Hloov kho cellulose ethers yog ib pab pawg sib txawv ntawm cov tshuaj sib txuas uas tau muab los ntawm cellulose, ib lub ntuj polymer pom nyob rau hauv cov nroj tsuag cell phab ntsa.Cellulose yog ib tug linear saw polymer tsim los ntawm qabzib units txuas ua ke los ntawm β-1,4-glycosidic bonds.Nws yog lub ntuj tsim ntau tshaj plaws nyob rau hauv lub ntiaj teb thiab muaj ntau yam muaj txiaj ntsig zoo xws li lub zog siab, tsis tshua muaj siab, biodegradability, thiab rov ua dua tshiab.
Hloov kho cellulose ethers yog tsim los ntawm kev qhia ntau yam tshuaj lom neeg rau hauv cellulose molecule, uas hloov nws lub cev thiab tshuaj lom neeg zog.Qhov kev hloov kho no tuaj yeem ua tiav los ntawm ntau txoj hauv kev, suav nrog etherification, esterification, thiab oxidation.Cov txiaj ntsig tau hloov kho cellulose ethers muaj ntau yam kev siv hauv ntau yam lag luam, suav nrog zaub mov, tshuaj, tshuaj pleev ib ce, kev tsim kho, thiab textiles.
Ib hom kev hloov kho cellulose ether yog methyl cellulose (MC), uas yog tsim los ntawm reacting cellulose nrog methyl chloride.MC yog ib qho tsis-ionic, dej-soluble polymer uas yog dav siv los ua tus neeg sawv cev thickening nyob rau hauv cov khoom noj, raws li ib tug binder nyob rau hauv ceramics, thiab raws li ib tug txheej nyob rau hauv papermaking.MC muaj ntau qhov zoo dua lwm cov thickeners, xws li nws lub peev xwm los tsim cov gels pob tshab, nws tsis muaj toxicity, thiab nws tsis kam mus rau enzyme degradation.
Lwm hom kev hloov kho cellulose ether yog hydroxypropyl methyl cellulose (HPMC), uas yog tsim los ntawm reacting cellulose nrog ib tug sib tov ntawm propylene oxide thiab methyl chloride.HPMC yog ib qho tsis-ionic, dej-soluble polymer uas yog dav siv los ua cov thickening tus neeg sawv cev hauv cov khoom noj thiab cov khoom tu tus kheej, ua cov ntawv khi hauv cov tshuaj ntsiav tshuaj, thiab ua cov txheej hauv kev tsim kho kev lag luam.HPMC muaj ntau qhov zoo dua li lwm cov thickeners, xws li nws muaj peev xwm tsim cov gels ruaj khov ntawm qhov tsis tshua muaj siab, nws cov viscosity siab ntawm qhov kub thiab txias, thiab nws sib haum nrog ntau yam ntawm lwm cov khoom xyaw.
Carboxymethyl cellulose (CMC) yog lwm hom kev hloov kho cellulose ether uas yog tsim los ntawm reacting cellulose nrog monochloroacetic acid.CMC yog cov dej-soluble polymer uas tau siv dav los ua tus neeg sawv cev thickening, stabilizer, thiab emulsifier hauv cov khoom noj, tshuaj, thiab cov khoom tu tus kheej.CMC muaj ntau qhov zoo dua li lwm cov thickeners, xws li nws lub peev xwm los tsim cov gels pob tshab, nws muaj peev xwm tuav dej siab, thiab nws tsis kam mus rau enzyme degradation.
Ethyl cellulose (EC) yog ib hom kev hloov kho cellulose ether uas yog tsim los ntawm reacting cellulose nrog ethyl chloride.EC yog ib qho uas tsis yog-ionic, dej-insoluble polymer uas yog dav siv los ua txheej hauv kev lag luam kws tshuaj.EC muaj ntau qhov zoo dua li lwm cov txheej txheej, xws li nws lub peev xwm los tsim cov yeeb yaj kiab tsis tu ncua, nws cov viscosity tsawg, thiab nws tsis kam mus ya raws thiab cua sov.
Hydroxyethyl cellulose (HEC) yog lwm hom kev hloov kho cellulose ether uas yog tsim los ntawm reacting cellulose nrog ethylene oxide.HEC yog cov dej-soluble polymer uas tau siv dav los ua tus neeg sawv cev thickening hauv cov khoom tu tus kheej thiab ua cov ntawv khi hauv cov tshuaj ntsiav tshuaj.HEC muaj ntau qhov zoo dua li lwm cov thickeners, xws li nws lub peev xwm los tsim cov gels pob tshab, nws muaj peev xwm tuav tau dej siab, thiab nws sib haum nrog ntau yam ntawm lwm cov khoom xyaw.
Cov khoom thiab kev siv ntawm kev hloov kho cellulose ethers nyob ntawm ntau yam, xws li hom tshuaj lom neeg tau qhia, qib kev hloov pauv, qhov hnyav molecular, thiab solubility.Piv txwv li, nce qib ntawm kev hloov pauv ntawm MC lossis HPMC tuaj yeem ua kom lawv cov dej tuav tau thiab viscosity, thaum txo lawv cov solubility.Ib yam li ntawd, nce qhov hnyav molecular ntawm CMC tuaj yeem ua rau nws cov viscosity thiab nws lub peev xwm tsim cov gels, thaum txo nws cov dej tuav.
Kev siv ntawm kev hloov kho cellulose ethers yog ntau thiab ntau yam.Hauv kev lag luam khoom noj khoom haus, lawv tau siv los ua cov khoom ua kom tuab, stabilizers, thiab emulsifiers hauv ntau yam khoom, nrog rau cov kua zaub, kua ntses, hnav khaub ncaws, thiab khoom qab zib.Hloov kho cellulose ethers kuj tseem siv rau hauv kev tsim cov khoom noj muaj roj tsawg thiab cov calories tsawg, vim lawv tuaj yeem ua raws li kev ntxhib los mos thiab lub qhov ncauj ntawm cov rog tsis ntxiv calories.Tsis tas li ntawd, lawv tau siv los ua coatings thiab glazes hauv cov khoom noj khoom haus los txhim kho lawv cov tsos thiab lub neej txee.
Hauv kev lag luam kws tshuaj, hloov cellulose ethers yog siv los ua binders, disintegrants, thiab coatings hauv cov ntsiav tshuaj thiab tshuaj ntsiav.Lawv kuj tau siv los ua viscosity modifiers hauv cov kua formulations, xws li syrups thiab suspensions.Hloov kho cellulose ethers yog nyiam dua lwm cov excipients, raws li lawv yog inert, biocompatible, thiab muaj tsawg toxicity.Lawv kuj muaj kev tswj hwm qib siab ntawm kev tso tawm cov tshuaj, uas tuaj yeem txhim kho lawv cov txiaj ntsig thiab kev nyab xeeb.
Hauv kev lag luam tshuaj pleev ib ce, hloov cellulose ethers yog siv los ua thickeners, emulsifiers, thiab stabilizers hauv cream, tshuaj pleev, thiab gels.Lawv kuj tau siv los ua cov yeeb yaj kiab tsim hauv cov khoom siv tu plaub hau, xws li tshuaj zawv plaub hau thiab tshuaj pleev.Hloov kho cellulose ethers tuaj yeem txhim kho kev ntxhib los mos thiab zoo li ntawm cov khoom siv tshuaj pleev ib ce, nrog rau kev txhim kho lawv cov kev ua tau zoo thiab ruaj khov.
Hauv kev tsim kho kev lag luam, hloov cellulose ethers yog siv los ua thickeners, binders, thiab dej-retention agents hauv cement, mortar, thiab plaster.Lawv tuaj yeem txhim kho kev ua haujlwm, sib xws, thiab lub zog ntawm cov ntaub ntawv no, nrog rau txo lawv cov shrinkage thiab tawg.Hloov kho cellulose ethers kuj tseem siv los ua cov coatings thiab cov nplaum hauv cov phab ntsa thiab cov plag tsev.
Hauv kev lag luam textile, hloov cellulose ethers yog siv los ua tus neeg sawv cev thiab cov thickeners hauv kev tsim cov ntaub thiab cov xov paj.Lawv tuaj yeem txhim kho kev tuav thiab xaws khoom ntawm textiles, nrog rau txhim kho lawv lub zog thiab kav ntev.
Zuag qhia tag nrho, hloov kho cellulose ethers yog ntau yam thiab muaj txiaj ntsig sib txuas uas muaj ntau yam kev siv hauv ntau yam lag luam.Lawv muab ntau qhov zoo dua lwm cov polymers, xws li lawv cov biocompatibility, biodegradability, thiab cov xwm txheej tauj dua tshiab.Lawv kuj muaj kev tswj hwm qib siab ntawm lub cev thiab tshuaj lom neeg ntawm cov khoom, uas tuaj yeem txhim kho lawv cov kev ua tau zoo thiab kev ua tau zoo.Yog li ntawd, hloov cellulose ethers yuav ua tau lub luag haujlwm tseem ceeb hauv kev tsim cov khoom tshiab thiab cov khoom tshiab yav tom ntej.
Post lub sij hawm: Apr-22-2023