Silica, feem ntau hu ua dawb carbon dub, yog ib qho amorphous synthetic silica (SiO₂·nH₂O) nrog thaj chaw tshwj xeeb siab, muaj peev xwm txhawb nqa zoo heev thiab cov khoom siv tshuaj ruaj khov. Nws yog ib qho dawb, tsis muaj tshuaj lom, tsis muaj ntxhiab hmoov zoo, dav dav lees paub tias yog cov khoom siv inorganic tseem ceeb hauv cov roj hmab niaj hnub thiab cov lag luam polymer. Tsis zoo li carbon dub, silica muab ob qho tib si txhawb nqa siab thiab xim ci sib xws, ua rau nws tseem ceeb rau cov log tsheb ntsuab, cov khoom siv roj hmab xim thiab cov elastomers ua tau zoo.
Kev tsim khoom lag luam ntawm silica feem ntau sivtxoj kev los nagthiabtxoj kev ua pa taws. Precipitated silicayog tsim los ntawm kev sib xyaw sodium silicate nrog acid, ua raws li kev ntxuav, ziab thiab milling; nws muaj qhov chaw tshwj xeeb nruab nrab (150–400 m² / g) thiab tus nqi qis, zoo tagnrho rau cov log tsheb thiab cov roj hmab dav dav. Fumed silica yog ua los ntawm kev kub siab hydrolysis ntawm silicon halide, nrog cov khoom me me nano (10–40 nm), ultra-high purity (SiO₂ ≥99.8%) thiab 3D saw qauv, tsim nyog rau cov txheej txheem siab, cov nplaum thiab cov khoom siv hluav taws xob.
Qhov zoo ntawm silica yog nyob rau hauvkev txhawb zog, kev tuab/thixotropy, kev tiv thaiv kev sib sau ua ke thiab kev ruaj khov tshuaj lom neegHauv roj hmab, nws ua rau lub zog tensile nce ntxiv 200-300%, txhim kho kev hnav tsis kam thiab txo qhov dov tsis kam los ntawm 20-30%. Hauv cov kua dej, nws tsim cov network rov qab tau: tuab thaum so, nyias thaum txiav, zoo meej rau cov txheej thiab cov kua mem. Nws tsis yaj hauv dej thiab feem ntau cov kuab tshuaj, tiv taus cua sov thiab tsis kub hnyiab, ua kom ruaj khov hauv qhov chaw ib puag ncig hnyav.
Qhov kev siv loj tshaj plaws yogkev lag luam roj hmab (≈58% feem), tshwj xeeb tshaj yog cov log tsheb ntsuab. Hloov 30–50% carbon dub nrog silica txo qhov kev tiv thaiv dov, txhim kho kev siv roj los ntawm 5–7% thiab txhim kho kev tiv thaiv ntub dej. Nws kuj tseem siv rau hauv cov khau hauv qab, cov hoses, cov foob thiab cov khoom silicone rau kev ruaj khov zoo dua thiab kev ua haujlwm tau zoo dua. Hauv cov txheej txheem / kua mem, silica ua haujlwm ua tus tiv thaiv kev sib sau ua ke, kev tswj hwm rheology thiab tus neeg sawv cev matting. Hauv kev ua liaj ua teb, nws ua haujlwm ua tus nqa khoom thiab dispersant rau cov tshuaj tua kab thiab chiv.
Kev xaiv zoo tsom mus rauThaj chaw tshwj xeeb, kev faib tawm ntawm cov khoom me me, pH thiab dej nooCov silica zoo muaj qhov zoo sib xws, tsis muaj kuab paug thiab tawg zoo. Ua tus neeg muab khoom tshaj lij, peb muab cov roj hmab qib, txheej qib thiab zaub mov silica nrog kev ruaj khov zoo thiab kev txhawb nqa kev txawj ntse.
Piv nrog cov pa roj carbon dub, silica muaj cov yam ntxwv zoo sib xws.xim sib xws, txo qis dov tsis kam thiab zoo dua UV stabilityNws tsis yog tsuas yog ib qho khoom sau xwb tab sis kuj yog ib qho kev ua tau zoo rau cov ntaub ntawv niaj hnub no. Nrog rau kev loj hlob ntawm cov log tsheb ntsuab thiab kev tsim khoom siab, silica tseem yog qhov tseem ceeb.
Peb tshwj xeeb hauv kev tsim thiab muab cov silica, muab cov qib tshwj xeeb thiab kev xa khoom ntau. Yog xav paub cov specs, cov qauv thiab tus nqi, hu rau peb txhua lub sijhawm.
Lub sijhawm tshaj tawm: Tsib Hlis-15-2026