Qhov sib txawv thiab kev siv ntawm hydrophilic silica thiabhydrophobic silica
Silica nws tus kheej yog hydrophilic, hydrophobic silica yog hloov kho los ntawm hydrophobic pawg. Hydrophilicity feem ntau yog ntxiv rau qhov aqueous system. Hauv cov kab mob organic, hydrophilic silica tsis tuaj yeem tawg tau zoo tom qab ntxiv, thiab cov hydrophobic silica tuaj yeem tawg tau zoo.
Hydrophilic silica tau npaj los ntawm hydrolysis ntawm volos chlorosilane hauv cov nplaim oxyhydrogen. Los ntawm qhov xav tau tshuaj lom neeg, cov tshuaj xoob dawb xoob yog tsim ntawm qib siab-purity amorphous silica. Hydrophilic silica tuaj yeem ntub nrog dej thiab dej hauv dej. Ntxiv rau cov kab lis kev lag luam ib txwm muaj, xws li polyester, silicone, xim thiab txheej, cov khoom siv hydrophilic silica muaj ntau dua thiab siv tau zoo hauv cov teb zoo. Lub nano particle cov yam ntxwv thiab siab purity ntawm silica ua rau nws cov ntawv thov hauv kev lag luam hluav taws xob thiab kho qhov muag fiber ua si lub luag haujlwm tseem ceeb. Cov khoom lag luam ntawm hydrophilic fumed silica muaj amorphous qauv los ntawm kev xoo hluav taws xob tsom. Raws li kev ua lag luam sib txawv thiab thov daim teb, peb tuaj yeem muab cov khoom lag luam nrog ntau qhov sib txawv thiab qhov chaw tshwj xeeb. Qee cov khoom lag luam silica tuaj yeem zuag thiab muab rau. Qee cov khoom lag luam yog qib kev kho mob.
Kev ua haujlwm ntawm hydrophilic silica: haum rau kev ua thiab kho kom haum rau cov cuab yeej zoo; qhov cuab lub zog ntawm silicone elastomer; tuab ntawm cov kua tsis ncov qaum; ntws pab rau cov khoom noj thiab cov hmoov lag luam; siab tshuaj purity; kev ua tau zoo rwb thaiv tsev txawm tias nyob hauv qhov kub kub; kev hloov pauv cov kua ua hmoov, xws li tshuaj thiab tshuaj pleev ib ce.
Hydrophobic silica
Hydrophobic silica yog npaj los ntawm cov tshuaj lom neeg cov tshuaj tiv thaiv ntawm hydrophilic silica thiab lub silane nquag (xws li chlorosilane lossis hexamethyldisilazane). Nws yog hydrophobic (hydrophobic) thiab tsis tuaj yeem tawg nyob hauv dej. Txhawm rau daws qee qhov teeb meem tshwj xeeb hauv kev lag luam, ntau hom hydrophobic silica tau tsim. Piv txwv li, hydrophobic silica yog tsim los ntawm kev kho qhov hloov kho hydrophilic silica nrog silane lossis siloxane. Hauv cov khoom kawg, tus neeg sawv cev siv tshuaj tua kab mob sib xyaw ua ke ntawm tus thawj hydrophilic oxide los ntawm kev sib xyaw tshuaj. Ntxiv rau qhov zoo tshaj plaws saum toj no ntawm cov khoom siv ua kua hydrophilic, cov khoom siv hydrophobic silica yog cov yam ntxwv tsis tshua muaj dej noo, ua kom tawg zoo, thiab rheological kev cai muaj peev xwm txawm tias rau cov tshuab polar. Qee cov khoom lag luam, tom qab kev teeb tsa hloov kho los ntawm kev kho hydrophobic, tuaj yeem muab kev pab ntxiv rau cov neeg siv khoom tsim cov khoom tshiab thiab txhim kho kev ua haujlwm. Piv txwv, hauv cov kua hluav taws xob, hydrophobic silica tuaj yeem ncav cuag cov ntsiab lus siab, tab sis muaj cov cuam tshuam me hauv viscosity ntawm lub system.
Kev tso cai ntawm hydrophobic dawb carbon dub: tsim nyog rheology hauv kev ua thiab siv; tuab ntawm cov kua polar, xws li epoxy cob; qhov cuab lub zog ntawm silicone elastomer; siab ntxiv, xws li hauv cov khoom lag luam muaj pwm; zoo hydrophobicity, txhim kho kev txhim kho corrosion; txhim kho cov khoom siv dielectric, xws li hauv kab hluav taws xob; hmoov pab, xws li hauv cov hmoov txheej thiab tshuaj tua hluav taws; txhim kho kev tiv taus nyob rau hauv txheej thiab yas Kos.
Tiv tauj peb:
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