HPMC (Hydroxypropyl Methylcellulose) yog cov dej-soluble polymer khoom siv dav hauv kev tsim kho. Nws yog tsim los ntawm cov nroj tsuag ntuj cellulose los ntawm kev hloov tshuaj. Vim nws lub cev zoo thiab tshuaj lom neeg, HPMC tau siv ntau dua hauv cov khoom siv hauv tsev. Nws tsis tsuas yog txhim kho kev tsim kho ntawm cov khoom siv hauv tsev, tab sis kuj txhim kho lawv lub cev.
1. Cov nyhuv ntawm HPMC ntawm cov cement mortar
Cement mortar yog cov khoom siv hauv kev tsim kho thiab feem ntau yog siv rau kev tsim kho ntawm phab ntsa, pem teb, thiab lwm yam. Kev thov ntawm HPMC hauv cov cement mortar tuaj yeem ua rau muaj kev txhim kho tseem ceeb, feem ntau hauv cov hauv qab no:
(1) Txhim kho kev ua haujlwm
HPMC muaj cov khoom thickening zoo thiab tuaj yeem ua kom muaj qhov sib xws ntawm cov cement mortar, yog li txhim kho nws txoj haujlwm. Qhov no txhais tau hais tias thaum lub sij hawm tsim kho, mortar siv HPMC yog yooj yim dua rau kev khiav lag luam thaum nplawm thiab thov, txo cov nqi zog, thiab tuaj yeem txo cov ntshav ntawm cov khoom thiab txhim khu kev ruaj ntseg ntawm cov khoom.
(2) Txuas sijhawm qhib
Lub sijhawm qhib yog hais txog lub sijhawm uas cov cement mortar tuaj yeem ua haujlwm tau zoo thaum lub sijhawm tsim kho. Nyob rau hauv qhov chaw qis lossis kub siab, lub sijhawm qhib ntawm cov cement mortar yuav luv dua. Kev siv HPMC tuaj yeem txuas ntxiv lub sijhawm no tau zoo, zam kev ua kom tawv nqaij ua ntej ntxov, thiab pab cov neeg ua haujlwm tsim kho kom muaj sijhawm ntau los hloov kho thaum lub sijhawm tsim kho.
(3) Txhim kho qhov tawg tsis kam
HPMC tuaj yeem txhim kho qhov adhesion ntawm cov cement mortar, ua rau nws tsis tshua muaj kab nrib pleb nyob rau hauv qhuav shrinkage thiab kub hloov. Kev ua kom cov kab nrib pleb ua haujlwm tuaj yeem txhim kho qhov ruaj khov ntawm cov qauv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv qhov chaw xws li cov phab ntsa sab nrauv thiab cov plag tsev uas yooj yim cuam tshuam los ntawm ib puag ncig sab nraud.
(4) Txhim kho dej tsis kam
HPMC tuaj yeem txhim kho cov dej tsis zoo ntawm cov cement mortar. Thaum siv nyob rau hauv qhov chaw ntub dej, nws tuaj yeem txo qhov nkag mus rau hauv dej thiab txuas ntxiv lub neej kev pab cuam ntawm lub tsev.
2. Cov nyhuv ntawm HPMC ntawm cov tshuaj khib nyiab qhuav
Qhuav mortar yog cov khoom siv ua ntej sib xyaw ua ke uas tsuas yog yuav tsum tau tov nrog dej. Kev thov ntawm HPMC hauv cov tshuaj khib nyiab qhuav tuaj yeem ua rau muaj kev cuam tshuam loj:
(1) Txhim kho liquidity thiab operability
Qhuav mortar yuav tsum muaj fluidity zoo thiab ua haujlwm kom nws smoother thaum siv thiab tso. Raws li cov thickener, HPMC tuaj yeem txhim kho cov dej ntws ntawm cov tshuaj khib nyiab kom zoo, ua kom yooj yim rau kev khiav lag luam thaum lub sij hawm npaj thiab kev tsim kho tom qab ntxiv dej. Kev siv HPMC yog qhov tseem ceeb tshwj xeeb tshaj yog thaum cov cement cov ntsiab lus tsawg.
(2) Txhim kho adhesion
Lub zog sib txuas ntawm cov mortar qhuav ncaj qha cuam tshuam rau kev tsim kho kom zoo thiab ruaj khov ntawm lub tsev. HPMC tuaj yeem txhim kho kev sib raug zoo ntawm mortar, ua kom nws ruaj khov ntawm ntau lub tsev substrates, thiab tiv thaiv hollowing thiab ntog tawm.
(3) Txhim khu kev tuav dej
Kev tuav dej yog qhov tseem ceeb cuam tshuam rau qhov zoo ntawm mortar qhuav. HPMC tswj cov volatilization ntawm cov dej thiab ncua cov evaporation tus nqi ntawm cov dej, kom cov mortar muaj peev xwm tswj tau cov dej noo tsim nyog thaum lub sij hawm tsim kho thiab tsis txhob cuam tshuam rau kev tsim kho nyhuv vim qhuav qhuav heev.
3. Cov nyhuv ntawm HPMC rau cov txheej txheem
Txheej yog ib qho tseem ceeb ntawm cov khoom siv kho kom zoo nkauj, thiab nws qhov kev ua tau zoo thiab kev tsim kho muaj qhov cuam tshuam tseem ceeb rau qhov kawg hniav zoo nkauj. Raws li ib tug ntau thickener thiab stabilizer, HPMC yog dav siv nyob rau hauv coatings, feem ntau nyob rau hauv cov nram qab no yam:
(1) Txhim kho rheology ntawm txheej txheej
Lub thickening zog ntawm HPMC tuaj yeem txhim kho rheology ntawm cov xim, tswj cov viscosity ntawm cov xim, ua rau cov xim ntau dua txawm tias thaum siv, thiab tsis txhob ntws los yog poob sai heev. Qhov no yog qhov tseem ceeb tshwj xeeb nrog cov xim phab ntsa kom ntseeg tau tias cov xim sib npaug sib npaug thiab npog txhua qhov chaw.
(2) Txhim kho dej tuav thiab plam khoom
HPMC tuaj yeem txhim kho cov dej tuav ntawm cov txheej txheem thiab ncua cov evaporation ntawm cov dej, yog li txhim kho qhov slippage ntawm txheej, ua rau cov txheej txheem yooj yim rau kev khiav lag luam thaum lub sij hawm tsim kho thiab cov xim pleev xim zoo dua. Tsis tas li ntawd, txhim kho cov dej tuav pov hwm tiv thaiv cov xim tsis txhob tawg thaum ziab.
(3) Txhim kho huab cua tsis kam thiab hnav tsis kam ntawm cov txheej
HPMC tuaj yeem txhim kho UV tiv thaiv thiab huab cua tsis kam ntawm cov txheej txheej, kom nws tuaj yeem tswj tau nws qhov kev ua tau zoo yam tsis muaj kev hloov pauv loj thaum raug rau sab nraud ib puag ncig ntev, tshwj xeeb tshaj yog thaum raug tshav ntuj, nag thiab xuab zeb. Nyob rau tib lub sijhawm, HPMC tuaj yeem txhim kho qhov hnav tsis kam ntawm cov coatings thiab txhim kho cov kav ntev ntawm lub tsev.
4. Cov nyhuv ntawm HPMC rau cov ntaub ntawv gypsum
Gypsum yog lwm cov khoom siv hauv tsev thiab siv dav hauv kev kho kom zoo nkauj sab hauv phab ntsa, qab nthab thiab pem teb paving. Kev thov ntawm HPMC hauv cov ntaub ntawv gypsum yog feem ntau xav txog hauv cov hauv qab no:
(1) Txhim kho liquidity
HPMC tuaj yeem txhim kho qhov fluidity ntawm gypsum slurry, tso cai rau cov gypsum kis tau tusyees ntau dua ntawm lub hauv paus nto, txo cov npuas thiab tsis sib xws.
(2) Txhim kho adhesion
Lub adhesion ntawm plaster yog qhov tseem ceeb rau qhov zoo thiab kav ntev ntawm kev tsim kho. Raws li tus neeg sawv cev txhawb nqa, HPMC tuaj yeem txhim kho qhov adhesion ntawm gypsum thiab cov khoom siv hauv paus thiab txo qis los ntawm qhov tsis txaus adhesion.
(3) Ncua lub sij hawm condensation
HPMC tuaj yeem ncua lub sijhawm teeb tsa ntawm gypsum thiab tiv thaiv gypsum los ntawm hardening sai heev thaum tsim kho. Tshwj xeeb tshaj yog thaum tsim cov cheeb tsam loj, nws tuaj yeem yuav ntau lub sijhawm ua haujlwm rau cov neeg ua haujlwm tsim kho thiab ua kom cov txheej txheej zoo sib xws thiab kev tsim kho zoo.
5. Kev siv HPMC hauv lwm cov khoom siv hauv tsev
Ntxiv rau cov cement mortar, mortar qhuav, coatings thiab gypsum, daim ntawv thov ntawm HPMC hauv lwm cov ntaub ntawv hauv tsev kuj tau txais kev saib xyuas dav. Piv txwv li, nyob rau hauv thaj chaw ntawm sab nrauv phab ntsa rwb thaiv tsev cov ntaub ntawv, mortar adhesives, pobzeb adhesives, thiab lwm yam., HPMC yog ib qho tseem ceeb additive uas yuav txhim khu lub adhesion, fluidity thiab dej tuav cov ntaub ntawv, yog li txhim kho tag nrho cov kev tsim kho nyhuv.
Kev siv HPMC hauv cov khoom siv hauv tsev muaj ntau yam cuam tshuam thiab tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv cov khoom siv hauv tsev xws li cement mortar, mortar qhuav, coatings thiab gypsum. Los ntawm kev kho tus nqi thiab hom HPMC ntxiv, kev ua haujlwm tau zoo, adhesion, tawg tsis kam thiab ua haujlwm ntev ntawm cov khoom siv hauv tsev sib txawv tuaj yeem ua kom zoo, yog li kev txhim kho kev ua haujlwm thiab kev tsim vaj tsev zoo. Yog li ntawd, HPMC yog undoubtedly ib tug indispensable additive nyob rau hauv kev tsim kho kev lag luam thiab muaj dav kev lag luam prospects thiab daim ntawv thov muaj peev xwm.
Post lub sij hawm: Nov-11-2024