Hydroxyethyl Methyl Cellulose (HEMC)ke motsoako oa bohlokoa oa cellulose ether mme ke oa non-ionic cellulose ether. HEMC e fumanoa ka phetoho ea lik'hemik'hale ka cellulose ea tlhaho e le lisebelisoa tse tala. Sebopeho sa eona se na le li-substituents tsa hydroxyethyl le methyl, kahoo e na le thepa e ikhethang ea 'mele le ea lik'hemik'hale' me e sebelisoa haholo ka thepa ea mohaho, liphahlo, lik'hemik'hale tsa letsatsi le letsatsi, meriana le masimo a mang.
1. Lintho tsa 'mele le tsa lik'hemik'hale
HEMC hangata ke phofo e tšoeu kapa e bosoeu kapa granules, e qhibilihang habonolo metsing a batang ho etsa tharollo ea colloidal e hlakileng kapa e nyenyane. Litšobotsi tsa eona tse ka sehloohong li kenyelletsa:
Solubility: HEMC e ka qhibiliha ka potlako metsing a batang, empa ha e na ho qhibiliha ha metsi a chesang. Sollubility le viscosity ea eona e fetoha ka liphetoho mochesong le boleng ba pH.
Phello e matla: HEMC e na le matla a matla a ho thibela metsi 'me e ka eketsa ka katleho viscosity ea tharollo.
Ho boloka metsi: E na le ts'ebetso e ntle ea ho boloka metsi 'me e ka thibela tahlehelo ea metsi ka thepa.
Thepa ea ho etsa lifilimi: HEMC e ka etsa filimi e ts'oanang e hlakileng holim'a metsi ka thata le matla a itseng.
Lubricity: Ka lebaka la sebopeho sa eona se ikhethang sa limolek'hule, HEMC e ka fana ka lubrication e ntle haholo.
2. Mokhoa oa tlhahiso
Ts'ebetso ea tlhahiso ea HEMC haholo-holo e kenyelletsa mehato e latelang:
Alkalization: Selulose ea tlhaho e phekoloa tlas'a maemo a alkaline ho etsa alkali cellulose.
Etherification reaction: Ka ho eketsa li-methylating agents (tse kang methyl chloride) le hydroxyethylating agents (tse kang ethylene oxide), cellulose e ba le etherification reaction ka mocheso o itseng le khatello.
Ka mor'a Kalafo: Sehlahisoa se hlahisoang ha se na thuso, se hlatsuoa, se omisitsoe, 'me se siloa hore qetellong se fumanehe.HEMClihlahisoa.
3. Libaka tsa kopo tse ka sehloohong
(1) Thepa ea mohaho HEMC e sebelisoa haholo tšimong ea kaho, haholo-holo ka seretse sa samente, putty powder, sekhomaretsi sa lithaele, gypsum le lihlahisoa tse ling. E ka ntlafatsa viscosity, ho boloka metsi le thepa e khahlanong le ho senyeha ha thepa ea kaho, ea lelefatsa nako e bulehileng, 'me kahoo ea ntlafatsa ts'ebetso ea kaho.
(2) Lipente le li-inks Ka lipente, HEMC e sebetsa e le motenya le emulsifier stabilizer ho ntlafatsa viscosity le rheology ea pente le ho thibela ho roala ha letlalo. Ho phaella moo, e ka fana ka thepa e ntle ea ho etsa filimi, ho etsa hore holim'a pente e be e ts'oanang le e boreleli.
(3) Meriana le litlolo HEMC e ka sebelisoa e le sekhomaretsi le se etsang filimi matlapeng a meriana, hammoho le ho teteaneng le moisturizer lihlahisoa tsa tlhokomelo ea letlalo. Ka lebaka la polokeho ea eona e phahameng le biocompatibility, hangata e sebelisoa lihlahisoa tse kang marotholi a mahlo, lihloekisi tsa sefahleho le litlolo.
(4) Lik'hemik'hale tsa letsatsi le letsatsi Ka lik'hemik'hale tsa letsatsi le letsatsi tse kang li-detergents le menoana ea meno, HEMC e sebelisoa e le motenya le stabilizer ho matlafatsa rheology le botsitso ba sehlahisoa.
4. Melemo le tšireletso ea tikoloho
HEMC e na le boleng bo phahameng ba biodegradability le ts'ireletso ea tikoloho 'me e ke ke ea baka tšilafalo ea nako e telele tikolohong. Ka nako e ts'oanang, ha e na chefo ebile ha e na kotsi, ha e halefise letlalo la motho le lera la mucous, 'me e finyella litlhoko tsa ts'ireletso ea tikoloho e tala le tsoelo-pele e tsitsitseng.
5. Litebello tsa 'maraka le mekhoa ea ntlafatso
Ka nts'etsopele ea indasteri ea kaho le indasteri ea lik'hemik'hale tsa letsatsi le letsatsi, tlhoko ea 'maraka ea HEMC e ntse e hola. Nakong e tlang, ha batho ba ntse ba ela hloko lisebelisoa tse se nang tikoloho le ho ntlafatsa ts'ebetso ea sehlahisoa, HEMC e tla sebelisoa haholo mafapheng a fapaneng. Ho phaella moo, lipatlisiso le nts'etsopele ea lihlahisoa tse ncha tse sebetsang tsa HEMC (tse kang mocheso o phahameng oa mocheso le mofuta oa hang-hang) li tla boela li khothalletse ts'ebeliso ea eona 'marakeng oa maemo a holimo.
Joalo ka selulose ether e sebetsang ka bongata le e sebetsang hantle haholo,hydroxyethyl methylcellulose (HEMC)e phetha karolo ea bohlokoa kahong, ho roala, meriana le masimo a mang ka thepa ea eona e ikhethang ea 'mele le lik'hemik'hale. Ka tsoelopele ea saense le thekenoloji le katoloso ea mafapha a likopo, HEMC e tla bapala karolo ea bohlokoa ho feta indastering ea sejoale-joale le ho fana ka tšehetso e matla bakeng sa nts'etsopele ea liindasteri tse amanang le tsona.
Nako ea poso: Nov-11-2024