Cov xim pleev sab nraud ua lub luag haujlwm tseem ceeb hauv kev tiv thaiv cov tsev los ntawm cov yam ntxwv ib puag ncig xws li nag, hluav taws xob UV, thiab qhov kub thiab txias hloov pauv. Kev ua kom cov xim pleev no siv tau ntev thiab ua haujlwm tau zoo yog qhov tseem ceeb rau kev tswj hwm qhov zoo nkauj thiab kev ua haujlwm ntawm cov tsev. Ib qho ntawm cov khoom siv siab heev uas siv los txhim kho kev ua haujlwm ntawm cov xim pleev sab nraud yog Redispersible Polymer Powder (RDP). RDPs yog siv los txhim kho kev ruaj khov, kev ywj pheej, thiab kev tiv thaiv dej ntawm cov xim pleev, ua rau lawv tsim nyog dua rau cov xwm txheej sab nraum zoov uas nyuaj.
Nkag Siab Txog Cov Hmoov Polymer Redispersible (RDP)
RDPs yog cov polymers uas yaj tau hauv dej uas tuaj yeem rov tawg ua dej tom qab ziab. Cov hmoov no feem ntau yog ua los ntawm vinyl acetate-ethylene (VAE), vinyl acetate-vinyl ester ntawm versatic acid (VeoVa), lossis acrylic copolymers. RDPs yog tsim los ntawm cov txheej txheem hu ua spray drying, qhov twg cov emulsion polymer raug ziab kom ua hmoov zoo. Thaum sib xyaw nrog dej, cov hmoov no rov ua emulsify rau hauv cov latex polymer, uas tuaj yeem siv ua cov binder hauv ntau yam kev siv hauv kev tsim kho, suav nrog cov xim.
Cov txheej txheem ntawm RDP hauv kev txhim kho xim ruaj khov
Kev nplaum zoo dua:
RDP ua kom cov xim pleev sab nraud lo rau zoo dua. Kev lo rau zoo ua kom cov xim lo rau ntawm cov khoom siv, txo qhov muaj feem yuav tev tawm lossis tawg thaum huab cua hnyav. Cov polymers hauv RDP tsim cov zaj duab xis uas yoog tau thiab ruaj khov rau ntawm qhov chaw pleev xim, ua rau muaj kev sib txuas zoo dua.
Kev Ywj Pheej Zoo Dua thiab Kev Tiv Thaiv Kev Tawg:
Qhov yooj ywm ntawm cov zaj duab xis polymer uas tsim los ntawm RDP yog qhov tseem ceeb rau cov xim pleev sab nraud. Cov tsev raug kev kub ntxhov thiab kev nthuav dav, uas tuaj yeem ua rau cov zaj duab xis xim tawg. RDP muab qhov ywj ywm tsim nyog rau cov xim pleev, cia nws nthuav dav thiab cog lus nrog cov khoom siv tsis tawg, yog li ua kom cov xim pleev ntev dua.
Kev Tiv Thaiv Alkali thiab Efflorescence:
Cov nplaim alkaline, xws li cov pob zeb thiab cov plaster, tuaj yeem ua rau cov xim ib txwm puas tsuaj. RDP txhim kho qhov kev tiv thaiv alkali ntawm cov xim, tiv thaiv kev saponification thiab kev puas tsuaj ntawm cov xim zaj duab xis. Tsis tas li ntawd, lawv pab txo cov efflorescence, qhov twg cov ntsev los ntawm cov substrate tsiv mus rau qhov chaw, ua rau cov khoom dawb tsis zoo nkauj.
Kev Txhim Kho Kev Tiv Thaiv Dej Los Ntawm RDP
Cov Khoom Hydrophobic:
RDP muaj peev xwm muab cov khoom hydrophobic rau cov xim sab nraud. Qhov no txhais tau tias cov xim tiv thaiv dej, txo cov dej nqus los ntawm cov khoom siv. Cov xim pleev xim hydrophobic tiv thaiv dej kom tsis txhob nkag mus, uas yog qhov tseem ceeb rau kev tiv thaiv cov khoom hauv qab los ntawm kev puas tsuaj los ntawm cov dej noo xws li kev loj hlob ntawm pwm, kev ua kom tsis muaj zog, thiab cov voj voog khov-thaw.
Kev Tsim Yeeb Yam thiab Kev Sib Koom Tes:
Lub peev xwm tsim cov zaj duab xis ntawm RDP pab txhawb rau kev tiv thaiv dej. Cov zaj duab xis sib txuas ua ke uas tsim los ntawm cov polymer tsim ib qho thaiv uas dej nyuaj rau nkag mus. Cov zaj duab xis no kaw cov qhov me me thiab cov kab nrib pleb hauv cov xim, ua kom nws cov khoom tiv thaiv tiv thaiv nag thiab av noo.
Kev Tiv Thaiv Zoo Dua Rau Kev Kis Dej Pa:
Txawm hais tias RDP ua rau kom tsis txhob muaj dej ntau, lawv kuj tswj tau qhov sib npaug los ntawm kev cia cov pa dej tawm. Cov yam ntxwv no tiv thaiv kev sib sau ua ke ntawm cov dej noo tom qab cov xim pleev xim, uas yuav ua rau muaj kev kub hnyiab lossis tev tawm. Yog li, RDP pab tsim cov txheej txheem ua pa tau tab sis tsis muaj dej.
Cov Kev Siv Tau Zoo thiab Cov Txiaj Ntsig
Kev Txij Nkawm Ntev Dua:
Cov xim uas tau hloov kho nrog RDP muaj lub neej ntev dua piv rau cov xim ib txwm muaj. Qhov no txhais tau tias yuav muaj tsawg dua qhov rov pleev xim dua thiab cov nqi kho qis dua raws sijhawm. Rau cov tswv tsev thiab cov thawj coj, qhov no yog qhov txiaj ntsig zoo rau kev lag luam.
Kev Tiv Thaiv Kev Zoo Nkauj:
Kev siv RDP pab tswj kom cov tsev zoo nkauj. Kev ruaj khov thiab tiv taus tej yam ib puag ncig txhais tau tias cov xim pleev yuav khaws nws cov xim thiab ua tiav ntev dua. Qhov no tseem ceeb heev rau cov tsev lag luam thiab cov tsev keeb kwm uas qhov zoo nkauj yog qhov tseem ceeb.
Kev Ruaj Ntseg thiab Kev Cuam Tshuam rau Ib puag ncig:
Cov RDPs pab txhawb rau kev ruaj khov ntawm cov xim pleev sab nraud. Los ntawm kev ua kom lub neej ntawm cov xim pleev ntev dua, lawv txo qhov zaus ntawm kev pleev xim dua, uas ua rau txo qhov cuam tshuam rau ib puag ncig uas cuam tshuam nrog kev tsim xim, kev siv, thiab kev pov tseg. Tsis tas li ntawd, ntau cov qauv RDP tau tsim los kom zoo rau ib puag ncig, nrog cov qib qis ntawm cov organic compounds (VOCs).
Cov Teeb Meem thiab Kev Xav Txog
Cov Kev Cuam Tshuam ntawm Tus Nqi:
Txawm hais tias RDP muab ntau yam txiaj ntsig, lawv kuj tseem tuaj yeem ua rau tus nqi ntawm cov xim pleev xim nce ntxiv. Cov txiaj ntsig kev lag luam ntawm kev txo qis kev saib xyuas thiab lub neej ntev dua feem ntau them rau cov nqi siab dua thaum pib, tab sis nws yog qhov yuav tsum xav txog rau cov chaw tsim khoom thiab cov neeg siv khoom.
Kev Sib Tw Nrog Lwm Cov Khoom Ntxiv:
Qhov ua tau zoo ntawm RDP tuaj yeem raug cuam tshuam los ntawm qhov muaj lwm yam khoom ntxiv rau hauv cov xim pleev. Kev ua kom sib haum xeeb thiab kev ua tau zoo tshaj plaws yuav tsum tau ua tib zoo tsim thiab sim.
Cov Txheej Txheem Siv:
Kev siv RDP yuav xav tau kev hloov kho rau cov txheej txheem siv. Kev sib tov thiab kev siv kom raug yog qhov tseem ceeb kom ua tiav cov yam ntxwv kev ua tau zoo xav tau.
Cov Hmoov Polymer uas tau tawg ua lub luag haujlwm tseem ceeb hauv kev txhim kho qhov ruaj khov thiab tiv thaiv dej ntawm cov xim sab nraud. Los ntawm kev txhim kho kev nplaum, kev ywj pheej, thiab kev tiv thaiv rau cov yam ntxwv ib puag ncig, RDP pab tsim cov txheej txheem ntev thiab tiv thaiv rau cov tsev. Cov txiaj ntsig ntawm kev siv cov xim hloov kho RDP, xws li kev saib xyuas ntev dua, kev khaws cia zoo nkauj, thiab kev ruaj khov ib puag ncig, ua rau lawv yog qhov kev xaiv zoo rau kev tsim kho niaj hnub. Txawm hais tias muaj kev cov nyom cuam tshuam nrog tus nqi thiab kev tsim qauv, qhov zoo tag nrho uas muab los ntawm RDPs ua rau lawv yog ib qho tseem ceeb hauv kev tsim cov xim sab nraud ua tau zoo. Raws li thev naus laus zis nce qib, qhov ua tau zoo thiab kev siv ntawm RDP yuav nthuav dav, ntxiv dag zog rau lawv qhov tseem ceeb hauv kev lag luam kev tsim kho.
Lub sijhawm tshaj tawm: Tsib Hlis-28-2024