Tus qauv thiab xeeb ceem ntawm lub CMC

Tus qauv thiab xeeb ceem ntawm lub CMC
CMC yog ib yam ntawm cov ntaub ntawv tseem ceeb raw yog los ntawm kev kub polymerization cellulose ether cellulose, caustic sis dej qab zib thiab cov chloroacetic kua qaub, nrog ib molecular luj ntawm txhiab kom tsheej lab ntawm cov. CMC yog dawb los yog yellowish hmoov, ntau los yog fibrous khoom, ntxhiab, mov, uas tsis yog-mob toxic. CMC yog phaj siab molecular tshuaj tej dej o o, o o nyob rau hauv dej kom daim ntawv pob tshab nplaum nplaum, waterSuspension P H nqi ntawm 6.5 ~ 8.5. Qhov siv tshuaj tsis yaj hauv cawv, ether, acetone thiab chloroform thiab lwm yam kuab tshuaj organic. Khoom CMC kaj thiab qhov uas sov li chav nyob ruaj khov kuj nyob ringEnvironment qhuav, yuav tsum fwm rau ib lub sij hawm ntev. Lub ntsiab indicators as ntsuas txog qhov ua CMC zoo yog cov (DS) muab teeb thiab teeb polymerization (DP). Cov muab teeb carboxymethyl sodium txoos xa mus rau qhov zoo sib xws nyob rau hauv ib chav tsev ntawm cellulose nruab nrab pes tsawg tus neeg nyob ua ke. Nyob anhydride cellulose molecules ntawm pawg cawv 3: 1 thawj thiab 2 lwm cawv haus cawv. 3 radicals cawv thiaj hnov mob nrog chloride sodium acetate. Kev ua hauj lwm pab pawg hnov mob nrog tus cawv loj, ces lub substituent ua ntej yuav hloov tau tus neeg nyob ua ke ua reactant molecules uas kav ntev npaum cas kuj tsis paub meej. Hloov cov neeg kawm ntawv siab tshaj 3, tab sis siv nyob rau hauv kev lag luam yog cov teeb muab ntau tshaj yog 0.5 ~ 1.2 CMC. Feem ntau speaking, D S sib txawv, kuj txawv qhov xwm ntawm CMC yog: D S loj, zoo transparency thiab stability ntawm cov tshuaj; Thaum D S > 0.3 yog soluble hauv ib alkaline kua aqueous; DS = 0.7, yog soluble kub glycerine; Thaum D S > 0.8, ces cov kua qaub ua hauj thiab ntsev kuj zoo, thiab tsis ua sai sai.
Polymerization cov teeb rau qhov cellulose saw ntev, pom nws cov viscosity qhov luaj li cas. Lub cellulose saw ntev kua viscosity loj, yog li ntawd, yog lub CMC tov. Lub CMC molecule exhibits ib tug qauv tawm.
Qhov luaj li cas CMC viscosity thiab pH, kom txog cua sov lub sij hawm, qhov kuaj pom los yog tsis muaj ntsev thiab lwm yam. Cov tshuaj kua pseudoplastic, muaj coob shear npaum li cas, tus viscosity khees nco tsis no, twb tsis muaj dab tsi ua rau shear thaum, thaum twg tus shear yuav nres tam sim ntawd huv los yeej viscosity; qhuav CMC tau mas 140 ~ 150 kub ob peb feeb; thiab feem ntau yuav muab ib yam,
Thaum twg kom txhob kub viscosity tsub kom C M C dej, cua txias tom qab rov qab, tab sis ntev ntawm kev kub siab ua cov degradation CMC thiab ua tau kom txo qhov viscosity; mob zuj zus lawm muab tus nqi P H, viscosity poob, qhov no yog vim muaj cov acidic pH puag, carboxyl suppressed ionization ua viscosity decreases; ib co hlau ntsev thiab CMC Event, cellulose glycollic kua qaub hlau ntsev nag lossis daus coj. Txhuas ntsev, tin ntsev thiab txhuas ntsev, Gao Tieyan, nyiaj, tooj liab ntsev thiab zirconium Yandu puas hnov mob rau ntsev nag lossis daus thiab CMC, kua viscosity C MC yuav tsis ploj; calcium uas ntsev thiab magnesium ntsev Event nag lossis daus, ces nws yuav siv rau dej; tsis muaj zog concentration of alkali hlau muaj ntsev feem ntau txo cov viscosity uas muaj kua hlau alkali ntsev, tab sis lub hav zoov concentration muaj zog yuav ua rau kom cov viscosity hauv dej, hauv tej txawm ua gelation mob; CMC tsi soluble organic kuab tshuaj, txawm tias yuav ua ib co o o cov tshuaj tiv thaiv, tiam sis CMC tsis tau ua neej; CMC yog ib hygroscopic khoom tso rau hauv tej huab cua, CMC qhuav yuav nqus 12% ~ 25% ntawm cov dej qhuav CMC tsis raug mus ua microbial thiab cov aqueous kua los ntawm tus kab mob no yuav ua rau cov nyhuv uas lom degradation, viscosity tsis. CMC ua zog rau muaj txoj kev colloid, nrog txhua yam ntawm tus colloid. Ntxiv mus, CMC kua kuj siv tau nyob rau hauv adhesives, gelling tus neeg saib xyuas, stabilizing tus neeg saib xyuas thiab dispersing tus neeg saib xyuas thiab zaj duab xis txoj kev ua tus neeg saib xyuas.