Hydroxypropyl methylcellulose (HPMC) yog ib qho polymer compound feem ntau siv rau hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog hauv gypsum facing plaster, qhov twg nws ua lub luag haujlwm tseem ceeb. Ua ib qho additive, HPMC tuaj yeem txhim kho kev ua haujlwm, kev khaws dej thiab kev nplaum ntawm gypsum facing plaster, yog li nws yog dav siv rau hauv kev tsim kho thiab kho kom zoo nkauj.
1. Cov yam ntxwv tseem ceeb ntawm HPMC
HPMC yog ib qho cellulose ether uas tsis yog ionic nrog cov khoom zoo solubility hauv dej thiab thickening. Nws tuaj yeem yaj sai hauv dej los ua cov kua colloidal sib xws, thiab muaj kev nplaum zoo, lubricity, zaj duab xis tsim thiab khaws dej. Cov yam ntxwv no ua rau HPMC siv dav hauv cov ntaub ntawv tsim kho, tshwj xeeb tshaj yog rau kev siv hauv cov ntaub ntawv gypsum.
Cov yam ntxwv tseem ceeb ntawm HPMC suav nrog cov hauv qab no:
Kev khaws dej: HPMC tuaj yeem khaws cov dej noo hauv gypsum ntsib plaster, yog li ntawd ntev lub sijhawm qhib thiab lub sijhawm ua haujlwm ntawm cov khoom.
Ua kom tuab: Ua ib qho thickener, HPMC tuaj yeem ua rau kom cov plaster viscosity nce ntxiv, tiv thaiv kev sagging, thiab txhim kho kev txhuam.
Lubricity: Cov khoom siv lubricating ntawm HPMC txhim kho qhov kev xav ntawm kev tuav plaster thiab ua rau kev tsim kho yooj yim dua.
Cov khoom tsim zaj duab xis: Nws tuaj yeem tsim ib zaj duab xis tiv thaiv rau ntawm qhov chaw ntawm plaster, txhim kho qhov tawg tsis kam ntawm plaster.
2. Txoj kev ua haujlwm ntawm HPMC hauv gypsum ntsib plaster
Tom qab ntxiv HPMC rau gypsum ntsib plaster, cov khoom siv tau zoo dua feem ntau hauv cov hauv qab no:
Txhim kho kev khaws dej: Thaum lub sijhawm tsim kho ntawm gypsum ntsib plaster, yog tias dej poob sai dhau, nws yuav ua rau tsis sib xws, tawg thiab txo qis zog. HPMC tuaj yeem tsim cov zaj duab xis zoo hauv plaster, qeeb qeeb qhov dej evaporation, yog li ntawd plaster tuaj yeem khaws dej txaus thaum lub sijhawm ziab, xyuas kom meej tias nws cov tawv sib xws, yog li zam kev tsim cov kab nrib pleb.
Txhim kho kev nplaum: HPMC tuaj yeem tsim ib zaj duab xis nyias nyias ntawm qhov chaw ntawm plaster, uas tuaj yeem txhim kho qhov nplaum thaum sib cuag nrog qhov chaw ntawm lub substrate, yog li qhov nplaum ntawm plaster ntawm phab ntsa nce ntxiv. Tshwj xeeb tshaj yog rau ntawm cov khoom siv porous thiab qhuav, cov dej khaws cia ntawm HPMC kuj tseem tuaj yeem tiv thaiv cov khoom siv los ntawm kev nqus dej sai dhau, yog li txhim kho qhov sib txuas.
Txhim kho kev tiv thaiv kab nrib pleb: Gypsum ntsib plaster yog qhov yooj yim rau cov kab nrib pleb shrinkage vim muaj kev hloov pauv ntawm qhov kub thiab txias thiab av noo.HPMC ua rau qeeb qeeb qhov kev ziab ntawm cov dej los ntawm kev kho qhov kev ua kom qhuav ntawm cov dej, yog li ntawd txo qhov kev pheej hmoo ntawm kev tawg hauv cov txheej plaster. Tib lub sijhawm, cov zaj duab xis colloid tsim los ntawm HPMC kuj tseem tuaj yeem muab qee yam kev tiv thaiv kev tawg rau cov plaster.
Txhim kho kev ua haujlwm tau zoo: HPMC tuaj yeem ua rau kom cov nplaum nplaum thiab cov yas ntawm cov plaster nce ntxiv, ua rau nws yooj yim dua rau kev ua haujlwm thaum txhuam thiab sib npaug. HPMC txhim kho kev ua haujlwm ntawm cov plaster, thiab cov neeg ua haujlwm hauv kev tsim kho tuaj yeem tswj tau qhov tuab thiab qhov tiaj tiaj kom raug dua, uas pab kom tau txais cov txiaj ntsig zoo dua.
3. HPMC txhim kho kev ua tau zoo ntawm gypsum facing plaster
Qhov ntxiv ntawm HPMC muaj ntau yam kev txhim kho ntawm kev ua tau zoo ntawm gypsum facing plaster, suav nrog:
Kev txhim kho rheological: HPMC tuaj yeem ua rau kom muaj viscosity ntawm lub plaster, tswj qhov fluidity ntawm lub plaster, tiv thaiv cov teeb meem sagging, thiab txhim kho kev txhuam hniav ntawm lub plaster.
Txhim kho kev tiv thaiv te: Cov zaj duab xis colloid tsim los ntawm HPMC muaj kev tiv thaiv ntawm plaster rau qee qhov, tiv thaiv cov plaster kom tsis txhob khov thiab tawg hauv qhov kub qis, thiab txhim kho cov khoom siv tiv thaiv te.
Kev tiv thaiv kev ntsws zoo dua:HPMC ua rau cov dej noo hauv cov plaster nce ntxiv, txo qhov teeb meem shrinkage los ntawm dej evaporation, thiab ua rau cov txheej plaster ruaj khov dua thiab tsis tshua muaj kev tawg.
Kev nplaum zoo dua: Cov khoom sib txuas ntawm HPMC tuaj yeem txhim kho qhov nplaum ntawm lub plaster rau ntawm qhov chaw ntawm lub substrate, ua rau cov txheej tsis tshua poob.
4. Kev ceev faj hauv kev siv HPMC
Txawm hais tias HPMC muaj ntau qhov zoo rau gypsum ntsib plaster, cov hauv qab no yuav tsum tau sau tseg hauv nws siv:
Kev tswj tus nqi ntxiv: Kev ntxiv HPMC ntau dhau yuav ua rau cov plaster nplaum dhau, ua rau nws nyuaj rau du, cuam tshuam rau qhov kev tsim kho. Feem ntau hais lus, tus nqi ntxiv ntawm HPMC yuav tsum tau tswj hwm hauv qhov ntau ntawm 0.1% -0.5%, thiab kho raws li qhov xav tau tiag tiag.
Kev sib xyaw ua ke:HPMC yuav tsum tau do kom tag nrho thaum sib xyaw nrog cov ntaub ntawv xws li gypsum kom ntseeg tau tias muaj kev sib kis zoo thiab kev ua haujlwm zoo sib xws. HPMC tuaj yeem yaj rau hauv dej ua ntej, tom qab ntawd ntxiv rau gypsum rau kev sib tov, lossis nws tuaj yeem sib tov sib npaug ntawm theem hmoov qhuav.
Kev sib raug zoo nrog lwm cov khoom ntxiv: Hauv gypsum ntsib plaster, HPMC feem ntau siv nrog lwm cov khoom ntxiv, xws li cov dej txo, cov dej khaws cia, thiab lwm yam. Thaum ntxiv ntau cov khoom ntxiv, them sai sai rau lawv qhov sib xws kom tsis txhob muaj kev cuam tshuam uas cuam tshuam rau kev ua tau zoo.
5. Qhov tseem ceeb ntawm HPMC hauv kev lag luam
Hauv gypsum facing plaster thiab lwm yam khoom siv hauv tsev, HPMC, ua ib qho tseem ceeb additive, ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua tau zoo ntawm cov khoom siv vim nws cov dej zoo heev, adhesion, thickening thiab tawg tsis kam. Nyob rau hauv xyoo tas los no, nrog rau kev thov ntau ntxiv rau cov khoom siv hauv tsev ntsuab, cov yam ntxwv tiv thaiv ib puag ncig ntawm HPMC kuj tau ua rau nws maj mam nyiam los ntawm kev ua lag luam. Hauv cov tsev niaj hnub, HPMC tsis yog tsuas yog txhim kho kev siv ntawm gypsum facing plaster, tab sis kuj txhim kho kev tsim kho zoo thiab kev ua haujlwm, thiab txhawb kev niaj hnub ntawm kev siv tshuab hauv tsev.
Daim ntawv thov ntawm HPMC hauv gypsum facing plaster tsis yog tsuas yog ua kom cov dej tuav, lo thiab tawg tsis kam ntawm cov khoom siv, tab sis kuj txhim kho kev ua haujlwm ntawm kev tsim kho, ua rau nws yog ib qho khoom siv tseem ceeb hauv kev tsim kho. HPMC cov yam ntxwv tshwj xeeb thiab kev txhim kho kev ua tau zoo ntau yam tau ua rau nws tseem ceeb dua hauv cov ntaub ntawv tsim kho, muab kev txhawb nqa kev siv tshuab zoo rau kev ua tiav zoo, ruaj khov. Yav tom ntej, nrog rau kev txhim kho tas mus li ntawm kev siv tshuab tsim kho, kev cia siab ntawm daim ntawv thov ntawm HPMC hauv cov ntaub ntawv gypsum yuav dav dua.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-19-2024