I-HPMC (i-hydroxypropyl methylcellulose) yinto yepolymer enyibilikayo emanzini esetyenziswa kakhulu kwicandelo lokwakha, amayeza, ukutya kunye neekhemikhali zemihla ngemihla. Inokujiya okuhle, i-emulsification, i-film-forming, i-colloid ekhuselayo kunye nezinye iimpawu. Kwiinkqubo ze-emulsion, i-HPMC inokulawula i-viscosity ye-emulsion ngeendlela ezahlukeneyo.
1. Ulwakhiwo lweemolekyuli ze-HPMC
Ubunzima be-HPMC buchaphazeleka kakhulu bubunzima bayo beemolekyuli kunye nenqanaba lokutshintshwa. Okukhona ubunzima bemolekyuli bukhulu, kokukhona ubuninzi be-viscosity yesisombululo buphezulu; kwaye inqanaba lokutshintshwa (oko kukuthi, inqanaba lokutshintshwa kwe-hydroxypropyl kunye namaqela e-methoxy) lichaphazela ukunyibilika kunye neepropati ze-viscosity ze-HPMC. Ngokukodwa, inqanaba lokutshintshwa liphezulu, kokukhona ukunyibilika kwamanzi kwe-HPMC kuphucuka, kwaye ubuninzi be-viscosity buyanda ngokufanelekileyo. Abavelisi badla ngokubonelela ngeemveliso ze-HPMC ezinobunzima beemolekyuli ezahlukeneyo kunye namanqanaba okutshintshwa ukuhlangabezana neemfuno zezicelo ezahlukeneyo.
2. Sebenzisa ukugxila
Uxinzelelo lwe-HPMC kwisisombululo samanzi yenye yezinto eziphambili ezichaphazela i-viscosity. Ngokubanzi, xa uxinzelelo lwe-HPMC luphezulu, kokukhona i-viscosity yesisombululo ikhula kakhulu. Nangona kunjalo, i-viscosity yeentlobo ezahlukeneyo ze-HPMC kuxinzelelo olufanayo inokwahluka kakhulu. Ke ngoko, kwizicelo ezisebenzayo, kuyimfuneko ukukhetha uxinzelelo olufanelekileyo lwesisombululo se-HPMC ngokweemfuno ezithile ze-viscosity. Umzekelo, kwizicelo zokwakha, uxinzelelo lwe-HPMC luhlala lulawulwa phakathi kwe-0.1% kunye ne-1% ukubonelela nge-viscosity yokusebenza efanelekileyo kunye nokusebenza kokwakha.
3. Indlela yokunyibilikisa
Inkqubo yokunyibilika kwe-HPMC nayo inempembelelo ebalulekileyo kwi-viscosity yokugqibela. I-HPMC kulula ukuyisasaza emanzini abandayo, kodwa izinga lokunyibilika licotha; iyanyibilika ngokukhawuleza emanzini ashushu, kodwa kulula ukuyihlanganisa. Ukuze kuthintelwe ukuhlangana, indlela yokongeza kancinci kancinci ingasetyenziswa, oko kukuthi, kuqala yongeza i-HPMC kancinci kancinci emanzini abandayo ukuze isasazeke, emva koko uyifudumale kwaye uyixube ide inyibilike ngokupheleleyo. Ukongeza, i-HPMC ingaxutywa kwangaphambili nezinye iipowder ezomileyo ize yongezwe emanzini ukuze inyibilike ukuphucula ukusebenza kakuhle kokunyibilika kunye nokuzinza kwe-viscosity.
4. Ubushushu
Ubushushu bunempembelelo ebalulekileyo kwi-viscosity yezisombululo ze-HPMC. Ngokubanzi, i-viscosity yesisombululo se-HPMC iyancipha njengoko ubushushu busanda. Oku kungenxa yokuba ukunyuka kobushushu kuya kwenza buthathaka ukubopha kwe-hydrogen phakathi kwee-molecules, okwenza i-HPMC molecular chain ityibilike lula, ngaloo ndlela inciphise i-viscosity yesisombululo. Ke ngoko, kwizicelo ezifuna i-viscosity ephezulu, izisombululo ze-HPMC zihlala zisetyenziswa kubushushu obuphantsi. Umzekelo, kwizicelo zamayeza, izisombululo ze-HPMC zihlala zisetyenziswa kubushushu begumbi ukuqinisekisa uzinzo nokusebenza kakuhle kweyeza.
5. Ixabiso le-pH
I-viscosity yesisombululo se-HPMC nayo ichaphazeleka lixabiso le-pH. I-HPMC ine-viscosity ephezulu phantsi kweemeko ezingathathi cala nezibuthathaka ze-asidi, ngelixa i-viscosity iya kuncipha kakhulu phantsi kweemeko ezinamandla ze-asidi okanye ze-alkaline. Oku kungenxa yokuba amaxabiso e-pH agqithisileyo aya kutshabalalisa isakhiwo se-molecular se-HPMC kwaye anciphise isiphumo sayo sokutyeba. Ke ngoko, kwizicelo ezisebenzayo, ixabiso le-pH yesisombululo kufuneka lilawulwe kwaye ligcinwe ngaphakathi koluhlu oluzinzileyo lwe-HPMC (ngesiqhelo i-pH 3-11) ukuqinisekisa isiphumo sayo sokutyeba. Umzekelo, kwizicelo zokutya, i-HPMC idla ngokusetyenziswa ekutyeni okune-asidi njengeyogathi kunye nejusi, kwaye i-viscosity efanelekileyo inokufumaneka ngokulungisa ixabiso le-pH.
6. Ezinye izongezo
Kwiinkqubo ze-emulsion, i-viscosity ye-HPMC ingalungiswa ngokongeza ezinye izinyibilikisi okanye izinyibilikisi. Umzekelo, ukongeza ubungakanani obufanelekileyo beetyuwa ezingaphiliyo (ezifana ne-sodium chloride) kunokunyusa i-viscosity yesisombululo se-HPMC; ngelixa ukongeza izinyibilikisi ze-organic ezifana ne-ethanol kunokunciphisa i-viscosity yayo. Ukongeza, xa isetyenziswa kunye nezinye izinyibilikisi (ezifana ne-xanthan gum, i-carbomer, njl.njl.), i-viscosity kunye nokuzinza kwe-emulsion nako kunokuphuculwa kakhulu. Ke ngoko, kuyilo lwefomula yokwenyani, izongezo ezifanelekileyo zinokukhethwa njengoko kufuneka ukuze kuphuculwe i-viscosity kunye nokusebenza kwe-emulsion.
I-HPMC inokulawula ngokuchanekileyo i-emulsion viscosity ngokusebenzisa isakhiwo sayo se-molecular, uxinaniso lokusetyenziswa, indlela yokunyibilika, ubushushu, ixabiso le-pH kunye nezongezo. Kwizicelo ezisebenzayo, ezi zinto kufuneka ziqwalaselwe ngokupheleleyo ukuze kukhethwe uhlobo olufanelekileyo lwe-HPMC kunye neemeko zokusetyenziswa ukuze kufezekiswe isiphumo esifanelekileyo sokutyeba. Ngokusebenzisa uyilo lwefomyula yesayensi kunye nolawulo lwenkqubo, i-HPMC inokudlala indima ebalulekileyo kwicandelo lokwakha, amayeza, ukutya kunye neekhemikhali zemihla ngemihla, ibonelela ngokusebenza okugqwesileyo kunye namava omsebenzisi.
Ixesha leposi: Julayi-17-2024