Methylcellulose (MC) yog cov khoom siv tshuaj sib xyaw ua ke polymer, hloov kho cellulose ether tau los ntawm methylating natural cellulose. Vim nws cov khoom tshwj xeeb ntawm lub cev thiab tshuaj lom neeg, nws yog dav siv hauv kev tsim kho, khoom noj khoom haus, tshuaj, tshuaj pleev ib ce, ntawv thiab txheej.
1. Kev faib tawm los ntawm qib kev hloov pauv
Qib ntawm kev hloov pauv (DS) yog hais txog qhov nruab nrab ntawm cov pab pawg hydroxyl hloov los ntawm methyl pawg ntawm txhua chav tsev piam thaj hauv methylcellulose. Muaj 3 pawg hydroxyl ntawm txhua lub nplhaib ntawm cov cellulose molecule uas tuaj yeem hloov tau los ntawm pawg methyl. Yog li ntawd, qhov degree ntawm kev hloov ntawm methylcellulose tuaj yeem sib txawv ntawm 0 mus rau 3. Raws li kev hloov pauv, methylcellulose tuaj yeem muab faib ua ob pawg: qib siab ntawm kev hloov pauv thiab qib qis ntawm kev hloov pauv.
Qib siab ntawm kev hloov methylcellulose (DS> 1.5): Cov khoom no muaj qib siab ntawm methyl hloov pauv, yog li nws yog ntau hydrophobic, muaj qis solubility thiab dej tsis kam. Nws yog feem ntau siv hauv cov khoom siv hauv tsev, txheej txheej thiab lwm lub sijhawm uas yuav tsum tau muaj qee yam ntawm hydrophobicity.
Tsawg degree ntawm kev hloov methylcellulose (DS < 1.5): Vim muaj kev hloov methyl tsawg dua, cov khoom no yog hydrophilic ntau dua, muaj cov dej zoo dua thiab tuaj yeem yaj hauv dej txias. Tsawg-substituted methylcellulose yog dav siv nyob rau hauv cov khoom noj thiab tshuaj industries raws li ib tug thickener, emulsifier thiab stabilizer.
2. Kev faib tawm los ntawm kev siv
Raws li kev siv methylcellulose hauv ntau qhov chaw, nws tuaj yeem muab faib ua ob pawg: muaj methylcellulose thiab zaub mov thiab tshuaj methylcellulose.
Muaj methylcellulose: Feem ntau yog siv rau hauv kev tsim kho, txheej, papermaking, ceramics thiab lwm yam lag luam ua cov thickener, nplaum, zaj duab xis qub, dej tuav tus neeg saib xyuas, thiab lwm yam. kav ntev; Hauv kev lag luam coatings, methylcellulose tuaj yeem ua rau kom muaj kev ruaj ntseg thiab dispersibility ntawm txheej txheej.
Khoom noj khoom haus thiab tshuaj methylcellulose: Vim nws cov khoom tsis muaj tshuaj lom thiab tsis muaj teeb meem, methylcellulose yog siv los ua ib qho ntxiv hauv cov zaub mov thiab tshuaj. Nyob rau hauv cov zaub mov, methylcellulose yog ib tug ntau thickener thiab emulsifier uas yuav stabilize cov zaub mov qauv thiab tiv thaiv stratification los yog sib cais; nyob rau hauv kev lag luam tshuaj, methylcellulose tuaj yeem siv los ua lub plhaub capsule, cov neeg nqa tshuaj, thiab tseem muaj cov haujlwm ntawm cov tshuaj tiv thaiv-tso tawm. Nws txoj kev noj qab haus huv thiab kev nyab xeeb ua rau methylcellulose nrov heev hauv ob txoj haujlwm no.
3. Kev faib tawm los ntawm solubility
Methylcellulose feem ntau muab faib ua ob pawg raws li kev solubility: dej txias soluble hom thiab organic hnyav soluble hom.
Cov dej txias soluble methylcellulose: Hom methylcellulose no tuaj yeem yaj hauv dej txias los tsim cov pob tshab, cov kua nplaum nplaum tom qab tawg. Nws yog feem ntau siv nyob rau hauv cov zaub mov thiab tshuaj industries raws li ib tug thickener los yog zaj duab xis qub. Lub solubility ntawm hom methylcellulose no txo qis nrog qhov kub thiab txias, yog li qhov no tuaj yeem siv los tswj kev tsim kho thaum siv hauv kev tsim kho kev lag luam.
Organic solvent soluble methylcellulose: Hom methylcellulose no tuaj yeem yaj hauv cov kuab tshuaj organic thiab feem ntau siv rau hauv cov xim, coatings thiab lwm yam kev lag luam uas yuav tsum tau muaj cov txheej txheem organic. Vim nws txoj kev ua yeeb yaj kiab zoo thiab tshuaj lom neeg tsis kam, nws yog qhov tsim nyog rau kev siv nyob rau hauv kev lag luam hnyav.
4. Kev faib tawm los ntawm qhov hnyav molecular (viscosity)
Qhov hnyav molecular ntawm methylcellulose muaj qhov cuam tshuam loj rau nws lub cev, tshwj xeeb tshaj yog kev ua haujlwm viscosity hauv cov tshuaj. Raws li qhov hnyav molecular, methylcellulose tuaj yeem muab faib ua hom viscosity tsawg thiab hom viscosity siab.
Tsawg viscosity methylcellulose: Qhov hnyav molecular kuj me me thiab cov tshuaj viscosity tsawg. Nws yog feem ntau siv rau hauv cov khoom noj, tshuaj thiab tshuaj pleev ib ce, feem ntau yog rau emulsification, ncua kev kawm ntawv thiab thickening. Tsawg-viscosity methylcellulose tuaj yeem tswj cov dej ntws zoo thiab sib xws, thiab tsim nyog rau cov ntawv thov uas xav tau cov tshuaj viscosity tsawg.
High-viscosity methylcellulose: Nws muaj qhov hnyav molecular thiab tsim cov viscosity siab heev tom qab dissolution. Nws yog feem ntau siv hauv cov khoom siv hauv tsev, coatings thiab industrial adhesives. High-viscosity methylcellulose tuaj yeem ua kom muaj zog txhua yam, hnav tsis kam thiab adhesion ntawm cov tshuaj, yog li nws yog dav siv nyob rau hauv cov ntaub ntawv uas yuav tsum tau muaj zog thiab siab hnav tsis kam.
5. Kev faib tawm los ntawm qib kev hloov kho tshuaj
Methylcellulose yog tshuaj hloov kho cellulose derivative. Raws li txoj kev hloov kho thiab kev kawm qib siab, nws tuaj yeem muab faib ua ib leeg methyl cellulose thiab composite modified cellulose.
Ib leeg methyl cellulose: hais txog cellulose ethers uas tsuas yog hloov methyl. Cov khoom no muaj lub cev thiab tshuaj lom neeg ruaj khov, thiab nws cov solubility, thickening thiab film-forming zog kuj zoo.
Composite modified cellulose: Ntxiv nrog rau cov tshuaj methylation, nws yog tshuaj kho ntxiv, xws li hydroxypropylation, ethylation, thiab lwm yam, los tsim cov khoom sib xyaw ua ke. Piv txwv li, hydroxypropyl methylcellulose (HPMC) thiab carboxymethyl cellulose (CMC). Cov kev hloov kho celluloses feem ntau muaj cov dej solubility zoo dua, tiv thaiv tshav kub thiab ruaj khov, thiab tuaj yeem hloov mus rau ntau yam kev xav tau ntawm kev lag luam.
6. Kev faib tawm los ntawm daim ntawv thov kev lag luam
Daim ntawv thov dav ntawm methylcellulose tso cai rau nws muab cais raws li nws daim ntawv thov yam ntxwv hauv kev lag luam sib txawv.
Kev tsim kho kev lag luam methylcellulose: Feem ntau siv hauv cov cement-based thiab gypsum-raws li cov ntaub ntawv raws li cov dej tuav thiab cov thickener. Nws tuaj yeem txhim kho kev ua haujlwm ntawm cov khoom siv hauv tsev, tiv thaiv dej thaum ntxov, thiab ua kom lub zog ntawm cov khoom tiav.
Khoom noj khoom haus kev lag luam methylcellulose: Ua ib qho emulsifier, thickener thiab stabilizer hauv kev ua zaub mov. Nws tuaj yeem tiv thaiv dej poob, txhim kho saj thiab qauv ntawm cov zaub mov, thiab ua kom lub txee lub neej ntawm cov zaub mov.
Kev lag luam kws tshuaj methylcellulose: Raws li cov ntsiav tshuaj binder lossis cov ntaub ntawv tso tawm rau cov tshuaj. Methylcellulose kuj tseem siv tau rau hauv kev npaj cov tshuaj gastrointestinal raws li cov tshuaj muaj kev nyab xeeb thiab siv tau zoo.
Kev lag luam tshuaj pleev ib ce methylcellulose: Hauv cov khoom tu tawv nqaij thiab tshuaj pleev ib ce, methylcellulose yog siv los ua cov thickener, emulsifier thiab moisturizer los pab cov khoom tsim ib qho kev ntxhib los mos thiab du thaum ua kom cov nyhuv moisturizing.
Hauv cov ntsiab lus, muaj ntau txoj hauv kev los faib cov methylcellulose, uas tuaj yeem faib raws li nws cov qauv tshuaj, lossis raws li nws daim ntawv thov teb thiab cov khoom solubility. Cov kev faib tawm sib txawv no pab peb nkag siab zoo dua cov yam ntxwv thiab kev ua haujlwm ntawm methylcellulose, thiab tseem muab cov ntsiab lus theoretical rau nws daim ntawv thov hauv ntau qhov chaw.
Post lub sij hawm: Oct-23-2024