HydroxyPropyyl methylcellulose (HPMC) Yog cov polymer sib xyaw ua ke hauv cov ntaub ntawv tsim tsev, tshwj xeeb tshaj yog hauv Gypsum tig ntsej muag, qhov uas nws ua si lub luag haujlwm tseem ceeb. Raws li kev ntxiv, HPMC tau txhim kho kev ua haujlwm, dej khaws cia thiab cov nplaum ntawm gypsum tig rau kev tsim kho thiab kho kom zoo nkauj.
1. Cov yam ntxwv ntawm HPMC
HPMC yog cov tsis-ionic cellulose ether nrog cov dej solubility thiab thickening cov khoom. Nws tuaj yeem yaj sai nyob rau hauv dej los ua cov khaub ncaws tsis sib xws, thiab muaj cov nplaum sib xyaw, thiab ua yeeb yaj kiab zoo, ua yeeb yaj kiab ua yeeb yaj kiab thiab dej khaws cia. Cov yam ntxwv no ua HPMC dav siv hauv cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog tsim nyog siv rau hauv gypsum-based cov ntaub ntawv.
Cov yam ntxwv tseem ceeb ntawm HPMC suav nrog cov hauv qab no:
Dej khaws cia: HPMC tuaj yeem khaws cov dej noo hauv Gypsum ntsib plaster, uas yog ncua sij hawm qhib lub sijhawm thiab lub sijhawm ua haujlwm ntawm cov khoom siv.
Thickening: Raws li cov tuab dua, hpmc tuaj yeem ua rau viscosity ntawm plaster, tiv thaiv kev ua si ntawm sagging, thiab txhim kho kev txaj muag.
Lubricity: Lubricating cov khoom ntawm HPMC txhim kho kev tuav tes uas xav tias plaster thiab ua kev tsim kho yooj yim dua.
Zaj duab xis-nws tuaj yeem tsim zaj duab xis tiv thaiv nyob rau saum npoo ntawm plaster, txhim kho cov kev tawg tawm ntawm plaster.
2. Mechanism ntawm kev ua ntawm HPMC hauv Gypsum tig ntsej muag
Tom qab ntxiv HPMC mus rau Gypsum ntsib plaster, cov khoom muaj peev txheej tau txhim kho feem ntau yog hauv cov hauv qab no:
Txhim kho cov dej ua haujlwm: thaum lub sijhawm tsim kho ntawm Gypsum tig rau plaster, yog tias cov dej poob qis, nws yuav ua rau tsis muaj tawv me, tawg thiab txo lub zog. HPMC tuaj yeem tsim cov yeeb yaj kiab zoo nyob rau hauv cov plaster, kom cov plaster txaus, kom muaj kev phom sij tuaj yeem tswj tau lub zog ua kom muaj zog, yog li zam dhau cov kab nrib pleb.
Txhim kho Adhesion: HPMC tuaj yeem tsim ib zaj duab xis nyias nyob rau saum npoo ntawm cov nplaum, yog li cov nplaum ntawm cov phab ntsa ntawm phab ntsa yog nce. Tshwj xeeb tshaj yog nyob rau porous thiab qhuav substrates, cov dej khaws cia hauv HPMC kuj tseem tuaj yeem tiv thaiv cov dej hauv qab sai sai, yog li txhim kho cov nyhuv sib raug zoo.
Txhim kho tawg tsis kam: gypsum ntsib plaster yog raug rau shrinkage tawg vim kev hloov pauv kub thiab av noo.HPMC Ua rau qeeb hauv lub ziab dej shrinkage los ntawm kev kho cov pa evap ntawm cov dej, yog li txo qis kev pheej hmoo ntawm cov txheej txheej. Nyob rau tib lub sijhawm, cov yeeb yaj kiab colloid tsim los ntawm HPMC kuj tseem tuaj yeem muab qee qhov kev tiv thaiv kev tiv thaiv kev tiv thaiv rau cov plaster.
Txhim kho kev ua haujlwm: HPMC tuaj yeem nce viscosity thiab viscosity ntawm plaster, ua rau nws ua haujlwm rau kev lag luam thaum txhuam hniav. HPMC txhim kho cov kev ua haujlwm ntawm plaster, thiab cov ua haujlwm tsim kho tuaj yeem tswj cov tuab thiab huv, uas pab tau txais cov nyhuv zoo.
3. HPMC txhim kho kev ua tau zoo ntawm Gypsum tig tau plaster
Qhov kev sib ntxiv ntawm HPMC muaj ntau yam kev txhim kho ntawm kev ua tau zoo ntawm Gypsum ntsib plaster, suav nrog:
Rheological txhim kho: HPMC tuaj yeem ua kom cov plaster, tswj lub viscosity ntawm plaster, tiv thaiv cov teeb meem sagging, thiab txhim kho kev txhuam hniav ntawm lub plaster.
Txhim kho cov nplooj zeeg: cov yeeb yaj kiab colloid muaj los ntawm HPMC muaj cov nyhuv tiv thaiv rau ib qho, tiv thaiv cov khoom siv kub thiab tawg.
Txhim kho cov shrinkage tsis kam:HPMC Tsoom cov ntsiab lus noo noo nyob rau hauv lub plaster, undeviates qhov teeb meem shrinkage tshwm sim los ntawm dej evaporation, thiab ua kom cov plaster txheej ruaj khov thiab tsawg dua luag tawg.
Txhim kho Adhesion: Cov khoom ua ke ntawm HPMC tuaj yeem txhim kho cov nplaum ntawm cov nplaum ntawm cov npoo av ntawm substrate, ua cov txheej yuav tsum poob tawm.
4. Kev ceev faj hauv kev siv HPMC
Txawm hais tias HPMC muaj ntau yam zoo rau Gypsum ntsib cov plaster, cov hauv qab no yuav tsum tau sau tseg hauv nws siv:
Ib qho ntxiv ntawm kev tswj hwm: Ntau HPMC ntxiv yuav ua rau cov plaster los ua cov nplaum dhau, ua rau kom du, cuam tshuam rau cov nyhuv tsim. Feem ntau hais lus, tus nqi HPMC yuav tsum tau tswj hwm hauv thaj tsam 0.1% -0.5%, thiab kho raws li cov kev xav tau tiag tiag.
Txawm sib xyaw ua ke:HPMC Yuav tsum tau ua kom tiav tag nrho thaum tov nrog cov khoom xws li gypsum los xyuas kom ntseeg tau tias muaj kev sib cais thiab kev ua kom zoo nkauj. HPMC tuaj yeem yaj nyob hauv dej ua ntej, tom qab ntawd ntxiv rau gypsum rau kev sib xyaw, lossis nws tuaj yeem sib xyaw covyees theem qhuav.
Kev sib xyaw nrog lwm cov kev sib ntxiv: Hauv Gypsum tig tau plaster, xws li cov dej rov qab, thiab lwm yam kom tsis txhob muaj kev cuam tshuam nrog kev ua tau zoo.
5. Qhov tseem ceeb ntawm HPMC hauv kev lag luam
Hauv Gypsum ntsib cov plaster thiab lwm yam khoom siv hauv tsev, HPMC, ua ib qho tseem ceeb ntawm kev txhim kho cov khoom siv tau zoo, cov nplaum, thickening thiab tawg tsis kam. Nyob rau hauv xyoo tsis ntev los no, nrog rau kev nce qib nce rau cov khoom lag luam ntsuab, cov kev tiv thaiv ib puag ncig ntawm HPMC kuj tau ua kom nws tau ua tiav ntawm kev ua lag luam. Hauv cov vaj tse niaj hnub, HPMC tsis yog txhim kho cov nyhuv ntawm gypsum tig tau zoo thiab ua tau zoo, thiab txhawb nqa lub tswv yim ntawm kev siv tshuab.
Daim ntawv thov ntawm HPMC hauv Gypsum ntsej muag plaster tsis tsuas yog txhim kho cov dej ua haujlwm, tab sis kuj tseem txhim kho kev ua haujlwm, ua rau nws tsis tseem ceeb ntxiv hauv kev tsim kho. HPMC cov xeeb ceem tshwj xeeb thiab muaj ntau qhov kev ua tau zoo tau ua rau nws muaj qhov tseem ceeb hauv tsev, muab kev txhawb zog ua haujlwm zoo rau kev ua tiav zoo, muaj txiaj ntsig zoo tiav. Nyob rau hauv lub neej yav tom ntej, nrog kev txhim kho kev tsim kho cov khoom siv txuas ntxiv, cov ntawv thov kev cia siab ntawm HPMC hauv Gypsum-based cov ntaub ntawv yuav nthuav dav.
Lub Sijhawm Post: Nov-19-2024