HPMC hauv pobzeb Adhesives

Tua ilenplaumcoob tus neeg kuj hu ua ceramiccov nplaum nplaum, cov neeg uas tau hu rau kev siv cov pobzeb ceramicnplaumrau nws lub nruas los tiv thaiv, nplaum, kev tsim kho, kev laus ua haujlwm thiab lwm yam zoo yog lees paub kiag li.

Cellulose etherHPMCraws li qhov tseem ceeb tshaj plaws additive nyob rau hauvcov nplaum nplaum, cov nplaum nplaumrub lub zog thiab qhib lub sijhawm muaj kev cuam tshuam zoo, thiab ob yam khoom no kuj yog qhov tseem ceeb ntawm kev ua haujlwm siabcov nplaum nplaum, los ntawm kev sim ntawm cellulose ether cuam tshuam raucov nplaum nplaumCov khoom tau muab sau tseg thiab tshuaj xyuas.

1, lub npe

Cement-raws li ceramiccov nplaum nplaumTam sim no yog daim ntawv thov loj tshaj plaws ntawm kev sib xyaw tshwj xeeb qhuav mortar, uas yog ib yam ntawm cov cement ua cov khoom siv cementing tseem ceeb thiab ntxiv los ntawm kev sib sau ua ke, dej tuav tus neeg saib xyuas, tus neeg sawv cev thaum ntxov, latex hmoov thiab lwm yam organic lossis inorganic admixtures. Feem ntau tsuas yog siv nrog cov dej sib xyaw, piv nrog cov cement mortar zoo tib yam, tuaj yeem txhim kho lub zog sib txuas ntawm cov khoom tiav thiab cov khoom siv hauv paus, muaj kev tiv thaiv zoo thiab muaj dej zoo heev, tiv thaiv tshav kub thiab khov-thawing voj voog zoo, feem ntau yog siv. rau pasting lub tsev sab hauv thiab sab nrauv phab ntsa vuas, pem teb vuas thiab lwm yam ntaub ntawv kho kom zoo nkauj, Nws yog dav siv nyob rau hauv kho kom zoo nkauj ntawm phab ntsa, pem teb, chav dej, chav ua noj thiab lwm lub tsev. Nws yog cov khoom siv dav siv ntau tshaj plaws ceramic pobzeb bonding khoom.

Feem ntau thaum peb txiav txim qhov kev ua tau zoo ntawm ceramiccov nplaum nplaum, ntxiv rau kev them nyiaj rau nws cov kev ua haujlwm kev ua haujlwm, muaj peev xwm tiv thaiv zawv zawg, tab sis kuj xyuam xim rau nws cov khoom siv dag zog thiab lub sijhawm qhib. Cellulose ether hauv ceramiccov nplaum nplaumNtxiv rau qhov cuam tshuam rau cov khoom rheological ntawm porcelain kua nplaum, xws li kev ua haujlwm du, qhov teeb meem ntawm rab riam, tab sis kuj tseem nyob ntawm cov khoom siv ntawm ceramic.cov nplaum nplaummuaj kev cuam tshuam.

2, kev cuam tshuam ntawm lub sijhawm qhib ntawm ceramiccov nplaum nplaum

Thaum cov hmoov roj hmab thiab cov cellulose ether sib koom ua ke hauv cov khib nyiab ntub dej, qee cov ntaub ntawv qauv qhia tias cov hmoov roj hmab muaj zog kinetic zog los ua raws li cov khoom siv cement hydration, thiab cellulose ether muaj ntau nyob rau hauv cov kua dej sib txawv, uas cuam tshuam rau viscosity thiab teem sij hawm ntawm mortar. ntau. Qhov nro ntawm cellulose ether yog loj dua li ntawm cov hmoov roj hmab, thiab kev ua kom muaj ntau ntawm cellulose ether ntawm mortar interface yog qhov zoo rau kev tsim cov hydrogen bonds ntawm lub hauv paus dav hlau thiab cellulose ether.

Moisture evaporation los ntawm hauv cov khib nyiab ntub dej, mortar, cellulose ether nyob rau hauv qhov chaw enrichment, 5 feeb tuaj yeem tsim ib daim nyias nyias ntawm cov mortar, yuav txo cov evaporation tus nqi ntawm kev soj ntsuam, nrog dej ntau los ntawm slurry tuab ib feem ntawm cov evaporation. txav mus rau hauv mortar txheej yog thinner, qhib cov ntsiab lus ib nrab yaj thaum pib tsim ntawm daim nyias nyias, kev tsiv teb tsaws ntawm cov dej tuaj yeem nqa ntau ntxiv ntawm cellulose ether nyob rau hauv mortar ntawm qhov chaw.

Yog li, cellulose ether zaj duab xis tsim nyob rau saum npoo ntawm mortar muaj kev cuam tshuam zoo rau kev ua haujlwm ntawm mortar, 1) cov yeeb yaj kiab tsim yog nyias dhau, yuav yaj ob zaug, tsis tuaj yeem txwv cov evaporation ntawm dej, txo lub zog. 2) cov zaj duab xis tsim yog tuab heev, qhov concentration ntawm cellulose ether nyob rau hauv slurry clearance kua yog siab, thiab viscosity yog loj. Thaum cov pobzeb ceramic yog pasted, nws tsis yooj yim rau tawg zaj duab xis ntawm qhov chaw. Nws tuaj yeem pom tias cov yeeb yaj kiab tsim kev ua haujlwm ntawm cellulose ether muaj kev cuam tshuam zoo rau lub sijhawm qhib. Hom cellulose ether (HPMC, HEMC, MC, thiab lwm yam) thiab degree ntawm etherification (degree ntawm kev hloov) ncaj qha cuam tshuam rau cov zaj duab xis tsim kev ua tau zoo ntawm cellulose ether, mus rau hardness thiab toughness ntawm zaj duab xis.

3, lub zog ntawm kev kos duab

Cellulose ether tsis tsuas yog endows mortar nrog rau tag nrho cov saum toj no cov khoom muaj txiaj ntsig, tab sis kuj ncua cov dej kinetics ntawm cov cement. Qhov kev cuam tshuam tsis zoo no feem ntau yog vim qhov adsorption ntawm cellulose ether molecules ntawm ntau theem ntxhia hauv cov cement system tau hydrated, tab sis nws feem ntau pom zoo tias cellulose ether molecules feem ntau yog adsorbed ntawm cov khoom siv dej xws li CSH thiab calcium hydroxide, thiab tsis tshua muaj adsorbed ntawm thawj cov ntxhia theem ntawm clinker. Tsis tas li ntawd, cellulose ether txo cov ions (Ca2+, SO42-, ...) vim muaj qhov viscosity ntawm pore daws. Kev ua hauv pore tov, uas ntxiv retards cov txheej txheem hydration.

Viscosity yog lwm qhov tseem ceeb, uas sawv cev rau cov tshuaj lom neeg ntawm cellulose ether. Raws li tau hais los saum no, viscosity feem ntau cuam tshuam rau lub peev xwm khaws dej, thiab tseem muaj feem cuam tshuam rau kev ua haujlwm ntawm cov tshuaj khib nyiab tshiab. Txawm li cas los xij, txoj kev tshawb fawb tau pom tias cov viscosity ntawm cellulose ether yuav luag tsis muaj kev cuam tshuam rau hydration kinetics ntawm cement. Qhov hnyav Molecular muaj me ntsis cuam tshuam rau hydration, thiab qhov sib txawv loj tshaj plaws ntawm qhov sib txawv molecular hnyav tsuas yog 10min. Yog li ntawd, molecular hnyav tsis yog qhov tseem ceeb parameter los tswj cov cement hydration.

Lub retardation ntawm cellulose ether nyob ntawm nws cov qauv tshuaj. Cov qauv dav dav yog tias rau MHEC, qhov siab dua ntawm cov tshuaj methylation, qhov me dua qhov cuam tshuam ntawm cellulose ether. Tsis tas li ntawd, kev hloov pauv hydrophilic (xws li hloov HEC) muaj qhov cuam tshuam zoo dua li kev hloov pauv hydrophobic (xws li hloov ntawm MH, MHEC thiab MHPC). Cov nyhuv retarding ntawm cellulose ether yog feem ntau cuam tshuam los ntawm ob qhov tsis muaj hom thiab tus naj npawb ntawm cov pab pawg hloov.

Peb qhov kev sim ua haujlwm tseem pom tau tias cov ntsiab lus ntawm cov neeg hloov pauv tau ua lub luag haujlwm tseem ceeb hauv lub zog txhua yam ntawm ceramic pobzeb nplaum. Peb tau soj ntsuam qhov kev ua tau zoo ntawm HPMC nrog ntau qib ntawm kev hloov pauv hauv cov nplais pobzeb nplaum, thiab kuaj qhov cuam tshuam ntawm cellulose ether uas muaj cov pab pawg sib txawv nyob rau hauv kev kho mob sib txawv ntawm cov khoom siv ntawm cov pobzeb ceramic nplaum.

Cov kev hloov pauv ntawm lub zog ntawm lub zog nyob rau hauv cov xwm txheej ntawm lub sijhawm qhib yog ua raws li qhov ntsuas kub ib txwm muaj, uas kuj zoo ib yam nrog cov tawv tawv ntawm cellulose ether zaj duab xis peb tau tham txog hauv ntu 2. HPMC nrog cov ntsiab lus siab methoxy (DS) thiab qis hydroxypropoxy ( MS) cov ntsiab lus muaj qhov toughness zoo, tab sis yuav cuam tshuam rau lub wettability ntawm ntub mortar rau cov khoom nto.

4, ntsiab lus

Cellulose ether, tshwj xeeb tshaj yog methyl cellulose ether xws li HEMC thiab HPMC, yog ib qho tseem ceeb additive nyob rau hauv daim ntawv thov ntawm ntau qhuav mortar khoom. Cov cuab yeej tseem ceeb tshaj plaws ntawm cellulose ether yog nws cov dej tuav hauv cov khoom siv hauv tsev. Yog tias tsis ntxiv cellulose ether, cov txheej nyias nyias ntawm cov mortar tshiab yuav qhuav sai sai, yog li cov cement tsis tuaj yeem hydrated li qub, ua rau cov mortar tsis tuaj yeem tawv thiab tsis tuaj yeem tau txais adhesion zoo rau hauv paus. Muaj ntau yam cuam tshuam rau cov dej tuav ntawm cellulose ether, xws li ntau npaum li cas thiab viscosity, thiab nws cov muaj pes tsawg leeg: Kev hloov qib rau qhov kawg ntawm cov tshuaj khib nyiab muaj kev cuam tshuam ntau dua, ntev ntev peb tau sib cav tias viscosity ntawm cellulose ether rau Cov khoom siv cement hauv paus muaj kev cuam tshuam zoo rau lub sijhawm coagulation thiab lwm yam, kev tshawb fawb tsis ntev los no pom tias qhov kev hloov pauv ntawm viscosity ntawm cov cement teeb lub sij hawm cuam tshuam tsawg heev, tab sis yog hloov ntawm hom pab pawg thiab koom tes nrog yog qhov tseem ceeb tshaj plaws. cuam ​​tshuam rau kev ua haujlwm ntawm cellulose ether.

Tam sim no raws li pom kev ua tau zoo thiab lub luag haujlwm ntawm cov nplais nplaum cov ntaub ntawv tseem ceeb:

1, cement

Peb txhua tus paub tias cov cement yeej tsis muaj tshuaj lom ib puag ncig tiv thaiv, thiab muaj zog tiv thaiv kev laus.

2, qib xuab zeb

Qib xuab zeb yog dej xuab zeb tom qab ntxuav tom qab ziab, thiab tom qab ntawd sieving ib qho loj me me ntawm cov xuab zeb, uas tseem tsis muaj tshuaj lom thiab kev tiv thaiv ib puag ncig, nws lub luag haujlwm tseem ceeb yog sau, txhawm rau txo qis qis ntawm cov pobzeb adhesives solidification. .

Saum toj no yog ob yam ntawm txhua tus neeg paub txog cov khoom siv, cov khoom siv polymer ntxiv uas cov pej xeem tsis paub meej hauv qab no, qhov kawg yog dab tsi?

3, HPMC (hydroxypropyl methyl cellulose ether)

HPMC ntxiv rau cov nplais pobzeb nplaum hauv lub luag haujlwm tseem ceeb yog ua kom dej, thickening, lub hom phiaj yog txhawm rau txhim kho cov nplais pobzeb adhesives kawg solidification zog, ncua lub sijhawm qhib thiab txhim kho kev tsim kho, nws qhov chaw yog paj rwb tom qab hloov kho, uas yog hais tias, nws los ntawm xwm, yog tsis muaj kev puas tsuaj rau tib neeg lub cev, kiag li ib puag ncig tiv thaiv khoom;

4, Redispersible polymer hmoov RDP

Nws lub luag haujlwm tseem ceeb hauv cov nplais pobzeb nplaum yog txhawm rau txhim kho kev sib txuas ntawm lub zog, nws yuav tsis muaj kev cuam tshuam rau kev tsim kho, uas yog hais tias, cov npe sib txawv ntawm cov nplais pobzeb adhesives hauv qhov sib ntxiv ntawm Redispersible polymer hmoov RDP peb tsis tuaj yeem txiav txim siab thaum daim ntawv thov. Qhov tsuas yog qhov tuaj yeem cuam tshuam yog lub zog sib txuas ntawm cov nplais pobzeb nplaum tom qab lub cib solidification, Qhov kev ua haujlwm no feem ntau yog los ntawm cov nplais pobzeb kos duab los xyuas seb puas tuaj yeem ua tau raws li lub teb chaws tus qauv, rau Redispersible polymer hmoov RDP tsis yog kua nplaum tsis muaj kua nplaum, Nws yog lub emulsion ntawm ntug ntawm lub tshuab ziab khaub ncaws los ntawm kev siv tshuaj tsuag kom qhuav tom qab ua tiav cov hmoov, tuaj yeem piav qhia nws li emulsion hmoov, rov qab thaum nws ntsib dej yuav yaj dua rau hauv emulsion, uas yog hais tias, cov nplaum. ntawm peb cov nplais pobzeb nplaum yog muab los ntawm emulsion es tsis yog kua nplaum, thiab tom qab ntawd Redispersible polymer hmoov RDP kuj yog cov khoom tiv thaiv ib puag ncig, yog li tsis tas yuav txhawj xeeb txog cov nplais pobzeb nplaum uas muaj cov kua nplaum zoo li no;

5, ntoo fiber

Lub luag haujlwm tseem ceeb ntawm cov nplais pobzeb nplaum yog tiv thaiv kev tawg thiab txo cov tawv nqaij ntawm cov pobzeb ceramic. Nws kuj los ntawm xwm. Nws tawg rau flocc los ntawm kev ua haujlwm ntawm cov ntoo, thiab nws cov ntsiab lus yog ntoo, yog li nws yog ib puag ncig zoo.

6, ether hmoov

Nws lub luag haujlwm tseem ceeb hauv cov nplais pobzeb nplaum yog los tiv thaiv ntws, tiv thaiv plam thiab kev sib koom ua ke HPMC los txhim kho kev tsim kho, nws yog cov khoom ntawm cov nroj tsuag cov hmoov txhuv nplej siab hloov kho los ntawm etherification, tab sis kuj los ntawm cov khoom tiv thaiv ib puag ncig.

Tau pom saum toj no 6 yam khoom siv raw txhua yam tsis muaj teeb meem, ib puag ncig tiv thaiv cov ntaub ntawv, yog li cov nplais pobzeb nplaum tsis yog kua nplaum. Thiab cov khoom siv los ntawm cov khoom, yuav tsum siv cov txheej txheem nyias nyias, txuag lub sijhawm kom txuag tau qhov chaw twb dhau los lawm. Tom qab kev tshawb fawb ntawm cov kws tshaj lij, nrog rau cov ntaub ntawv pov thawj ntawm lub sijhawm, nws tsim nyog los txhawb nqa.