IHydroxypropyl cellulose (HPC) iyi-polymer evame ukusetshenziswa ezimbonini ezahlukahlukene, kufaka phakathi ezemithi, izimonyo, nokudla. Njengama-polymers amaningi, ukuzinza kwawo okushisayo kanye nezinga lokushisa lokuwohloka kuncike ezintweni ezimbalwa ezifana nesisindo samangqamuzana, izinga lokushintshwa, ukuba khona kwezithasiselo, nezimo zokucubungula. Kodwa-ke, ngizokunikeza ukubuka konke kwezici ezithonya ukuwohloka kokushisa kwe-HPC, izinga lokushisa elivamile lokuwohloka, kanye nezinye zezinhlelo zayo zokusebenza.
1. Isakhiwo Sekhemikhali se-HPC:
I-Hydroxypropyl cellulose iphuma ku-cellulose etholakala ngokwelapha i-cellulose nge-propylene oxide. Lokhu kuguqulwa kwamakhemikhali kunikeza ukuncibilika nezinye izinto ezifiselekayo ku-cellulose, okwenza kube usizo ezinhlelweni ezihlukahlukene.
2. Izinto Ezithinta Ukuwohloka Kokushisa:
a. Isisindo samangqamuzana: Isisindo samangqamuzana aphezulu i-HPC ijwayele ukuba nokuzinza okuphezulu kwe-thermal ngenxa yamandla anamandla e-intermolecular.
b. I-Degree of Substitution (DS): Izinga lokushintshwa kwe-hydroxypropyl lithonya ukuzinza kokushisa kwe-HPC. I-DS ephezulu ingase iholele emazingeni okushisa okuwohloka aphansi ngenxa yokwanda kokuba sengozini kokuqhekeka okushisayo.
c. Ukuba khona Kwezengezo: Ezinye izithasiselo zingase zithuthukise ukuzinza okushisayo kwe-HPC ngokusebenza njengeziqinisi noma ama-antioxidants, kanti ezinye zingasheshisa ukuwohloka.
d. Izimo Zokucubungula: Izimo i-HPC ecutshungulwa ngaphansi kwazo, njengezinga lokushisa, ingcindezi, nokuchayeka emoyeni noma kwezinye izindawo ezisebenzayo, zingathinta ukuqina kwayo okushisayo.
3. I-Thermal Degradation Mechanism:
Ukuwohloka okushisayo kwe-HPC ngokuvamile kuhilela ukuphuka kwamabhondi e-glycosidic kumgogodla we-cellulose kanye nokuqhekeka kokuxhumanisa kwe-ether okwethulwa esikhundleni se-hydroxypropyl. Le nqubo ingaphumela ekwakhekeni kwemikhiqizo eguquguqukayo njengamanzi, isikhutha, nama-hydrocarbon ahlukahlukene.
4. Ibanga Lezinga Lokushisa Elijwayelekile:
Izinga lokushisa lokuwohloka le-HPC lingahluka kakhulu ngokuya ngezinto ezishiwo ngenhla. Ngokuvamile, ukuwohloka kokushisa kwe-HPC kuqala cishe ku-200°C futhi kungase kuqhubeke kuze kufike emazingeni okushisa angaba ngu-300-350°C. Nokho, lobu bubanzi bungashintsha kuye ngezici ezithile zesampula ye-HPC nezimo lapho ivezwe khona.
5. Izicelo ze-HPC:
I-Hydroxypropyl cellulose ithola ukusetshenziswa ezimbonini ezahlukahlukene:
a. Ezemithi: Isetshenziswa njenge-thickener, binder, i-ejenti yangaphambili yefilimu, kanye ne-ejenti ekhishwayo elawulwayo ekwenziweni kwemithi njengamaphilisi, amaphilisi, nama-topical preparations.
b. Izimonyo: I-HPC isetshenziswa kuzimonyo nemikhiqizo yokunakekelwa komuntu siqu njenge-ejenti ejiyayo, i-stabilizer, nefilimu yangaphambili emikhiqizweni efana namaloshini, okhilimu, nokwakhiwa kwezinwele.
c. Imboni Yokudla: Embonini yokudla, i-HPC isebenza njenge-thickener, stabilizer, kanye ne-emulsifier emikhiqizweni efana namasoso, amasobho, nama-dessert.
d. Izicelo Zezimboni: I-HPC iphinde iqashwe ezinhlelweni ezihlukene zezimboni ezifana noyinki, ama-coatings, nama-adhesives ngenxa yokwakheka kwefilimu kanye nezakhiwo zayo ze-rheological.
izinga lokushisa elishisayo lokuwohloka kwe-hydroxypropyl cellulose liyahlukahluka kuye ngezici ezifana nesisindo samangqamuzana, izinga lokushintsha, ukuba khona kwezithasiselo, nezimo zokucubungula. Nakuba ukuwohloka kwawo kuvame ukuqala cishe ku-200°C, kungaqhubeka kuze kufike emazingeni okushisa angama-300-350°C. Ukuqonda izici ezithonya ukuzinza kwayo kwe-thermal kubalulekile ekuthuthukiseni ukusebenza kwayo ezinhlelweni ezihlukahlukene kuzo zonke izimboni ezahlukene.
Isikhathi sokuthumela: Mar-26-2024