1. Txheej txheem cej luam:
Cellulose ether yog lub ntuj polymer compound, nws cov qauv tshuaj yog polysaccharide macromolecule raws li anhydrous β-glucose, thiab muaj ib pawg thawj hydroxyl thiab ob pawg hydroxyl theem nrab ntawm txhua lub nplhaib. Los ntawm kev hloov kho tshuaj, cov khoom siv cellulose tuaj yeem tau txais, thiab cellulose ether yog ib qho ntawm lawv. Cellulose ether yog cov khoom siv polymer nrog cov qauv ether ua los ntawm cellulose, xws li methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, thiab lwm yam. Feem ntau, nws tuaj yeem tau txais los ntawm kev ua ntawm alkali cellulose thiab monochloroalkane, ethylene oxide. , propylene oxide los yog monochloroacetic acid.
2. Kev ua tau zoo thiab nta:
(1) Cov yam ntxwv zoo
Cellulose ether feem ntau yog dawb los yog milky dawb, tsis muaj ntxhiab, tsis muaj tshuaj lom, kua dej fiber ntau hmoov, yooj yim nqus dej, thiab yaj mus rau hauv pob tshab khov kho colloid hauv dej.
(2) Zaj duab xis tsim thiab adhesion
Lub etherification ntawm cellulose ether muaj kev cuam tshuam zoo rau nws cov yam ntxwv thiab kev ua tau zoo, xws li solubility, film-forming peev xwm, daim ntawv cog lus lub zog thiab ntsev tsis kam. Cellulose ether muaj zog txhua yam, yoog raws, ua haujlwm kub thiab txias, thiab muaj kev sib raug zoo nrog ntau yam resins thiab plasticizers, thiab tuaj yeem siv los ua plastics, films, varnishes, adhesives, latex thiab tshuaj txheej cov ntaub ntawv, thiab lwm yam.
(3) Solubility
Methylcellulose yog soluble hauv dej txias, insoluble hauv dej kub, thiab tseem soluble hauv qee cov organic solvents; methyl hydroxyethyl cellulose yog soluble hauv dej txias, insoluble hauv dej kub thiab cov kuab tshuaj organic. Txawm li cas los xij, thaum lub aqueous tov ntawm methylcellulose thiab methylhydroxyethylcellulose yog rhuab, methylcellulose thiab methylhydroxyethylcellulose yuav precipitate. Methylcellulose precipitates ntawm 45-60 ° C, thaum nag lossis daus kub ntawm mixed etherified methyl hydroxyethyl cellulose nce mus rau 65-80 ° C. Thaum qhov kub thiab txias yog qis, lub precipitate redissolves. Hydroxyethyl cellulose thiab sodium carboxymethyl hydroxyethyl cellulose yog soluble hauv dej ntawm qhov kub thiab txias thiab insoluble hauv cov kuab tshuaj organic.
(4) thickening
Cellulose ether yaj hauv dej hauv daim ntawv colloidal, thiab nws cov viscosity nyob ntawm qhov degree ntawm polymerization ntawm cellulose ether. Cov tshuaj muaj hydrated macromolecules. Vim yog qhov sib txuam ntawm macromolecules, tus cwj pwm ntws ntawm cov kev daws teeb meem sib txawv ntawm cov kua Newtonian, tab sis nthuav tawm tus cwj pwm uas hloov pauv nrog kev hloov ntawm lub zog shear. Vim yog cov qauv macromolecular ntawm cellulose ether, viscosity ntawm cov tshuaj nce sai nrog qhov nce ntawm cov concentration thiab txo qis nrog qhov kub thiab txias.
Daim ntawv thov
(1) Petroleum kev lag luam
Sodium carboxymethyl cellulose feem ntau yog siv rau hauv cov roj extraction, thiab nws yog siv rau hauv kev tsim cov av nkos kom viscosity thiab txo cov dej poob. Nws tuaj yeem tiv taus ntau yam kuab paug ntsev thiab ua kom cov roj rov qab. Sodium carboxymethyl hydroxypropyl cellulose (NaCMHPC) thiab sodium carboxymethyl hydroxyethyl cellulose (NaCMHEC) yog cov zoo drilling av nkos cov neeg ua haujlwm thiab cov ntaub ntawv rau kev npaj cov kua tiav, nrog rau cov slurrying siab thiab ntsev tsis kam, zoo anti-calcium kev ua tau zoo, zoo viscosity-nce muaj peev xwm, kub tsis kam. (160 ℃) khoom. Nws yog tsim rau kev npaj drilling kua rau cov dej tshiab, dej hiav txwv thiab dej ntsev saturated. Nws tuaj yeem tsim rau hauv cov kua dej drilling ntawm ntau qhov ntom ntom (103-127g / cm3) hauv qab qhov hnyav ntawm calcium chloride, thiab nws muaj qee yam viscosity thiab cov kua dej tsis tshua muaj, nws muaj peev xwm nce ntxiv thiab cov kua dej poob qis dua li hydroxyethyl cellulose. , thiab nws yog ib tug zoo additive rau nce roj ntau lawm.
Sodium carboxymethyl cellulose yog cellulose derivative dav siv nyob rau hauv cov txheej txheem ntawm cov roj extraction. Nws yog siv nyob rau hauv drilling kua, cementing kua, fracturing kua thiab txhim kho cov roj rov qab, tshwj xeeb tshaj yog nyob rau hauv drilling kua. Nws tsuas yog ua lub luag haujlwm ntawm kev txo cov kua dej thiab nce viscosity. Hydroxyethyl cellulose (HEC) yog siv los ua cov av nkos thickening thiab stabilizing tus neeg sawv cev nyob rau hauv cov txheej txheem ntawm drilling, zoo tiav thiab cementing. Piv nrog sodium carboxymethyl cellulose thiab guar gum, hydroxyethyl cellulose muaj cov nyhuv thickening zoo, muaj zog xuab zeb ncua kev kawm ntawv, siab ntsev muaj peev xwm, zoo tshav kub tsis kam, me me mixing kuj, tsawg kua poob, thiab gel tawg. Thaiv, tsis tshua muaj residue thiab lwm yam ntxwv, tau dav siv.
(2) Kev tsim kho thiab xim kev lag luam
Sodium carboxymethyl cellulose tuaj yeem siv los ua cov tshuaj tiv thaiv, dej tuav tus neeg saib xyuas, thickener thiab binder rau lub tsev masonry thiab plastering mortar admixtures, thiab tuaj yeem siv los ua plaster, mortar thiab av leveling cov ntaub ntawv rau gypsum puag thiab cement puag Nws yog siv los ua dispersant, dej. tuav tus neeg sawv cev thiab thickener. Ib qho tshwj xeeb masonry thiab plastering mortar admixture ua los ntawm carboxymethyl cellulose, uas tuaj yeem txhim kho kev ua haujlwm, dej tuav thiab tawg tsis kam ntawm cov mortar, thiab tsis txhob tawg thiab voids ntawm phab ntsa thaiv. nruas. Lub tsev kho kom zoo nkauj cov ntaub ntawv Cao Mingqian thiab lwm tus ua rau ib puag ncig tus phooj ywg lub tsev kho kom zoo nkauj khoom siv los ntawm methyl cellulose. Cov txheej txheem ntau lawm yog yooj yim thiab huv si. Nws tuaj yeem siv rau qib siab phab ntsa thiab pob zeb pob zeb nto, thiab tuaj yeem siv rau kev kho kom zoo nkauj ntawm kab thiab monuments.
(3) Kev lag luam tshuaj txhua hnub
Lub stabilizing viscosifier sodium carboxymethyl cellulose plays lub luag hauj lwm ntawm dispersion thiab ncua kev kawm ntawv stabilization nyob rau hauv cov muab tshuaj txhuam cov khoom raw cov ntaub ntawv, thiab plays lub luag hauj lwm ntawm thickening, dispersing thiab homogenizing nyob rau hauv kua los yog emulsion tshuaj pleev ib ce. Nws tuaj yeem siv los ua tus stabilizer thiab tackifier. Emulsion stabilizers yog siv los ua emulsifiers, thickeners thiab stabilizers rau cov tshuaj pleev thiab tshuaj zawv plaub hau.Sodium carboxymethyl hydroxypropyl cellulosetuaj yeem siv los ua tus stabilizer rau cov tshuaj txhuam hniav adhesives. Nws muaj cov khoom zoo thixotropic, uas ua rau cov tshuaj txhuam hniav zoo nyob rau hauv formability, lub sij hawm ntev cia yam tsis muaj deformation, thiab uniform thiab ilv saj. Sodium carboxymethyl hydroxypropyl cellulose muaj cov ntsev zoo dua thiab acid tsis kam, thiab nws cov txiaj ntsig zoo dua li ntawm carboxymethyl cellulose. Nws tuaj yeem siv los ua cov thickener hauv cov tshuaj ntxuav tes thiab cov tshuaj tiv thaiv kab mob. Dispersion thickener hauv kev tsim cov tshuaj detergents, sodium carboxymethylcellulose feem ntau yog siv los ua cov av dispersant rau ntxuav hmoov, thickener thiab dispersant rau cov kua detergents.
(4) Kev lag luam tshuaj thiab zaub mov
Hauv kev lag luam kws tshuaj, hydroxypropyl carboxymethylcellulose (HPMC) tuaj yeem siv los ua cov tshuaj excipient, dav siv nyob rau hauv qhov ncauj tshuaj matrix tswj kev tso tawm thiab txhawb kev tso tawm, raws li kev tso tawm retarding cov ntaub ntawv los tswj cov kev tso tawm ntawm cov tshuaj, raws li ib tug txheej txheej rau ncua kev tso tawm. formulations, ncua-tso pellets, ncua-tso capsules. Feem ntau siv yog methyl carboxymethyl cellulose thiab ethyl carboxymethyl cellulose, xws li MC, uas feem ntau yog siv los ua cov ntsiav tshuaj thiab cov tshuaj ntsiav, los yog cov tshuaj nplaum nplaum nplaum. Premium qib cellulose ethers tuaj yeem siv rau hauv kev lag luam khoom noj khoom haus, thiab yog cov thickeners zoo, stabilizers, excipients, dej tuav cov neeg ua hauj lwm thiab cov neeg kho tshuab foaming agents hauv ntau yam khoom noj. Methyl cellulose thiab hydroxypropyl methyl cellulose tau lees paub tias yog lub cev tsis muaj teeb meem metabolic inert tshuaj. High-purity (tshaj li 99.5%) carboxymethylcellulose (CMC) tuaj yeem muab ntxiv rau hauv cov khoom noj, xws li mis nyuj thiab qab zib cov khoom, condiments, jams, jelly, kaus poom zaub mov, rooj syrup thiab dej haus. Carboxymethyl cellulose nrog purity ntau dua 90% tuaj yeem siv rau hauv cov khoom noj, xws li kev thauj mus los thiab khaws cov txiv hmab txiv ntoo tshiab. Cov hnab yas zoo li no muaj qhov zoo ntawm cov nyhuv tshiab zoo, muaj kuab paug tsawg, tsis muaj kev puas tsuaj, thiab kev siv tshuab yooj yim.
(5) Cov khoom siv kho qhov muag thiab hluav taws xob
Electrolyte thickening stabilizer muaj siab purity ntawm cellulose ether, zoo acid kuj thiab ntsev tsis kam, tshwj xeeb tshaj yog tsis muaj hlau thiab hnyav hlau cov ntsiab lus, yog li cov colloid yog heev ruaj khov, haum rau alkaline roj teeb, zinc-manganese roj teeb Electrolyte thickening stabilizer. Ntau cov cellulose ethers muaj cov thermotropic kua crystallinity. Hydroxypropyl cellulose acetate ua cov thermotropic cholesteric kua crystals hauv qab 164 ° C.
Post lub sij hawm: Jan-12-2023