Kokubili i-hydroxypropyl methylcellulose ne-hydroxyethyl cellulose yi-cellulose

I-Hydroxypropyl methylcellulose (HPMC)kanye ne-hydroxyethyl cellulose (HEC) yizinto ezimbili ezibalulekile eziphuma ku-cellulose ezisetshenziswa kabanzi ezimbonini ezihlukahlukene ngenxa yezakhiwo zazo eziyingqayizivele. Ngenkathi zombili zitholakala ku-cellulose, zinezakhiwo zamakhemikhali ezihlukile futhi zibonisa izici ezihlukene kanye nokusebenza.

1. Isingeniso Sokuphuma Kweselulosi:
I-Cellulose iyi-polysaccharide yemvelo etholakala ezindongeni zamaseli ezitshalo, ehlanganisa amaketango aqondile amayunithi e-glucose axhunywe ngamabhondi e-β(1→4) e-glycosidic. Okuphuma ku-cellulose kutholwa ngokushintsha amakhemikhali i-cellulose ukuze kuthuthukiswe izakhiwo ezithile noma ukwethula imisebenzi emisha. I-HPMC kanye ne-HEC yizinto ezimbili eziphuma kulezo ezisetshenziswa kakhulu ezimbonini kusukela kwezokuthaka imithi kuye kwezokwakha.

2. Ukuhlanganisa:
I-HPMC ihlanganiswa ngokuphendula i-cellulose nge-propylene oxide ukuze yethule amaqembu e-hydroxypropyl bese kamuva i-methyl chloride yethule amaqembu e-methyl. Lokhu kubangela ukufakwa esikhundleni kwamaqembu e-hydroxyl ochungechungeni lwe-cellulose, okukhiqiza umkhiqizo onokuncibilika okuthuthukisiwe kanye nezakhiwo zefilimu.

I-HEC, ngakolunye uhlangothi, ikhiqizwa ngokusabela kwe-cellulose nge-ethylene oxide ukuze ihlanganise amaqembu e-hydroxyethyl. I-degree of substitution (DS) kukho kokubili i-HPMC ne-HEC ingalawulwa ngokulungisa izimo zokusabela, okuthinta izakhiwo zazo ezifana ne-viscosity, ukunyibilika, nokuziphatha kwe-gelation.

3. Isakhiwo Samakhemikhali:
I-HPMC ne-HEC ziyahlukahluka ngezinhlobo zamaqembu abambele anamathiselwe kumgogodla we-cellulose. I-HPMC iqukethe kokubili i-hydroxypropyl namaqembu e-methyl, kuyilapho i-HEC iqukethe amaqembu e-hydroxyethyl. Lawa ma-substitute anikeza izici ezihlukile kokunye okuphuma kokunye, okuthonya ukuziphatha kwawo ezinhlelweni zokusebenza ezihlukahlukene.

4. Izakhiwo Zomzimba:
Kokubili i-HPMC kanye ne-HEC ama-polymers ancibilika emanzini anezindawo ezinhle kakhulu zokujiya. Kodwa-ke, bakhombisa umehluko ku-viscosity, umthamo we-hydration, nekhono lokwenza ifilimu. I-HPMC ivamise ukuba ne-viscosity ephezulu uma iqhathaniswa ne-HEC ekugxilweni okulinganayo, okuyenza ifanelekele izinhlelo zokusebenza ezidinga ukujiya okukhulu.

Ukwengeza, i-HPMC yakha amafilimu acacile nahlangene kakhudlwana ngenxa yezinto ezifakwe esikhundleni se-methyl, kuyilapho i-HEC yakha amafilimu athambile navumelana nezimo. Lo mehluko ezimpahleni zefilimu wenza okuphuma ngakunye kulungele ukusetshenziswa kwemithi, emikhiqizweni yokunakekelwa komuntu siqu, kanye nezimboni zokudla.

5. Izicelo:
5.1 Imboni Yezemithi:
Kokubili i-HPMC kanye ne-HEC asetshenziswa kakhulu ekwenziweni kwemithi njengama-binder, ama-thickeners, nama-ejenti ahlanganisa ifilimu. Bathuthukisa ubuqotho bethebhulethi, balawule ukukhululwa kwezidakamizwa, futhi bathuthukise umuzwa womlomo ekwakhiweni koketshezi. I-HPMC ikhethwa ekwenziweni kokukhishwa okuqhubekayo ngenxa yezinga layo lokudonsa amanzi kancane, kuyilapho i-HEC ivame ukusetshenziswa ezixazululweni zamehlo namakhilimu asezindaweni ngenxa yokucaca kwayo nokuhambisana noketshezi lwebhayoloji.

5.2 Imboni Yezokwakha:
Embonini yezokwakha,I-HPMCfuthiI-HECasetshenziswa njengezithasiselo ezintweni ezisekelwe kusimende, njengama-mortars, ama-grouts, nama-renders. Athuthukisa ukusebenza, ukugcinwa kwamanzi, nokunamathela, okuholela ekusebenzeni okuthuthukisiwe nokuqina komkhiqizo wokugcina. I-HPMC ivamise ukuncamela umthamo wayo ophezulu wokugcina amanzi, okunciphisa ukuqhekeka futhi kuthuthukise isikhathi sokusetha.

5.3 Imikhiqizo Yokunakekela Umuntu:
Kokubili okuphuma kokunye kuthola izinhlelo zokusebenza emikhiqizweni yokunakekela yomuntu siqu njengama-shampoos, okokugcoba, nokhilimu njengama-ejenti ajiyayo, ama-emulsifiers, neziqinisi. I-HEC idlulisela ukuthungwa okubushelelezi nokucwebezelayo ekwakhiweni, okuyenza ifanelekele imikhiqizo yokunakekelwa kwezinwele nokhilimu besikhumba. I-HPMC, enezici zayo ezinhle kakhulu zokwenza ifilimu, isetshenziswa ekukhiqizweni kwelanga nasezintweni zezimonyo ezidinga ukumelana namanzi nokugqokwa okuhlala isikhathi eside.

5.4 Imboni Yokudla:
Embonini yokudla, i-HPMC kanye ne-HEC isebenza njengama-ejenti okuqina, iziqinisi, kanye nama-texturizers emikhiqizweni eyahlukene okuhlanganisa amasoso, okokugqoka, nama-dessert. Bathuthukisa i-mouthfeel, bavimbele i-syneresis, futhi bathuthukise izimfanelo zezinzwa zokwakhiwa kokudla. I-HPMC ivame ukuthandwa ngenxa yokucaca kwayo nokuzinza kokushisa, okuyenza ifanelekele izinhlelo zokusebenza ezidinga ama-gel obala nama-emulsions azinzile.

6. Isiphetho:
I-hydroxypropyl methylcellulose (HPMC) kanye ne-hydroxyethyl cellulose (HEC) yizinto eziphuma ku-cellulose ezinezakhiwo zamakhemikhali ezihlukile, izakhiwo, kanye nezicelo. Ngenkathi zombili zinikeza izakhiwo ezinhle kakhulu zokujiya nokwenza ifilimu, zibonisa umehluko ku-viscosity, ukucaca kwefilimu, nokuziphatha kwe-hydration. Ukuqonda lo mehluko kubalulekile ekukhetheni okuphuma kokunye okulungile kwezinhlelo zokusebenza ezithize kuzo zonke izimboni ezifana nezamakhemisi, ezokwakha, ukunakekelwa komuntu siqu, nokudla. Njengoba ucwaningo luqhubeka nokuthuthuka, kulindelwe izinguquko ezengeziwe kanye nokusetshenziswa kokuphuma kokuphuma kwe-cellulose, okunomthelela ekuqhubekeni kokubaluleka kwazo emikhakheni eyahlukene yezimboni.