Cellulose ethersyog cov dej-soluble polymers muab tau los ntawm cellulose, uas muaj ntau tshaj polymers nyob rau hauv cov xwm.Rau ntau tshaj 60 xyoo, cov khoom siv ntau yam no tau ua lub luag haujlwm tseem ceeb hauv kev siv ntau yam, los ntawm cov khoom siv, ceramics thiab xim rau cov khoom noj, tshuaj pleev ib ce thiab tshuaj.
Rau kev tsim khoom, cellulose ethers ua cov thickeners, binders, zaj duab xis yav dhau los thiab cov dej-retention agents.Lawv kuj ua haujlwm raws li kev ncua kev pab cuam, surfactants, lubricants, tiv thaiv colloids thiab emulsifers.Tsis tas li ntawd, cov tshuaj aqueous ntawm qee cov cellulose ethers thermally gel, ib qho khoom tshwj xeeb uas ua lub luag haujlwm tseem ceeb hauv kev xav tsis thoob.
ntau yam kev siv.Qhov kev sib xyaw tseem ceeb ntawm cov khoom no tsis pom nyob hauv lwm cov dej-soluble polymer.
Qhov tseeb tias muaj ntau yam khoom muaj txiaj ntsig zoo ib txhij tam sim no thiab feem ntau ua hauv kev sib xyaw ua ke tuaj yeem yog qhov txiaj ntsig tseem ceeb ntawm kev lag luam.Hauv ntau daim ntawv thov, ob, peb lossis ntau cov khoom xyaw yuav tsum tau ua tib txoj haujlwm ua los ntawm ib qho khoom siv cellulose ether.Tsis tas li ntawd, cellulose ethers muaj txiaj ntsig zoo, feem ntau
yielding kev ua tau zoo ntawm qhov qis dua qhov xav tau nrog lwm cov dej-soluble polymers.
Dow Siv Tshuaj Siv Tshuaj muaj ntau yam khoom siv cellulosic, suav nrog methyl cellulose, hydroxyethyl cellulose thiab carboxymethyl cellulose.Methyl cellulose ethers feem ntau yog siv rau ntau daim ntawv thov hauv tsev thiab kev tsim kho kev lag luam.
Chemistry ntawm Cellulose Ethers
Peb lub lag luam muaj cellulose ethers nyob rau hauv plaub yam yooj yim:
1.Hydroxyethyl methyl cellulose (HEMC/MHEC)
2.Hydroxypropyl methyl cellulose (HPMC, MC)
3.Hydroxyethyl cellulose (HEC)
4. Carboxy methyl cellulose (CMC)
Ob qho tib si muaj cov pob txha polymeric ntawm cellulose, lub ntuj carbohydrate uas muaj cov qauv rov ua dua ntawm cov tshuaj anhydroglucose.Thaum lub sij hawm tsim cov cellulose ethers, cellulose fibers yog rhuab nrog ib tug caustic tov uas, nyob rau hauv lem, yog kho nrog methyl chloride, thiab tog twg los propylene oxide los yog ethylene oxide, yielding hydroxypropyl methyl cellulose los yog hydroxyethyl methyl cellulose, feem.Cov tshuaj tiv thaiv fibrous yog purified thiab hauv av mus rau ib qho zoo, cov hmoov zoo.
Cov khoom lag luam tshwj xeeb kuj tau tsim los ua kom tau raws li cov kev xav tau ntawm kev lag luam tshwj xeeb.
Peb cov khoom siv cellulose ether muaj nyob rau hauv peb hom sib txawv: hmoov, hmoov av-kho thiab granular.Hom ntawm cov khoom raug formulated influences uas daim ntawv xaiv.Nyob rau hauv feem ntau cov ntaub ntawv qhuav-sib xyaw, cov hmoov tsis kho feem ntau yog siv, whereas rau npaj-siv daim ntaub ntawv, nyob rau hauv uas cov cellulosic hmoov yog ntxiv ncaj qha rau dej, nto-kho hmoov los yog granular cov ntaub ntawv yog nyiam.
General Properties
Cov khoom siv dav dav rau peb cov cellulose ethers tau teev nyob ntawm no.Cov khoom lag luam tus kheej nthuav tawm cov khoom no mus rau qib sib txawv thiab tej zaum yuav muaj
additional properties desirable for specific applications. For more information, email at sales@kimachemical.com .
| Khoom | Paub meej | Qhov zoo |
| Kev khi | Siv raws li kev ua tau zoo binders rau extruded fber-cement cov ntaub ntawv | Ntsuab zog |
| Emulsifcation | Stabilize emulsions los ntawm kev txo cov nto thiab interfacial tensions thiab los ntawm | Kev ruaj ntseg |
| Zaj duab xis tsim | Daim ntawv ntshiab, tawv, yooj yim dej-soluble flms | • Kev thaiv zoo rau cov roj thiab roj |
| Lubrication | Txo kev sib txhuam hauv cov cement extrusion;txhim kho cov cuab yeej tes ua haujlwm | • Txhim kho lub twj tso kua mis ntawm cov pob zeb, tshuab grouts thiab tshuaj tsuag |
| Tsis yog | Cov khoom tsis muaj ionic nqi | • Yuav tsis complex nrog cov ntsev hlau lossis lwm hom ionic tsim |
| Solubility (organic) | Soluble nyob rau hauv binary organic thiab organic hnyav / dej systems rau xaiv hom thiab qib | Kev sib xyaw ua ke ntawm cov organic solubility thiab dej solubility |
| Solubility (dej) | • Nto kho/granular cov khoom yuav muab ntxiv ncaj qha rau aqueous | • Yooj yim ntawm dispersion thiab dissolution |
| pH stability | Stable tshaj pH ntau ntawm 2.0 txog 13.0 | • viscosity stability |
| Nto kev ua si | • Ua raws li surfactants hauv cov kua dej | • Emulsifcation |
| Kev ncua | Tswj kev daws teeb meem ntawm cov khoom siv hauv aqueous systems | • Los tiv thaiv kev sib sau ua ke lossis xim xim |
| Thermal gelation | Muaj tshwm sim rau aqueous daws ntawm methyl cellulose ethers thaum rhuab saum ib qhov kub thiab txias | • Controllable ceev-set zog Gels rov qab mus rau hauv cov tshuaj thaum txias |
| Thickening | Ntau yam ntawm qhov hnyav molecular rau thickening dej-raws li tshuab | • Ntau yam ntawm rheological profles |
| Kev tuav dej | Muaj zog dej-retention agent;khaws cov dej hauv cov txheej txheem tsim | • Ua tau zoo heev |
Cement-Based Pobzeb Adhesives
Peb cov khoom ua kom muaj kev ua tau zoo ntawm cov txheej nyias nyias ntawm cov dej tuav thiab nrog pseudoplastic rheological kev ua tau zoo.Ua tiav creamy thiab yooj yim ua haujlwm thiab sib xws, kev tuav dej siab, txhim kho ntub dej rau cov pobzeb, qhib lub sijhawm zoo thiab sijhawm hloov kho, thiab lwm yam.
Pobzeb Grouts
Cellulose ethers ua haujlwm raws li kev tuav dej thiab ncua kev pab cuam.Tshawb nrhiav kev ua haujlwm yooj yim, zoo adhesion rau cov npoo ntawm cov vuas, tsis tshua muaj shrinkage, siab abrasion tsis kam, zoo toughness thiab cohesion, thiab lwm yam.
Self-Leveling Underlayments
Cellulosics muab cov dej tuav thiab lubricity los txhim kho cov dej ntws thiab cov twj tso kua mis, txo qis kev sib cais thiab lwm yam.
Mortars rau EIFS / Skim Coat
Muab qhov zoo tshaj plaws fnishing kov nrog txhim kho kev ua haujlwm, huab cua void stabilization, adhesion, dej tuav thiab lwm yam.
Cement-Based Plasters
Muab kev ua haujlwm zoo dua los ntawm kev txhim kho sag tsis kam, ua haujlwm tau zoo, qhib lub sijhawm, huab cua-void stabilization, adhesion, dej tuav, tawm los thiab lwm yam.
Gypsum-raws li cov khoom siv hauv tsev
Xa qhov kawg xav tau ntawm tus du, txawm thiab ruaj khov nto nrog cov khoom zoo sib xws thiab cov yam ntxwv tseem ceeb.
Cement thiab Cement-Fiber Extruded Materials
Txo kev sib txhuam thiab muab lubricity los pab hauv extrusion thiab lwm yam txheej txheem.
Latex-Based Systems (Nyeem-rau-Siv)
Cov qib viscosity ntau muab kev ua haujlwm zoo, ncua solubility, qhib lub sijhawm, hloov sijhawm thiab ntau dua.
Post lub sij hawm: Nov-13-2018