IHydroxypropyl methylcellulose (HPMC) iyi-ether engancibilikiliswa ngamanzi engeyona ionic cellulose esetshenziswa kakhulu ezintweni zokwakha, emithini yemithi, ekudleni, emikhiqizweni yokunakekelwa komuntu siqu nasezimbotsheni. Emigqumeni yezimboni nopende, i-HPMC isibe isithasiselo esibalulekile ngenxa yezakhiwo zayo ezihlukile zomzimba namakhemikhali. Umsebenzi wayo oyinhloko ukusebenza njenge-thickener, stabilizer, i-ejenti eyenza ifilimu kanye ne-ejenti yokulawula i-rheology ukuze kuthuthukiswe ukusebenza, ukuzinza kwesitoreji kanye nekhwalithi yokugqoka yezingubo namapende.
1. Izici eziyisisekelo ze-HPMC
I-HPMC iyinhlanganisela etholwe ngokushintsha amakhemikhali i-cellulose yemvelo. Inezici ezilandelayo ezibalulekile zomzimba namakhemikhali, okuyenza isetshenziswe kabanzi embotsheni yezimboni nopende:
Ukunyibilika kwamanzi: I-HPMC inokuncibilika okuhle emanzini abandayo, yakha isisombululo se-viscous esisobala esiza ukuthuthukisa i-viscosity kapende.
I-Thermal gelbility: Ezingeni lokushisa elithile, i-HPMC izokwakha ijeli futhi ibuyele esimweni sesixazululo ngemva kokupholisa. Lesi sici sivumela ukuthi inikeze ukusebenza okungcono kokugqoka ngaphansi kwezimo ezithile zokwakha.
Izakhiwo ezinhle zokwenza ifilimu: I-HPMC ingenza ifilimu eqhubekayo lapho upende loma, ithuthukise ukunamathela nokuqina kwento enamathelayo.
Ukuzinza: Inokumelana okuphezulu nama-acids, izisekelo kanye nama-electrolyte, okuqinisekisa ukuzinza kwe-coating ngaphansi kwezimo ezihlukene zokugcinwa nokusetshenziswa.
2. Imisebenzi esemqoka ye-HPMC enamathela ezimbonini namapende
2.1 I-Thickener
Ezimbotsheni zezimboni, umphumela wokujiya we-HPMC ubaluleke kakhulu. Isixazululo saso sine-viscosity ephezulu kanye nezakhiwo ezinhle zokunciphisa i-shear, okungukuthi, ngesikhathi sokugqugquzela noma ukudweba, i-viscosity izokwehla okwesikhashana, ngaleyo ndlela kube lula ukwakhiwa kopende, futhi i-viscosity izolulama ngokushesha ngemva kokumiswa kokwakhiwa ukuvimbela upende. kusuka ekuwohlokeni. Lesi sakhiwo siqinisekisa ngisho nokufaka isicelo futhi kunciphisa ukuwohloka.
2.2 Ukulawulwa kwe-Rheology
I-HPMC inomthelela omkhulu ku-rheology yezingubo zokugqoka. Igcina i-viscosity efanele yezingubo ngesikhathi sokugcina futhi ivimbele ukumboza ukuthi kungadideki noma kulungiswe. Ngesikhathi sokufaka isicelo, i-HPMC ihlinzeka ngezakhiwo ezifanele zokulinganisa ukuze isize upende usabalalise ngokulinganayo endaweni yesicelo futhi yakhe ukunamathela okubushelelezi. Ukwengeza, izakhiwo zayo zokunciphisa i-shear zinganciphisa izimpawu zebhulashi noma ama-roll marks akhiqizwa phakathi nenqubo yokufaka isicelo futhi athuthukise ikhwalithi yokubukeka kwefilimu yokugcina yokugqoka.
2.3 I-ejenti eyenza amafilimu
Izici zokwenza ifilimu ze-HPMC zisiza ukuthuthukisa ukunamathela namandla efilimu enamathela. Ngesikhathi senqubo yokomisa, ifilimu eyakhiwe yi-HPMC inokuqina okuhle nokunwebeka, okungathuthukisa ukumelana nokuqhekeka kanye nokumelana nokugqoka kwe-coating, ikakhulukazi kwezinye izinhlelo zokusebenza ezifunwa kakhulu zezimboni, njengemikhumbi, izimoto, njll., I-HPMC The izakhiwo zokwakha ifilimu zingathuthukisa ngokuphumelelayo ukuqina kwe-coating.
2.4 Isiqinisi
Njengesiqinisi, i-HPMC ingavimbela ukuduma kwezingulube, izigcwalisi nezinye izinhlayiya eziqinile ekwakhiweni kwe-coating, ngaleyo ndlela ithuthukise ukuzinza kwesitoreji sezingubo. Lokhu kubaluleke kakhulu kuma-coatings asekelwe emanzini. I-HPMC ingavimbela ukuhlukaniswa noma ukuhlanganisana kwezingubo ngesikhathi sokulondoloza futhi iqinisekise ukuhambisana kwekhwalithi yomkhiqizo esikhathini eside sokulondoloza.
3. Ukusetshenziswa kwe-HPMC ezinhlobonhlobo ezahlukene
3.1 Izembatho ezisekelwe emanzini
Izindwangu ezisekelwe emanzini zithole ukunakwa okukhulu eminyakeni yamuva nje ngenxa yobungane bazo bemvelo kanye nokukhishwa kwe-volatile organic compound (VOC) ephansi. I-HPMC isetshenziswa kakhulu kuma-coatings asekelwe emanzini. Njenge-thickener ne-stabilizer, i-HPMC ingathuthukisa ngempumelelo ukuqina kwesitoreji nokusebenza kwezingubo ezisekelwe emanzini. Inikeza ukulawulwa kokugeleza okuhle kakhulu ezindaweni zokushisa eziphansi noma eziphakeme, okwenza upende lushelele lapho ufuthwa, uxutshwa noma ugoqwa.
3.2 Upende we-latex
Ipende ye-latex ingenye yezingubo zokwakha ezisetshenziswa kakhulu namuhla. I-HPMC isetshenziswa njenge-ejenti yokulawula i-rheology kanye ne-thickener kupende we-latex, ongalungisa i-viscosity kapende we-latex, uthuthukise ukusabalala kwawo, futhi uvimbele ifilimu kapende ekuwohlokeni. Ukwengeza, i-HPMC inomphumela ongcono wokulawula ekusatshalalisweni kopende we-latex futhi ivimbela izingxenye zikapende ukuthi zingazinzisi noma zihlune ngesikhathi sokulondoloza.
3.3 Upende owenziwe ngamafutha
Nakuba ukusetshenziswa kwezithako ezisekelwe kuwoyela kwehlile namuhla ngezidingo eziqinile zokuvikela imvelo, zisasetshenziswa kabanzi kwezinye izimboni ezithile, njengezingubo zokuvikela zensimbi. I-HPMC isebenza njenge-ejenti elengayo kanye ne-ejenti yokulawula i-rheology ezimbotsheni ezisekelwe kuwoyela ukuze kuvinjelwe ukuhlala kwe-pigment futhi kusize ukunamathela ukuthi kube nokulingana okungcono nokunamathela ngesikhathi sokufaka isicelo.
4. Isetshenziswa kanjani kanye nomthamo we-HPMC
Inani le-HPMC elisetshenziswa kuma-coatings ngokuvamile linqunywa uhlobo lwe-coating nezidingo ezithile zohlelo lokusebenza. Ngokuvamile, inani elingeziwe le-HPMC livamise ukulawulwa phakathi kuka-0.1% no-0.5% wesamba esiphelele sokumbozwa. Indlela yokwengeza ngokuvamile ihlanganisa impushana eyomile eqondile noma isixazululo esilungiselelwe kusengaphambili bese seyengezwa. Umphumela wokulungiswa kwe-solubility kanye ne-viscosity we-HPMC uthintwa izinga lokushisa, ikhwalithi yamanzi kanye nezimo ezinyakazayo. Ngakho-ke, indlela yokusetshenziswa idinga ukulungiswa ngokuvumelana nezimo zangempela zenqubo.
I-Hydroxypropyl methylcellulose (HPMC) isetshenziswa njenge-thickener, i-ejenti yokulawula i-rheology, i-ejenti eyenza ifilimu kanye ne-stabilizer ekugqokeni kwezimboni namapende, ukuthuthukisa kakhulu ukusebenza kokwakhiwa, ukuzinza kwesitoreji kanye nefilimu yokugcina yokugqoka yokugqoka. izinga. Ngokugqugquzelwa kwezingubo ezihambisana nemvelo kanye nesidingo esikhulayo semakethe sezingubo ezisebenza kahle kakhulu, i-HPMC izoqhubeka nokubamba iqhaza elibalulekile ekuhlanganiseni kwezimboni esikhathini esizayo. Ngokusetshenziswa okunengqondo kwe-HPMC, izakhiwo ezingokomzimba namakhemikhali zokumboza zingathuthukiswa ngempumelelo, futhi ukuqina nomphumela wokuhlobisa we-coating ungathuthukiswa.
Isikhathi sokuthumela: Sep-13-2024