HydroxyPropy cellulose HPMC yog cov tsis-ionic cellulose ither ua los ntawm cov ntaub ntawv polymer los ntawm cov khoom siv polymer los ntawm kev ua yeeb yam polymer los ntawm kev ua yeeb yam polymer. Lawv yog cov ntxhiab tsw tsis muaj ntxhiab, cov hmoov tsis dawb uas tsis muaj kuab dawb uas swed mus rau hauv qhov chaw ntshiab lossis me ntsis los rau hauv dej txias. Nws muaj cov yam ntxwv ntawm thickening, kev sib cais, emulsification, zaj duab xis, kev ua si, noo noo khaws thiab tiv thaiv kev tiv thaiv thiab tiv thaiv kev tiv thaiv. HydroxyPropyyl methylcellulose tuaj yeem siv rau hauv cov ntaub ntawv tsim tsev, cov tshuaj kho hluavtaws, cov khoom noj khoom haus, ua liaj ua teb, kev lag luam txhua hnub thiab lwm yam kev lag luam.
Dej khaws cia thiab lub hauv paus ntsiab lus etheren ethering slurry, uas muaj peev xwm txhim kho lub zog ua kom zoo thiab sag tsis kam ntawm cov slurry. Yam khoom xws li cua kub, ntsuas kub thiab cua kub yuav cuam tshuam rau cov dej colatilization thiab gypsum-based khoom. Yog li ntawd, nyob rau lub caij sib txawv, muaj qee qhov sib txawv hauv cov dej ua kom ruaj khov ntawm tib tus nqi HPMC. Hauv kev tsim kho tshwj xeeb, cov dej khaws cov nyhuv khaws cia ntawm cov slurry tuaj yeem hloov kho los ntawm nce lossis txo tus HPMC ntxiv.
Cov dej tuav tseg ntawm methyl cellulose hauv qab cov kev mob siab yog qhov ntsuas tau qhov ua tau zoo ntawm methyl cellulose ether. Cov khoom lag luam HPMC zoo dua tuaj yeem daws cov teeb meem ntawm dej khaws cia ntawm cov kub. Hauv cov caij nyoog kub, tshwj xeeb tshaj yog nyob rau hauv cov chaw kub thiab qhuav thiab nyias txheej HPMC yuav tsum txhim kho cov dej khaws cia ntawm cov slurry.
High-zoo HPMC muaj kev sib txig zoo heev. Nws cov methoxy thiab hydroxyprropoxy pawg yog tusyees faib raws lub peev xwm molecular, uas tuaj yeem txhim kho lub peev xwm ntawm cov dej hydroxyl thiab itherchen kom tsim cov dej hydrodiat. , Yog li ntawd cov dej dawb ua txoj hauv kev ua haujlwm, yog li tswj tau cov dej evaporation los ntawm huab cua siab, thiab ua tiav cov dej kom muaj zog.
HPMC muaj peev xwm sib xyaw ua ke HPMC tuaj yeem sib xyaw thiab cov khoom sib xyaw ua ke thiab cov khoom siv gypsum, thiab qhwv txhua txheej ntawm cov yeeb yaj kiab ntub. Cov dej hauv lub hauv paus yog maj mam tso rau lub sijhawm ntev. Cov khoom siv condensed undergroes dej cov tshuaj tiv thaiv, yog li kom ntseeg tau tias lub zog uas muaj zog thiab lub zog compressive ntawm cov khoom. Yog li ntawd, hauv kev tsim kho lub caij ntuj sov siab, txhawm rau ua kom tiav cov txiaj ntsig ntawm cov dej, qhov muaj dej tsis txaus, txo qis, tawg, hollowing, hollowing, hollowing, hollowing, holling thiab poob tawm yuav tshwm sim vim qhuav dhau los. Teeb meem, tab sis kuj tseem ua rau muaj kev nyuaj ntawm cov neeg ua haujlwm tsim khoom. Raws li qhov ntsuas kub tsawg dua, tus nqi HPMC ntxiv tuaj yeem txo qis qis, thiab tib cov nyhuv retentely tuaj yeem ua tiav.
Dej tuav tseg HPMC cuam tshuam los ntawm cov hauv qab no:
1. Homogeneity ntawm cellulose ether HPMC
Hauv homogeneously reacted hpmc, tshuaj methoxy thiab hydroxypropoxy pawg yog cov neeg muab faib rau, thiab cov dej khaws cia siab dua.
2. Thermal gel kub ntawm cellulose ether HPMC
Thermal gel kub yog high, dej tswj hwm tau siab; Ntawm qhov tsis sib xws, dej rov qab tus nqi qis qis.
3. Viscosity ntawm cellulose ether HPMC
Thaum lub viscos ntawm HPMC nce, cov dej tswj kav ntxiv kuj nce ntxiv; Thaum lub viscosity mus txog ib theem, kev nce hauv dej khaws cia qiv nyiaj ceev nyhav kom tiaj tus.
4. Txuas ntxiv ntawm Cellulose ether HPMC
Qhov ntau dua tus nqi ntawm cellulose ether HPMP ntxiv, ntau dua cov dej khaws cia thiab qhov zoo dua cov txiaj ntsig khaws cia. Nyob rau hauv cov thaj tsam ntawm 0.25-0.6% ntxiv, dej thim rov qab tus nqi nce sai dua nrog kev nce ntxiv; Thaum qhov kev ntxiv ntxiv nce ntxiv, ua kom nruj dua ntawm cov dej khaws cia qeeb qeeb qeeb.
Lub Sijhawm Post: Dec-16-2021