Qhov sib txawv ntawm Physicochemical Properties ntawm HPMC thiab HEMC

Gel kub yog qhov ntsuas tseem ceeb ntawm cellulose ether.Aqueous daws ntawm cellulose ethers muaj thermogelling zog.Raws li qhov kub thiab txias, qhov viscosity tseem txo qis.Thaum cov tshuaj kub nce mus txog ib qho nqi, cov tshuaj cellulose ether tsis yog pob tshab, tab sis tsim cov dawb colloid, thiab thaum kawg poob nws viscosity.Kev ntsuas kub ntawm gel yog hais txog kev pib cov qauv cellulose ether nrog 0.2% concentration ntawm cellulose ether tov thiab ua kom sov nws maj mam hauv dej da dej kom txog rau thaum cov tshuaj tshwm dawb los yog dawb gel, thiab cov viscosity ploj tag.Qhov kub ntawm cov tshuaj yog gel kub ntawm cellulose ether.

Qhov piv ntawm methoxy, hydroxypropyl thiab HPMC muaj qee yam cuam tshuam rau cov dej solubility, dej tuav, kev ua haujlwm saum npoo thiab gel kub ntawm cov khoom.Feem ntau hais lus, HPMC nrog cov ntsiab lus methoxyl siab thiab cov ntsiab lus tsis tshua muaj hydroxypropyl muaj cov dej solubility zoo thiab kev ua haujlwm zoo, tab sis cov gel kub tsis tshua muaj: nce cov ntsiab lus hydroxypropyl thiab txo cov ntsiab lus methoxy tuaj yeem ua rau cov gel kub.Txawm li cas los xij, cov ntsiab lus hydroxypropyl siab dhau lawm yuav txo cov gel kub, dej solubility thiab ua haujlwm saum npoo.Yog li ntawd, cellulose ether manufacturers yuav tsum nruj me ntsis tswj cov pab pawg neeg cov ntsiab lus kom ruaj khov khoom zoo.

Kev tsim kho kev lag luam thov

HPMC thiab HEMC muaj cov haujlwm zoo sib xws hauv cov khoom siv hauv tsev.Nws tuaj yeem siv los ua dispersant, dej tuav tus neeg saib xyuas, thickener, binder, thiab lwm yam. Nws yog tsuas yog siv rau hauv molding ntawm cement mortar thiab gypsum khoom.Nws yog siv rau hauv cov cement mortar kom nws cov cohesion thiab workability, txo flocculation, nce viscosity thiab shrinkage, thiab muaj cov dej tuav, txo cov dej poob ntawm cov pob zeb, ua kom muaj zog, tiv thaiv cov kab nrib pleb thiab huab cua ntawm cov dej-soluble ntsev, thiab lwm yam. Siv dav hauv cov cement, gypsum, mortar thiab lwm yam ntaub ntawv.Nws tuaj yeem siv los ua tus neeg sawv cev ua yeeb yaj kiab, thickener, emulsifier thiab stabilizer rau latex xim thiab dej-soluble resin xim.Nws muaj cov kev coj zoo tsis kam, kev sib xws thiab cov nplaum, txhim kho cov npoo nro, cov kua qaub-muaj zog thiab sib xyaw nrog hlau me pigments.Vim nws zoo viscosity cia stability, nws yog tshwj xeeb tshaj yog haum raws li ib tug dispersant nyob rau hauv emulsion txheej.Txhua yam, txawm hais tias lub kaw lus me me, nws ua haujlwm zoo thiab muaj ntau yam kev siv.

Lub gel kub ntawm cellulose ether txiav txim siab nws thermal stability nyob rau hauv daim ntawv thov.Lub gel kub ntawm HPMC feem ntau yog nruab nrab ntawm 60 ° C thiab 75 ° C, nyob ntawm seb hom, pab pawg neeg cov ntsiab lus thiab cov txheej txheem ntau lawm ntawm cov tuam txhab sib txawv.Vim yog cov yam ntxwv ntawm pawg HEMC, nws cov gelation kub yog qhov siab, feem ntau siab dua 80 ° C, yog li nws qhov kev ruaj ntseg ntawm qhov kub siab yog ntaus nqi rau HPMC.Nyob rau hauv kev siv tswv yim, nyob rau hauv lub caij ntuj sov kev tsim kho ib puag ncig, cov dej tuav peev xwm ntawm HEMC nrog tib viscosity thiab ntau npaum yog zoo dua li ntawm HPMC.Tshwj xeeb tshaj yog nyob rau sab qab teb, mortar yog qee zaum siv rau ntawm qhov kub thiab txias.Cov cellulose ether ntawm cov gel uas tsis tshua muaj kub yuav poob nws cov thickening thiab dej-tshem cov teebmeem ntawm qhov kub thiab txias, yog li ua kom lub zog ntawm cov cement mortar thiab ncaj qha cuam tshuam rau kev tsim kho thiab tawg tsis kam.

Vim tias muaj ntau pawg hydrophilic hauv cov qauv ntawm HEMC, nws muaj qhov zoo dua hydrophilicity.Tsis tas li ntawd, ntsug ntws tsis kam ntawm HEMC kuj tseem zoo.Daim ntawv thov cov nyhuv ntawm HPMC hauv cov nplais nplaum yuav zoo dua.