Carboxymethyl cellulose:
IONICCellulose etherYog tsim los ntawm ntuj fibers (paj rwb, thiab lwm yam) Tom qab kev kho mob alkali, siv sodium manochloroacetate thaum muaj kev kho mob ntawm lub nroog, thiab tab tom muaj kev tshuaj tiv thaiv kab mob. Cov degree ntawm kev hloov pauv yog feem ntau 0.4 ~ 1.4, thiab nws cov kev ua tau zoo tau cuam tshuam los ntawm kev kawm qib siab.
(1) Carboxymethyl cellulose yog hygroscopic, thiab nws yuav muaj ntau cov dej ntxiv thaum khaws cia nyob rau hauv cov xwm txheej dav dav.
(2) Carboxymethyl cellulose aqueous kua aqueous kua auch tsis tsim kua, thiab viscosity txo nrog qhov nce ntawm kub. Thaum qhov kub tshaj 50 ° C, lub viscosity yog irreversible.
(3) Nws cov ruaj khov yog cuam tshuam ntau heev los ntawm ph. Feem ntau, nws tuaj yeem siv rau hauv gypsum-raws cug, tab sis tsis nyob rau hauv cov cement-raws cug. Thaum alkaline heev, nws yuav ploj viscosity.
(4) Nws cov dej rov qab yog qhov qis dua ntawm methyl cellulose. Nws muaj cov nyhuv retarding rau gypsum-raws li coll thiab txo nws lub zog. Txawm li cas los xij, tus nqi ntawm carboxymethyl cellulose yog qhov qis dua li ntawm methyl cellulose.
Cellulose alkyl ether:
Tus sawv cev sawv ntxov yog methyl cellulose thiab tshuaj celylulose. Hauv kev lag luam ntau lawm, methyl chloride lossis ethyl chloride feem ntau yog siv los yog etherification tus neeg sawv cev, thiab cov tshuaj tiv thaiv muaj raws li hauv qab no:
Nyob rau hauv cov mis, r sawv cev ch3 lossis c2h5. Alkali concentration tsis tsuas yog cuam tshuam txog qib ntawm etherification, tab sis kuj cuam tshuam rau kev noj ntawm alkylal. Qhov qis dua lub alkali concentration, lub zog zog hydrolysis ntawm Alkyl Halide. Txhawm rau kom txo qis kev noj ntawm kev siv tus neeg sawv cev ntawm lub cev, cov alkali concentration yuav tsum tau nce. Txawm li cas los xij, thaum cov alkali concentration yog dhau lawm, qhov o cuam tshuam ntawm cellulose tau txo, uas tsis muaj tshuaj tiv thaiv kab ntsig, thiab kev tawm tsam yog li ntawd txo. Rau lub hom phiaj no, concentrated lye los yog cov lus lye tuaj yeem ntxiv thaum cov tshuaj tiv thaiv. Cov tshuaj reactor yuav tsum muaj qhov zoo nplawm thiab cov kua muag kom cov alkali tuaj yeem yog cov ntawv faib cuavyees.
Methyl cellulose tau siv dav ua cov tuab tuab, cov tshuaj nplaum thiab cov tshuaj pleev ib ce, cov tshuaj pleev ib ce, ib qho qauv tshuaj kho mob Cov khoom siv, thiab rau looj xim, luam ntawv rau hauv kev sib xyaw ua ke, thiab siv cov khoom sib xyaw ua ke thiab ua kom muaj zog thawj zaug, thiab lwm yam.
Cov tshuaj hauv cov tshuaj tiv thaiv kab mob muaj lub zog kho tshuab zog, yooj yim, kub ua hauj thiab cua sov ua tsis taus. Tsawg-hloov cov tshuaj cellulose yog soluble hauv dej thiab dilute alkaline daws teeb meem, thiab cov khoom muaj zog uas yog solubents nyob rau hauv feem ntau cov kuab emicic. Nws muaj kev sib haum zoo nrog ntau yam Resins thiab cov hnab yas. Nws tuaj yeem siv los ua kom cov plastics, zaj duab xis, varnishes, cov nplaum, cov ntaub ntawv yas rau cov tshuaj, thiab lwm yam.
Kev qhia txog cov pab pawg hydroxyalalkyl rau hauv cellulose alkylers tuaj yeem txhim kho nws cov kev hloov pauv kub thiab txhim kho nws cov kev hloov pauv kub sib txawv nrog cov kev hloov chaw thiab cov piv ntawm Alkyl rau Hydroxyalkyl pawg.
Cellulose hydroxyalkyl Ethat:
Cov sawv cev sawv daws yog hydroxyethyl cellulose thiab hydroxypropyl cellulose. Etherifying cov neeg sawv cev yog epoxides xws li ethylene oxide thiab propylene oxide. Siv cov kua qaub lossis hauv paus ua catalyst. Kev tsim khoom lag luam yog los ua alkali cellulose nrog Otherification Tus Neeg Sawv Cev: Hydrotification Tus Neeg Sawv Cev nrog cov khoom txias thiab dej kub. HydroxyPropyl cellulose nrog cov nqi siab tsuas yog soluble hauv dej txias tab sis tsis nyob hauv dej kub. Hydroxyethyl cellulose tuaj yeem siv los ua cov tuab rau cov roj hmab, textile luam ntawv thiab zas ntawv, cov ntawv nyeem cov khoom siv, cov nplaum thiab tiv thaiv kev tiv thaiv thiab tiv thaiv cov kab mob colids. Kev siv ntawm hydroxypropyl cellulose zoo ib yam li ntawd ntawm hydroxyethyl cellulose. HydroxyPropyl cellulose nrog cov nqi qis dua tuaj yeem siv los ua cov tshuaj uas muaj kev zam, uas tuaj yeem muaj ob qho tib si khi thiab ua kom muaj zog.
Carboxymetylcelleculose, sau ntawv luv liCmc, feem ntau muaj nyob rau hauv daim ntawv ntawm sodium ntsev. Tus neeg sawv cev ntawm lub hnub nyoog yog cov acid monochloroacetic acid, thiab cov tshuaj tiv thaiv yog li hauv qab no:
Carboxymethyl cellulose yog qhov dav tshaj plaws siv dej-soluble cellulose ether. Yav dhau los, nws yog tsuas yog siv los ua cov av nkos, tab sis tam sim no nws tau txuas ntxiv los ua cov duab hluav taws, cov duab yas, thiab lwm yam. Ntshiab carboxymethyl cellulose tuaj yeem siv hauv cov khoom noj, Tshuaj, tshuaj pleev ib ce, thiab tseem ua cov nplaum rau ceramics thiab pwm.
Polyanionic cellulose (PAC) yog ionicCellulose etherThiab yog cov khoom lag luam siab hloov rau carboxymethyl cellulose (cmc). Nws yog dawb, tawm-dawb lossis me ntsis daj hmoov lossis cov tshuaj viscic, muaj qee yam yooj yim tiv thaiv hauv cov khoom ruaj khov thiab cov tshuaj tua kab. Tsis muaj mildew thiab detheration. Nws muaj cov yam ntxwv ntawm kev ua siab loj, qib siab ntawm kev hloov chaw, thiab faib cov khoom sib pauv ntawm cov neeg hloov chaw. Nws tuaj yeem siv tau ua binder, thickener, kua roj teeb, uas tuaj yeem siv tau ntau yam kev siv tshuaj, pab txhawb kev siv, muab cov khoom siv zoo dua Ruaj thiab ua kom tau raws cov txheej txheem siab dua siab.
Cyananyl cellulose yog cov khoom lag luam ntawm cellulose thiab acrylonitrile nyob rau hauv lub catalysis ntawm alkali:
Cyananyl cellulose muaj qhov siab dielectric tas li thiab qis qis coefficient thiab tuaj yeem siv los ua cov txheej txheem resin rau phosphor thiab cov hluav taws xob hluav taws xob. Tsawg-hloov cyanoetyl cellulose tuaj yeem siv los ua cov ntawv insulating rau transformers.
Cov neeg siv dej cawv ntau dua, cov neeg muaj kev pab muaj zog ntawm cellulose tau npaj lawm, tab sis tsis tau siv hauv kev coj ua.
Cov kev npaj ntawm cellulose ether tuaj yeem faib ua txoj kev nruab nrab hauv dej, cov qauv kev qhia, cov qauv roj av thiab cov txheej txheem saum toj no.
Lub Sijhawm Post: Apr-28-2024