Iyini iHydroxypropyl Starch Ether?

I-Hydroxypropyl isitashi ether (HPS) isitashi esishintshiwe esiye saduma kakhulu ezimbonini ezihlukahlukene njenge-ejenti ejiyayo, eqinisayo, kanye ne-emulsifying. Kuwukuphuma kwe-carbohydrate encibilika emanzini etholakala kummbila wemvelo, amazambane, noma isitashi se-tapioca ngenqubo yokuguqulwa kwamakhemikhali ehilela ukwethulwa kwamaqembu e-hydroxypropyl kuma-molecule esitashi.

Ukusetshenziswa kwe-HPS sekudume kakhulu embonini yokudla njengoba kuthuthukisa ukuthungwa, ukuzwakala komlomo, nempilo yeshelufu yemikhiqizo eminingi yokudla. Ivamise ukusetshenziswa kumasobho, amasoso, ama-gravies, ama-puddings, neminye imikhiqizo edinga ukujiya noma ukuqiniswa. I-HPS iphinde isetshenziswe embonini yezemithi ukuze kuthuthukiswe ukulethwa kwezidakamizwa, nasezintweni zokuzicwala kanye nemikhiqizo yokunakekela umuntu siqu njengama-shampoos, okokugcoba, nokhilimu.

Kulesi sihloko, sizohlola izakhiwo, inqubo yokukhiqiza, izinhlelo zokusebenza, nokucatshangelwa kokuphepha kwe-HPS.

Izakhiwo ze-Hydroxypropyl Isitashi Ether

I-Hydroxypropyl starch ether iyimpushana emhlophe, engenaphunga, nenganambitheki encibilika kakhulu emanzini nakwezinye izincibilikisi ze-polar. Inesisindo samangqamuzana esisuka ku-1,000 kuya ku-2,000,000 Daltons, kuye ngezinga lokushintshanisa amaqembu e-hydroxypropyl. I-degree of substitution (DS) ibhekisela enanini eliyisilinganiso lamaqembu e-hydroxypropyl ngeyunithi ngayinye ye-anhydroglucose (AGU) ku-molecule yesitashi. I-DS ephezulu iphumela ku-molecule ye-HPS ene-hydrophilic nencibilika emanzini.

I-HPS itholakala ngezigaba ezahlukene, kuye ngokuthi i-viscosity yayo, usayizi wezinhlayiyana, nezinye izakhiwo. I-viscosity ye-HPS ivamise ukuvezwa ngokuya nge-viscosity yayo yase-Brookfield, elinganiswa nge-centipoise (cP) ngezinga elithile lokugunda kanye nezinga lokushisa. Amabanga e-HPS ane-viscosity ephezulu asetshenziselwa imikhiqizo ewugqinsi, kuyilapho amamaki e-viscosity ephansi asetshenziselwa imikhiqizo emincane.

Usayizi wezinhlayiyana ze-HPS nawo uyimpahla ebalulekile, njengoba uthinta ukuhlakazeka nokugeleza kwayo. I-HPS itholakala ngosayizi abahlukene bezinhlayiyana, kusukela kuzimpushana ezinhle kuye kuma-granules, kuye ngokuthi isetshenziswa kanjani.

Inqubo Yokukhiqiza ye-Hydroxypropyl Starch Ether

Ukukhiqizwa kwe-HPS kuhilela ukuguqulwa kwesitashi semvelo kusetshenziswa ukusabela phakathi kwesitashi ne-propylene oxide (PO), okwethula amaqembu e-hydroxypropyl kuma-molecule esitashi. Inqubo ngokuvamile yenziwa ngesisombululo se-alkaline enamanzi, ngokungezwa kwe-catalyst efana ne-sodium hydroxide noma i-potassium hydroxide.

Inqubo yokuguqula ithonywa izici ezimbalwa, njengesikhathi sokusabela, izinga lokushisa, i-pH, isilinganiso se-PO/isitashi, nokugxiliswa kwe-catalyst. Lezi zici zithinta izinga lokushintsha, isisindo samangqamuzana, nezinye izici zomkhiqizo we-HPS owumphumela.

Isitashi esilungisiwe sibe sesigezwa, sincishisiwe, futhi somiswa ukuze kutholwe impushana emhlophe noma ama-granules. Umkhiqizo we-HPS ube usuhlolelwa izici ezihlukahlukene ezifana ne-viscosity, usayizi wezinhlayiyana, okuqukethwe komswakama, nokuhlanzeka.

Izicelo ze-Hydroxypropyl Isitashi Ether

Ukusetshenziswa kwe-HPS ekwakhiweni kunenzuzo ngezindlela ezihlukahlukene, njengokuthuthukisa amandla nokuqina kukakhonkolo, ukunciphisa okuqukethwe kwamanzi, nokuthuthukisa ukunamathela nokubumbana kodaka. Ezinye zezinhlelo ezijwayelekile ze-HPS ekwakheni yilezi:

1. Ukhonkolo:

I-HPS isetshenziswa kukhonkolo njengesinciphisi samanzi, esinciphisa inani lamanzi adingekayo ekwakhiweni kwengxube enikeziwe. Lokhu kubangela amandla aphezulu kanye nokuqina kukakhonkolo, njengoba amanzi amaningi angenza buthaka ukhonkolo futhi abangele ukuqhekeka kokuncipha. I-HPS iphinde ithuthukise ukusebenza nokugeleza kukakhonkolo, okuzuzisa kumaphrojekthi amakhulu.

2. Udaka:

I-HPS isetshenziswa odakeni njenge-plasticizer, ethuthukisa ukusebenza nokuvumelana kodaka. Lokhu kubangela isibopho esingcono phakathi kodaka kanye namayunithi amatshe, okubalulekile ekuthembekeni kwesakhiwo sesakhiwo. I-HPS iphinde yehlise okuqukethwe kwamanzi odakeni, okuthuthukisa amandla awo nokuqina.

3. Imikhiqizo ye-Gypsum:

I-HPS isetshenziswa emikhiqizweni ye-gypsum efana ne-plaster kanye nenhlanganisela ehlangene njenge-thickener and stabilizer. Lokhu kubangela ukusetshenziswa okushelelayo nokungaguquguquki kwemikhiqizo ye-gypsum, kanye nokunamathela okuthuthukisiwe nokubumbana. I-HPS iphinde ithuthukise isikhathi sokusetha namandla emikhiqizo ye-gypsum, enenzuzo ezinhlelweni zokwakha.

Ngaphezu kwalezi zinhlelo zokusebenza ezingenhla, i-HPS ingasetshenziswa kwezinye izinto zokwakha ezifana nama-coatings, ama-adhesives, nama-sealants. Ukusetshenziswa kwe-HPS ekwakheni kungathuthukisa ikhwalithi, ukusebenza kahle, nokusimama kwamaphrojekthi wokwakha, kanye nokunciphisa izindleko nokumosha.