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 kuzo zonke izinhlobo zopende lwe-latex futhi ayindlela eyinhloko yama-thickeners. Ama-thickeners e-cellulosic asebenza kahle kakhulu ezinhlelweni zamanzi ngoba aqina amanzi ngokwawo. Embonini yopende, 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 encibilikayo emanzini esetshenziswa kabanzi ekuqinisweni kwamapende e-latex akhiwe nge-matt kanye ne-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 nokungaguquguquki kwefilimu yokumboza zincike esisindweni sama-molecule esihlobene se-HEC. I-HEC kanye namanye ama-polymer angaxubene namanzi ancibilikayo aqinisa isigaba samanzi sokumboza. Ama-cellulose thickeners angasetshenziswa wodwa noma ahlanganiswe namanye ama-thickeners ukuthola i-rheology ekhethekile. Ama-cellulose ether angaba nesisindo sama-molecule esihlobene esihlukile kanye namazinga ahlukene e-viscosity, kusukela kusisombululo samanzi esiphansi se-molecule esingu-2% esine-viscosity esingaba ngu-10 MPS 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, kanye namazinga avame 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 ayo 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 okucheba futhi ngenxa yalokho 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 nokubopha i-pigment. 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 ukusebenza kwaso kufana nezinye izithako ezihlanganisayo, kodwa ngezinhlobo ezilula.
Isikhathi sokuthunyelwe: Mashi-16-2023