Ukucocwa kwe-Hydroxyethyl cellulose

Iselulosi yeHydroxyethyl(HEC) yipolima enyibilikayo emanzini esetyenziswa kakhulu kumashishini ahlukeneyo afana namayeza, izinto zokuthambisa, kunye nokutya. I-HEC ivela kwi-cellulose, i-polymer yendalo efunyenwe kwizityalo, kwaye iguqulwa kunye namaqela e-hydroxyethyl ukuphucula ukunyibilika kwamanzi kunye nezinye iimpawu.

Ukucocwa kwe-HEC kubandakanya amanyathelo amaninzi okucoca kunye nokuguqula i-polymer ukuhlangabezana neemfuno ezithile zokusetyenziswa kwayo. Oku kulandelayo ngamanye amanyathelo aqhelekileyo abandakanyekayo ekucokiseni i-HEC:

1. Ukuhlanjululwa: Isinyathelo sokuqala ekuphuculweni kwe-HEC kukucocwa kwe-cellulose eluhlaza. Oku kubandakanya ukususa ukungcola okufana ne-lignin, i-hemicellulose, kunye nezinye izinto ezingcolileyo ezinokuchaphazela umgangatho kunye neempawu zemveliso yokugqibela. Ukuhlanjululwa kunokufezekiswa ngeendlela ezahlukeneyo ezifana nokuhlamba, ukuxutywa, kunye nonyango lwe-enzymatic.

2. I-Alkalization: Emva kokuhlanjululwa, i-cellulose iphathwa ngesisombululo se-alkaline ukwandisa ukusebenza kwayo kwakhona kwaye iququzelele ukuqaliswa kwamaqela e-hydroxyethyl. I-alkalization idla ngokusetyenziswa nge-sodium hydroxide okanye i-potassium hydroxide kumaqondo obushushu aphezulu kunye noxinzelelo.

3. I-Etherification: Inyathelo elilandelayo kukuqaliswa kwamaqela e-hydroxyethyl kwi-cellulose backbone. Oku kwenziwa nge-etherification, ebandakanya ukusabela kwi-cellulose nge-ethylene oxide phambi kwe-alkaline catalyst. Iqondo le-etherification linokulawulwa ukufezekisa iipropati ezifunwayo ezifana ne-viscosity, ukunyibilika, kunye nokuzinza kwe-thermal.

4. I-Neutralization: Emva kwe-etherification, imveliso ingathathi hlangothi ukuze isuse nayiphi na i-alkali eseleyo kwaye ilungelelanise i-pH kuluhlu olufanelekileyo lokusetyenziswa ekujoliswe kuyo. I-neutralization inokwenziwa nge-asidi efana ne-acetic acid okanye i-citric acid.

5. Ukucoca kunye nokumisa: Isinyathelo sokugqibela kukuhluzwa kunye nokomisa kwemveliso ye-HEC ecocekileyo. Imveliso idla ngokuhluzwa ukususa nakuphi na ukungcola okuseleyo ize yomiswe kumxholo wokufuma ofanelekileyo wokugcinwa nokuhanjiswa.

Ngokubanzi, ukulungiswa kwe-HEC kubandakanya uchungechunge lwamanyathelo okuhlambulula nokuguqula i-cellulose ekrwada ukuvelisa i-polymer ephezulu, e-soluble yamanzi kunye neempawu ezithile zokusetyenziswa kwayo.