Cov khoom siv cellulose ether HPMC thiab HEMC muaj ob pawg hydrophobic thiab hydrophilic. Cov pab pawg methoxy yog hydrophobic, thiab pawg hydroxypropoxy txawv raws li txoj haujlwm hloov. Qee qhov yog hydrophilic thiab qee qhov yog hydrophobic. Hydroxyethoxy yog hydrophilic. Lub npe hu ua hydrophilicity txhais tau hais tias nws muaj cov cuab yeej nyob ze dej; lub hydrophobicity txhais tau hais tias nws muaj cov cuab yeej ntawm repelling dej. Txij li cov khoom lag luam yog ob qho tib si hydrophilic thiab hydrophobic, cov khoom lag luam cellulose ether muaj kev ua haujlwm saum npoo, uas tsim cov pa npuas. Yog tias tsuas yog ib qho ntawm ob lub zog yog hydrophilic lossis hydrophobic, tsis muaj npuas yuav tsim tawm. Txawm li cas los xij, HEC tsuas yog muaj pawg hydrophilic ntawm hydroxyethoxy pawg thiab tsis muaj pawg hydrophobic, yog li nws yuav tsis tsim npuas.
Qhov tshwm sim npuas kuj tseem cuam tshuam ncaj qha rau qhov sib cais ntawm cov khoom. Yog tias cov khoom tawg ntawm qhov tsis sib xws, npuas yuav tsim. Feem ntau, qhov qis dua qhov viscosity, qhov nrawm nrawm dua. Qhov siab dua qhov viscosity, qhov qis dua qhov kev sib cais. Lwm qhov laj thawj yog qhov teeb meem granulation, granulation tsis sib npaug (qhov loj me me tsis sib xws, muaj qhov loj thiab me). Ua rau lub sij hawm dissolution txawv, ua rau huab cua npuas.
Qhov zoo ntawm cov npuas npuas tuaj yeem ua rau thaj tsam ntawm batch scraping, kev tsim kho vaj tse kuj zoo dua, slurry yog sib dua, thiab batch scraping yog yooj yim dua. Qhov tsis zoo yog tias qhov muaj npuas yuav txo cov khoom ntawm qhov ntom ntom, txo lub zog, thiab cuam tshuam rau huab cua tsis kam ntawm cov khoom.
Post lub sij hawm: Feb-27-2023