Lwm yuav ua kom cov dej ua ntsuas muaj kev nplua nplaub thiab tsis muaj kev pov tseg los ntawm VAE emulsion

Qhov kev xav txog VAE Emulsion thiab kev tshuaj ntxiv rau kev tswj hwm

Qhov kev tshuaj ntxiv thiab kev tswj hwm ntawm cov ntaub ntawv hauv cement matrices

Kev ntev ntawm tensile zoo dua rau cov acrylic emulsions tshwj xeeb (cov lus qhia ntawm ASTM D412)

Thiab puav tib neeg raws li kev kawm ntawv ASTM D412, VAE emulsions muaj qhov ntau dua 40 rau 60 feeb pua (percent) ntawm qhov ntau dua ntawm tensile elongation vim compared rau cov acrylic emulsions tshwj xeeb. Nrog rau qhov ntau dua ntawm glass transition temperature uas yog ib qho ntau dua tsawg rau -5 Celsius rau 0 Celsius, cov khoom no tuaj yeem rov qab los ua kom zoo dua tom qab tau siv los ntawm kev tso cia lossis kev tso cia. Cov acrylic tshwj xeeb yuav tshwm sim kev tawg thaum muaj kev tso cia ntau dua 5 feeb pua (percent). Qhov yuam kev tshwj xeeb tuaj yeem los ntawm qhov ntau dua ntawm kev ntxiv ntau. Cov lus tshuaj uas siv VAE tuaj yeem rov qab los ua kom zoo dua rau cov tawg ntau ntau uas muaj qhov loj dua 0.5 millimeter tsis tawg. Qhov no yog qhov yuam kev tshwj xeeb rau cov ntsiag uas muaj kev hloov pauv lossis kev hloov pauv thaum muaj lub sijhawm, txoj kev uas muaj cov precast concrete structures lossis cov expansion joints uas peb pom hauv cov rooj thiab cov tsev.

VAE Emulsion's Qhov Tswj Hwm Rau Cov Tawg Hauv Cov Lus Tshuaj Uas Muaj Cement

Qhov Kev Koo Koo ntawm Elastic Film thiab Microcrack Bridging Los Via Recovery Behavior

Thaum nws txhawb, VAE emulsion ua tau cov polymer film uas muaj kev tswj hwm thiab nws yuav rau hauv cement matrix. Qhov uas dhau los yog qhov zoo li no—cov network no yuav rau lub cim ntawm cov khawv ntau npaum no uas muaj los ntawm qhov tshuav, qhov rov qab thiab qhov rov qab ntawm substrate. Cov khoom no muaj qhov uas hu ua low glass transition temperature, uas yog qhov uas nws rov qab mus rau qhov yooj yim thaum nws tawg. Qhov lus no pab nws tshem tawm kev tswj hwm thiab tshem tawm kev khawv tsis rov qab. Thaum peb sib piv rau lwm cov khoom uas muaj kev tswj hwm ntau npaum no, xwb acrylics lossis styrene-butadiene systems, VAE modified coatings muaj kev tswj hwm zoo dua thaum muaj kev tswj hwm ntau npaum no. Nws ua haujlwm zoo thaum muaj kev rov qab ntawm -15 degrees Celsius rau 50 degrees Celsius, thiab nws kuj tswj hwm qhov humidity ntawm 30% rau 90% tsis tshem tawm. Vim tias cov lus no, cov neeg siv cov khoom tseem ceeb tuaj yeem xa VAE products rau cov qhov chaw tseem ceeb uas muaj kev tswj hwm ntau npaum no, xwb bridge decks thiab waterproofing membranes rau cov foundation ntawm tsev.

Kev Tshuaj Ntawv Txhawb Kev Tsim Kev Tshuaj Ntawv: Dab tsi ntawv uas muaj Polymer-Modified Mortar (EN 1504-2)

Thiab rau lub cim EN 1504-2, thaum cov ntawv uas muaj VAE emulsion 8% los ntawm qhov loj ntawm cov ntawv, lawv tau txais kev tshuaj ntawv tshuaj ntau dua li cov ntawv tshwj xeeb thaum lawv tau ua kev tshuaj ntxiv rau kev tshuaj ntxiv. Cov kev tshuaj ntxiv no puav leej cov kev tshuaj ntxiv uas muaj kev tshuaj ntxiv ntawm 5 thiab 20 MPa, kev hloov hluav taws xob hauv qhov sib txawv, thiab kev tshuaj ntxiv ntawm kev tshuaj ntxiv thiab kev tshuaj ntxiv. Cov ntawv uas muaj kev tshuaj ntxiv tau txais kev tshuaj ntxiv tsis txog 0.1 mm, thaum cov ntawv tshwj xeeb tau txais kev tshuaj ntxiv ntau dua 0.5 mm. Yog li cas VAE tuaj yeem ua haujlwm zoo heev? Nws tso kev tshuaj ntxiv rau hauv cov ntawv polymer, tsis yog tso kev tshuaj ntxiv rau hauv cov chaw uas yuav tsum tau txais kev tshuaj ntxiv. Cov lus nug los ntawm cov phooj ywg nyob rau hauv Europe kuj pab tso cai rau no. Cov kev ua haujlwm uas siv VAE tau txais kev tshuaj ntxiv 60% ntau dua rau 5 xyoo, uas pab sau cov neeg siv thiab cov neeg ua haujlwm nyob rau hauv kev tshuaj ntxiv thiab kev tshuaj ntxiv.

Tsim Kev Tswj Hwm Qhov Paub: Tshem Tshaj Qhov Ntau ntawm VAE Emulsion

Koj Yuav Tsum Los Ntsib Qhov Kev Tswj Hwm–Qhov Ntau–Qhov Tswj Hwm

Kuam ntxawv ntawm VAE emulsion uas txaus yog txhua yam hauv kev nrhiav qhov chaw zoo tshaj plaws uas muaj kev tswj hwm, kev nyuaj rau thaum muaj kev puas, thiab kev sib koom ua ke ntawm cov ntaub ntawv sib txawv. Thaum peb ntxiv cov ntaub ntawv polymer ntau dua, piv txwv li 25% ntawm qhov loj ntawm cov ntaub ntawv, nws pab tshem tawm cov kab laug vim tias cov ntaub ntawv yuav muaj kev tswj hwm ntau dua thiab pab txhim kho cov kab laug zoo dua. Tiamsis yog peb ntxiv ntau dua, qhov nyuaj rau thaum muaj kev puas yuav tawg los 30%, thiab kev sib koom ua ke ntawm cov ntaub ntawv yuav tawg, tshwj xeeb tias rau cov ntaub ntawv uas muaj qhov loj tsawg. Ntawd li, yog peb ntxiv tsawg dua 15%, cov ntaub ntawv tsuas yog tsis tuaj yeem tawg tau thiab yuav tawg los ntawm kev cuam tshuam ntawm cov dej thiab kev cuam tshuam ntawm kev tawg. Lub tsev tshwj xeeb thiaj xav tias qhov tshwj xeeb ntawm 15% thiab 25% yog qhov zoo tshaj plaws, tab sis qhov zoo tshaj plaws yuav nyob ntawm qhov peb xav ua li cas. Qhov ua lub tsev yuav tsum muaj kev nyuaj rau thiab tsis tuaj yeem tawg los ntawm kev sib tsoo, thaum li qhov ua cov ntaub ntawv tshem tawm thiab cov ntaub ntawv rau hauv lub tsev yuav tsum muaj kev tswj hwm thiab tsis tawg los ntawm kev tawg thiab sib koom ua ke zoo. KeV ua cov ntaub ntawv kom paub tias cov ntaub ntawv yuav tawg los ntawm kev sib tsoo ntawm cov dej yuav pab peb paub tias peb tau txais qhov tshwj xeeb uas cov ntaub ntawv ua haujlwm zoo.

Kev ua haujlwm ntawm VAE Emulsion nyob rau hauv cov kev siv hauv qhov chaw nyob ntawm lub ntiaj teb

Kev tiv taub ntawm kev hloov ntsiab thiab ntsiab (−20°C rau +60°C) nyob rau hauv cov sealant rau lub ntsej muag

Thaum peb xav txog kev kho cov ntsiab ntawm lub tsev, VAE emulsion yog qhov zoo heev rau kev kho cov ntsiab ntawm lub tsev vim nws muaj zog zoo heev rau kev tswj cov cim kub thiab yuam (temperature) uas yuav tshwm sim hauv qhov chaw nyob, uas yuav kub heev li 60 Celsius degrees thiab yuav yuam heev li -20 Celsius degrees. Cov ntsiab uas VAE emulsion tsim tau yog muaj zog tshuaj ntev thiab muaj zog tshuaj ntev heev li 90% ntawm qhov zog tshuaj ntev ntawm nws thaum nws tau tshwm sim hauv qhov chaw nyob rau 5 xyoo. Qhov no yog 40% zoo dua rau kev tswj kom tsis muaj kab laug (cracks) los ntawm cov khoom kho tsev (sealants) uas peb tuaj yeem pom hauv tsev khoom (market) tam sim no. Qhov uas VAE yog zoo heev li no yog vim nws muaj zog tshuaj ntev zoo heev thaum nws tau tshwm sim hauv qhov chaw nyob thiab nws tau tshwm sim hauv qhov chaw nyob rau ntau xyoo. Qhov no txhais tau tias lub tsev yuav tsis muaj dej nyha (watertight) thiab tsis muaj kev kho tsev (peeling) los ntawm cov ntsiab ntawm lub tsev, tib yam li thaum lub tsev tau tshwm sim hauv qhov kub thiab yuam (temperature changes) rau hauv hnub thiab yuav kub thiab yuam heev li 50 degrees. Peb tau pom qhov zoo no hauv ntau qhov chaw, raws li Germany, Britain, thiab ntau qhov chaw hauv Canada, uas cov neeg sau tsev (architects) tau xaiv VAE modified systems. Lub tsev hauv lawv yuav nyuaj dua rau kev kho tsev (maintenance cycles) thiab yuav tsum kho tsev (recoating) li ½ ntawm qhov tsev uas siv cov khoom acrylic tam sim no.

FAQ Qeb

Koj pom ntau li VAE emulsion?

VAE emulsion, lossis vinyl acetate-ethylene emulsion, yog qhov polymer uas siv los txuas ntxiv cov kev nyab xeeb thiab kev nyab xeeb ntawm cement matrices thiab cov coating.

VAE yuav sib piv li cas rau cov acrylic emulsions tshwj xeeb?

Cov VAE emulsions muaj kev nyab xeeb zoo dua li cov acrylic emulsions tshwj xeeb, muaj kev nyab xeeb zoo dua thiab kev txuas qhov tsis zoo zoo dua.

Puas yog VAE raug xaiv rau cov qhov chaw sib tw zoo tshaj plaws?

Cov kws kho mob nyiam siv cov VAE rau cov qhov chaw sib tw vim tias lawv muaj kev nyab xeeb, tuaj yeem txhawb cov hluav tais tshwj xeeb, thiab muaj kev tswj hwm ntau dua thaum lub sijhawm.