Ntlafatso ea selulose ea Hydroxyethyl

Hydroxyethyl cellulose(HEC) ke polymer e qhibilihang ka metsing e sebelisoang haholo liindastering tse fapaneng tse kang meriana, litlolo le lijo. HEC e tsoa ho selulose, polymer ea tlhaho e fumanoang limela, 'me e fetotsoe ka lihlopha tsa hydroxyethyl ho ntlafatsa ho qhibiliha ha metsi le lisebelisoa tse ling.

Ntlafatso ea HEC e kenyelletsa mehato e mengata ea ho hloekisa le ho fetola polymer ho finyella litlhoko tse khethehileng bakeng sa tšebeliso ea eona e reriloeng. Tse latelang ke tse ling tsa mehato e tloaelehileng e amehang ntlafatsong ea HEC:

1. Tlhoekiso: Mohato oa pele oa ntlafatso ea HEC ke ho hloekisoa ha thepa e tala ea cellulose. Sena se kenyelletsa ho tlosa litšila tse kang lignin, hemicellulose, le litšila tse ling tse ka amang boleng le thepa ea sehlahisoa sa ho qetela. Ho hloekisoa ho ka finyelloa ka mekhoa e fapaneng e kang ho hlatsoa, ​​ho soeufala, le phekolo ea enzymatic.

2. Alkalization: Ka mor'a ho hloekisoa, selulose e tšoaroa ka tharollo ea alkaline ho eketsa ts'ebetso ea eona le ho thusa ho kenyelletsa lihlopha tsa hydroxyethyl. Hangata alkalization e etsoa ka sodium hydroxide kapa potasiamo hydroxide ka mocheso o phahameng le likhatello.

3. Etherification: Mohato o latelang ke ho kenya lihlopha tsa hydroxyethyl mokokotlong oa cellulose. Sena se etsoa ka etherification, e kenyelletsang ho itšoara ka selulose ka ethylene oxide ka pel'a motsoako oa alkaline. Tekanyo ea etherification e ka laoloa ho fihlela thepa e lakatsehang joalo ka viscosity, solubility, le botsitso ba mocheso.

4. Neutralization: Ka mor'a hore etherification, sehlahisoa se fokotsehe ho tlosa alkali leha e le efe e setseng le ho fetola pH ho ea sebakeng se loketseng bakeng sa tšebeliso e reriloeng. Ho se nke lehlakore ho ka etsoa ka asiti e kang acetic acid kapa citric acid.

5. Ho hloekisa le ho omisa: Mohato oa ho qetela ke ho hloekisa le ho omisoa ha sehlahisoa se hloekisitsoeng sa HEC. Hangata sehlahisoa se sefshoa ho tlosa litšila tse setseng ebe se omisoa sebakeng se loketseng sa mongobo bakeng sa polokelo le lipalangoang.

Ka kakaretso, ntlafatso ea HEC e kenyelletsa letoto la mehato ea ho hloekisa le ho fetola thepa e tala ea selulose ho hlahisa polymer ea boleng bo phahameng, e nang le metsi e nang le thepa e khethehileng bakeng sa tšebeliso ea eona.