I-Cellulose Ether Derivatives iyisigaba sama-polymers wemvelo aguqulwe ngamakhemikhali. Ngenxa ye-solubility yabo enhle kakhulu, ukusebenza kwe-viscosity ukulungiswa kanye nokuzwela kwezimo zangaphandle njengokushisa kanye ne-pH, kusetshenziswa kabanzi ezintweni zokwakha, izimbotshana, imithi, ukudla nezimonyo. Umsebenzi wokulawula we-Viscosity we-cellulose ether ungenye yezimpawu eziyinhloko zesicelo sazo esibanzi ezisetshenzisweni eziningi zezimboni nezinsuku zansuku zonke.
1. Ukwakheka kanye nokuhlukaniswa kwe-Cellulose Afers
I-CelLeLose Ether Derivatives ilungiselelwe kusuka ku-cellulose yemvelo ngokuphendula okuthe xaxa. I-Cellulose iyikhompiyutha ye-polymer eyakhiwe ngama-glucose monomers axhunywe ngama-β-1,4-glycosidic bond. Inqubo yokulungiselela ye-cellulose ether ihlanganisa ukuphendula i-hydroxyl (-oh) ingxenye ye-cellulose ene-ejenti yokusheshisa ukukhiqiza izinto ezehlukene (njenge-methoxy, hycloxylylyl, njll.).
Ngokuya nge-subspeent, i-cellulose ether derivatives ifaka phakathi i-methyl cellulose (MC), i-hpdroxypypropyls (HPMC), i-cardboxypropyl methylulose (i-CHCC), njll. Inombolo nesikhundla sokufakazela akunakuthinta kuphela i-solubility yamanzi ye-cellulose afesther, kodwa futhi zihlobane ngokuqondile nokubonakala kwazo okwakha amandla ezixazululweni zamanzi.
2. Indlela yokulungisa ukwakheka
I-viscosity eqondisa umphumela we-cellulose, izithambiso ikakhulukazi ezivela ekuchithelweni kwawo emanzini nokuziphatha okwengeziwe kwamaketanga ama-molecular. Lapho izithambiso ze-cellulose zichithwa emanzini, amaqembu ama-polar akha ama-hydrogen bond ngama-molecule wamanzi, okwenza amaketanga ama-molecule angama-cellulose avele emanzini, futhi angenise "ukungqubuzana kwangaphakathi kwekhambi.
Ubukhulu be-viscosity buhlobene kakhulu nesisindo se-molecular, uhlobo olubekiwe, degree lokufaka esikhundleni (DS) kanye ne-degree of polymerization (DP) ye-cellulose afebur. Ngokuvamile, ubukhulu besisindo se-molecular of cellulose izithathekisa kanye nochungechunge lwamangqamuzana, ukukhuphuka kwesixazululo sekhambi. Ngasikhathi sinye, ukufakwa esikhundleni okuhlukile kuthinta i-hydrophicicity yama-molecule e-cellulose ether, futhi ngaleyo ndlela kuthinta i-solubility yabo nokuvunywa emanzini. Isibonelo, i-HPMC ine-solubility enhle yamanzi kanye nokuqina kwe-viscoxypropylyl kanye ne-methyl substitunts. I-CMC, noma kunjalo, inokubona okuphezulu ngoba yethula amaqembu e-carboxyl afanelekile, angasebenzisana ngokuqinile ngama-molecule wamanzi esikhangisweni samanzi.
I-3. Umphumela wezinto zangaphandle ekuboneni
I-viscosity ye-cellulose ether incike ekwakhekeni kwayo kuphela, kodwa futhi nasezicini zemvelo zangaphandle, kufaka phakathi izinga lokushisa, i-PH VALUE, njll.
3.1 izinga lokushisa
Ukushisa kuyinto ebalulekile ethinta ukubonakala kwe-cellulose ether ether. Ngokuvamile, ukubonakala kwe-cellulose ether solution kuncipha ngokushisa okuthuthukile. Lokhu kungenxa yokuthi izinga lokushisa elikhulayo lisheshisa ukunyakaza kwamangqamuzana, libangela ukuxhumanisa phakathi kwama-molecule, futhi kubangele ukuba amaketanga ama-cellulose ama-molecular emanzini akhuphuke, anciphise umphumela obophayo kuma-molecule wamanzi, ngaleyo ndlela anciphise i-viscosity. Kodwa-ke, ezinye izithako ze-cellulose (ezifana ne-HPMC) zibonisa izici ze-gelation ezishisayo ngaphakathi kobubanzi bokushisa, okungukuthi, njengoba izinga lokushisa likhuphuka, isixazululo sokuhlola sanda futhi ekugcineni sandisa ijeli.
Inani le-3.2 PH
Inani le-PH libuye libe nomthelela omkhulu ekubonisweni kwe-cellulose ether. Nge-Cellulose Afers enobuthi be-Ionic (njenge-CMC), inani le-PH lithinta isimo senkokhelo yabathathwe kwikhambi, ngaleyo ndlela kuthinta ukuxhumana phakathi kwama-molecule kanye nokuvunywa kwesixazululo. At High Values, i-Carboxyl Group i-Ionised ngokwengeziwe, okuholela ekuphuthumeni okunamandla kagesi, okwenza i-chain molecular kube lula ukwenzeka futhi ikhulise ukwanda; Ngenkathi usezingeni eliphansi le-PH, iqembu le-carboxyl alikho kalula i-IONIRED, ukukhishwa kwe-elektrostiki kuncishisiwe, ama-curls we-molecular chain, futhi i-visa iyancipha.
I-3.3 ion okuhlushwa
Umphumela wokuhlushwa kwe-Ion ekubonakaleni kwe-cellulose ether kusobala ikakhulukazi. I-Cellulose Ether ene-Ionic Supply izothintwa ngumphumela wokuvikelwa kwama-ion wangaphandle kusixazululo. Njengoba ukugxila kwe-ion kusolo kukhuphuka, ama-ion angaphandle azokwenza buthaka ukuthuthukiswa kwama-electrostatic phakathi kwama-molecule we-cellulose ether, okwenza i-cell curl curl ngokuqinile, ngaleyo ndlela kunciphise ukubonwa kwesixazululo. Ikakhulu endaweni enosawoti ephakeme, i-viscosity ye-CMC izokwehla kakhulu, okukubaluleke kakhulu kokwakheka kwesicelo.
4. Ukulawulwa kwe-Viscosity kuzinkundla zohlelo lokusebenza
I-Celsulose Ether isetshenziswe kabanzi emikhakheni eminingi ngenxa yokusebenza kwayo okuhle kakhulu kokusevo.
4.1 Izinto zokwakha
Ezintweni zokwakha, i-ether ye-cellulose (enjenge-HPMC) ivame ukusetshenziselwa udaka oluhlanganisiwe, i-putty adhesive neminye imikhiqizo ukulungisa i-viscosity yengxube futhi uthuthukise i-fluosity kanye nezakhiwo ezilwa nokuvimbela ngesikhathi sokwakha. Ngasikhathi sinye, futhi ingabambezela ukuhwamuka kwamanzi, thuthukisa ukugcinwa kwamanzi izinto zokwakha, futhi ngaleyo ndlela uthuthukise amandla nokuqina komkhiqizo wokugcina.
4.2 I-Coatings ne-Inks
I-Cellulose Tashers Act njengezinhlanga kanye nokuzimisa egqoke izimbotshana ezisuselwa emanzini kanye nama-inks. Ngokushintsha i-viscosity, baqinisekisa izinga lokulinganisa nokunamathelisa kokuhlanganiswa ngesikhathi sokwakha. Ngaphezu kwalokho, futhi futhi ukuthuthukisa ukuguquguquka kwe-anti-ye-coating, kunciphise ukugcwala, futhi wenze ukwakhiwa kufana.
4.3 Medicine nokudla
Emakhaleni e-Medicine kanye nokudla, izithambiso ze-cellulose (njenge-HPMC, i-CMC) zivame ukusetshenziswa njengabakhulu, ama-emulsifiers noma abaqinisi. Isibonelo, i-HPMC, njenge-coating impahla yamathebulethi, ingafinyelela umphumela wokukhishwa kwezidakamizwa ngokulawula ngokulawula izinga lokuchithwa. Ekudleni, i-CMC isetshenziselwa ukwandisa ukubonakala, ithuthukise ukunambitheka, futhi yandise impilo yeshelufu yokudla.
4.4 Izimonyo
Ukusetshenziswa kwe-cellulose Tashers ku-cosmetics ikakhulukazi kugxile kwimikhiqizo efana nama-emulsion, ama-gels kanye namaski ebusweni. Ngokushintsha i-viscosity, ama-cellulose afers anganikeza umkhiqizo ofanele kanye nokuthungwa, futhi wakhe ifilimu elinomswakama esikhunjeni ukwandisa induduzo ngesikhathi sokusebenzisa.
I-Cellulose Ether Derivatives ingalawula ngempumelelo ukubonwa kwezixazululo ngokusebenzisa ukwakheka kwabo okuhlukile kwamangqamuzana kanye nokuphendula endaweni yangaphandle. Lokhu kuholele ekusetshenzisweni kwawo okubanzi emikhakheni eminingi efana nokwakha, umuthi, ukudla nezimonyo. Ngokuthuthuka okuqhubekayo kwesayensi nobuchwepheshe, imisebenzi ye-Cellulose Afers izokwandiswa futhi ukunwetshwa ukuze kunikeze ngezixazululo zokulawula okuqondile kwe-viscosity ukuze uthole amasimu amaningi.
Isikhathi sePosi: Feb-17-2025