Taw qhia rau Cellulose Muaj Cov Neeg Muaj:
Cellulose yog ib qho ntawm cov organic ntau tshaj plaws hauv ntiaj teb, pom nyob hauv cov phab ntsa ntawm tes ntawm cov nroj tsuag. Nws yog polysaccharide ua kom rov qab ua cov dej qab zib ua ke sib txuas ua ke ua ke los ntawm β (1 → 4) glycosidic bonds. Cellulose Cov neeg muaj kev hais ua ke yog derivatives ntawm cellulose, qhov twg ib lossis ntau dua ntawm cov pab pawg hydroxyl (-oh) tau hloov nrog Pawg Ether (-Yog). Cov no hloov cov yam ntxwv ntawm lub cev thiab tshuaj ntawm cellulose, ua rau nws haum rau ntau cov ntawv thov.
Methyl Cellulose: Cov ntsiab lus thiab cov qauv:
Methyl cellulose yog lub cellulose ether derived los ntawm cellulose los ntawm cov pab pawg hydroxyl nrog cov methyl (-ch3) ether pawg. Qhov kev hloov kho no tau ua rau cov polymer nrog txhim kho solubility hauv dej thiab lwm cov kuab tshuaj sib piv rau cov neeg cellulose. Cov qib degree hloov pauv (DS) yog hais txog cov pab pawg nruab nrab ntawm cov pab pawg methhoyl ntxiv rau hauv chav ua si ntawm lub cev nqaij daim tawv thiab txiav txim siab cov khoom ntawm methylulose.
Cov qauv siv tshuaj ntawm methyl cellulose tuaj yeem sib txawv raws li cov degree ntawm kev hloov pauv thiab faib cov neeg methyl ether cov pawg ntawm lub cellulose saw. Feem ntau, methyl cellulose molecules yog linear polymers nrog cov saw sib xyaw, tso cai rau lawv los tsim cov kev daws teeb meem.
Txheej txheem tsim khoom:
Methyl Cellulose feem ntau yog tsim tawm los ntawm etherification kev tiv thaiv ntawm cellulose los yog methyl sulfate los yog methyl sulfate nyob rau hauv muaj alkaline catalysts. Cov tshuaj tiv thaiv cuam tshuam nrog cov pab pawg hauv hydroxyl nrog cov pab pawg methyl ether ether ether, ua rau kev tsim cov methyl cellulose. Cov degree ntawm kev hloov pauv tau tuaj yeem tswj hwm los ntawm kev kho kom haum xws li kub, thiab piv txwv rau methylating tus neeg sawv cev.
Tom qab synthesis, cov khoom undergoes lim dej lim kom tshem tawm impurities thiab cov khoom lag luam. Qhov no suav nrog kev ntxuav, lim, thiab cov txheej txheem kom qhuav kom tau txais tshuaj me methyl cellulose hmoov lossis granules.
Thaj chaw ntawm methyl cellulose:
Methyl Cellulose cov khoom pov thawj cov khoom uas ua rau nws haum rau ntau cov ntawv thov:
Dej solubility: methyl cellulose yog soluble hauv dej txias, ua kom meej, viscous daws teeb meem. Lub solubility tuaj yeem txhim kho ntxiv los ntawm kev nce qib qis dua.
Thermal Stability: methyl cellulose yog thermally ruaj khov, tswj hwm nws cov khoom dhau qhov ntau qhov kub. Cov cuab yeej no ua rau nws haum rau cov ntawv thov uas yuav tsum tau siv cov cua sov.
Zaj duab xis tsim: Methyl cellulose tuaj yeem tsim cov ntawv sau yooj ywm, pob tshab thaum ua cov yeeb yaj kiab los ntawm kev daws. Cov yeeb yaj kiab no muaj cov khoom siv hluav taws xob zoo thiab nrhiav cov ntawv thov hauv cov txheej txheem thiab cov khoom ntim.
Thickening thiab gelling: Methyl cellulose ua raws li cov tshuaj yej thicken hauv aqueous cov kev daws teeb meem, nce viscource thiab txhim kho kev ntxhib los mos. Nws kuj tseem tuaj yeem ua cov gels thim rov qab ntawm cov kev xav ntau dua, uas muaj txiaj ntsig hauv cov khoom noj thiab cov tshuaj.
Cov haujlwm saum npoo av: Methyl cellulose cov khoom siv ua kom pom cov khoom saum npoo npoo, uas tuaj yeem siv hauv emulsification thiab ruaj khov ntawm colloidal.
Cov ntawv thov ntawm Methyl cellulose:
Methyl Cellulose pom muaj kev thov thoob plaws ntau thoob plaws ntau yam kev lag luam vim nws cov khoom lag luam ntau yam:
Kev lag luam khoom noj khoom haus: hauv kev lag luam khoom noj khoom haus, cellulose cellulose tau siv los ua cov khoom siv thickerizes, thiab emulsifier, hnav khaub ncaws, cov khoom qab zib, thiab cov khoom noj. Nws txhim kho kev ntxhib los mos, txhim kho cov ncauj ntse, thiab muab khov-yaj ruaj khov.
Kws Tshuaj Kho Mob: Methyl cellulose tau siv dav hauv cov ntaub ntawv ntawm cov phau ntawv, tsis sib haum xeeb, thiab tus neeg sawv cev tso tawm hauv cov ntsiav tshuaj thiab cov tsiav tshuaj. Nws kuj tseem tuaj yeem siv rau hauv cov ntsiab lus zoo xws li cov kua txiv ntoo, cream, thiab tshuaj pleev rau nws cov thickening thiab mucoadhesive.
Kev Tsim Kho: Methyl cellulose siv rau hauv cov khoom siv xws li cug, plaster, thiab vwg nplaum nplaum thiab dej sib txuas lus ntxiv. Nws txhim kho cov haujlwm ua haujlwm, cov nplaum, thiab tiv thaiv sagging ntawm cov xim sib xyaw ntub dej.
Cov tshuaj pleev ib ce: hauv cov tshuaj pleev ib ce thiab cov khoom siv saib xyuas tus kheej, tshuaj txhuam hniav, tshuaj txhuam hniav, thiab tshuaj txhuam hniav, stabilizer, thiab zaj duab xis, thiab yeeb yaj kiab-ua yeeb yam tus neeg sawv cev. Nws muab viscosity tswj, txhim kho kev ntxhib los mos, thiab txhim kho cov khoom lag luam.
Kev Siv Khoom Siv: Methyl cellulose tau ua haujlwm hauv ntau cov ntawv thov xws li cov ntawv luam tawm, thiab tshuaj ntxuav ua kom zoo nkauj, khi, thiab zaj duab xis-ua yeeb yam.
Cuam tshuam ib puag ncig:
Thaum lub sij hawm methyl cellulose feem ntau yog feem ntau suav tias muaj kev nyab xeeb rau siv hauv cov zaub mov, cov tshuaj, thiab lwm yam kev siv, nws cov kev cuam tshuam ib puag ncig yuav tsum ua tib zoo txiav txim siab. Cellulose muaj kev hais ua yog biodegradable polymers tau muab los ntawm cov khoom siv tau yooj yim dua, ua rau lawv ib puag ncig ua phooj ywg piv rau hluavtaws polymers. Txawm li cas los xij, cov txheej txheem ntau lawm tuaj yeem koom nrog kev siv tshuaj lom thiab lub zog, koom ua ke rau cov pa phem ib puag ncig thiab tsev cog khoom pa tawm.
Kev siv zog tau ua los txhim kho cov kev ruaj khov ntawm txoj kev etherter ether los ntawm kev siv cov khoom ntsuab sab nrauv, thiab cov khoom siv rov qab los ntawm cov khoom lag luam. Tsis tas li ntawd, tshem tawm methyl cellulose-muaj cov khoom lag luam yuav tsum tau tswj hwm kom tsis txhob muaj kuab paug ib puag ncig.
Methyl cellulose yog lub cellulose ether nrog cov khoom tshwj xeeb uas ua rau nws muaj txiaj ntsig thoob plaws ntau yam lag luam. Nws cov dej solubility, thermal ruaj khov, thickening, fluening, suav nrog cov khoom siv ntau, suav nrog cov zaub mov, tshuaj, tshuaj pleev ib ce, thiab kev tsim kho. Thaum lub sij hawm methyl cellulose muaj ntau cov txiaj ntsig, nws cov kev cuam tshuam ib puag ncig yuav tsum tau ua tib zoo tswj hwm los ntawm kev coj ua kev ua lub luag haujlwm zoo thiab pov tseg. Zuag qhia tag nrho, methyl cellulose plays lub luag haujlwm tseem ceeb hauv kev siv thev naus laus zis thiab lub neej txhua hnub, ua rau muaj kev txhim kho cov khoom lag luam thiab cov kev daws teeb meem.
Lub Sijhawm Post: Feb-18-2025