Hauv cov haujlwm tsim kho niaj hnub, kev ua tau zoo ntawm lub tsev cov ntaub ntawv plays lub luag haujlwm tseem ceeb hauv qhov project zoo thiab ruaj khov. Nrog kev txhim kho thev naus laus zis, kev sib ntxiv ntxiv tau raug maj mam ntxiv rau cov khoom siv hauv tsev kom txhim kho lawv cov kev ua tau zoo. Ntawm lawv, hydroxypropyl methylcellose (HPMC), raws li kev hloov kho tshuaj tseem ceeb, tau siv dav hauv cov ntaub ntawv hauv tsev, tshwj xeeb tshaj yog nyob hauv kev txhim kho cov dej rov qab.
Cov yam ntxwv yooj yim ntawm HPMC
HPMC yog cov tsis muaj ionic cellulose ether tau los ntawm kev hloov tshuaj lom neeg ntawm ntuj cellulose, nrog dej solubility zoo thiab versatility. Nws tuaj yeem pom sai rau hauv dej los ua cov kua tshab los yog ua kom qeeb, ncua kev sib luag, kev tawm tsam, yeeb yaj kiab ua yeeb yaj kiab thiab dej khaws cia. Tshwj xeeb tshaj yog nws lub peev xwm kav dej ua rau HPMC ib qho ntawm cov tsis muaj kev sib ntxiv hauv cov ntaub ntawv hauv tsev.
Lub luag haujlwm ntawm dej tuav cia rau cov ntaub ntawv tsim
Cov dej tuav tseg ntawm cov ntaub ntawv hauv tsev hais txog kev muaj peev xwm ntawm cov ntaub ntawv los khaws cov dej noo thaum kev tsim kho thiab cov khoom tiav ua tiav. Cov ntaub ntawv sib koom ua ke thiab cov gypsum raws li yuav tsum muaj qee qhov dej los koom rau hauv cov tshuaj lom thiab cov txheej txheem ua kom tawv thaum lub sijhawm kev tsim kho. Yog tias cov dej rov qab yog qhov tsis txaus, dej yuav ploj ua ntej ntxov, ua rau cov teeb meem hauv qab no:
Kev tsim kho kev ua haujlwm tsis zoo: txoj kev evaporation ntawm cov dej sai dhau yuav ua rau cov khoom poob mus rau poob siab, cuam tshuam rau kev yooj yim thiab ua haujlwm zoo ntawm kev tsim kho.
Txo lub zog: ib feem uas tsis tau ua tiav cov tshuaj tiv thaiv hydration yuav dhau los ua qhov tsis muaj zog hauv cov khoom siv, yog li txo lub zog tag nrho.
Ntaw tawg: vim tias cov dej nrawm nrawm, shrinkage cracks yog nquag tshwm sim nyob rau saum npoo ntawm cov khoom, cuam tshuam rau cov tsos thiab lub zog.
Tsis txaus ntseeg: Tshwj xeeb tshaj yog cov ntaub ntawv sib xyaw thiab muaj zog ua kom muaj zog yuav ua rau muaj teeb meem xws li kev ntog.
Lub luag haujlwm ntawm HPMC hauv kev txhim kho dej kom zoo
Cov mechanism ntawm kev txhim kho cov dej ua haujlwm ntawm HPMC hauv cov ntaub ntawv tsim tsev yog qhov tseem ceeb ntawm cov hauv qab no:
Sib sau cov dej-khaws zaj duab xis
Tom qab HPMC yws hauv dej, nws yuav tsim cov dej ntom ntom ntom-khaws zaj duab xis nyob rau saum npoo ntawm cov khoom siv. Cov yeeb yaj kiab no tau ua tau zoo tiv thaiv kev nrawm nrawm ntawm dej, thaum tusyees faib cov dej kom ntseeg tau tias qhov kev nce qib ntawm cov dej.
Txhim khu viscance ntawm cov ntaub ntawv
HPMC muaj cov nyhuv zoo. Nws tuaj yeem nce viscosity ntawm cov sib tov hauv collab lossis putty thiab tsim tus qauv mesh muaj zog. Cov qauv no tuaj yeem kaw hauv noo noo thiab txo cov dej tsis muaj dej.
Txhim kho cov khoom siv hluav taws xob rheological ntawm cov ntaub ntawv
Los ntawm kho tus nqi HPMC ntxiv, cov khoom siv hauv tsev tuaj yeem ua kom zoo thiab kom lawv muaj peev xwm tswj tau cov dej siab thiab qhuav. Qhov no yog qhov tshwj xeeb tshaj yog rau kev tsim kho nyob rau lub caij ntuj sov lossis huab cua qhuav.
Txhim Kho Cov Kev Siv Dej
HPMC tuaj yeem txo cov khoom siv stratification thiab ua rau cov dej xa tawm ntau yam, yog li kev txhim kho kev txo qis lossis kev tsim kho kom zoo los ntawm cov dej tsis txaus.
Chaw thov
HPMC cov dej khaws cov txiaj ntsig zoo dua ua rau nws siv dav hauv cov ntaub ntawv hauv qab no:
Pobzeb nplaum: Xyuas kom meej tias cov nplaum yuav tsis poob vim dej poob thaum lub sijhawm kev tsim kho thiab txhim kho adchesion.
Siv lub roj cug: txhim kho kev tsim kho thiab txo cov shrinkage cracks.
Kev Ntsuas Tus Kheej Theem: Ua kom cov kev kawm tau ruaj khov ntawm cov tshuaj tiv thaiv dej thiab txo cov xuab zeb thiab cov kab nrib pleb.
Putty hmoov: txhim kho kev tsim kho kev ua haujlwm thiab cov txiaj ntsig ntawm cov txheej putty.
Cov ntaub ntawv gypsum: tiv thaiv cov dej ntau dhau thiab txhim kho tag nrho kev ua tau zoo.
HPMC zoo zoo txhim kho kev tsim kho thiab cov khoom kawg zoo ntawm cov ntaub ntawv los ntawm nws cov dej tsis sib xws hauv cov ntaub ntawv hauv tsev. Nrog kev txhim kho txuas ntxiv ntawm kev tsim kho cov kev tsim kho rau cov khoom ua tau zoo, daim ntawv thov kev cia siab ntawm HPMC yuav nthuav dav. Los ntawm cov qauv tsim tsim nyog no thiab kev ua kom zoo dua ntawm kev ntxiv cov nyiaj, tab sis kuj tseem txhim kho lwm yam khoom, pab kom muaj kev nkag siab zoo txhim kho cov haujlwm tsim kho.
Lub sijhawm Post: Feb-15-2025