Taw qhia rau Hydroxyethylcellulose (HEC):
Hydroxyethylcellulose yog ib tug derivative ntawm cellulose, ib txwm tshwm sim polysaccharide pom nyob rau hauv lub cell phab ntsa ntawm cov nroj tsuag.Cellulose yog tsim los ntawm cov piam thaj rov qab txuas ua ke los ntawm β-1,4 glycosidic bonds.Hydroxyethylcellulose yog tau los ntawm kev hloov kho cellulose los ntawm kev qhia txog cov pab pawg hydroxyethyl (-CH2CH2OH) mus rau hauv nws cov pob txha.
Txheej txheem ntau lawm:
Etherification ntawm Cellulose: Kev tsim khoom ntawm HEC suav nrog etherification ntawm cellulose.Cov txheej txheem no feem ntau pib nrog cellulose muab los ntawm cov ntoo pulp lossis paj rwb linters.
Cov tshuaj tiv thaiv nrog Ethylene Oxide: Cellulose yog reacted nrog ethylene oxide nyob rau hauv alkaline tej yam kev mob.Cov tshuaj tiv thaiv no ua rau kev hloov pauv ntawm pawg hydroxyl ntawm cov pob txha cellulose nrog cov pab pawg hydroxyethyl, ua rau hydroxyethylcellulose.
Purification: Cov khoom yog ces purified kom tshem tawm cov unreacted reagents thiab sab khoom.
Cov khoom ntawm Hydroxyethylcellulose:
Solubility: HEC yog soluble nyob rau hauv ob qho tib si dej txias thiab kub, ua kom pom tseeb rau me ntsis turbid daws nyob ntawm qhov concentration.
Viscosity: Nws nthuav tawm tus cwj pwm pseudoplastic, txhais tau tias nws cov viscosity txo qis nrog nce shear tus nqi.Lub viscosity ntawm HEC cov kev daws teeb meem tuaj yeem hloov kho los ntawm ntau yam xws li kev xav tau thiab qib kev hloov pauv.
Film-Forming Properties: HEC tuaj yeem tsim cov yeeb yaj kiab hloov tau yooj yim thiab cohesive, ua kom muaj txiaj ntsig zoo hauv ntau daim ntawv thov uas yuav tsum tau tsim cov yeeb yaj kiab.
Thickening Agent: Ib qho ntawm cov kev siv tseem ceeb ntawm HEC yog ua tus neeg sawv cev thickening nyob rau hauv ntau yam formulations, xws li tshuaj pleev ib ce, tshuaj, thiab cov khoom tu tus kheej.
Kev siv ntawm Hydroxyethylcellulose:
Tshuaj pleev ib ce thiab kho tus kheej cov khoom: HEC yog dav siv nyob rau hauv cov tshuaj pleev ib ce thiab cov khoom tu tus kheej raws li ib tug thickener, stabilizer, thiab film-forming agent nyob rau hauv cov khoom xws li tshuaj pleev ib ce, cream, tshuaj zawv plaub hau, thiab tshuaj txhuam hniav.
Pharmaceuticals: Nyob rau hauv cov tshuaj formulations, HEC ua hauj lwm raws li ib tug suspending agent, binder, thiab tswj-tso matrix nyob rau hauv cov ntsiav tshuaj coatings thiab qhov ncauj formulations.
Xim thiab Txheej: HEC yog siv rau hauv cov xim dej thiab cov txheej txheem ua cov thickener thiab rheology modifier los tswj viscosity thiab txhim kho daim ntawv thov.
Kev Lag Luam Khoom Noj: Hauv kev lag luam khoom noj khoom haus, HEC yog siv los ua cov khoom ua kom tuab thiab ruaj khov hauv cov khoom xws li kua ntses, hnav khaub ncaws, thiab cov khoom siv mis nyuj.
Natural lossis Synthetic Classification Debate:
Kev faib tawm ntawm hydroxyethylcellulose raws li ntuj los yog hluavtaws yog muaj kev sib cav.Nov yog cov lus sib cav los ntawm ob qhov kev xav:
Cov lus sib cav rau Classification li Synthetic:
Kev Hloov Kho Tshuaj: HEC yog muab los ntawm cellulose los ntawm kev hloov tshuaj lom neeg uas cuam tshuam nrog cov tshuaj tiv thaiv cellulose nrog ethylene oxide.Qhov kev hloov tshuaj lom neeg no suav tias yog hluavtaws hauv qhov xwm txheej.
Kev Tsim Kho Kev Lag Luam: HEC feem ntau yog tsim los ntawm cov txheej txheem kev lag luam uas cuam tshuam nrog kev tswj xyuas thiab kev ua kom huv, uas yog cov khoom siv hluavtaws sib xyaw.
Kev Hloov Kho Degree: Cov qib kev hloov pauv hauv HEC tuaj yeem tswj tau meej thaum lub sijhawm sib xyaw, qhia txog keeb kwm hluavtaws.
Cov lus sib cav rau Classification li Natural:
Muab los ntawm Cellulose: HEC yog qhov kawg muab tau los ntawm cellulose, ib tug natural polymer abundantly pom nyob rau hauv cov nroj tsuag.
Cov Khoom Siv Txuas Ntxiv: Cellulose, cov khoom pib rau HEC ntau lawm, yog tau los ntawm cov khoom siv txuas ntxiv dua tshiab xws li ntoo pulp thiab paj rwb.
Biodegradability: Zoo li cellulose, HEC yog biodegradable, tawg mus rau hauv cov khoom tsis zoo hauv ib puag ncig lub sijhawm.
Kev ua haujlwm zoo ib yam rau Cellulose: Txawm hais tias kev hloov kho tshuaj, HEC khaws ntau yam khoom ntawm cellulose, xws li solubility hauv dej thiab biocompatibility.
Hydroxyethylcellulose yog ntau yam polymer muab los ntawm cellulose los ntawm kev hloov kho tshuaj.Thaum nws cov khoom tsim muaj cov tshuaj tiv thaiv hluavtaws thiab cov txheej txheem kev lag luam, nws yog qhov kawg muab tau los ntawm lub ntuj thiab txuas ntxiv mus.Kev sib cav txog seb HEC yuav tsum raug cais raws li ntuj lossis hluavtaws qhia txog qhov nyuaj ntawm kev txhais cov ntsiab lus no hauv cov ntsiab lus ntawm kev hloov pauv ntuj polymers.Txawm li cas los xij, nws cov biodegradability, txuas ntxiv mus, thiab kev ua haujlwm zoo sib xws rau cellulose qhia tias nws muaj cov yam ntxwv ntawm ob qho tib si ntuj thiab hluavtaws sib txuas, qhov muag plooj ntawm thaj tsam ntawm ob qhov kev faib tawm.
Post lub sij hawm: Apr-01-2024