Methylcellulose (MC) ke ntho e tloaelehileng ea polymer e entsoeng ka lik'hemik'hale, e fetotsoeng ea cellulose ether e fumanoang ke methylating selulose ea tlhaho. Ka lebaka la thepa ea eona e khethehileng ea 'mele le lik'hemik'hale, e sebelisoa haholo ho haha, lijo, meriana, litlolo, pampiri le liaparo.
1. Ho hlophisoa ka tekanyo ea ho kenya sebaka
The degree of substitution (DS) e bolela boleng ba karolelano ea lihlopha tsa hydroxyl tse nkeloang sebaka ke lihlopha tsa methyl yuniti e 'ngoe le e 'ngoe ea tsoekere ho methylcellulose. Ho na le lihlopha tse 3 tsa hydroxyl reng e 'ngoe le e 'ngoe ea tsoekere ea molek'hule ea cellulose e ka nkeloang sebaka ke lihlopha tsa methyl. Ka hona, tekanyo ea ho fetola methylcellulose e ka fapana ho tloha ho 0 ho ea ho 3. Ho ea ka tekanyo ea ho fetola, methylcellulose e ka aroloa ka mekhahlelo e 'meli: tekanyo e phahameng ea ho fetola le tekanyo e tlaase ea ho fetola.
Tekanyo e phahameng ea substitution methylcellulose (DS> 1.5): Mofuta ona oa sehlahisoa o na le tekanyo e phahameng ea methyl substitution, kahoo e na le hydrophobic, e na le ho qhibiliha ho tlaase le ho thibela metsi hantle. Hangata e sebelisoa ka thepa ea mohaho, liphahlo le liketsahalo tse ling tse hlokang tekanyo e itseng ea hydrophobicity.
Tekanyo e tlase ea substitution methylcellulose (DS <1.5): Ka lebaka la sebaka se fokolang sa methyl, mofuta ona oa sehlahisoa o na le hydrophilic, o na le ho qhibiliha ho molemo 'me o ka qhibiliha metsing a batang. Methylcellulose e nkeloang sebaka e tlase e sebelisoa haholo indastering ea lijo le ea meriana e le motenya, emulsifier le stabilizer.
2. Ho arola ka tšebeliso
Ho latela ts'ebeliso ea methylcellulose mafapheng a fapaneng, e ka aroloa ka mekhahlelo e 'meli: methylcellulose ea indasteri le lijo le methylcellulose ea meriana.
Industrial methylcellulose: Haholo-holo e sebelisoa kahong, ho roala, ho etsa pampiri, li-ceramics le liindasteri tse ling e le sekontiri, sekhomaretsi, filimi ea pele, moemeli oa ho boloka metsi, joalo-joalo indastering ea kaho, methylcellulose e sebelisoa ka samente le lihlahisoa tsa gypsum ho ntlafatsa ts'ebetso ea kaho. durability; indastering ea ho roala, methylcellulose e ka eketsa botsitso le dispersibility ea liphahlo.
Methilcellulose ea lijo le meriana: Ka lebaka la thepa ea eona e se nang chefo le e se nang kotsi, methylcellulose e sebelisoa e le tlatsetso lijong le meriana. Lijong, methylcellulose ke "thickener" e tloaelehileng le emulsifier e khonang ho tsitsisa sebopeho sa lijo le ho thibela stratification kapa karohano; lefapheng la meriana, methylcellulose e ka sebelisoa e le khetla ea capsule, e tsamaisang lithethefatsi, hape e na le mosebetsi oa lithethefatsi tse tsoelang pele. Ho ja le ho sireletseha ha eona ho etsa hore methylcellulose e ratoe haholo libakeng tsena tse peli.
3. Classification ka solubility
Methylcellulose e arotsoe haholo ka mekhahlelo e 'meli ho latela ho qhibiliha: mofuta oa metsi a batang a qhibilihang le mofuta oa manyolo o qhibilihang.
Methilcellulose e qhibilihang ka metsi a batang: Mofuta ona oa methylcellulose o ka qhibiliha ka metsing a batang ho etsa tharollo e hlakileng, e hlakileng ka mor'a ho qhibiliha. Hangata e sebelisoa indastering ea lijo le ea meriana e le motenya kapa filimi ea pele. Ho qhibiliha ha mofuta ona oa methylcellulose ho fokotseha ka mocheso o ntseng o eketseha, kahoo tšobotsi ena e ka sebelisoa bakeng sa taolo ea kaho ha e sebelisoa indastering ea kaho.
Organic solvent soluble methylcellulose: Mofuta ona oa methylcellulose o ka qhibiliha ka har'a li-solvents 'me hangata o sebelisoa lipenteng, liphahlo le masimo a mang a indasteri a hlokang mecha ea litaba ea organic phase. Ka lebaka la thepa ea eona e ntle ea ho etsa lifilimi le khanyetso ea lik'hemik'hale, e loketse ho sebelisoa tlas'a maemo a thata a indasteri.
4. Ho khetholla ka boima ba molek'hule (viscosity)
Boima ba molek'hule ba methylcellulose bo na le phello e kholo linthong tsa eona tsa 'mele, haholo-holo ts'ebetso ea viscosity ka tharollo. Ho latela boima ba limolek'hule, methylcellulose e ka aroloa ka mofuta o tlase oa viscosity le mofuta o phahameng oa viscosity.
Low viscosity methylcellulose: Boima ba limolek'hule bo batla bo le nyane 'me viscosity ea tharollo e tlase. Hangata e sebelisoa lijong, meriana le litlolo, haholo-holo bakeng sa emulsification, ho emisoa le ho teteaneng. Low-viscosity methylcellulose e ka boloka metsi a matle le ho tšoana, 'me e loketse likopo tse hlokang tharollo ea viscosity e tlaase.
High-viscosity methylcellulose: E na le boima bo boholo ba molek'hule 'me e etsa tharollo e phahameng ea viscosity ka mor'a ho qhibiliha. Hangata e sebelisoa ka thepa ea mohaho, liphahlo le li-adhesive tsa indasteri. High-viscosity methylcellulose e ka eketsa ka katleho matla a mochine, ho apara ho hanyetsa le ho khomarela tharollo, kahoo e sebelisoa haholo ka thepa e hlokang matla a phahameng le ho hanyetsa ho apara ho phahameng.
5. Ho hlophisoa ka tekanyo ea phetoho ea lik'hemik'hale
Methylcellulose ke motsoako oa selulose o fetotsoeng ka lik'hemik'hale. Ho latela mokhoa oa phetoho le degree, e ka aroloa ka selulose e le 'ngoe ea methyl le selulose e fetotsoeng e kopantsoeng.
Single methyl cellulose: e bua ka cellulose ethers tse nkeloang sebaka ke methyl feela. Sehlahisoa sa mofuta ona se na le thepa e batlang e tsitsitse ea 'mele le ea lik'hemik'hale,' me thepa ea eona ea ho qhibiliha, e teteaneng le ea ho etsa lifilimi e batla e le ntle.
Composite modified cellulose: Ho phaella ho methylation, e tsoela pele ho phekoloa ka lik'hemik'hale, tse kang hydroxypropylation, ethylation, joalo-joalo, ho theha sehlahisoa se fetotsoeng se kopantsoeng. Ka mohlala, hydroxypropyl methylcellulose (HPMC) le carboxymethyl cellulose (CMC). Li-cellulose tse fetotsoeng tse entsoeng ka motsoako hangata li na le ho qhibiliha ha metsi hantle, ho hanyetsa mocheso le botsitso, 'me li ka ikamahanya le mefuta e mengata ea litlhoko tsa indasteri.
6. Classification ka indasteri ea kopo
Tšebeliso e pharaletseng ea methylcellulose e lumella hore e aroloe ho latela litšobotsi tsa eona tsa kopo liindastering tse fapaneng.
Methylcellulose ea indasteri ea kaho: E sebelisoa haholo linthong tse thehiloeng ho samente le tsa gypsum joalo ka mokelikeli oa metsi le motenya. E ka ntlafatsa ts'ebetso ea lisebelisoa tsa mohaho, ea thibela tahlehelo ea metsi pele ho nako, 'me ea eketsa matla a mochine oa lihlahisoa tse felileng.
Indasteri ea lijo methylcellulose: E le emulsifier, thickener le stabilizer ts'ebetsong ea lijo. E ka thibela tahlehelo ea metsi, ea ntlafatsa tatso le sebopeho sa lijo, 'me ea eketsa bophelo ba sethala sa lijo.
Indasteri ea meriana methylcellulose: Joalo ka setlamo sa letlapa kapa ntho e sa khaotseng ea ho lokoloha bakeng sa lithethefatsi. Methylcellulose e ka boela ea sebelisoa ha ho lokisoa lithethefatsi tsa ka mpeng e le sesebelisoa se sireletsehileng le se sebetsang sa lithethefatsi.
Indasteri ea litlolo ea methylcellulose: Lihlahisoang tsa tlhokomelo ea letlalo le litlolo, methylcellulose e sebelisoa e le motenya, emulsifier le moisturizer ho thusa lihlahisoa ho etsa sebopeho se bonolo le se boreleli ha se ntse se lelefatsa phello ea mongobo.
Ka kakaretso, ho na le mekhoa e mengata ea ho arola methylcellulose, e ka khetholloang ho ea ka litšobotsi tsa eona tsa sebopeho sa lik'hemik'hale, kapa ho ea ka likarolo tsa eona tsa kopo le thepa ea ho qhibiliha. Mekhoa ena e fapaneng ea ho arola e re thusa ho utloisisa hamolemo litšobotsi le mesebetsi ea methylcellulose, hape e fana ka motheo oa khopolo-taba bakeng sa ts'ebeliso ea eona mafapheng a fapaneng.
Nako ea poso: Oct-23-2024