Li-cellulose ethers ke mefuta e fapaneng ea li-polymers tse qhibilihang ka metsing tse tsoang ho selulose, polima ea tlhaho e fumanehang maboteng a lisele tsa semela.Li-ether tsena li na le thepa e ikhethang e kang ho teteka, ho tsitsisa, ho etsa lifilimi, le ho boloka metsi, 'me li sebelisoa haholo liindastering tse sa tšoaneng tse kang meriana, lijo, litlolo le kaho.Har'a li-cellulose ethers, hydroxyethyl cellulose (HEC) le hydroxypropyl methylcellulose (HPMC) ke lintho tse peli tsa bohlokoa tse nkiloeng, e 'ngoe le e' ngoe e na le thepa le lisebelisoa tse fapaneng.
1. Kenyelletso ea li-cellulose ethers
A. Sebopeho sa Cellulose le Litlhahiso
Kakaretso ea cellulose:
Cellulose ke polymer e nang le linear e entsoeng ka likaroloana tsa tsoekere tse hokahantsoeng ke libonto tsa β-1,4-glycosidic.
E ruile ka marako a lisele tsa limela 'me e fana ka ts'ehetso ea sebopeho le ho tiea ho limela tsa limela.
Lintho tse tsoang ho cellulose ether:
Li-cellulose ethers li tsoa ho selulose ka phetoho ea lik'hemik'hale.
Li-Ether li hlahisoa ho eketsa solubility le ho fetola thepa ea ts'ebetso.
2. Hydroxyethylcellulose (HEC)
A. Sebopeho le motsoako
Sebopeho sa lik'hemik'hale:
HEC e fumanoa ka etherification ea cellulose e nang le ethylene oxide.
Lihlopha tsa Hydroxyethyl li nka sebaka sa lihlopha tsa hydroxyl ka sebopeho sa cellulose.
Degree of substitution (DS):
DS e bolela palo e tloaelehileng ea lihlopha tsa hydroxyethyl ka unit ea anhydroglucose.
E ama solubility, viscosity le thepa e meng ea HEC.
B. Tlhaho
Sollubility:
HEC e qhibiliha ka metsing a batang le a chesang, e fana ka phetoho ea kopo.
Viscosity:
Joaloka rheology modifier, e ama botenya le phallo ea tharollo.
E fapana ho ea ka DS, mahloriso le mocheso.
Moetso oa lifilimi:
E etsa filimi e hlakileng e nang le sekhomaretsi se setle haholo.
C. Kopo
lithethefatsi:
E sebelisoa e le motenya ka mefuta ea litekanyetso tsa metsi.
Ntlafatsa viscosity le botsitso ba marotholi a mahlo.
Lipente le Liaparo:
E ntlafatsa viscosity mme e fana ka thepa e ntle haholo ea botenya.
Ntlafatsa ho khomarela pente le botsitso.
Lihlahisoa tsa tlhokomelo ea motho ka mong:
E fumaneha ka har'a li-shampoo, litlolo le litlolo e le setepi le se tsitsitseng.
E fana ka sebopeho se boreleli ho litlolo.
3. Hydroxypropylmethylcellulose (HPMC)
A. Sebopeho le motsoako
Sebopeho sa lik'hemik'hale:
HPMC e entsoe ka ho fetola lihlopha tsa hydroxyl ka lihlopha tsa methoxy le hydroxypropyl.
Etherification e etsahala ka karabelo ea propylene oxide le methyl chloride.
Methoxy le hydroxypropyl:
Sehlopha sa methoxy se kenya letsoho ho solubility, ha sehlopha sa hydroxypropyl se ama viscosity.
B. Tlhaho
Thermal gelation:
E bonts'a gelation e fetohang ea mocheso, e etsa li-gel ka mocheso o phahameng.
E ka sebelisoa bakeng sa litokisetso tsa meriana tse laoloang.
Ho boloka metsi:
Bokhoni bo botle ba ho boloka metsi, bo etsang hore bo lokele lits'ebetso tsa kaho.
Ts'ebetso ea bokaholimo:
E bonts'a lintho tse kang surfactant ho thusa ho tsitsisa li-emulsion.
C. Kopo
Indasteri ea kaho:
E sebelisoa joalo ka se bolokang metsi seretseng se entsoeng ka samente.
E ntlafatsa ho sebetsa le ho khomarela li-adhesive tsa lithaele.
lithethefatsi:
E sebelisoa ka tloaelo ho litokisetso tsa meriana ea molomo le ea lihlooho.
E thusa ho lokolloa ha lithethefatsi tse laoloang ka lebaka la bokhoni ba eona ba ho etsa li-gel.
indasteri ea lijo:
E sebetsa joalo ka motenya le ho tsitsisa lijong.
E fana ka sebopeho se ntlafalitsoeng le molomo lits'ebetsong tse itseng.
4. Tlhahlobo ea papiso
A. Phapang ka ho kopanya
HEC le HPMC synthesis:
HEC e hlahisoa ka ho arabela selulose ka ethylene oxide.
HPMC synthesis e kenyelletsa phetisetso e habeli ea lihlopha tsa methoxy le hydroxypropyl.
B. Liphapang tsa tšebetso
Solubility le Viscosity:
HEC e qhibiliha metsing a batang le a chesang, ha ho qhibiliha ha HPMC ho angoa ke litaba tsa sehlopha sa methoxy.
HEC ka kakaretso e bonts'a viscosity e tlase ha e bapisoa le HPMC.
Boitšoaro ba li-gel:
Ho fapana le HPMC, e etsang li-gel tse fetolehang, HEC ha e kene ka mocheso oa mocheso.
C. Liphapang tsa tšebeliso
Ho boloka metsi:
HPMC e ratoa bakeng sa lits'ebetso tsa kaho ka lebaka la thepa ea eona e ntle ea ho boloka metsi.
Bokhoni ba ho etsa lifilimi:
HEC e etsa lifilimi tse hlakileng ka ho khomarela hantle, ho etsa hore e tšoanelehe bakeng sa likopo tse itseng moo ho thehoa ha filimi ho leng bohlokoa.
5 Qetello
Ka bokhutšoanyane, hydroxyethyl cellulose (HEC) le hydroxypropyl methylcellulose (HPMC) ke li-cellulose ethers tsa bohlokoa tse nang le thepa le lisebelisoa tse ikhethang.Mehaho ea bona e ikhethang ea lik'hemik'hale, mekhoa ea ho kopanya, le thepa ea ts'ebetso e etsa hore li sebetse ka mokhoa o fapaneng liindastering tse fapaneng.Ho utloisisa phapang pakeng tsa HEC le HPMC ho ka u thusa ho etsa qeto e nang le tsebo ha u khetha ether ea cellulose e nepahetseng bakeng sa kopo e itseng, ebang ke meriana, kaho, lipente kapa lihlahisoa tsa tlhokomelo ea botho.Ha thekenoloji e ntse e tsoela pele ka saense, lipatlisiso tse ling li ka senola lits'ebetso le liphetoho tse ngata, ka hona tsa ntlafatsa ts'ebeliso ea li-cellulose ethers tsena mafapheng a fapaneng.
Nako ea poso: Dec-11-2023