Carboxymethyl cellulose (CMC) thiab sodium carboxymethyl cellulose (CMC-Na) yog cov sib xyaw ua ke hauv kev lag luam tshuaj thiab kev lag luam khoom noj. Lawv muaj qee qhov sib txawv thiab kev sib txuas hauv cov qauv, kev ua tau zoo thiab kev siv. Kab lus no yuav txheeb xyuas kom meej txog cov khoom, kev npaj, kev siv thiab qhov tseem ceeb ntawm ob qho tib si hauv kev sib txawv.
(1) Carboxymethyl cellulose (CMC)
1. Cov khoom siv yooj yim
Carboxymethyl cellulose (CMC) yog carboxymethylated derivative ntawm cellulose thiab yog anionic linear polysaccharide. Nws cov qauv hauv paus yog tias qee pawg hydroxyl (-OH) hauv cellulose molecule tau hloov los ntawm carboxymethyl pawg (-CH₂-COOH), yog li hloov pauv cov solubility thiab kev ua haujlwm ntawm cellulose. CMC feem ntau yog dawb rau me ntsis daj hmoov, tsis muaj ntxhiab thiab tsis qab, insoluble hauv cov kuab tshuaj organic, tab sis tuaj yeem nqus dej los tsim cov gel.
2. Txoj kev npaj
Kev npaj ntawm CMC feem ntau suav nrog cov kauj ruam hauv qab no:
Cov tshuaj tiv thaiv Alkalinization: Sib tov cellulose nrog sodium hydroxide (NaOH) los hloov cov pawg hydroxyl hauv cellulose rau hauv cov ntsev alkaline.
Etherification cov tshuaj tiv thaiv: Alkalized cellulose reacts nrog chloroacetic acid (ClCH₂COOH) los tsim carboxymethyl cellulose thiab sodium chloride (NaCl).
Cov txheej txheem no feem ntau yog nqa tawm hauv dej lossis ethanol tov, thiab cov tshuaj tiv thaiv kub yog tswj ntawm 60 ℃ -80 ℃. Tom qab cov tshuaj tiv thaiv ua tiav, cov khoom CMC kawg tau txais los ntawm kev ntxuav, lim, ziab thiab lwm cov kauj ruam.
3. Daim ntawv thov teb
CMC feem ntau yog siv hauv kev lag luam khoom noj, tshuaj, textile, papermaking thiab lwm yam. Nws muaj ntau yam haujlwm xws li thickening, stabilization, dej tuav thiab tsim zaj duab xis. Piv txwv li, hauv kev lag luam khoom noj khoom haus, CMC tuaj yeem siv ua cov thickener, stabilizer thiab emulsifier rau ice cream, jam, yogurt thiab lwm yam khoom; nyob rau hauv kev lag luam teb, CMC yog siv los ua ib tug binder, thickener thiab stabilizer rau cov tshuaj; Hauv kev lag luam textile thiab papermaking, CMC yog siv los ua slurry additive thiab nto sizing tus neeg sawv cev los txhim kho qhov zoo thiab ruaj khov ntawm cov khoom.
(2) Sodium carboxymethyl cellulose (CMC-Na)
1. Cov khoom siv yooj yim
Sodium carboxymethyl cellulose (CMC-Na) yog sodium ntsev daim ntawv ntawm carboxymethyl cellulose. Piv nrog CMC, CMC-Na muaj dej solubility zoo dua. Nws cov qauv hauv paus yog tias pawg carboxylmethyl hauv CMC yog ib feem lossis tag nrho hloov mus rau hauv lawv cov ntsev ntsev, uas yog, hydrogen atoms ntawm pawg carboxylmethyl yog hloov los ntawm sodium ions (Na⁺). CMC-Na feem ntau yog dawb los yog daj me ntsis hmoov los yog granules, yooj yim soluble nyob rau hauv dej, thiab tsim ib tug viscous pob tshab kua.
2. Txoj kev npaj
Txoj kev npaj ntawm CMC-Na zoo ib yam li CMC, thiab cov kauj ruam tseem ceeb suav nrog:
Cov tshuaj tiv thaiv alkalinization: cellulose yog alkalized siv sodium hydroxide (NaOH).
Etherification cov tshuaj tiv thaiv: Alkalized cellulose yog reacted nrog chloroacetic acid (ClCH₂COOH) los tsim CMC.
Sodiumization cov tshuaj tiv thaiv: CMC hloov mus rau hauv nws daim ntawv sodium ntsev los ntawm cov tshuaj tiv thaiv neutralization hauv cov tshuaj aqueous.
Nyob rau hauv cov txheej txheem no, nws yog ib qho tsim nyog yuav tau xyuam xim rau kev tswj cov tshuaj tiv thaiv kab mob, xws li pH thiab kub, kom tau txais CMC-Na cov khoom nrog kev ua haujlwm zoo.
3. Daim ntawv thov teb
Daim ntawv thov teb ntawm CMC-Na yog dav heev, npog ntau yam kev lag luam xws li zaub mov, tshuaj, tshuaj txhua hnub, thiab roj av. Hauv kev lag luam khoom noj khoom haus, CMC-Na yog ib qho tseem ceeb thickener, stabilizer thiab emulsifier, thiab yog dav siv nyob rau hauv cov khoom noj siv mis, kua txiv hmab txiv ntoo, condiments, thiab lwm yam. Nyob rau hauv lub chaw ua tshuaj, CMC-Na yog siv raws li ib tug nplaum, gel thiab lubricant rau cov ntsiav tshuaj. . Hauv kev lag luam tshuaj lom neeg niaj hnub, CMC-Na yog siv rau hauv cov khoom xws li tshuaj txhuam hniav, tshuaj zawv plaub hau, thiab cov tshuaj txias, thiab muaj cov nyhuv thickening thiab stabilizing zoo. Tsis tas li ntawd, hauv cov roj drilling, CMC-Na yog siv los ua cov thickener thiab rheology regulator rau drilling av nkos, uas tuaj yeem txhim kho cov dej ntws thiab ruaj khov ntawm cov av nkos.
(3) Qhov sib txawv thiab kev sib txuas ntawm CMC thiab CMC-Na
1. Cov qauv thiab cov khoom
Qhov sib txawv tseem ceeb ntawm CMC thiab CMC-Na hauv cov qauv molecular yog tias pawg carboxylmethyl ntawm CMC-Na muaj ib feem lossis tag nrho hauv daim ntawv ntawm sodium ntsev. Qhov sib txawv ntawm cov qauv no ua rau CMC-Na qhia ntau dua solubility thiab zoo dua stability hauv dej. CMC feem ntau yog ib feem lossis tag nrho carboxymethylated cellulose, thaum CMC-Na yog sodium ntsev daim ntawv ntawm carboxymethyl cellulose.
2. Solubility thiab siv
CMC muaj qee yam solubility hauv dej, tab sis CMC-Na muaj cov solubility zoo dua thiab tuaj yeem tsim cov kua dej ruaj khov hauv dej. Vim nws cov dej solubility zoo dua thiab cov yam ntxwv ionization, CMC-Na nthuav tawm kev ua haujlwm zoo dua li CMC hauv ntau daim ntawv thov. Piv txwv li, hauv kev lag luam khoom noj khoom haus, CMC-Na yog dav siv los ua cov thickener thiab stabilizer vim nws cov dej solubility zoo thiab viscosity siab, thaum CMC feem ntau siv rau hauv cov ntawv thov uas tsis tas yuav muaj dej solubility.
3. Cov txheej txheem npaj
Txawm hais tias cov txheej txheem kev npaj ntawm ob qhov zoo sib xws, cov khoom kawg ntawm CMC ntau lawm yog carboxymethyl cellulose, thaum CMC-Na ntxiv hloov carboxymethyl cellulose rau hauv nws daim ntawv sodium ntsev los ntawm cov tshuaj tiv thaiv neutralization thaum lub sij hawm tsim khoom. Qhov kev hloov dua siab tshiab no ua rau CMC-Na ua tau zoo dua hauv qee cov ntawv thov tshwj xeeb, xws li kev ua tau zoo dua hauv cov ntawv thov uas xav tau dej solubility thiab electrolyte stability.
Carboxymethyl cellulose (CMC) thiab sodium carboxymethyl cellulose (CMC-Na) yog ob lub cellulose derivatives nrog cov nqi tseem ceeb. Txawm hais tias lawv zoo sib xws hauv cov qauv, CMC-Na qhia cov dej solubility ntau dua thiab ruaj khov vim yog kev hloov pauv ntawm qee lossis tag nrho cov carboxyl pawg hauv CMC-Na rau hauv sodium ntsev. Qhov sib txawv no ua rau CMC thiab CMC-Na muaj lawv tus kheej qhov zoo thiab kev ua haujlwm hauv ntau daim ntawv thov kev lag luam. Kev nkag siab thiab raug siv ob yam khoom no tuaj yeem pab txhim kho cov khoom ua tau zoo thiab txhim kho kev tsim khoom hauv ntau yam xws li zaub mov, tshuaj, thiab kev lag luam tshuaj.
Lub sij hawm xa tuaj: Jun-17-2024