Carboxymethyl cellulose (CMC) tau txais tom qab carboxymethylation ntawm cellulose. Nws cov tshuaj aqueous muaj cov haujlwm ntawm thickening, film-forming, bonding, dej tuav, colloid tiv thaiv, emulsification thiab ncua kev kawm ntawv, thiab yog dav siv nyob rau hauv roj av, zaub mov, tshuaj, thiab lwm yam, textile thiab ntawv industries, yog ib qho tseem ceeb tshaj plaws. cellulose ethers.Natural cellulose yog qhov dav tshaj plaws thiab muaj ntau tshaj polysaccharide nyob rau hauv cov xwm, thiab nws cov peev txheej yog nplua nuj heev. Kev hloov kho technology tam sim no ntawm cellulose feem ntau tsom rau etherification thiab esterification. Carboxymethylation yog ib hom etherification technology.
lub cev muaj zog
Sodium carboxymethyl cellulose (CMC) yog ib qho anionic cellulose ether, nrog dawb los yog daj me ntsis flocculent fiber ntau hmoov los yog hmoov dawb tsos, tsw, saj, tsis muaj tshuaj lom; yooj yim soluble nyob rau hauv dej txias los yog dej kub, tsim ib tug tej yam viscosity ntshiab tov. Cov tshuaj yog nruab nrab los yog me ntsis alkaline, insoluble nyob rau hauv ethanol, ether, isopropanol, acetone thiab lwm yam organic solvents, soluble nyob rau hauv 60% dej-muaj ethanol los yog acetone tov. Nws yog hygroscopic, ruaj khov rau lub teeb thiab cua sov, viscosity txo nrog qhov nce ntawm qhov kub thiab txias, cov tshuaj yog ruaj khov ntawm pH 2-10, pH qis dua 2, muaj dej nag, thiab cov viscosity txo thaum pH siab dua 10. Qhov kub discoloration yog 227 ℃, carbonization kub yog 252 ℃, thiab qhov nro ntawm 2% aqueous tov. 71mn/nqe.
tshuaj muaj zog
Nws yog npaj los ntawm cellulose derivatives ntawm carboxymethyl substituents, kho cellulose nrog sodium hydroxide los tsim alkali cellulose, thiab ces reacting nrog monochloroacetic acid. Cov piam thaj hauv tsev uas tsim cov cellulose muaj 3 pawg hydroxyl tuaj yeem hloov tau, yog li cov khoom sib txawv ntawm kev hloov pauv tuaj yeem tau txais. Qhov nruab nrab, 1 mmol ntawm carboxymethyl tau qhia rau 1 g ntawm qhov hnyav qhuav, uas yog insoluble hauv dej thiab dilute acid, tab sis tuaj yeem o thiab siv rau ion pauv chromatography. Carboxymethyl pKa yog kwv yees li 4 hauv dej ntshiab thiab txog 3.5 hauv 0.5mol / L NaCl. Nws yog ib qho tsis muaj zog acidic cation exchanger thiab feem ntau yog siv rau kev sib cais ntawm nruab nrab thiab theem pib cov proteins ntawm pH> 4. Ntau tshaj 40% ntawm pawg hydroxyl yog hloov los ntawm pawg carboxymethyl, uas tuaj yeem yaj hauv dej los tsim cov kua dej khov kho siab-viscosity colloidal.
Lub hom phiaj tseem ceeb
Carboxymethyl cellulose (CMC) yog cov tsis muaj tshuaj lom thiab tsis muaj ntxhiab tsw dawb flocculent hmoov nrog kev ua haujlwm ruaj khov thiab yooj yim soluble hauv dej. Nws cov tshuaj aqueous yog ib qho nruab nrab lossis alkaline pob tshab kua nplaum, soluble hauv lwm cov dej-soluble glues thiab resins, thiab insoluble. hauv cov kuab tshuaj organic xws li ethanol. CMC tuaj yeem siv los ua cov nplaum, thickener, suspending agent, emulsifier, dispersant, stabilizer, sizing agent, thiab lwm yam.
Sodium carboxymethyl cellulose (CMC) yog cov khoom lag luam nrog cov zis ntau tshaj plaws, feem ntau siv dav thiab siv yooj yim tshaj plaws ntawm cellulose ethers, feem ntau hu ua "kev lag luam monosodium glutamate".
1. Nws yog siv rau cov roj thiab cov nkev drilling, zoo khawb thiab lwm yam dej num
① Cov av nkos uas muaj CMC tuaj yeem ua rau cov phab ntsa zoo tsim cov ncuav mog qab zib nyias thiab ruaj khov nrog cov permeability tsawg, uas txo cov dej poob.
② Tom qab ntxiv CMC rau cov av nkos, cov pob zeb drilling tuaj yeem tau txais lub zog pib qis qis, kom cov av nkos tau yooj yim tso cov roj ntim rau hauv nws, thiab tib lub sijhawm, cov khib nyiab pov tseg sai sai hauv qhov av nkos.
③Drilling av nkos, zoo li lwm yam kev ncua kev ncua, muaj qee lub sijhawm ntawm kev muaj sia nyob, thiab qhov sib ntxiv ntawm CMC tuaj yeem ua rau nws ruaj khov thiab ua kom ntev lub neej.
④ Cov av nkos uas muaj CMC tsis tshua muaj kev cuam tshuam los ntawm pwm, yog li nws tsis tas yuav tsum tswj hwm tus nqi pH siab thiab siv cov tshuaj tua kab mob.
⑤ Muaj CMC raws li qhov drilling av nkos ntxuav dej tus neeg saib xyuas, uas tuaj yeem tiv taus cov pa phem ntawm ntau cov ntsev soluble.
⑥ Cov av nkos uas muaj CMC muaj kev ruaj ntseg zoo thiab tuaj yeem txo cov dej poob txawm tias qhov kub siab tshaj 150 ℃.
CMC nrog cov viscosity siab thiab qib siab ntawm kev hloov pauv yog tsim rau cov av nkos uas tsis muaj qhov ntom ntom, thiab CMC nrog cov viscosity tsawg thiab qib siab ntawm kev hloov pauv yog tsim rau cov av nkos uas muaj qhov ntom ntom. Kev xaiv ntawm CMC yuav tsum txiav txim siab raws li cov xwm txheej sib txawv xws li hom av nkos, cheeb tsam thiab qhov tob tob.
2. Siv hauv textile, luam ntawv thiab dyeing kev lag luam. Kev lag luam textile siv CMC ua tus neeg sawv cev sizing rau lub teeb yarn sizing ntawm paj rwb, silk wool, chemical fiber, blended thiab lwm yam ntaub ntawv muaj zog;
3. Siv hauv kev lag luam ntawv CMC tuaj yeem siv los ua daim ntawv nto smoothing tus neeg saib xyuas thiab sizing tus neeg saib xyuas hauv kev lag luam ntawv. Ntxiv 0.1% rau 0.3% CMC rau cov tawv nqaij tuaj yeem txhim kho lub zog tensile ntawm daim ntawv los ntawm 40% mus rau 50%, ua kom cov compressive rupture los ntawm 50%, thiab nce lub kneadability los ntawm 4 mus rau 5 zaug.
4. CMC tuaj yeem siv los ua cov av adsorbent thaum ntxiv rau cov khoom siv hluavtaws; Cov tshuaj niaj hnub xws li tshuaj txhuam hniav kev lag luam CMC glycerin aqueous tov yog siv los ua cov pos hniav rau cov tshuaj txhuam hniav; Kev lag luam kws tshuaj yog siv los ua cov thickener thiab emulsifier; CMC aqueous tov yog thickened thiab siv rau ntab ntxhia ua, thiab lwm yam.
5. Hauv kev lag luam ceramic, nws tuaj yeem siv los ua cov nplaum, plasticizer, tshem tawm tus neeg sawv cev rau glaze, xim kho tus neeg saib xyuas, thiab lwm yam.
6. Siv hauv kev tsim kho los txhim kho cov dej tuav thiab lub zog
7. Nws yog siv rau hauv kev lag luam zaub mov. Kev lag luam khoom noj khoom haus siv CMC nrog cov qib siab hloov pauv raws li cov thickener rau cov dej khov nab kuab, cov kaus poom zaub mov, cov noodles sai sai, thiab ua npuas ncauj stabilizer rau npias, thiab lwm yam. Rau cov thickeners, binders lossis excipients.
8. Kev lag luam kws tshuaj xaiv CMC nrog cov viscosity tsim nyog raws li cov ntsiav tshuaj binder, disintegrant, thiab tus neeg sawv cev rau kev ncua.
Post lub sij hawm: Nov-03-2022