Dab tsi yog redispersible latex hmoov?

Thawj kauj ruam hauv kev tsim cov hmoov polymer redispersible yog los tsim cov polymer dispersion, tseem hu ua emulsion lossis latex. Hauv cov txheej txheem no, dej-emulsified monomers (stabilized los ntawm emulsifiers lossis macromolecular tiv thaiv colloids) hnov ​​​​qab nrog cov neeg pib pib emulsion polymerization. Los ntawm cov tshuaj tiv thaiv no, monomers txuas mus rau cov saw ntev molecules (macromolecules), uas yog polymers. Thaum lub sij hawm no cov tshuaj tiv thaiv, monomer emulsion droplets hloov mus rau polymer "khoom" hais. Nyob rau hauv xws li polymer emulsions, cov stabilizers ntawm qhov chaw particle yuav tsum tiv thaiv cov latex los ntawm txhua txoj kev coalescing thiab yog li destabilizing. Cov sib tov yog tsim los rau cov tshuaj tsuag kom qhuav los ntawm kev ntxiv cov khoom sib txawv, thiab ntxiv cov tshuaj tiv thaiv colloids thiab anti-caking agents tso cai rau cov polymer los tsim cov hmoov dawb-ntws uas tuaj yeem hloov pauv hauv dej tom qab cov tshuaj tsuag qhuav.

Lub redispersible latex hmoov yog muab faib rau hauv cov hmoov sib tov zoo qhuav mortar. Tom qab lub mortar yog tov nrog dej, cov hmoov polymer yog redispersed rau hauv lub freshly tov slurry thiab emulsified dua; vim yog dej ntawm cov cement, deg evaporation thiab / los yog nqus ntawm lub hauv paus txheej, cov pores sab hauv yog dawb Cov dej tsis tu ncua ua rau cov latex particles qhuav los ua cov dej-insoluble nruam zaj duab xis hauv dej. Cov yeeb yaj kiab txuas ntxiv no yog tsim los ntawm kev sib xyaw ntawm ib qho kev sib cais ntawm cov emulsion rau hauv lub cev homogeneous. Txhawm rau ua kom cov hmoov av rov ua dua tshiab los ua cov yeeb yaj kiab hauv cov tshuaj khib nyiab, nws yuav tsum tau ua kom ntseeg tau tias qhov tsawg kawg nkaus ntawm cov yeeb yaj kiab-forming kub yog qis dua qhov kub ntawm qhov kub ntawm cov mortar hloov.

Cov duab me me ntawm cov hmoov polymer redispersible thiab nws cov yeeb yaj kiab-tsim cov khoom tom qab redispersion ua rau nws muaj peev xwm ua rau muaj cov teebmeem hauv qab no ntawm kev ua haujlwm ntawm mortar hauv lub xeev tshiab thiab tawv:

1. Muaj nuj nqi hauv mortar tshiab

◆ Qhov "lubricating nyhuv" ntawm cov khoom ua rau cov tshuaj khib sib tov muaj fluidity zoo, thiaj li tau txais kev tsim kho zoo dua.

◆ Cov nyhuv cua-entraining ua rau cov mortar compressible, ua troweling yooj yim dua.

◆ Ntxiv ntau hom redispersible latex hmoov tuaj yeem tau txais cov mortar hloov nrog cov yas zoo dua los yog ntau dua.

2. Muaj nuj nqi nyob rau hauv hardened mortar

◆ Cov zaj duab xis latex tuaj yeem txuas cov pob txha tawg ntawm lub hauv paus-mortar interface thiab kho cov kab nrib pleb.

◆ Txhim kho qhov sealability ntawm mortar.

◆ Txhim kho lub zog cohesive ntawm mortar: lub xub ntiag ntawm cov khoom siv tau yooj yim thiab elastic heev hauv cov cheeb tsam polymer txhim kho qhov yooj thiab elasticity ntawm mortar,

Muab cohesive thiab dynamic cwj pwm rau cov skeletons nruj. Thaum lub zog yog siv, vim qhov txhim kho elasticity thiab elasticity

Microcracks raug ncua kom txog thaum muaj kev ntxhov siab ntau dua.

◆ Interwoven polymer domains kuj cuam tshuam cov coalescence ntawm microcracks rau hauv cov kab nrib pleb. Yog li ntawd, cov respersible polymer hmoov txhim kho qhov tsis ua hauj lwm kev nyuaj siab thiab tsis ua hauj lwm strain ntawm cov khoom.

Nws yog ib qho tsim nyog yuav tsum tau ntxiv cov hmoov latex redispersible rau cov cement mortar qhuav, vim tias redispersible latex hmoov feem ntau muaj 6 qhov zoo hauv qab no, thiab cov hauv qab no yog cov lus qhia rau koj.

1. Txhim kho kev sib raug zoo thiab kev sib koom ua ke

Redispersible latex hmoov plays lub luag haujlwm zoo hauv kev txhim kho kev sib raug zoo thiab kev sib koom ua ke ntawm cov ntaub ntawv. Vim yog kev nkag mus ntawm cov khoom siv polymer rau hauv qhov pores thiab capillaries ntawm cov cement matrix, zoo cohesion yog tsim tom qab hydration nrog cement. Lub polymer resin nws tus kheej muaj cov khoom zoo heev. Nws yog qhov zoo dua rau kev txhim kho cov adhesion ntawm cement mortar khoom rau substrates, tshwj xeeb tshaj yog cov neeg pluag adhesion ntawm inorganic binders xws li cov cement rau cov organic substrates xws li ntoo, fiber ntau, PVC, thiab EPS.

2. Txhim kho khov-thaw ruaj khov thiab tiv thaiv kev tawg ntawm cov ntaub ntawv zoo

Redispersible latex hmoov, lub plasticity ntawm nws cov thermoplastic resin tuaj yeem kov yeej qhov kev puas tsuaj los ntawm thermal expansion thiab contraction ntawm cement mortar khoom los ntawm qhov kub thiab txias. Kev kov yeej cov yam ntxwv ntawm qhov loj qhuav shrinkage thiab yooj yim tawg ntawm cov cement mortar yooj yim, nws tuaj yeem ua rau cov khoom hloov tau yooj yim, yog li txhim kho cov khoom siv mus ntev.

3. Txhim kho khoov thiab tensile kuj

Nyob rau hauv lub pob txha pob txha tsim tom qab cov cement mortar yog hydrated, lub polymer daim nyias nyias yog elastic thiab tawv, thiab ua raws li ib tug sib koom ua ke ntawm cov cement mortar hais, uas muaj peev xwm tiv taus siab deformation loads thiab txo cov kev ntxhov siab. Nce tensile thiab khoov tsis kam.

4. Txhim kho qhov cuam tshuam

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

5. Txhim kho hydrophobicity thiab txo qhov nqus dej

Ntxiv cocoa redispersible polymer 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 nkag, thiab txhim kho impermeability.

6. Txhim kho hnav tsis kam thiab ua haujlwm ntev

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