I-Hydroxyethyl cellulose (HEC) yi-ether e-soluble nonionic cellulose ether, kwaye umthombo wayo oyintloko yi-cellulose yendalo. I-cellulose yendalo ikhona ngokubanzi kwizityalo kwaye iyona nto iphambili kwiindonga zeseli zesityalo. Ngokukodwa, i-hydroxyethyl cellulose yenziwa ngokuphendula ngokwekhemikhali iselulosi yendalo kunye ne-ethylene oxide phantsi kweemeko ze-alkaline. Le nkqubo yokusabela kweekhemikhali idla ngokubizwa ngokuba yi-ethoxylation, kwaye isiphumo kukuba amaqela e-hydroxyl kwiimolekyuli zeselulosi zendalo athatyathelwa indawo ngokuyinxenye okanye ngokupheleleyo ukuze enze i-hydroxyethyl cellulose kunye namaqela e-ethoxy.
Oku kulandelayo ngamanyathelo athile enkqubo yokulungiselela i-hydroxyethyl cellulose:
Umthombo we-cellulose: I-cellulose idla ngokutsalwa kwizinto zezityalo ezifana nomqhaphu kunye neenkuni. I-cellulose ekhutshiweyo ihlanjululwe kwaye ixutywe ukuze isuse ukungcola okufana ne-lignin, i-hemicellulose kunye nezinye izinto ezingezona i-cellulose ukufumana i-cellulose ephezulu.
Unyango lwe-alkalinization: Hlanganisa i-cellulose kunye nesisombululo se-sodium hydroxide (NaOH), kunye namaqela e-hydroxyl kwi-cellulose aphendule nge-sodium hydroxide ukuvelisa i-sodium cellulose. Kule nkqubo, i-cellulose isakhiwo se-molecular yandisa kwinqanaba elithile, okwenza kube lula ukusabela nge-ethylene oxide.
Ukusabela kwe-ethoxylation: I-alkalized cellulose ye-sodium ixutywe ne-ethylene oxide (C2H4O) kwiqondo lokushisa elithile kunye noxinzelelo. Isakhiwo seringi se-ethylene oxide sivula ukwenza amaqela e-ethoxy (-CH2CH2OH), adibanisa kunye namaqela e-hydroxyl kwii-molecule ze-cellulose ukwenza i-hydroxyethyl cellulose. Le nkqubo yokusabela inokuqhutywa ngokwemigangatho eyahluka-hlukeneyo, okukhokelela kwiselulosi ye-hydroxyethyl enedigri ezahlukeneyo zokutshintshwa.
Emva konyango: Imveliso emva kokuphendula ngokuqhelekileyo iqulethe i-alkali engaphendulwanga, i-solvents kunye nezinye iimveliso. Ukuze ufumane i-cellulose ecocekileyo ye-hydroxyethyl, amanyathelo onyango emva kokunyanga njenge-neutralization, ukuhlamba kunye nokomisa kuyadingeka. Injongo yala manyathelo onyango kukususa i-alkali eshiyekileyo, i-solvents kunye neemveliso zokufumana imveliso yokugqibela ecocekileyo.
Iselulosi yeHydroxyethyl isetyenziswe ngokubanzi kumashishini ahlukeneyo ngenxa yeepropathi zayo ezizodwa zeekhemikhali kunye nokusebenza okugqwesileyo. Ngokukodwa, i-hydroxyethyl cellulose inokunyibilika kakuhle kwamanzi, ukutyeba, ukuzinza, ukwenza ifilimu kunye nokuthambisa, kwaye iqhele ukusetyenziswa kwezi ndawo zilandelayo:
Izinto zokwakha: Kwizinto zokwakha, i-hydroxyethyl cellulose isetyenziswa kakhulu njenge-thickener kunye ne-agent yokugcina amanzi kwizinto ezisekelwe kwi-samente kunye ne-gypsum-based based materials. Inokuphucula ngokufanelekileyo ukusebenza kokwakhiwa kwezinto, ukuphucula ukugcinwa kwamanzi, ukusebenza kunye nokuchasana nodaka, ukwandisa ixesha elivulekileyo kunye nokuqinisekisa inkqubela phambili yokwakhiwa.
Umzi-mveliso wepeyinti: Kwipeyinti, i-hydroxyethyl cellulose isetyenziswa njenge-thickener, i-agent exhomayo kunye ne-emulsifier yokuphucula i-rheology kunye nokuzinza kwepeyinti, ukuthintela ukuchithwa kwe-pigment sedimentation, kunye nokuphucula ukucaca kunye nokucwebezela kwengubo.
Izithambiso kunye neemveliso zokhathalelo lomntu: Kwizinto zokuthambisa, i-hydroxyethyl cellulose ihlala isetyenziswa njenge-thickener, ifilimu yangaphambili kunye ne-moisturizer. Inokubonelela ngeemveliso ngokuziva kakuhle, ukuphucula ukuzinza kwemveliso kunye nokunamathela, kunye nokuphucula umphumo wokufuma.
Ishishini lamachiza: Kwintsimi yamachiza, i-hydroxyethyl cellulose isetyenziswa njenge-excipient kumalungiselelo amayeza. Njengenxalenye yeepilisi ezikhutshwa ngokuqhubekayo, iingubo zefilimu, njl., inokulawula izinga lokukhululwa kweziyobisi kunye nokuphucula ukuzinza kunye ne-bioavailability yamachiza.
Ishishini lokutya: Kushishino lokutya, i-hydroxyethyl cellulose isetyenziswa njengesongezo sokutya ukuze idlale indima ekukhuleni, emulsification nasekuzinziseni. Isetyenziswa ngokubanzi kwiziselo, i-condiments, iimveliso zobisi kunye nokunye ukutya ukuphucula ukuthungwa kunye nencasa yeemveliso.
I-Hydroxyethyl cellulose nayo inee-aplikeshini ezibalulekileyo ekutsalweni kwe-oyile, ukwenza iphepha, ukuprinta i-textile kunye nemizi-mveliso yokudaya. Ekutsalweni kweoyile, i-hydroxyethyl cellulose isetyenziswa njenge-thickener kunye nokuzinzisa ulwelo lokomba, olunokuphucula amandla okunqunyanyiswa kolwelo lokomba kunye nokuthintela ukudilika kodonga lwequla. Kwishishini lephepha, lisetyenziswe njenge-arhente yokugcina kunye ne-ejenti yokuqinisa ukuphucula amandla kunye nokuqina kwephepha. Kushicilelo lwe-textile kunye nokudaya, i-hydroxyethyl cellulose isetyenziswa njenge-thickener ukunceda ukuprinta kunye nokudaya uludaka ukuba lusasazwe ngokulinganayo kwaye luphucule umgangatho wokuprinta kunye nokudaya.
Iselulosi yeHydroxyethyl ifumaneka kwiselulosi yendalo ngothotho lweekhemikhali. Ukusetyenziswa kwayo okubanzi akukona nje ngenxa yeempawu zayo ezibalaseleyo zomzimba kunye neekhemikhali, kodwa nangenxa yokuba inokubonelela ngezisombululo ezahlukahlukeneyo kumashishini amaninzi ukuhlangabezana neemfuno ezahlukeneyo zobugcisa.
Ixesha lokuposa: Aug-13-2024