Embonini yezokwakha, i-HPMC ivamise ukufakwa emanzini angathathi hlangothi, futhi umkhiqizo we-HPMC uhlakazwa wodwa ukuze wahlulele izinga lokuchithwa.
Ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo ogoqa ngokushesha ngaphandle kokuhlakazeka uwumkhiqizo ngaphandle kokuphathwa kwendawo; ngemva kokufakwa emanzini angathathi hlangothi wodwa, umkhiqizo ongahlakazeka futhi ungahlangani uwumkhiqizo onokwelashwa okungaphezulu.
Lapho umkhiqizo we-HPMC ongalashiwe uncibilika wodwa, inhlayiya yawo eyodwa incibilika ngokushesha futhi yakhe ifilimu ngokushesha, okwenza kungenzeki ukuthi amanzi angene kwezinye izinhlayiya, okuholela ekuhlanganiseni nasekuhlanganiseni. Kubizwa ngokuthi umkhiqizo osheshayo emakethe njengamanje. Izici ze-HPMC engelashiwe yilezi: izinhlayiya ngazinye zincibilika ngokushesha kakhulu ezimweni ezingathathi hlangothi, ezine-alkaline, ne-asidi, kodwa azikwazi ukuhlakaza phakathi kwezinhlayiya oketshezini, okuholela ekuhlanganiseni nasekuhlanganeni. Ekusebenzeni kwangempela, ngemva kokuhlakazeka ngokomzimba kwalolu chungechunge lwemikhiqizo kanye nezinhlayiya eziqinile ezifana nempuphu yerabha, usimende, isihlabathi, njll., izinga lokuhlakazeka liyashesha kakhulu, futhi akukho ukuhlanganisa noma ukuhlanganisa. Uma kudingekile ukuhlakaza imikhiqizo ye-HPMC ngokwehlukana, lolu chungechunge lwemikhiqizo kufanele lusetshenziswe ngokuqapha, ngoba luzohlanganisa futhi lufake izigaxa. Uma kudingekile ukuhlakaza umkhiqizo we-HPMC ongaphenduliwe ngokuhlukana, udinga ukuhlakazwa ngokufanayo ngamanzi ashisayo angu-95°C, bese upholiswa ukuze uncibilike.
Izinhlayiya zomkhiqizo we-HPMC eziphathwe ngobuso, emanzini angathathi hlangothi, izinhlayiya ngazinye zingahlakazwa ngaphandle kwe-agglomeration, kodwa ngeke zikhiqize ngokushesha i-viscosity. Ngemuva kokucwiliswa isikhathi esithile, ukwakheka kwamakhemikhali okwelashwa okungaphezulu kuyabhujiswa, futhi amanzi angancibilikisa izinhlayiya ze-HPMC. Ngalesi sikhathi, izinhlayiya zomkhiqizo ziye zahlakazeka ngokugcwele futhi amuncwa amanzi anele, ngakho umkhiqizo ngeke agglomerate noma agglomerate ngemva kokuhlakazeka. Isivinini sokuhlakazeka nesivinini sokuhlakazeka sincike ezingeni lokwelashwa kwendawo. Uma ukwelashwa kwendawo kukuncane, isivinini sokuhlakazeka sihamba kancane futhi isivinini sokunamathela siyashesha; kuyilapho umkhiqizo onokwelashwa kwendawo ejulile unejubane lokuhlakazeka okusheshayo kanye nesivinini sokunamathela esinensayo. Uma ufuna ukwenza lolu chungechunge lwemikhiqizo luhlakazeke ngokushesha kulesi simo, ungakwazi ukulahla inani elincane lezinto ezine-alkali uma zihlakazeka zodwa. Imakethe yamanje ngokuvamile ibizwa ngokuthi imikhiqizo encibilika kancane. Izici zemikhiqizo ye-HPMC ephathwe phezulu yilezi: kusisombululo esinamanzi, izinhlayiya zingahlakazeka zodwa, zingancibilika ngokushesha kusimo se-alkaline, futhi zincibilike kancane esimweni sokungathathi hlangothi nesimuncu.
Ekukhiqizeni kwangempela, lolu chungechunge lwemikhiqizo luvame ukuncibilika ngemva kokuhlakazwa nezinye izinto zezinhlayiya eziqinile ngaphansi kwezimo ze-alkaline, futhi izinga lokuchithwa kwalo alihlukile kunelemikhiqizo engelashiwe. Ibuye ifanele ukusetshenziswa emikhiqizweni echithwa yodwa, ngaphandle kwe-caking noma izigaxa. Imodeli ethile yomkhiqizo ingakhethwa ngokuvumelana nezinga lokuqedwa elidingwa ukwakhiwa.
Ngesikhathi senqubo yokwakha, kungakhathaliseki ukuthi udaka lukasimende noma i-slurry esekelwe ku-gypsum, iningi lazo liyizinhlelo ze-alkaline, futhi inani le-HPMC elingeziwe lincane kakhulu, elingahlakazwa ngokulinganayo phakathi kwalezi zinhlayiya. Lapho amanzi engezwa, i-HPMC izoncibilika ngokushesha. I-hydroxypropyl methylcellulose yangempela kuphela engamelana nokuhlolwa kwezinkathi ezine zonyaka: inqubo yokusabela ilawulwa ngokunembile ukukhiqiza i-HPMC, futhi ukushintshwa kwayo kuqedile futhi ukufana kuhle kakhulu. Isixazululo saso esinamanzi sicacile futhi sisobala, sinemicu embalwa yamahhala. Ukuhambisana ne-rubber powder, usimende, i-lime nezinye izinto eziyinhloko kunamandla ikakhulukazi, okungenza izinto eziyinhloko zidlale ukusebenza kahle kakhulu. Kodwa-ke, i-HPMC enokusabela okungekuhle inemicu eminingi yamahhala, ukusatshalaliswa okungalingani kwezinto ezibambile, ukugcinwa kwamanzi okungekuhle kanye nezinye izakhiwo, okuholela emazingeni amaningi okuhwamuka lapho izinga lokushisa liphezulu. Kodwa-ke, okubizwa ngokuthi i-HPMC enenani elikhulu lezithasiselo kunzima ukuxhumanisa nomunye nomunye, ngakho-ke ukusebenza kokugcinwa kwamanzi kubi nakakhulu. Uma kusetshenziswa i-HPMC yezinga eliphansi, izinkinga ezifana namandla aphansi e-slurry, isikhathi esifushane sokuvula, impushana, ukuqhekeka, ukugoba nokuchithwa kuzobangelwa, okuzokwandisa ubunzima bokwakha futhi kunciphise kakhulu izinga lesakhiwo. Okufanayo yi-cellulose ether, ingaba nemiphumela ehluke ngokuphelele.
Isikhathi sokuthumela: Mar-29-2023