Daim ntawv thov ntawmRedispersible latex hmoov (RDP) nyob rau hauv putty hmoov formulations tau garnered xim nyob rau hauv kev tsim kho thiab tsev cov ntaub ntawv kev lag luam vim nws muaj feem xyuam rau cov khoom ntawm cov khoom kawg. Redispersible latex hmoov yog qhov tseem ceeb ntawm cov hmoov polymer uas muaj peev xwm tsim kev sib cais thaum tov nrog dej. Cov dispersions no qhia ntau yam txiaj ntsig zoo rau lub putty, nrog rau kev txhim kho adhesion, yoog raws, dej tsis kam, thiab, qhov tseem ceeb, txheej txheem hardening.
Nkag siab Putty Powder thiab Redispersible Latex Powder
Putty hmoov yog cov hmoov zoo siv cov khoom siv feem ntau rau txhaws qhov khoob, smoothing nto, thiab npaj substrates rau tha xim lossis lwm yam tiav. Lub hauv paus muaj pes tsawg leeg ntawm putty hmoov feem ntau muaj xws li binders (xws li, cement, gypsum), fillers (xws li, talc, calcium carbonate), thiab additives (xws li, retarders, accelerators) uas tswj nws cov hauj lwm zog. Thaum sib tov nrog dej, cov hmoov putty ua ib qho muab tshuaj txhuam uas hardens dhau sijhawm, tsim kom muaj qhov ruaj khov, du nto.
Redispersible latex hmoov (RDP) yog cov dej-soluble polymer hmoov ua los ntawm cov tshuaj tsuag kom qhuav aqueous dispersions ntawm polymer emulsions. Cov polymers uas siv hauv RDP suav nrog styrene-butadiene (SBR), acrylics, thiab vinyl acetate-ethylene (VAE). Qhov sib ntxiv ntawm RDP rau putty hmoov txhim kho lub cev thiab cov khoom siv kho mob ntawm cov tshuaj kho kom zoo, feem ntau los ntawm kev txhim kho cov ntawv cog lus muaj zog, yoog raws, thiab tiv thaiv kev tawg.
Hardening ntawm Putty hmoov
Lub hardening ntawm putty hmoov tshwm sim raws li cov binder Cheebtsam (xws li cov cement los yog gypsum) tau txais cov tshuaj tiv thaiv nrog dej. Cov txheej txheem feem ntau hu ua hydration (rau cement-based putties) los yog crystallization (rau gypsum-raws li putties), thiab nws tshwm sim nyob rau hauv lub tsim ntawm cov khoom theem uas harden lub sij hawm. Txawm li cas los xij, cov txheej txheem no tuaj yeem cuam tshuam los ntawm ntau yam, xws li muaj cov khoom ntxiv, av noo, qhov kub thiab txias, thiab muaj pes tsawg leeg ntawm putty nws tus kheej.
Lub luag haujlwm ntawm RDP hauv cov txheej txheem hardening no yog txhawm rau txhim kho kev sib txuas ntawm cov khoom, txhim kho kev yooj yim, thiab tswj cov evaporation ntawm dej. RDP ua haujlwm raws li kev sib khi uas, ib zaug hloov pauv hauv dej, tsim ib lub network polymeric hauv lub putty. Lub network no pab ntxiab cov dej molecules ntev dua, txo qis tus nqi ntawm evaporation thiab yog li ncua sij hawm ua hauj lwm ntawm putty. Tsis tas li ntawd, lub network polymer pab tsim kom muaj zog, sib zog ua kom muaj zog ntau dua los ntawm kev txhim kho qhov sib cuam tshuam.
Kev cuam tshuam ntawm Redispersible Latex Powder ntawm Cov Txheej Txheem Hardening
Txhim kho kev ua haujlwm thiab sijhawm qhib:
Kev suav nrog RDP hauv putty formulations txhim khu kev ua hauj lwm los ntawm kev ua kom cov txheej txheem kom qhuav, muab sij hawm ntau rau daim ntawv thov. Qhov no yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig hauv cov haujlwm loj uas cov putty yuav tsum tau nthuav tawm ntau thaj chaw ua ntej nws teeb tsa.
Nce Flexibility:
Ib qho txiaj ntsig tseem ceeb ntawm kev ntxiv RDP yog kev txhim kho hauv kev hloov pauv. Thaum cov tshuaj pleev ib ce zoo li nkig thaum tawv, RDP pab txhawb rau cov khoom siv kho tau yooj yim dua, txo qhov kev pheej hmoo ntawm kev tawg thaum muaj kev ntxhov siab lossis kub hloov pauv.
Lub zog thiab Durability:
RDP-hloov putties pom muaj zog dua compressive thiab tsis kam hnav thiab tsim kua muag piv rau cov formulations tsis hloov. Qhov no yog vim qhov tsim ntawm cov polymer matrix uas txhawb nqa cov qauv kev ncaj ncees ntawm cov tawv tawv putty.
Txo Shrinkage:
Lub network polymeric tsim los ntawm redispersible latex hmoov kuj pab txo qis shrinkage thaum lub sij hawm kho. Qhov no yog qhov tseem ceeb tshwj xeeb hauv kev tiv thaiv kev tsim cov kab nrib pleb, uas tuaj yeem cuam tshuam qhov kev ua tau zoo thiab kev zoo nkauj ntawm putty.
Dej tsis kam:
Putty hmoov sib xyaw nrog redispersible latex hmoov zoo li dej-resistant ntau dua. Cov latex particles tsim ib txheej hydrophobic nyob rau hauv lub putty, ua rau cov khoom kho tsis tshua muaj kev cuam tshuam rau cov dej nqus dej thiab, yog li ntawd, zoo dua rau kev siv sab nrauv.
Incorporating redispersible latex hmoov rau hauv putty formulations ho txhim kho nws cov khoom, tshwj xeeb tshaj yog thaum lub sij hawm hardening txheej txheem. Cov txiaj ntsig tseem ceeb ntawm RDP suav nrog kev txhim kho kev ua haujlwm, txhim kho kev hloov pauv, nce lub zog thiab kav ntev, txo qis, thiab dej tsis kam zoo dua. Cov kev txhim kho no ua rau RDP-hloov putties tsim nyog rau ob qho tib si sab hauv thiab sab nrauv daim ntaub ntawv, muab kev ua haujlwm ntev dua thiab kev ua haujlwm nyob rau hauv ib puag ncig sib txawv.
Rau kev tsim kho cov kws tshaj lij thiab cov chaw tsim khoom, siv covredispersible latex hmoov muaj ib txoj hauv kev yooj yim tab sis siv tau los txhim kho cov khoom ntawm cov tshuaj pleev ib ce, ua rau cov khoom siv yooj yim dua, siv tau yooj yim dua, thiab tsis tshua muaj kev tawg los yog shrinkage thaum lub sij hawm. Los ntawm kev ua kom zoo rau kev tsim nrog RDP, cov hmoov putty ua tau ntau yam, nrog rau kev ua tau zoo tag nrho ntawm cov adhesion, hardness, thiab tsis kam rau cov khoom.
Post lub sij hawm: Mar-20-2025