Cellulose ke polymer ea tlhaho e ngata ka ho fetisisa tlhahong. Ke motsoako oa polymer o nang le mela o kopantsoeng ke D-glucose ka li-bond tsa β-(1-4) tsa glycosidic. Tekanyo ea polymerization ea cellulose e ka fihla ho 18,000, 'me boima ba limolek'hule bo ka fihla ho limilione tse' maloa.
Cellulose e ka hlahisoa ka makhasi a lehong kapa k'hothone, eo ka boeona e sa qhibiliheng ka metsing, empa e matlafatsoa ka alkali, e etherified ka methylene chloride le propylene oxide, e hlatsuoa ka metsi, 'me e omisitsoe ho fumana methyl cellulose e qhibilihang ka metsing (MC) le hydroxypropyl methylcellulose (HPMC), ke hore, methoxy le hydroxypropoxy li sebelisoa ho nkela lihlopha tsa hydroxyl sebakeng sa C2, C3 le C6 ea glucose ho etsa li-nonionic cellulose ethers.
Methyl cellulose ke phofo e ntle e sa nkhang hamonate, e tšoeu ho isa ho tranelate e tšoeu, 'me pH ea tharollo e pakeng tsa 5-8.
Likahare tsa methoxyl tsa methylcellulose tse sebelisoang e le tlatsetso ea lijo hangata li pakeng tsa 25% le 33%, tekanyo e tsamaellanang ea substitution ke 17-2.2, 'me tekanyo ea theory ea ho fetola e pakeng tsa 0-3.
Joalo ka tlatsetso ea lijo, litaba tsa methoxyl tsa hydroxypropyl methylcellulose hangata li pakeng tsa 19% le 30%, mme litaba tsa hydroxypropoxyl hangata li pakeng tsa 3% le 12%.
Litšobotsi tsa ts'ebetso
gel ea thermoreversible
Methylcellulose/Hydroxypropylmethylcellulose e na le thepa ea gelling ea thermoreversible.
Methyl cellulose/hydroxypropyl methyl cellulose e tlameha ho qhibiliha ka metsing a batang kapa metsing a tloaelehileng a mocheso. Ha tharollo ea metsi e futhumala, viscosity e tla tsoela pele ho fokotseha, 'me gelation e tla etsahala ha e fihla mocheso o itseng. Ka nako ena, methyl cellulose/hydroxypropyl methyl cellulose Tharollo e bonaletsang ea propyl methylcellulose e ile ea qala ho fetoha bosoeu ba lebese le opaque, mme viscosity e bonahalang e ile ea eketseha ka potlako.
Thempereichara ena e bitsoa thermal gel initiation mocheso. Ha gel e pholile, viscosity e bonahalang e theoha ka potlako. Qetellong, sekhahla sa viscosity ha pholileng se lumellana le sekhahla sa pele sa ho futhumatsa viscosity, gel e fetoha tharollo, tharollo e fetoha gel ha e futhumetse, 'me mokhoa oa ho khutlela tharollo ka mor'a hore o pholisoe o fetohe hape o phetoa.
Hydroxypropyl methylcellulose e na le mocheso o phahameng oa mocheso oa gelation ho feta methylcellulose le matla a tlaase a gel.
Ptshebetso
1. Lintho tsa ho etsa lifilimi
Lifilimi tse entsoeng ke methylcellulose / hydroxypropylmethylcellulose kapa lifilimi tse nang le bobeli li ka thibela ka katleho ho falla ha oli le ho lahleheloa ke metsi, kahoo ho tiisa botsitso ba sebopeho sa lijo.
2. Emulsifying thepa
Methylcellulose/Hydroxypropylmethylcellulose e ka fokotsa tsitsipano ea holim'a metsi le ho fokotsa ho bokellana ha mafura bakeng sa botsitso bo betere ba emulsion.
3. Taolo ea tahlehelo ea metsi
Methylcellulose/Hydroxypropylmethylcellulose e ka laola ka nepo ho falla ha mongobo oa lijo ho tloha serameng ho ea mochesong o tloaelehileng, 'me e ka fokotsa tšenyo, kristale ea leqhoa le liphetoho tsa sebopeho sa lijo tse bakoang ke sehatsetsing.
4. Ts'ebetso ea sekhomaretsi
Methylcellulose/Hydroxypropylmethylcellulose e sebelisoa ka bongata bo sebetsang ho nts'etsapele matla a maqhama a matle ha ho ntse ho boloka mongobo le taolo ea tokollo ea tatso.
5. Ho lieha ho sebetsa ha hydration
Tšebeliso ea methylcellulose / hydroxypropylmethylcellulose e ka fokotsa ho pompa viscosity ea lijo nakong ea ts'ebetso ea mocheso, kahoo e ntlafatsa haholo katleho ea tlhahiso. E fokotsa ho senyeha ha boiler le lisebelisoa, e potlakisa linako tsa potoloho ea ts'ebetso, e ntlafatsa ts'ebetso ea mocheso, 'me e fokotsa ho thehoa ha depositi.
6. Ts'ebetso e teteaneng
Methylcellulose/Hydroxypropylmethylcellulose e ka sebelisoa hammoho le starch ho hlahisa phello ea synergistic, e ka eketsang haholo viscosity esita le boemong bo tlaase haholo ba tlatsetso.
7. Tharollo e tsitsitse tlas'a maemo a acidic le tahi
Methylcellulose/Hydroxypropylmethylcellulose tharollo e tsitsitse ho fihlela pH 3 mme e na le botsitso bo botle litharollong tse nang le joala.
Tšebeliso ea methyl cellulose lijong
Methyl cellulose ke mofuta oa ether ea non-ionic cellulose e entsoeng ka ho sebelisa selulose ea tlhaho e le thepa e tala le ho nkela lihlopha tsa hydroxyl sebakeng sa yuniti ea tsoekere ea anhydrous ka selulose ka lihlopha tsa methoxy. E na le ho boloka metsi, thickening, emulsification, sebopeho sa filimi, ho ikamahanya le maemo Wide pH range le mosebetsi oa holim'a metsi le mesebetsi e meng.
Ntho ea eona e ikhethang ka ho fetisisa ke gelation e fetolehang ka mocheso, ke hore, tharollo ea eona ea metsi e etsa gel ha e futhumala, 'me e khutlela ho tharollo ha e pholile. E sebelisoa haholo lijong tse phehiloeng, tse halikiloeng, li-dessert, li-sauces, sopho, lino le linoko. le lipompong.
Super gel ho methyl cellulose e na le matla a gel ho feta makhetlo a mararo ho feta a li-gels tse tloaelehileng tsa methyl cellulose, 'me e na le thepa ea sekhomaretsi e matla haholo, ho boloka metsi le thepa ea ho boloka sebopeho.
E lumella lijo tse tsosolositsoeng ho boloka sebopeho sa tsona se tiileng le molomo o monate ka nako le nako e telele ka mor'a ho futhumatsa hape. Lisebelisoa tse tloaelehileng ke lijo tse leqhoa ka potlako, lihlahisoa tsa meroho, nama e tsosolositsoeng, tlhapi le lihlahisoa tsa lijo tsa leoatleng le lisoseje tse se nang mafura a mangata.
Nako ea poso: Dec-12-2022