Cellulose ether tuaj yeem txhim kho kev ua tau zoo ntawm cov tshuaj khib ntub, thiab yog lub ntsiab additive uas cuam tshuam kev tsim kho ntawm cug. Cov kev xaiv tsim nyog ntawm cellulose tsim muaj ntau yam, txawv cov viscetle, sib txawv yuav muaj kev sib txawv ntawm kev txhim kho ntawm kev ua kom qhuav.
Kuj tseem muaj cov kab zoo zoo ntawm qhov sib xws ntawm cov cement muab tshuaj pleev thiab cov tshuaj ntawm cellulose ether. Cellulose ether tuaj yeem ua rau muaj viscosity heev ntawm cug. Qhov loj dua cov kev siv tshuaj, qhov tseeb pom tseeb. High-viscosity cellulose ethooure kua muaj siab thixotrostropy, uas tseem yog tus yam ntxwv loj ntawm cellulose ether.
Cov nyhuv tuab yog nyob ntawm cov degree ntawm polymerization ntawm cellulization ntawm cellule ntawm cellule ether, kev daws teeb meem, kub thiab lwm yam kev mob. 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. 10% -15% kev daws teeb meem tuaj yeem npaj rau qis-viscosity mc thiab hpmc, 5% -3% kev daws teeb meem tsuas yog npaj rau high-viscosity mc thiab HPMC. Feem ntau cov viscosity kev qhia ntawm cellulose ether kuj tseem tau txais graded los ntawm 1% -2% kev daws teeb meem.
High-molecular-phaus cellulose ether muaj siab thicking efficiency. Polymers nrog hnyav molecular hnyav muaj viscosities txawv nyob rau hauv tib lub ntsiab lus daws. Siab degree. 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 neeg sib txawv me me ntawm cov shear tus nqi, thiab cov viscosity siab txog lub hom phiaj viscosity, thiab viscosity nyob ntawm lub xaim hluav taws xob. 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.
Lub Sijhawm Post: Mar-08-2023