Hydroxypropyl Methylcellulose (HPMC)yog ib qho cellulose ether uas tsis yog ionic. Vim nws cov khoom siv lub cev thiab tshuaj zoo heev, nws yog siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog ua ib qho khoom ntxiv tseem ceeb hauv cov ntaub ntawv gypsum. Daim ntawv thov ntawm HPMC hauv gypsum binder feem ntau yog pom tseeb hauv kev txhim kho kev ua haujlwm ntawm kev tsim kho, txhim kho kev nplaum, ncua sijhawm qhib, kho qhov khaws cia dej thiab txhim kho kev ua haujlwm tag nrho ntawm cov ntaub ntawv.
1. Txhim kho kev ua haujlwm ntawm kev tsim kho
Hauv cov khoom siv gypsum xws li gypsum mortar lossis gypsum putty, qhov ntxiv ntawm HPMC ua rau cov khoom siv ua haujlwm tau zoo dua. Nws cov roj nplua nyeem thiab plasticity zoo heev ua rau cov khoom siv gypsum sib xyaw muaj kev ywj pheej zoo dua thiab yooj yim siv. HPMC tuaj yeem sib kis tau zoo thaum lub sijhawm sib tov, qhwv cov khoom khov, ua rau cov mortar tag nrho muaj kev sib xws zoo dua thiab ua haujlwm tau zoo dua, ua rau nws yooj yim dua rau cov neeg ua haujlwm hauv kev tsim kho kom ua haujlwm, thiab txhim kho kev ua haujlwm zoo thiab kev tsim kho zoo.
2. Txhim kho kev khaws dej
HPMC muaj peev xwm nqus tau thiab tuav dej, uas yog ib qho ntawm nws cov yam ntxwv tseem ceeb tshaj plaws. Hauv cov ntaub ntawv gypsum, kev khaws dej yog qhov qhia tseem ceeb uas cuam tshuam rau qhov ceev thiab kev txhim kho lub zog. Txij li thaum qhov tawv ntawm gypsum nyob ntawm qhov kev ua kom dej noo, yog tias cov dej qhuav ua ntej ua ntej qhov kev ua kom dej noo lossis raug nqus los ntawm txheej hauv paus, gypsum yuav tsis tau hydrated tag nrho, ua rau muaj teeb meem xws li hmoov thiab tawg. HPMC tsim ib txheej ntawm viscoelastic zaj duab xis los qhwv cov dej, ua kom qeeb qhov poob dej, xyuas kom meej qhov kev ua tiav ntawm qhov kev ua kom dej noo ntawm gypsum, thiab yog li txhim kho qhov ceev thiab kev ruaj khov ntawm cov khoom tiav.
3. Ntev lub sijhawm qhib thiab kho lub sijhawm teeb tsa
HPMC kuj muaj cov nyhuv tswj hwm rau lub sijhawm teeb tsa ntawm gypsum. Los ntawm kev tswj nws cov nyiaj ntxiv, qhov ceev teeb tsa ntawm gypsum tuaj yeem ncua, muab sijhawm rau cov neeg ua haujlwm tsim kho kom txaus, uas yog qhov tshwj xeeb tshaj yog rau thaj chaw loj ntawm plastering thiab txheej ntawm cov qauv nyuaj. Ntev lub sijhawm qhib txhais tau tias cov khoom yuav tsis poob dej thiab tawg sai sai thaum lub sijhawm tsim kho, uas pab txhim kho qhov sib xws thiab cov txiaj ntsig zoo nkauj ntawm cov khoom tiav. Tib lub sijhawm, nws kuj tseem pab tswj cov txheej txheem tsim kho tshuab thiab txhim kho kev ua haujlwm ntawm kev tsim kho.
4. Txhim kho lub zog sib txuas
HPMC muaj cov yam ntxwv zoo ntawm kev tsim zaj duab xis. Cov qauv zaj duab xis polymer organic uas tsim thaum lub sijhawm ua kom tawv ntawm gypsum tuaj yeem txhim kho kev sib txuas ntawm nws thiab lub substrate. Zaj duab xis no tsis yog tsuas yog txhim kho kev sib txuas ntawm ntau theem hauv cov khoom siv, tab sis kuj tseem txhim kho kev sib txuas ntawm cov gypsum mortar thiab txheej hauv paus (xws li phab ntsa cib, pob zeb, thiab lwm yam), yog li txo cov teeb meem zoo ntawm kev tsim kho xws li kev plhaub thiab hollowing. Tshwj xeeb tshaj yog thaum siv rau txheej putty, HPMC tuaj yeem txhim kho nws cov kev ua tau zoo ntawm kev sib txuas thiab ua rau nws ruaj khov thiab txhim khu kev qha.
5. Kev ua tau zoo tiv thaiv kev plam
Thaum lub sijhawm tsim phab ntsa ntsug, tshwj xeeb tshaj yog nyob rau hauv cov nplais nplaum lossis cov txheej gypsum plaster, qhov ntxiv ntawm HPMC ua rau muaj peev xwm tiv thaiv kev plam ntawm cov khoom. Vim tias nws ua rau thixotropy ntawm cov slurry, uas yog, nws muaj cov kua dej zoo nyob rau hauv kev sib xyaw thiab muaj zog viscosity nyob rau hauv cov xwm txheej zoo li qub, nws tuaj yeem txhawb nqa qhov ruaj khov ntawm cov khoom ntawm phab ntsa thiab tiv thaiv cov khoom los ntawm kev plam. Qhov no yog qhov kev lees paub tseem ceeb heev rau kev khawb phab ntsa thiab kev ua haujlwm caulking.
6. Txhim kho qhov tawg tsis kam thiab ua kom ruaj khov
Vim yog HPMC tswj tau dej zoo, cov tshuaj hydration ntawm gypsum txaus dua thaum lub sijhawm ua kom tawv, yog li tsim cov khoom siv crystalline hydration ntau dua thiab txhim kho qhov ceev ntawm cov qauv. Cov qauv polymer network tsim los ntawm HPMC pab txo qhov kev ntxhov siab sab hauv los ntawm kev ntsws lossis thermal nthuav dav thiab kev cog lus, txo qhov kev pheej hmoo ntawm kev tawg, thiab txhim kho qhov ruaj khov ntawm cov khoom tiav. Tib lub sijhawm, nws muaj qee qhov kev ywj pheej, uas txhim kho qhov cuam tshuam thiab kev tawg tsis kam ntawm cov khoom gypsum.
7. Hloov kho rau ntau yam gypsum systems
HPMC siv tau dav hauv ntau yam khoom gypsum, suav nrog β gypsum, α gypsum, desulfurized gypsum, thiab lwm yam, thiab qhia tau tias muaj kev sib raug zoo thiab ruaj khov hauv ntau lub tshuab. Nws kuj muaj kev sib koom tes zoo ntawm cov khoom sib xyaw thiab cov khoom ntxiv, uas tuaj yeem pab cov kws tsim qauv kho cov khoom ua tau zoo raws li qhov xav tau tiag tiag thiab paub txog kev txhim kho raws li tus kheej.
Ua ib qho khoom siv ua haujlwm zoo,HPMC ua lub luag haujlwm zoo ntau yam hauv cov gypsum binders.Nws tsis yog tsuas yog txhim kho cov khoom siv lub cev ntawm gypsum, xws li kev ua haujlwm tau zoo, kev khaws dej, kev nplaum, thiab lwm yam, tab sis kuj tseem txhim kho lub neej ua haujlwm thiab qhov zoo ntawm cov khoom gypsum. Nrog rau kev txhawb nqa tob ntawm cov ntaub ntawv tsim kho ntsuab thiab cov tswv yim txuag hluav taws xob thiab kev tiv thaiv ib puag ncig, HPMC yuav ua lub luag haujlwm tseem ceeb hauv kev lag luam ntawm cov khoom gypsum thiab cov tshuaj sib xyaw qhuav yav tom ntej, thiab yog ib qho ntawm cov khoom siv tseem ceeb rau cov ntaub ntawv tsim kho niaj hnub.
Lub sijhawm tshaj tawm: Tsib Hlis-20-2025