Tokisetso le thepa ea 'mele ea hydroxypropyl starch ether

Hydroxypropyl starch ether (HPStE) e lokisoa ka mokhoa oa ho fetola lik'hemik'hale o kenyelletsang ho hlahisa lihlopha tsa hydroxypropyl holim'a molek'hule ea starch. Mokhoa oa ho lokisa hangata o kenyelletsa mehato e latelang:

1. Khetho ea Setache: Setache sa boleng bo holimo, seo hangata se nkiloeng mehloling e kang poone, koro, litapole, kapa tapioca, se khethoa e le lisebelisoa tsa ho qala. Khetho ea mohloli oa starch e ka ama thepa ea sehlahisoa sa ho qetela sa HPStE.
2. Ho lokisoa ha starch paste: Setache se khethiloeng se qhalakanngoa ka metsing ho etsa setlolo sa starch. Peista e futhumatsoa ho mocheso o itseng ho gelatinize granules ea starch, e leng ho lumellang hore ho be le ts'ebetso e ntle le ho kenella ha li-reagents mehatong e latelang ea phetoho.
3. Etherification Reaction: The gelatinized starch peste e ntan'o itšoara ka propylene oxide (PO) ka pel'a mokelikeli tlas'a maemo a laoloang. Propylene oxide e sebetsana le lihlopha tsa hydroxyl (-OH) holim'a molek'hule ea starch, e bakang ho khomarela lihlopha tsa hydroxypropyl (-OCH2CH(OH)CH3) mokokotlong oa starch.
4. Neutralization le tlhoekiso: Kamora karabelo ea etherification, motsoako oa karabelo ha o nke lehlakore ho tlosa li-reagents kapa li-catalyst tse feteletseng. Sephetho sa hydroxypropyl starch ether se hloekisoa ka mekhoa e kang ho sefa, ho hlatsoa le ho omisoa ho tlosa litšila le lik'hemik'hale tse setseng.
5. Phetoho ea boholo ba Particle: Thepa ea 'mele ea HPStE, joalo ka boholo ba likaroloana le kabo, e ka fetoloa ka mekhoa ea ho sila kapa ea ho sila ho fihlela litšobotsi tse lakatsehang bakeng sa lits'ebetso tse itseng.

Thepa ea 'mele ea hydroxypropyl starch ether e ka fapana ho latela lintlha tse kang degree of substitution (DS), boima ba molek'hule, boholo ba likaroloana, le maemo a ts'ebetso. Lintho tse ling tse tloaelehileng tsa 'mele tsa HPStE li kenyelletsa:

1. Ponahalo: HPStE hangata ke phofo e tšoeu ho isa ho e tšoeu e nang le kabo ea boholo bo botle ba likaroloana. The particle morphology e ka 'na ea fapana ho tloha ho spherical ho ea ho tse sa tloaelehang ho itšetlehile ka mokhoa oa tlhahiso.
2. Boholo ba Particle: Boholo ba karoloana ea HPStE bo ka tloha ho li-micrometer tse seng kae ho isa ho mashome a micrometer, ka tšusumetso e kholo ho qhalakaneng ha eona, ho qhibiliha ha eona le ho sebetsa lits'ebetsong tse fapaneng.
3. Bongata ba Bongata: Boima ba bongata ba HPStE bo ama ho phalla ha eona, litšobotsi tsa ho sebetsana le litlhoko tsa ho paka. Hangata e lekantsoe ka ligrama ka cubic centimeter (g/cm³) kapa lik'hilograma ka litara (kg/L).
4. Solubility: HPStE ha e qhibilihe metsing a batang empa e ka qhalakanngoa le ho ruruha ka metsing a chesang, ea etsa litharollo tsa viscous kapa li-gel. The solubility le hydration properties tsa HPStE li ka fapana ho itšetlehile ka lintlha tse kang DS, boima ba molek'hule, le mocheso.
5. Viscosity: HPStE e bonts'a thepa ea ho laola le rheological tsamaisong ea metsi, e susumetsang viscosity, boitšoaro ba ho phalla, le botsitso ba metsoako. The viscosity ea tharollo ea HPStE e itšetlehile ka lintlha tse kang ho tsepamisa mohopolo, mocheso le sekhahla sa ho kuta.
6. Hydration Rate: Sekhahla sa hydration sa HPStE se bolela sekhahla seo e monyang metsi ka sona le ho ruruha ho etsa litharollo tsa viscous kapa li-gel. Thepa ena ke ea bohlokoa lits'ebetsong moo ho hlokahalang hore ho be le hydration e potlakileng le e teteaneng.

tokiso le thepa ea 'mele ea hydroxypropyl starch ether e etselitsoe ho fihlela litlhoko tse khethehileng tsa kopo le litekanyetso tsa ts'ebetso, e leng se etsang hore e be tlatsetso e fapaneng le ea bohlokoa liindasteri le libopeho tse fapaneng.