qhia:
Methylhydroxyethylcellulose (MHEC) yog ntau yam cellulose ether siv dav hauv ntau lub lag luam vim nws cov dej tuav tau zoo thiab cov khoom nplaum.MHEC yog muab los ntawm ntuj cellulose thiab tau pom cov ntawv thov hauv kev tsim kho, tshuaj, khoom noj thiab tshuaj pleev ib ce.
Chemical structure thiab properties:
MHEC yog methyl-substituted hydroxyethylcellulose derivative nrog ib tug tshwj xeeb molecular qauv.Cov pob txha cellulose muab cov khoom siv biodegradability thiab ib puag ncig sib raug zoo, ua rau MHEC thawj qhov kev xaiv rau ntau daim ntawv thov.Hydroxyethyl thiab methyl pawg txhim kho nws cov solubility thiab hloov nws lub cev thiab tshuaj lom neeg, muab ntau yam haujlwm.
Dej tuav mechanism:
Ib qho ntawm cov cwj pwm tseem ceeb ntawm MHEC yog nws cov dej tuav tau zoo heev.Hauv kev tsim cov ntaub ntawv xws li mortars thiab cement-based khoom, MHEC ua raws li tus neeg saib xyuas dej, tiv thaiv kev poob dej sai thaum lub sijhawm kho.Qhov no yog qhov tseem ceeb los tswj kev ua kom zoo tshaj plaws, txhim kho adhesion thiab txhim kho tag nrho cov khoom siv.
MHEC ua tiav kev tuav dej los ntawm ntau lub tshuab:
Hydrophilicity: Qhov dej hydrophilic ntawm MHEC ua rau nws nqus thiab khaws cov dej molecules.Cov pob txha cellulose, ua ke nrog cov pawg hydroxyethyl thiab methyl, tsim cov qauv muaj peev xwm khaws cov dej hauv nws cov matrix.
Zaj duab xis-forming zog: MHEC tuaj yeem tsim ib zaj duab xis nyias, hloov tau yooj yim thaum tawg hauv dej.Cov yeeb yaj kiab ua raws li kev thaiv, txo cov dej evaporation thiab muab cov txheej txheem tiv thaiv kom muaj dej noo hauv cov khoom.
Thickening nyhuv: Txij li thaum MHEC swells hauv dej, nws nthuav tawm cov nyhuv thickening.Qhov no nce viscosity txhawb nqa dej kom zoo dua qub, tiv thaiv dej los ntawm kev sib cais ntawm cov khoom thiab tswj kom muaj kev sib xyaw ua ke.
Kev siv hauv kev tsim kho:
Kev tsim kho kev lag luam vam khom rau MHEC rau nws cov khoom tuav dej.MHEC tau txais txiaj ntsig mortar, grout thiab lwm yam khoom siv cementitious los ntawm kev txhim kho kev ua haujlwm, txo kev tawg thiab txhim kho adhesion.Tsis tas li ntawd, MHEC pab txhawb kev siv thiab txau cov ntaub ntawv hauv tsev, ua rau nws muaj txiaj ntsig zoo hauv kev tsim kho niaj hnub no.
Adhesive zog:
Ntxiv nrog rau kev tuav dej, MHEC ua lub luag haujlwm tseem ceeb hauv kev txhim kho adhesion hauv ntau yam kev siv.Nws cov khoom nplaum muaj txiaj ntsig tshwj xeeb hauv kev lag luam hauv qab no:
Pobzeb Adhesives: MHEC feem ntau yog siv rau hauv cov pobzeb nplaum los txhim kho lub zog ntawm cov pobzeb thiab cov substrate.Nws tsim cov yeeb yaj kiab hloov tau yooj yim thiab txhim kho kev ua haujlwm, ua kom muaj kev ruaj khov thiab ua haujlwm ntev.
Wallpaper Pasting: Hauv kev tsim cov wallpaper pasting, MHEC pab ua kom cov ntawv ntsa rau phab ntsa.Nws tiv thaiv cov paste los ntawm ziab tawm ntxov ntxov thiab txhawb kom muaj kev ruaj khov thiab ua haujlwm ntev.
Joint Compounds: MHEC yog siv nyob rau hauv kev sib xyaw ua ke vim nws cov khoom sib txuas thiab thickening.Nws pab ua kom tiav qhov du thiab nplaum tiav hauv daim ntawv thov drywall.
nyob rau hauv xaus:
Methylhydroxyethylcellulose (MHEC) yog lub ntsej muag cellulose ether nrog cov dej tuav tau zoo thiab cov khoom nplaum.Nws cov qauv molecular tshwj xeeb, hydrophilicity, zaj duab xis-tsim muaj peev xwm thiab thickening nyhuv ua rau nws dav siv nyob rau hauv ntau yam lag luam.Los ntawm cov khoom siv hauv tsev mus rau cov tshuaj thiab tshuaj pleev ib ce, MHEC ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov khoom lag luam thiab ua kom pom kev ua haujlwm zoo.Raws li kev lag luam txuas ntxiv mus nrhiav kev daws teeb meem zoo ib puag ncig thiab muaj txiaj ntsig, MHEC tseem yog qhov kev xaiv muaj txiaj ntsig thiab muaj txiaj ntsig zoo rau ntau yam kev siv.
Lub sij hawm xa tuaj: Dec-11-2023