Ngaba uyazi malunga ne-hypromellose?

I-Hydroxypropyl methylcellulose (igama le-INN: i-Hypromellose), eyenziwe lula njenge-hypromellose (i-hydroxypropyl methylcellulose, efinyeziweyo njenge-HPMC), luhlobo lwe-nonionic cellulose exutywe 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 ye-hydroxypropyl methylcellulose ngumgubo omhlophe okanye umhlophe okhululekileyo oqinileyo oqinileyo, kwaye ubungakanani be-particle budlula kwi-80-mesh sieve.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 ichithwe 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.

Ukongeza, i-HPMC inezicelo kwi-synthetic resin polymerization, i-petrochemicals, i-ceramics, i-papermaking, i-leather, i-cosmetics, i-cosmetology, izinto zokwakha kunye neepleyiti zokuprinta ze-photosensitive.