Cov txheej txheem tshiab ntawm cov hmoov latex uas tawg tau dua tshiab

Cov txheej txheem keeb kwm yav dhau los

Cov hmoov roj hmab uas faib tau dua tshiab yog cov hmoov dawb khov uas ua los ntawm kev txau thiab ziab cov roj hmab tshwj xeeb. Nws feem ntau yog siv ua cov khoom ntxiv tseem ceeb rau "txhiab-mix mortar" thiab lwm yam khoom siv sib xyaw qhuav rau cov khoom siv rwb thaiv tsev phab ntsa sab nraud. . Cov hmoov roj hmab refractory feem ntau yog cov copolymer ntawm vinyl acetate, uas yog cov hmoov dawb uas tuaj yeem txav tau yooj yim thiab tuaj yeem tawg zoo hauv dej los tsim cov emulsion ruaj khov nrog kev ua tau zoo ib yam li cov roj hmab qub. Raws li cov khoom siv ntxiv tseem ceeb hauv cov khoom sib xyaw qhuav, cov hmoov roj hmab redispersible ua lub luag haujlwm tseem ceeb hauv cov cement qhuav-mixed mortar. Nws tuaj yeem txhim kho lub zog sib txuas thiab kev sib koom ua ke ntawm cov khoom. Txhim kho lub zog khoov thiab lub zog flexural ntawm cov khoom. Txhim kho qhov tsis kam khov-thaw ntawm cov khoom. Txhim kho kev tiv thaiv huab cua, kev ruaj khov, kev tiv thaiv hnav ntawm cov khoom. Txhim kho qhov hydrophobicity ntawm cov khoom thiab txo qhov nqus dej. Txhim kho kev ua haujlwm thiab txo cov khoom shrinkage. Tuaj yeem tiv thaiv kev tawg. (I) Txhim kho lub zog sib txuas thiab kev sib koom ua ke

Hauv cov khoom siv cement mortar qhuav, nws yog qhov tsim nyog heev uas yuav tsum ntxiv cov hmoov roj hmab uas tawg tau dua tshiab. Nws yog qhov pom tseeb heev los txhim kho lub zog sib txuas thiab kev sib koom ua ke ntawm cov khoom siv. Qhov no yog vim muaj kev nkag mus ntawm cov khoom polymer rau hauv cov qhov hws thiab cov hlab ntsha ntawm cov cement matrix, thiab qhov tshwm sim ntawm lub zog sib koom ua ke zoo tom qab hydrating nrog cov cement. Vim yog qhov kev sib txuas zoo heev ntawm polymer resin nws tus kheej, nws tuaj yeem txhim kho qhov kev sib txuas ntawm cov khoom siv cement mortar rau cov substrates, tshwj xeeb tshaj yog kev sib txuas ntawm cov inorganic binders xws li cement rau cov organic substrates xws li ntoo, fiber, PWC, thiab PS. Kev txhim kho ntawm kev ua haujlwm tsis zoo muaj qhov cuam tshuam ntau dua.

Txhim kho qhov khoov thiab tensile tsis kam

Hauv cov pob txha tawv uas tsim tom qab cov cement mortar tau hydrated, zaj duab xis ntawm cov polymer yog elastic thiab tawv, thiab ua zoo li qhov sib koom ua ke ntawm cov cement mortar me me, uas tuaj yeem tiv taus cov khoom thauj deformation siab thiab txo qhov kev ntxhov siab. Txhim kho tensile thiab bending tsis kam

Txhim kho qhov cuam tshuam tsis kam

Cov hmoov latex uas tawg tau dua yog cov thermoplastic resin. Cov zaj duab xis mos mos uas txheej rau ntawm qhov chaw ntawm cov khoom mortar tuaj yeem nqus tau qhov cuam tshuam ntawm lub zog sab nraud thiab so tsis tawg, yog li txhim kho qhov kev tiv thaiv kev cuam tshuam ntawm mortar.

Txhim kho hydrophobicity thiab txo qhov nqus dej

Ntxiv cov hmoov latex uas yaj tau dua tuaj yeem txhim kho qhov microstructure ntawm cov cement mortar. Nws cov polymer tsim ib lub network uas tsis rov qab tau thaum lub sijhawm ua kom cov cement hydration, kaw cov capillary hauv cov cement gel, thaiv kev nqus dej, tiv thaiv kev nkag mus ntawm dej, thiab txhim kho kev tsis nkag mus.

Txhim kho kev hnav tsis kam thiab kev ua haujlwm ntev

Ntxiv cov hmoov roj hmab uas tawg tau dua tuaj yeem ua rau kom cov cement mortar me me thiab cov zaj duab xis polymer sib zog ua ke. Qhov kev txhim kho ntawm lub zog sib koom ua ke ua rau lub peev xwm ntawm cov mortar tiv taus kev ntxhov siab shear, txo qhov hnav, txhim kho kev tiv thaiv kev hnav, thiab ua kom lub neej ua haujlwm ntawm cov mortar ntev dua.

Txhim kho qhov ruaj khov thiab yaj kom zoo thiab tiv thaiv cov khoom tawg

Cov hmoov latex uas tawg tau dua, cov nyhuv yas ntawm nws cov thermoplastic resin tuaj yeem kov yeej qhov kev puas tsuaj los ntawm kev nthuav dav thermal thiab kev cog lus ntawm cov khoom siv cement mortar los ntawm kev hloov pauv ntawm qhov kub thiab txias. Kev kov yeej qhov tsis zoo ntawm cov cement mortar yooj yim, xws li kev ntsws qhuav loj thiab yooj yim tawg, tuaj yeem ua rau cov khoom siv yooj yim dua, yog li txhim kho kev ruaj khov mus sij hawm ntev ntawm cov khoom siv. Txawm li cas los xij, muaj qee qhov teeb meem hauv cov txheej txheem tsim cov hmoov latex uas tawg tau dua hauv cov khoom qub, ua rau cov khoom latex tsis sib xws thiab zoo txaus, thiab kev sib sau ua ke feem ntau tshwm sim thaum lub sijhawm tsim khoom, kev thauj mus los thiab kev khaws cia. Yog li cuam tshuam rau nws cov txiaj ntsig siv.

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

a, kev npaj cov colloid tiv thaiv: hauv lub lauj kaub tshuaj tiv thaiv, cov hmoov colloid tiv thaiv ntawm cov khoom sib xyaw tsis sib xyaw nrog dej thiab cua sov kom hloov kho rau hauv cov kua nplaum, thiab ntxiv cov tshuaj defoamer, cua sov thiab khaws cia kom sov los ua cov tshuaj tiv thaiv viscous pob tshab, yog li ntawd cov viscosity ncav cuag 2500as, cov ntsiab lus khoom ncav cuag 19.5-20.5%.

b. Kev npaj ntawm kev sib xyaw: muab cov colloid tiv thaiv uas tau npaj tseg rau hauv lub lauj kaub npaj, tom qab ntawd ntxiv cov polymer emulsion ntawm cov khoom sib xyaw, sib tov kom sib npaug, tom qab ntawd ntxiv cov defoamer thiab ntxiv dej kom kho qhov viscosity rau 70-200Mas, thiab cov ntsiab lus khov kho ncav cuag 39% - 42%, sov rau 50-55 °

C, rau kev siv;

C, huab tsuag kom qhuav: qhib lub pej thuam huab tsuag kom qhuav, thaum qhov kub ntawm qhov nkag pub rau sab saum toj ntawm lub pej thuam huab tsuag kom qhuav tau cua sov txog li 140-150 DEG C, cov khoom sib xyaw uas tau npaj tseg raug xa mus rau qhov nkag pub rau sab saum toj ntawm lub pej thuam tsuag kom qhuav nrog lub twj tso kua mis ntsia hlau. Hauv qhov chaw pub, cov kua sib xyaw raug atomized rau hauv cov dej me me nrog lub cheeb ntawm 10-100 microns los ntawm lub disc centrifugal atomization ceev ceev hauv qhov chaw pub. Tib lub sijhawm, cov dej me me raug cua sov sai nrog cua kub siab, thiab tib lub sijhawm, tus neeg sawv cev tso tawm raug ntxiv rau hauv cua kub siab. , thaum cov dej me me raug cua sov kom tsim cov viscosity, tus neeg sawv cev tso tawm raug lo rau cov dej me me raws sijhawm, thiab tom qab ntawd cov dej hauv cov dej me me raug evaporated sai sai kom qhuav los ntawm cua kub siab los ua cov roj-khoom sib xyaw;

d, txias thiab sib cais: khaws qhov kub ntawm qhov cua tawm ntawm lub tshuab ziab kom qhuav ntawm 79 ° C-81 ° C, thiab cov roj-khoom sib xyaw tau xa tawm sai sai los ntawm qhov cua tawm ntawm qab ntawm lub tshuab ziab kom qhuav, thiab tom qab ntawd xa mus rau hauv lub hnab lim loj tom qab txias. Cov hmoov hauv cov cua tau sib cais thiab cov hmoov sib cais tau faib ua pawg thiab sieved kom tau txais cov khoom tiav ntawm cov hmoov latex rov qab. Cov Qauv Tshwj Xeeb Ntxiv ib qho dej huv raws li qhov sib piv rau lub tshuab ua kom huv, tsa qhov kub kom txog li 50 ° C, tig rau lub tshuab sib xyaw, ntxiv cov hmoov colloid tiv thaiv raws li 25% ntawm cov dej ntxiv rau lub tshuab ua kom qhuav, thiab cov txheej txheem ntawm kev ntxiv yuav tsum qeeb Ntxiv nws kom tiv thaiv cov hmoov los ntawm kev sib sau ua ke hauv dej. Tsis txhob ntxiv rau phab ntsa sab ntawm lub tshuab ua kom qhuav. Tom qab ntxiv tiav, ntxiv cov tshuaj defoamer sib npaug rau 1% ntawm tag nrho cov nyiaj. Nws raug pom zoo kom siv cov tshuaj defoamer raws li silicone. Npog lub qhov pub mis thiab cua sov txog li 95 ° C. Nyob rau hauv ib teev, cov kua hauv lub reactor yuav tsum tau ua rau hauv cov kua nplaum pob tshab, tsis muaj cov khoom dawb, kuaj, kuaj viscosity thiab cov khoom khov, xav tau viscosity kom txog li 2500as, thiab cov khoom khov kom txog li 19.5 ～ 20.5%. Ntxiv cov colloid tiv thaiv uas tau npaj tseg rau hauv lub lauj kaub sib xyaw, tom qab ntawd ntxiv cov polymer emulsion hauv qhov sib piv, sib tov cov colloid tiv thaiv thiab cov emulsion sib npaug, thiab ntxiv cov defoamer kom raug, 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

Tus neeg sawv cev ua npuas dej, thiab ntxiv dej kom kho qhov viscosity rau 70-200pas, thiab cov khoom khov rau 39% -42%. Nce qhov kub mus rau 5055C. Kev kuaj qauv, npaj siv.

Cov dej hauv cov tee dej yuav qhuav sai sai los ntawm cov cua kub siab, thiab tom qab ntawd cov roj-khoom sib xyaw yuav raug coj tawm ntawm lub pej thuam ziab sai sai, khaws qhov kub ntawm qhov cua tawm ntawm qhov cua qis dua ntawm cov khoom siv ziab ntawm 79 ° C -81 ° Co. Cov roj-khoom sib xyaw raug coj los ntawm cov khoom siv ziab Tom qab tawm mus, ntxiv cov cua qhuav dehumidified 5 ° C kom txias, thiab cov cua uas muaj hmoov tau nkag mus rau hauv lub hnab lim loj, thiab cov hmoov hauv cov cua tau sib cais los ntawm ob txoj kev sib cais cyclone thiab kev sib cais lim. , Cov hmoov sib cais tau faib thiab sieved kom tau txais cov kob hmoov latex redispersible.

Thauj 1,000 kg ntawm cov kua dispersion nrog cov khoom khov kho ntawm 42% mus rau lub pej thuam ziab ntawm qee qhov siab, thiab ntxiv 51 kg ntawm cov neeg sawv cev tso tawm raws li txoj kev saum toj no tib lub sijhawm, ziab los ntawm kev txau thiab cais cov khoom khov kho thiab roj, thiab tau txais cov hmoov tso tawm ntawm 461 kg nrog qhov zoo tsim nyog.