Umehluko phakathi kwe-Hydroxypropyl Methylcellulose ne-Hydroxyethyl Cellulose

I-Hydroxypropyl Methylcellulose (HPMC) futhiI-Hydroxyethyl Cellulose (HEC) kokubili kuyizinto ezisuselwa ku-cellulose, ezisetshenziswa kabanzi embonini, kwezokwelapha, ezimonyweni nakweminye imikhakha. Umehluko wazo oyinhloko ubonakala esakhiweni sama-molecule, izici zokuncibilika, amasimu okusetshenziswa nakwezinye izici.

1. Isakhiwo sama-molecule

I-Hydroxypropyl Methylcellulose (HPMC)

I-HPMC iyi-derivative encibilikayo emanzini eyethulwa ngokungenisa amaqembu e-methyl (-CH3) kanye ne-hydroxypropyl (-CH2CHOHCH3) kuchungechunge lwama-molecule e-cellulose. Ngokukhethekile, isakhiwo sama-molecule se-HPMC siqukethe izinto ezimbili ezisebenzayo, i-methyl (-OCH3) kanye ne-hydroxypropyl (-OCH2CH(OH)CH3). Ngokuvamile, isilinganiso sokungeniswa kwe-methyl siphezulu, kanti i-hydroxypropyl ingathuthukisa ngempumelelo ukuncibilika kwe-cellulose.

I-Hydroxyethyl Cellulose (HEC)

I-HEC iyi-derivative eyethulwa ngokungenisa amaqembu e-ethyl (-CH2CH2OH) kuchungechunge lwama-molecule e-cellulose. Esakhiweni se-hydroxyethyl cellulose, iqembu elilodwa noma ngaphezulu le-hydroxyl (-OH) le-cellulose lithathelwa indawo amaqembu e-ethyl hydroxyl (-CH2CH2OH). Ngokungafani ne-HPMC, isakhiwo sama-molecule se-HEC sinomunye kuphela othatha indawo ye-hydroxyethyl futhi asinawo amaqembu e-methyl.

2. Ukuncibilika kwamanzi

Ngenxa yokwehluka kwesakhiwo, ukuncibilika kwamanzi kwe-HPMC ne-HEC kuhlukile.

I-HPMC: I-HPMC inokuncibilika okuhle kwamanzi, ikakhulukazi kumanani e-pH angathathi hlangothi noma ane-alkaline kancane, ukuncibilika kwayo kungcono kune-HEC. Ukwethulwa kwamaqembu e-methyl kanye ne-hydroxypropyl kuthuthukisa ukuncibilika kwayo futhi kungandisa i-viscosity yayo ngokusebenzisana nama-molecule amanzi.

I-HEC: I-HEC ivame ukuncibilika emanzini, kodwa ukuncibilika kwayo kuphansi, ikakhulukazi emanzini abandayo, futhi ivame ukudinga ukuncibilika ngaphansi kwezimo zokushisa noma idinga amazinga aphezulu ukuze kufezwe imiphumela efanayo ye-viscosity. Ukuncibilika kwayo kuhlobene nomehluko wesakhiwo se-cellulose kanye ne-hydroxyethyl philicity yeqembu le-hydroxyethyl.

3. Izakhiwo ze-viscosity kanye ne-rheological

I-HPMC: Ngenxa yokuba khona kwamaqembu amabili ahlukene e-hydrophilic (i-methyl ne-hydroxypropyl) kuma-molecule ayo, i-HPMC inezakhiwo ezinhle zokulungisa i-viscosity emanzini futhi isetshenziswa kabanzi ezintweni zokunamathisela, ezimbozweni, ezinhlotsheni zokuhlanza, ezilungiselelweni zemithi nakwezinye izinkambu. Ngamazinga ahlukene, i-HPMC inganikeza ukulungiswa kusukela ku-viscosity ephansi kuya ku-viscosity ephezulu, futhi i-viscosity ibucayi kakhulu ekushintsheni kwe-pH.

I-HEC: I-viscosity ye-HEC ingalungiswa ngokushintsha ukuhlushwa, kodwa ububanzi bayo bokulungiswa kwe-viscosity buncane kune-HPMC. I-HEC isetshenziswa kakhulu ezimweni lapho kudingeka khona i-viscosity ephansi kuya kwephakathi, ikakhulukazi ekwakheni, ezinhlotsheni zokuhlanza kanye nemikhiqizo yokunakekela umuntu siqu. Izakhiwo ze-rheological ze-HEC zizinzile, ikakhulukazi ezindaweni ezine-acidic noma ezingathathi hlangothi, i-HEC inganikeza i-viscosity ezinzile kakhudlwana.

4. Izinkambu zohlelo lokusebenza

I-Hydroxypropyl methylcellulose (HPMC)

Imboni yokwakha: I-HPMC ivame ukusetshenziswa ku-samente mortar kanye ne-coating embonini yokwakha ukuthuthukisa ukugeleza, ukusebenza kahle kanye nokuvimbela imifantu.

Imboni Yezemithi: Njenge-ejenti yokulawula ukukhishwa kwemithi, i-HPMC isetshenziswa kabanzi embonini yezemithi. Ayikwazi ukusetshenziswa nje kuphela njenge-ejenti yokwakha amaphilisi nama-capsule, kodwa futhi njenge-glue ukusiza umuthi ukukhishwa ngokulinganayo.

Imboni yokudla: I-HPMC ivame ukusetshenziswa ekucubungulweni kokudla njengesiqinisi, isithambisi noma i-emulsifier ukuthuthukisa ukuthungwa nokunambitheka kokudla.

Imboni yezimonyo: Njengesithako sokujiya, i-HPMC isetshenziswa kabanzi emikhiqizweni efana nama-creams, ama-shampoo, nama-conditioner ukwandisa ukujiya kanye nokuqina kwemikhiqizo.

I-Hydroxyethyl cellulose (HEC)

Imboni yokwakha: I-HEC ivame ukusetshenziswa kusimende, i-gypsum, kanye nezinamathiselo zethayela ukuthuthukisa ukugeleza nesikhathi sokugcinwa komkhiqizo.

Abahlanzi: I-HEC ivame ukusetshenziswa kubahlanzi basekhaya, ezinhlotsheni zokuwasha izingubo kanye neminye imikhiqizo ukwandisa ukujiya komkhiqizo nokuthuthukisa umphumela wokuhlanza.

Imboni yezimonyo: I-HEC isetshenziswa kabanzi emikhiqizweni yokunakekelwa kwesikhumba, ama-shower gels, ama-shampoo, njll. njenge-ejenti yokujiya kanye neyokumisa ukuze kuthuthukiswe ukuthungwa kanye nokuqina komkhiqizo.

Ukukhishwa kwamafutha: I-HEC ingasetshenziswa futhi enkambisweni yokukhishwa kwamafutha njengesithako esijiyile emanzini oketshezi lokubhoboza ukuze kusizwe ukwandisa ukujiya koketshezi futhi kuthuthukiswe umphumela wokubhoboza.

5. Ukuqina kwe-pH

I-HPMC: I-HPMC ibucayi kakhulu ezinguqukweni ze-pH. Ngaphansi kwezimo ze-acidic, ukuncibilika kwe-HPMC kuyancipha, okungathinta ukusebenza kwayo. Ngakho-ke, ivame ukusetshenziswa endaweni engathathi hlangothi kuya endaweni ene-alkaline kancane.

I-HEC: I-HEC ihlala izinzile ngokwesilinganiso se-pH ebanzi. Iyakwazi ukuzivumelanisa nezimo ezi-acidic kanye ne-alkaline, ngakho-ke ivame ukusetshenziswa ekwakhiweni okudinga ukuzinza okuqinile.

I-HPMCfuthiI-HECziyahlukahluka ngesakhiwo sama-molecule, ukuncibilika, ukusebenza kokulungiswa kwe-viscosity, kanye nezindawo zokusetshenziswa. I-HPMC inokusebenza okuhle kokuncibilika kwamanzi kanye nokulungiswa kwe-viscosity, futhi ifaneleka ezinhlelweni zokusebenza ezidinga i-viscosity ephezulu noma ukusebenza okuthile okulawulwayo kokukhululwa; kuyilapho i-HEC inokuqina okuhle kwe-pH kanye nohlu olubanzi lwezicelo, futhi ifaneleka ngezikhathi ezidinga i-viscosity ephakathi nephansi kanye nokuzivumelanisa nezimo okuqinile kwemvelo. Ezinhlelweni zokusebenza zangempela, ukukhetha ukuthi yiziphi izinto okudingeka zihlolwe ngokusekelwe ezidingweni ezithile.