Cellulose ethers yog ntau yam khoom siv nyob rau hauv ntau yam kev lag luam nrog rau kev tsim kho, tshuaj thiab zaub mov. Kev tsim cov txheej txheem ntawm cellulose ether yog qhov nyuaj heev, suav nrog ntau cov kauj ruam, thiab yuav tsum muaj ntau yam kev txawj ntse thiab cov cuab yeej tshwj xeeb. Hauv tsab xov xwm no, peb yuav tham txog cov txheej txheem tsim khoom ntawm cellulose ethers.
Thawj kauj ruam hauv kev tsim cov cellulose ether yog kev npaj cov khoom siv raw. Cov khoom siv raw siv los tsim cov cellulose ethers feem ntau yog los ntawm cov ntoo pulp thiab cov paj rwb pov tseg. Cov ntoo pulp yog shredded thiab tshuaj ntsuam kom tshem tawm cov khib nyiab loj, thaum paj rwb pov tseg tau ua tiav rau hauv cov tawv nqaij zoo. Lub pulp yog tom qab ntawd txo qhov loj los ntawm kev sib tsoo kom tau txais cov hmoov zoo. Powdered ntoo pulp thiab cov paj rwb pov tseg yog tom qab ntawd muab sib xyaw ua ke hauv ib qho kev faib ua feem raws li qhov xav tau ntawm cov khoom kawg.
Cov kauj ruam tom ntej no suav nrog kev ua tshuaj lom neeg ntawm cov khoom noj sib xyaw. Lub pulp yog thawj zaug kho nrog cov tshuaj alkaline (feem ntau yog sodium hydroxide) txhawm rau rhuav tshem cov qauv ntawm cov cellulose. Cov txiaj ntsig cellulose yog tom qab ntawd kho nrog cov kuab tshuaj xws li carbon disulfide los tsim cellulose xanthate. Qhov kev kho no yog ua nyob rau hauv lub tso tsheb hlau luam nrog ib tug nruam mov ntawm pulp. Cov tshuaj cellulose xanthate yog ces extruded los ntawm ib tug extrusion ntaus ntawv los tsim filaments.
Tom qab ntawd, cov cellulose xanthate filaments tau spun nyob rau hauv ib da dej uas muaj dilute sulfuric acid. Qhov no ua rau rov tsim cov cellulose xanthate chains, tsim cellulose fibers. Cov tshiab cellulose fibers yog ces ntxuav nrog dej kom tshem tawm tej impurities ua ntej yuav bleached. Cov txheej txheem bleaching siv hydrogen peroxide los ntxuav cov cellulose fibers, uas tom qab ntawd ntxuav nrog dej thiab sab laug kom qhuav.
Tom qab cov cellulose fibers qhuav lawm, lawv mus rau txoj kev hu ua etherification. Cov txheej txheem etherification suav nrog kev qhia txog ether pawg, xws li methyl, ethyl lossis hydroxyethyl pawg, rau hauv cellulose fibers. Cov txheej txheem yog nqa tawm siv cov tshuaj tiv thaiv ntawm tus neeg sawv cev etherification thiab acid catalyst nyob rau hauv lub xub ntiag ntawm ib tug hnyav. Cov tshuaj tiv thaiv feem ntau yog ua raws li kev tswj xyuas kom zoo ntawm qhov kub thiab txias kom ntseeg tau tias cov khoom lag luam siab thiab purity.
Lub sijhawm no, cellulose ether yog nyob rau hauv daim ntawv ntawm cov hmoov dawb. Cov khoom tiav lawm tom qab ntawd raug rau cov kev ntsuam xyuas zoo los xyuas kom meej tias cov khoom ua tau raws li qhov xav tau thiab cov lus qhia tshwj xeeb, xws li viscosity, khoom purity thiab noo noo cov ntsiab lus. Tom qab ntawd nws tau ntim thiab xa mus rau tus neeg siv kawg.
Txhawm rau ua kom tiav, cov txheej txheem tsim khoom ntawm cellulose ether suav nrog kev npaj cov khoom siv raw, tshuaj kho mob, spinning, bleaching thiab etherification, ua raws li kev tswj xyuas zoo. Tag nrho cov txheej txheem yuav tsum muaj cov cuab yeej tshwj xeeb thiab kev paub txog tshuaj lom neeg thiab ua raws li kev tswj hwm nruj. Kev tsim cov cellulose ethers yog txheej txheem nyuaj thiab siv sijhawm, tab sis tseem ceeb hauv ntau qhov kev lag luam.
Post lub sij hawm: Jun-21-2023