Defoamer Routine Test Method
1. Kev sim tshuaj tsuag: tshuaj tsuag cov tshuaj npuas kom ua npuas, thiab tom qab ntawd ntxiv ib tus neeg defoaming los ntsuas cov nyhuv defoaming raws li lub sijhawm ua rau defoaming.
2. Kev sim co: Ntxiv cov defoamer rau hauv cov tshuaj npuas dej, co los ntawm tes, saib nws ntawm lub sijhawm tsis tu ncua, thiab sau lub sijhawm defoaming.
3. Circulating twj tso kua mis: Muab cov npuas tov rau hauv ib lub voj kaw kom circulate, ntxiv defoamer rau do, thiab ntsuas qhov ua npuas ncauj qhov siab.
4. Kev ntsuas Densitometer: ua ntej ntsuas qhov ntom ntawm cov tshuaj, tom qab ntawd ntxiv cov tshuaj thiab cov defoamer los ntsuas qhov sib xyaw ntom ntom, thiab suav qhov sib txawv ntom ntom.
Emulsion hom defoamer nrhiav txoj kev
Cov tsos mob: Siv 20ml ~ 50ml qauv rau hauv 100ml beaker, thiab los ntawm kev kuaj pom, nws cov xim yog dawb los yog daj me ntsis kom tsim nyog.
PH tus nqi: Siv cov ntawv xeem pH los ntsuas pH tus nqi ntawm emulsion nws tus kheej.
Kev txiav txim siab ntawm cov ntsiab lus ntawm cov khoom: Raws li txoj kev dav dav ntawm GB / T6284 kev txiav txim siab cov khoom siv tshuaj lom neeg, cov ntsiab lus noo noo hauv cov defoamer yog ntsuas. Txiav tawm cov dej noo yog cov ntsiab lus ntawm cov khoom defoamer. Siv ib qho kev ntsuas ntsuas los ntsuas qhov hnyav lub raj mis M1, ntxiv 2 mus rau 3 grams ntawm defoamer qauv hnyav M2, muab tso rau hauv lub thawv kub kom qhuav, thiab ci ntawm qhov kub ntawm 105 ° C rau 1.5 mus rau 2 teev kom qhov hnyav tas li. Qhov hnyav yog M3, uas yog, cov ntsiab lus khoom yog [(M3-M1) / (M2-M1)] × 100%.
Lub sij hawm defoaming: Siv 100ml stoppered ntsuas lub tog raj kheej kom noj (50 ± 0.5) ml ntawm 1.0% nonylphenol polyoxyethylene ether (qib kev lag luam), qhov kub thiab txias mus rau (25 ± 1) ℃, ntxiv txog 0.2g (sample rau 0.001g) , npog lub stopper, co lub ntsuas lub tog raj kheej nce thiab nqis 10 zaug ntawm qhov zaus ntawm (30 ~ 35) cm ntawm qhov zaus ntawm 2 zaug / thib ob, sawv ntsug thiab pib lub sijhawm, sau lub sijhawm nws yuav siv rau cov npuas dej kom ploj mus txog thaum cov kua nto zoo li defoam. sij hawm.
Kev ruaj ntseg: (centrifuge 800)
Ntsuas 8ml cov qauv nyob rau hauv ob lub 10ml centrifuge raj, muab lawv symmetrically nyob rau hauv lub centrifuge, thiab tig tsis tu ncua rau 15 feeb ntawm ib tug ceev ntawm 3000 rpm, thiab coj lub xeem raj mus rau visually kuaj tsis-stratification.
Defoaming txoj cai
Ua Npuas Ncauj yog ib qho kev faib tawm uas cov roj tau tawg hauv cov kua. Gas yog ib theem dispersed thiab kua yog qhov nruab nrab dispersion. Lub xeev ruaj khov yog tsim vim cov pa roj yog insoluble nyob rau hauv ib tug surfactant. Tom qab tsim cov npuas, vim yog cov nyhuv intermolecular ntawm lub foaming system, hydrophilic pawg thiab hydrophobic pawg yog adsorbed los ntawm cov npuas phab ntsa los tsim ib tug tsis tu ncua kev npaj. Cov pab pawg hydrophilic ntsib cov dej theem thiab cov pab pawg hydrophobic ntsib cov npuas, yog li tsim cov yeeb yaj kiab elastic ntawm qhov sib txuas ntawm cov npuas. , Nws ruaj khov heev, nws tsis yooj yim rau tawg nyob rau hauv ib txwm muaj mob. Nyob rau tib lub sij hawm, ua npuas ncauj yog ib tug thermodynamically unstable system. Nyob rau hauv qhov kev txiav txim ntawm lub ntiajteb txawj nqus, cov kua zaj duab xis yog tsis tu ncua ntws mus, evaporating, bursting, thiab ntws thiab permeating ntawm cov npuas dej ua npuas ncauj.
Cov laj thawj rau defoaming feem ntau muab faib ua ob yam: 1) qhov yooj yim-rau-siv thiab adsorbed defoamer molecules hloov cov foamer molecules, tsim cov yeeb yaj kiab tsis muaj zog; 2) cov defoamer molecules tshem tawm qhov chaw nyob ib sab thaum lub sij hawm kis txheej txheem Ib feem ntawm txheej txheej txheej ua rau cov kua nplaum ua npuas ncauj nyias, ua npuas ncauj stability yog txo, thiab nws yog ib qho yooj yim kom puas.
Los ntawm cov saum toj no peb tuaj yeem paub tias txhawm rau ua kom lub defoamer ua haujlwm, nws yuav tsum xub nkag mus rau hauv ob txheej txheej ntawm zaj duab xis npuas, thiab nws cov peev xwm nkag tau tuaj yeem qhia tau los ntawm kev nkag mus coefficient E. Tom qab lub defoamer nkag mus, nws xav tau. kom kis tau sai. Nws muaj peev xwm kis tau los ntawm kev sib kis coefficient S.
Hauv cov mis: γF yog qhov nro ntawm cov npuas nruab nrab; γDF yog qhov nro ntawm lub defoamer; γD yog qhov sib txuas ntawm qhov sib txuas ntawm cov npuas nruab nrab thiab cov defoamer. Thaum E> 0, lub defoamer tuaj yeem nkag mus rau hauv cov npuas dej; thaum E <0, lub defoamer tsis tuaj yeem nkag mus rau hauv cov npuas dej; thaum S> 0, lub defoamer tuaj yeem nthuav dav rau ntawm cov yeeb yaj kiab ua kua; thaum S <0 Lub defoamer tsis tuaj yeem kis tau rau ntawm cov yeeb yaj kiab ua kua. Yog li ntawd, tus neeg saib xyuas defoaming muaj qhov cuam tshuam tsuas yog thaum E> 0 thiab S> 0.
Post lub sij hawm: Dec-25-2019