1. Txheej txheem cej luam ntawm methyl hydroxyethyl cellulose (MHEC)
Methyl hydroxyethyl cellulose (MHEC) yog ib qho uas tsis yog-ionic cellulose ether tau los ntawm kev hloov kho methylation los ntawm hydroxyethyl cellulose. Vim nws cov qauv molecular tshwj xeeb, MHEC muaj qhov zoo solubility, thickening, adhesion, film-forming thiab deg kev ua si, thiab tau dav siv nyob rau hauv coatings, tsev cov ntaub ntawv, tshuaj niaj hnub thiab lwm yam teb.
2. Txheej txheem cej luam ntawm cov xim strippers
Xim strippers yog cov tshuaj npaj siv los tshem tawm cov coatings xws li hlau, ntoo, thiab yas. Traditional xim strippers feem ntau vam khom hnyav hnyav, xws li dichloromethane thiab toluene. Txawm hais tias cov tshuaj no muaj txiaj ntsig zoo, lawv muaj teeb meem xws li kev kub ntxhov siab, toxicity thiab kev phom sij ib puag ncig. Nrog rau cov kev cai nruj ib puag ncig thiab kev txhim kho ntawm kev ua haujlwm ib puag ncig, cov xim dej thiab cov xim tsis muaj tshuaj lom tau maj mam dhau los ua lub hauv paus ntawm kev ua lag luam.
3. Mechanism of action of MHEC nyob rau hauv cov xim strippers
Nyob rau hauv cov xim strippers, MHEC plays lub luag hauj lwm tseem ceeb raws li ib tug thickener thiab rheology modifier:
Thickening nyhuv:
MHEC muaj cov nyhuv thickening zoo hauv cov txheej txheem dej. Los ntawm kev kho cov viscosity ntawm cov xim stripper, MHEC tuaj yeem ua rau cov xim stripper ua raws li ntsug lossis inclined nto yam tsis muaj sagging. Cov cuab yeej no tseem ceeb tshwj xeeb thaum siv cov xim strippers vim nws tso cai rau cov xim stripper nyob twj ywm ntawm lub hom phiaj ntev, yog li txhim kho cov xim stripping nyhuv.
Stabilize lub ncua kev kawm ntawv system:
Cov xim strippers feem ntau muaj ntau yam khoom xyaw, uas yuav ua rau stratify los yog khom thaum khaws cia. Los ntawm kev txhim kho cov txheej txheem viscosity ntawm cov tshuaj, MHEC tuaj yeem tiv thaiv cov sedimentation ntawm cov khoom siv, tswj cov khoom sib txawv ntawm cov khoom xyaw, thiab xyuas kom muaj kev ruaj ntseg ntawm cov xim stripper.
Kho cov khoom rheological:
Kev siv cov xim strippers xav tau tias nws muaj cov khoom zoo rheological, uas yog, nws tuaj yeem ntws zoo thaum siv zog sab nraud, tab sis tuaj yeem ua kom tuab sai thaum tsis khov. Lub molecular saw qauv ntawm MHEC muab nws zoo shear thinning zog, uas yog, ntawm siab shear tus nqi, lub viscosity ntawm cov tshuaj yuav txo, ua rau cov xim stripper yooj yim mus thov; Thaum nyob rau hauv qis shear tus nqi los yog nyob rau hauv ib tug zoo li qub, cov tshuaj viscosity yog siab, uas yuav pab tau cov khoom tsim ib tug uniform txheej ntawm lub hom phiaj nto.
Txhawb kev tsim zaj duab xis:
Thaum lub sij hawm cov txheej txheem xim stripping, MHEC tuaj yeem pab cov xim stripper tsim cov yeeb yaj kiab zoo ib yam ntawm lub hom phiaj. Cov yeeb yaj kiab no tuaj yeem tsis tsuas yog ncua lub sijhawm ua haujlwm ntawm cov khoom xyaw nquag, tab sis kuj txhim kho lub peev xwm npog ntawm cov xim stripper rau qee yam, kom nws tuaj yeem nkag mus rau txhua qhov chaw ntawm txheej txheej.
4. Yuav siv MHEC li cas hauv cov xim strippers
Kev npaj cov tshuaj aqueous:
MHEC feem ntau muaj nyob rau hauv daim ntawv hmoov thiab yuav tsum tau npaj rau hauv cov kua dej ua ntej siv. Txoj kev xyaum yog maj mam ntxiv MHEC rau cov dej nplawm kom tsis txhob muaj kev sib txuam. Nws yuav tsum tau muab sau tseg tias solubility ntawm MHEC yuav cuam tshuam los ntawm dej kub thiab pH nqi. Cov dej kub siab dua (50-60 ℃) tuaj yeem ua kom cov txheej txheem tawg ntawm MHEC, tab sis kub dhau heev yuav cuam tshuam rau nws cov viscosity kev ua haujlwm.
Mixed rau hauv cov xim strippers:
Thaum npaj cov xim strippers, MHEC aqueous tov feem ntau yog maj mam ntxiv rau cov xim stripper puag kua hauv qab nplawm. Txhawm rau kom ntseeg tau tias qhov sib txawv tsis sib xws, qhov sib ntxiv ntawm MHEC yuav tsum tsis txhob nrawm dhau, thiab sib tov yuav tsum txuas ntxiv mus kom txog thaum tau txais cov tshuaj sib xws. Cov txheej txheem no yuav tsum tau tswj lub nplawm nrawm kom tsis txhob tsim cov npuas.
Kev hloov ntawm cov mis:
Tus nqi ntawm MHEC hauv cov xim strippers feem ntau yog kho raws li cov qauv tshwj xeeb thiab lub hom phiaj kev ua tau zoo ntawm cov xim strippers. Tus nqi sib ntxiv yog nruab nrab ntawm 0.1% -1%. Cov nyhuv thickening muaj zog heev tuaj yeem ua rau cov txheej tsis sib xws lossis cov viscosity ntau dhau, thaum cov tshuaj tsis txaus yuav tsis ua tiav qhov zoo tshaj plaws viscosity thiab rheological zog, yog li nws yog qhov tsim nyog los ua kom zoo dua nws cov kev siv los ntawm kev sim.
5. Qhov zoo ntawm MHEC hauv cov xim strippers
Kev nyab xeeb thiab kev tiv thaiv ib puag ncig:
Piv nrog rau cov tsoos thickeners, MHEC yog ib qho uas tsis yog-ionic cellulose ether, tsis muaj cov tshuaj lom thiab tsim kev puas tsuaj, muaj kev nyab xeeb dua rau tib neeg lub cev thiab ib puag ncig, thiab yog nyob rau hauv txoj kab nrog txoj kev loj hlob ntawm niaj hnub ntsuab chemistry.
Kev ruaj ntseg zoo: MHEC muaj cov tshuaj lom neeg ruaj khov zoo nyob rau hauv qhov dav pH (pH 2-12), tuaj yeem tuav cov nyhuv tuab ruaj khov hauv ntau cov xim stripper tshuab, thiab tsis yooj yim cuam tshuam los ntawm lwm cov khoom hauv lub cev.
Kev sib raug zoo: Vim yog qhov tsis yog-ionic ntawm MHEC, nws yog qhov zoo sib xws nrog cov khoom xyaw nquag, yuav tsis cuam tshuam lossis ua rau lub cev tsis ruaj khov, thiab haum rau ntau hom xim stripper formulations.
Cov nyhuv thickening zoo: MHEC tuaj yeem muab cov nyhuv thickening tseem ceeb, yog li txo cov nqi ntawm lwm cov thickeners hauv cov xim stripper, ua kom yooj yim cov qauv thiab txo cov nqi.
Methyl hydroxyethyl cellulose (MHEC) tau dav siv nyob rau hauv niaj hnub cov xim strippers vim nws zoo heev thickening, stability thiab compatibility. Los ntawm kev tsim qauv thiab siv cov qauv tsim nyog, MHEC tuaj yeem txhim kho kev ua tau zoo ntawm cov xim strippers, ua rau lawv pom kev ua haujlwm zoo dua thiab kev tiv thaiv ib puag ncig hauv kev siv tswv yim. Nyob rau hauv lub neej yav tom ntej, nrog kev txhim kho txuas ntxiv ntawm cov xim stripper thev naus laus zis thiab kev txhim kho ntxiv ntawm kev tiv thaiv ib puag ncig, daim ntawv thov kev cia siab ntawm MHEC hauv cov xim strippers yuav dav dua.
Post lub sij hawm: Jun-14-2024