I-Carboxymethylcellulose (CMC) iyisengezo esisebenzayo esisetshenziswa kabanzi ezimbonini ezahlukahlukene njengokudla, ezemithi, ukwenza iphepha, izindwangu, nezimayini. Itholakala ku-cellulose yemvelo, egcwele izitshalo nezinye izinto eziphilayo. I-CMC iyi-polymer encibilika emanzini enezinto ezihlukile ezihlanganisa i-viscosity, i-hydration, i-adhesion kanye nokunamathela.
Izici ze-CMC
I-CMC iwukuphuma kwe-cellulose eshintshwa amakhemikhali ngokwethula amaqembu e-carboxymethyl esakhiweni sayo. Lokhu kuguqulwa kuthuthukisa ukuncibilika kanye ne-hydrophilicity ye-cellulose, ngaleyo ndlela kuthuthukise ukusebenza. Izakhiwo ze-CMC zincike ezingeni layo lokuthatha indawo (DS) nesisindo samangqamuzana (MW). I-DS ichazwa njengesilinganiso senani lamaqembu e-carboxymethyl ngeyunithi ngayinye ye-glucose kumgogodla we-cellulose, kuyilapho i-MW ikhombisa ubukhulu nokusabalalisa kwamaketanga e-polymer.
Enye yezinto ezibalulekile ze-CMC ukuncibilika kwayo emanzini. I-CMC incibilika kalula emanzini, yakha isixazululo se-viscous esinezici ze-pseudoplastic. Lokhu kuziphatha kwe-rheological kubangelwa ukusebenzisana kwe-intermolecular phakathi kwama-molecule e-CMC, okuholela ekwehleni kwe-viscosity ngaphansi kwengcindezi ye-shear. Imvelo ye-pseudoplastic yezixazululo ze-CMC izenza zifanelekele izinhlelo zokusebenza ezihlukahlukene ezifana nama-thickeners, stabilizers, nama-agent amisayo.
Esinye isici esibalulekile se-CMC yikhono layo lokwenza amafilimu. Izixazululo ze-CMC zingaphonswa kumafilimu anezakhiwo ezinhle kakhulu zemishini, izinto ezibonakalayo, kanye nokuguquguquka. Lawa mafilimu angasetshenziswa njengezingubo zokugqoka, ama-laminates kanye nezinto zokupakisha.
Ngaphezu kwalokho, i-CMC inezakhiwo ezinhle zokuhlanganisa nokuhlanganisa. Yakha isibopho esiqinile esinezindawo ezihlukene, okuhlanganisa ukhuni, insimbi, ipulasitiki nendwangu. Le ndawo iholele ekusetshenzisweni kwe-CMC ekukhiqizeni ama-coatings, ama-adhesives kanye noyinki.
I-viscosity ye-CMC
I-viscosity yezixazululo ze-CMC incike ezintweni ezimbalwa njengokugxilisa ingqondo, i-DS, MW, izinga lokushisa, ne-pH. Ngokuvamile, izixazululo ze-CMC zibonisa ama-viscosity aphezulu ezindaweni eziphezulu, i-DS, ne-MW. I-viscosity nayo iyanda ngokuncipha kwezinga lokushisa kanye ne-pH.
I-viscosity yezixazululo ze-CMC ilawulwa ukuxhumana phakathi kwamaketanga e-polymer nama-molecule e-solvent esixazululweni. Ama-molecule e-CMC asebenzisana nama-molecule wamanzi ngamabhondi e-hydrogen, akhe igobolondo le-hydration elizungeze amaketanga e-polymer. Leligobolondo le-hydration linciphisa ukuhamba kwamaketanga e-polymer, ngaleyo ndlela likhulise i-viscosity yesisombululo.
Ukuziphatha kwe-rheological yezixazululo ze-CMC kubonakala ngamajika okugeleza, achaza ubudlelwano phakathi kokucindezeleka kokugunda kanye nesilinganiso sokugunda kwesixazululo. Izixazululo ze-CMC zibonisa ukuziphatha kokugeleza okungekona okwaseNewtonian, okusho ukuthi i-viscosity yazo iyashintsha ngesilinganiso sokugunda. Ngamazinga aphansi e-shear, i-viscosity yezixazululo ze-CMC iphakeme, kuyilapho kumazinga aphezulu okugunda, i-viscosity iyancipha. Lokhu kuziphatha kokugunda kwe-shear kungenxa yamaketanga e-polymer aqondana futhi anwebeka ngaphansi kwengcindezi yokugunda, okuholela ekunciphiseni kwamandla e-intermolecular phakathi kwamaketanga kanye nokuncipha kwe-viscosity.
Ukusetshenziswa kwe-CMC
I-CMC isetshenziswa kabanzi emikhakheni ehlukene ngenxa yezakhiwo zayo ezihlukile nokuziphatha kwe-rheological. Embonini yokudla, i-CMC isetshenziswa njenge-thickener, stabilizer, emulsifier kanye nesithuthukisi sokuthungwa. Yengezwa ekudleni okufana no-ayisikhilimu, iziphuzo, amasoso kanye nezinto ezibhakiwe ukuze kuthuthukiswe ukuthungwa kwazo, ukungaguquguquki nempilo yeshelufu. I-CMC iphinde ivimbele ukwakheka kwamakristalu eqhwa ekudleni okuqandisiwe, okuholela kumkhiqizo obushelelezi, okhilimu.
Embonini yezemithi, i-CMC isetshenziswa njenge-binder, disintegrant kanye ne-ejenti yokukhululwa elawulwayo ekwakhiweni kwethebhulethi. Thuthukisa ukucindezelwa kanye ne-fluidity ye-powder futhi uqinisekise ukufana nokuzinza kwamaphilisi. Ngenxa yezakhiwo zayo zokunamathisela i-mucoadhesive kanye ne-bioadhesive, i-CMC iphinde isetshenziswe njenge-excipient ekwakhiweni kwamehlo, amakhala, kanye nomlomo.
Embonini yamaphepha, i-CMC isetshenziswa njengesithasiselo sokuphela esimanzi, i-coating binder kanye ne-ejenti yokucindezela usayizi. Ithuthukisa ukugcinwa kwe-pulp kanye nokukhipha amanzi, ikhuphule amandla ephepha kanye nokuminyana, futhi inikeza indawo ebushelelezi futhi ecwebezelayo. I-CMC futhi isebenza njengesithiyo samanzi namafutha, ivimbela uyinki noma olunye uketshezi ekungeneni ephepheni.
Embonini yendwangu, i-CMC isetshenziswa njenge-ejenti yokulinganisa, i-printing thickener, kanye nensiza yokudaya. Ithuthukisa i-fiber adhesion, ithuthukisa ukungena kombala kanye nokulungisa, futhi inciphisa ukungqubuzana nemibimbi. I-CMC iphinde inikeze ukuthamba nokuqina kwendwangu, kuye ngokuthi i-DS kanye ne-MW ye-polymer.
Embonini yezimayini, i-CMC isetshenziswa njenge-flocculant, inhibitor kanye ne-rheology modifier ekusetshenzisweni kwezimbiwa. Ithuthukisa ukuhlaliswa kanye nokuhlunga kwezinto eziqinile, inciphisa ukuhlukana ne-ganggue yamalahle, futhi ilawula i-viscosity yokumiswa nokuzinza. I-CMC futhi yehlisa umthelela wemvelo wenqubo yezimayini ngokunciphisa ukusetshenziswa kwamakhemikhali anobuthi namanzi.
Ekuphetheni
I-CMC iyisengezo esisebenza ngezindlela eziningi nesibalulekile esibonisa izakhiwo eziyingqayizivele kanye ne-viscosity ngenxa yesakhiwo sayo samakhemikhali nokusebenzisana namanzi. Ukuncibilika kwayo, amandla okwenza ifilimu, izakhiwo zokubopha kanye nokunamathela kuyenza ifaneleke ukusetshenziswa okuhlukene emkhakheni wokudla, owemithi, wephepha, wezindwangu kanye nezimayini. I-viscosity yezixazululo ze-CMC ingalawulwa yizinto ezimbalwa, njengokugxilisa ingqondo, i-DS, i-MW, izinga lokushisa, ne-pH, futhi ingabonakala ngokuziphatha kwayo kwe-pseudoplastic kanye nokunciphisa i-shear-thinning. I-CMC inomthelela omuhle kwikhwalithi, ukusebenza kahle kanye nokusimama kwemikhiqizo nezinqubo, okuyenza ibe yingxenye ebalulekile yemboni yesimanje.
Isikhathi sokuthumela: Sep-25-2023