Sodium carboxymethyl cellulose(SCMC) yog cov dej-soluble cellulose derivative uas feem ntau siv nyob rau hauv ntau yam lag luam, xws li zaub mov, tshuaj, thiab tshuaj pleev ib ce, ua ib tug thickener, stabilizer, thiab emulsifier. Cov txheej txheem tsim khoom ntawm SCMC suav nrog ob peb kauj ruam, suav nrog alkalization, etherification, purification, thiab ziab.

1. Alkalization

Thawj kauj ruam hauv kev tsim khoom ntawm SCMC yog alkalization ntawm cellulose. Cellulose yog muab los ntawm ntoo pulp los yog paj rwb fibers, uas tau tawg mus rau hauv me me hais los ntawm ib tug series ntawm mechanical thiab tshuaj kho mob. Cov txiaj ntsig cellulose yog tom qab ntawd kho nrog alkali, xws li sodium hydroxide (NaOH) lossis potassium hydroxide (KOH), kom nws cov reactivity thiab solubility.

Cov txheej txheem alkalization feem ntau suav nrog kev sib xyaw ntawm cellulose nrog kev daws teeb meem ntawm NaOH lossis KOH ntawm qhov kub thiab txias. Cov tshuaj tiv thaiv ntawm cellulose thiab alkali ua rau tsim cov sodium los yog potassium cellulose, uas yog heev reactive thiab yuav hloov tau yooj yim.

2. Etherification

Cov kauj ruam tom ntej hauv kev tsim khoom ntawm SCMC yog etherification ntawm sodium los yog potassium cellulose. Cov txheej txheem no suav nrog kev qhia txog cov pab pawg carboxymethyl (-CH2-COOH) mus rau hauv cov pob txha cellulose los ntawm cov tshuaj tiv thaiv nrog chloroacetic acid (ClCH2COOH) lossis nws cov sodium lossis potassium ntsev.

Cov tshuaj tiv thaiv etherification feem ntau yog nqa tawm hauv dej-ethanol sib tov ntawm qhov kub thiab txias, nrog rau kev sib ntxiv ntawm cov catalyst, xws li sodium hydroxide lossis sodium methylate. Cov tshuaj tiv thaiv yog exothermic heev thiab yuav tsum tau ceev faj tswj cov tshuaj tiv thaiv tej yam kev mob kom tsis txhob overheating thiab cov khoom degradation.

Lub degree ntawm etherification, los yog tus naj npawb ntawm carboxymethyl pawg ib cellulose molecule, yuav tswj tau los ntawm kev kho cov tshuaj tiv thaiv tej yam kev mob, xws li cov concentration ntawm chloroacetic acid thiab cov tshuaj tiv thaiv lub sij hawm. Cov qib siab dua ntawm etherification ua rau cov dej solubility ntau dua thiab cov viscosity thicker ntawm qhov tshwm sim SCMC.

3. Kev huv huv

Tom qab cov tshuaj tiv thaiv etherification, qhov tshwm sim SCMC feem ntau yog paug nrog impurities, xws li unreacted cellulose, alkali, thiab chloroacetic acid. Cov kauj ruam ua kom huv muaj xws li tshem tawm cov impurities kom tau txais cov khoom SCMC ntshiab thiab zoo.

Cov txheej txheem purification feem ntau muaj ntau yam kev ntxuav thiab pom cov kauj ruam uas siv dej los yog aqueous daws ntawm ethanol los yog methanol. Qhov tshwm sim SCMC tom qab ntawd neutralized nrog cov kua qaub, xws li hydrochloric acid lossis acetic acid, kom tshem tawm cov alkali seem thiab kho cov pH rau qhov xav tau ntau yam.

4. Qhuav

Cov kauj ruam kawg hauv kev tsim cov txheej txheem ntawm SCMC yog qhov ziab ntawm cov khoom purified. Cov qhuav SCMC feem ntau yog nyob rau hauv daim ntawv ntawm cov hmoov dawb los yog granule thiab tuaj yeem ua tiav rau hauv ntau hom, xws li kev daws teeb meem, gels, lossis zaj duab xis.

Cov txheej txheem ziab tuaj yeem ua tiav los ntawm kev siv ntau yam txuj ci, xws li tshuaj tsuag kom qhuav, nruas ziab, los yog lub tshuab nqus tsev, nyob ntawm seb cov khoom xav tau thiab cov nplais ntau lawm. Cov txheej txheem ziab yuav tsum tau ua tib zoo tswj kom tsis txhob muaj cua sov ntau dhau, uas tuaj yeem ua rau cov khoom degradation lossis discoloration.

Kev siv ntawm Sodium Carboxymethylcellulose

Sodium carboxymethylcellulose (SCMC) yog dav siv nyob rau hauv ntau yam lag luam, xws li zaub mov, tshuaj, tshuaj pleev ib ce, thiab kev tu tus kheej, vim nws cov dej solubility zoo heev, thickening, stabilizing, thiab emulsifying zog.

Kev lag luam zaub mov

Hauv kev lag luam khoom noj khoom haus, SCMC feem ntau yog siv los ua cov thickener, stabilizer, thiab emulsifier nyob rau hauv ntau yam khoom noj, xws li cov khoom ci, khoom noj siv mis, kua ntses, hnav khaub ncaws, thiab dej haus. SCMC kuj tseem siv los ua cov roj hloov pauv hauv cov khoom noj muaj roj tsawg thiab txo cov calories.