Kev tsim cov cellulose ntshiab ethers koom nrog ob peb kauj ruam, pib los ntawm kev rho tawm ntawm cellulose los ntawm cov khoom cog mus rau cov txheej txheem tshuaj hloov kho.
Cellulose Sourcing: Cellulose, polysaccharide pom nyob rau hauv cov phab ntsa ntawm tes ntawm cov nroj tsuag, ua cov khoom siv raw rau cellulose ethers.Cov peev txheej muaj xws li ntoo pulp, paj rwb, thiab lwm yam nroj tsuag fibrous xws li jute lossis hemp.
Pulping: Pulping yog txheej txheem ntawm kev sib cais cellulose fibers los ntawm cov khoom cog.Qhov no feem ntau ua tiav los ntawm kev siv tshuab lossis tshuaj lom neeg.Cov tshuab pulping suav nrog kev sib tsoo lossis kho cov khoom kom cais cov fibers, thaum cov tshuaj pulping, xws li cov txheej txheem kraft, siv cov tshuaj xws li sodium hydroxide thiab sodium sulfide kom yaj lignin thiab hemicellulose, tawm hauv cellulose qab.
Bleaching (Yeem): Yog tias xav tau siab purity, lub cellulose pulp yuav dhau los ua cov txheej txheem bleaching kom tshem tawm cov lignin, hemicellulose, thiab lwm yam impurities.Chlorine dioxide, hydrogen peroxide, los yog oxygen yog cov tshuaj bleaching uas siv rau hauv cov kauj ruam no.
Kev Ua Haujlwm: Cellulose ethers feem ntau yog npaj los ntawm reacting cellulose nrog alkali hlau hydroxides los ua ib qho alkali cellulose nruab nrab.Cov kauj ruam no suav nrog o ntawm cov cellulose fibers hauv kev daws ntawm sodium hydroxide lossis potassium hydroxide ntawm qhov kub siab.Qhov kev ua kom cov kauj ruam no ua rau cov cellulose ntau reactive rau etherification.
Etherification: Etherification yog kauj ruam tseem ceeb hauv kev tsim cov cellulose ethers.Nws koom nrog kev qhia ether pawg (xws li methyl, ethyl, hydroxyethyl, lossis hydroxypropyl pawg) mus rau hauv cov pob txha cellulose.Cov tshuaj tiv thaiv no feem ntau yog ua los ntawm kev kho cov alkali cellulose nrog etherifying agents xws li alkyl halides (piv txwv li, methyl chloride rau methyl cellulose), alkylene oxides (piv txwv li, ethylene oxide rau hydroxyethyl cellulose), los yog alkyl halohydrins (xws li, propylene cellulose rau hydroxypropylene oxides. ) nyob rau hauv kev tswj ntawm kub, siab, thiab pH.
Neutralization thiab Ntxuav: Tom qab etherification, cov tshuaj tiv thaiv sib tov yog neutralized kom tshem tawm cov alkali ntau dhau.Qhov no feem ntau yog ua los ntawm kev ntxiv cov kua qaub, xws li hydrochloric acid lossis sulfuric acid, kom tsis txhob muaj cov alkali thiab precipitate cellulose ether.Cov khoom uas tau tshwm sim yog tom qab ntawd ntxuav nrog dej kom tshem tawm cov tshuaj seem thiab cov khoom siv los ntawm cov khoom.
Kev ziab: Cov khoom ntxuav cellulose ether feem ntau qhuav kom tshem tawm cov dej noo ntau dhau thiab tau txais daim ntawv kawg los yog granular.Qhov no tuaj yeem ua tiav siv cov txheej txheem xws li cua ziab, nqus kom qhuav, lossis tshuaj tsuag kom qhuav.
Kev Tswjhwm Zoo: Kev tswj xyuas kev ua tau zoo yog qhov tseem ceeb los xyuas kom meej qhov purity, sib xws, thiab cov khoom xav tau ntawm cov cellulose ethers.Qhov no suav nrog kev sim cov khoom rau qhov tsis xws li qib kev hloov pauv, viscosity, particle loj faib, cov ntsiab lus noo noo, thiab purity siv cov txheej txheem tshuaj ntsuam xws li titration, viscometry, thiab spectroscopy.
Ntim thiab Cia: Thaum cov cellulose ethers qhuav thiab kuaj tau zoo, lawv tau ntim rau hauv cov thawv tsim nyog thiab khaws cia nyob rau hauv kev tswj xyuas kom tsis txhob ya raws thiab degradation.Kev sau npe kom raug thiab cov ntaub ntawv ntawm cov ntsiab lus batch kuj tseem ceeb rau kev taug qab thiab kev ua raws cai.
Los ntawm kev ua raws li cov kauj ruam no, nws muaj peev xwm tsim cov cellulose ethers uas xav tau rau ntau yam kev siv hauv kev lag luam, suav nrog tshuaj, khoom noj, tshuaj pleev ib ce, textiles, thiab cov ntaub ntawv tsim kho.
Lub sij hawm xa tuaj: Plaub Hlis-24-2024