Hydroxypropyl methylcellulose(INN zita:Hypromelulose), rakadimburirwawo sehydroxypropyl methylcellulose (HPMC), yakasiyana-siyana isiri ionic cellulose yakasanganiswa ethers.Iyo semi synthetic, isingashande, viscoelastic polymer inowanzoshandiswa semafuta ekuzora muophthalmology, kana seanosanganisa kana excipient mumushonga wemukanwa, unowanzo kuwanikwa mumhando dzakasiyana dzezvigadzirwa.
Sekuwedzera kwechikafu, hydroxypropyl methylcellulose inogona kutamba mabasa anotevera: emulsifier, thickener, suspension agent, uye chinotsiva mhuka gelatin.Iyo Codex Alimentarius kodhi ndeye E464.
makemikari pfuma
Chigadzirwa chakapedzwa chehydroxypropyl methyl celluloseihupfu chena kana kuti chena yakasununguka fibrous solid, ine particle size ichipfuura nepa80 mesh sieve.Izvo zvakasiyana-siyana zvemethoxy uye hydroxypropyl zvinyorwa uye viscosity yechigadzirwa chakapedzwa chinoita kuti zvive zvakasiyana-siyana zvakasiyana-siyana zvine misiyano mukushanda.Iyo ine hunhu hwekunyungudika mumvura inotonhora uye isinganyungudika mumvura inopisa yakafanana nemethylcellulose, uye kunyungudika kwayo mu organic solvents inodarika iyo yemvura.Inogona kunyungudika muanhydrous methanol uye ethanol, pamwe nemahydrocarboni ane chlorinated akadai sedichloromethane, trichloroethane, uye organic solvents senge acetone, isopropanol, uye diacetone doro.Kana yakanyungudutswa mumvura, inosanganiswa nemamorekuru emvura kuita colloid.Iyo yakagadzikana kune acids uye mabhesi uye haina kukanganiswa mukati meiyo pH renji ye2-12.Kunyange zvazvo hydroxypropyl methylcellulose isiri-chepfu, inogona kupisa uye inogona kuita zvechisimba ine oxidants [5].
Iyo viscosity yeHPMC zvigadzirwainowedzera nekuwedzera kwekufungisisa uye kurema kwema molecular.Kana kutonhora kuchikwira, viscosity inotanga kuderera.Kana tembiricha yasvika kune imwe tembiricha, viscosity inongoerekana yasimuka uye gel inoitika.Iyo tembiricha yegel yezvinhu zvakaderera viscosity yakakwira kupfuura iyo yepamusoro viscosity zvigadzirwa.Mhinduro yayo ine aqueous yakagadzikana pakudziya kwekamuri uye kazhinji haina kushatisa kwe viscosity kunze kwekunge enzymatic degradation.Iyo ine yakakosha thermal gelling properties, yakanaka firimu kugadzira kuita uye pamusoro pekuita.
Kugadzirira
Mushure mekunge cellulose yarapwa nealkali, iyo alkoxy anion inogadzirwa nehydroxyl deprotonation inogona kuwedzerwa kune epoxy propane kugadzira.hydroxypropyl cellulose ether;Inogona zvakare kunyungudika nemethyl chloride kugadzira methyl cellulose ether.Kana maitiro ese ari maviri aitika panguva imwe chete,hydroxypropyl methyl celluloseinogadzirwa.
chinangwa
Kushandiswa kwehydroxypropyl methyl cellulosezvakafanana nemamwecellulose ethers, inonyanya kushandiswa se dispersant, suspension agent, thickener, emulsifier, stabilizer, uye inonamatira munzvimbo dzakasiyana-siyana.Iyo yepamusoro kune mamwe cellulose ethers maererano nekunyungudika, dispersibility, pachena, uye enzyme kuramba.
Muindasitiri yezvekudya uye yemishonga, inoshandiswa sekuwedzera.Nekuda kwekunamira kwayo, firimu-kuumba zvimiro, kukora uye kupararira muzvinwiwa, pamwe nekugona kwayo kudzivirira kupinda kwemafuta uye kuchengetedza unyoro, inoshandiswa seanonamira, thickener, dispersant, reliever, stabilizer, uye emulsifier.Iyo haina chepfu, haina kukosha kwekudya, uye haina metabolic shanduko.
Pamusoro pe,HPMCine maapplication musynthetic resin polymerization reactions, petrochemicals, ceramics, papermaking, dehwe, cosmetics, machira, zvekuvakisa, uye photosensitive kudhinda ndiro.
Nguva yekutumira: Sep-04-2023