Cov nyhuv tuab ntawmCellulose etherNyob ntawm: cov degree ntawm polymerization ntawm cellulization ntawm cellule ntawm cellulose ether, kev daws teeb meem, tus nqi shear, kub thiab lwm yam. Cov cuab yeej ntawm cov kev daws teeb meem yog qhov tshwj xeeb rau alkyl cellulose thiab nws tau hloov cov derivatives. Cov khoom gelation muaj feem xyuam nrog rau qib degree hloov chaw, kev daws teeb meem thiab ntxiv. Rau hydroxyalkyl hloov cov derivatives, gel cov khoom tseem muaj feem cuam tshuam nrog kev hloov kho qib ntawm hydroxyalkyl. Rau qis viscosity mc thiab hpmc, 10% -15% kev daws teeb meem thiab HPMC tuaj yeem npaj 2% kev daws teeb meem nkaus xwb, thiab feem ntau Lub viscosity kev qhia ntawm cellulose ether tseem yog graded nrog 1%-500 kev daws teeb meem.
High-molecular cellulose cellulose muaj siab thickening efficiency, thiab cov hmoov av sib txawv muaj cov vascosities sib txawv hauv tib lub ntsiab lus sib txawv. Lub hom phiaj viscosity tsuas yog ua tiav los ntawm kev ntxiv cov nyiaj ntau ntawm cov roj ntsha tsis muaj roj ether ether. Nws viscosity muaj cov kev vam khom shear, thiab cov viscosity siab mus txog lub hom phiaj viscosity, yuav tsum tau ntxiv ntxiv, thiab cov viscosity nyob ntawm lub thicking efficiency. Yog li ntawd, kom ua tiav qhov xwm txheej, qee qhov nyiaj ntawm cellulose ether (concentration ntawm kev daws teeb meem) thiab daws viscosity yuav tsum lav. Lub gel kub ntawm kev daws teeb meem tseem txo qis linearly nrog kev nce ntawm cov kev daws teeb meem, thiab gels nyob rau hauv chav tsev kub tom qab ncav ib co siab. Qhov kev pom zoo ntawm HPMC yog qhov siab dua nyob rau hauv chav tsev kub.
Kev sib xws tseem tuaj yeem xaiv tau los ntawm kev xaiv qhov loj me thiab xaiv cov neeg ua haujlwm ntawm cellulose nrog kev hloov kho sib txawv. Lub npe hu ua kev hloov kho yog los qhia qee qib ntawm kev hloov ntawm hydroxyalkyl ntawm lub pob txha txheem ntawm MC. Los ntawm kev hloov pauv tus txheeb ze hloov chaw nyob ntawm ob qho chaw hloov chaw, yog, cov ntawv txheeb ze hloov cov pab pawg uas peb nquag hais. Ntau yam kev ua tau zoo xav tau ntawm cellulose ether tuaj yeem tau los ntawm kev hloov tus txheeb ze hloov chaw ntawm ob qho chaw hloov chaw.
High-viscosity cellulose ethooure kua muaj siab thixotrostropy, uas tseem yog tus yam ntxwv loj ntawm cellulose ether. Cov kev daws teeb meem aqueous ntawm MC polymers feem ntau muaj pseudopastic thiab tsis-thixotropic fluidity hauv qab no lawv qhov kub thiab txias, tab sis Newtonian Flow cov khoom ntawm cov nqi qis shear. Pseudoplastic nce nrog molecular hnyav lossis concentration ntawm cellulose ether, tsis hais hom kev hloov pauv thiab cov degree hloov chaw. Yog li ntawd, cellulose muaj kev hais ua neeg ntawm tib lub hom phiaj viscosity ntev li ntev tau pom tias muaj qhov siab thiab kub tu tas mus li. Cov tshuaj pleev cov qauv qauv yog tsim thaum qhov kub tau tsa, thiab muaj txiaj ntsig zoo siab tshaj plaws tshwm sim. Kev siab thiab cov viscosity cellulos cov neeg hais ua ke ua yeeb yam thixotrotropy txawm nyob hauv qab cov pa taws kub. Cov cuab yeej no yog cov txiaj ntsig zoo rau kev hloov kho ntawm leveling thiab sagging hauv kev tsim kho lub tshuab tshuaj khib.
Nws yuav tsum tau piav qhia ntawm no tias ntau dua lub viscosity ntawmCellulose ether, qhov zoo dua cov dej khaws cia, tab sis ntau dua cov viscosity, qhov siab dua cov txheeb ze ntawm cov solubility ether, uas muaj qhov tsis zoo ntawm lub tshuaj khib. Qhov siab tshaj lub viscosity, qhov pom ntau ntxiv rau cov nyhuv tuab rau ntawm lub tshuaj khib, tab sis nws tsis yog tag nrho. Qee qhov nruab nrab thiab qis viscosity, tab sis hloov kho cellulose muaj kev ua tau zoo dua hauv kev txhim kho lub zog ntawm lub zog ntub. Nrog rau kev nce viscosity, cov dej khaws cia ntawm cellulose ether txhim kho.
Lub Sijhawm Post: Apr-28-2024