HydroxyPropyyl methylcellose (HPMC) yog cov tsis-ionic cellulose ionic cohetic hloov los ntawm cov cellulose ntuj. Vim nws txoj kev cia dej zoo, thickening thiab ua yeeb yaj kiab-tsim cov khoom, HPMC tau siv dav hauv kev tsim kho kev tsim kho, tshwj xeeb hauv Gypsum-based cov ntaub ntawv tsim tsev. Cov khoom siv gypsum yog ib qho kev siv kho kom zoo nkauj thiab sab nrauv kho kom zoo nkauj, nplaum thiab screeds. Cov lus qhia ntawm HPMC tau txhim kho kev ua tau zoo ntawm Gypsum-based cov ntaub ntawv, ua rau lawv zoo tshaj plaws ntawm kev tsim cov constrationability thiab durability.
1. HPMC txhim kho kev ua haujlwm ntawm gypsum-based cov ntaub ntawv
Txhim Kho Cov Khoom Siv Dej
Ib qho ntawm cov haujlwm tseem ceeb ntawm HPMC yog los txhim kho cov dej khaws cia ntawm gypsum-based cov ntaub ntawv. Thaum lub sij hawm hydration txheej txheem, Gypsum xav tau dej txaus kom ua tiav cov tshuaj tiv thaiv ua kom tawv. Dej tsis txaus yuav ua rau tsis muaj tawv tawv, txo lub zog thiab lwm yam teeb meem. HPMC tuaj yeem txo cov pa evap ntawm kev sib sau ua ke cov yeeb yaj kiab colloidal ua yeeb yaj kiab, yog li ua kom cov txheej txheem hydration ntawm Gypsum tuaj yeem ua kom yooj yim. Qhov no tsis tsuas yog txhim kho lub zog ntawm cov khoom tab sis kuj txuas nws lub neej pabcuam. Tsis tas li ntawd, cov dej khaws cia ntawm HPMC ua rau cov slurry smoother thaum lub sij hawm tsim kho, ua rau nws thov tau yooj yim rau kev ua haujlwm los ntawm dej poob.
Txhim Kho Kev Ua Haujlwm
HPMC tuaj yeem txhim kho cov haujlwm ua haujlwm ntawm cov khoom siv gypsum, ua rau lawv yooj yim rau kev thov, qib thiab calender. Nws cov nyhuv thickening enables cov slurry kom tswj viscosity uas tsim nyog thiab fellity, ua rau nws tsis tshua muaj kev puas tsuaj thiab ntws. Nyob rau tib lub sijhawm, HPMC txhim kho lub lubricity ntawm gypsum cov ntaub ntawv, ua rau nws xis nyob thaum kev tsim kho thiab yooj yim dua ua haujlwm. Qhov no yog qhov tshwj xeeb tshaj yog qhov tseem ceeb rau kev pleev xim loj-thaj chaw lossis kho kom zoo nkauj, txo qhov tau ua tiav thiab txhim kho kev tsim kho kev ua haujlwm.
Ncua Sijhawm Qhib Sijhawm
Thaum lub sij hawm tsim kho, cov khoom siv gypsum-yuav tsum muaj lub sijhawm qhib (uas yog, lawv tuaj yeem ua cov neeg ua haujlwm tuaj yeem ua tiav cov ntawv thov lossis ua haujlwm qib siab nyob rau lub sijhawm kom tsim nyog. HPMC tuaj yeem ncua kev evaporation ntawm cov dej los ntawm nws cov dej zoo thiab thickening cov khoom, yog li txuas lub sij hawm qhib ntawm cov khoom siv. Qhov no muab sijhawm ntau rau cov neeg ua haujlwm ntxiv kom hloov kho kom zoo thiab xyuas kom zoo.
2. HPMC txhim kho cov cuab yeej ua haujlwm ntawm gypsum-based cov ntaub ntawv
Nce kev siv
Cov dej khaws cov nyhuv ceev ntawm HPMC tsis tuaj yeem tsuas yog muaj lub luag haujlwm zoo ntawm Gypsum, tab sis kuj ua lub luag haujlwm zoo ntawm kev txhim kho thaum ntxov ntawm Gypsum-based cov ntaub ntawv. Thaum lub sij hawm hydration txheej txheem, HPMC hloov kho coverple dej kom ua rau gypsum crystal ntau dua compact thiab niaj hnub txhim kho lub zog thaum ntxov ntawm cov khoom siv. Nyob rau tib lub sijhawm, kev sib ntxiv ntawm HPMC kuj txo lub porosity nyob rau hauv cov slurry nyob rau hauv cov nplais, tso cai rau cov khoom siv gypsum, raws li cov khoom siv ua kom muaj zog compressive lub zog thiab lub zog hloov dua tshiab tom qab ua kom tawv.
Txhim Kho Cov Khaub Ncaws Kuj Kuj
Gypsum-based cov ntaub ntawv yog nquag kom ziab shrinkage nrib pleb thaum lub sijhawm ua kom qhuav, uas yog tshwm sim los ntawm cov dej lim dej. HPMC ua tau zoo txo qhov tshwm sim ntawm qhuav shrinkage tawg los ntawm kev kho cov dej evaporation tus nqi thiab nce cov khoom muaj zog ntawm cov khoom. Tsis tas li ntawd, cov yas qhwv ntawm HPMC muab cov khoom siv rau qee cov qib elasticity thiab deformability thaum cov txheej txheem ziab thiab ua kom tawv nqaij tsis kam. Qhov no tuaj yeem txo cov teeb meem ntawm cov nrib pleb nto tshwm sim los ntawm cov khoom tawg thaum qhuav xws li phab ntsa sab hauv thiab phab ntsa sab nraud.
3. Cov nyhuv ntawm HPMC ntawm lub durability ntawm gypsum-based cov ntaub ntawv
Txhim kho khov-thaw tsis kam
Vim tias nws cov qauv ntxig, cov khoom siv gypsum tau yooj yim los ntawm kev ua kom khov-thaw mus los hauv ib puag ncig, ua rau muaj teeb meem xws li taws ua kom sov. Tom qab HPMC tau nkag mus rau hauv Gypsum-based cov ntaub ntawv, nws tuaj yeem txo cov dej khov ntawm cov khoom siv los ntawm cov khoom puas tsuaj rau cov khoom ua los ntawm khov-thaw mus. Ib qho ntxiv, cov duab ua yeeb yaj kiab ntawm HPMC tuaj yeem ua cov yeeb yaj kiab tiv thaiv nyob rau saum npoo ntawm cov khoom siv khov-thaw ua kom khov-thaw kuj.
Txhim Kho Cov Carbonation Kuj
Cov ntaub ntawv gypsum yog siv rau cov tshuaj pab roj carbonization thaum raug rau huab cua, uas ua rau poob ntawm lub zog thiab kev chim siab. Zaj duab xis-ua nyhuv ntawm HPMC tuaj yeem tsim cov txheej tiv thaiv tuab ntawm cov khoom los tiv thaiv cov pa roj carbon dioxide, yog li txo qhov tshwm sim ntawm kev siv roj teeb. Nyob rau tib lub sijhawm, cov dej khaws cov nyhuv khaws cia ntawm HPMC ua rau Gypsum ntau dua hydrated, ntxiv txhim kho cov khoom siv tiv thaiv carbon-carbonation. Qhov no tso cai rau cov khoom siv gypsum-based los qhia cov khoom siv ruaj khov ntxiv rau kev siv ntev, tshwj xeeb tshaj yog thaum siv sab nraum zoov.
4. Txhim kho ib puag ncig kev yoog raws HPMC rau cov khoom siv gypsum-based
Txhim kho cov dej tsis kam ua cov khoom siv
Gypsum cov ntaub ntawv feem ntau soften thiab yaj tau yooj yim thaum raug dej, uas txwv lawv siv hauv cov puag ncig huab. Cov dej tuav thiab ua yeeb yaj kiab ua yeeb yam ntawm HPMC tuaj yeem txhim kho cov khoom siv tsis kam ntawm gypsum cov ntaub ntawv, ua rau lawv tsis tshua muaj kev cuam tshuam dej rau hauv cov dej hiav txwv. Los ntawm kev sib sau cov txheej dej dej nyob saum npoo, HPMC muab cov khoom siv gypsum zoo thiab lub zog tom qab kev sib cuag nrog noo noo, ua rau nws tsis tshua muaj rau kev xeb.
Txhim kho kev tiv thaiv rau tshuaj corrosion
HPMC kuj tseem tuaj yeem txhim kho cov tshuaj tsis kam ntawm gypsum-based cov ntaub ntawv. Cov zaj duab xis ntom nws cov ntaub ntawv ntawm cov khoom saum npoo av tsis tsuas yog thaiv cov tshuaj tiv thaiv ntawm cov kua qaub thiab alkali cov khoom siv puas tsuaj los ntawm kev siv tshuaj corrosion. Cov cuab yeej no tso cai rau cov ntaub ntawv gypsum uas siv rau hauv cov tsev xav tau ntau, xws li cov vaj tse muaj tshuaj lom neeg.
Los ntawm nws cov cim ntau ntau yam xws li dej cia, tuab thiab ua yeeb yam zoo, ua kom muaj kev yoog raws, thiab ib puag ncig cov ntaub ntawv hauv tsev. Qhov kev sib txuas ntawm HPMC tsis yog txhim kho kev tsim kho kom yooj yim ntawm gypsum-based cov ntaub ntawv, tab sis kuj txhim kho nws cov kev yoog raws li ib puag ncig, muab nws qhia ntxiv cov kev cia siab hauv kev tsim kho.
Lub Sijhawm Post: Feb-14-2025