Muaj ntau homDefoamersthiab lawv tau siv dav. Cov txheej txheem ntawm "ua npuas ncauj" thiab "ua npuas ncauj tawg" ntawm lub defoamer yog: thaum lub defoamer tau ntxiv rau hauv lub cev, nws cov molecules tau muab faib ua ntu zus rau ntawm cov kua dej, inhibiting qhov tsim ntawm cov yeeb yaj kiab elastic, uas yog, tshem tawm cov cim ua npuas ncauj. Thaum lub kaw lus tsim ua npuas dej ntau, ntxiv defoamer, nws cov molecules tam sim ntawd kis rau ntawm cov npuas dej, kis tau sai, tsim ib txheej nyias nyias nyias, ntxiv diffuse, nkag mus, thiab ntxeem tau hauv cov txheej, yog li hloov cov phab ntsa nyias ntawm cov yeeb yaj kiab qub. Vim nws cov khoom muaj qhov ntub dej tsawg, nws ntws mus rau cov kua uas muaj qhov sib cuam tshuam zoo, yog li ntawd ua npuas ncauj ntawm cov roj av nrawm nrawm, thiab ua npuas ncauj kuj cuam tshuam los ntawm ib puag ncig ib puag ncig. Cov zaj duab xis txheej nrog lub siab nro rub tawm, kom qhov kev ntxhov siab nyob ib ncig ntawm cov npuas dej tsis sib npaug, uas ua rau nws "ua npuas ncauj tawg". Cov defoamer molecules uas yog insoluble nyob rau hauv lub system yuav rov nkag mus rau ntawm lwm yam ua npuas ncauj zaj duab xis, thiab hais txog, tag nrho cov ua npuas ncauj yuav puas tag nrho.
Yuav ua li cas xaiv qhov raugAntifoam
Kev tsim khoom thiab kev tsim cov txheej txheem yuav tsim cov npuas kom sib txawv. Lub cim ntawm npuas cuam tshuam qhov kev vam meej ntawm kev tsim khoom thiab kev tsim kho, thiab tib lub sijhawm coj cov teeb meem rau cov txheej txheem tiav. Kev xaiv kom raug ntawm tus defoamer tsim nyog tuaj yeem ua kom muaj kev vam meej ntawm txheej txheej thiab kev tsim kho.
Lub luag haujlwm ntawm lub defoamer: rhuav tshem cov yeeb yaj kiab ua kua rau ntawm qhov chaw ntawm lub npuas, tiv thaiv kev tsim ntawm npuas thiab txhawb kev tawg ntawm npuas. Lub defoamer yog siv rau cov npuas loj, thiab cov microfoam yuav tsum tau siv ua ke nrog degassing thiab defoaming.
Defoamer nta: Lub defoamer yog insoluble hauv nruab nrab, tab sis tuaj yeem nkag mus thiab tawg mus rau hauv nruab nrab hauv daim ntawv ntawm microdroplets. Qhov zoo tshaj plaws txoj kab uas hla ntawm cov defoamer microdroplets yog sib npaug rau lub thickness ntawm cov phab ntsa ua npuas ncauj.
Defoamer muaj pes tsawg leeg:Defoamersrau dej-raws li architectural txheej yog muab faib ua non-silicon thiab silicon-muaj hom. Cov paDefoamersyog tsim los ntawm cov khoom hauv qab no:
Cov tshuaj nquag: Nws ua haujlwm ua npuas dej thiab defoaming tus neeg sawv cev nrog qhov nro qis. Cov neeg sawv cev muaj xws li tsiaj txhu thiab zaub roj, hydrophobic silica, ntau dua cawv, thiab lwm yam.
Diffusion tus neeg sawv cev: Wetting emulsifier kom ntseeg tau tias cov defoaming micro-droplets kis tau thiab tiv tauj cov npuas zaj duab xis thiab sib kis. Muaj cov non(octyl) phenol polyoxyethylene ether, xab npum ntsev thiab lwm yam.
Carrier: Nws pab cov khoom nquag ua ke nrog lub foaming system, thiab yooj yim rau disperse mus rau hauv lub foaming system. Ua ke ob qho tib si, nws muaj qhov nro qis, pab txhawm rau txhawm rau ua npuas dej, thiab tuaj yeem txo cov nqi.
Ob qho xwm txheej yuav tsum tau ntsib rau defoaming: qhov nkag mus: E = γ1 + γ12-γ3 > 0, kom ntseeg tau tias cov defoamer nkag mus rau hauv cov phab ntsa ua npuas dej; Spreading factor S = γ1-v12-γ3 > 0, los xyuas kom meej tias cov defoamer droplets Diffusion kis tau rau hauv cov ntaub ntawv xov xwm.
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Post lub sij hawm: Jan-09-2023