Cov txheej txheem tshiab ntawm redispersible latex hmoov

Cov txheej txheem tom qab

Redividable roj hmab hmoov yog cov hmoov dawb ua tiav los ntawm kev txau thiab ziab tshwj xeeb latex.Nws yog tsuas yog siv los ua ib qho tseem ceeb additive rau "txhiab-sib tov mortar" thiab lwm yam qhuav-mix mortar additives rau sab nrauv phab ntsa rwb thaiv tsev engineering khoom siv..Feem ntau siv refractory latex hmoov yog copolymer ntawm vinyl acetate, uas yog cov hmoov dawb uas tuaj yeem xaub dawb thiab tuaj yeem tawg tau zoo hauv dej los tsim cov emulsion ruaj khov nrog kev ua haujlwm zoo ib yam li cov roj hmab qub.Raws li cov khoom siv ntxiv uas tsis tseem ceeb hauv cov khoom siv tshuaj khib nyiab qhuav, cov hmoov av rov ua dua tshiab ua lub luag haujlwm tseem ceeb hauv cov cement qhuav-siv mortar.Nws tuaj yeem txhim kho kev sib raug zoo thiab kev sib koom ua ke ntawm cov khoom.Txhim kho qhov elastic bending zog thiab flexural zog ntawm cov khoom.Txhim kho qhov khov-thaw tsis kam ntawm cov khoom.Txhim kho huab cua tsis kam, durability, hnav tsis kam ntawm cov khoom.Txhim kho cov hydrophobicity ntawm cov khoom thiab txo cov dej nqus.Txhim kho kev ua haujlwm thiab txo cov khoom shrinkage.Muaj peev xwm tiv thaiv kev tawg.(I) Txhim kho kev sib raug zoo thiab kev sib koom ua ke

Nyob rau hauv qhuav cement mortar khoom, nws yog ib qho tsim nyog yuav tsum tau ntxiv cov roj hmab respersible hmoov.Nws yog qhov pom tseeb heev los txhim kho kev sib raug zoo thiab kev sib koom ua ke ntawm cov khoom.Qhov no yog vim kev nkag mus ntawm cov khoom polymer rau hauv cov pores thiab capillaries ntawm cov cement matrix, thiab qhov tshwm sim ntawm kev sib raug zoo zog tom qab hydration nrog cov cement.Vim qhov adhesion zoo heev ntawm polymer resin nws tus kheej, nws tuaj yeem txhim kho qhov adhesion ntawm cov khoom cement mortar rau substrates, tshwj xeeb tshaj yog kev sib txuas ntawm cov khoom siv tsis zoo xws li cov cement rau cov organic substrates xws li ntoo, fiber ntau, PWC, thiab PS.Kev txhim kho ntawm kev ua haujlwm tsis zoo muaj qhov pom tseeb dua.

Txhim kho khoov thiab tensile kuj

Nyob rau hauv lub pob txha pob txha tsim tom qab cov cement mortar yog hydrated, zaj duab xis ntawm cov polymer yog elastic thiab tawv, thiab ua zoo li ib qho kev sib koom ua ke ntawm cov cement mortar hais, uas tuaj yeem tiv taus siab deformation loads thiab txo cov kev ntxhov siab.Txhim kho tensile thiab khoov tsis kam

Txhim kho qhov cuam tshuam

Redispersible latex hmoov yog cov thermoplastic cob.Cov zaj duab xis mos coated rau ntawm qhov chaw ntawm mortar hais tuaj yeem nqus tau qhov cuam tshuam ntawm sab nraud quab yuam thiab so kom tsis txhob tawg, yog li txhim kho qhov cuam tshuam ntawm mortar.

Txhim kho hydrophobicity thiab txo qhov nqus dej

Ntxiv redispersible latex hmoov tuaj yeem txhim kho microstructure ntawm cement mortar.Nws cov polymer tsim ib qho kev sib txuas tsis tau thaum lub sij hawm cement hydration txheej txheem, kaw cov capillary hauv cov cement gel, thaiv cov dej nqus dej, tiv thaiv kev nkag mus ntawm dej, thiab txhim kho impermeability.

Txhim kho hnav tsis kam thiab durability

Ntxiv redispersible 휘 roj hmab hmoov tuaj yeem ua rau kom lub compactness ntawm cement mortar hais thiab polymer zaj duab xis.Kev txhim kho ntawm cohesive quab yuam sib raug zoo txhim kho lub peev xwm ntawm cov tshuaj khib kom tiv taus kev ntxhov siab, txo tus nqi hnav, txhim kho qhov hnav tsis kam, thiab ua kom lub neej ntev ntawm cov tshuaj khib.

Txhim kho khov-thaw stability thiab zoo tiv thaiv cov khoom tawg

Redispersible latex hmoov, cov nyhuv yas ntawm nws cov thermoplastic resin tuaj yeem kov yeej qhov kev puas tsuaj los ntawm thermal expansion thiab contraction ntawm cov cement mortar khoom los ntawm kev hloov ntawm qhov kub thiab txias.Kev kov yeej qhov tsis txaus ntawm cov cement mortar yooj yim, xws li loj qhuav shrinkage thiab yooj yim tawg, tuaj yeem ua rau cov khoom hloov tau yooj yim, yog li txhim kho cov khoom siv mus ntev.Txawm li cas los xij, muaj qee qhov teeb meem hauv cov txheej txheem tsim khoom ntawm cov hmoov latex redispersible nyob rau hauv daim duab ua ntej, uas ua rau cov latex hais tsis sib xws thiab zoo txaus, thiab agglomeration yog nquag tshwm sim thaum lub sij hawm tsim khoom, tsheb thauj mus los thiab cia.Li no cuam tshuam nws cov nyhuv siv.

Cov txheej txheem no tuaj yeem pom tau los ntawm cov kev daws teeb meem hauv qab no: cov txheej txheem tsim khoom ntawm cov khoom siv rov qab-dispersed latex hmoov, cov ntaub ntawv hauv qab no yog tsim raws li qhov hnyav feem pua ​​​​polymer emulsion 72-85%;tiv thaiv colloid 4-9%;tso tawm tus neeg sawv cev 11 -15%;ua hauj lwm additives 0-5%;tsim los ntawm cov txheej txheem hauv qab no

a, kev npaj ntawm kev tiv thaiv colloid: nyob rau hauv cov tshuaj tiv thaiv kettle, kev tiv thaiv colloid hmoov ntawm batching nqi yog tsis tov nrog dej thiab rhuab mus rau modulated rau hauv cov kua nplaum, thiab ib tug defoamer yog ntxiv, rhuab thiab khaws cia sov kom tsim ib tug pob tshab viscous tiv thaiv colloid. , kom cov viscosity ncav cuag 2500as, khoom Cov ntsiab lus nce mus txog 19.5-20.5%.

b.Kev npaj ntawm dispersion: tso lub npaj tiv thaiv colloid nyob rau hauv lub npaj boiling dej, ces ntxiv cov polymer emulsion ntawm batching nqi, sib tov tusyees, ces ntxiv defoamer thiab ntxiv dej los kho cov viscosity mus rau 70-200Mas, thiab cov ntsiab lus ntawm cov khoom ncav cuag 39% - 42%, sov rau 50-55 °

C, rau kev siv;

C, huab cua tshuab ziab khaub ncaws: qhib huab cua tshuab ziab khaub ncaws, thaum qhov kub ntawm cov khoom noj nkag rau saum toj ntawm cov tshuaj tsuag huab cua ziab kom sov txog li 140-150 ° C, qhov kev npaj dispersion raug xa mus rau cov khoom noj khoom haus ntawm lub tshuab ziab khaub ncaws. sab saum toj ntawm cov tshuaj tsuag kom qhuav ntauwd nrog cov ntsia hlau twj tso kua mis.Nyob rau hauv qhov chaw nres nkoj pub, cov kua dispersion yog atomized rau hauv micro-droplets nrog ib txoj kab uas hla ntawm 10-100 microns los ntawm high-speed centrifugal atomization disc nyob rau hauv qhov chaw nres nkoj pub.Nyob rau tib lub sij hawm, cov micro-droplets yog rhuab sai heev nrog high-temperature airflow, thiab nyob rau tib lub sij hawm, tus neeg sawv cev tso tawm yog ntxiv nyob rau hauv high-temperature airflow.Thaum cov micro-droplets tau rhuab los tsim viscosity, tus neeg sawv cev tso tawm yog adhered rau lub micro-droplets nyob rau hauv lub sij hawm, thiab ces cov dej nyob rau hauv lub micro-droplets yog sai sai evaporated mus dryness los ntawm high-temperature airflow los ua ib tug gas- khoom sib tov;

d, cua txias thiab sib cais: khaws qhov kub ntawm cov cua qhov hluav taws xob ntawm cov tshuaj tsuag kom qhuav ntauwd cua qhov hluav taws xob ntawm 79 ° C-81 ° C, thiab cov roj sib tov yog xa tawm sai sai ntawm lub qhov hluav taws xob cua hauv qab ntawm cov tshuaj tsuag kom qhuav. , thiab ces import rau hauv lub hnab loj lim tom qab txias.Cov hmoov nyob rau hauv airflow yog sib cais thiab cov hmoov sib cais yog cais thiab sieved kom tau cov khoom tiav ntawm redispersed latex hmoov.Ib qho tshwj xeeb embodiments Ntxiv ib qho nyiaj ntawm cov dej huv hauv kev faib ua feem rau lub reactor huv, nce qhov kub txog li 50 ° C, tig rau lub tshuab stirring, ntxiv cov hmoov tiv thaiv colloid raws li 25% ntawm cov dej ntxiv rau lub reactor, thiab cov txheej txheem ntawm kev ntxiv yuav tsum tau qeeb Ntxiv kom tiv thaiv cov hmoov los ntawm agglomerating hauv dej.Tsis txhob ntxiv nws rau sab phab ntsa ntawm lub reactor.Tom qab qhov sib ntxiv ua tiav, ntxiv ib qho defoamer sib npaug rau 1% ntawm tag nrho cov nyiaj.Nws raug nquahu kom siv silicone-based defoamer.Npog lub qhov pub mis thiab kub txog li 95 ° C.Rwb thaiv tsev rau 1 teev, cov kua hauv lub reactor yuav tsum tau tsim rau hauv cov kua nplaum pob tshab, tsis muaj cov khoom dawb, cov qauv, kuaj cov viscosity thiab cov ntsiab lus ntawm cov khoom, yuav tsum tau viscosity mus txog 2500as, thiab cov ntsiab lus khoom kom ncav cuag 19.5 ~ 20.5%.Ntxiv cov tshuaj tiv thaiv colloid npaj rau lub khob sib xyaw, tom qab ntawd ntxiv cov polymer emulsion hauv kev faib ua feem, sib tov cov tshuaj tiv thaiv colloid thiab emulsion tusyees, thiab ntxiv defoamer kom tsim nyog, feem ntau sib npaug li 0.1% ntawm tag nrho cov nyiaj, thiab cov defoamer yuav tsum tau siv los ntawm Koj tus kheej Emulsified silicone tshuaj tua kab mob

Foaming tus neeg sawv cev, thiab ntxiv dej los kho cov viscosity mus rau 70-200pas, thiab cov ntsiab lus ntawm 39% -42%.Nce qhov kub ntawm 5055C.Sampling xeem, npaj siv.

Cov dej hauv cov tee dej yuav qhuav sai sai los ntawm cov cua kub siab, thiab tom qab ntawd cov roj-cov khoom sib tov yuav raug coj tawm sai sai ntawm lub tshuab ziab khaub ncaws, ua kom qhov kub thiab txias ntawm qhov hluav taws xob cua ntawm qhov hluav taws xob qis ntawm cov khoom siv ziab ntawm 79 ° C -81 ° Co. Cov roj sib tov yog coj los ntawm cov khoom siv ziab Tom qab tawm mus, ntxiv dehumidified 5 ° C cua qhuav kom txias, thiab cov huab cua uas muaj hmoov yog nkag mus rau hauv lub hnab loj lim, thiab cov hmoov hauv lub airflow yog sib cais los ntawm ob txoj kev ntawm cyclone sib cais thiab pom kev sib cais., Cov hmoov sib cais yog cais thiab sieved kom tau redispersible latex hmoov Islands tuaj.

Thauj 1,000 kg ntawm cov kua dispersion nrog cov ntsiab lus ntawm 42% mus rau lub tshuab ziab khaub ncaws ntawm ib lub siab, thiab ntxiv 51 kg ntawm tus neeg tso tawm raws li cov txheej txheem saum toj no tib lub sijhawm, qhuav los ntawm kev txau thiab cais cov khoom thiab cov roj, thiab tau txais hmoov zis ntawm 461 kg nrog haum fineness.