I-Methylcellulose (MC) iyinto evamile ye-polymer eyenziwe ngamakhemikhali, i-ether ye-cellulose eguquliwe etholwe yi-methylating cellulose yemvelo. Ngenxa yezakhiwo zayo ezikhethekile zomzimba namakhemikhali, isetshenziswa kabanzi ekwakhiweni, ekudleni, emithini, kwezimonyo, ephepheni nasezimbotsheni.
1. Ukuhlelwa ngokwezinga lokushintshwa
I-degree of substitution (DS) isho inani elimaphakathi lamaqembu e-hydroxyl esikhundleni samaqembu e-methyl kuyunithi ngayinye ye-glucose ku-methylcellulose. Kunamaqembu ama-3 e-hydroxyl eringini ngayinye ye-glucose ye-molecule ye-cellulose engathathelwa indawo ngamaqembu e-methyl. Ngakho-ke, izinga lokufaka esikhundleni se-methylcellulose lingahluka kusuka ku-0 kuya ku-3. Ngokwezinga lokufaka esikhundleni, i-methylcellulose ingahlukaniswa ngezigaba ezimbili: izinga eliphezulu lokufaka esikhundleni kanye nezinga eliphansi lokushintsha.
Izinga eliphakeme lokushintshwa kwe-methylcellulose (DS> 1.5): Lolu hlobo lomkhiqizo lunezinga eliphezulu lokushintshwa kwe-methyl, ngakho lune-hydrophobic kakhulu, lunokuncibilika okuphansi kanye nokungazweli kahle kwamanzi. Kuvame ukusetshenziselwa izinto zokwakha, ukugqoka kanye nezinye izikhathi ezidinga izinga elithile le-hydrophobicity.
Izinga eliphansi lokushintshwa kwe-methylcellulose (DS <1.5): Ngenxa yokushintshwa kwe-methyl encane, lolu hlobo lomkhiqizo lune-hydrophilic, lunokuncibilika okungcono futhi lungancibilika emanzini abandayo. I-methylcellulose efakwe endaweni ephansi isetshenziswa kakhulu ezimbonini zokudla nezithaka imithi njenge-thickener, emulsifier and stabilizer.
2. Ukuhlukaniswa ngokusetshenziswa
Ngokusho kokusetshenziswa kwe-methylcellulose emikhakheni ehlukene, ingahlukaniswa izigaba ezimbili: i-industrial methylcellulose kanye nokudla kanye ne-methylcellulose yezemithi.
I-Industrial methylcellulose: Isetshenziswa kakhulu ekwakheni, ekufakeni, ekwenzeni amaphepha, e-ceramics nakwezinye izimboni njenge-thickener, i-adhesive, ifilimu yangaphambili, i-ejenti yokugcina amanzi, njll. ukuqina; embonini yokugqoka, i-methylcellulose ingakhuphula ukuzinza nokuhlakazeka kwezingubo.
I-methylcellulose yokudla nemithi: Ngenxa yezindawo zayo ezingenabuthi nezingenabungozi, i-methylcellulose isetshenziswa njengesengezo ekudleni nasemthini. Ekudlani, i-methylcellulose iwugqinsi ovamile kanye ne-emulsifier engakwazi ukuzinzisa isakhiwo sokudla futhi ivimbele ukuhlukaniswa noma ukuhlukaniswa; emkhakheni wezokwelapha, i-methylcellulose ingasetshenziswa njengegobolondo le-capsule, umthwali wezidakamizwa, futhi inomsebenzi wezidakamizwa ezikhishwa okuqhubekayo. Ukuhleleka nokuphepha kwayo kwenza i-methylcellulose idume kakhulu kule mikhakha emibili.
3. Ukuhlukaniswa nge-solubility
I-Methylcellulose ihlukaniswe ikakhulukazi izigaba ezimbili ngokuya nge-solubility: uhlobo oluncibilikayo lwamanzi abandayo kanye nohlobo oluncibilikayo lwe-organic.
I-methylcellulose encibilikayo emanzini abandayo: Lolu hlobo lwe-methylcellulose lungancibilika emanzini abandayo ukuze kwakheke isixazululo esisobala, se-viscous ngemva kokuqedwa. Ivame ukusetshenziswa ezimbonini zokudla kanye nemithi njenge-thickener noma ifilimu yangaphambili. Ukunyibilika kwalolu hlobo lwe-methylcellulose kuncipha ngokukhuphuka kwezinga lokushisa, ngakho lesi sici singasetshenziselwa ukulawula ukwakhiwa uma sisetshenziswa embonini yezokwakha.
I-Organic solvent soluble methylcellulose: Lolu hlobo lwe-methylcellulose lungancibilika kuma-organic solvents futhi luvame ukusetshenziswa kumapende, ama-coatings nezinye izimboni zezimboni ezidinga i-organic phase media. Ngenxa yezakhiwo zayo ezinhle zokwakha ifilimu kanye nokumelana namakhemikhali, ilungele ukusetshenziswa ngaphansi kwezimo ezinzima zezimboni.
4. Ukuhlukaniswa ngesisindo samangqamuzana (viscosity)
Isisindo samangqamuzana e-methylcellulose sinomthelela obalulekile ezindaweni zayo ezibonakalayo, ikakhulukazi ukusebenza kwe-viscosity kusixazululo. Ngokwesisindo samangqamuzana, i-methylcellulose ingahlukaniswa ngohlobo oluphansi lwe-viscosity kanye nohlobo lwe-viscosity ephezulu.
I-methylcellulose ye-viscosity ephansi: Isisindo samangqamuzana sincane futhi i-viscosity yesisombululo iphansi. Ivame ukusetshenziselwa ukudla, imithi kanye nezimonyo, ikakhulukazi emulsification, ukumiswa kanye nokuqina. I-Low-viscosity methylcellulose ingagcina i-fluidity enhle nokufana, futhi ifanele izinhlelo zokusebenza ezidinga izixazululo ze-viscosity ephansi.
I-high-viscosity methylcellulose: Inesisindo esikhulu samangqamuzana futhi yakha isisombululo se-viscosity ephezulu ngemva kokuhlakazeka. Ivame ukusetshenziselwa izinto zokwakha, izintambo kanye nezinamathiselo zezimboni. I-high-viscosity methylcellulose ingakhuphula ngempumelelo amandla emishini, ukumelana nokugqoka nokunamathela kwesisombululo, ngakho-ke isetshenziswa kabanzi ezintweni ezidinga amandla aphezulu kanye nokumelana nokugqoka okuphezulu.
5. Ukuhlelwa ngokwezinga lokuguqulwa kwamakhemikhali
I-Methylcellulose iphuma ku-cellulose eguqulwe ngamakhemikhali. Ngokwendlela yokuguqula kanye nezinga, ingahlukaniswa ibe yi-methyl cellulose eyodwa kanye ne-cellulose ehlanganisiwe ehlanganisiwe.
I-Methyl cellulose eyodwa: ibhekisela kuma-cellulose ether ashintshwa kuphela nge-methyl. Lolu hlobo lomkhiqizo lunezakhiwo ezingokomzimba namakhemikhali ezizinzile, futhi izakhiwo zalo zokuncibilika, ukujiya kanye nokwenza ifilimu zihle kakhulu.
I-cellulose eguquliwe ehlanganisiwe: Ngaphezu kwe-methylation, iphinde ilashwe ngamakhemikhali, njenge-hydroxypropylation, i-ethylation, njll., ukwakha umkhiqizo oguquliwe oyinhlanganisela. Isibonelo, i-hydroxypropyl methylcellulose (HPMC) ne-carboxymethyl cellulose (CMC). Lawa ma-cellulose aguquliwe ahlanganisiwe ngokuvamile anokuncibilika okungcono kwamanzi, ukumelana nokushisa nokuzinza, futhi angakwazi ukuzivumelanisa nohlu olubanzi lwezidingo zezimboni.
6. Ukuhlukaniswa ngemboni yesicelo
Ukusetshenziswa okubanzi kwe-methylcellulose kuvumela ukuthi ihlukaniswe ngokwezimpawu zayo zokusetshenziswa ezimbonini ezahlukahlukene.
I-methylcellulose yemboni yezokwakha: Isetshenziswa kakhulu ezintweni ezisekelwe kusimende kanye ne-gypsum njengesigcini samanzi nesijiya. Ingathuthukisa ukusebenza kwezinto zokwakha, ivimbele ukulahleka kwamanzi kusenesikhathi, futhi ikhulise amandla emishini yemikhiqizo eqediwe.
I-methylcellulose yemboni yokudla: Njenge-emulsifier, i-thickener ne-stabilizer ekucubunguleni ukudla. Ingavimbela ukulahlekelwa kwamanzi, ithuthukise ukunambitheka kanye nesakhiwo sokudla, futhi yandise impilo yeshalofu yokudla.
I-methylcellulose yemboni yezemithi: Njengesibopho sethebhulethi noma into ekhishwa isikhathi eside yezidakamizwa. I-Methylcellulose ingasetshenziswa futhi ekulungiseni izidakamizwa zamathumbu njengesithwali sezidakamizwa esiphephile nesisebenzayo.
Imboni yezimonyo i-methylcellulose: Emikhiqizweni yokunakekelwa kwesikhumba nezimonyo, i-methylcellulose isetshenziswa njenge-thickener, emulsifier kanye ne-moisturizer ukusiza imikhiqizo yakhe ukuthungwa okuthambile nokushelelayo kuyilapho yandisa umphumela wokuswakama.
Kafushane, kunezindlela eziningi zokuhlukanisa i-methylcellulose, engahlukaniswa ngokuya nezici zayo zesakhiwo samakhemikhali, noma ngokuya ngezinkambu zayo zokusebenza kanye nezakhiwo zokuncibilika. Lezi zindlela ezihlukene zokuhlukanisa zisisiza ukuthi siqonde kangcono izici nemisebenzi ye-methylcellulose, futhi zinikeze isisekelo sethiyori sokusetshenziswa kwayo emikhakheni ehlukene.
Isikhathi sokuthumela: Oct-23-2024