Umphumela wokujiya wei-cellulose etherkuncike ku: izinga lokupholimetha kwe-cellulose ether, ukuhlushwa kwesisombululo, izinga lokucheba, izinga lokushisa kanye nezinye izimo. Impahla ye-gelling yesisombululo ihlukile ku-alkyl cellulose kanye ne-derivatives yayo eguquliwe. Izakhiwo ze-gelation zihlobene nezinga lokushintsha, ukuhlushwa kwesisombululo kanye nezithasiselo. Kuma-derivatives aguquliwe e-hydroxyalkyl, izakhiwo ze-gel zihlobene nezinga lokuguqulwa kwe-hydroxyalkyl. Kuma-MC ne-HPMC aguquliwe aphansi, isixazululo esingu-10%-15% singalungiswa, i-MC ne-HPMC aphakathi nendawo zingalungiswa isixazululo esingu-5%-10%, kanti i-MC ne-HPMC ephezulu kakhulu zingalungiselela isixazululo esingu-2%-3% kuphela, futhi ngokuvamile ukuhlukaniswa kwe-viscosity kwe-cellulose ether nakho kufakwa ngesisombululo esingu-1%-2%.
I-cellulose ether enesisindo sama-molecule aphezulu inokusebenza kahle kokujiya okuphezulu, kanti ama-polymer anesisindo sama-molecule ahlukene anokuqina okuhlukile esixazululweni esifanayo sokujiya. I-viscosity eqondiwe ingatholakala kuphela ngokungeza inani elikhulu le-cellulose ether enesisindo sama-molecule aphansi. I-viscosity yayo ayincikile kakhulu esilinganisweni sokucheba, futhi i-viscosity ephezulu ifinyelela i-viscosity eqondiwe, edinga ukwengeza okuncane, futhi i-viscosity incike ekusebenzeni kahle kokujiya. Ngakho-ke, ukuze kufezwe ukuvumelana okuthile, inani elithile le-cellulose ether (ukujiya kwesisombululo) kanye ne-viscosity yesisombululo kumele kuqinisekiswe. Izinga lokushisa le-gel lesisombululo nalo liyehla ngokuhambisana nokwanda kokujiya kwesisombululo, kanye nama-gel ekushiseni kwegumbi ngemva kokufinyelela ukujiya okuthile. I-gelling concentration ye-HPMC iphakeme kakhulu ekushiseni kwegumbi.
Ukuvumelana kungalungiswa futhi ngokukhetha usayizi wezinhlayiya nokukhetha ama-cellulose ethers anamazinga ahlukene okuguqulwa. Lokhu okubizwa ngokuthi ukuguqulwa ukwethula izinga elithile lokushintshana kwamaqembu e-hydroxyalkyl esakhiweni samathambo se-MC. Ngokushintsha amanani okushintshana ahlobene ama-substituents amabili, okungukuthi, amanani okushintshana ahlobene e-DS kanye ne-MS amaqembu e-methoxy kanye ne-hydroxyalkyl esivame ukuwasho. Izidingo zokusebenza ezahlukahlukene ze-cellulose ether zingatholakala ngokushintsha amanani okushintshana ahlobene ama-substituents amabili.
Isixazululo samanzi se-cellulose ether esine-viscosity ephezulu sine-thixotropy ephezulu, okuyisici esiyinhloko se-cellulose ether. Izixazululo zamanzi zama-polymer e-MC zivame ukuba ne-pseudoplastic kanye ne-non-thixotropic fluidity ngaphansi kokushisa kwejeli yazo, kodwa izakhiwo zokugeleza kwe-Newtonian ngamanani aphansi okushefa. I-pseudoplasticity iyanda ngesisindo sama-molecule noma ukuhlushwa kwe-cellulose ether, kungakhathaliseki uhlobo lwe-substituent kanye nezinga lokushintsha. Ngakho-ke, ama-cellulose ethers ebanga elifanayo le-viscosity, kungakhathaliseki ukuthi i-MC, i-HPMC, i-HEMC, azohlala ebonisa izakhiwo ezifanayo ze-rheological inqobo nje uma ukuhlushwa kanye nokushisa kugcinwa kungaguquguquki. Ama-gel esakhiwo akhiwa lapho izinga lokushisa liphakanyiswa, futhi kwenzeka ukugeleza kwe-thixotropic ephezulu. Ama-cellulose ethers ane-viscosity ephezulu kanye ne-viscosity ephansi abonisa i-thixotropy ngisho nangaphansi kokushisa kwejeli. Le mpahla inenzuzo enkulu ekulungisweni kokuleveli nokugoba ekwakhiweni kwe-mortar yokwakha.
Kudingeka kuchazwe lapha ukuthi lapho i-viscosity iphakama khonai-cellulose ether, lapho ukugcinwa kwamanzi kuba ngcono, kodwa lapho i-viscosity iphakama, kulapho isisindo sama-molecule se-cellulose ether siphakama khona, kanye nokwehla okuhambisanayo kokuncibilika kwayo, okunomthelela omubi ekugxilweni kwe-mortar kanye nokusebenza kokwakhiwa. Lapho i-viscosity iphakama, kulapho umphumela wokujiya ubonakala khona ku-mortar, kodwa awulingani ngokuphelele. I-viscosity ethile ephakathi nephansi, kodwa i-cellulose ether eguquliwe isebenza kangcono ekuthuthukiseni amandla esakhiwo se-mortar emanzi. Ngokukhula kwe-viscosity, ukugcinwa kwamanzi kwe-cellulose ether kuyathuthuka.
Isikhathi sokuthunyelwe: Ephreli-28-2024