Hydroxypropyl methylcellulose (INN name: Hypromellose), oo sidoo kale loo fududeeyay sida hypromellose (hydroxypropyl methylcellulose, oo loo soo gaabiyo sidaHPMC), waa noocyo kala duwan oo nonionic cellulose ethers isku dhafan. Waa semi-synthetic, aan firfircoonayn, polymer viscoelastic ah oo caadi ahaan loo isticmaalo saliidaha indhaha, ama ka-qaade ahaan ama ka-qaadista daawooyinka afka, waxaana caadi ahaan laga helaa alaabooyin ganacsi oo kala duwan.
Sida cunto lagu daro, hypromellose wuxuu ciyaari karaa doorarka soo socda: emulsifier, dhumuc weyn, wakiilka hakinta iyo beddelka jelatin xayawaanka. Koodhkiisa (E-code) ee Codex Alimentarius waa E464.
Waxyaabaha kiimikaad:
Alaabta dhammaatay eehydroxypropyl methylcellulosewaa budo cad ama caddaan dabacsan oo adag, oo cabbirka qaybku wuxuu dhex maraa shaandho 80-mesh ah. Saamiga methoxyl ee ku jira maadada hydroxypropyl ee alaabta la dhammeeyey way ka duwan tahay, iyo viscosity waa ka duwan yahay, sidaas darteed waxay noqotaa noocyo kala duwan oo leh bandhigyo kala duwan. Waxay leedahay sifooyinka lagu milmo biyaha qabow oo aan lagu milmin biyaha kulul oo la mid ah methyl cellulose, iyo milmaheeda dareeraha organic ayaa ka sarreeya biyaha. Waxaa lagu milmi karaa methanol anhydrous ah iyo ethanol, waxaana sidoo kale lagu milmi karaa hydrocarbons koloriin leh sida dichloro methane, trichloroethane, iyo dareerayaasha organic sida acetone, isopropanol, iyo khamriga diacetone. Marka lagu milmo biyaha, waxay ku dari doontaa molecules biyaha si ay u sameeyaan kolloid. Waxay u xasilloon tahay aashitada iyo alkali, mana saamayso inta u dhaxaysa pH=2 ~ 12. Hypromellose, inkasta oo aan sun ahayn, waa guban waxayna si ba'an uga falcelisaa walxaha oksaydhka ah.
Viscosity ee alaabta HPMC waxay kordhisaa korodhka feejignaanta iyo miisaanka kelli, iyo marka heerkulku kor u kaco, viscosity ay bilaabaan inay hoos u. Marka ay gaadho heerkul gaar ah, viscosity-ku si lama filaan ah ayuu u kacayaa oo jeexjeexu wuu dhacaa. dhererka. Xalkeeda aqueous waa mid deggan heerkulka qolka, marka laga reebo in ay hoos u dhigi karaan by enzymes, iyo viscosity guud ee ay leedahay ifafaale xaaluf ah. Waxay leedahay sifooyin kuleyl gaar ah oo kuleyl ah, sifooyin filim samaynta wanaagsan iyo dhaqdhaqaaqa dusha sare.
Samaynta:
Ka dib markii cellulose lagu daaweeyo alkali, alkoxy anion ay dhaliso deprotonation ee kooxda hydroxyl waxay ku dari kartaa propylene oxide si ay u abuurto ether hydroxypropyl cellulose; Waxa kale oo ay ku ururin kartaa chloride methyl si ay u dhaliso ether methyl cellulose. Hydroxypropyl methylcellulose waxa la soo saaraa marka labada falcelin isku mar la sameeyo.
Isticmaalka:
Isticmaalka hydroxypropyl methylcellulose wuxuu la mid yahay kuwa kale ethers cellulose. Waxaa inta badan loo isticmaalaa sida kala firdhiso, wakiilka hakadka ah, dhumuc weyn, emulsifier, xasiliyaha iyo koollada ee dhinacyo kala duwan. Way ka sarraysaa ether-yada kale ee cellulose marka la eego milanka, kala firdhinta, hufnaanta iyo iska caabbinta enzyme.
Warshadaha cuntada iyo dawooyinka, waxa loo isticmaalaa wax lagu daro. Waxa loo isticmaalaa sida xabag, dhumuc, kala firdhiye, Emollient, xasiliye iyo emulsifier. Ma laha wax sun ah, ma laha qiimo nafaqo, iyo isbeddel dheef-shiid kiimikaad ah.
Intaa waxaa dheer,HPMCwaxa uu leeyahay codsiyo ku jira polymerization resin synthetic, petrochemicals, ceramics, papermakers, harag, waxyaalaha la isku qurxiyo, dahaarka, qalabka dhismaha iyo taarikada daabacaadda sawir-qaadista.
Waqtiga boostada: Abriil-25-2024