Ukuqina komphumela we-hydroxypropyl methylcellulose

IHydroxypropyl methylcellulose inika udaka olumanzi nge-viscosity enhle kakhulu, engakhuphula kakhulu amandla okubopha phakathi kodaka olumanzi kanye nongqimba oluyisisekelo, futhi ithuthukise ukusebenza kodaka lokulwa nokusa.Isetshenziswa kabanzi ekwenzeni udaka, isistimu yokufaka udonga lwangaphandle kanye nokubopha ngezitini odakeni.Ukuqina komphumela we-cellulose ether nakho kungakhuphula i-homogeneity kanye nekhono lokulwa nokuhlakazeka kwezinto ezisanda kuxutshwa usimende, kuvimbele ukubola, ukuhlukaniswa kanye nokopha kodaka nokhonkolo, futhi kungasetshenziswa kukhonkolo yefayibha, ukhonkolo ongaphansi kwamanzi kanye nokhonkolo ozihlanganisayo. .

I-Hydroxypropyl methylcelluloseI-HPMCkwandisa i-viscosity yezinto ezisekelwe kusimende kusukela ku-viscosity yesisombululo se-cellulose ether.Inkomba ye-"viscosity" ivame ukusetshenziselwa ukuhlola i-viscosity yesisombululo se-cellulose ether.I-viscosity ye-cellulose ether ngokuvamile ibhekisela kusixazululo se-cellulose ether esinokugxila okuthile (okufana no-2%).Isivinini (noma izinga lokuzungezisa, elifana no-20 rpm), inani le-viscosity elilinganiswa ngethuluzi lokulinganisa elicacisiwe (elifana ne-viscometer ejikelezayo).

I-Viscosity iyipharamitha ebalulekile yokuhlola ukusebenza kwe-cellulose ether.Ukuphakama kwe-viscosity yesisombululo se-hydroxypropyl methylcellulose, kuba ngcono i-viscosity yezinto ezisekelwe kusimende, kuba ngcono ukunamathela ku-substrate, futhi kuba ngcono amandla okulwa nokusatshalaliswa nokulwa nokuhlakazeka.Iqinile, kodwa uma i-viscosity yayo inkulu kakhulu, izophazamisa uketshezi nokusebenza kwezinto ezisekelwe kusimende (njengokunamathisela ummese wokuplasta ngesikhathi sokwakha udaka).Ngakho-ke, i-viscosity ye-cellulose ether esetshenziswa odakeni oluxutshwe okomile ngokuvamile i-15,000 ~ 60,000 mPa.I-S-1, i-self-leveling mortar kanye nokhonkolo ozihlanganisayo, okudinga uketshezi oluningi, kudinga i-viscosity ephansi ye-cellulose ether.

Ukwengeza, umphumela wokujiya we-hydroxypropyl methylcellulose uzokwandisa isidingo samanzi sezinto ezisekelwe kusimende, ngaleyo ndlela kwandise isivuno sodaka.

I-viscosity yezixazululo ze-hydroxypropyl methylcellulose incike kulezi zici ezilandelayo:

Isisindo samangqamuzana (noma idigri ye-polymerization) kanye nokuhlushwa kwe-cellulose ether, izinga lokushisa lesixazululo, izinga le-shear kanye nendlela yokuhlola.

1. Izinga eliphakeme le-polymerization ye-cellulose ether kanye nesisindo se-molecular sikhulu, ukuphakama kwe-viscosity yesisombululo sayo esinamanzi;

2. Uma uphakeme umthamo (noma ukugxila) kwe-cellulose ether, kulapho i-viscosity yesisombululo sayo esinamanzi iphezulu, kodwa kufanele kuthathwe ukunakekelwa ukuze kukhethwe umthamo ofanele uma uyisebenzisa, ukuze ungaphazamisi ukusebenza kodaka nokhonkolo uma umthamo uphezulu kakhulu;

3. Njengoketshezi oluningi, i-viscosity yesisombululo se-cellulose ether izokwehla ngokunyuka kwezinga lokushisa, futhi ukuphakama kwe-cellulose ether, ithonya elikhulu lokushisa;

4. Isixazululo se-cellulose ether ngokuvamile siyi-pseudoplastic, enendawo yokunciphisa i-shear.Uma sikhulu izinga lokugunda ngesikhathi sokuhlolwa, i-viscosity iyancipha.

Ngakho-ke, ukuhlangana kodaka kuzoncishiswa ngenxa yamandla angaphandle, okuzuzisa ukwakhiwa kodaka, ukuze udaka lube nokusebenza okuhle nokuhlangana ngesikhathi esifanayo.Kodwa-ke, isixazululo se-cellulose ether sizobonisa izici ze-Newtonian fluid lapho ukugxila kuphansi kakhulu futhi i-viscosity incane.Lapho ukugxila kukhula, isixazululo sizobonisa kancane kancane izici ze-pseudoplastic fluid, futhi lapho ukugxila kuphezulu, kusobala kakhulu i-pseudoplasticity.