HydroxyPropy cellulose (HPMC) yog qhov tseem ceeb tsim Additive uas tau siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog hauv cov khoom noj khoom haus kom haum thiab gypsum raws li cov ntaub ntawv. Raws li cov dej ua haujlwm tau txais txiaj ntsig zoo thiab cov tuab tuab, HPMC tuaj yeem txhim kho cov khoom siv hauv tsev, yog li kev txhim kho cov khoom tsim kho thiab cov khoom siv ruaj khov.
Tus qauv thiab kev ua tau zoo ntawm HPMC
HPMC yog cov kev ua haujlwm ntawm kev ua haujlwm ntawm xov tooj ntawm lub cev ua los ntawm cov tshuaj hloov kho ntuj hloov kho. Nws cov qauv molecular muaj ntau ntau ntawm cov pawg hydroxyl thiab methyl pawg los ntawm hydrogen bonds, ua hpmc mas hydrophilic thiab solubility. Hauv cov ntaub ntawv hauv tsev, HPMC tuaj yeem nqus thiab khaws cov nyiaj noo ntau, yog li txhim kho cov dej ua kom tiav cov khoom ua tau zoo.
Cov dej-tuav lub peev xwm ntawm HPMC feem ntau yog los ntawm nws cov qauv molecular tshwj xeeb. Nyob rau hauv cov kev daws teeb meem aqueous, HPMC Molecules tuaj yeem tsim ib qho cuab yeej sib npaug ntawm cov qauv network, khov kho "cov roj ntsha hauv nws thiab txo tus nqi ntawm cov dej poob. Qhov kev ua kom muaj txiaj ntsig cov dej no muaj qhov cuam tshuam tseem ceeb rau kev ua haujlwm ntawm cov ntaub ntawv tsim tsev thiab cov txiaj ntsig tsim.
Daim ntawv thov HPMC hauv cov ntaub ntawv tsim tsev
Caas culture: HPMC feem ntau yog lub luag haujlwm ntawm dej tuav thiab thickening hauv cov ntaub ntawv cement-raws. Nyob rau hauv centent cug, HPMC tuaj yeem txhim kho cov dej tshem tawm ntawm cov txheej txheej nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm nrawm ntawm cov cement. Qhov no tsis yog txuas ntxiv lub sijhawm ua haujlwm ntawm lub tshuaj khib, tab sis kuj tseem txhim kho lub zog ntawm lub zog thiab tawg ntawm cov tshuaj khib. Tsis tas li ntawd, HPMC txhim kho kev ua haujlwm ntawm lub tshuaj khib, ua kom nws yooj yim rau kev thov.
Cov khoom siv gypsum: hauv gypsum-based cov ntaub ntawv, lub luag haujlwm ntawm HPMC yog qhov tseem ceeb sib npaug. Cov ntaub ntawv gypsum yuav tsum muaj qee qhov dej ntawm cov txheej txheem hydration. Kev siv dej ntau dhau yuav ua rau tsis tiav ntawm cov gypsum, cuam tshuam nws lub zog thiab lub zog. HPMC muaj peev xwm ncua kev ncua ntawm Evaporation tus nqi thiab xyuas kom meej tias cov khoom siv gypsum tau muaj cov txheej txheem tawv me me, yog li kev txhim kho nws qhov kev ua tau zoo kawg nkaus.
Kev Ntsuas Tus Kheej Theem: Ntawm kev coj tus kheej hauv pem teb, HPMC siv nws cov dej khaws cia kom tsis txhob muaj dej noo thiab ua kom muaj kev ua tau zoo ntawm cov khoom siv tus kheej. Nyob rau tib lub sijhawm, HPMC tseem tuaj yeem txhim kho qhov tawg tsis kam ntawm cov khoom thiab tiv thaiv hauv pem teb los ntawm kev tawg.
Ceramic pobzeb nplaum thiab caulking cov neeg sawv cev: ntawm cov ceramic pobzeb adentive ntawm cov txheej txheem kev tsim kho, yog li ua kom muaj zog dhau los thaum lub zog ua kom muaj zog thiab ua kom cov nplaum. Kev sib tw ntawm cov neeg sawv cev sib koom tes. Ib qho ntxiv, HPMC tseem tuaj yeem txhim kho cov nplais tsis kam ntawm cov ntaub ntawv no, ua rau nws yooj yim dua los kho txoj haujlwm ntawm cov txheej txheem pasting, ua kom yooj yim ntawm kev tsim kho.
Lub taub dej ua kom ceev dua HPMC yog ua tiav tau los ntawm cov hauv qab no:
Thickening cov nyhuv: HPMC tuaj yeem nce viscosity ntawm cov ntaub ntawv tsev thiab ua ib qho qauv viscous. Lub kaw lus no muaj peev xwm ua tau zoo siv cov dej ntws, yog li txo cov evaporation thiab kev nqus tus nqi ntawm cov dej. Hauv qhov kub thiab txias lossis huab cua qhuav ib puag ncig, cov nyhuv tuab ntawm HPMC yog qhov tseem ceeb tshwj xeeb thiab tuaj yeem txhim kho cov dej ua kom ua tau zoo ntawm cov khoom.
Cov kev ua si saum npoo: HPMC muaj cov kev ua si saum npoo thiab tuaj yeem tsim zaj duab xis tiv thaiv nyob rau saum npoo ntawm Maas hais lossis lwm yam khoom siv tau. Qhov kev tiv thaiv kev tiv thaiv no tsuas yog tiv thaiv ya raws ntau dhau, tab sis kuj tseem muaj zog hauv lub zog thiab lub zog kav cov khoom siv.
Hydration: Cov pab pawg hydroxyl hauv HPMC lwg me me muaj peev xwm tsim cov khoom siv hydrogen nrog cov roj av, yog li txhim kho cov khoom siv dej-tuav lub peev xwm. Cov quav las no tso cai HPMC kom tau txais cov dej noo thiab maj mam tso tawm dej thaum cov txheej txheem tawv ntawm cov khoom siv hydration ntawm cov khoom siv.
Lub sijhawm qhib qhib ncua sijhawm: HPMC cov khoom siv dej txuas ntxiv lub sijhawm qhib lub tsev, uas yog li cas cov khoom siv nyob ntev thaum kev tsim kho. Qhov no tseem ceeb tshwj xeeb tshaj yog rau cov haujlwm tsim kho loj lossis cov chaw ua haujlwm nyuaj, raws li nws tuaj yeem txhim kho kev siv tau zoo thiab txo cov nqi ua haujlwm.
Qhov tseem ceeb ntawm HPMC hauv dej tuav
Hauv kev tsim kho niaj hnub, dej khaws cia yog ib qho ntawm cov ntsiab lus tseem ceeb cuam tshuam rau kev ua tau zoo ntawm cov ntaub ntawv tsim tsev. Tshwj xeeb tshaj yog nyob rau hauv qhuav lossis siab-qhov chaw khaws cia ntawm cov khoom tsim tsev yog hais txog kev tsim kho cov nyhuv thiab kev ua tau zoo kawg nkaus ntawm cov khoom siv. Raws li cov dej uas tau khaws cov dej ua ke, HPMC tuaj yeem txhim kho cov dej hauv tsev, yog li txhim kho kev ua haujlwm zoo thiab cov khoom siv ruaj khov.
HPMC ua si lub luag haujlwm tseem ceeb hauv kev tuav hauv cov ntaub ntawv hauv tsev los ntawm nws cov qauv molecular thiab ntau yam kev ua haujlwm. Qhov no tsis tsuas yog txhim kho cov kev tsim kho ntawm cov khoom siv, tab sis kuj tseem ua kom muaj kev ua tau zoo thiab kev pabcuam lub neej ntawm lub tsev. Yog li ntawd, HPMC tau dhau los ua qhov tsis tseem ceeb thiab tseem ceeb ntxiv hauv kev tsim kho niaj hnub.
Lub Sijhawm Post: Feb-17-2025