IHydroxypropyl methylcellulose (igama le-INN: Hypromellose), ekwayenziwe lula njenge-hypromellose (i-hydroxypropyl methylcellulose, efinyeziweyo njengeHPMC), luhlobo lwe-nonionic cellulose exutywe ne-ethers. Yi-semi-synthetic, engasebenzi, i-viscoelastic polymer edla ngokusetyenziswa njenge-lubricant kwi-ophthalmology, okanye njenge-excipient okanye i-excipient kumayeza omlomo, kwaye iqhele ukufunyanwa kwiimveliso ezahlukeneyo zorhwebo.
Njengesongezo sokutya, i-hypromellose inokudlala indima elandelayo: i-emulsifier, i-thickener, i-agent yokumisa kunye nokuthatha indawo ye-gelatin yezilwanyana. Ikhowudi yayo (i-E-code) kwi-Codex Alimentarius yi-E464.
Iimpawu zekhemikhali:
Imveliso egqityiweyo yeihydroxypropyl methylcellulosengumgubo omhlophe okanye omhlophe okhululekileyo oqinileyo oqinileyo, kwaye ubungakanani bamasuntswana budlula kwisisefo se-80-mesh. Umlinganiselo womxholo we-methoxyl kumxholo we-hydroxypropyl wemveliso egqityiweyo uhlukile, kwaye i-viscosity iyahluka, ngoko iba yindidi yeentlobo ezahlukeneyo zentsebenzo. Ineempawu zokunyibilika kumanzi abandayo kwaye ayinyibiliki emanzini ashushu afana ne-methyl cellulose, kwaye ukunyibilika kwayo kwi-solvents yezinto eziphilayo kudlula amanzi. Inokunyibilika kwi-anhydrous methanol kunye ne-ethanol, kwaye inokunyibilika kwi-hydrocarbons eneklorini efana ne-dichloro methane, i-trichloroethane, kunye nezinyibilikisi ze-organic ezifana ne-acetone, isopropanol, kunye ne-diacetone alcohol. Xa inyibilika emanzini, iya kudibanisa kunye neemolekyuli zamanzi ukwenza i-colloid. Izinzile kwi-asidi kunye ne-alkali, kwaye ayichaphazeleki kuluhlu lwe-pH = 2 ~ 12. I-Hypromellose, nangona i-non-toxic, inokutsha kwaye isabela ngobundlobongela kunye ne-oxidizing agents.
I-viscosity yeemveliso ze-HPMC yanda ngokunyuka koxinzelelo kunye nobunzima be-molecular, kwaye xa ubushushu buphakama, i-viscosity yayo iqala ukuhla. Xa ifikelela kwiqondo lokushisa elithile, i-viscosity iphakama ngokukhawuleza kwaye i-gelation iyenzeka. ukuphakama kwe. Isisombululo saso samanzi sizinzile kwiqondo lokushisa, ngaphandle kokuba sinokuchithwa ngama-enzymes, kwaye i-viscosity yayo ngokubanzi ayinayo into yokuthotywa. Ineempawu ezikhethekileyo ze-thermal gelation, iipropati ezilungileyo zokwenza ifilimu kunye nomsebenzi ongaphezulu.
Ukwenza:
Emva kokuba i-cellulose iphathwe nge-alkali, i-alkoxy anion eyenziwa yi-deprotonation yeqela le-hydroxyl inokongeza i-propylene oxide ukuvelisa i-hydroxypropyl cellulose ether; Iyakwazi ukujiya nge-methyl chloride ukwenza i-methyl cellulose ether. IHydroxypropyl methylcellulose iveliswa xa zombini iimpendulo ziqhutywa ngaxeshanye.
Ukusebenzisa:
Ukusetyenziswa kwe-hydroxypropyl methylcellulose kuyafana nenye i-cellulose ethers. Isetyenziswa kakhulu njenge-dispersant, i-agent yokumisa, i-thickener, i-emulsifier, i-stabilizer kunye ne-adhesive kwiinkalo ezahlukeneyo. Iphezulu kunezinye i-cellulose ethers ngokubhekiselele kwi-solubility, dispersibility, transparency and resistance resistance.
Kwishishini lokutya kunye namayeza, lisetyenziswa njengesongezo. Isetyenziswe njenge-adhesive, thickener, dispersant, Emollient, stabilizer kunye ne-emulsifier. Ayinabutyhefu, ayinaxabiso lezondlo, kwaye akukho tshintsho lwemetabolism.
Ukwengeza,HPMCinee-aplikeshini kwi-synthetic resin polymerization, i-petrochemicals, i-ceramics, i-papermaking, i-leather, izithambiso, i-coatings, izinto zokwakha kunye neepleyiti zokuprinta ze-photosensitive.
Ixesha lokuposa: Apr-25-2024