Hydroxypropyl methylcellulose yog siv(INN npe:Hypromellulose), kuj abbreviated liHydroxypropyl methylcellulose yog ib qho khoom siv zoo (HPMC), yog ntau yam uas tsis yog ionic cellulose sib xyaw ethers.Nws yog ib qho khoom siv hluav taws xob, tsis muaj zog, viscoelastic polymer feem ntau siv los ua cov roj nplua nyeem hauv ophthalmology, lossis ua ib qho khoom siv los yog cov khoom siv hauv qhov ncauj, feem ntau pom nyob rau hauv ntau hom khoom.
Raws li cov khoom noj khoom haus ntxiv, hydroxypropyl methylcellulose tuaj yeem ua lub luag haujlwm hauv qab no: emulsifier, thickener, suspension agent, thiab hloov pauv tsiaj gelatin.Nws Codex Alimentarius code yog E464.
chemical khoom
Cov khoom tiav ntawmhydroxypropyl methyl celluloseyog cov hmoov dawb los yog dawb xoob fibrous khoom, nrog ib qho me me dhau los ntawm 80 mesh sieve.Qhov sib txawv ntawm methoxy thiab hydroxypropyl cov ntsiab lus thiab viscosity ntawm cov khoom tiav ua rau nws muaj ntau yam sib txawv nrog qhov sib txawv ntawm kev ua haujlwm.Nws muaj cov yam ntxwv ntawm soluble hauv dej txias thiab insoluble hauv dej kub zoo ib yam li methylcellulose, thiab nws cov solubility hauv cov kuab tshuaj organic ntau tshaj li cov dej.Nws tuaj yeem soluble hauv anhydrous methanol thiab ethanol, nrog rau chlorinated hydrocarbons xws li dichloromethane, trichloroethane, thiab cov kuab tshuaj organic xws li acetone, isopropanol, thiab diacetone cawv.Thaum yaj hauv dej, nws ua ke nrog cov dej molecules los ua ib qho colloid.Nws ruaj khov rau cov kua qaub thiab cov hauv paus thiab tsis cuam tshuam nrog pH ntau ntawm 2-12.Txawm hais tias hydroxypropyl methylcellulose yog non-toxic, nws yog flammable thiab tuaj yeem hnov mob hnyav nrog oxidants [5].
Lub viscosity ntawmHPMC cov khoomnce nrog nce concentration thiab molecular hnyav.Thaum kub nce, viscosity pib poob.Thaum qhov kub nce mus txog qhov ntsuas kub, qhov viscosity dheev nce thiab gel tshwm sim.Cov gel kub ntawm cov khoom uas tsis muaj viscosity yog siab dua li cov khoom muaj viscosity siab.Nws cov tshuaj aqueous yog ruaj khov ntawm chav tsev kub thiab feem ntau tsis muaj degradation ntawm viscosity tsuas yog rau enzymatic degradation.Nws muaj cov khoom tshwj xeeb thermal gelling, zoo zaj duab xis tsim kev ua tau zoo thiab ua haujlwm saum npoo.
Kev npaj
Tom qab cellulose raug kho nrog alkali, alkoxy anion tsim los ntawm hydroxyl deprotonation tuaj yeem muab ntxiv rau epoxy propane los tsimhydroxypropyl cellulose ether;Nws kuj tseem tuaj yeem sib xyaw nrog methyl chloride los tsim methyl cellulose ether.Thaum ob qho kev tshwm sim tshwm sim ib txhij,hydroxypropyl methyl celluloseyog tsim.
lub hom phiaj
Kev siv ntawmhydroxypropyl methyl cellulosezoo ib yam li lwm yamcellulose ethers, feem ntau yog siv los ua dispersant, suspension agent, thickener, emulsifier, stabilizer, thiab nplaum nyob rau hauv ntau yam teb.Nws yog superior rau lwm cov cellulose ethers nyob rau hauv cov nqe lus ntawm solubility, dispersibility, transparency, thiab enzyme kuj.
Hauv kev lag luam khoom noj thiab tshuaj, nws yog siv los ua ib qho ntxiv.Vim nws cov khoom nplaum, zaj duab xis tsim, thickening thiab dispersion hauv cov kua, nrog rau nws lub peev xwm los tiv thaiv cov roj nkag thiab tswj cov dej noo, nws yog siv los ua cov nplaum, thickener, dispersant, reliever, stabilizer, thiab emulsifier.Nws tsis muaj tshuaj lom, tsis muaj zaub mov muaj txiaj ntsig, thiab tsis muaj kev hloov pauv hauv metabolic.
Ntxiv rau,HPMCmuaj cov ntawv thov hauv cov khoom siv hluavtaws polymerization, petrochemicals, ceramics, papermaking, tawv, tshuaj pleev ib ce, coatings, cov ntaub ntawv hauv tsev, thiab cov ntawv luam tawm photosensitive.
Post lub sij hawm: Sep-04-2023