Carboxymethyl cellulose (CMC) tau txais tom qab carboxymethylation ntawm cellulose. Nws cov dej aqueous muaj cov haujlwm ntawm thickening, zaj duab xis tsim, adhesion, dej tuav, colloid tiv thaiv, emulsification thiab ncua kev kawm ntawv, thiab lwm yam. Nws yog dav siv nyob rau hauv roj av, zaub mov, tshuaj, textile thiab ntawv industries, yog ib qho tseem ceeb tshaj plaws cellulose ethers. .Natural cellulose yog cov khoom siv dav dav thiab ntau tshaj polysaccharide nyob rau hauv qhov, 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 cov tshuaj tiv thaiv yog ib hom etherification technology.
lub cev muaj zog
Sodium carboxymethylcellulose (CMC) yog anionic cellulose ether. Nws cov tsos yog dawb los yog daj me ntsis flocculent fiber ntau hmoov los yog hmoov dawb, tsis muaj ntxhiab, tsis qab, thiab tsis muaj tshuaj lom; Nws yog yooj yim soluble nyob rau hauv txias los yog dej kub thiab ua ib tug tej yam viscosity. pob tshab daws. Cov tshuaj yog nruab nrab los yog me ntsis alkaline, insoluble nyob rau hauv ethanol, ether, isopropanol, acetone thiab lwm yam organic solvents, tab sis soluble nyob rau hauv 60% ethanol los yog acetone tov. Nws yog hygroscopic thiab ruaj khov rau lub teeb thiab kub. Lub viscosity txo nrog qhov nce ntawm qhov kub thiab txias. Cov tshuaj yog ruaj khov ntawm pH 2-10. Thaum pH qis dua 2, cov khib nyiab tau los nag. Thaum pH siab tshaj 10, viscosity txo. Qhov kub discoloration yog 227 ° C, carbonization kub yog 252 ° C, thiab qhov nro ntawm 2% aqueous tov yog 71mn / n.
tshuaj muaj zog
Nws yog tau los ntawm kev kho cellulose nrog carboxymethyl substituents, kho cellulose nrog sodium hydroxide los tsim alkali cellulose, thiab ces reacting nrog monochloroacetic acid. Chav tsev piam thaj uas ua cellulose muaj peb pawg hydroxyl uas tuaj yeem hloov tau, yog li cov khoom siv sib txawv ntawm kev hloov pauv tuaj yeem tau txais. Qhov nruab nrab, 1mmol ntawm carboxymethyl pawg ib 1g ntawm qhov hnyav qhuav 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
Carboxymethylcellulose (CMC) yog cov tsis muaj tshuaj lom, 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 organic solvents xws li ethanol. CMC tuaj yeem siv tau los ua cov ntawv khi, cov khoom hnyav, cov neeg ua haujlwm ncua, emulsifier, dispersant, stabilizer, sizing agent, thiab lwm yam.
Sodium carboxymethyl cellulose (CMC) yog cov khoom lag luam nrog cov zis ntau tshaj plaws, kev siv dav tshaj plaws thiab kev siv yooj yim tshaj plaws ntawm cov cellulose ethers, feem ntau hu ua "kev lag luam monosodium glutamate".
1. Siv nyob rau hauv cov roj thiab cov nkev drilling, zoo khawb thiab lwm yam dej num
① CMC-muaj av nkos tuaj yeem ua rau phab ntsa zoo tsim lub ncuav mog qab zib nyias thiab ruaj khov nrog cov permeability tsawg, txo cov dej tsis zoo.
② Tom qab ntxiv CMC rau cov av nkos, cov pob zeb drilling tuaj yeem tau txais qhov qis qis qis qis, kom cov av nkos tau yooj yim tso cov roj ntim rau hauv nws, thiab tib lub sijhawm, cov khib nyiab tuaj yeem muab pov tseg sai sai hauv qhov av nkos.
③ Drilling av nkos, zoo li lwm yam kev tshem tawm thiab kev sib cais, muaj lub neej txee. Ntxiv CMC tuaj yeem ua kom ruaj khov thiab ua kom lub neej ntev.
④ CMC-muaj av nkos 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 khoom khaws cia.
⑤ Muaj CMC ua tus neeg sawv cev kho mob rau cov av nkos flushing kua, uas tuaj yeem tiv taus cov pa phem ntawm ntau cov ntsev soluble.
⑥ CMC-muaj av nkos muaj kev ruaj ntseg zoo thiab tuaj yeem txo cov dej poob txawm tias qhov kub siab tshaj 150 ° C.
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 nyob rau hauv textile, printing thiab dyeing industries. Hauv kev lag luam textile, CMC yog siv los ua tus neeg sawv cev sizing rau lub teeb yarn sizing ntawm paj rwb, txhob lo lo ntxhuav, tshuaj fiber ntau, blended thiab lwm yam ntaub ntawv muaj zog;
3. Siv rau hauv kev lag luam ntawv CMC tuaj yeem siv los ua tus neeg saib xyuas daim ntawv thiab sizing tus neeg sawv cev hauv kev lag luam ntawv. Ntxiv 0.1% rau 0.3% ntawm CMC nyob rau hauv lub pulp yuav ua rau kom lub zog tensile ntawm daim ntawv los ntawm 40% mus rau 50%, ua rau kom tawg tsis kam los ntawm 50%, thiab nce lub kneading khoom 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 glycerol aqueous tov yog siv los ua cov tshuaj txhuam hniav hauv cov pos hniav; Kev lag luam tshuaj yog siv los ua cov thickener thiab emulsifier; CMC aqueous tov yog siv los ua ntab tom qab thickening Mining thiab lwm yam.
5. Nws tuaj yeem siv los ua cov nplaum, plasticizer, tshem tawm tus neeg sawv cev ntawm glaze, xim kho tus neeg saib xyuas, thiab lwm yam hauv kev lag luam ceramic.
6. Siv hauv kev tsim kho los txhim kho cov dej tuav thiab lub zog
7. Siv hauv kev lag luam zaub mov. Kev lag luam khoom noj khoom haus siv CMC nrog rau qib siab ntawm kev hloov pauv raws li lub thickener rau ice cream, cov zaub mov hauv kaus poom, cov noodles, thiab ua npuas ncauj stabilizer rau npias. Rau thickeners, binders los yog conformal agents.
8. Kev lag luam kws tshuaj xaiv CMC nrog cov viscosity tsim nyog raws li cov ntawv khi,
disintegrating tus neeg sawv cev ntawm cov ntsiav tshuaj, thiab tus neeg sawv cev ncua kev ncua, thiab lwm yam.
Post lub sij hawm: Nov-24-2022