Hydroxypropyl methylcellulose(Izina rya INN:Hypromellulose), mu magambo ahinnye nkahydroxypropyl methylcellulose (HPMC), ni ubwoko butandukanye bwa ionic selulose ivanze na ethers.Nibice bibiri bya sintetike, idakora, viscoelastic polymer ikunze gukoreshwa nkamavuta yo kwisiga, cyangwa nkumugereka cyangwa udasanzwe mubuvuzi bwo mumunwa, bikunze kuboneka mubwoko butandukanye bwibicuruzwa.
Nkinyongeramusaruro, hydroxypropyl methylcellulose irashobora kugira uruhare rukurikira: emulifisiyeri, umubyimba, umukozi uhagarika, hamwe nuwasimbuye gelatine.Codex yayo Alimentarius code ni E464.
umutungo wa shimi
Igicuruzwa cyarangiye cyahydroxypropyl methyl seluloseni ifu yera cyangwa yera yera fibrous ikomeye, hamwe nubunini buke bwanyuze mumashanyarazi 80.Ibipimo bitandukanye byimikorere ya hydroxypropyl hamwe nubwiza bwibicuruzwa byarangiye bituma iba ubwoko butandukanye hamwe nibitandukaniro mubikorwa.Ifite ibiranga gushonga mumazi akonje no kudashonga mumazi ashyushye asa na methylcellulose, kandi gukomera kwayo mumashanyarazi arenze ayo mumazi.Irashobora gushonga muri methanol ya anhydrous na Ethanol, hamwe na hydrocarbone ya chlorine nka dichloromethane, trichloroethane, hamwe na solge organic nka acetone, isopropanol, na alcool ya diacetone.Iyo ishonga mumazi, ihuza na molekile zamazi kugirango ikore colloid.Irahagaze kuri acide na base kandi ntabwo ihindurwa murwego rwa pH ya 2-12.Nubwo hydroxypropyl methylcellulose idafite uburozi, irashya kandi irashobora kwitwara nabi hamwe na okiside [5].
Ubukonje bwaIbicuruzwa bya HPMCyiyongera hamwe no kwiyongera kwibiro hamwe nuburemere bwa molekile.Iyo ubushyuhe buzamutse, ubukonje butangira kugabanuka.Iyo ubushyuhe bugeze ku bushyuhe runaka, ubukonje burazamuka gitunguranye kandi gel iba.Ubushyuhe bwa gel bwibicuruzwa bito cyane biri hejuru yibyo bicuruzwa byinshi.Igisubizo cyacyo cyamazi gihamye mubushyuhe bwicyumba kandi mubusanzwe nta kwangirika kwijimye usibye kwangirika kwimisemburo.Ifite imiterere yihariye yubushyuhe, firime nziza ikora imikorere nibikorwa byo hejuru.
Kwitegura
Nyuma ya selile imaze kuvurwa na alkali, anion ya alkoxy itangwa na hydroxyl deprotonation irashobora kongerwa kuri epoxy propane kugirango itangehydroxypropyl selulose ether;Irashobora kandi guhura na methyl chloride kugirango itange methyl selulose ether.Iyo ibisubizo byombi bibaye icyarimwe,hydroxypropyl methyl seluloseni Byakozwe.
intego
Ikoreshwa ryahydroxypropyl methyl seluloseni Nkaselile ethers, ikoreshwa cyane nka dispersant, agent yo guhagarika, kubyimba, emulifier, stabilisateur, hamwe no gufatira mubice bitandukanye.Iruta izindi selile ya selile muburyo bwo gukemura, gutatanya, gukorera mu mucyo, no kurwanya enzyme.
Mu nganda z’ibiribwa n’imiti, ikoreshwa nk'inyongera.Bitewe nuburyo bufatika, imiterere ya firime, kubyimba no gutatanya mumazi, hamwe nubushobozi bwayo bwo kwirinda amavuta kwinjira no kubungabunga ubushuhe, ikoreshwa nkibifata, ibyimbye, bikwirakwiza, byorohereza, stabilisateur, na emulifier.Ntabwo ifite uburozi, nta gaciro kintungamubiri, kandi nta mpinduka ihinduka.
Byongeye,HPMCifite porogaramu muburyo bwa sintetike ya resin polymerisiyonike, peteroli-chimique, ububumbyi, gukora impapuro, uruhu, kwisiga, gutwikira, ibikoresho byubaka, hamwe nibyapa byandika.
Igihe cyo kohereza: Nzeri-04-2023