I-Hydroxyyethyl cellulose (HEC) yi-nonic, i-polymer esolulekayo yamanzi etholakala ku-cellulose ngokuguqulwa kwamakhemikhali. Ithola ukusetshenziswa okubanzi kwezimboni ezahlukahlukene ngenxa yezakhiwo zayo ezihlukile, njengokuqina, ukuzinza, kanye namakhono akha amafilimu. Kuzinhlelo zokusebenza lapho ukuqina kwe-PH kubalulekile, ukuqonda ukuthi i-HEC iziphatha kanjani ngaphansi kwezimo ezahlukahlukene ze-PH ibalulekile.
Ukuqina kwe-PH ye-HEC kubhekisele emandleni ayo okugcina ubuqotho bayo, izimbobo ze-rheological, kanye nokwenzala izimo ezahlukahlukene. Lokhu kuzinza kubalulekile kuzinhlelo zokusebenza ezinjengemikhiqizo yokunakekelwa komuntu siqu, imithi yemithi, izimbobo, kanye nezinto zokwakha indawo ezungezile zingahluka kakhulu.
Isakhiwo:
I-HEC ijwayele ukuhlanganiswa ngokuphendula i-cellulose nge-ethylene oxide ngaphansi kwezimo ze-alkaline. Le nqubo iholela ekufumbeni kwamaqembu we-hydroxyl we-cellulose backbone nge-hydroxyethyl (-Och2chch.coh). Izinga lokufaka esikhundleni (DS) libonisa inani eliphakathi lamaqembu ama-hydroxyethyl per ngeyunithi ye-Anhydroglucose eCellulose Chain.
Izakhiwo:
I-Solubinity: I-HEC incane emanzini nokwakha okucacile, izixazululo ze-viscous.
I-Viscosity: Ibonisa isimilo se-Pseudoplastic noma i-Shear-Twning-Twning, okusho ukuthi i-viscosity yayo inciphisa ngaphansi kwengcindezi ye-shear. Le mpahla yenza kube wusizo kuzinhlelo zokusebenza lapho ukugeleza kubalulekile, njengopende kanye nendwangu.
Ukuqina
Ukukhamulwa ifilimu: Kungakha amafilimu aguqukayo futhi avele obala lapho omisiwe, okuyinzuzo kwizicelo ezinjengezinamathiselo nezingubo.
Ukuqina kwe-HEC
Ukuqina kwe-PH ye-HEC kuthonywa yizici eziningana, kufaka phakathi isakhiwo samakhemikhali se-polymer, ukusebenzisana nendawo ezungezile, nanoma yiziphi izengezo ezikhona ekwakhiweni.
Ukuqina kwe-PH ye-HEC kumabanga ahlukile we-PH:
1. I-Acidic PH:
Kwa-Acidic PH, i-HEC ivame ukuzinza kepha ingahle i-hydrolysis ngezikhathi ezengeziwe ngaphansi kwezimo ezinzima ze-acidic. Kodwa-ke, kuzinhlelo zokusebenza ezisebenzayo kakhulu, ezinjengemikhiqizo yokunakekelwa komuntu siqu kanye nengubo, lapho kuhlangana khona i-acidic PH, i-HEC ihlala iqinile ngaphakathi kobubanzi be-PH obujwayelekile (PH 3 kuya ku-6). Ngaphandle kwe-PH 3, ubungozi be-hydrolysis bukhuphuka, okuholela ekunciphiseni kancane kancane ekuboneni nasekusebenzeni. Kubalulekile ukuqapha i-PH yokwakhiwa okuqukethe i-HEC futhi uwaguqule njengoba kunesidingo sokugcina uzinzo.
2. I-PH PH:
U-HEC ukhombisa ukuqina okuhle ngaphansi kwezimo ezingathathi hlangothi (Ph 6 kuye ku-8). Leli banga le-PH livame kakhulu kuzicelo eziningi, kufaka phakathi izimonyo, amakhamishini nemikhiqizo yasendlini. I-HEC-equkethe imibono yayo igcina i-viscosity yayo, ukuqina kwezakhiwo, kanye nokusebenza okuphelele ngaphakathi kwaleli banga le-PH. Kodwa-ke, izici ezinjengamandla okushisa kanye nama-ionic amandla angaba nomthelela ukuqina futhi kufanele abhekwe ngesikhathi sokuthuthukiswa kokwenza.
3. I-Alkaline PH:
I-HEC ayizinzile ngaphansi kwezimo ze-Alkaline eziqhathaniswa ne-acidic noma engathathi hlangothi pH. Emazingeni aphezulu we-PH (ngaphezulu kwe-PH 8), i-HEC ingahle ibe nokudilika, okuphumela ekunciphiseni ekuboneni nasekulahlekelweni kokusebenza. I-Alkaline Hydrolysis ye-ether ukuxhumana phakathi kwe-cellulose backbone kanye namaqembu we-hydroxyethyl angenzeka, okuholele e-Chain Scomis futhi anciphise isisindo se-molecular. Ngakho-ke, ekwakhiweni kwe-alkaline okufana nokuhlanza noma izinto zokwakha, amanye ama-polymers noma ama-stivilizer angathandwa nge-hec.
Izici ezithonya ukuqina kwe-PH
Izici eziningana zingathonya ukuzinza kwe-PH ye-HEC:
I-degree yokufaka esikhundleni (DS): I-HEC enamanani aphezulu we-DS ivame ukubanziswa kakhulu kulo lonke elangeni le-PH ngenxa yokufaka esikhundleni se-hydroxyethyl amaqembu ane-hydroxyly, okuqinisa amandla i-hydrolysis.
Ukushisa: amazinga okushisa aphakeme angasheshisa ukusabela kwamakhemikhali, kufaka phakathi i-hydrolysis. Ngakho-ke, ukulondolozwa kokugcina okufanelekile kanye namazinga okushisa kubalulekile ukuze kulondolozwe ukuqina kwe-PH ye-HEC-equkethe amafomu.
Amandla we-Ionic: Ukugxila okuphezulu kosawoti noma amanye ama-ion ekwakhekeni kungathinta ukuqina kwe-HEC ngokuthinta i-solubelity yayo nokusebenzisana ngama-molecule wamanzi. Amandla e-Ionic kufanele enzelwe ukunciphisa imiphumela yokuhlanza.
Izengezo: Ukufakwa kwezithasiselo ezinjenge-surfactants, ama-proservative, noma ama-ageffers angathonya ukuzinza kwe-PH kwezindlela ze-HEC. Ukuhlolwa kokuvumelana kufanele kwenziwe ukuze kuqinisekiswe ukuhambisana okungeziwe nokuqina.
Izicelo kanye nokucatshangelwa kokuqamba
Ukuqonda ukuqina kwe-PH ye-HEC kubalulekile kumakhemikhali ezimbonini ezahlukahlukene.
Nayi eminye imininingwane eqondene nohlelo:
Imikhiqizo Yokunakekelwa Kwakho: EmaShampoos, ama-conditios, kanye ne-lotions, ukulondolozela i-PH ebangeni olifunayo (imvamisa ezungeze ukungathathi hlangothi) kuqinisekisa ukuqina nokusebenza kwe-hec njenge-ejenti yokuqina nokumisa.
I-Pharmaceuticals: I-HEC isetshenziswa ekumisweni kokumiswa komlomo, izixazululo ze-ophthalmic, kanye nokwakhiwa kwezihloko. Izakhi kufanele zenziwe futhi zigcinwe ngaphansi kwezimo ezigcina ukuqina kwe-HEC ukuqinisekisa ukusebenza kahle komkhiqizo nempilo eshalofini.
I-Coatings nopende: I-HEC iqashwa njenge-Rheology modifier kanye nokuqina kupende osuselwa emanzini kanye nezambatho. Amakhemikhali kufanele alinganise izidingo ze-Ph nezinye izindlela zokusebenza ezifana nokubonakala, ukulinganisa, kanye nokwakheka kwefilimu.
Izinto zokwakha: Emakhiweni e-CEENCEMENT, HEC Izenzo njenge-ejenti yokugcinwa kwamanzi futhi ithuthukisa ukusebenza. Kodwa-ke, izimo ze-alkaline ku usimende zingaphonsela inselelo ukuqina kwe-HEC, kudinga ukukhethwa ngokucophelela nokulungiswa kokwakha.
IHydroxYethyl Cellulose (HEC) inikeza izakhiwo ezibalulekile ze-bheloho kanye nama-realegical ezihlelweni ezahlukahlukene. Ukuqonda ukuzinza kwayo kwe-PH kubalulekile kumakhemikhali ukuthuthukisa ukwakheka okuzinzile futhi okusebenzayo. Ngenkathi u-Hec ekhombisa ukuzinza okuhle ngaphansi kwezimo ezingathathi hlangothi, ukucatshangelwa kumele kwenziwe izindawo ezi-acidic ne-alkali ukuvikela ukonakaliswa futhi kuqinisekiswe ukusebenza kahle. Ngokukhetha iBanga le-HEC elifanele, ukwenza kahle amapharamitha enziwe, kanye nokwenza izimo zokugcina ezifanele, amafomu angabopha izinzuzo ze-HEC zinhlamvu eziningi.
Isikhathi sePosi: Mar-29-2024