Carboxymethyl cellulose (CMC) yog ib qho polymer nrog cov nqi tseem ceeb hauv kev lag luam. Nws yog dej-soluble anionic cellulose ether muab los ntawm ntuj cellulose. Cellulose yog ib qho ntawm feem ntau cov organic polymers nyob rau hauv cov xwm thiab yog lub ntsiab ntawm cov nroj tsuag cell phab ntsa. Cellulose nws tus kheej muaj cov dej tsis zoo hauv dej, tab sis los ntawm kev hloov kho tshuaj, cellulose tuaj yeem hloov mus rau hauv cov khoom siv nrog cov dej solubility zoo, thiab CMC yog ib qho ntawm lawv.
Cov qauv molecular ntawm CMC yog tau los ntawm etherifying hydroxyl (-OH) ib feem ntawm cellulose molecule nrog chloroacetic acid (ClCH2COOH) los tsim ib tug carboxymethyl hloov (—CH2COOH). Cov qauv ntawm CMC khaws cov β-1,4-glucose saw qauv ntawm cellulose, tab sis qee cov hydroxyl pawg hauv nws tau hloov los ntawm pawg carboxymethyl. Yog li ntawd, CMC khaws cov polymer saw cov yam ntxwv ntawm cellulose thiab muaj lub functionality ntawm carboxymethyl pawg.
Chemical Properties ntawm CMC
CMC yog ib qho anionic polymer. Txij li thaum pawg carboxyl (-CH2COOH) hauv nws cov qauv tuaj yeem ionize los tsim cov nqi tsis zoo hauv cov kua dej, CMC tuaj yeem tsim cov tshuaj colloidal ruaj khov tom qab yaj hauv dej. Cov dej solubility thiab solubility ntawm CMC yog cuam tshuam los ntawm nws cov degree ntawm kev hloov (DS) thiab degree ntawm polymerization (DP). Qib ntawm kev hloov pauv yog hais txog cov pawg hydroxyl hloov los ntawm pawg carboxyl hauv txhua chav tsev piam thaj. Feem ntau, qhov siab dua qhov kev hloov pauv, qhov zoo dua cov dej solubility. Tsis tas li ntawd, solubility thiab viscosity ntawm CMC ntawm pH qhov sib txawv kuj txawv. Feem ntau, nws qhia tau zoo dua solubility thiab stability nyob rau hauv nruab nrab los yog alkaline tej yam kev mob, thaum nyob rau hauv acidic tej yam kev mob, lub solubility ntawm CMC yuav txo thiab tej zaum yuav txawm precipitate.
Lub cev muaj zog ntawm CMC
Lub viscosity ntawm CMC tov yog ib qho ntawm nws lub cev tseem ceeb tshaj plaws. Nws viscosity muaj feem xyuam rau ntau yam, suav nrog kev daws teeb meem, qib kev hloov pauv, qib ntawm polymerization, kub thiab pH tus nqi. Qhov viscosity yam ntxwv ntawm CMC ua rau nws pom cov thickening, gelling thiab stabilizing cov teebmeem hauv ntau daim ntawv thov. Lub viscosity ntawm CMC kuj muaj cov yam ntxwv ntawm shear thinning, uas yog, lub viscosity yuav txo nyob rau hauv siab shear quab yuam, uas ua rau nws zoo nyob rau hauv tej yam kev siv uas yuav tsum tau high fluidity.
Kev siv thaj chaw ntawm CMC
Vim nws qhov tshwj xeeb ntawm lub cev thiab tshuaj lom neeg, CMC tau siv dav hauv ntau qhov chaw. Nov yog qee qhov chaw thov tseem ceeb:
Kev lag luam zaub mov: CMC yog siv los ua cov thickener, stabilizer thiab emulsifier hauv kev lag luam khoom noj. Nws tuaj yeem txhim kho qhov kev ntxhib los mos thiab ruaj khov ntawm cov khoom noj, xws li kev siv hauv cov dej khov nab kuab, yogurt, jelly thiab ntses.
Kev lag luam kws tshuaj: CMC yog siv los ua ib qho ntxiv rau cov tshuaj thiab cov nplaum rau cov ntsiav tshuaj hauv thaj chaw tshuaj. Nws kuj yog siv los ua moisturizer thiab zaj duab xis-tsim tus neeg sawv cev hauv qhov txhab hnav.
Cov tshuaj niaj hnub: Hauv cov khoom siv niaj hnub xws li tshuaj txhuam hniav, tshuaj zawv plaub hau, tshuaj ntxuav tes, thiab lwm yam, CMC yog siv los ua cov thickener, tshem tawm tus neeg sawv cev thiab stabilizer los pab cov khoom lag luam kom zoo thiab ua haujlwm zoo.
Roj drilling: CMC yog siv los ua viscosity enhancer thiab pom tus neeg saib xyuas hauv cov roj drilling kua, uas tuaj yeem txhim kho cov khoom ntawm cov dej drilling thiab tiv thaiv kev nkag mus ntawm cov kua dej ntau dhau.
Textile thiab papermaking industries: Hauv kev lag luam textile, CMC yog siv rau textile pulp thiab finishing agents, thaum nyob rau hauv lub papermaking kev lag luam, nws yog siv los ua ib tug reinforcing neeg sawv cev thiab sizing tus neeg saib xyuas rau daim ntawv los txhim kho lub zog thiab smoothness ntawm daim ntawv.
Kev tiv thaiv ib puag ncig thiab kev nyab xeeb
CMC yog ib yam khoom zoo ib puag ncig uas tuaj yeem degraded los ntawm cov kab mob hauv cov kab mob, yog li nws yuav tsis ua rau muaj kuab paug mus ntev rau ib puag ncig. Tsis tas li ntawd, CMC muaj cov tshuaj lom neeg tsawg thiab muaj kev nyab xeeb siab, thiab muaj cov ntaub ntawv kev nyab xeeb zoo hauv cov khoom noj thiab tshuaj siv. Txawm li cas los xij, vim nws qhov kev tsim khoom loj thiab kev siv, kev saib xyuas tseem yuav tsum tau them rau kev kho cov tshuaj khib nyiab uas yuav raug tsim tawm thaum nws cov txheej txheem ntau lawm.
Carboxymethyl cellulose (CMC) yog ib qho dej-soluble anionic polymer uas muaj ntau hom kev ua haujlwm. CMC tau los ntawm kev hloov kho tshuaj khaws cia cov khoom zoo ntawm cov cellulose ntuj thaum muaj dej solubility zoo thiab cov khoom siv lub cev thiab tshuaj lom neeg. Nrog nws cov thickening, gelling, stabilization thiab lwm yam dej num, CMC tau dav siv nyob rau hauv ntau industries xws li zaub mov, tshuaj, tshuaj txhua hnub, roj drilling, textiles thiab papermaking. Nws ib puag ncig kev tiv thaiv thiab kev nyab xeeb kuj ua rau nws nyiam additive nyob rau hauv ntau yam khoom.
Post lub sij hawm: Aug-23-2024