Ukulungiswa kanye nezakhiwo ezibonakalayo ze-hydroxypropyl isitashi ether

I-Hydroxypropyl starch ether (HPStE) ilungiswa ngenqubo yokuguqulwa kwamakhemikhali efaka ukwethulwa kwamaqembu e-hydroxypropyl kwi-molecule yesitashi. Indlela yokulungiselela ngokuvamile ihlanganisa lezi zinyathelo ezilandelayo:

1. Ukukhethwa Kwesitashi: Isitashi sekhwalithi ephezulu, ngokuvamile esitholakala emithonjeni efana nommbila, ukolweni, amazambane, noma i-tapioca, sikhethwa njengento yokuqala. Ukukhethwa komthombo wesitashi kungase kube nomthelela ezimpahleni zomkhiqizo wokugcina we-HPStE.
2. Ukulungiswa Kokunamathisela Kwesitashi: Isitashi esikhethiwe sihlakazwa emanzini ukuze senze inhlama yesitashi. I-paste ishiselwa ezingeni lokushisa elithile ukuze i-gelatinize ama-starch granules, okuvumela ukuphinda kusebenze kangcono kanye nokungena kwama-reagents ezinyathelweni zokuguqula ezilandelayo.
3. Ukusabela kwe-Etherification: I-gelatinized isitashi inama bese isabela nge-propylene oxide (PO) phambi kwe-catalyst ngaphansi kwezimo ezilawulwayo. I-Propylene oxide ihlangana namaqembu e-hydroxyl (-OH) ku-molecule yesitashi, okuholela ekunamathiseleni kwamaqembu e-hydroxypropyl (-OCH2CH(OH)CH3) kumgogodla wesitashi.
4. I-Neutralization and Purification: Ngemva kokusabela kwe-etherification, ingxube yokusabela iyenziwa ingathathi hlangothi ukuze kususwe noma yiziphi izinto ezivuselelayo noma ama-catalyst amaningi. Umphumela we-hydroxypropyl starch ether ube usuhlanzwa ngezinqubo ezinjengokuhlunga, ukuwashwa, nokomiswa ukuze kukhishwe ukungcola namakhemikhali ayinsalela.
5. Ukulungiswa Kosayizi Wezinhlayiyana: Izinto ezibonakalayo ze-HPStE, njengosayizi wezinhlayiyana nokusabalalisa, zingalungiswa ngezinqubo zokugaya noma zokugaya ukuze kuzuzwe izici ezifiselekayo zezinhlelo ezithile zokusebenza.

Izici ezingokoqobo ze-hydroxypropyl starch ether zingahluka kuye ngezinto ezifana nezinga lokushintsha (DS), isisindo samangqamuzana, usayizi wezinhlayiyana, nezimo zokucubungula. Ezinye izakhiwo ezijwayelekile ze-HPStE zifaka:

1. Ukubukeka: I-HPStE ngokuvamile iyimpushana emhlophe ukuya kokumhlophe enokusabalalisa kosayizi wezinhlayiyana ezinhle. I-particle morphology ingase ihluke kusukela kokuyindilinga kuya kokungavamile kuye ngenqubo yokukhiqiza.
2. Usayizi Wezinhlayiyana: Usayizi wezinhlayiyana ze-HPStE bungasukela kuma-micrometer ambalwa ukuya kumashumi ama-micrometer, okunomthelela omkhulu ekuhlakazweni kwayo, ukunyibilika, nokusebenza ezinhlelweni ezihlukene.
3. Ukuminyana Ngobuningi: Ukuminyana kwenqwaba ye-HPStE kuthonya ukugeleza kwayo, izici zokusingatha, nezimfuneko zokupakisha. Ngokuvamile kukalwa ngamagremu ku-cubic centimeter ngayinye (g/cm³) noma amakhilogremu ilitha ngalinye (kg/L).
4. Ukunyibilika: I-HPStE ayincibiliki emanzini abandayo kodwa ingahlakaza futhi ivuvuke emanzini ashisayo, yakhe izixazululo ze-viscous noma amajeli. Izakhiwo zokuncibilika kanye ne-hydration ze-HPStE zingahluka kuye ngezinto ezifana ne-DS, isisindo samangqamuzana, nezinga lokushisa.
5. I-Viscosity: I-HPStE ibonisa ukuqina kanye nezakhiwo zokulawula i-rheological ezinhlelweni ezinamanzi, ezithonya i-viscosity, ukuziphatha kokugeleza, nokuzinza kokwakheka. I-viscosity yezixazululo ze-HPStE incike ezintweni ezifana nokugxilisa ingqondo, izinga lokushisa, nezinga lokugunda.
6. I-Hydration Rate: Izinga le-hydration le-HPStE libhekisela ezingeni lapho imunca khona amanzi futhi ikhukhumale ukuze yakhe izixazululo ze-viscous noma amajeli. Lesi sakhiwo sibalulekile ekusetshenzisweni lapho i-hydration esheshayo nokuqina kuyadingeka.

ukulungiswa kanye nezakhiwo ezibonakalayo ze-hydroxypropyl starch ether zenzelwe ukuhlangabezana nezidingo ezithile zohlelo lokusebenza kanye nemibandela yokusebenza, okuyenza ibe isithasiselo esisebenziseka ngezindlela eziningi nesibalulekile ezimbonini nasezindaweni ezihlukahlukene.