I-Hydroxyethyl cellulose (HEC) i-ether ye-cellulose engeyiyo i-ionic esetyenziswa ngokubanzi ekwakheni, iingubo, i-petroleum, iikhemikhali zemihla ngemihla kunye nezinye iindawo. Inokuqina okulungileyo, ukumiswa, ukusabalalisa, i-emulsification, ifilimu-ifom, i-colloid yokukhusela kunye nezinye iipropati, kwaye i-thickener ebalulekileyo kunye ne-stabilizer.
1. Ukulungiswa kwemathiriyeli ekrwada
Eyona mathiriyeli ekrwada ye-hydroxyethyl cellulose yi-cellulose yendalo. I-cellulose idla ngokukhutshwa kwimithi, ikotoni okanye ezinye izityalo. Inkqubo yokukhutshwa kwe-cellulose ilula, kodwa ifuna ukucoceka okuphezulu ukuqinisekisa ukusebenza kwemveliso yokugqibela. Ngenxa yesi sizathu, iindlela zeekhemikhali okanye zoomatshini zidla ngokusetyenziselwa ukuphatha i-cellulose kwangaphambili, kubandakanywa ukuchithwa, ukungcola, ukuhlambalaza kunye namanye amanyathelo okususa ukungcola kunye neengxenye ze-non-cellulose.
2. Unyango lwe-alkalization
Unyango lwe-alkalization linyathelo eliphambili kwinkqubo yokuvelisa i-hydroxyethyl cellulose. Injongo yeli nyathelo kukuvula iqela le-hydroxyl (-OH) kwitsheyini ye-cellulose ye-molecular ukwenza lula ukusabela kwe-etherification elandelayo. Isisombululo se-sodium hydroxide (NaOH) sidla ngokusetyenziswa njenge-alkalizing agent. Inkqubo ethile yile: xuba i-cellulose kunye nesisombululo se-sodium hydroxide ukuze udumbe ngokupheleleyo kwaye usasaze i-cellulose phantsi kweemeko ze-alkaline. Ngeli xesha, amaqela e-hydroxyl kwiimolekyuli ze-cellulose asebenza ngakumbi, elungiselela ukusabela kwe-etherification elandelayo.
3. Ukusabela kwe-Etherification
Ukusabela kwe-Etherification linyathelo elingundoqo kwimveliso ye-hydroxyethyl cellulose. Le nkqubo kukwazisa i-ethylene oxide (eyaziwa ngokuba yi-ethylene oxide) kwi-cellulose emva konyango lwe-alkalinization, kwaye iphendule kunye namaqela e-hydroxyl kwii-molecule ze-cellulose ukuvelisa i-cellulose ye-hydroxyethyl. Ukusabela ngokuqhelekileyo kuqhutyelwa kwi-reactor evaliweyo, ubushushu bokusabela bulawulwa ngokubanzi kwi-50-100 ° C, kwaye ixesha lokuphendula livela kwiiyure ezininzi ukuya kwiiyure ezingaphezu kweshumi. Imveliso yokugqibela yempendulo yi-partially hydroxyethylated cellulose ether.
4. Ukungathathi hlangothi kunye nokuhlamba
Emva kokuba i-etherification reaction igqityiwe, i-reactants idla ngokuba nenani elikhulu le-alkali engaphendulwanga kunye neemveliso. Ukuze ufumane imveliso ecocekileyo ye-hydroxyethyl cellulose, ukungathathi hlangothi kunye nokuhlamba unyango kufuneka kuqhutywe. Ngokuqhelekileyo, i-asidi ye-dilute (efana ne-dilute hydrochloric acid) isetyenziselwa ukuphazamisa i-alkali eseleyo kwi-reaction, kwaye emva koko i-reactants ihlanjwa ngokuphindaphindiweyo ngamanzi amaninzi ukususa ukungcola kwamanzi kunye neemveliso. Iselulosi yehydroxyethyl ehlanjiweyo ikhona ngokohlobo lwekeyiki yesihluzo esimanzi.
5. Ukuphelelwa ngamanzi emzimbeni kunye nokomisa
Ikhekhe elimanzi emva kokuhlamba linomxholo ophezulu wamanzi kwaye kufuneka lihlanjululwe kwaye lomiswe ukuze lifumane imveliso ye-powder hydroxyethyl cellulose. Ukuphelelwa ngamanzi emzimbeni ngokuqhelekileyo kuqhutyelwa nge-vacuum filtration okanye ukuhlukana kwe-centrifugal ukususa amanzi amaninzi. Emva koko, ikhekhe elimanzi lithunyelwa kwisixhobo sokumisa ukuze some. Izixhobo zokomisa eziqhelekileyo ziquka izixhobo zokomisa imigqomo, izixhobo zokomisa i-flash kunye ne-spray dryers. Ubushushu bokomisa bulawulwa ngokubanzi kwi-60-120 ℃ ukunqanda ubushushu obugqithisileyo ekubangeleni ukuthotywa kwemveliso okanye ukuthotywa kokusebenza.
6. Ukugaya kunye nokuHlola
I-cellulose ye-hydroxyethyl eyomileyo idla ngokuba yibhloko enkulu okanye i-granular material. Ukuze kuququzelelwe ukusetyenziswa kunye nokuphucula ukusasazeka kwemveliso, kufuneka ihlanjwe kwaye ihlolwe. Ukugaya ngokuqhelekileyo kusebenzisa i-grinder yomatshini ukucola iibhloko ezinkulu zezinto zibe ngumgubo ocolekileyo. Ukuhlola kukwahlula iinqununu ezinqabileyo ezingafikeleleki kwi-particle efunekayo kwi-powder ecocekileyo ngokusebenzisa izikrini ezinemibhobho eyahlukeneyo ukuqinisekisa ukufana okufanayo kwemveliso yokugqibela.
7. Ukupakishwa kweMveliso kunye noGcino
Imveliso ye-cellulose ye-hydroxyethyl emva kokusila kunye nokuhlola inomlinganiselo othile we-fluidity kunye ne-dispersibility, efanelekileyo ukusetyenziswa ngokuthe ngqo okanye ukuqhutyelwa phambili. Imveliso yokugqibela kufuneka ipakishwe kwaye igcinwe ukukhusela ukufuma, ukungcola okanye i-oxidation ngexesha lokuthutha kunye nokugcinwa. Izinto zokupakisha ezinobungqina bokufuma kunye ne-anti-oxidation ezifana neengxowa ze-aluminium foil okanye i-multi-layer composite bags zidla ngokusetyenziselwa ukupakisha. Emva kokupakishwa, imveliso kufuneka igcinwe kwindawo epholileyo neyomileyo, igweme ilanga elithe ngqo kunye nokushisa okuphezulu kunye neemeko zomswakama ophezulu ukuze kuqinisekiswe ukusebenza kwayo okuzinzile.
Inkqubo yokuvelisa i-hydroxyethyl cellulose ikakhulu ibandakanya ukulungiswa kwezinto eziluhlaza, unyango lwe-alkalization, i-etherification reaction, i-neutralization kunye nokuhlamba, ukuchithwa kwamanzi kunye nokomisa, ukugaya kunye nokuhlola, kunye nokugcinwa kwemveliso yokugqibela. Isinyathelo ngasinye sineemfuno zenkqubo ekhethekileyo kunye namanqaku okulawula. Iimeko zokusabela kunye neenkcukacha zokusebenza kufuneka zilawulwe ngokungqongqo ngexesha lenkqubo yokuvelisa ukuqinisekisa umgangatho kunye nokusebenza okuzinzileyo kwemveliso. Esi sixhobo se-polymer esisebenzayo sinoluhlu olubanzi lwezicelo kwimveliso yemizi-mveliso kunye nobomi bemihla ngemihla, ebonisa ukubaluleka kwayo okungenakuthathelwa indawo.
Ixesha lokuposa: Aug-21-2024