Ho hlahisa hydroxyethyl cellulose (HEC) ho kenyelletsa letoto la liphetoho tsa lik'hemik'hale ho fetola selulose, polymer ea tlhaho e nkiloeng limela. HEC e sebelisoa haholo liindastering tse fapa-fapaneng, tse kenyeletsang meriana, litlolo, lijo le kaho, ka lebaka la thepa ea eona e teteaneng, e tsitsitseng le ea ho boloka metsi.
Selelekela sa Hydroxyethyl Cellulose (HEC)
Hydroxyethyl cellulose (HEC) ke polima e se nang ionic, e qhibilihang ka metsing e tsoang ho selulose ka phetoho ea lik'hemik'hale. E sebelisoa haholo e le ntho e teteaneng, ea gelling le ea ho tsitsisa liindasteri tse fapaneng.
Lisebelisoa tse so fetoloe
Cellulose: Lintho tse ka sehloohong tse tala bakeng sa tlhahiso ea HEC. Cellulose e ka fumanoa ho tsoa linthong tse fapaneng tse thehiloeng limela joalo ka makhasi a patsi, k'hothone kapa masala a temo.
Ethylene Oxide (EO): K'hemik'hale ea bohlokoa e sebelisetsoang ho hlahisa lihlopha tsa hydroxyethyl mokokotlong oa cellulose.
Alkali: Ka tloaelo sodium hydroxide (NaOH) kapa potassium hydroxide (KOH) e sebelisoa e le sesosa sa karabelo.
Mokhoa oa Tlhahiso
Tlhahiso ea HEC e kenyelletsa etherification ea cellulose e nang le ethylene oxide tlas'a maemo a alkaline.
Mehato e latelang e hlalosa mokhoa ona:
1. Phekolo ea pele ea Cellulose
Cellulose e hloekisoa pele ho tlosa litšila tse kang lignin, hemicellulose, le lisebelisoa tse ling. Joale selulose e hloekisitsoeng e omisitsoe ho mongobo o itseng.
2. Karabelo ea Etherification
Ho Lokisoa ha Tharollo ea Alkaline: Tharollo ea metsi ea sodium hydroxide (NaOH) kapa potassium hydroxide (KOH) e lokiselitsoe. Tekanyo ea tharollo ea alkali e bohlokoa haholo 'me e hloka ho ntlafatsoa ho ipapisitsoe le boemo bo lakatsehang ba ho kenya sebaka (DS) ea sehlahisoa sa ho qetela.
Setupo sa Maikutlo: Selulose e hloekisitsoeng e hasane ka har'a tharollo ea alkali. Motsoako o futhumatsoa ho mocheso o itseng, hangata o pota-potileng 50-70 ° C, ho netefatsa hore selulose e ruruhile ka ho feletseng 'me e fumaneha bakeng sa karabelo.
Ho eketsoa ha Ethylene Oxide (EO): Ethylene oxide (EO) e kenngoa butle-butle ho sejana sa karabelo ha e ntse e boloka mocheso le ho sisinyeha ho sa khaotse. Karabelo ea eona ke exothermic, kahoo ho laola mocheso ho bohlokoa ho thibela mocheso o feteletseng.
Tlhokomelo ea Boitšoaro: Tsoelo-pele ea karabelo e shejoa ka ho hlahloba lisampole nako le nako. Mekhoa e kang Fourier-transform infrared spectroscopy (FTIR) e ka sebelisoa ho fumana tekanyo ea ho fetola (DS) ea lihlopha tsa hydroxyethyl mokokotlong oa cellulose.
Ho Neutralization le Ho Hlatsoa: Hang ha DS e lakatsehang e fihletsoe, karabelo e tima ka ho fokotsa motsoako oa alkaline ka asiti, eo hangata e leng acetic acid. HEC e hlahisoang e hlatsuoa hantle ka metsi ho tlosa li-reagents le litšila tse sa sebetseng.
3. Tlhoekiso le ho Omisa
HEC e hlatsoitsoeng e hloekisoa hape ka ho hloekisa kapa centrifugation ho tlosa litšila leha e le life tse setseng. HEC e hloekisitsoeng e ntan'o omisoa ho mongobo o itseng ho fumana sehlahisoa sa ho qetela.
Taolo ea Boleng
Taolo ea boleng ke ea bohlokoa ho pholletsa le ts'ebetso ea tlhahiso ea HEC ho netefatsa ho tsitsa le ho hloeka ha sehlahisoa sa ho qetela. Li-parameter tsa bohlokoa li kenyelletsa:
Degree of substitution (DS)
Viscosity
Mongobo
pH
Bohloeki (ho se be teng ha litšila)
Mekhoa ea ho sekaseka joalo ka FTIR, litekanyo tsa viscosity, le tlhahlobo ea mantlha li sebelisoa hangata bakeng sa taolo ea boleng.
Lisebelisoa tsa Hydroxyethyl Cellulose (HEC)
HEC e fumana lits'ebetso liindastering tse fapaneng ka lebaka la thepa ea eona e fapaneng:
Meriana ea Meriana: E sebelisoa e le ntho e matlafatsang ho emisoa ka molomo, ho etsoa ha lihlooho, le mekhoa e laoloang ea ho fana ka lithethefatsi.
Litlolo: Hangata li sebelisoa litlolong, litlolo, le li-shampoo e le sekontiri le se matlafatsang.
Lijo: E eketsoa ho lihlahisoa tsa lijo e le ntho e matlafatsang le ea gelling, emulsifier, le stabilizer.
Kaho: E sebelisoa liretseng tse thehiloeng ho samente le li-grouts ho ntlafatsa ts'ebetso le ho boloka metsi.
Mehopolo ea Tikoloho le Polokeho
Tšusumetso ea Tikoloho: Tlhahiso ea HEC e kenyelletsa tšebeliso ea lik'hemik'hale tse kang ethylene oxide le alkalis, tse ka bang le liphello tsa tikoloho. Taolo e nepahetseng ea litšila le ho latela melaoana li bohlokoa ho fokotsa tšusumetso ea tikoloho.
Tšireletseho: Ethylene oxide ke khase e sebetsang haholo le e tukang, e behang likotsi tsa polokeho nakong ea ts'ebetso le polokelo. Ho na le moea o lekaneng, lisebelisoa tsa ho itšireletsa (PPE) le liprothokholo tsa polokeho lia hlokahala ho netefatsa polokeho ea basebetsi.
Hydroxyethyl cellulose (HEC) ke polima ea bohlokoa e nang le lits'ebetso tse fapaneng liindastering ho tloha ho tsa meriana ho isa ho tsa kaho. Tlhahiso ea eona e kenyelletsa etherification ea cellulose ka ethylene oxide tlas'a maemo a alkaline. Mehato ea taolo ea boleng e bohlokoa ho netefatsa botsitso le bohloeki ba sehlahisoa sa ho qetela. Mehopolo ea tikoloho le polokeho le eona e tlameha ho shejoa ts'ebetsong eohle ea tlhahiso. Ka ho latela mekhoa le mekhoa e nepahetseng, HEC e ka hlahisoa ka katleho ha e ntse e fokotsa tšusumetso ea tikoloho le ho netefatsa polokeho ea basebetsi.
Tataiso ena e felletseng e akaretsa ts'ebetso ea tlhahiso ea hydroxyethyl cellulose (HEC) ka botlalo, ho tloha ho lisebelisoa tse tala ho isa taolong ea boleng le lits'ebetso, ho fana ka kutloisiso e phethahetseng ea ts'ebetso ea tlhahiso ea polymer ena ea bohlokoa.
Nako ea poso: Apr-10-2024