Yogsilicon dioxidehaum rau cov txheej txheem tiv thaiv corrosion?
Puas yog silicon dioxide haum rau kev tiv thaiv corrosion? Anti-corrosion txheej yog hais txog cov kua lossis cov khoom siv uas tuaj yeem tsim cov yeeb yaj kiab ntawm cov khoom hauv qee yam kev tiv thaiv, kho kom zoo nkauj lossis lwm yam haujlwm tshwj xeeb (kev rwb thaiv tsev, tiv thaiv xeb, tiv thaiv mildew, tiv thaiv tshav kub, thiab lwm yam). Vim tias feem ntau ntawm cov txheej thaum ntxov siv cov roj zaub ua cov khoom siv tseem ceeb, lawv kuj tau hu ua xim. Synthetic resin muaj ntau los yog tag nrho hloov zaub roj, yog li nws yog hu ua txheej. Nws feem ntau muaj peb txoj haujlwm: tiv thaiv, kho kom zoo nkauj, npog cov khoom tsis xws luag, thiab txhim kho cov khoom muaj nqis. Dab tsi yog lub luag haujlwm ntawm silicon dioxide hauv kev tiv thaiv corrosion?
Nyob rau hauv lub formulation ntawm anti-corrosion txheej, silica yog siv raws li thickening thixotropic thiab anti-tshuaj additive. Thickening, tiv thaiv kev daws teeb meem, ncua kev kawm ntawv thiab lwm yam kev ua haujlwm ua rau cov fillers thiab lwm yam additives sib npaug sib npaug hauv cov resin yam tsis muaj nag lossis daus; Thixotropic nyhuv ua rau cov txheej txheem muaj kev ua haujlwm zoo sagging thiab tuab txheej, thiab txhim kho kev tsim kho.
Action mechanism:
Thaum silica yog dispersed nyob rau hauv cov kua uas tsis yog-polar, cov silanol pawg nyob rau saum npoo ntawm txawv particles tsim ib tug choj los ntawm hydrogen daim ntawv cog lus kev sib raug zoo, thiab cov muaj pes tsawg leeg ntawm peb-dimensional qauv tsim thickening nyhuv. Thaum lub kaw lus raug cuam tshuam los ntawm cov neeg kho tshuab sab nraud, xws li nplawm lossis co, cov qauv puas. Hom thiab lub sijhawm ntawm kev siv tshuab sab nraud txiav txim siab qhov kev puas tsuaj, thiab cov txheej txheem thickening ua kua dua. Yog tias nws tseem zoo li qub, cov khoom siv silica yuav txuas nrog kom rov qab zoo li qub viscosity. Qhov tshwm sim no hu ua pseudoplasticity.
Anti-corrosion coatings feem ntau yog epoxy resin, polyurethane resin, vinyl resin thiab lwm yam tshuab. Cov resins no muaj zog polar pawg, feem ntau hydrophilic fumed silica yog siv, uas yog ib qho yooj yim rau hnyav nyhuv, thiab muaj viscosity zoo thiab ncua kev kawm ntawv tom qab dispersion. Txawm li cas los xij, thaum muab tso rau ib lub lis piam mus rau kaum hnub, pawg polar puas rhuav tshem cov hydrogen bonds ntawm lub network qauv, ua rau hydrogen bond cracking, thinning, tsis muaj thixotropy, muab tub lim thiab lwm yam teeb meem. Yog li ntawd, nws raug pom zoo kom siv hydrophobic hloov fumed silica nrog muaj zog stability, Tsis txhob hnyav hnyav.
Lub thickening thiab thixotropy ntawm silica nyob ntawm ntau yam ntawm lub zog dispersion, thiab yam tsawg kawg yuav tsum tau ib tug high-ceev disperser. Yuav kom ua tiav qhov zoo tshaj plaws dispersion nyhuv, lub rotor yuav siv tau rau disperse los yog lub pob tshuab thiab peb-roller tshuab yuav siv tau rau disperse.
Qhov kev xaiv zoo tshaj plaws ntawm txoj kev dispersion thiab cov khoom siv dispersion nyob ntawm qhov sib xws ntawm qhov system. Qee lub sij hawm peb xav kom siv qee cov kua lossis qee cov ntaub ntawv raw cov ntaub ntawv kom tawg tag nrho cov silica, thiab tom qab ntawd ntxiv cov kua uas seem thiab lwm cov ntaub ntawv raw cov ntaub ntawv los kho cov ntsiab lus ntawm silica kom tau raws li qhov xav tau ntawm cov mis. Raws li txoj cai, cov nyhuv thickening ntawm silica nce nrog qhov txo qis ntawm qhov loj me me, tab sis nrog qhov nce ntawm qhov loj me, siab dua shear quab yuam yuav tsum ua kom tiav nws cov nyhuv thickening.