MHEC, lossis methylhydroxyethylcellulose, yog ib qho tshuaj lom neeg tseem ceeb uas siv dav hauv cov ntaub ntawv tsim kho. Tshwj xeeb tshaj yog hauv cov txheej thiab cov ntaub ntawv tiav xws li putty thiab plaster, lub luag haujlwm ntawm MHEC yog qhov tseem ceeb heev.
1. Kev ua tau zoo ntawm MHEC hauv putty
Putty yog ib yam khoom siv los sau cov phab ntsa tsis sib npaug lossis lwm qhov chaw. Nws yuav tsum muaj kev ua haujlwm zoo, muaj zog thiab ruaj khov. Daim ntawv thov MHEC hauv putty feem ntau suav nrog cov hauv qab no:
a. Cov nyhuv ua kom tuab
MHEC tuaj yeem ua rau kom cov putty viscosity ntau dua thiab txhim kho nws cov fluidity thiab kev ua haujlwm ntawm kev tsim kho. Qhov thickening effect no tuaj yeem pab tswj qhov sib xws ntawm cov putty, ua rau nws yooj yim rau kev siv thiab tswj kom muaj qhov tuab zoo ntawm cov nto ntsug yam tsis muaj sagging. Kev thickening kom raug kuj tseem tuaj yeem txhim kho qhov kev ua haujlwm tiv thaiv kev sagging ntawm putty, ua rau kev tsim kho yooj yim dua.
b. Kev khaws dej
MHEC muaj peev xwm khaws dej tau zoo, uas yog qhov tseem ceeb rau kev ua haujlwm ntawm cov putty. Putty siv sijhawm ntev kom qhuav thiab tawv tom qab siv. Yog tias cov dej noo poob sai dhau, nws yuav ua rau qhov chaw ntawm putty tawg lossis ua hmoov. MHEC tuaj yeem tsim cov zaj duab xis khaws dej hauv putty thiab qeeb qeeb qhov dej evaporation, yog li ua kom cov putty qhuav sib npaug, txo qhov tsim ntawm cov kab nrib pleb, thiab txhim kho qhov zoo ntawm cov khoom tiav.
c. Txhim kho kev sib txuas
MHEC tuaj yeem txhim kho qhov kev nplaum ntawm cov putty, ua rau nws nplaum ntau dua ntawm ntau yam substrates. Qhov no yog qhov tseem ceeb rau kev ruaj khov thiab kev ua haujlwm ntev ntawm cov txheej putty. Kev nplaum zoo tsis tsuas yog tiv thaiv cov putty kom tsis txhob poob, tab sis kuj ua rau kom cov putty tiv taus kev cuam tshuam thiab ntev nws lub neej kev pabcuam.
2. Kev ua tau zoo ntawm MHEC hauv gypsum
Gypsum yog ib yam khoom siv hauv tsev uas siv ntau heev, nws tiv taus hluav taws zoo thiab kho kom zoo nkauj. Lub luag haujlwm ntawm MHEC hauv gypsum tsis tuaj yeem tsis quav ntsej. Nws cov yam ntxwv tseem ceeb yog raws li nram no:
a. Txhim kho kev ua haujlwm ntawm cov txheej txheem
MHEC txhim kho cov khoom siv ua plaster, ua rau nws yooj yim dua rau kev sib tov thiab nthuav. Los ntawm kev kho qhov viscosity thiab kev sib xws ntawm gypsum slurry, MHEC tuaj yeem pab cov neeg ua haujlwm tsim kho kom zoo dua tswj tau qhov ntau thiab tuab ntawm gypsum siv. Qhov no muaj txiaj ntsig zoo rau kev txhim kho kev ua haujlwm ntawm kev tsim kho thiab qhov tiaj tiaj ntawm cov khoom tiav.
b. Txhim kho qhov tsis kam tawg
Cov plaster feem ntau yuav tawg thaum lub sijhawm ua kom tawv, uas tuaj yeem cuam tshuam rau nws qhov tsos thiab kev ua tau zoo. Kev ua tau zoo ntawm kev khaws dej ntawm MHEC tuaj yeem ua rau qeeb qeeb ntawm qhov dej evaporation hauv gypsum, txo qhov kev tsim ntawm kev ntxhov siab sab hauv, yog li txo qhov tshwm sim ntawm kev tawg. Tsis tas li ntawd, MHEC tuaj yeem txhim kho qhov yooj ywm ntawm plaster, ua rau nws tiv taus kev nyuaj siab sab nraud.
c. Txhim kho qhov du ntawm qhov chaw
Kev siv MHEC hauv gypsum kuj tseem tuaj yeem txhim kho nws qhov du thiab ua rau cov khoom gypsum zoo nkauj dua. Qhov chaw du tsis yog tsuas yog muaj cov txiaj ntsig zoo nkauj xwb, tab sis kuj muab lub hauv paus zoo dua rau kev nplaum xim, uas ua rau cov txheej txheem pleev xim tom qab yooj yim dua.
Ua ib qho khoom siv ntxiv rau hauv kev tsim kho tseem ceeb, MHEC qhia tau ntau yam khoom zoo dua thaum siv rau hauv putty thiab gypsum. Nws tsis tsuas yog tuaj yeem txhim kho kev ua haujlwm ntawm kev tsim kho, txhim kho kev nplaum thiab kev khaws dej ntawm cov ntaub ntawv, tab sis kuj tseem txhim kho qhov tsis kam tawg thiab qhov zoo ntawm cov khoom tiav. Cov khoom no tau ua rau MHEC siv dav hauv kev lag luam kev tsim kho, ua ib qho tseem ceeb ntawm cov ntaub ntawv xws li putty thiab plaster. Yav tom ntej, nrog rau kev txhim kho cov thev naus laus zis kev tsim kho thiab kev txhim kho cov kev xav tau ntawm cov khoom siv, kev cia siab ntawm daim ntawv thov ntawm MHEC yuav dav dua.
Lub sijhawm tshaj tawm: Lub Yim Hli-01-2024