Cellulose ether yog ib tug qauv ethered ua los ntawm cellulose. Txhua lub cellosyl nplhaib hauv lub cellulolecule muaj peb pawg neeg hydroxyl, thiab cov pab pawg hydroxyl ntawm cov pab pawg hydroxyl los tsim cov cellulose ether derivatives yam. Nws yog cov khoom lag luam uas cov hydrogen ntawm cov pab pawg hydroxyl hauv lub cellulose polymer tau hloov los ntawm cov pab pawg hydrocarbon. Cellulose yog polyhydroxy polymer compound uas tsis yaj tag nrho tsis yaj. Tom qab ethermalation, cellulose yog soluble hauv dej, dilute alkali daws thiab organic kuab tshuaj, thiab muaj thermoplasticity.
Cellulose yog polyhydroxy polymer compound uas tsis yaj tag nrho tsis yaj. Tom qab ethermalation, cellulose yog soluble hauv dej, dilute alkali daws thiab organic kuab tshuaj, thiab muaj thermoplasticity.
1.nature:
Lub solubility ntawm cellulose tom qab etherification hloov pauv tau. Nws tuaj yeem yaj hauv dej, dilute acid, dilute alkali lossis organic kuab tshuaj. Lub solubility tsuas yog nyob ntawm peb yam: (1) Cov yam ntxwv ntawm pawg, thiab lub zog ntawm cov lus qhia, qhov yooj yim ntawm cellulose ether yog kom yaj hauv dej; (2) Qib ntawm kev hloov pauv thiab kev faib tawm ntawm EUTETER EURED pawg hauv macromolecule. Feem ntau cov cellulose muaj neeg muaj cai tsuas yog yaj hauv dej nyob rau hauv ib tug degree hloov chaw, thiab cov degree hloov chaw nyob nruab nrab ntawm 0 thiab 3; (3) Cov qib ntawm polymerization ntawm cellulose ether, nce qib siab ntawm polymerization, tsawg soluble; Qhov qis dua qib qis dua kev hloov pauv uas tuaj yeem ua kom yaj hauv dej, qhov dav dav ntau. Muaj ntau ntau hom cellulose muaj kev hais ua ke nrog kev ua tau zoo heev, thiab lawv tau siv dav, tshuaj pleev xim, tshuaj pleev xim, hluav taws xob thiab lwm yam lag luam.
2. Tsim Tsa:
Tuam Tshoj yog lub ntiaj teb cov neeg tsim khoom loj tshaj plaws thiab cov neeg siv khoom ntawm cov cellulose ether, nrog nruab nrab kev loj hlob ib xyoos ntau dua 20%. Raws li cov kev txheeb cais ua ntej, muaj txog 50 Cellulose ntau lawm lag luam hauv kev lag luam etherpose ntau tshaj li 10,000 faib, Hebei, Chongqing thiab Jiangsu. , Zhejiang, Shanghai thiab lwm qhov chaw.
3. Xav tau:
Hauv 2011, Tuam Tshoj CMC ntau lawm yog li 300,000 tons. Nrog rau kev cog lus rau cov neeg muaj kev pab cuam siab zoo hauv cov tshuaj xws li tshuaj, thiab cov khoom siv txhua hnub, cov khoom siv txhua hnub rau cmc ntau dua. , muaj peev xwm ntau lawm ntawm MC / HPMC yog li 120,000 tons, thiab ntawm Hec yog hais txog 20,000 tons. PAC yog tseem nyob rau hauv kev tshaj tawm thiab daim ntawv thov hauv Suav teb. Nrog rau kev loj hlob ntawm cov roj loj offshore thiab kev txhim kho cov ntaub ntawv hauv tsev, tshuaj, tshuaj thiab lwm yam kev lag luam, muaj peev xwm thiab lwm lub peev xwm nthuav dav ntau tshaj 10,000 tons.
4. Kev faib tawm:
Raws li cov qauv tshuaj ua haujlwm ntawm cov neeg tuaj yeem, lawv tuaj yeem muab faib ua anionic, cationic thiab tsis muaj kev ua neej. Ua raws li cov neeg sawv cev ntawm lub nroog uas siv, cov cellulose cellulose, cellulropyl cellulose, cellulropyl hydulose, cellulropyl hydulose, cellulropyl fydulose thiab cellulose cellulose thiab cov cellulose, thiab lwm yam. Methyl Cellulose thiab Cellule yog qhov ua tau ntau dua.
Methylcellulose:
Tom qab lub r rwb rwb yog kho nrog alkali, cellulose ether yog tsim los ntawm cov kev tawm tsam nrog methane chloride li etherification tus neeg sawv cev. Feem ntau, cov qib degree hloov tau yog 1.6 ~ 2.0, thiab solubility kuj txawv degrees ntawm kev hloov pauv sib txawv. Nws zwm rau cov tsis muaj ionic cellulose ether.
(1) Methylcellulose yog soluble hauv dej txias, thiab nws yuav nyuaj rau yaj hauv dej kub. Nws cov kev daws teeb meem aqueous yog ruaj khov nyob rau hauv cov xov tooj ntawm PH = 3 ~ 12. Nws muaj qhov sib xyaw zoo nrog cov hmoov txhuv nplej siab, cov pos hniav guar, thiab lwm yam thiab ntau surfactants. Thaum qhov ntsuas kub nce mus txog qhov gelation kub, gelation tshwm sim.
(2) Cov dej tuav tseg ntawm methyl cellulose yog nyob ntawm nws cov nyiaj ntxiv, viscosity, me me thiab tus lej sib cais. Feem ntau, yog tias qhov nyiaj ntxiv yog qhov loj, lub fineness yog me me, thiab viscosity yog qhov loj, dej khaws cia siab dua yog siab. Ntawm lawv, tus nqi ntawm kev ntxiv yog qhov cuam tshuam loj tshaj plaws rau cov dej khaws nyiaj khaws cia, thiab theem viscosity tsis ncaj qha rau cov qib dej khaws nyiaj khaws cia. Qhov kev sib cais feem ntau yog nyob ntawm cov qib ntawm kev hloov kho saum npoo ntawm cov cellulose thiab particle txaus. Ntawm cov kev ua haujlwm ntawm cellulose saum toj no, methyl cellulose thiab hydroxypropyl cellulose muaj cov dej rov qab ua haujlwm dua.
(3) Kev hloov pauv hauv qhov kub tuaj yeem cuam tshuam rau cov dej rov qab ntawm methyl cellulose. Feem ntau, qhov ntsuas kub siab dua, qhov tsis zoo ntawm cov dej khaws cia. Yog tias cug cug Kub tshaj 40 ° C, cov dej tuav tseg ntawm methyl cellulose yuav raug txo qis, muaj feem xyuam rau kev tsim kho ntawm lub tshuaj khib.
(4) Methyl Cellulose muaj qhov cuam tshuam tseem ceeb rau kev ua haujlwm thiab cohesion ntawm cug. Qhov "adhesiveness" ntawm no yog hais txog kev sib raug zoo ntawm tus neeg ua haujlwm cov cuab tam thiab phab ntsa substrate, uas yog, cov shear tiv thaiv ntawm lub cug. Cov nplaum yog qhov siab, cov shear tiv thaiv ntawm cov neeg ua haujlwm yog loj, thiab lub zog ntawm cov neeg ua haujlwm ntawm cov txheej txheem yog loj, thiab kev tsim kho ntawm lub tshuaj khib yog neeg pluag. Cov cohyl ntawm methyl cellulose yog nyob rau theem nrab hauv cov khoom siv txheeb ze ether.
HydroxyPropylropylencellulose:
HydroxyPropyyl methylulose yog lub cellulose ntau nws cov zis thiab kev noj tawm zuj zus. Nws yog ib qho tsis-ionic cellulose sib xyaw ither ua los ntawm cov paj rwb tom qab kev sib dhos thiab methylene oxide thiab methyl chloride, los ntawm kev sib tw ntawm kev sib tw. Qib degree hloov chaw yog feem ntau 1.2 ~ 2.0. Nws cov khoom sib txawv nyob ntawm qhov sib piv ntawm methoxyl cov ntsiab lus rau hydroxypropyl cov ntsiab lus.
(1) HydroxyPropropy yog methylcellulose yog yooj yim soluble hauv dej txias, thiab nws yuav ntsib teeb meem hauv cov dej kub. Tab sis nws gelation kub hauv dej kub yog qhov siab dua li ntawm methyl cellulose. Lub solubility hauv dej txias kuj tseem txhim kho piv nrog methyl cellulose.
(2) Lub viscosity ntawm hydroxypropyf methylcellulose muaj feem xyuam rau nws cov molecular hnyav, thiab qhov loj dua cov molecular hnyav, ntau dua viscosity. Qhov kub kuj cuam tshuam rau nws cov viscosity, raws li kub nce ntxiv, viscosity txo. Txawm li cas los xij, tus cawv ntawm nws cov siab viscosity thiab kub yog qis dua ntawm methyl cellulose. Nws cov kev daws teeb meem yog ruaj khov thaum khaws cia ntawm chav tsev kub.
(3) Cov dej ua kom muaj zog ntawm hydroxypropylulose nyob ntawm nws tus nqi ntxiv, thiab nws cov dej khaws cia nyob rau hauv tib tus nqi yog siab dua li ntawm methyl cellulose.
(4) HydroxyPropyyl methylulose yog ruaj khov rau kua qaub thiab alkali, thiab nws cov kua aqueous yog qhov ruaj khov heev hauv cov ph = 2 ~ 12. Caustic dej qab zib thiab kua qaub muaj cov nyhuv me me rau nws cov kev ua tau zoo, tab sis alkali tuaj yeem ua rau nws qhov kev sib cais thiab me ntsis nce nws qhov viscosity. HydroxyPropyyl methylulose yog ruaj khov rau cov ntsev ua kom zoo, tab sis thaum lub hom phiaj ntawm hydroxypropen methylropylulose kev daws teeb meem.
(5) HydroxyPropropy Metylcellulose tuaj yeem sib xyaw nrog cov dej-soluble polymer sib txuas ua ke los ua cov khaub ncaws hnav thiab siab dua homphosity. Xws li cov dej cawv polyvinyl, cov hmoov txhuv nplej siab ether, zaub cov pos hniav, thiab lwm yam.
(6) HydroxyPropyyl methylcelulose muaj cov enzyme tsis tshua zoo dua li methylcellose, thiab nws cov kev daws teeb meem tsis tshua muaj kev cuam tshuam los ntawm cov enzymes dua methylculose.
(7) cov nplaum ntawm hydroxypropyl methylcellulose rau tshuaj tshuaj kho yog siab tshaj li methylcellulose.
Hydroxyethyl cellulose:
Nws yog tsim los ntawm cov paj rwb refined kho nrog alkali, thiab siv nrog ethylene oxide raws li etherification tus neeg sawv cev hauv lub xub ntiag ntawm isopropanol. Nws cov qib ntawm kev hloov pauv yog feem ntau 1.5 ~ 2.0. Nws muaj muaj zog hydrophilicity thiab yog yooj yim los nqus dej noo.
(1) Hydroxyethyl cellulose yog soluble hauv dej txias, tab sis nws yog qhov nyuaj rau yaj hauv dej kub. Nws cov kev daws teeb meem yog ruaj khov ntawm qhov kub siab tsis muaj kev sib cav. Nws tuaj yeem siv tau ntev nyob rau hauv lub siab ntev nyob rau hauv cov tshuaj khib, tab sis nws cov dej khaws cia yog qis dua ntawm methyl cellulose.
(2) hydroxyethyl cellulose yog ruaj khov rau General acid thiab alkali, thiab alkali tuaj yeem nrawm nws qhov kev sib cais thiab nce me ntsis nws qhov viscosity. Nws qhov kev tsis txaus ntseeg hauv dej yog ib qho tsis zoo me ntsis dua li methyl cellulose thiab hydroxypropyl methyl cellulose.
(3) hydroxyethyl cellulose muaj qhov zoo anti-sag kev ua haujlwm rau tshuaj khib, tab sis nws muaj sijhawm retarding ntev dua rau cov cement.
(4) Kev ua tau zoo ntawmhydroxyethyl celluloseTsim los ntawm qee cov lag luam hauv tsev yog obviously qis dua li methyl cellulose vim nws cov ntsiab lus muaj dej siab thiab cov ntsiab lus tshauv.
(5) Lub mildew ntawm cov tshuaj aquoxysethyl cellulose yog loj dua. Ntawm qhov kub txog li 40 ° C, Mildew yuav tshwm sim tsis pub dhau 3 mus rau 5 hnub, uas yuav cuam tshuam nws qhov kev ua tau zoo.
Carboxymethyl cellulose:
Lonic cellulose ether yog tsim los ntawm ntuj fibers (rwb, thiab lwm yam) Tom qab cov neeg sawv cev Alochloroacetate, thiab kev kho mob ntawm kev kho 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 li 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 raws li tuab, cov khoom siv tshuaj nplaum, cov khoom siv tshuaj ntsuab, thiab siv cov tshuaj pleev ib ce, thiab siv cov tshuaj pleev ib ce, thiab siv cov tshuaj pleev ib ce, thiab siv cov tshuaj pleev ib ce, thiab siv cov tshuaj pleev ib ce, thiab siv cov tshuaj pleev ib ce, thiab siv tshuaj pleev ib ce. Lub zog, thiab lwm yam. Ethyl cellulose cov khoom muaj siab mechanical zog, yooj yim, kub ua hauj lwm thiab txias kuj. 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, cov yeeb yaj kiab, cov tshuaj nplaum thiab lwm yam kev hloov pauv ntawm hydrting cov khoom siv sib txawv nrog cov kev hloov pauv ntawm cov khoom siv 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.
Carboxymethyl cellulose, cov lus Askiv luv cmc, 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 rau cov duab tshuaj, cov tshuaj pleev ib ce, thiab kuj yog cov nplaum rau ceramics thiab pwm.
Polyanionic cellulose (PAC) yog cov khoom ionic ether thiab yog cov khoom hloov chaw siab rau carboxymethyl cellulose (cmc). Nws yog dawb, tawm-dawb lossis me ntsis daj hmoov lossis cov tshuaj nplaum, muaj qee yam kub ua rau muaj kev sib txawv thiab cov ntsev tsis kam, thiab muaj zog tua cov khoom. 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 los ua phau binder, thickener, kua hluav taws xob, pab txhawb kev siv rau txhua tus (PAC)
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.
5.Pur kev tawm tsam cov ntsiab cai:
Lub siab α-cellulose pulp yog soaked nrog alkaline daws, thiab muaj kev rhuav tshem cov neeg sawv cev hydrogus, thiab tom qab ntawd muaj kev cuam tshuam nrog tus neeg sawv cev ntawm Ehereful kom tau txais cellulose ether. Etherifuav cov neeg sawv cev suav nrog cov tshuaj hydrocarbon (lossis sulfates), epoxides, thiab α thiab α α thiab α thiab α alltaturated tebchaw nrog hluav taws xob txais.
6.Basic Performance:
Admixtures ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev txhim kho coll cug, thiab tus account rau ntau tshaj 40% ntawm cov khoom siv hauv cov nqi sib xyaw qhuav. Ib qho kev txiav txim siab ntawm admixture hauv kev ua lag luam hauv tsev yog muab los ntawm cov chaw tsim khoom txawv teb chaws, thiab siv tshuaj txawv teb chaws, thiab cov kev siv tshuaj ntawm cov khoom yog kuj muab los ntawm tus neeg xa khoom. Raws li qhov tshwm sim, tus nqi ntawm cov khoom noj qhuav-xyaw ua ke tseem muaj siab, thiab nws nyuaj rau cov nrov cov masonry thiab plastering mortars nrog tus nqi loj thiab ntau. High-end kev lag luam khoom lag luam yog tswj hwm los ntawm cov tuam txhab txawv teb chaws, thiab cov khoom sib xyaw qhuav sib xyaw muaj cov txiaj ntsig tsis muaj txiaj ntsig; Daim ntawv thov ntawm ScsXtures tsis muaj cov kev tshawb fawb thiab kev tshawb nrhiav tau, thiab dig muag ua raws cov qauv txawv teb chaws.
Dej tuav tus neeg sawv cev yog qhov tseem ceeb admixature los txhim kho cov dej xaim ua kom huv, thiab nws tseem yog ib qho tseem ceeb confixtures kom txiav txim siab tus nqi ntawm cov khoom siv colfle. Lub ntsiab muaj nuj nqi ntawmCellulose etheryog dej khaws cia.
Cellulose ether yog ib lo lus dav dav rau cov khoom lag luam uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab tus sawv cev rau qee yam. Alkali cellulose yog hloov los ntawm cov neeg sawv cev sib txawv kom tau txais cov kws muaj kev sib txawv cellulose. Raws li Ionization cov yam ntxwv ntawm cov neeg tuaj ua haujlwm ntawm cellulose tuaj yeem muab faib ua ob pawg: ionic (xws li methyl cellulose). Raws li hom hloov chaw, ether ether tuaj yeem faib ua monether (xws li hydrothpropyl methyl cellulose). Raws li kev sib txawv solubility, nws tuaj yeem faib ua cov dej solubility (xws li hydroxyethyl cellulose (xws li Ethyl cellulose). Qhuav-mix cug feem ntau yog dej-soluble cellulose, thiab dej-soluble cellulose tau muab faib ua yam qauv tseem ceeb.
Lub tshuab ntawm kev ua ntawm cellulose ether hauv cug tshuaj yog raws li hauv qab no:
(1) Tom qab lub cellulose ether nyob rau hauv lub cape cov ntaub ntawv me me, thiab tseem muaj cov khoom siv tshuaj colle, thiab tseem muaj cov khoom siv tshuaj colle, thiab tseem muaj zog thiab cov khoom siv tshuaj pov tseg
(2) Vim nws tus kheej cov qauv molecular, lub cellulose cov tshuaj ua kom muaj kuab heev rau lub sijhawm ntev, tso cai rau lub tshuaj khib nyiab ntev, ua tiav cov dej zoo kom muaj kev tuav pov hwm thiab ua haujlwm.
Lub Sijhawm Post: Jan-10-2023