Abstract:
Eminyakeni yamuva nje, izimbotshana ezisekelwe emanzini zithole ukunakwa okusabalele ngenxa yobungane bazo bemvelo kanye nokuqukethwe okuphansi kwe-volatile organic compound (VOC). IHydroxyethylcellulose (HEC) iyi-polymer encibilika emanzini esetshenziswa kabanzi kulezi zakhiwo, esebenza njenge-thickener yokwandisa i-viscosity nokulawula i-rheology.
ethula:
1.1 Isendlalelo:
Izembatho ezisekelwe emanzini seziphenduke enye indlela evumelana nemvelo kunezinye zendabuko ezisekelwe ku-solvent, ixazulula izinkinga ezihlobene nokukhishwa kwe-organic compound eguquguqukayo kanye nomthelela wemvelo. I-Hydroxyethylcellulose (HEC) iphuma ku-cellulose eyisithako esiyinhloko ekwakhiweni kwezingubo ezisekelwe emanzini futhi inikeza ukulawula nokuzinza kwe-rheology.
1.2 Izinjongo:
Lesi sihloko sihlose ukucacisa izici zokuncibilika kwe-HEC emigqonyeni esekwe emanzini futhi ifunde umthelela wezici ezihlukahlukene ku-viscosity yayo. Ukuqonda lezi zici kubalulekile ekuthuthukiseni ukwakheka kokunamathela kanye nokufeza ukusebenza okufunayo.
I-Hydroxyethylcellulose (HEC):
2.1 Isakhiwo nokusebenza:
I-HEC iphuma ku-cellulose etholakala ngokusabela kwe-etherification ye-cellulose ne-ethylene oxide. Ukwethulwa kwamaqembu e-hydroxyethyl kumgogodla we-cellulose kunomthelela ekuncibilikeni kwawo kwamanzi futhi kuwenza i-polymer ebalulekile ezinhlelweni ezisekelwe emanzini. Isakhiwo samangqamuzana kanye nezakhiwo ze-HEC kuzoxoxwa ngakho ngokuningiliziwe.
Ukuncibilika kwe-HEC emanzini:
3.1 Izinto ezithinta ukunyibilika:
I-solubility ye-HEC emanzini ithintwa izici eziningana, okuhlanganisa izinga lokushisa, i-pH, nokugxila. Lezi zici kanye nomthelela wazo ekuncibilikeni kwe-HEC kuzoxoxwa ngakho, kunikeze ukuqonda ngezimo ezivumela ukuchithwa kwe-HEC.
3.2 Umkhawulo wokuncibilika:
Ukuqonda imikhawulo ye-solubility ephezulu nephansi ye-HEC emanzini kubalulekile ekwakheni ama-coatings ngokusebenza kahle. Lesi sigaba sizocubungula ibanga lokugxila lapho i-HEC ikhombisa ukuncibilika okuphezulu kanye nemiphumela yokweqa le mikhawulo.
Thuthukisa i-viscosity nge-HEC:
4.1 Iqhaza le-HEC ku-viscosity:
I-HEC isetshenziswa njenge-thickener emigqeni esekelwe emanzini ukusiza ukwandisa i-viscosity nokuthuthukisa ukuziphatha kwe-rheological. Izinqubo lapho i-HEC ifinyelela khona ukulawulwa kwe-viscosity izocutshungulwa, igcizelele ukusebenzisana kwayo nama-molecule wamanzi nezinye izithako ekwakhiweni kwe-coating.
4.2 Umthelela wefomula eguquguqukayo ku-viscosity:
Ukuguquguquka okuhlukahlukene kokubunjwa, okuhlanganisa ukugxila kwe-HEC, izinga lokushisa, nezinga le-shear, kungathinta kakhulu i-viscosity yezingubo eziphuma emanzini. Lesi sigaba sizohlaziya umthelela walokhu okuguquguqukayo ku-viscosity ye-HEC-containing coatings ukuze kuhlinzekwe ngemininingwane esebenzayo kubadidiyeli.
Izicelo namathemba esikhathi esizayo:
5.1 Izicelo zezimboni:
I-HEC isetshenziswa kabanzi ezinhlelweni ezahlukahlukene zezimboni ezinjengamapende, izinto zokunamathisela nama-sealants. Lesi sigaba sizogqamisa iminikelo ethile ye-HEC ekuhlanganisweni kwamanzi kulezi zinhlelo zokusebenza futhi sixoxe ngezinzuzo zayo ngaphezu kokunye ukujiya.
5.2 Izikhombisi-ndlela zocwaningo lwangomuso:
Njengoba isidingo sokunamathela esimeme nesisebenza kahle sikhula, izikhombisi-ndlela zocwaningo lwesikhathi esizayo emkhakheni wokwakheka okusekelwe ku-HEC zizocutshungulwa. Lokhu kungase kuhlanganise izinto ezintsha ekuguqulweni kwe-HEC, amasu okuqamba amanoveli, nezindlela zokulinganisa ezithuthukisiwe.
Ekuphetheni:
Ukufingqa okutholakele okuyinhloko, lesi sigaba sizogqamisa ukubaluleka kokulawulwa kwe-solubility kanye ne-viscosity ezimbotsheni zamanzi kusetshenziswa i-HEC. Lesi sihloko sizophetha ngemithelela esebenzayo kubaqulunqi nezincomo zocwaningo olwengeziwe ukuze kuthuthukiswe ukuqonda kwe-HEC kumasistimu ahamba emanzini.
Isikhathi sokuthumela: Dec-05-2023