Cellulose etheryog ib qho polymer compound nrog cov qauv ether ua los ntawm cellulose. Txhua lub nplhaib glucosyl nyob rau hauv cellulose macromolecule muaj peb pawg hydroxyl, thawj pawg hydroxyl ntawm lub thib rau carbon atom, pawg hydroxyl thib ob thiab thib peb carbon atoms, thiab cov hydrogen hauv pawg hydroxyl yog hloov los ntawm pawg hydrocarbon los tsim cov cellulose ether derivatives yam. Nws yog cov khoom lag luam uas cov hydrogen ntawm pawg hydroxyl hauv cellulose polymer hloov los ntawm pawg hydrocarbon. Cellulose yog polyhydroxy polymer compound uas tsis yaj los yog yaj. Tom qab etherification, cellulose yog soluble hauv dej, dilute alkali tov thiab organic hnyav, thiab muaj thermoplasticity.
Cellulose yog polyhydroxy polymer compound uas tsis yaj los yog yaj. Tom qab etherification, cellulose yog soluble hauv dej, dilute alkali tov thiab organic hnyav, thiab muaj thermoplasticity.
1. Xwm:
Solubility ntawm cellulose tom qab etherification hloov pauv loj heev. Nws tuaj yeem yaj hauv dej, dilute acid, dilute alkali lossis organic hnyav. Lub solubility feem ntau yog nyob ntawm peb yam: (1) Cov yam ntxwv ntawm cov pab pawg tau qhia nyob rau hauv cov txheej txheem etherification, kev qhia Cov pab pawg loj dua, qhov qis dua solubility, thiab muaj zog ntawm cov polarity ntawm pawg qhia, qhov yooj yim ntawm cellulose ether yog yaj hauv dej; (2) Kev hloov pauv thiab kev faib tawm ntawm pawg etherified hauv macromolecule. Feem ntau cov cellulose ethers tsuas yog yaj nyob rau hauv dej nyob rau hauv ib tug tej yam degree ntawm kev hloov, thiab cov degree ntawm kev hloov yog nyob nruab nrab ntawm 0 thiab 3; (3) Lub degree ntawm polymerization ntawm cellulose ether, siab dua cov degree ntawm polymerization, qhov tsawg soluble; Qhov qis dua qhov kev hloov pauv uas tuaj yeem yaj hauv dej, qhov dav dua. Muaj ntau hom cellulose ethers nrog kev ua tau zoo, thiab lawv tau siv dav hauv kev tsim kho, cement, roj av, khoom noj khoom haus, textile, detergent, xim, tshuaj, papermaking thiab electronics thiab lwm yam lag luam.
2. Kev tsim kho:
Tuam Tshoj yog lub ntiaj teb cov neeg tsim khoom loj tshaj plaws thiab cov neeg siv khoom ntawm cellulose ether, nrog qhov nruab nrab txhua xyoo kev loj hlob ntawm ntau tshaj 20%. Raws li kev txheeb cais ua ntej, muaj txog 50 cellulose ether ntau lawm tuam txhab nyob rau hauv Tuam Tshoj, tsim tsim muaj peev xwm ntawm cellulose ether kev lag luam tau tshaj 400,000 tons, thiab muaj txog 20 tuam txhab uas muag nrog ntau tshaj 10,000 tons, mas faib nyob rau hauv Shandong, Hebei, Chongqing thiab Jiangsu. , Zhejiang, Shanghai thiab lwm qhov chaw.
3. Xav tau:
Nyob rau hauv 2011, Tuam Tshoj lub CMC muaj peev xwm ntau lawm txog 300,000 tons. Nrog rau qhov kev thov loj zuj zus rau cov khoom lag luam zoo cellulose ethers hauv kev lag luam xws li tshuaj, khoom noj khoom haus, thiab tshuaj niaj hnub, kev thov hauv tsev rau lwm cov khoom siv cellulose ether uas tsis yog CMC yog nce. , lub peev xwm ntau lawm ntawm MC / HPMC yog kwv yees li 120,000 tons, thiab ntawm HEC yog li 20,000 tons. PAC tseem nyob rau hauv kev nce qib thiab daim ntawv thov theem hauv Suav teb. Nrog rau kev loj hlob ntawm cov roj av loj loj thiab kev tsim cov khoom siv hauv tsev, khoom noj khoom haus, tshuaj thiab lwm yam kev lag luam, cov nyiaj thiab kev lag luam ntawm PAC tau nce thiab nthuav tawm txhua xyoo, nrog lub peev xwm tsim tau ntau dua 10,000 tons.
4. Classification:
Raws li kev faib tawm cov qauv tshuaj ntawm cov neeg hloov pauv, lawv tuaj yeem muab faib ua anionic, cationic thiab nonionic ethers. Raws li tus neeg sawv cev etherification siv, muaj methyl cellulose, hydroxyethyl methyl cellulose, carboxymethyl cellulose, ethyl cellulose, benzyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose cellulose, cyanoethyl cellulose, benzyl cyanoethyl cellulose thiab carboxymethyl cellulose cellulose, thiab lwm yam Methyl cellulose thiab ethyl cellulose yog cov tswv yim ntau dua.
Methylcellulose:
Tom qab cov paj rwb refined yog kho nrog alkali, cellulose ether yog tsim los ntawm ib tug series ntawm cov tshuaj tiv thaiv nrog methane chloride ua etherification tus neeg sawv cev. Feem ntau, qhov degree ntawm kev hloov pauv yog 1.6 ~ 2.0, thiab cov solubility kuj txawv nrog ntau qib kev hloov pauv. Nws belongs rau non-ionic cellulose ether.
(1) Methylcellulose yog soluble hauv dej txias, thiab nws yuav nyuaj rau yaj hauv dej kub. Nws cov tshuaj aqueous yog ruaj khov nyob rau hauv thaj tsam ntawm pH = 3 ~ 12. Nws muaj kev sib raug zoo nrog cov hmoov txhuv nplej siab, cov pos hniav, thiab lwm yam thiab ntau surfactants. Thaum qhov kub nce mus txog qhov kub thiab txias, gelation tshwm sim.
(2) Cov dej tuav ntawm methyl cellulose nyob ntawm nws cov nyiaj ntxiv, viscosity, qhov loj me thiab qhov sib cais. Feem ntau, yog tias qhov sib ntxiv yog qhov loj, qhov zoo me me, thiab cov viscosity loj, cov dej tuav tau siab. Ntawm lawv, qhov sib ntxiv muaj qhov cuam tshuam loj tshaj plaws ntawm cov dej tuav tus nqi, thiab qib ntawm viscosity tsis ncaj qha mus rau theem ntawm cov dej tuav tus nqi. Tus nqi dissolution feem ntau yog nyob ntawm qhov kev hloov kho saum npoo ntawm cellulose hais thiab particle fineness. Ntawm cov cellulose ethers saum toj no, methyl cellulose thiab hydroxypropyl methyl cellulose muaj cov dej tuav ntau dua.
(3) Kev hloov pauv ntawm qhov kub thiab txias tuaj yeem cuam tshuam rau cov dej tuav ntawm methyl cellulose. Feem ntau, qhov kub thiab txias dua, qhov dej khaws cia tsis zoo. Yog hais tias lub mortar kub siab tshaj 40 ° C, cov dej tuav ntawm methyl cellulose yuav txo qis, cuam tshuam rau kev tsim kho ntawm mortar.
(4)Methyl cellulosemuaj qhov cuam tshuam loj rau kev ua haujlwm thiab kev sib koom ua ke ntawm mortar. Qhov "adhesiveness" ntawm no yog hais txog kev sib koom ua ke ntawm cov neeg ua haujlwm cov cuab yeej siv thiab cov phab ntsa substrate, uas yog, shear resistance ntawm lub mortar. Lub adhesiveness yog siab, shear resistance ntawm lub mortar yog loj, thiab lub zog yuav tsum tau los ntawm cov neeg ua hauj lwm nyob rau hauv tus txheej txheem ntawm kev siv kuj loj, thiab kev tsim kho ntawm lub mortar yog tsis zoo. Lub cohesion ntawm methyl cellulose yog nyob rau nruab nrab theem ntawm cellulose ether khoom.
Hydroxypropylmethylcellulose:
Hydroxypropyl methylcellulose yog ib hom cellulose uas nws cov zis thiab noj tau nce sai. Nws yog non-ionic cellulose tov ether ua los ntawm refined paj rwb tom qab alkalization, siv propylene oxide thiab methyl chloride ua etherification tus neeg sawv cev, los ntawm ib tug series ntawm cov tshuaj tiv thaiv. Qhov kev hloov pauv feem ntau yog 1.2 ~ 2.0. Nws cov khoom sib txawv nyob ntawm qhov piv ntawm cov ntsiab lus methoxyl rau hydroxypropyl cov ntsiab lus.
(1) Hydroxypropyl methylcellulose yog yooj yim soluble nyob rau hauv dej txias, thiab nws yuav ntsib teeb meem nyob rau hauv dissolving nyob rau hauv dej kub. Tab sis nws qhov kub thiab txias hauv dej kub yog siab dua li ntawm methyl cellulose. Lub solubility hauv dej txias kuj zoo heev piv nrog methyl cellulose.
(2) Lub viscosity ntawm hydroxypropyl methylcellulose muaj feem xyuam rau nws qhov hnyav molecular, thiab qhov loj dua qhov hnyav molecular, qhov viscosity siab dua. Kub kuj cuam tshuam rau nws cov viscosity, thaum kub nce, viscosity txo. Txawm li cas los xij, qhov cuam tshuam ntawm nws cov viscosity siab thiab kub yog qis dua li ntawm methyl cellulose. Nws cov tshuaj yog ruaj khov thaum khaws cia ntawm chav tsev kub.
(3) Cov dej tuav ntawm hydroxypropyl methylcellulose nyob ntawm nws qhov sib ntxiv, viscosity, thiab lwm yam, thiab nws cov dej tuav tus nqi nyob rau hauv tib qhov sib ntxiv yog siab dua li ntawm methyl cellulose.
(4)Hydroxypropyl methylcellulose yog sivNws ruaj khov rau cov kua qaub thiab alkali, thiab nws cov kua aqueous yog ruaj khov nyob rau hauv thaj tsam ntawm pH = 2 ~ 12. Caustic soda thiab txiv qaub dej tsis tshua muaj txiaj ntsig rau nws qhov kev ua tau zoo, tab sis alkali tuaj yeem ua kom nws tawg thiab ua kom nws viscosity me ntsis. Hydroxypropyl methylcellulose yog ruaj khov rau cov ntsev ntau, tab sis thaum lub concentration ntawm ntsev tov yog siab, lub viscosity ntawm hydroxypropyl methylcellulose tov nyhav nce.
(5) Hydroxypropyl methylcellulose tuaj yeem sib xyaw nrog cov dej-soluble polymer compounds los ua ib qho kev daws teeb meem thiab siab dua viscosity. Xws li polyvinyl cawv, starch ether, zaub pos hniav, thiab lwm yam.
(6) Hydroxypropyl methylcellulose muaj enzyme zoo dua li methylcellulose, thiab nws cov tshuaj tsis tshua muaj peev xwm degraded los ntawm enzymes dua methylcellulose.
(7) Qhov adhesion ntawm hydroxypropyl methylcellulose rau mortar siv yog siab dua li ntawm methylcellulose.
Hydroxyethyl cellulose:
Nws yog tsim los ntawm refined paj rwb kho nrog alkali, thiab reacted nrog ethylene oxide raws li etherification tus neeg sawv cev nyob rau hauv lub xub ntiag ntawm isopropanol. Nws qhov kev hloov pauv feem ntau yog 1.5 ~ 2.0. Nws muaj zog hydrophilicity thiab yooj yim rau nqus noo noo.
(1) Hydroxyethyl cellulose yog soluble hauv dej txias, tab sis nws nyuaj rau yaj hauv dej kub. Nws cov tshuaj yog ruaj khov ntawm qhov kub thiab txias yam tsis muaj gelling. Nws tuaj yeem siv tau ntev hauv qhov kub thiab txias hauv mortar, tab sis nws cov dej tuav qis dua li ntawm methyl cellulose.
(2) Hydroxyethyl cellulose yog qhov ruaj khov rau cov kua qaub thiab alkali, thiab alkali tuaj yeem ua rau nws tawg thiab ua kom nws cov viscosity me ntsis. Nws dispersibility hauv dej yog me ntsis phem dua li ntawm methyl cellulose thiab hydroxypropyl methyl cellulose.
(3) Hydroxyethyl cellulose muaj kev ua haujlwm zoo los tiv thaiv mortar, tab sis nws muaj sijhawm ntev dua rau cov cement.
(4) Kev ua tau zoo ntawm hydroxyethyl cellulose ua los ntawm qee lub tuam txhab hauv tsev yog pom tseeb qis dua li ntawm methyl cellulose vim nws cov ntsiab lus dej siab thiab cov hmoov tshauv siab.
(5) Cov mildew ntawm aqueous tov ntawm hydroxyethyl cellulose yog qhov hnyav heev. Ntawm qhov kub ntawm li 40 ° C, mildew tuaj yeem tshwm sim hauv 3 mus rau 5 hnub, uas yuav cuam tshuam rau nws txoj haujlwm.
Carboxymethyl cellulose:
Lonic cellulose ether yog tsim los ntawm ntuj fibers (paj rwb, thiab lwm yam) tom qab kev kho alkali, siv sodium monochloroacetate ua etherification tus neeg sawv cev, thiab tau txais kev kho 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 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 siv nyob rau hauv latex xim, luam ntawv lub sij hawm sib xyaw thiab cement ntau lawm. 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, zaj duab xis, varnishes, nplaum, latex thiab txheej cov ntaub ntawv 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 rhiab heev rau salting tawm, nce lub gelation kub thiab txhim kho kub yaj zog, thiab lwm yam. Cov degree ntawm kev hloov nyob rau hauv lub subitulk piv ntawm cov khoom saum toj no thiab lwm yam. pawg hydroxyalkyl.
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 txhawm rau ua rau alkali cellulose nrog etherification tus neeg sawv cev:hydroxyethyl cellulosenrog tus 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.
Carboxymethyl cellulose, lus Askiv abbreviation CMC, 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 ionic cellulose ether thiab yog cov khoom siv high-end 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 rau yaj hauv dej los tsim cov tshuaj pob tshab nrog qee qhov 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 nyob rau hauv lub 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.
5.Txoj kev npaj:
Lub siab α-cellulose pulp yog soaked nrog alkaline tov kom swell nws los rhuav tshem ntau hydrogen bonds, pab txhawb lub diffusion ntawm reagents thiab tsim alkali cellulose, thiab ces react nrog etherification tus neeg saib xyuas kom tau cellulose ether. Etherifying agents muaj xws li hydrocarbon halides (los yog sulfates), epoxides, thiab α thiab β unsaturated compounds nrog electron txais.
6.Basic kev ua tau zoo:
Admixtures ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm lub tsev qhuav-tso mortar, thiab suav txog ntau dua 40% ntawm cov khoom siv hauv cov tshuaj khib nyiab qhuav. Ib feem ntau ntawm cov khoom sib xyaw hauv kev lag luam hauv tsev yog muab los ntawm cov tuam txhab txawv teb chaws, thiab cov khoom siv ntawm cov khoom siv kuj yog muab los ntawm tus neeg muag khoom. Raws li qhov tshwm sim, tus nqi ntawm cov khoom siv tshuaj khib nyiab qhuav tseem tseem siab, thiab nws yog ib qho nyuaj rau kev nyiam cov masonry thiab plastering mortars nrog ntau tus nqi thiab ntau yam. Cov khoom lag luam siab kawg yog tswj hwm los ntawm cov tuam txhab txawv teb chaws, thiab cov chaw tsim khoom qhuav sib xyaw ua ke muaj cov txiaj ntsig tsawg thiab cov nqi pheej yig tsis zoo; daim ntawv thov ntawm admixtures tsis muaj kev tshawb fawb thiab tsom, thiab blindly ua raws li txawv teb chaws qauv.
Dej tuav tus neeg saib xyuas yog ib qho tseem ceeb admixture los txhim kho cov dej tuav kev ua tau zoo ntawm cov khoom sib xyaw qhuav, thiab nws kuj yog ib qho tseem ceeb ntawm cov khoom siv los txiav txim seb tus nqi ntawm cov khoom siv khib nyiab qhuav. Lub luag haujlwm tseem ceeb ntawm cellulose ether yog dej tuav.
Cellulose ether yog cov ntsiab lus dav dav rau cov khoom lag luam uas tsim los ntawm cov tshuaj tiv thaiv ntawm alkali cellulose thiab etherifying tus neeg sawv cev nyob rau hauv qee yam mob. Alkali cellulose yog hloov los ntawm cov neeg ua haujlwm sib txawv kom tau txais cov cellulose ethers sib txawv. Raws li cov khoom ionization ntawm cov khoom hloov, cellulose ethers tuaj yeem muab faib ua ob pawg: ionic (xws li carboxymethyl cellulose) thiab nonionic (xws li methyl cellulose). Raws li hom kev hloov pauv, cellulose ether tuaj yeem muab faib ua monoether (xws li methyl cellulose) thiab sib xyaw ether (xws li hydroxypropyl methyl cellulose). Raws li qhov sib txawv solubility, nws tuaj yeem muab faib ua dej solubility (xws li hydroxyethyl cellulose) thiab organic solvent solubility (xws li ethyl cellulose). Qhuav-sib xyaw mortar feem ntau yog dej-soluble cellulose, thiab dej-soluble cellulose muab faib ua hom instant thiab deg-kho ncua-dissolution hom.
Lub mechanism ntawm kev txiav txim ntawm cellulose ether nyob rau hauv mortar yog raws li nram no:
(1) Tom qab ntawvcellulose etherNyob rau hauv lub mortar yog yaj nyob rau hauv dej, qhov zoo thiab niaj hnub faib ntawm cov cementitious cov ntaub ntawv nyob rau hauv lub system yog guaranteed vim lub nto kev ua si, thiab cellulose ether, raws li ib tug tiv thaiv colloid, "wraps" cov khoom hais thiab ib txheej ntawm lubricating zaj duab xis yog tsim nyob rau hauv nws txheej txheej, uas ua rau lub mortar system ruaj khov, thiab kuj txhim kho cov fluidity ntawm cov txheej txheem sib tov.
(2) Vim nws tus kheej cov qauv molecular, cov tshuaj cellulose ether ua rau cov dej noo hauv cov khib nyiab tsis yooj yim ploj, thiab maj mam tso tawm rau lub sijhawm ntev, ua rau cov mortar nrog dej tuav thiab ua haujlwm tau zoo.
Lub sij hawm xa tuaj: Plaub Hlis-28-2024