Carboxymethyl cellulose:
Ioniccellulose etheryog tsim los ntawm ntuj fibers (paj rwb, thiab lwm yam) tom qab alkali kev kho mob, siv sodium monochloroacetate ua etherification tus neeg saib xyuas, thiab mus rau ib tug series ntawm cov tshuaj tiv thaiv. Qib ntawm kev hloov pauv feem ntau yog 0.4 ~ 1.4, thiab nws qhov kev ua tau zoo cuam tshuam los ntawm qib hloov pauv.
(1) Carboxymethyl cellulose yog hygroscopic ntau dua, thiab nws yuav muaj dej ntau dua thaum khaws cia rau hauv cov xwm txheej.
(2) Carboxymethyl cellulose aqueous kua tsis tsim cov gel, thiab cov viscosity txo qis nrog qhov kub thiab txias. Thaum qhov kub siab tshaj 50 ° C, viscosity yog irreversible.
(3) Nws ruaj khov heev cuam tshuam los ntawm PH. Feem ntau, nws tuaj yeem siv rau hauv gypsum-raws li mortar, tab sis tsis yog hauv cov cement-based mortar. Thaum alkaline heev, nws yuav poob viscosity.
(4) Nws cov dej tuav tau qis dua li ntawm methyl cellulose. Nws muaj cov nyhuv retarding ntawm gypsum-raws li mortar thiab txo nws lub zog. Txawm li cas los xij, tus nqi ntawm carboxymethyl cellulose yog qis dua li ntawm methyl cellulose.
Cellulose alkyl ether:
Cov neeg sawv cev yog methyl cellulose thiab ethyl cellulose. Hauv kev tsim khoom, methyl chloride lossis ethyl chloride feem ntau yog siv los ua tus neeg sawv cev etherification, thiab cov tshuaj tiv thaiv yog raws li hauv qab no:
Hauv cov qauv, R sawv cev rau CH3 lossis C2H5. Alkali concentration tsis tsuas yog cuam tshuam rau qib ntawm etherification, tab sis kuj cuam tshuam rau kev noj cov alkyl halides. Qhov qis ntawm alkali concentration, qhov muaj zog ntawm hydrolysis ntawm alkyl halide. Txhawm rau txo qhov noj ntawm tus neeg sawv cev etherifying, alkali concentration yuav tsum tau nce ntxiv. Txawm li cas los xij, thaum lub alkali concentration siab dhau lawm, cov nyhuv o ntawm cellulose yog txo, uas tsis haum rau cov tshuaj tiv thaiv etherification, thiab qib ntawm etherification yog li txo. Rau lub hom phiaj no, concentrated lye los yog khoom lye tuaj yeem ntxiv thaum lub sij hawm cov tshuaj tiv thaiv. Lub reactor yuav tsum muaj ib tug zoo stirring thiab tearing ntaus ntawv thiaj li hais tias cov alkali yuav muab sib npaug zos faib.
Methyl cellulose yog dav siv los ua thickener, nplaum thiab tiv thaiv colloid thiab lwm yam. Nws kuj tseem siv tau los ua dispersant rau emulsion polymerization, bonding dispersant rau cov noob, textile slurry, additive rau zaub mov thiab tshuaj pleev ib ce, adhesive, tshuaj pleev ib ce, thiab rau latex xim, luam ntawv ink, siv sij hawm ntau lawm thiab cov cement.
Ethyl cellulose cov khoom muaj lub zog txhua yam muaj zog, yoog raws, ua haujlwm kub thiab txias. Tsawg-substituted ethyl cellulose yog soluble nyob rau hauv dej thiab dilute alkaline kev daws teeb meem, thiab high-substituted khoom yog soluble nyob rau hauv feem ntau cov organic solvents. Nws muaj kev sib raug zoo nrog ntau yam resins thiab plasticizers. Nws tuaj yeem siv los ua cov yas, cov yeeb yaj kiab, cov kua roj vanish, cov nplaum, cov khoom siv latex thiab txheej txheej rau cov tshuaj, thiab lwm yam.
Kev taw qhia ntawm hydroxyalkyl pawg rau hauv cellulose alkyl ethers tuaj yeem txhim kho nws cov solubility, txo nws cov rhiab heev rau salting tawm, nce gelation kub thiab txhim kho kub yaj zog, thiab lwm yam. Cov degree ntawm kev hloov nyob rau hauv cov khoom saum toj no nws txawv nrog cov xwm ntawm cov substituents thiab qhov piv ntawm alkyl rau hydroxyalkyl pawg.
Cellulose hydroxyalkyl ether:
Cov neeg sawv cev yog hydroxyethyl cellulose thiab hydroxypropyl cellulose. Etherifying agents yog epoxides xws li ethylene oxide thiab propylene oxide. Siv cov kua qaub los yog lub hauv paus ua catalyst. Kev tsim khoom lag luam yog ua rau cov tshuaj alkali cellulose nrog etherification tus neeg sawv cev: hydroxyethyl cellulose nrog cov nqi hloov pauv siab yog soluble hauv dej txias thiab dej kub. Hydroxypropyl cellulose nrog cov nqi hloov pauv siab tsuas yog soluble hauv dej txias tab sis tsis nyob hauv dej kub. Hydroxyethyl cellulose tuaj yeem siv los ua cov thickener rau latex coatings, textile printing thiab dyeing pastes, paper sizing material, adhesives and protective colloids. Kev siv hydroxypropyl cellulose zoo ib yam li hydroxyethyl cellulose. Hydroxypropyl cellulose nrog tus nqi qis qis tuaj yeem siv los ua cov khoom siv tshuaj, uas tuaj yeem muaj ob qho tib si khi thiab tawg.
Carboxymethylcellulose, abbreviated asCMC, 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 dej-soluble cellulose ether feem ntau siv. Yav dhau los, nws tsuas yog siv los ua cov av nkos, tab sis tam sim no nws tau txuas ntxiv los ua cov khoom siv ntxiv ntawm cov tshuaj ntxuav tes, cov khaub ncaws slurry, latex xim, txheej ntawm cov duab los qhia thiab ntawv, thiab lwm yam. Cov ntshiab carboxymethyl cellulose tuaj yeem siv rau hauv cov khoom noj, tshuaj, tshuaj pleev ib ce, thiab kuj yog ib qho nplaum rau ceramics thiab pwm.
Polyanionic cellulose (PAC) yog ib qho ioniccellulose etherthiab yog cov khoom siv high-end hloov rau carboxymethyl cellulose (CMC). Nws yog xim dawb, dawb los yog daj me ntsis hmoov los yog granule, tsis muaj tshuaj lom, saj tsis qab, yooj yim soluble hauv dej, tsim cov tshuaj pob tshab nrog ib qho viscosity, muaj kev ruaj ntseg zoo dua kub thiab ntsev, thiab muaj zog tiv thaiv kab mob. Tsis muaj mildew thiab deterioration. Nws muaj cov yam ntxwv ntawm siab purity, qib siab ntawm kev hloov pauv, thiab kev faib tawm ntawm cov khoom hloov pauv. Nws tuaj yeem siv los ua binder, thickener, rheology modifier, kua poob reducer, suspension stabilizer, thiab lwm yam Polyanionic cellulose (PAC) yog dav siv nyob rau hauv tag nrho cov industries uas CMC tuaj yeem siv tau, uas tuaj yeem txo qhov ntau npaum li cas, pab kev siv, muab kev ruaj ntseg zoo dua thiab ua tau raws li cov txheej txheem ntau dua.
Cyanoethyl cellulose yog cov tshuaj tiv thaiv ntawm cellulose thiab acrylonitrile raws li catalysis ntawm alkali:
Cyanoethyl cellulose muaj lub siab dielectric tas li thiab tsis tshua muaj coefficient thiab tuaj yeem siv los ua cov matrix resin rau phosphor thiab electroluminescent teeb. Tsawg-siv cyanoethyl cellulose tuaj yeem siv los ua cov ntawv insulating rau transformers.
Cov roj ethers ntau dua, alkenyl ethers, thiab aromatic cawv ethers ntawm cellulose tau npaj, tab sis tsis tau siv hauv kev xyaum.
Cov txheej txheem npaj ntawm cellulose ether tuaj yeem muab faib ua hom dej nruab nrab, txoj kev hnyav, txoj kev kneading, slurry method, gas-solid method, kua theem txoj kev thiab kev sib xyaw ntawm cov txheej txheem saum toj no.
Lub sij hawm xa tuaj: Plaub Hlis-28-2024