniform particles.
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