Carboxymethyl cellulose:
Ioniccellulose etheryog ua los ntawm cov fiber ntuj (paj rwb, thiab lwm yam) tom qab kev kho alkali, siv sodium monochloroacetate ua tus neeg sawv cev etherification, thiab dhau los ntawm ntau yam kev kho mob tshuaj tiv thaiv. Qib ntawm kev hloov pauv feem ntau yog 0.4 ~ 1.4, thiab nws cov kev ua tau zoo cuam tshuam loj heev los ntawm qib ntawm kev hloov pauv.
(1) Carboxymethyl cellulose muaj hygroscopic ntau dua, thiab nws yuav muaj dej ntau dua thaum khaws cia rau hauv qab cov xwm txheej dav dav.
(2) Cov kua dej Carboxymethyl cellulose tsis tsim cov gel, thiab qhov viscosity txo qis nrog qhov nce ntawm qhov kub. Thaum qhov kub tshaj 50 ° C, qhov viscosity tsis rov qab tau.
(3) Nws qhov kev ruaj khov raug cuam tshuam los ntawm PH. Feem ntau, nws tuaj yeem siv rau hauv gypsum-based mortar, tab sis tsis yog hauv cement-based mortar. Thaum alkaline heev, nws yuav poob viscosity.
(4) Nws cov dej khaws cia qis dua li ntawm methyl cellulose. Nws muaj cov nyhuv qeeb rau gypsum-based mortar thiab txo nws lub zog. Txawm li cas los xij, tus nqi ntawm carboxymethyl cellulose qis dua li ntawm methyl cellulose.
Cellulose alkyl ether:
Cov sawv cev yog methyl cellulose thiab ethyl cellulose. Hauv kev tsim khoom lag luam, methyl chloride lossis ethyl chloride feem ntau yog siv los ua tus neeg sawv cev etherification, thiab cov tshuaj tiv thaiv yog raws li nram no:
Hauv cov mis, R sawv cev rau CH3 lossis C2H5. Alkali concentration tsis yog tsuas yog cuam tshuam rau qib ntawm etherification, tab sis kuj cuam tshuam rau kev siv alkyl halides. Qhov qis dua qhov alkali concentration, qhov muaj zog dua hydrolysis ntawm alkyl halide. Yuav kom txo tau kev siv etherifying tus neeg sawv cev, qhov alkali concentration yuav tsum tau nce. Txawm li cas los xij, thaum qhov alkali concentration siab dhau, qhov o ntawm cellulose raug txo, uas tsis zoo rau qhov etherification reaction, thiab yog li ntawd qhov degree ntawm etherification raug txo. Rau lub hom phiaj no, concentrated lye lossis solid lye tuaj yeem ntxiv thaum lub sijhawm reaction. Lub reactor yuav tsum muaj lub cuab yeej zoo stirring thiab tearing kom cov alkali tuaj yeem faib sib npaug.
Methyl cellulose yog siv dav ua cov khoom ua kom tuab, nplaum thiab tiv thaiv colloid thiab lwm yam. Nws kuj tseem siv tau ua cov khoom sib cais rau emulsion polymerization, cov khoom sib txuas rau cov noob, cov slurry textile, cov khoom ntxiv rau cov khoom noj thiab cov tshuaj pleev ib ce, cov nplaum kho mob, cov khoom siv txheej tshuaj, thiab rau cov xim latex, cov kua luam ntawv, cov khoom siv ceramic, thiab sib xyaw rau hauv cement Siv los tswj lub sijhawm teeb tsa thiab ua kom lub zog pib nce ntxiv, thiab lwm yam.
Cov khoom ethyl cellulose muaj lub zog siab, yooj ywm, tiv taus kub thiab tiv taus txias. ethyl cellulose uas tsis muaj roj ntau yog yaj tau hauv dej thiab cov kua qaub alkaline, thiab cov khoom uas muaj roj ntau yog yaj tau hauv feem ntau cov kuab tshuaj organic. Nws muaj kev sib raug zoo nrog ntau yam resins thiab plasticizers. Nws tuaj yeem siv los ua cov yas, zaj duab xis, varnishes, nplaum, latex thiab cov ntaub ntawv txheej rau tshuaj, thiab lwm yam.
Kev qhia txog cov pab pawg hydroxyalkyl rau hauv cellulose alkyl ethers tuaj yeem txhim kho nws cov solubility, txo nws qhov kev nkag siab rau salting tawm, nce qhov kub gelation thiab txhim kho cov khoom kub yaj, thiab lwm yam. Qhov kev hloov pauv ntawm cov khoom saum toj no sib txawv nrog qhov xwm txheej ntawm cov substituents thiab qhov piv ntawm alkyl rau hydroxyalkyl pawg.
Cellulose hydroxyalkyl ether:
Cov sawv cev yog hydroxyethyl cellulose thiab hydroxypropyl cellulose. Cov neeg sawv cev etherifying yog epoxides xws li ethylene oxide thiab propylene oxide. Siv acid lossis base ua catalyst. Kev tsim khoom lag luam yog los cuam tshuam alkali cellulose nrog tus neeg sawv cev etherification: hydroxyethyl cellulose nrog tus nqi hloov pauv siab yog soluble hauv dej txias thiab dej kub. Hydroxypropyl cellulose nrog tus nqi hloov pauv siab tsuas yog soluble hauv dej txias tab sis tsis nyob hauv dej kub. Hydroxyethyl cellulose tuaj yeem siv ua cov khoom siv tuab rau cov txheej latex, luam ntawv thiab dyeing pastes, cov ntaub ntawv ntsuas ntawv, cov nplaum thiab cov colloids tiv thaiv. Kev siv hydroxypropyl cellulose zoo ib yam li hydroxyethyl cellulose. Hydroxypropyl cellulose nrog tus nqi hloov pauv qis tuaj yeem siv ua cov tshuaj ntxiv, uas tuaj yeem muaj ob qho tib si khi thiab tawg.
Carboxymethylcellulose, luv uaCMC, feem ntau muaj nyob rau hauv daim ntawv ntawm sodium ntsev. Tus neeg sawv cev etherifying yog monochloroacetic acid, thiab cov tshuaj tiv thaiv yog raws li nram no:
Carboxymethyl cellulose yog cov cellulose ether uas yaj tau hauv dej uas siv ntau tshaj plaws. Yav dhau los, nws feem ntau yog siv ua av nkos, tab sis tam sim no nws tau nthuav dav los siv ua cov khoom ntxiv rau cov tshuaj ntxuav khaub ncaws, cov tshuaj pleev xim latex, txheej rau cov ntawv thiab ntawv, thiab lwm yam. Carboxymethyl cellulose ntshiab siv tau rau hauv cov khoom noj, tshuaj, tshuaj pleev ib ce, thiab kuj yog cov nplaum rau cov khoom siv av nplaum thiab pwm.
Polyanionic cellulose (PAC) yog ib qho ioniccellulose etherthiab yog cov khoom siv hloov pauv zoo tshaj plaws rau carboxymethyl cellulose (CMC). Nws yog cov hmoov lossis granule dawb, dawb tawm lossis daj me ntsis, tsis muaj tshuaj lom, tsis muaj saj, yooj yim yaj hauv dej, tsim cov tshuaj pob tshab nrog qee qhov viscosity, muaj kev ruaj khov zoo dua rau kev tiv thaiv kub thiab ntsev, thiab muaj zog tua kab mob. Tsis muaj pwm thiab lwj. Nws muaj cov yam ntxwv ntawm kev ntshiab siab, qib siab ntawm kev hloov pauv, thiab kev faib tawm ntawm cov khoom hloov pauv sib xws. Nws tuaj yeem siv ua binder, thickener, rheology modifier, fluid poob reducer, suspension stabilizer, thiab lwm yam. Polyanionic cellulose (PAC) yog siv dav hauv txhua qhov kev lag luam uas CMC tuaj yeem siv, uas tuaj yeem txo qhov ntau npaum li cas, pab txhawb kev siv, muab kev ruaj khov zoo dua thiab ua tau raws li cov txheej txheem siab dua.
Cyanoethyl cellulose yog cov khoom tshuaj tiv thaiv ntawm cellulose thiab acrylonitrile nyob rau hauv lub catalysis ntawm alkali:
Cyanoethyl cellulose muaj qhov dielectric constant siab thiab coefficient poob qis thiab siv tau ua cov resin matrix rau phosphor thiab electroluminescent teeb. cyanoethyl cellulose uas tsis tshua muaj neeg hloov pauv siv tau ua daim ntawv rwb thaiv tsev rau transformers.
Cov roj cawv ethers siab dua, alkenyl ethers, thiab aromatic alcohol ethers ntawm cellulose tau raug npaj, tab sis tsis tau siv rau hauv kev xyaum.
Cov txheej txheem npaj ntawm cellulose ether tuaj yeem muab faib ua dej nruab nrab txoj kev, cov kuab tshuaj, cov txheej txheem kneading, slurry txoj kev, roj-khoom, kua theem txoj kev thiab kev sib xyaw ua ke ntawm cov txheej txheem saum toj no.
Lub sijhawm tshaj tawm: Plaub Hlis-28-2024