Siv cellulose li cov khoom siv raw, CMC-NA tau npaj los ntawm ob-kauj ruam txoj kev. Thawj yog tus txheej txheem alkalization ntawm cellulose. Lub cellulose reacts nrog sodium hydroxide los tsim alkali cellulose nrog cloadoacetic acid los tsim CMC-NA, uas yog hu ua etherification.
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 nws yog nrog qee qhov kev tawm tsam nyob rau hauv lub xub ntiag, xws li sodium glycolate acid thiab lwm yam los ntawm cov khoom lag luam. Vim muaj kev tshwm sim sab nraud, kev noj ntawm alkali thiab etherification yuav tau nce ntxiv, yog li txo lub Ehertification efficiency; Ib txhij, sodium glycolic acid thiab ntau dua ntsev impurities tuaj yeem tsim tawm hauv cov tshuaj tiv thaiv sab, ua rau muaj kev coj dawb huv thiab kev ua tau zoo. Txhawm rau txhawm rau hloov sab nraud, nws yog qhov tsim nyog tsis tsuas yog siv alkali, tab sis kuj tseem yuav tswj hwm cov dej alkali thiab txoj kev tawv qaub rau lub hom phiaj txaus. Nyob rau tib lub sijhawm, cov kev xav tau ntawm cov khoom ntawm viscosity thiab degree ntawm hloov chaw yuav tsum tau txiav txim siab, thiab kub yuav tsum tau txiav txim siab tsis to taub. Kev tswj hwm thiab lwm yam, nce tus nqi ntawm etherification, thiab inhibit qhov tshwm sim ntawm cov kev tsis zoo.
Raws li txawv ntawm Othetification txawv, 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 cov txheej txheem dej hauv nruab nrab, uas yog siv los tsim cov alkaline nruab nrab thiab cov qib qis cmc-na. Cov txheej txheem ntawm kev siv cov kuab tshuaj organic raws li cov tshuaj tiv thaiv nruab nrab yog hu ua cov txheej txheem hnyav, uas yog qhov tsim nyog rau kev tsim cov nruab nrab thiab qib CMC-NA. Cov kev tawm tsam no 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.
WAter Nruab Nrab Txujci:
Cov txheej txheem dej-Borne yog cov txheej txheem kev lag luam ua ntej dhau los, uas yog los ua rau alkali cellulose thiab tus sawv cev ntawm cov xwm txheej ntawm Alkali thiab dej. Thaum alkalization thiab etheringment, tsis muaj qhov nruab nrab hauv nruab nrab hauv cov kab ke. Cov cuab yeej siv uas yuav tsum muaj ntawm cov dej xov xwm tawm los yog yooj yim, nrog tsawg dua peev thiab tus nqi qis. Qhov tsis zoo yog qhov tsis muaj nyiaj ntau ntawm cov kua hluav taws xob hauv nruab nrab, cov tshuaj tiv thaiv cua sov nce ntxiv qhov kub thiab txias, ua rau muaj kev ua haujlwm nrawm, thiab cov khoom lag luam tsis zoo. Cov txheej txheem yog siv los npaj nruab nrab thiab cov khoom lag luam qis cmc-na, xws li cov tshuaj ntxuav, textile sizing cov neeg sawv cev thiab cov nyiam.
STxoj Kev:
Cov kev qhia daws teeb meem tseem hu ua cov txheej txheem organic, thiab nws cov tseem ceeb yog tias cov kev tiv thaiv tau raug coj los ua cov tshuaj tiv thaiv kab mob nruab nrab (diluent). Raws li cov nyiaj ntawm cov refucting diluent, nws tau muab faib ua kneading txoj kev thiab slurry txoj kev. Cov qauv hnyav yog tib yam li cov txheej txheem dej ntawm cov txheej txheem dej, thiab kuj muaj ob theem ntawm alkalization thiab etherification nruab nrab ntawm ob theem no txawv. Cov txheej txheem hnyav txuag cov txheej txheem ntawm soaking alkali, kev sib tsoo, kev laus thiab yog li ntawm cov txheej txheem dej, thiab ua kom muaj alhereferization thiab tag nrho cov kev nqa tawm hauv lub Kneader. Qhov tsis zoo yog qhov ntsuas kub yog qhov tsis tshua raug kuj tsis zoo, thiab qhov chaw yuav tsum tau thiab nqi siab. Ntawm chav kawm, rau kev tsim cov khoom siv sib txawv, nws yog qhov tsim nyog los tswj cov kab ke ntsuas kub, pub cov khoom lag luam, yog li ntawd cov khoom lag luam muaj peev xwm npaj tau.
Lub sijhawm Post: Feb-27-2023