Lihlahisoa tsa samente, tse kang konkreite, seretse le lisebelisoa tse ling tsa mohaho, li sebelisoa haholo mehahong ea kajeno. Li-cellulose ethers (tse kang hydroxypropyl methylcellulose (HPMC), hydroxyethyl methylcellulose (HEMC), joalo-joalo) ke lisebelisoa tsa bohlokoa tse ka ntlafatsang haholo ts'ebetso ea lihlahisoa tsa samente. E le ho finyella thepa ena e babatsehang, ke habohlokoa ho tseba le ho laola ts'ebetso ea cellulose ethers.
1. Lintho tsa motheo le mesebetsi ea cellulose ethers
Li-cellulose ethers ke sehlopha sa lihlahisoa tsa lik'hemik'hale tsa selulose ea tlhaho, moo sehlopha sa hydroxyl se nkeloang sebaka ke sehlopha sa ether ka karabelo ea etherification. Mefuta e fapaneng ea li-cellulose ethers e ka etsoa ho latela mofuta le palo ea li-substitute, 'me mofuta o mong le o mong o na le karolo e fapaneng lihlahisoa tsa samente.
Viscosity ea cellulose ethers:
Viscosity ea cellulose ethers e ama ka ho toba rheology le botsitso ba peista ea samente. Li-high-viscosity cellulose ethers li ka ntlafatsa ho boloka metsi le matla a tlamahano a peista, empa li ka fokotsa metsi a eona. Li-cellulose ethers tse nang le viscosity e tlase li thusa ho ntlafatsa ts'ebetso le ho phalla ha metsi.
Degree of substitution (DS) le molar substitution (MS):
Tekanyo ea ho nkela sebaka le molar substitution ea cellulose ethers e etsa qeto ea ho qhibiliha ha eona le viscosity ea tharollo. Boemo bo phahameng ba ho nkela sebaka le sebaka se phahameng sa molar hangata se ka ntlafatsa ho bolokoa ha metsi le botsitso ba li-cellulose ethers.
Ho qhibiliha ha cellulose ethers:
Sekhahla sa ho qhibiliha le ho qhibiliha ha li-cellulose ethers li ama ho tšoana ha pente ea samente. Li-cellulose ethers tse nang le solubility e ntle li ka etsa tharollo e ts'oanang ka potlako, ka hona ho netefatsa ho ts'oana le botsitso ba pente.
2. Khetha li-ether tsa cellulose tse loketseng
Maemo a fapaneng a ts'ebeliso a na le litlhoko tse fapaneng tsa ts'ebetso bakeng sa li-cellulose ethers. Ho khetha mofuta o nepahetseng le litlhaloso tsa cellulose ether ho ka ntlafatsa haholo ts'ebetso ea lihlahisoa tsa samente:
Likopano:
Lits'ebetsong tse kang likhomaretsi tsa lithaele le li-plaster seretse, li-high-viscosity cellulose ethers (tse kang HPMC) li ka fana ka ho khomarela hantle le ho koloba ka nako e telele, ka hona ho ntlafatsa ts'ebetso ea kaho le matla a ho qetela a tlamahano.
Lisebelisoa tsa ho boloka metsi:
Litšeng tse ikemetseng le li-adhesives tse entsoeng ka samente, li-cellulose ethers tse nang le metsi a mangata (joaloka HEMC) lia hlokahala. Ho boloka metsi a phahameng ho thusa ho thibela tahlehelo ea metsi pele ho nako, ka hona ho netefatsa karabelo e lekaneng ea hydration le nako e telele ea ts'ebetso.
Lisebelisoa tsa ho matlafatsa:
Li-cellulose ethers tse sebelisoang ho matlafatsa matla a lihlahisoa tsa samente li hloka ho ba le dispersibility tse ntle le viscosity e itekanetseng ho matlafatsa ho tšoana le matla a matrix.
3. Ntlafatsa mokhoa oa ho eketsa
Ho laola mokhoa oa ho eketsa cellulose ether lihlahisoa tsa samente ho bohlokoa ho eketsa katleho ea eona. Tse latelang ke mekhoa e mengata e tloaelehileng ea optimization:
Mokhoa oa Premixing:
Kopanya cellulose ether le lisebelisoa tse ling tse omeletseng esale pele. Mokhoa ona o ka qoba ho thehoa ha agglomeration ea cellulose ether ka mor'a ho kopana ka ho toba le metsi, ka tsela eo ho etsa bonnete ba ho hasana ha eona ka junifomo ka slurry.
Mokhoa oa ho kopanya metsi:
Eketsa cellulose ether ho slurry ea samente butle-butle. Mokhoa ona o loketse boemo boo cellulose ether e qhibilihang ka potlako 'me e thusa ho theha ho emisoa ho tsitsitseng.
Mokhoa oa ho eketsa likarolo:
Ha u ntse u lokisetsa slurry ea samente, ho eketsa cellulose ether ka likarolo ho ka etsa bonnete ba kabo ea eona e ts'oanang ho pholletsa le ts'ebetso ea ho lokisetsa le ho fokotsa agglomeration.
4. Laola lintho tse ka ntle
Lintlha tsa kantle tse kang mocheso, pH ea boleng, le sekhahla se susumetsang li na le tšusumetso e kholo ts'ebetsong ea cellulose ether.
Taolo ea mocheso:
The solubility le viscosity ea selulose ether e hlokolosi haholo mocheso. Lithempereichara tse phahameng li thusa cellulose ether ho qhibiliha kapele, empa hape e ka etsa hore viscosity ea tharollo e fokotsehe. Thempereichara e lokela ho fetoloa ho latela maemo a ts'ebeliso e khethehileng ho netefatsa ts'ebetso le ts'ebetso e nepahetseng.
Phetoho ea pH: Boleng ba pH ba peista ea samente hangata bo maemong a holimo a alkaline, ha ho qhibiliha le viscosity ea cellulose ether e feto-fetoha le phetoho ea boleng ba pH. Ho laola boleng ba pH ka har'a mefuta e nepahetseng ho ka tsitsisa ts'ebetso ea cellulose ether.
Sekhahla sa ho sisinyeha: Sekhahla se susumetsang se ama phello ea ho hasana ha cellulose ether ka har'a peista ea samente. Sekhahla sa ho sisinyeha se phahameng haholo se ka lebisa ho kenyelletsoeng ha moea le ho kopanngoa ha cellulose ether, ha sekhahla sa ho sisinyeha se itekanetseng se thusa ho aba le ho qhala cellulose ether.
5. Tlhahlobo ea linyeoe le litlhahiso tse sebetsang
Ka tlhahlobo ea linyeoe tsa 'nete, re ka utloisisa haholoanyane ts'ebeliso le leano la ho ntlafatsa cellulose ether lihlahisoa tse fapaneng tsa samente:
Sekhomaretsi sa lithaele se sebetsang hantle: Ha k'hamphani e ntse e hlahisa sekhomaretsi sa lithaele se phahameng, ho ile ha fumanoa hore ho boloka metsi a sehlahisoa sa pele ho ne ho sa lekana, ho fella ka ho fokotseha ha matla a ho kopanya ka mor'a ho hahoa. Ka ho hlahisa HEMC e nang le metsi a mangata le ho lokisa palo ea eona ea ho eketsa le mokhoa oa ho eketsa (ho sebelisa mokhoa oa premixing), ho boloka metsi le matla a ho kopanya a sekhomaretsi sa lithaele li ile tsa ntlafatsoa ka katleho.
Thepa e ikemetseng ea fatše: Thepa e ikemetseng e sebelisoang morerong o itseng e ne e e-na le metsi a fokolang le ho fokola ha bokaholimo ka mor'a ho hahoa. Ka ho khetha HPMC e nang le viscosity e tlase le ho ntlafatsa sekhahla se susumetsang le taolo ea mocheso, ho sebetsa ha metsi le kaho ea slurry ho ntlafatsoa, ho etsa hore sebaka sa ho qetela sa fatše se be bonolo.
Ho laola ts'ebetso ea cellulose ether lihlahisoa tsa samente ke senotlolo sa ho ntlafatsa ts'ebetso ea thepa le boleng ba kaho. Ka ho khetha mofuta o nepahetseng oa cellulose ether, ho ntlafatsa mokhoa oa ho eketsa, le ho laola lintlha tse susumetsang ka ntle, thepa ea bohlokoa ea lihlahisoa tsa samente tse kang ho boloka metsi, ho khomarela le ho phalla ha metsi ho ka ntlafatsoa haholo. Lits'ebetsong tse sebetsang, hoa hlokahala ho tsoela pele ho ntlafatsa le ho lokisa ts'ebeliso ea cellulose ether ho latela litlhoko tse ikhethileng le maemo a ts'ebeliso ho fihlela litholoana tse ntle.
Nako ea poso: Jun-26-2024