Carboxymethyl cellulose (CMC) yog cov dej anionic-soluble cellulose ether ua los ntawm cov ntaub ntawv ntuj thiab muaj kev tiv thaiv ntuj. Cov pawg hydroxyl hauv nws cov qauv molecular raug hloov los ntawm cov pab pawg carboxymethyl, muab nws cov dej ua kom zoo heev, dej khaws cia, nplaum thiab zaj duab xis thiab zaj duab xis-tsim cov khoom. CMC tuaj yeem faib ua qib kev lag luam, qib khoom noj thiab siv tshuaj, thiab yog tshuaj, thiab siv tshuaj txhua hnub, thiab roj av, textiles, thiab lwm yam.
Cov Txheej Txheem Ntau Lawm thiab Technology
Alkalization theem: lub cellulose raw khoom (feem ntau yog ntoo pulp lossis paj rwb nintrers) reacts nrog sodium hydrocide daws los tsim alkali cellulose. Tus yuam sij rau theem no yog tswj hwm cov kev sib haum xeeb ntawm alkali tov thiab cov tshuaj tiv thaiv cua kom paub meej thiab txhim kho cov kev sib txawv ntawm kev ua kom cov tshuaj tiv thaiv tom ntej.
Kev faib tawm theem: Alkali cellulose yog etherified nrog chloroacetic acid los yog nws sodium ntsev kom qhia cov carboxymethyl pawg. Cov xwm txheej tiv thaiv (xws li qhov ntsuas kub, sijhawm, thiab tus nqi ntawm tus neeg sawv cev) ncaj qha cuam tshuam rau qib kev hloov pauv thiab huv ntawm cov khoom. Cov qauv hnyav lossis cov txheej txheem qhuav yog feem ntau yog siv hauv kev lag luam tsim khoom (xws li isopropanol-dej system) tuaj yeem txhim kho cov tshuaj tiv thaiv kev ua tau zoo thiab txo qis cov khoom ntawm cov khoom lag luam.
Kev Ua Haujlwm Tom Qab Ua: Tom qab cov tshuaj tiv thaiv ua tiav, nruab nrab, ntxuav, los ntawm cov khoom lag luam kom tau txais CMC cov khoom uas tau ua tiav cov qauv. High-purity cmc (xws li cov kws tshuaj) kuj yuav tsum muaj cov qib kev ua kom zoo dua xws li ion pauv lossis hloov tshiab.
Cov Khoom Siv Physicochanemical
Solubility: CMC is easily soluble in water, forming a transparent or slightly turbid viscous solution. Its dissolution rate is affected by the degree of substitution, and products with a high degree of substitution (DS>{{0 {}}. 8) muaj solubility zoo dua. Nws yog insoluble hauv cov kuab tshuaj organic (xws li etetone), tab sis tuaj yeem tiv thaiv qee yam kev txwv dej cawv-dej sib xyaw.
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Rheology: CMC kev daws teeb meem kev nthuav qhia ib txwm muaj pseudoplastic ua kua txiv ntoo, piv txwv li shear cov khoom uas muaj zog. Cov cuab yeej no ua rau nws zoo heev hauv cov ntawv thov uas xav tau cov hmoov ntau (xws li txheej ci thiab tho kev). Qhov kev daws viscosity nce siab heev nrog nce kev nce thiab hnyav hnyav, thiab tus nqi PH yog qhov ruaj khov nyob rau hauv thaj tsam ntawm {0}}.
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Stability: cmc yog acid thiab alkali resistant (pH {{{{}}), tab sis tej zaum hydradyze lossis abrade nyob rau hauv cov muaj kua qaub lossis alkali. Nws muaj zoo thermal stability thiab tuaj yeem witandand high kub siab tshaj 100 degree hauv lub sij hawm luv luv, tab sis ntev-siab yuav ua rau molecular chart breakage.
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Zaj duab xis-ua qauv khoom: CMC tuaj yeem sau hloov pauv, cov yeeb yaj kiab pob tshab nrog cov khoom siv oxygen zoo, thiab haum rau cov khoom siv thiab cov khoom siv tshuaj tiv thaiv.
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Chaw thov
Kev Lag Luam Khoom Noj Khoom Noj: CMC tau siv dav ua cov zaub mov ntxiv (E466) hauv cov mis nyuj khov, kua mis los muab cov tuab yaj ntoo, ua kom huv thiab kav dej. Hauv cov kua txiv ntoo, nws tuaj yeem tiv thaiv cov roj los sis nag lossis nag lossis nag los; Hauv cov khoom ci, nws tuaj yeem txhim kho lub khob noom cookie cov roj tuav thiab ua tiav cov khoom ntxhib los mos.
Kev lag luam txhua hnub: CMC yog siv los ua cov tshuaj txhuam hniav hauv cov tshuaj txhuam hniav kom ntseeg tau tias qhov kev sib txuam thiab extrudability ntawm cov tshuaj txhuam; Nws yog siv los ua cov tuab hauv zawv plaub hau thiab da dej gel los txhim kho cov neeg siv kev paub; Nws cov cuab yeej ua yeeb yaj kiab yog siv hauv cov tshuaj pleev ib ce ua kom ntsej muag lub ntsej muag thiab kev tu tawv nqaij.
Kws Kho Mob Lub Chaw Haujlwm: Cmc yog cov binder thiab ua txhaum rau cov ntsiav tshuaj, uas tuaj yeem tswj hwm cov tshuaj tso tawm tshuaj. Nyob rau hauv qhov muag poob, nws li lub sijhawm tshuaj ua haujlwm; Nyob rau hauv qhov kev hnav khaub ncaws hnav, nws muab kev nyab xeeb los txhawb kho kom zoo.
Kev siv cov ntaub ntawv: hauv cov roj drilling kua, cm hloov kho rheology thiab txo cov dej poob; Hauv cov kab ceramic ci, nws yog siv los ua cov neeg raug ncua los txhim kho cov khaub ncaws zoo grazing; Hauv cov ntawv luam ntawv thiab cov ntxig, nws yog siv los ua slurry kom txhim kho fiber ntau lub zog.
Cim npe nrov: Carboxymethyl cellulose, Tuam Tshoj carboxymethyl cellulose cortrose chaw tsim khoom, cov chaw muag khoom, Hoobkas