Siv cellulose li cov khoom siv raw, CMC-NA yog npaj los ntawm ob-kauj ruam txoj kev. Thawj yog tus txheej txheem alkalization ntawm cellulose. Tom qab cellulose reacts nrog sodium hydroxide kom paub tsim alkali cellulose nrog chloroacetic acid los tsim CMC-NA, uas hu ua kev tawm tsam here.
Cov tshuaj tiv thaiv kab mob yuav tsum yog alkaline. Cov txheej txheem no yog rau Williamson ether attthesis txoj kev. Cov tshuaj tiv thaiv mechanism yog nucleophilic hloov chaw. Cov tshuaj tiv thaiv kev ua yeeb yam yog alkaline, thiab nyob rau hauv muaj cov dej, qee cov kev sib raug zoo nrog cov khoom lag luam xws li solium glycolic acid. Vim tias muaj cov kev phiv tshuaj ib sab, kev noj ntawm Alkali thiab Otherification yuav nce ntxiv, yog txo qis lub Eherherivation Ethegiciency; Nyob rau tib lub sijhawm, sodium glycolic acid thiab ntau dua ntsev impurities yuav tsim tawm hauv cov kev tsis txaus siab, ua rau muaj kev coj dawb huv thiab kev ua tau zoo ntawm cov khoom. Txhawm rau inhibit sab kev tawm tsam, nws yog ib qho tseem ceeb tsis tsuas yog siv alkali kev xav tau, kev tswj hwm tus nqi ntawm qhov chaw, thiab kub thiab kub, thiab txwv tsis pub muaj kev cuam tshuam.
Raws li cov qauv sib txawv ntawm kev tshaj tawm, kev lag luam ntau lawm ntawm CMC-NA tuaj yeem faib ua ob pawg: txheej txheem dej thiab cov qauv siv hluav taws xob. Cov txheej txheem siv dej raws li cov tshuaj tiv thaiv nruab nrab yog hu ua txoj kev siv dej, uas yog siv los tsim cov alkaline nruab nrab thiab qib qis cmc-na. Cov txheej txheem uas siv cov kuab tshuaj organic raws li cov tshuaj tiv thaiv nruab nrab yog hu ua cov qauv kev tawm tsam, uas yog qhov tsim nyog rau kev tsim cov nruab nrab thiab qib siab Cmc-NA. Ob qho kev tawm tsam yog nqa tawm hauv lub Kneader, uas yog rau cov txheej txheem kneading thiab tam sim no yog txoj kev tseem ceeb rau kev tsim CMC-NA.
Dej-raws li txoj kev
Txoj kev siv dej yog ib txheej txheem kev lag luam ua ntej. Txoj kev no yog kom rov los ua alkali cellulose nrog ib tug neeg sawv cev ntawm cov neeg sawv cev ntawm Alkali thiab dej dawb. Thaum lub sij hawm ua alkalization thiab etherification txheej txheem, tsis muaj qhov nruab nrab hauv nruab nrab hauv lub system. Txoj kev siv dej muaj cov khoom siv tau yooj yim, cov peev nyiaj tsawg thiab tus nqi qis. Qhov tsis zoo yog tias muaj qhov tsis muaj peev xwm ntawm cov kua dej hauv nruab nrab, thiab cov tshuaj tiv thaiv kub nce ntxiv, ua kom muaj kev nrawm nrawm thiab cov khoom lag luam tsis zoo. Txoj kev no yog siv los npaj nruab nrab thiab cov khoom lag luam qis cmc-na cov khoom, xws li cov tshuaj ntxuav, textile sizing cov neeg sawv cev, thiab lwm yam.
Hnyav txoj kev
Cov qauv hnyav yog tseem hu ua Organic kuab kev. Nws lub ntsiab tseem ceeb yog cov alkalization thiab etherification cov tshuaj tiv thaiv tau ua raws li cov xwm txheej uas organic folvent yog siv los ua cov tshuaj tiv thaiv nruab nrab (diluent). Raws li cov tshuaj tiv thaiv diluent siv, nws tau muab faib ua kneading txoj kev thiab slurry txoj kev. Cov qauv hnyav muaj cov txheej txheem tib yam li cov txheej txheem dej-raws li cov txheej txheem dej: alkalization thiab etherification nruab nrab ntawm ob theem no txawv. Cov txheej txheem hnyav omits lub hauv cov txheej txheem hauv Alkali Leaching, nias, tsoo, thiab lwm yam ntawm txoj kev ua dej. Alkalization thiab etherification yog ob qho tib si nqa tawm hauv lub ntsej muag. Qhov tsis zoo yog qhov ntsuas kub yog qhov tsis zoo kuj yog tus tsis zoo, thiab cov kev xav tau thiab cov nqi siab. Tau kawg, rau kev tsim cov khoom siv sib txawv, lub kaw lus ntsuas kub, pub sijhawm noj kom nruj los npaj khoom nrog kev ua tau zoo thiab ua tau zoo.
