Tetraethoxylate, kuj hu uatetraethyl orthosilicate, yog hu ua TEOS luv luv. Ethyl silicate yog cov kua tsis muaj xim thiab pob tshab nrog cov ntxhiab tsw tshwj xeeb hauv qhov kub thiab txias. Nws ruaj khov nyob rau hauv lub xub ntiag ntawm cov dej tsis muaj dej, decomposes rau hauv ethanol thiab silicic acid nyob rau hauv lub xub ntiag ntawm dej, ua turbid nyob rau hauv cov huab cua ntub, thiab yaj nyob rau hauv cov organic solvents xws li cawv thiab ether. Cov mis mos molecular yog (C2H5O) 4Si, melting point - 77 degree, boiling point 168.1 degree. Toxic, mob heev rau tib neeg lub qhov muag thiab ua pa ib ntsuj av. Nws yog npaj los ntawm distillation tom qab qhov kev txiav txim ntawm silicon tetrachloride thiab kiag li ethanol. Nws yog siv los npaj cov tshuaj tiv thaiv tshav kub thiab tshuaj corrosion-resistant coatings thiab silicone solvents. Nws tseem tuaj yeem siv rau cov khoom siv organic, cov ntaub ntawv raw khoom siv rau kev npaj cov khoom siv qib siab, cov tshuaj kho qhov muag iav, cov ntaub qhwv, cov ntaub ntawv insulating hauv kev lag luam hluav taws xob, thiab lwm yam.
Ethyl silicate yog cov kua silicate, uas tuaj yeem siv los ua tus neeg sawv cev rau cov xim pleev xim. Ethyl silicate yog cov kua ntshiab thiab nyias, uas zoo ib yam li cov kuab tshuaj tsis haum rau ntawm qhov chaw. Tom qab ua tib zoo ntxiv cawv thiab dej me me, nws yuav raug hydrolyzed rau hauv cov kua nplaum ntshiab silicic acid. Ua ntej ziab, nws yuav dhau los ntawm theem nrab ntawm viscosity thiab adhesion. Siv Ethyl Silicate Pigment rau ntawm qhov nqus los yog permeable nto tuaj yeem tsim cov nyhuv uas tuaj yeem sib tw nrog cov fresco; Lub durability ntawm Ethyl Silicate Pigment thiab lub freshness ntawm chemicalbook xim yog zoo dua li cov frescoes. Cov pigment yuav tsum tau npaj txhua hnub kom tshiab, thiab thaum dej ntxiv, hydrolysis yuav tsis nres. Ethyl silicate yog qhov zoo tshaj plaws thiab yooj yim siv ntawm ntau yam silicon esters. Ethyl silicate yog thawj zaug nkag rau hauv cov xim hnyav los ntawm George huab tais hauv tebchaws Askiv hauv xyoo 1931, thiab tau nkag mus rau Tebchaws Meskas los ntawm Ralph Mayer xyoo 1937.
Ethyl silicate nws tus kheej tsis muaj peev xwm khi. Yog tias ethyl silicate siv los ua cov ntaub ntawv ntawm cov ntaub ntawv refractory, nws tuaj yeem siv tau tom qab kev kho hydrolysis nkaus xwb. Lub hydrolysis ntawm ethyl silicate ua tau qeeb heev nyob rau hauv cov dej xwb. Thaum catalyzed los ntawm acid (H ntxiv) los yog tshuaj Phau Ntawv puag (OH -), lub hydrolysis ceev yog heev ceev. Feem ntau, hydrochloric acid yog siv los ua cov catalyst, vim hais tias siv alkali raws li cov catalyst yuav ua rau cov tshuaj hydrolytic gel sai sai thiab ua rau cov hydrolytic sol poob stability, yog li poob lub peev xwm binding. Cov tshuaj tiv thaiv hydrolysis ntawm ethyl silicate tshwm sim nyob rau hauv catalysis ntawm acid. Hauv cov ntsiab lus, cov tshuaj tiv thaiv hydrolysis yog tias pawg ethoxy (C2H5O -) hauv ethyl silicate yog hloov los ntawm hydroxyl (- OH) hauv dej. Yog li ntawd, ethyl silicate (si4-oc2h5) hloov mus rau hauv silanol pawg (si4-oh). Silanol pab pawg muaj kev ua haujlwm siab thiab tuaj yeem txuas ntxiv cov kua qaub sib pauv lossis etherification nrog lwm pawg ethyl silicate lossis silanol. Txawm li cas los xij, qib ntawm hydrolysis cov tshuaj tiv thaiv yuav tsum tau tswj kom ua kom ruaj khov ethyl silicate hydrolysate. Txwv tsis pub, cov txiaj ntsig tsis tu ncua yuav tsim cov organic polysiloxane thiab poob nws qhov ruaj khov, thiab dhau los ua gel insoluble, yog li poob nws txoj haujlwm. Kev ruaj ntseg ntawm ethyl silicate hydrolyzate feem ntau yog kho los ntawm kev ntxiv cov kua qaub los yog alkali rau hauv phau ntawv tshuaj. Thaum tus nqi pH nyob nruab nrab ntawm 1.5 thiab 2.5, cov gel tshwm rau lub sijhawm ntev, thiab hydrolyzate yog qhov ruaj khov tshaj plaws. Thaum nws qis dua lossis siab dua li qhov ntau, cov hydrolyzate tuaj yeem tshwm sim, thiab thaum tus nqi pH nyob nruab nrab ntawm 5 thiab 6, gel tshwm, thiab hydrolyzate yog qhov tsis ruaj khov tshaj plaws. Yog li, qhov dav dav hydrolyzate yuav tsum tau tswj hwm ntawm 2.0 ~ 2.5 kom tswj tau nws qhov ruaj khov, thiaj li tswj tau lub sijhawm ua haujlwm (lub sijhawm tsim kho lossis molding) tom qab sib xyaw nrog cov khoom siv refractory. Ethyl silicate hydrolyzate tuaj yeem siv los ua cov ntaub ntawv ntawm precision casting pwm refractory cov ntaub ntawv, nrog rau cov ntaub ntawv ntawm av nplaum, siab alumina, corundum, zircon uas muaj quartz, mullite, silicon carbide thiab lwm yam khoom thiab castables.
Siv nyob rau hauv precision casting li lub binder ntawm xuab zeb pwm; Cov hlau nto kho nrog ethyl silicate vapor tuaj yeem tiv thaiv corrosion thiab tsis muaj dej. Ethyl silicate tuaj yeem siv rau infiltrate silicon ntawm cov hlau nto, thiab kev kho qhov muag iav tuaj yeem txhim kho lub teeb xa hluav taws xob; Cov ntaub ntawv zoo heev cov pa oxygen silicon hmoov uas ua tiav tom qab ua tiav hydrolysis tuaj yeem siv los tsim cov phosphor. Ethyl silicate yog raw khoom ntawm cov organic silicone roj. Ethyl silicate kuj tseem siv tau los tsim cov tshuaj tiv thaiv tshav kub thiab tshuaj tiv thaiv. Hauv Nyij Pooj, 90 feem pua ethyl silicate yog siv los ua cov khoom siv los tiv thaiv corrosion txheej (zinc nplua nuj xim).
Nws tseem tuaj yeem siv rau hauv cov tshuaj tiv thaiv kab mob thiab cov txheej txheem kub-resistant, silicone solvents thiab precision adhesives. Tom qab ua tiav hydrolysis, zoo heev silica hmoov yog tsim, uas yog siv los ua phosphor thiab tshuaj reagent. Txawm li cas los xij, nws yog tsuas yog siv rau cov iav kho qhov muag, tshuaj tiv thaiv cov txheej txheem, cov txheej txheem kub-resistant thiab cov nplaum; Kev hloov kho ntawm cov txheej txheem anticorrosive; Crosslinking tus neeg sawv cev, binder thiab dehydrating tus neeg sawv cev; Kev tsim daim ntawv thov cov txheej txheem catalyst thiab high-purity ultra-fine silica tetraethyl orthosilicate yog tsuas yog siv rau cov iav kho qhov muag, tshuaj resistant coatings, tshav kub-resistant coatings thiab adhesives; Kev hloov kho ntawm cov txheej txheem anticorrosive; Crosslinking tus neeg sawv cev, binder thiab dehydrating tus neeg sawv cev; Kev tsim cov txheej txheem catalyst thiab high-purity ultrafine silica. Daim ntawv thov: insulating cov ntaub ntawv rau kev lag luam hluav taws xob, coatings, kho qhov muag iav tus neeg saib xyuas, coagulant, organic synthesis, hnyav rau kev npaj organosilicon. Nyob rau hauv lub embedded compound tsim H ntxiv - Magadiite, nws yuav hnov mob nrog dodecylamine los kawm sib xyaw hlau bioactive iav. Precursor rau kev npaj qhuav gel.