Txheej txheem cej luam
Cellulose yog lub ntuj polymer tsim los ntawm anhydrous β-glucose units, thiab nws muaj peb pawg hydroxyl ntawm txhua lub nplhaib.Los ntawm kev hloov kho cellulose, ntau yam cellulose derivatives tuaj yeem tsim tau, thiab ib qho ntawm lawv yog cellulose ether.Cellulose ether yog cov khoom siv polymer nrog cov qauv ether tau los ntawm cellulose, suav nrog methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, carboxymethyl cellulose, thiab lwm yam.Cov derivatives no feem ntau yog tsim los ntawm reacting alkali cellulose nrog monochloroalkane, ethylene oxide, propylene oxide, los yog monochloroacetic acid.Cov txiaj ntsig ntawm cellulose ether muaj cov dej solubility zoo heev, muaj peev xwm ua kom tuab, thiab cov khoom ua yeeb yaj kiab, thiab nws tau siv dav hauv kev lag luam xws li kev tsim kho, tshuaj, khoom noj, thiab tshuaj pleev ib ce.Cellulose ether yog ib qho khoom siv txuas ntxiv dua tshiab, biodegradable, thiab tsis muaj tshuaj lom, ua rau nws yog lwm txoj hauv kev rau hluavtaws polymers.
Kev ua tau zoo thiab nta
1. Cov yam ntxwv zoo
Cellulose ether yog cov hmoov dawb, tsis muaj ntxhiab, fibrous hmoov uas yooj yim absorbs noo noo thiab tsim ib qho ruaj khov, khov, pob tshab colloid thaum yaj hauv dej.
2. Zaj duab xis tsim thiab Adhesion
Kev hloov tshuaj lom neeg ntawm cellulose los tsim cov cellulose ether cuam tshuam rau nws cov khoom, nrog rau nws cov solubility, muaj peev xwm tsim cov yeeb yaj kiab, daim ntawv cog lus lub zog, thiab ntsev tsis kam.Cov yam ntxwv no ua rau cellulose ether yog ib qho kev xav tau zoo heev polymer nrog zoo heev txhua yam muaj zog, yooj, kub tsis kam, thiab txias kuj.Tsis tas li ntawd, nws muaj kev sib raug zoo nrog ntau yam resins thiab plasticizers, ua rau nws tsim nyog siv rau hauv kev tsim cov plastics, films, varnishes, adhesives, latex, thiab tshuaj txheej cov ntaub ntawv.Vim nws cov khoom siv ntau yam, cellulose ether tau dhau los ua cov khoom tseem ceeb hauv kev tsim khoom, muab kev ua tau zoo, ruaj khov, thiab ua haujlwm ntev rau ntau yam khoom.Raws li qhov tshwm sim, nws muaj ntau yam kev siv hauv ntau qhov chaw, suav nrog tshuaj, txheej, textiles, kev tsim kho, thiab kev lag luam zaub mov, thiab lwm yam.
3. Solubility
Solubility ntawm cellulose ethers xws li methylcellulose, methyl hydroxyethyl cellulose, hydroxyethyl cellulose, thiab sodium carboxymethyl hydroxyethyl cellulose txawv nyob ntawm qhov kub thiab txias siv.Methylcellulose thiab methyl hydroxyethyl cellulose yog soluble hauv dej txias thiab qee cov kuab tshuaj organic tab sis precipitate thaum rhuab, nrog methylcellulose precipitating ntawm 45-60 ° C thiab cov etherified methyl hydroxyethyl cellulose ntawm 65-80 ° C.Txawm li cas los xij, cov precipitates tuaj yeem rov ua dua thaum qhov kub qis dua.Ntawm qhov tod tes, hydroxyethyl cellulose thiab sodium carboxymethyl hydroxyethyl cellulose yog dej-soluble ntawm txhua qhov kub tab sis insoluble hauv cov kuab tshuaj organic.Cov cellulose ethers no muaj qhov sib txawv ntawm solubility thiab nag lossis daus uas ua rau lawv haum rau ntau yam kev siv hauv kev lag luam xws li plastics, films, coatings, thiab adhesives.
4. Thickening
Thaum cellulose ether yaj hauv dej, nws tsim cov tshuaj colloidal uas nws viscosity cuam tshuam los ntawm qib ntawm polymerization ntawm cellulose ether.Cov tshuaj muaj hydrated macromolecules uas qhia tsis yog-Newtonian tus cwj pwm, piv txwv li, tus cwj pwm ntws hloov nrog lub zog shear siv.Vim yog cov qauv macromolecular, viscosity ntawm cov tshuaj nce sai nrog cov concentration, tab sis txo qis nrog qhov kub thiab txias.Lub viscosity ntawm cellulose ether daws kuj cuam tshuam los ntawm pH, ionic zog, thiab muaj lwm yam tshuaj.Cov khoom tshwj xeeb ntawm cellulose ether ua rau nws muaj txiaj ntsig zoo hauv ntau daim ntawv thov xws li nplaum, txheej, tshuaj pleev ib ce, thiab khoom noj khoom haus.
Daim ntawv thov
1. Kev lag luam roj av
Sodium carboxymethyl cellulose (NaCMC) yog cellulose ether nrog ntau yam kev siv hauv cov txheej txheem roj extraction.Nws zoo heev viscosity-nce thiab kua poob txo cov khoom ua rau nws yog ib qho kev xaiv nrov hauv cov dej drilling, cementing kua, thiab fracturing kua.Tshwj xeeb, nws tau pom cov txiaj ntsig tau zoo hauv kev txhim kho cov roj rov qab.NaCMC tuaj yeem tiv taus ntau cov kua ntsev uas muaj kuab paug thiab ua kom cov roj rov qab los ntawm kev txo cov dej poob, thiab nws cov ntsev tsis kam thiab muaj peev xwm nce ntxiv ua rau nws zoo tagnrho rau kev npaj cov kua dej rau cov dej tshiab, dej hiav txwv, thiab dej ntsev saturated.
Sodium carboxymethyl hydroxypropyl cellulose (NaCMHPC) thiab sodium carboxymethyl hydroxyethyl cellulose (NaCMHEC) yog ob lub cellulose ether derivatives nrog siab slurrying tus nqi, zoo anti-calcium kev ua tau zoo, thiab zoo viscosity-nce muaj peev xwm, ua rau lawv zoo heev xaiv raws li cov ntaub ntawv drilling av nkos. npaj cov kua ua kom tiav.Lawv muaj peev xwm ua kom muaj viscosity-ua kom muaj peev xwm thiab cov kua dej poob qis dua piv rau hydroxyethyl cellulose, thiab lawv lub peev xwm los tsim cov kua dej ntawm ntau qhov ntom ntom hauv qab qhov hnyav ntawm calcium chloride ua rau lawv muaj ntau yam ntxiv rau kev tsim cov roj.
Hydroxyethyl cellulose (HEC) yog lwm cov cellulose derivative siv los ua cov av nkos thickening thiab stabilizing tus neeg sawv cev hauv kev drilling, ua tiav, thiab cementing txheej txheem.Piv rau sodium carboxymethyl cellulose thiab guar gum, HEC muaj zog xuab zeb ncua kev kawm ntawv, siab ntsev muaj peev xwm, zoo thaum tshav kub kub tsis kam, tsis muaj mixing kuj, tsawg poob kua, thiab gel tawg thaiv.HEC tau siv dav vim nws cov nyhuv thickening zoo, qis residue, thiab lwm yam khoom.Zuag qhia tag nrho, cellulose ethers zoo li NaCMC, NaCMHPC, NaCMHEC, thiab HEC ua lub luag haujlwm tseem ceeb hauv cov txheej txheem roj rho tawm thiab tau pom muaj peev xwm tseem ceeb hauv kev txhim kho cov roj rov qab.
2. Kev tsim kho thiab xim kev lag luam
Sodium carboxymethyl cellulose yog cov khoom siv hauv tsev ntau yam ntxiv uas tuaj yeem siv los ua cov tshuaj tiv thaiv, dej tuav tus neeg saib xyuas, thickener thiab khi rau lub tsev masonry thiab plastering mortar.Nws kuj tseem tuaj yeem siv los ua cov khoom tawg, dej tuav cov neeg sawv cev thiab cov thickener rau plaster, mortar thiab av leveling cov ntaub ntawv.Ib qho tshwj xeeb masonry thiab plastering mortar admixture ua los ntawm carboxymethyl cellulose tuaj yeem txhim kho kev ua haujlwm, tuav dej thiab ua kom tawg, tsis txhob tawg thiab voids hauv phab ntsa thaiv.Tsis tas li ntawd, methyl cellulose tuaj yeem siv los ua ib puag ncig tus phooj ywg lub tsev kho kom zoo nkauj cov ntaub ntawv rau qib siab phab ntsa thiab pob zeb pob zeb, nrog rau kev kho kom zoo nkauj ntawm kab thiab monuments.
3. Kev lag luam tshuaj txhua hnub
Sodium carboxymethyl cellulose yog ntau yam stabilizing viscosifier uas tuaj yeem siv rau ntau yam khoom.Hauv cov khoom siv tshuaj pleev ib ce uas muaj cov hmoov txhuv nplej siab, nws ua lub luag haujlwm tseem ceeb hauv kev cuam tshuam thiab kev ncua kev ruaj ntseg.Rau cov kua los yog emulsion tshuaj pleev ib ce, nws ua hauj lwm raws li ib tug thickening, dispersing, thiab homogenizing tus neeg sawv cev.Cov cellulose derivative no tuaj yeem ua raws li emulsion stabilizer, tshuaj pleev thiab tshuaj zawv plaub hau thickener thiab stabilizer, tshuaj txhuam hniav adhesive stabilizer, thiab detergent thickener thiab anti-stain agent.Sodium carboxymethyl hydroxypropyl cellulose, ib hom cellulose ether, yog dav siv los ua cov tshuaj txhuam hniav stabilizer vim nws cov khoom thixotropic, uas pab tswj cov tshuaj txhuam hniav formability thiab sib xws.Cov derivative no tseem tiv taus ntsev thiab kua qaub, ua rau nws ua haujlwm zoo hauv cov tshuaj detergents thiab cov tshuaj tiv thaiv kab mob.Sodium carboxymethyl cellulose feem ntau yog siv los ua cov av dispersant, thickener, thiab dispersant nyob rau hauv zus tau tej cov hmoov ntxhua thiab kua detergents.
4. Kev lag luam tshuaj thiab zaub mov
Hauv kev lag luam kws tshuaj, Yibang hydroxypropyl carboxymethylcellulose (HPMC) tau dav siv los ua cov tshuaj ntxiv rau qhov ncauj tshuaj tswj kev tso tawm thiab kev npaj tso tawm.Nws ua raws li kev tso tawm retarding cov ntaub ntawv los tswj cov kev tso tawm ntawm cov tshuaj, thiab raws li ib tug txheej txheej rau ncua kev tso tawm formulations.Methyl carboxymethyl cellulose thiab ethyl carboxymethyl cellulose feem ntau yog siv los ua cov ntsiav tshuaj thiab cov tshuaj ntsiav, lossis los ua cov ntsiav tshuaj uas muaj suab thaj.Hauv kev lag luam khoom noj khoom haus, qib premium cellulose ethers yog cov thickeners zoo, stabilizers, excipients, dej tuav cov neeg ua haujlwm thiab cov neeg kho tshuab foaming hauv ntau yam khoom noj.Methylcellulose thiab hydroxypropylmethylcellulose yog suav tias yog metabolically inert thiab muaj kev nyab xeeb rau kev noj.High-purity carboxymethylcellulose tuaj yeem muab ntxiv rau cov khoom noj khoom haus, suav nrog mis nyuj thiab qab zib, condiments, jams, jelly, zaub mov kaus poom, rooj syrup, thiab dej haus.Tsis tas li ntawd, carboxymethyl cellulose tuaj yeem siv rau hauv kev thauj mus los thiab khaws cov txiv hmab txiv ntoo tshiab raws li lub hnab yas, muab cov nyhuv tshiab zoo, tsis muaj kuab paug, tsis muaj kev puas tsuaj, thiab kev siv tshuab yooj yim.
5. Cov khoom siv kho qhov muag thiab hluav taws xob
Lub high-purity cellulose ether nrog zoo acid thiab ntsev kuj ua raws li ib tug electrolyte thickening stabilizer, muab ruaj khov colloidal zog rau alkaline thiab zinc-manganese roj teeb.Qee cov cellulose ethers tso cov thermotropic kua crystallinity, xws li hydroxypropyl cellulose acetate, uas tsim cov kua roj cholesterol hauv qab 164 ° C.
Main Reference
● Dictionary of Chemical Substances.
● Cov yam ntxwv, kev npaj thiab kev lag luam thov ntawm cellulose ether.
● Status Quo thiab Kev Txhim Kho Kev Lag Luam ntawm Cellulose Ether Market.
