Ukukhiqiza i-hydroxypropyllylyllose (HPMC) kubandakanya izinyathelo ezimbalwa eziyinkimbinkimbi eziguqula iselula ibe yi-polymer eguquguqukayo ngezinhlobonhlobo zezicelo ezingxenyeni ezahlukahlukene. Le nqubo ngokuvamile iqala ngokukhishwa kwe-cellulose emithonjeni esekwe kwizitshalo, kulandelwa ukuguqulwa kwamakhemikhali ukwethula i-hydroxypropyl no-methyls kanye namaqembu we-methyl ku-cellulose backbone. I-HPMC polymer ephumayo inikezela ngezakhiwo ezihlukile njengokuqina, ukubopha, ukushaya ifilimu, nokugcinwa kwamanzi. Masinikeze inqubo enemininingwane yokukhiqizwa kwe-HPMC.
1. Ukuthola izinto ezivuthiwe:
Izinto ezingavuthiwe eziluhlaza zokukhiqizwa kwe-HPMC ziyi-cellulose, ethathwe kwimithombo esekwe kwizitshalo ezinjenge-solip pulp, amabutho ekotini, noma ezinye izitshalo ezingcolile. Le mithombo ikhethwe ngokususelwa ezintweni ezinjengobumsulwa, okuqukethwe kwe-cellulose, kanye nokusimama.
2. Ukukhishwa kweselula:
I-cellulose ikhishwe kwimithombo esekwe ezitshalweni ekhethiwe ngochungechunge lwezinqubo ezisebenza ngemishini kanye namakhemikhali. Ekuqaleni, impahla eluhlaza ithola ukwenziwa sengathi, okungabandakanya ukugeza, ukugaya, nokusoma ukususa ukungcola kanye nomswakama. Ngemuva kwalokho, i-cellulose ithathwa ngamakhemikhali afana nama-alkalis noma ama-acid ukuze aphule i-lignin ne-hemicellulose, eshiya ngemuva kwemicu ye-cellulose.
3. Ukuthethelela:
I-Eletherafication yinqubo ebalulekile yamakhemikhali ekukhiqizweni kwe-HPMC, lapho ama-hydroxypropyl kanye namaqembu we-methyl angeniswa emhlane we-cellulose. Lesi sinyathelo sibalulekile ekuguquleni izakhiwo ze-cellulose ukufezekisa ukusebenza okufunayo kwe-HPMC. I-ehelifish ijwayele ukwenziwa ngokusabela kwe-cellulose ene-propelene oxide (yamaqembu we-hydroxypropy) kanye ne-methyl chloride (amaqembu we-methyl (amaqembu we-methyl) ebukhoneni buka-Alkali Catrilysts ngaphansi kwezimo zokushisa kanye nengcindezi.
4. Ukungathathi hlangothi nokugeza:
Ngemuva kokusheshisa, inhlanganisela yokuphendula ayithathi hlangothi ukuze ususe noma yimaphi ama-alkali asele ama-catalysts futhi alungise izinga le-PH. Lokhu kuvame ukwenziwa ngokungeza i-acid noma isisekelo ngokuya ngemibandela ethile yokuphendula. Ukungathathi hlangothi kulandelwa ukugeza okuphelele ukuze ususe imikhiqizo, amakhemikhali angavuliwe, nokungcola okuvela kumkhiqizo we-HPMC.
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Isixazululo se-HPMC esingathathi hlangothi futhi sageza saqhubeka nokuhluza ukuhlukanisa izinhlayiya eziqinile futhi sifinyelele isixazululo esicacile. Ukuhlunga kungafaka izindlela ezahlukahlukene ezifana nokuhlunga kwe-vacuum noma i-centrifugation. Lapho isixazululo sesicacisiwe, somiswa ukususa amanzi futhi sithole i-HPMC ngefomu le-powder. Izindlela zokomisa zingafaka ukomiswa kwesifutho, ukomisa umbhede ofihlekile, noma ukomisa isigubhu, ngokuya ngosayizi wezinhlayiya eziyizinhlayiyana nezici zomkhiqizo wokugcina.
6. Ukugaya nokufikelwa (kuyakhetheka):
Kwezinye izimo, i-HPMC eyomile ye-HPMC ingahle icubungulwe futhi njengokugaya nokuvinjwa ukufeza osayizi abathile bezinhlayiya futhi bathuthukise ukugeleza okuthile. Lesi sinyathelo sisiza ukuthola i-HPMC enezimpawu zomzimba ezingaguquki ezifanele izinhlelo ezahlukahlukene.
7. Ukulawulwa kwekhwalithi:
Kuyo yonke inqubo yokukhiqiza, izindlela zokulawula ezisezingeni eliphakeme ziyenziwa ukuqinisekisa ubumsulwa, ukungaguquguquki, kanye nokwenza umkhiqizo we-HPMC. Amapharamitha wokulawula asezingeni eliphakeme angafaka ukubonakala, ukusatshalaliswa kosayizi wezinhlayiyana, okuqukethwe umswakama, izinga lokufaka esikhundleni (DS), nezinye izakhiwo ezifanele. Amasu wokuhlaziya afana nezilinganiso zokubonana, i-spectroscopy, i-chromatoscopy, i-chromatography, futhi microscopy ivame ukusetshenziswa ukuhlolwa kwekhwalithi.
8. Ukupakishwa nokugcinwa:
Lapho umkhiqizo we-HPMC udlula izivivinyo zokulawula ezisezingeni elifanele, uhlanganiswe ezitsheni ezifanele ezifana nezikhwama noma izigubhu futhi zibhalwe ngokuya ngezincazelo. Ukupakishwa okufanele kusiza ukuvikela i-HPMC kusuka kumswakama, ukungcoliswa, kanye nomonakalo womzimba ngesikhathi sokugcina nokuhamba. I-HPMC ehlanganisiwe igcinwa kwizimo ezilawulwayo ukuze ilondoloze ukuqina kwayo kanye neshalofly-impilo kuze kube yilapho isilungele ukusatshalaliswa nokusetshenziswa.
Izicelo ze-HPMC:
I-Hydroxypropyll Methylcellulose ithola ukusetshenziswa okubanzi kwezimboni ezahlukahlukene kufaka phakathi amakhemikhali, ukwakhiwa, ukudla, izimonyo, nemikhiqizo yokunakekelwa komuntu. Emikhakheni, isetshenziswa njenge-binder, ukuqhekeka, ifilimu yangaphambili, ne-ejenti yokukhishwa kwethebhulethi. Ezokwakhiwa, i-HPMC iqashwa njenge-Swerener, i-ejenti yokugcina amanzi, kanye nokushintshwa kwe-Rheology ku-Cement-based Mastrars, Plasters, kanye nama-tile anamathela. Ekudleni, isebenza njengesikhulu, i-stabilizer, kanye ne-emulsifier emikhiqizweni efana nososo, amasobho kanye nama-dessert. Ngokwengeziwe, i-HPMC isetshenziswa kwizimonyo kanye nemikhiqizo yokunakekelwa komuntu siqu yokuthola izakhiwo zayo zokwakha amafilimu, ama-moisturizing, kanye nokushintsha kwezakhiwo.
Ukucatshangelwa Kwezemvelo:
Ukukhiqizwa kwe-HPMC, njengezinqubo eziningi zezimboni, kuba nemithelela yemvelo. Kwenziwa imizamo yokuthuthukisa ukuqina kokukhiqizwa kwe-HPMC ngezinhlelo ezifana nokusebenzisa imithombo yamandla evuselelekayo, ukunciphisa ukusetshenziswa kwemfucuza, ukunciphisa ukukhiqizwa kwemfucuza, kanye nokusebenzisa ubuchwepheshe bokukhiqiza abanobungani. Ngokwengeziwe, ukuthuthukiswa kwe-HPMC esekelwe kwi-BIO ethathwe emithonjeni eqhubekayo efana ne-algae noma ukuvutshelwa kwe-microbial kukhombisa ukunciphisa ukwehlisa izinyawo zemvelo zokukhiqizwa kwe-HPMC.
Ukukhiqizwa kwe-hydroxypropylllylyll methylcellulose kufaka uchungechunge lwezinyathelo eziqala kusuka ekukhishweni kweselula ekuguqulweni kwamakhemikhali, ukuhlanzwa, kanye nokulawulwa kwekhwalithi. I-HPMC polymer ephumayo inikezela ngohlobo oluthile lokusebenza futhi ithola izinhlelo zokusebenza ezihlukene izimboni. Imizamo yokuma kokuqina kanye nokuzibophezela kwezemvelo ukushayela okusha ekukhiqizeni kwe-HPMC, okuhlose ukunciphisa umthelela wayo emvelweni ngenkathi uhlangabezana nesidingo esikhulayo sala ma-polymer ahlukahlukene.
Isikhathi sePosi: Mar-05-2024