HPMC (HydroxyPropyyl methylulose) yog cov khoom siv polymercellulose) yog cov khoom siv polymer siv hauv kev tsim kho, tshwj xeeb tshaj yog nyob rau hauv gypsum thiab cement-based qhuav-mixed-mixed-mixed. Raws li hloov kho cellulose ether, HPMC muaj cov khoom siv lub cev thiab tshuaj lom neeg tshwj xeeb, uas ua rau nws ua lub luag haujlwm tseem ceeb hauv kev tsim cov ntaub ntawv hauv tsev.
1. Cov khoom yooj yim ntawm HPMC
HPMC yog dej-soluble, tsis muaj xim, tsis muaj hmoov nrog cov dej solubility zoo, rheling thiab zaj duab xis-ua cov khoom. Cov qauv molecular ntawm HPMC muaj cov methroxyprropyl, uas ua rau nws muaj cov teebmeem hydrophilicity thiab ua kom muaj kev cuam tshuam zoo hauv cov ntaub ntawv xws li cement thiab Gypsum. Los ntawm kho nws cov roj molecular, cov qib hloov chaw ntawm hydroxypropyl thiab lwm yam ntawm HPMC tuaj yeem hloov kho kom haum rau cov ntawv thov sib txawv.
2. Daim Ntawv Thov HPMC hauv Gypsum-Raws Qhuav qhuav-mixeded
Gypsum-based qhuav-mixed cug yog lub tsev siv nrog gypsum raws li lub ntsiab tivthaiv, uas yog dav siv hauv phab ntsa plastering, kho kom zoo nkauj thiab kho cov phiaj xwm. Cov txheej txheem ntau lawm ntawm gypsum-raws cai cug feem ntau yog, fypsum, cov neeg sawv cev, cov khoom sib ntxiv thiab siv ncaj qha. Raws li qhov tseem ceeb ntxiv, HPMC ua si hauv cov luag haujlwm hauv qab no hauv Gypsum-raws li college raws:
(1) Txhim kho cov kev ua haujlwm ntawm cug
Gypsum-raws li cug feem ntau yuav tsum muaj kev ua haujlwm zoo thaum kev tsim kho, xws li zoo adhesion, mob viscerate thiab yooj yim dua. HPMC txhim kho lub cev tshuaj khib nyiab ntawm cug, ua lub tshuaj khib muaj ib qho kev tsim kho, zam kev tsim txom los ntawm kev ua kom qhuav lossis ntub dej. Nws tuaj yeem txhim kho txoj kev sib khib ntawm cug thiab ntev dua lub sijhawm qhib, li kev txhim kho lub operating efficiency ntawm cov neeg ua haujlwm.
(2) txhim kho cov dej ceev ceev ntawm cug
Cov khoom siv gypsum muaj cov dej nqus dej muaj zog, uas tuaj yeem ua rau lub cug cug kom nrawm, yog li cuam tshuam rau kev ua haujlwm thiab qhov kawg ua kom zoo ntawm lub tshuaj khib. HPMC muaj cov dej zoo ua kom huv thiab tuaj yeem txo cov dej evaporation, yog li ncua cov txheej txheem ziab, kom huv si lub sij hawm qhib thiab ua tiav zoo dua thaum kev tsim kho. Qhov no yog qhov tseem ceeb rau kev txhim kho kev ua tau zoo.
(3) txhim kho lub zog thiab cov kav dej khov kho
HPMC tsis tuaj yeem txhim kho kev ua haujlwm ntawm cug, tab sis kuj txhim kho nws lub zog thiab kav ntev. Los ntawm kev kho cov tshuaj thiab hom HPMC, cov khoom siv tshuab hluav taws xob tau ua kom zoo thiab lub zog compressive thiab cov zog hloov pauv ntawm kev muab nce ntxiv. Nyob rau tib lub sijhawm, HPMC tuaj yeem txhim kho cov kab cug tsis kam ntawm kev muab cov tawg lossis kub hloov, yog li kev txhim kho lub durability ntawm cug.
3. Daim ntawv thov ntawm HPMC hauv Caas-Raws Qhuav-Mixed
Maas raws li cov tshuaj cug qhuav yog dav siv hauv phab ntsa, tsev, sab nrauv phab ntsa, thiab muaj lub lag luam xav tau zoo. Hauv txoj kev cai tsa suab paj nruag. Lub luag haujlwm ntawm HPMC yog qhov tseem ceeb hauv qab no:
(1) txhim kho cov fluidity thiab workrity ntawm cug
Hauv kev cute-raws cug, HPMC, ua cov tuab tuab, ua tau zoo txhim kho lub cug cug, ua kom nws tsim thiab ua haujlwm. Thaum lub sij hawm tsim qauv, lub fluidity ntawm cug khi ncaj qha cuam tshuam rau kev ua haujlwm zoo thiab ua tau zoo. Los ntawm kev ntxiv tus nqi tsim nyog
(2) Txhim kho cov dej hauv tsev thiab txo cov dej seem
Thaum lub sij hawm tawv ntawm cement-raws li kev sib xyaw sai heev, nws yog qhov yooj yim los ua rau muaj zog thiab nrawm ntawm lub cug. HPMC tuaj yeem txhim kho cov dej khaws cia ntawm cov cement-raws li cov dej khib nyiab, li kev txhim kho volpilization ntawm cov kev tsim kho thiab lub zog tom qab ua kom tawv.
(3) Txhim kho cov tawg tsis kam
Thaum lub sij hawm ua kom tawv nqaij tawv, cov cement-raws cug feem ntau ntsws, uas ua rau cov kab sib tsoo ntawm cov npoo av. HPMC ua tau zoo txo cov nrib pleb ntawm cov cement-raws li kev hloov kho ntawm lub cug, ua kom muaj cov khoom siv ntxiv thiab cov nplaum. Qhov no tawm tsam cov nyhuv tawg tsis tsuas yog txhim kho cov kev ua kom zoo nkauj ntawm lub tshuaj khib, tab sis kuj ua rau nws siv sijhawm ntev.
(4) ncua sij hawm hardening
HPMC tuaj yeem hloov kho cov hydration tus nqi ntawm cov cement-raws cug, li ncua lub sijhawm ua kom tawv. Qhov no yog qhov tshwj xeeb tshaj yog thaum ua haujlwm ntawm thaj chaw kub lossis thaj chaw loj dua rau cov neeg ua haujlwm thiab txo cov teeb meem kev tsim kho los ntawm kev ua kom nrawm dua.
4. Qhov zoo ntawm HPMC hauv Gypsum thiab Maas raws li cov tshuaj khib sib xyaw qhuav
(1) Kev tswj zoo rheological
HPMC tuaj yeem txhim kho cov khoom cug cug, suav nrog cov thickening, thiab ywg dej ua kom tiav, yog li kev txhim kho kev ua haujlwm ntawm cug. Los ntawm kev hloov kho tus nqi HPMC, cov kev tsim kho ntawm kev tshuaj khib tau ua tau zoo kom tau ua kom tau raws li cov kev xav tau ntawm cov chaw tsim khoom sib txawv.
(2) Adhesion zoo heev thiab dej ua ke
Txawm hais tias nyob rau hauv gypsum-raws lossis cement-raws li txhim kho cov nplaum thiab ua kom muaj kev sib tsoo ntawm kev ua haujlwm, thiab kom ua haujlwm zoo thiab tawv ncauj zoo thaum kev tsim kho.
(3) Kev tiv thaiv ib puag ncig thiab kev nyab xeeb
HPMC yog qhov tsis muaj tshuaj lom, tsis muaj ntxhiab, ib puag ncig cov tshuaj lom neeg uas ua tau raws li qhov yuav tsum muaj ntawm cov khoom siv hauv tsev niaj hnub. Yog li ntawd, kev siv HPMC tsis tuaj yeem txhim kho kev ua tau zoo ntawm cug, tab sis kuj tseem ua kom muaj kev nyab xeeb ntawm kev tsim kho.
HPMC ua si lub luag haujlwm tseem ceeb hauv daim ntawv thov ntawm Gypsum thiab Maas raws li kev sib xyaw qhuav. Nws txhim kho cov haujlwm ua haujlwm, lub zog thiab lub zog ntawm kev txhim kho cov rheology, adhesion, dej tuav thiab lwm yam khoom ntawm lub cug cug. Nrog rau qhov kev thov nce siab rau cov khoom lag luam tsim tsev hauv HPMC yog qhov dav dav, HPMC yuav txuas ntxiv mus ua si lub luag haujlwm tseem ceeb.
Lub sijhawm Post: Feb-15-2025