Kev npaj ntawm Carboxymethyl cellulose

Carboxymethyl cellulose (cmc)yog ib tug ntau versatile dej-soluble polymer muab tau los ntawm cellulose, uas yog lub ntuj polysaccharide pom nyob hauv cov phab ntsa ntawm tes. CMC nrhiav cov kev siv ntau yam xws li cov khoom noj, cov chaw muag tshuaj, cov khoom siv tshuaj pleev ib ce xws li, cov ntawv siv, khi, ua yeeb yaj kiab, thiab kev ua yeeb yaj kiab. Kev npaj ntawm CMC koom nrog ntau cov kauj ruam pib los ntawm kev rho tawm ntawm cov khoom noj los ntawm cov khoom noj khoom haus kom ua raws li pawg carboxymethyl.

1. Extraction ntawm cellulose:
Thawj kauj ruam hauv kev npaj CMC yog kev rho tawm ntawm cov khoom noj khoom haus xws li ntoo pulp, paj rwb nyom, lossis lwm cov nroj tsuag cov fibers. Lub cellulose feem ntau tau txais los ntawm cov txheej txheem ntawm cov txheej txheem suav nrog pulping, tshuaj dawb, thiab ua kom huv. Piv txwv li, ntoo pulp tuaj yeem tau los ntawm kev siv tshuab lossis tshuaj lom neeg ua raws li los ntawm cov tshuaj tsw qab nrog cov chlorine lossis hydrogen peroxide kom tshem tawm impurities thiab lub tsev teev ntuj.

2. Kev ua kom lub cellulose:
Thaum cov cellulose tau muab rho tawm, nws yuav tsum tau ua kom tau txais kev pab txhawb cov kev taw qhia ntawm Carboxymethyl pawg. Kev ua kom muaj zog feem ntau ua tiav los ntawm kev kho cellulose nrog so silium hydroxide (NAOH) lossis sodium carbonate (na2co3) nyob rau hauv cov xwm txheej ntawm qhov kub thiab siab. Alkali kev kho mob tawm cov cellulose fibers thiab nce lawv cov kev cuam tshuam los ntawm kev rhuav cov kev sib tw thiab cuam tshuam hydrogen bonds.

3. Carboxymethylation Reaction:
Cov tshuaj tiv thaiv tau ua tiav yog tom qab ntawd raug rau cov tshuaj tiv thaiv carboxymowylation nyob qhov twg carboxymethyl pawg (-ch2cooth pawg ntawm cov pawg hydroxyl ntawm lub cellulose chains. Qhov kev tawm tsam no feem ntau tau ua los ntawm kev rov ua haujlwm ntawm cellulose nrog sodium mirochloratate (SMCA) nyob rau hauv lub xub ntiag ntawm cov alkaline catalyst xws li sodium hydroxide (Naoh). Cov tshuaj tiv thaiv tuaj yeem raug sawv cev raws li hauv qab no:

Cellulose + chloroacetic acid → carboxymethyl cellulose + nacl

Cov tshuaj tiv thaiv nrog rau qhov kub thiab lub sijhawm tiv thaiv kev tiv thaiv thiab cov pawg qib siab tau qhia txog cov pawg ntawm cov pob zeb hauv qab zib.

4. Neutralization thiab Ntxuav:
Tom qab lub carboxymesylation cov tshuaj tiv thaiv, lub txiaj ntsig carboxymethyl cellulose yog neutralized kom tshem tawm ntau dhau alkali thiab tsis muaj cov tshuaj pleev cov accoroacetic acid. Qhov no feem ntau ua tiav los ntawm kev ntxuav cov khoom nrog dej los yog cov tshuaj acidute acted los ntawm kev pom kom meej cais cov khoom sib xyaw ua ke.

5. Purification:
Lub lim koob COLC yog tom qab ntawd ntxuav nrog dej ntau zaus kom tshem tawm impurities xws li ntsev, uas tsis muaj tshuaj tiv thaiv, thiab cov khoom lag luam. Pom kev lossis centrifugation tej zaum yuav ua haujlwm cais cov lim dej Cryc los ntawm kev ntxuav dej.

6. Kom Qhuav:
Thaum kawg, lub lim cov carboxymethyl cellulose tau qhuav kom tshem cov khoom noo thiab tau txais cov khoom xav tau ntawm cov hmoov uas qhuav los yog granules. Kom qhuav yuav siv ntau txoj hauv kev xws li cua kom qhuav, nqus qhuav nyob ntawm cov yam ntxwv uas xav tau ntawm cov khoom kawg.

7. Cwj Pwm thiab Tswjhwm Zoo:
Cov qhuavCmcCov khoom lag luam yog qhov ua rau muaj ntau yam txuj ci hloov chaw xws li kev ntsuas tshuaj, qib siab lossis cov qib hnyav, thiab kev coj dawb huv. Kev ntsuas zoo yog ua kom ntseeg tau tias cov khoom ua tau raws li cov ntaub ntawv yuav tsum tau ua.

Kev npaj ntawm Carboxymethyl cellulose cuam tshuam nrog ntau theem nrog rau kev rho tawm ntawm cov khoom, carboxymethylation cov tshuaj tiv thaiv, kev ua kom huv, kom qhuav, ziab, thiab cov cim. Txhua kauj ruam yuav tsum ua tib zoo tswj cov tshuaj tiv thaiv kev mob thiab ua kom tiav cov txiaj ntsig ntau, yam ntxwv zoo ntawm cov khoom kawg. CMC yog dav siv polymer nrog ntau cov ntawv thov vim nws cov khoom thiab versatility.