Uyini umehluko phakathi kwe-Hydroxyethyl cellulose (HEC) ne-Hydroxypropyl cellulose (HPC)?

IHydroxyethyl cellulose (HEC) kanye ne-hydroxypropyl cellulose (HPC) yizinto ezimbili eziphuma ku-cellulose ezisetshenziswa kabanzi emikhakheni eminingi yezimboni, njengemithi, izimonyo, ukudla, nezinto zokwakha. Nakuba izakhiwo zawo zamakhemikhali zifana futhi zakhiwa ngokwethula izinto ezihlukile kuma-molecule e-cellulose, anomehluko omkhulu ezakhini zamakhemikhali, izakhiwo ezibonakalayo, nezinkambu zokusetshenziswa.

1. Umehluko ekwakhekeni kwamakhemikhali

IHydroxyethyl cellulose (HEC) ikhiqizwa ngokwethula iqembu le-hydroxyethyl (-CH₂CH₂OH) eringini ye-glucose ye-molecule ye-cellulose. Ukwakheka kwayo kwamakhemikhali kuqukethe inani elikhulu lama-hydroxyethyl substituents, okwenza i-HEC ibe nezindawo ezinhle zokuncibilika kwamanzi kanye nokujiya.

I-Hydroxypropyl cellulose (HPC) yethula iqembu le-hydroxypropyl (-CH₂CHOHCH₃) ku-molecule ye-cellulose. Ngenxa yokuba khona kwaleli qembu le-hydroxypropyl, i-HPC ibonisa izici ezithile ezihlukile kune-HEC. Isibonelo, inezinga elithile le-hydrophobicity, elenza lincibilike kwezinye izincibilikisi eziphilayo, njenge-ethanol, i-isopropyl alcohol, njll.

2. Umehluko wokuncibilika

Esinye sezici eziyinhloko ze-HEC ukuncibilika kahle kwamanzi, ikakhulukazi emanzini abandayo. Ngenxa yokwethulwa kwamaqembu e-hydroxyethyl, i-HEC ingenza amabhondi e-hydrogen nama-molecule amanzi lapho ehlakazwa, ngaleyo ndlela ahlakazeke futhi ahlakazeke. Ngakho-ke, i-HEC inezinhlobonhlobo zezicelo ezinhlelweni ezisekelwe emanzini, njengezingubo ezisekelwe emanzini, ama-adhesives, ama-detergents, njll.

I-solubility ye-HPC iyinkimbinkimbi. I-solubility ye-HPC emanzini ithintwa kakhulu izinga lokushisa. Inoncibilika kahle emazingeni okushisa aphansi, kodwa i-gelation noma imvula ingase yenzeke emazingeni okushisa aphezulu. Ngasikhathi sinye, i-HPC iphinde ibe nokuncibilika kuzincibilikisi zemvelo (njenge-ethanol, i-isopropyl alcohol, njll.), okuyihlinzeka ngezinzuzo kwezinye izinhlelo zokusebenza ezikhethekile, njengokubunjwa okusekelwe ku-solvent kanye namalungiselelo athile okwelapha.

3. Umehluko kumphumela wokuqina kanye ne-rheology

I-HEC inekhono elihle lokuqina futhi ingakhuphula kakhulu i-viscosity yesisombululo kusixazululo esinamanzi, ngakho-ke ivame ukusetshenziswa njenge-thickener, stabilizer kanye ne-gelling agent. Umphumela wokuqina we-HEC uthintwa isisindo samangqamuzana kanye nezinga lokushintsha. Isisindo samangqamuzana sikhulu futhi izinga lokushintshwa liphakeme, i-viscosity enkulu yesisombululo. Ngesikhathi esifanayo, ukuziphatha kwe-rheological kwezixazululo ze-HEC kuyi-pseudoplastic, okungukuthi, njengoba izinga le-shear likhuphuka, i-viscosity yesisombululo iyancipha, esiza kakhulu ekubunjweni okudinga ukuzinza nokugeleza okuhle.

Umphumela wokuqina we-HPC ubuthakathaka, kodwa ngenxa yezimpawu zayo zesakhiwo samangqamuzana, izixazululo zayo zibonisa izici ezihlukahlukene ze-rheological. Izixazululo ze-HPC zivame ukuba nezakhiwo ze-Newtonian fluid, okungukuthi, i-viscosity yesisombululo izimele ngesilinganiso se-shear, esibaluleke kakhulu kwezinye izinhlelo zokusebenza ezidinga i-viscosity efanayo. Ngaphezu kwalokho, i-HPC iphinde ibe nezinto ezinhle zokwenza ifilimu, okwenza isetshenziswe kabanzi emikhakheni efana nemithi kanye nezingubo zokugqoka.

4. Ukuzinza nokumelana namakhemikhali

I-HEC ibonisa ukuzinza okuphezulu kwamakhemikhali ezinhlotsheni zenani le-pH ezihlukene futhi ngokuvamile ingasebenza ngokuzinza ebangeni le-pH lika-2 kuya ku-12. Ngakho-ke, i-HEC ifanelekele ukusetshenziswa ngaphansi kwezimo ezine-asidi ne-alkaline futhi isetshenziswa kakhulu ezintweni zokuhlanza, izimonyo nakweminye imikhakha.

Nakuba i-HPC inokuqina okuhle kwamakhemikhali, ukuzivumelanisa kwayo nenani le-pH kuncane kakhulu, futhi ngokuvamile ifanelekela izindawo ezingathathi hlangothi noma ezine-asidi ebuthaka. Kwezinye izimo lapho ukwakheka kwefilimu noma i-hydrophobicity kudingeka khona, i-HPC inganikeza ukusebenza okuhle kakhulu ngenxa yesakhiwo sayo esikhethekile, njengento ekhishwa isikhathi eside noma ingxenye yokuhlanganisa yezidakamizwa.

5. Umehluko emikhakheni yezicelo

Izinkambu zezicelo ze-HEC ikakhulukazi zifaka:

Izinto Zokwakha: Njenge-thickener ne-ejenti ye-gelling, i-HEC isetshenziswa kabanzi ezintweni ezisekelwe kusimende, izimbozo kanye nodaka lokwakha ukusiza ukuthuthukisa ukusebenza kokwakhiwa nokumelana namanzi.

I-Coatings kanye nopende: I-HEC isetshenziselwa ukunamathela emanzini ukuze kushube, kumiswe okwesikhashana, kuhlakazwe futhi kuzinze, ngaleyo ndlela kuthuthukiswe ukusebenza nokubukeka kwe-coating.

Imikhiqizo yamakhemikhali yansuku zonke: Emikhiqizweni yansuku zonke yamakhemikhali njengezihlanzi kanye nama-shampoos, i-HEC isebenza njenge-thickener ne-stabilizer, engathuthukisa ukuthungwa kanye nesipiliyoni sokusebenzisa umkhiqizo.

Izindawo ezisetshenziswa kakhulu ze-HPC zifaka:

Inkundla yezemithi: I-HPC ivamise ukusetshenziswa njengezinto zokumboza kanye namalungiselelo okukhishwa okuqhubekayo kwezidakamizwa ngenxa yezakhiwo zayo ezinhle kakhulu zokwenza ifilimu kanye nezakhiwo ezikhishwa ngaso sonke isikhathi. Ngaphezu kwalokho, futhi inezinhlelo zokusebenza ezibalulekile kuma-tablet binders.

Ukudla kanye nezimonyo: I-HPC isetshenziswa njenge-thiener kanye ne-emulsifier embonini yokudla, nanjenge-ejenti eyenza ifilimu kuzimonyo ukuze isize ukuthuthukisa ukuthungwa kanye nokudumba kwemikhiqizo.

Izigqoko Noyinki: Ngenxa yokuncibilika kwayo kanye nezakhiwo zefilimu, i-HPC ivame ukusetshenziswa ekuhlanganiseni nasekuhlanganiseni kukayinki okudinga izinyibilikisi zemvelo, ehlinzeka ngezingqimba zefilimu ezibushelelezi kanye nokugeleza okuhle.

6. Ukuvikelwa kwemvelo nokuphepha

Kokubili i-HEC ne-HPC zibhekwa njengezinto eziphephile zomzimba womuntu kanye nemvelo futhi zisetshenziswa kakhulu emikhiqizweni edinga ukuxhumana nomzimba womuntu, njengezimonyo nemithi. Kodwa-ke, i-HPC iyancibilika kwezinye izinyibilikisi zemvelo, ezingase zibe nezinselele ezithile ezinhlelweni zokusebenza ezinezidingo eziphakeme zemvelo, kuyilapho i-HEC isetshenziswa kakhulu ekubunjweni okuncibilika emanzini, ngakho-ke kulula ukuhlangabezana nezidingo zemvelo eziluhlaza.

I-Hydroxyethyl cellulose (HEC) kanye ne-hydroxypropyl cellulose (HPC), njengama-derivatives we-cellulose, banokufana kwesakhiwo samakhemikhali, ukuncibilika, umphumela wokuqina, izakhiwo ze-rheological, izinkambu zesicelo kanye nezakhiwo zokuvikela imvelo. Kunomehluko omkhulu ezicini. Ngenxa yezindawo zayo ezinhle kakhulu zokuncibilika kwamanzi kanye nokuqina, i-HEC isetshenziswa kabanzi ekwakhiweni okusekelwe emanzini, njengezingubo zokugqoka, izinto zokwakha kanye nemikhiqizo yamakhemikhali yansuku zonke. I-HPC inezinhlelo zokusebenza ezihlukile kwezemithi, ukudla kanye nezinye izinto zokumboza ezikhethekile ngenxa yokuncibilika kwayo, ukwakheka kwefilimu kanye nezakhiwo ezikhishwa ngaso sonke isikhathi. Ukukhetha ukuthi yikuphi okuphuma kokunye okuselulosini okufanele kusetshenziswe ngokuvamile kuncike ezidingweni ezithile zohlelo lokusebenza kanye nezidingo zokwakhiwa.