Hydroxypropyl methylcellulose (INN zita: Hypromellose), zvakare rakarerutswa se hypromellose (hydroxypropyl methylcellulose, yakapfupikiswa se.HPMC), yakasiyana-siyana yenonionic cellulose yakasanganiswa ethers. Iyo semi-synthetic, isingashande, viscoelastic polymer inowanzoshandiswa semafuta ekuzora muophthalmology, kana semubatsiri kana excipient mumishonga yemuromo, uye inowanzowanikwa mune dzakasiyana siyana zvigadzirwa zvekutengesa.
Sekuwedzera kwechikafu, hypromellose inogona kutamba mabasa anotevera: emulsifier, thickener, suspending agent uye inotsiva mhuka gelatin. Iyo kodhi (E-code) muCodex Alimentarius ndeye E464.
Chemical properties:
Chigadzirwa chakapedzwa chehydroxypropyl methylcelluloseihupfu chena kana chena yakasununguka fibrous yakasimba, uye saizi yechikamu inopfuura nepa80-mesh sieve. Chiyero chemukati methoxyl kuhuwandu hwehydroxypropyl yechigadzirwa chakapedzwa chakasiyana, uye viscosity yakasiyana, saka inova mhando dzakasiyana-siyana dzine maitiro akasiyana. Iyo ine hunhu hwekunyungudika mumvura inotonhora uye isinganyungudika mumvura inopisa yakafanana nemethyl cellulose, uye kunyungudika kwayo mu organic solvents inodarika iyo yemvura. Inogona kunyungudutswa mune anhydrous methanol uye ethanol, uye inogona zvakare kunyungudika mumahydrocarboni ane chlorine akadai se dichloro methane, trichloroethane, uye organic solvents senge acetone, isopropanol, uye diacetone doro. Kana yanyungudutswa mumvura, inosanganiswa nemamorekuru emvura kuita colloid. Yakagadzikana kune acid uye alkali, uye haina kukanganiswa muhuwandu hwepH = 2 ~ 12. Hypromellose, kunyange isiri-chepfu, inopfuta uye inopindirana nechisimba neoxidizing agents.
Iyo viscosity yezvigadzirwa zveHPMC inowedzera nekuwedzera kwekufungidzirwa uye uremu hwemamorekuru, uye kana tembiricha yakwira, viscosity yayo inotanga kuderera. Kana yasvika kune imwe tembiricha, viscosity inongoerekana yasimuka uye gelation inoitika. urefu hwe. Mushonga waro wemvura wakagadzikana pakupisa kwekamuri, kunze kwekuti inogona kuderedzwa nema enzymes, uye viscosity yayo yose haina kukanganisa kwechiitiko. Iyo ine yakakosha thermal gelation properties, yakanaka film-forming properties uye pamusoro pebasa.
Kugadzira:
Mushure mokunge cellulose ichibatwa nealkali, iyo alkoxy anion inogadzirwa nekuderera kweboka re hydroxyl inogona kuwedzera propylene oxide kuti ibudise hydroxypropyl cellulose ether; inogona zvakare kunyungudika nemethyl chloride kugadzira methyl cellulose ether. Hydroxypropyl methylcellulose inogadzirwa kana maitiro ese ari maviri akaitwa panguva imwe chete.
Kushandisa:
Kushandiswa kwehydroxypropyl methylcellulose kwakafanana kune mamwe ma cellulose ethers. Inonyanya kushandiswa se dispersant, kumisa agent, thickener, emulsifier, stabilizer uye adhesive mundima dzakasiyana-siyana. Iyo yakakwirira kune mamwe cellulose ethers maererano nekunyungudika, dispersibility, pachena uye enzyme kuramba.
Muindasitiri yezvekudya uye yemishonga, inoshandiswa sekuwedzera. Inoshandiswa seanonamira, thickener, dispersant, Emollient, stabilizer uye emulsifier. Iyo haina chepfu, haina kukosha kwekudya, uye haina metabolic shanduko.
Pamusoro pe,HPMCine maapplication musynthetic resin polymerization, petrochemicals, ceramics, papermaking, dehwe, cosmetics, machira, zvekuvaka uye photosensitive kudhinda ndiro.
Nguva yekutumira: Kubvumbi-25-2024