I-Cellulose iyi-polysaccharide eyakha izinhlobo ezahlukene zama-ether ancibilikayo emanzini. Ama-cellulose thickeners angama-polymer ancibilikayo emanzini angewona ama-ionic. Umlando wokusetshenziswa kwawo mude kakhulu, ungaphezu kweminyaka engama-30, futhi kunezinhlobo eziningi. Asetshenziswa cishe kuwo wonke amapende e-latex futhi ayizinto ezisetshenziswa kakhulu kuma-thickeners. Ama-thickeners e-cellulosic asebenza kahle kakhulu ezinhlelweni zamanzi ngoba aqinisa amanzi ngokwawo. Embonini yokupenda, ama-thickeners e-cellulose asetshenziswa kakhulu yile:i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-ethyl hydroxyethyl cellulose (EHEC), i-hydroxypropyl cellulose (HPC),i-hydroxypropyl methyl cellulose (HPMC)kanye ne-hydroxyethyl cellulose eguquliwe ngamanzi (HMHEC). I-HEC iyi-polysaccharide encibilika emanzini esetshenziswa kabanzi ekuqineni kopende be-latex bezakhiwo obu-matt kanye no-semi-gloss. Ama-thickeners atholakala ngama-viscosity grade ahlukene futhi ama-thickeners anale cellulose anokuhambisana okuhle kakhulu kombala kanye nokuqina kokugcina.
Izakhiwo zokulinganisa, zokulwa nokuqhekeka, ukwakha ifilimu kanye nokulwa nokuwa kwefilimu yokumboza zincike esisindweni sama-molecule esihlobeneI-HEC. I-HEC kanye namanye ama-polymer angaxubeki namanzi ancibilikayo angazinzisa isigaba samanzi sesembozo. Ama-thickeners e-cellulose angasetshenziswa wodwa noma ahlanganiswe namanye ama-thickeners ukuthola i-rheology ekhethekile. Ama-ether e-cellulose angaba nesisindo sama-molecule esihlukile kanye namazinga ahlukene e-viscosity, kusukela kusisombululo samanzi esiphansi se-molecule esingu-2% esine-viscosity esingaba ngu-10 mP s kuya ku-viscosity ephezulu ye-molecule yesisindo esingu-100 000 mP s. Amabanga aphansi esisindo sama-molecule avame ukusetshenziswa njenge-colloids evikelayo ku-polymerization ye-latex paint emulsion, futhi amazinga asetshenziswa kakhulu (i-viscosity 4 800–50 000 mP·s) asetshenziswa njenge-thickeners. Indlela yokusebenza yalolu hlobo lwe-thickener ibangelwa ukumuncwa okuphezulu kwezibopho ze-hydrogen kanye nokubanjwa phakathi kwamaketanga ama-molecule.
I-cellulose yendabuko iyi-polymer enesisindo esikhulu sama-molecule eqina kakhulu ngokubanjwa phakathi kwamaketanga ama-molecule. Ngenxa ye-viscosity ephezulu ngesivinini esiphansi sokushefa, isici sokulengisa sibi, futhi sithinta ukukhanya kwefilimu yokumboza. Ngesivinini esiphezulu sokushefa, i-viscosity iphansi, ukumelana kokuchaphaza kwefilimu yokumboza kubi, futhi ukugcwala kwefilimu yokumboza akukuhle. Izici zokusetshenziswa kwe-HEC, njengokumelana nebhulashi, ukuqopha kanye nokuchitheka kwe-roller, kuhlobene ngqo nokukhetha i-thickener. Futhi izakhiwo zayo zokugeleza ezifana nokumelana nokulengisa kanye nokusa zithinteka kakhulu yi-thickeners.
I-cellulose eguquliwe nge-hydrophobically (HMHEC) iyi-cellulose thickener enokuguqulwa kwe-hydrophobic kwamanye amaketanga ahlanganisiwe (amaqembu amaningana e-alkyl e-long-chain afakwa eceleni kweketanga eliyinhloko lesakhiwo). Lesi simbozo sinobuthi obuphezulu ngamazinga aphezulu okushefa ngakho-ke ukwakheka kwefilimu okungcono. Njenge-Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Umphumela wayo wokujiya ufana nowe-cellulose ether thickeners enesisindo esikhulu kakhulu sama-molecule. Ithuthukisa ubuthi kanye nokulinganisa kwe-ICI, futhi inciphisa ukucindezeleka kobuso. Isibonelo, ukucindezeleka kobuso be-HEC cishe kungama-67 mN/m, kanti ukucindezeleka kobuso be-HMHEC kungu-55~65 mN/m.
I-HMHEC inamandla amahle kakhulu okufafaza, ukulwa nokuwa, izakhiwo zokulinganisa, ukukhanya okuhle kanye nokuvikela umbala. Isetshenziswa kabanzi futhi ayinawo umthelela omubi ekwakhekeni kwefilimu yamapende e-latex amancane anosayizi wezinhlayiya ezincane. Ukusebenza okuhle kokwakha ifilimu kanye nokusebenza kokulwa nokugqwala. Lesi sithako esihlanganisayo sisebenza kangcono nezinhlelo ze-vinyl acetate copolymer futhi sinezakhiwo ezifana nezinye izithako ezihlanganisayo, kodwa ngezakhiwo ezilula.
Isikhathi sokuthunyelwe: Ephreli-25-2024