Methylcellulose (MC) imhando ye cellulose ether. Cellulose ether makomisheni anowanikwa nekemikari kugadziriswa kwechisikigo cellulose, uye methylcellulose yakakosha cellulose derivative inoumbwa nemethylating (methyl substitution) iyo hydroxyl chikamu che cellulose. Naizvozvo, methylcellulose haisi kungobva paselulosi chete, asiwo yakajairwa cellulose ether.
1. Kugadzirira kwemethylcellulose
Methylcellulose inogadzirwa nekuita cellulose ine methylating agent (yakadai semethyl chloride kana dimethyl sulfate) pasi pemamiriro ealkaline kuti methylate iyo hydroxyl chikamu che cellulose. Izvi zvinonyanya kuitika pamapoka ehydroxyl paC2, C3 uye C6 nzvimbo dze cellulose kuti dzigadzire methylcellulose ine madhigirii akasiyana ekutsiva. The reaction process ndeiyi:
Cellulose (polysaccharide inoumbwa neglucose units) inotanga kushandiswa pasi pemamiriro e-alkaline;
Zvadaro methylating agent inounzwa kuti iite etherification reaction kuti iwane methylcellulose.
Iyi nzira inogona kugadzira methylcellulose zvigadzirwa zvine akasiyana viscosities uye solubility zvivakwa nekudzora maitiro ekuita uye chiyero chemethylation.
2. Zvinhu zve methylcellulose
Methylcellulose ine zvinotevera zvakakosha zvivakwa:
Solubility: Kusiyana nemasikirwo cellulose, methylcellulose inogona kunyungudutswa mumvura inotonhora asi kwete mumvura inopisa. Izvi zvinodaro nekuti kuunzwa kwemethyl substituents kunoparadza hydrogen zvisungo pakati pe cellulose mamorekuru, nekudaro ichidzikisa crystallinity yayo. Methylcellulose inoumba mhinduro yakajeka mumvura uye inoratidza gelation maitiro pakupisa kwakanyanya, ndiko kuti, mhinduro inokora kana ichipisa uye inodzoreredza fluidity mushure mekutonhora.
Non-toxicity: Methylcellulose haina chepfu uye haina kubatwa negayo revanhu. Nokudaro, inowanzoshandiswa muzvokudya uye mishonga yemishonga sekuwedzera, emulsifier uye stabilizer.
Viscosity regulation: Methylcellulose ine yakanaka viscosity regulation zvivakwa, uye mhinduro yayo viscosity ine hukama nemhinduro yekuisa uye huremu hwemamorekuru. Nekudzora dhigirii rekutsiva mune etherification reaction, zvigadzirwa zvemethylcellulose zvine akasiyana viscosity renji zvinogona kuwanikwa.
3. Kushandiswa kwemethylcellulose
Nekuda kwekusiyana kwayo kwemuviri nemakemikari zvimiro, methylcellulose yakashandiswa zvakanyanya mumaindasitiri mazhinji.
3.1 Indasitiri yezvokudya
Methylcellulose chinhu chakajairika chekuwedzera chikafu chinoshandiswa mumhando dzakasiyana dzekugadzira chikafu, kunyanya seyakakora, emulsifier uye stabilizer. Sezvo methylcellulose inogona gel kana ichipisa uye kudzoreredza fluidity mushure mekutonhora, inowanzoshandiswa mukudya kwakaomeswa nechando, zvakabikwa uye soups. Mukuwedzera, iyo yakaderera-calori ye methylcellulose inoita kuti ive chinhu chakakosha mune imwe yakaderera-koriori yekudya mafomula.
3.2 Maindasitiri ezvemishonga nemishonga
Methylcellulose inoshandiswa zvakanyanya muindasitiri yemishonga, kunyanya mukugadzirwa kwemapiritsi, sechinhu chinobatsira uye chinosunga. Nekuda kweiyo yakanaka viscosity kugadzirisa kugona, inogona zvinobudirira kuvandudza mechanical simba uye kupatsanurwa zvinhu zvemapiritsi. Mukuwedzera, methylcellulose inoshandiswawo sechinhu chekugadzira misodzi mu ophthalmology kurapa maziso akaoma.
3.3 Indasitiri yekuvaka uye yezvigadzirwa
Pakati pezvivakwa zvekuvaka, methylcellulose inoshandiswa zvakanyanya musimende, gypsum, machira uye anonamira seyakakora, inochengetedza mvura uye yekare firimu. Nekuda kwekuchengetedza kwayo kwakanaka kwemvura, methylcellulose inogona kuvandudza fluidity uye kushanda kwezvinhu zvekuvaka uye kudzivirira chizvarwa chekutsemuka uye voids.
3.4 Cosmetic indasitiri
Methylcellulose inowanzoshandiswa muindasitiri yezvizorwa seyakakora uye inodzikamisa kubatsira kuumba emulsion anogara kwenguva refu uye gels. Inogona kuvandudza manzwiro echigadzirwa uye kuwedzera iyo moisturizing maitiro. Iyo hypoallergenic uye yakapfava, uye inokodzera ganda rinonzwa.
4. Kuenzanisa kwemethylcellulose nemamwe ether cellulose
Cellulose ethers imhuri huru. Pamusoro pemethylcellulose, kune zvakare ethyl cellulose (EC), hydroxypropyl methylcellulose (HPMC), hydroxyethyl cellulose (HEC) uye mamwe marudzi. Musiyano wavo mukuru uri murudzi uye dhigirii rekutsiviwa kwezvinotsiva pane cellulose molecule, iyo inosarudza solubility yavo, viscosity uye nzvimbo dzekushandisa.
Methylcellulose vs Hydroxypropyl Methylcellulose (HPMC): HPMC ishanduro yakavandudzwa yemethylcellulose. Pamusoro peiyo methyl substituent, hydroxypropyl inounzwa zvakare, izvo zvinoita kuti kunyungudika kweHPMC kuve kwakasiyana. HPMC inogona kunyungudika mune yakafara tembiricha renji, uye tembiricha yayo yekupisa gelation yakakwira kupfuura yemethylcellulose. Naizvozvo, muzvivakwa zvekuvaka uye maindasitiri emishonga, HPMC ine huwandu hwakawanda hwekushandisa.
Methylcellulose vs Ethyl Cellulose (EC): Ethyl cellulose hainyungudike mumvura, asi inonyungudika muorganic solvents. Inowanzo shandiswa mukusimudzira-kuburitsa membrane zvinhu zvekupfeka uye zvinodhaka. Methyl cellulose inonyungudika mumvura inotonhora uye inonyanya kushandiswa seyakakora uye inochengetedza mvura. Nzvimbo dzekushandisa dzayo dzakasiyana nedze ethyl cellulose.
5. Kuvandudza maitiro e cellulose ethers
Nekuwedzera kuri kuita kudiwa kwezvinhu zvinogara uye makemikari egirinhi, cellulose ether makomisheni, kusanganisira methyl cellulose, zvishoma nezvishoma ari kuita chinhu chakakosha chezvakatipoteredza zvine hushamwari. Iyo inotorwa kubva kune yakasikwa chirimwa fiber, inogona kudzokororwa, uye inogona kuve yakasvibiswa munharaunda. Mune ramangwana, nzvimbo dzekushandisa dze cellulose ether dzinogona kuwedzera kuwedzera, senge musimba idzva, zvivakwa zvakasvibirira uye biomedicine.
Semhando ye cellulose ether, methyl cellulose inoshandiswa zvakanyanya mumaindasitiri mazhinji nekuda kwekusiyana kwayo kwemuviri nemakemikari zvimiro. Haisi chete ine yakanaka solubility, isiri-chepfu, uye yakanaka viscosity kugadzirisa kugona, asiwo inoita basa rakakosha mukudya, mushonga, kuvaka uye zvizoro. Mune ramangwana, nekuwedzera kuri kuda kwezvinhu zvine hushamwari kwezvakatipoteredza, tarisiro yekushandiswa kwemethyl cellulose ichave yakakura.
Nguva yekutumira: Oct-23-2024