Siv cov cellulose ua cov khoom siv raw,CMC-Natau npaj los ntawm ob kauj ruam. Thawj yog cov txheej txheem alkalization ntawm cellulose. Cov cellulose reacts nrog sodium hydroxide los tsim alkali cellulose, thiab tom qab ntawd alkali cellulose reacts nrog chloroacetic acid los tsim CMC-Na, uas hu ua etherification.
Lub kaw lus tshuaj tiv thaiv yuav tsum yog alkaline. Cov txheej txheem no yog Williamson ether synthesis method. Lub tshuab tshuaj tiv thaiv yog nucleophilic substitution. Lub kaw lus tshuaj tiv thaiv yog alkaline, thiab nws nrog qee qhov kev tshuaj tiv thaiv sab hauv dej, xws li sodium glycolate, glycolic acid thiab lwm yam khoom siv. Vim muaj kev tshuaj tiv thaiv sab, kev noj alkali thiab etherification agent yuav nce ntxiv, yog li txo qhov kev ua haujlwm etherification; Tib lub sijhawm, sodium glycolate, glycolic acid thiab ntau cov ntsev tsis huv tuaj yeem tsim nyob rau hauv kev tshuaj tiv thaiv sab, ua rau qhov huv thiab kev ua haujlwm txo qis ntawm cov khoom. Txhawm rau kom txo tau cov kev tshuaj tiv thaiv sab, nws yog qhov tsim nyog tsis yog siv alkali tsim nyog, tab sis kuj tswj hwm qhov ntau ntawm cov dej system, qhov concentration ntawm alkali thiab txoj kev sib xyaw rau lub hom phiaj ntawm alkalization txaus. Tib lub sijhawm, qhov yuav tsum tau ua ntawm cov khoom ntawm viscosity thiab degree ntawm kev hloov pauv yuav tsum tau xav txog, thiab qhov ceev thiab kub sib xyaw yuav tsum tau xav txog tag nrho. Kev tswj hwm thiab lwm yam, nce tus nqi ntawm etherification, thiab inhibit qhov tshwm sim ntawm cov kev tshuaj tiv thaiv sab.
Raws li ntau hom etherification media, kev tsim khoom lag luam ntawm CMC-Na muaj peev xwm muab faib ua ob pawg: txoj kev siv dej thiab txoj kev siv cov kuab tshuaj. Txoj kev siv dej ua cov tshuaj tiv thaiv hu ua txoj kev siv dej, uas yog siv los tsim cov alkaline medium thiab cov qib qis CMC-Na. Txoj kev siv cov kuab tshuaj organic ua cov tshuaj tiv thaiv hu ua txoj kev yaj, uas yog qhov tsim nyog rau kev tsim cov qib nruab nrab thiab qib siab CMC-Na. Ob qho kev tiv thaiv no tau ua tiav hauv lub tshuab kneader, uas yog cov txheej txheem kneading thiab tam sim no yog txoj hauv kev tseem ceeb rau kev tsim CMC-Na.
Txoj kev ntsuas dej:
Txoj kev siv dej los ua cov txheej txheem tsim khoom lag luam thaum ub, uas yog los ua cov tshuaj alkali cellulose thiab cov neeg sawv cev etherification nyob rau hauv cov xwm txheej ntawm cov alkali dawb thiab dej. Thaum lub sijhawm alkalization thiab etherification, tsis muaj cov khoom siv organic hauv lub kaw lus. Cov khoom siv uas xav tau ntawm txoj kev siv dej yog qhov yooj yim, nrog rau kev nqis peev tsawg dua thiab tus nqi qis. Qhov tsis zoo yog qhov tsis muaj ntau cov kua nruab nrab, cov cua sov tsim los ntawm cov tshuaj tiv thaiv ua rau qhov kub nce ntxiv, ua kom nrawm dua ntawm cov tshuaj tiv thaiv sab, ua rau muaj kev ua haujlwm etherification qis, thiab cov khoom tsis zoo. Txoj kev no yog siv los npaj cov khoom CMC-Na nruab nrab thiab qis, xws li cov tshuaj ntxuav tes, cov neeg sawv cev textile thiab lwm yam.
Txoj kev siv tshuaj yaj:
Txoj kev siv cov tshuaj yaj kuj hu ua txoj kev siv cov tshuaj organic solvent, thiab nws lub ntsiab lus tseem ceeb yog tias cov tshuaj alkalization thiab etherification raug ua tiav raws li cov tshuaj organic ua cov tshuaj tiv thaiv (diluent). Raws li qhov ntau ntawm cov tshuaj tiv thaiv, nws raug faib ua txoj kev kneading thiab txoj kev slurry. Txoj kev siv cov tshuaj yaj zoo ib yam li cov txheej txheem tiv thaiv ntawm txoj kev dej, thiab kuj muaj ob theem ntawm alkalization thiab etherification, tab sis cov tshuaj tiv thaiv ntawm ob theem no txawv. Txoj kev siv cov tshuaj yaj txuag cov txheej txheem ntawm kev ntub alkali, nias, tsoo, laus thiab lwm yam uas muaj nyob hauv txoj kev dej, thiab alkalization thiab etherification raug ua tiav hauv lub kneader. Qhov tsis zoo yog tias kev tswj qhov kub tsis zoo, thiab qhov chaw xav tau thiab tus nqi siab. Tau kawg, rau kev tsim cov khoom siv sib txawv, nws yog qhov tsim nyog los tswj qhov kub thiab txias ntawm lub cev, lub sijhawm pub mis, thiab lwm yam, kom cov khoom zoo thiab kev ua tau zoo tuaj yeem npaj tau.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2024