Methylcellulose (MC) yog cov khoom siv hluav taws xob ib txwm muaj, cov khoom siv ether ether tau los ntawm methylating ntuj cellulose. Vim nws lub cev thiab tshuaj tshwj xeeb thiab tshuaj lom neeg, nws yog dav siv hauv kev tsim kho, khoom noj, tshuaj, tshuaj pleev ib ce, ntawv thiab tsho tiv no.
1. Kev faib tawm los ntawm cov qib hloov chaw
Cov degree ntawm kev hloov pauv (DS) yog hais txog qhov nruab nrab ntawm cov pab pawg hydroxyl hloov los ntawm cov pab pawg methyl ntawm txhua chav muaj methyluculose. Muaj 3 pab pawg hydroxyl ntawm txhua lub nplhaib flucose ntawm lub cellulose molecule uas tuaj yeem hloov los ntawm methyl pawg. Yog li ntawd, qib degree ntawm kev hloov methylcellulose tuaj yeem sib txawv ntawm 0 txog 3.
Cov qib siab ntawm kev hloov methylcellulose (DS> 1.5): Hom khoom lag luam muaj qib siab, tau txo sterubility ntau thiab cov dej tsis zoo. Nws feem ntau siv nyob rau hauv cov ntaub ntawv vaj tsev, txheej thiab lwm yam uas xav tau ib co lej ntawm hydrophobicity.
Tsawg cov qib ntawm kev hloov methylcellose (DS <1.5): Vim hom khoom me me, muaj cov khoom siv zoo dua Hydrophilic, muaj cov solubility ntau dua thiab tuaj yeem ua rau dej txias. Low-substituted methylcellulose is widely used in the food and pharmaceutical industries as a thickener, emulsifier and stabilizer.
2. Kev faib tawm los ntawm kev siv
According to the use of methylcellulose in different fields, it can be divided into two categories: industrial methylcellulose and food and pharmaceutical methylcellulose.
Muaj methylcellulose: feem ntau yog siv hauv kev tsim kho, ceramics, duab dhos ua si, tshuaj pleev xim rau hauv cov cement thiab gypsum cov khoom lag luam los txhim kho kev ua haujlwm thiab durability; Nyob rau hauv cov txheej txheej kev lag luam, methylcellulose tuaj yeem nce kev ruaj khov thiab kev tawg ntawm cov txheej txheem.
Cov zaub mov thiab tshuaj methylcellose: vim nws cov khoom tsis muaj tshuaj lom thiab tsis zoo, methylcellulose yog siv los ua kev ntxiv hauv cov zaub mov thiab tshuaj. Nyob rau hauv cov zaub mov, methylcellulose yog ib qho tuab tuab thiab emulsifier uas tuaj yeem tswj cov qauv khoom noj thiab tiv thaiv kev sib cais lossis sib cais; Hauv cov chaw muag tshuaj, methylcellulose tuaj yeem siv los ua cov tshuaj ntsiav, cov cab kuj siv tshuaj yeeb, thiab tseem muaj cov kev ua haujlwm ntawm cov tshuaj lom neeg. Nws qhov siv tau thiab kev nyab xeeb ua rau methylcellulose nrov heev hauv ob daim teb no.
3. Kev Sib Tw Los Ntawm Solubility
Methylcellulose feem ntau muab faib ua ob pawg ntawm solubility: dej txias hom thiab organic kuab soluble hom.
Cov dej txias ua kua dej Nws feem ntau siv nyob rau hauv cov zaub mov thiab kev lag luam muag khoom raws li lub thickener lossis zaj duab xis yav tas los. Lub solubility ntawm hom methylcellulose tsawg dua nrog kev nce kub, yog li cov yam ntxwv no tuaj yeem siv tau rau kev tsim kho thaum siv hauv kev tsim kho kev tsim kho.
Organic cov kuab tshuaj soluble metylcellulose: Hom tshuaj methylcellulose no thiab feem ntau yog siv cov xim av, cov xim pleev xim rau cov organic media. Vim tias nws cov yeeb yaj kiab zoo-tsim cov khoom thiab cov tshuaj tiv thaiv, nws yog qhov haum rau kev siv hauv qab cov xwm txheej hnyav.
4. Kev faib tawm los ntawm molecular hnyav (viscosity)
Qhov hnyav molecular ntawm methylcellulose muaj qhov cuam tshuam tseem ceeb ntawm nws lub cev cov khoom, tshwj xeeb yog viscosity kev ua tau zoo nyob rau hauv kev daws. Raws li cov molecular hnyav, methylcellulose tuaj yeem faib ua hom piscosity qis thiab hom siab viscosity.
Tsis tshua muaj viscosity metylcellulose: qhov hnyav molecelulose yog tus me me thiab kev daws viscosity yog tsawg. Nws feem ntau siv nyob rau hauv cov zaub mov, tshuaj thiab cov tshuaj pleev ib ce, feem ntau yog rau emulsification, raug ncua thiab thickening. Low-viscosity methyliscellulose tuaj yeem tswj cov zoo thiab cov khaub ncaws zoo, thiab tsim nyog rau cov kev thov kom tsawg.
High-viscosity metylcellulose: nws muaj qhov hnyav molecular hnyav thiab ua cov kev daws teeb meem siab-viscosity tom qab xaus. Feem ntau nws siv hauv cov ntaub ntawv tsim tsev, txheej txheem txheej txheem thiab cov nplaum muaj cov nplaum. High-viscosity metyliscellos muaj zog rau cov tshuab muaj zog, yog li nws tau siv dav hauv cov ntaub ntawv uas xav tau lub zog siab thiab cov kev coj ua tau zoo.
5. Kev sib raug faib los ntawm cov tshuaj hloov kho tshuaj lom neeg
Methylcellulose yog kev hloov kho cellulose derivative. Raws li kev hloov pauv thiab degree, nws tuaj yeem faib ua ib lub methyl cellulose thiab composite hloov cellulose.
Ib Leeg Methyl Cellulose: yog hais txog cellulose cellulose cellulose cellulose cellulose cellulose cellulose cellulose cellulose cellulose cellulose tsuas yog methyl-hloov. Hom khoom no muaj cov khoom siv lub cev thiab cov tshuaj siv tau yooj yim, thiab cov solubility, thickening thiab zaj duab xis-ua zoo thiab ua yeeb yaj kiab zoo.
Composite hloov cellulose: Ntxiv rau methylation, xws li hydroxyprorepation, kev ua kom zoo, thiab lwm yam, los ua cov khoom siv sib xyaw. Piv txwv li, hydroxypropyl methylcellose (HPMC) thiab Carboxymethyl cellulose (CMC). Cov cellite hloov kho no feem ntau muaj cov dej solubility zoo dua, kub tsis kam thiab ruaj khov, thiab tuaj yeem hloov kho ntau yam kev lag luam xav tau.
6. Kev faib tawm los ntawm kev lag luam kev lag luam
Qhov kev thov dav ntawm methylcellulose tso cai rau nws tau cais raws li nws cov yam ntxwv thov hauv ntau yam kev lag luam.
Kev tsim kho metylcellulose: feem ntau yog siv hauv cov khoom tso cai thiab cov khoom siv gypsum raws li dej tuav thiab tuab. Nws tuaj yeem txhim kho cov ntaub ntawv ua haujlwm hauv tsev, tiv thaiv thaum ntxov dej, thiab nce cov tshuab hluav taws xob muaj zog ntawm cov khoom tiav.
Khoom Noj Khoom Haus Kev Lag Luam Methylcellose: Raws li emulsifier, thickener thiab stabilizer hauv kev ua zaub mov noj. Nws tuaj yeem tiv thaiv cov dej poob, txhim kho cov saj thiab qauv ntawm cov khoom noj, thiab nce txee lub neej ntawm cov zaub mov.
Kws tsim kho tshuaj siv tshuaj methylcellose: raws li ib ntsiav tshuaj binder lossis cov khoom siv tawm-tso tawm rau cov tshuaj. Methylcellulose kuj tseem siv tau rau hauv kev npaj ntawm cov tshuaj ntxuav plab yog kev nyab xeeb tshuaj thiab muaj txiaj ntsig zoo.
Kev ua kom zoo nkauj kev lag luam methylcellulose: hauv cov khoom siv saib xyuas tawv nqaij thiab tshuaj pleev ib ce, ua kom huv si los pab cov khoom muag thiab du kev ntxhib los mos thaum lub caij nyoog cov nyhuv ya raws.
Hauv cov ntsiab lus, muaj ntau txoj hauv kev los ntawm kev faib methylcellulose, uas tuaj yeem faib tawm raws li nws daim ntawv thov thiab cov khoom siv solubility. Cov kev sib txawv ntawm cov hau kev pab peb nkag siab zoo dua cov yam ntxwv thiab kev ua haujlwm ntawm methylcellulose, thiab tseem muab lub hauv paus rau nws daim ntawv thov nyob rau ntau daim teb.
Lub Sijhawm Post: Kaum-23-2024