Hydroxypropyl methylcellulose (HPMC) yog ib qho uas tsis yog-ionic cellulose ether ua los ntawm ntuj polymer khoom cellulose los ntawm ntau cov txheej txheem tshuaj. Lawv yog cov tsis muaj ntxhiab, tsis qab thiab tsis muaj kuab paug dawb hmoov uas swells mus rau hauv ib qho ntshiab los yog me ntsis cloudy colloidal tov nyob rau hauv dej txias. Nws muaj thickening, khi, dispersing, emulsifying, zaj duab xis-forming, suspending, adsorbing, gelling, nto active, noo noo-retaining thiab tiv thaiv colloid zog. Hydroxypropyl methyl cellulose thiab methyl cellulose tuaj yeem siv rau hauv cov khoom siv hauv tsev, xim kev lag luam, hluavtaws cob, kev lag luam ceramic, tshuaj, khoom noj khoom haus, textile, kev ua liaj ua teb, tshuaj niaj hnub thiab lwm yam lag luam.
Cov nyhuv tuav dej thiab lub hauv paus ntsiab lus ntawm hydroxypropyl methylcellulose HPMC
Cellulose ether HPMC feem ntau plays lub luag hauj lwm ntawm dej tuav thiab thickening nyob rau hauv cov cement mortar thiab gypsum-based slurry, thiab tuaj yeem txhim kho lub zog cohesive thiab sag tsis kam ntawm slurry.
Cov yam ntxwv xws li huab cua kub, kub thiab cua siab ceev yuav cuam tshuam rau cov volatilization tus nqi ntawm cov dej hauv cement mortar thiab gypsum-based khoom. Yog li ntawd, nyob rau lub caij sib txawv, muaj qee qhov sib txawv ntawm cov dej tuav cov khoom ntawm cov khoom nrog tib tus nqi ntawm HPMC ntxiv. Hauv kev tsim kho tshwj xeeb, cov dej tuav cov nyhuv ntawm cov slurry tuaj yeem hloov kho los ntawm kev nce lossis txo tus nqi ntawm HPMC ntxiv. Kev tuav dej ntawm methyl cellulose ether nyob rau hauv qhov kub thiab txias yog ib qho tseem ceeb qhia kom paub qhov zoo ntawm methyl cellulose ether. HPMC series cov khoom lag luam zoo tuaj yeem daws qhov teeb meem ntawm cov dej tuav hauv qhov kub thiab txias. Nyob rau hauv lub caij kub kub, tshwj xeeb tshaj yog nyob rau hauv kub thiab qhuav thiab nyias-txheej tsim nyob rau hauv tshav ntuj sab, high-zoo HPMC yuav tsum tau los txhim kho cov dej tuav ntawm slurry. High-quality HPMC muaj zoo heev uniformity. Nws cov methoxy thiab hydroxypropoxy pawg yog sib npaug ntawm cov saw cellulose molecular, uas tuaj yeem txhim kho lub peev xwm ntawm oxygen atoms ntawm hydroxyl thiab ether bonds los koom nrog dej los tsim hydrogen bonds. , kom cov dej dawb ua cov dej khi, kom tswj tau cov evaporation ntawm cov dej los ntawm huab cua kub, thiab ua tiav cov dej tuav tau zoo.
High-zoo cellulose HPMC tuaj yeem ua tau zoo sib xws thiab muaj txiaj ntsig zoo hauv cov cement mortar thiab gypsum-based khoom, thiab qhwv tag nrho cov khoom siv, thiab tsim cov yeeb yaj kiab ntub dej, cov dej noo hauv lub hauv paus yog maj mam tso tawm rau lub sijhawm ntev, thiab cov kua nplaum inorganic. hydration cov tshuaj tiv thaiv ntawm cov khoom coagulated yuav xyuas kom meej lub zog thiab compressive zog ntawm cov khoom. Yog li ntawd, nyob rau hauv high-temperature lub caij ntuj sov tsim, thiaj li yuav ua tau cov dej tuav nyhuv, nws yog tsim nyog los ntxiv high-zoo HPMC cov khoom nyob rau hauv txaus kom muaj nuj nqis raws li lub mis, txwv tsis pub, yuav muaj tsis txaus hydration, txo lub zog, tawg, hollowing. thiab shedding tshwm sim los ntawm over drying. teeb meem, tab sis kuj nce kev tsim kho nyuaj ntawm cov neeg ua haujlwm. Raws li qhov kub thiab txias, cov dej HPMC ntxiv tuaj yeem txo qis, thiab tib cov dej tuav tau tuaj yeem ua tiav.
Kev tuav dej ntawm hydroxypropyl methylcellulose HPMC cov khoom nws tus kheej feem ntau cuam tshuam los ntawm cov hauv qab no:
Cov tshuaj tiv thaiv HPMC, methoxyl thiab hydroxypropoxyl sib npaug sib npaug, thiab cov dej tuav tau siab;
Cellulose ether HPMC thermal gel kub yog siab, cov dej tuav tus nqi siab; txwv tsis pub, cov dej tuav tus nqi tsawg;
Thaum cov viscosity ntawm cellulose ether HPMC nce, cov dej tuav tus nqi kuj nce; thaum lub viscosity nce mus txog ib theem, qhov nce hauv dej tuav tus nqi yuav maj mam;
Qhov ntau dua cov cellulose ether HPMC ntxiv, qhov siab dua cov dej tuav thiab cov dej tuav tau zoo dua. Nyob rau hauv qhov ntau ntawm 0.25-0.6% ntxiv, cov dej tuav tus nqi nce sai nrog qhov nce ntawm qhov sib ntxiv; Thaum cov nyiaj ntxiv ntxiv ntxiv, qhov kev nce ntawm cov dej tuav tus nqi qeeb.
Post lub sij hawm: Jun-01-2023