Yiziphi izithako ze-hydroxyethyl cellulose?

IHydroxYethyl Cellulose (HEC) iyinhlangano ebalulekile ye-nonionable polymer ebalulekile ye-cellulose ether yamakhompiyutha. Itholakala ngokusabela kokusheshisa kwe-cellulose yemvelo nge-ethylene oxide (ethylene oxide) ngaphansi kwezimo ze-alkaline. I-Hydroxyyethyl celtulose iyi-polysaccharide ye-polysaccharide ye-glucose ye-cellucose ehlelweni lwamakhemikhali, futhi amanye amaqembu ama-hydroxyl afakwa esikhundleni samaqembu e-hydroxyethyl ukwakha i-hydroxyethyl pultuleose.

Izithako kanye nesakhiwo samakhemikhali
Ukwakheka kwamangqamuzana kwe-hydroxyethyl celtulose ikakhulukazi kufaka phakathi lezi zingxenye ezilandelayo:

I-Cellulose Backbone: I-cellulose iyi-polysaccharide yemvelo, isakhi esiyinhloko sawo yiqoqo le-glucose amayunithi axhunywe ngama-β-1,4-glycosidic bond. Lesi sakhiwo se-cellulose siyinikeza i-crystaltaltity ephezulu namandla ngokomzimba.

IHydroxYethyl substoent I-Hydroxyyethyl cellulose ikhiqizwa ukwethula amaqembu we-hydroxyethyl (-ch2ch2oh) emaqenjini ama-hydroxyl ngokusebenzisa ukusabela kwe-hydroxyl phakathi kwalawa maqembu we-hydroxyl kanye ne-ethylene oxide. Ukwethulwa kwalaba bantu kunciphisa i-crystaltaltity ye-cellulose, kuthuthukisa i-solubility yayo yamanzi, futhi kwenze kubonise ukuqina okuhle kanye ne-viscoeliastity kusisombululo esinamanzi.

Isisindo samangqamuzana kanye nesilinganiso sokufakwa esikhundleni se-molecular: isisindo samangqamuzana kanye nesilinganiso sokufakwa esikhundleni (ie, inani lamaqembu ama-hydroxyyl afakwe esikhundleni soyunithi ngalinye le-glucose) ye-hydroxyethyl cellulose yizici ezimbili ezibalulekile ezithinta izakhiwo zayo. Ngokuvamile, i-hydroxyyethyl cellulose enesisindo esiphakeme samangqamuzana inokuvunywa okungcono kanye nekhono lokuqina, kanti izinga eliphakeme lokufakwa esikhundleni senyuka lithuthukisa i-solubility yalo yamanzi nokuqina.

Izakhiwo ze-Physichicochemical ze-hydroxyethyl cellulose
Ngenxa yesakhiwo sayo esiyingqayizivele, i-hydroxyyethyl cellulose ikhombisa uchungechunge lwezindawo ezinhle kakhulu ze-physicochemical:

I-allobulity yamanzi: I-Hydroxyyethyl celtulose ilulaza kalula emanzini abandayo nawe-Hot ukwakha isixazululo esicacile noma esincanyana seClowloidal. Inqubo yayo yokuchithwa ayithinteki kakhulu ngenani le-PH futhi ihlala iqinile ngaphezu kobubanzi be-PH (ngokuvamile phakathi kuka-2 no-12).

Ukuqina Njengoba okuhlushwa kukhuphuka, ukubonakala kwesixazululo kukhuphuka ngokweqile, ngakho-ke kusetshenziswa kabanzi ezinkambeni zezimboni ezidinga abakhulu.

Umsebenzi ongaphezulu: Njengoba i-hydroxyethyllllll molecule inamaqembu we-hydrophilic kanye namathambo ama-hydrophobic, kunganciphisa ukungezwani kwamanzi kukhambi futhi kukhombisa umsebenzi othile ongaphezulu. Le mpahla yenza kube lusetshenziselwe ukumbona, ama-inks nakwezinye izinkambu, futhi kungathuthukisa uketshezi kanye nezakhiwo zenhlanganisela zomkhiqizo.

Ukuqina: I-Hydroxyyethyl cellulose inokuqina okuhle kwikhambi elinamanzi, kungamelana nethonya le-General Oxidants kanye nokukhanya, futhi lizinzile ngaphansi kwezimo ze-acid ne-alkali. Ngeke yehliswe ama-microorganisms amaningi kusisombululo esinamanzi, ngakho-ke akulula ukuwohloka ngesikhathi sokugcina.

I-BioCOMTIL NOKUPHEPHA: I-Hydroxyyethyl cellulose isetshenziswa kabanzi ekudleni, izimonyo kanye nomuthi ngoba itholakala kwi-morlulose yemvelo futhi isagcina ukufana okuhle nokubuthika okuphansi ngemuva kokuguqulwa kwamakhemikhali. Isibonelo, isetshenziswa njengesikhudlwana kanye ne-stabilizer ekudleni, njengezinkuthazo ezihlekisayo ne-emulsifier kwezimonyo, futhi njenge-matrix ye-binder ne-matrix elawulwayo yamathebhulethi emithi.

Ukulungiselela kanye nesicelo
Ukulungiswa kweHydroxYethyl celtulose kuvame ukuhlukaniswa ngezinyathelo ezintathu: Alkalization of cellulose, ukusabela kokuthezeka, ukuhlanzwa nokomisa. Okokuqala, i-cellulose iphathwa ngaphansi kwezimo ze-alkali ukucupha amaqembu e-hydroxy e-cellulose, bese ephendula nge-ethylene oxide ukukhiqiza i-hydroxyethyyl cellulose. Ekugcineni, umkhiqizo wokugcina utholakala ngezinyathelo ezinjengokungathathi hlangothi, ukuhlanzwa nokuwomile.

I-Hydroxyyethyl cellulose isetshenziswa kabanzi kwezinto zokwakha (njengodaka kasimende kanye namakhemikhali), amakhemikhali nsuku zonke (anjengezimonyo nezimonyo zokulungiswa kwezidakamizwa), nomuthi wokukhishwa kwezidakamizwa (njengezinhlanga kanye nabaqinisi).

I-Hydroxyyethyl celtulose isetshenziswa kabanzi emikhakheni ehlukahlukene ngenxa yezakhiwo zayo ezinhle kakhulu zenyama nangamakhemikhali kanye nokuguquguquka okuhlukahlukene. Ubunye besakhiwo kanye nokwakheka kwalo bukuvumela ukuthi badlale indima ebalulekile ekukhulekeni, ekuvuseleleni, ukumiswa, ukwakheka kwamafilimu nokuzinza okubalulekile kwamakhemikhali.