Mchere woteteza kutentha wa EPS ndi chinthu chopepuka choteteza kutentha chomwe chimasakanizidwa ndi zomangira zopanda organic, zomangira zachilengedwe, zosakaniza, zowonjezera ndi zomangira zopepuka mu gawo linalake. Pakati pa zomangira zoteteza kutentha za EPS zomwe zikufufuzidwa ndikugwiritsidwa ntchito pano, zitha kubwezeretsedwanso. Ufa wa latex wobalalitsidwa umakhudza kwambiri magwiridwe antchito a matope ndipo umatenga gawo lalikulu pamtengo, kotero wakhala chidwi cha anthu. Kugwira ntchito kwa mgwirizano wa matope oteteza tinthu tating'onoting'ono akunja a khoma makamaka kumachokera ku chomangira cha polymer, ndipo kapangidwe kake kamakhala makamaka vinyl acetate/ethylene copolymer. Ufa wa latex wobwezeretsedwanso ungapezeke powumitsa mtundu uwu wa polymer emulsion. Chifukwa cha kukonzekera molondola, kunyamula mosavuta komanso kusungira mosavuta ufa wa latex wobwezeretsedwanso womwe ukugwiritsidwa ntchito popanga, ufa wapadera wa latex womasuka wakhala njira yopitira patsogolo chifukwa cha kukonzekera kwake molondola, kunyamula mosavuta komanso kusungira kosavuta. Kugwira ntchito kwa matope oteteza tinthu tating'onoting'ono a EPS kumadalira kwambiri mtundu ndi kuchuluka kwa polima yomwe imagwiritsidwa ntchito. Ufa wa latexr wa Ethylene-vinyl acetate (EVA) wokhala ndi ethylene yambiri komanso Tg yochepa (kutentha kwagalasi) umagwira ntchito bwino kwambiri pankhani ya mphamvu ya impact, mphamvu ya bond komanso kukana madzi.
Kukonza bwino ufa wa latex pakugwira ntchito kwa matope kumachitika chifukwa chakuti ufa wa latex ndi polima yokhala ndi mamolekyu ambiri okhala ndi magulu a polar. Ufa wa latex ukasakanizidwa ndi tinthu ta EPS, gawo losakhala la polar mu unyolo waukulu wa polima ya latex ufa lidzayamba kusakanikirana ndi pamwamba pa EPS. Magulu a polar mu polima amalunjika kunja pamwamba pa tinthu ta EPS, kotero kuti tinthu ta EPS timasintha kuchoka pa hydrophobicity kupita ku hydrophilicity. Chifukwa cha kusintha kwa pamwamba pa tinthu ta EPS ndi ufa wa latex, kumathetsa vuto lakuti tinthu ta EPS timakumana mosavuta ndi madzi. Kuyandama, vuto la kuyika kwakukulu kwa matope. Panthawiyi, simenti ikawonjezedwa ndikusakanikirana, magulu a polar omwe amamatiridwa pamwamba pa tinthu ta EPS amalumikizana ndi tinthu ta simenti ndikuphatikizana bwino, kotero kuti kugwira ntchito kwa matope oteteza a EPS kumawonjezeka kwambiri. Izi zikuwonekera chifukwa chakuti tinthu ta EPS timanyowa mosavuta ndi simenti, ndipo mphamvu yolumikizana pakati pa awiriwa imakula kwambiri.
Ufa wa emulsion ndi ufa wa latex wothiranso umatha kupanga mphamvu yayikulu yogwirana ndi mphamvu yolumikizirana pazipangizo zosiyanasiyana pambuyo popanga filimu, amagwiritsidwa ntchito ngati chomangira chachiwiri mu matope kuti chiphatikizidwe ndi simenti yothiranso zinthu zosapangidwa, simenti ndi polima motsatana. Perekani mphamvu zonse zomwe zikugwirizana kuti matope azigwira ntchito bwino. Poona kapangidwe kake ka zinthu zopangidwa ndi polymer-simenti, amakhulupirira kuti kuwonjezera ufa wa latex wothiranso kumatha kupanga mawonekedwe a polymer kukhala filimu ndikukhala gawo la khoma la dzenje, ndikupanga mawonekedwe a matope onse kudzera mu mphamvu yamkati, zomwe zimawongolera mphamvu yamkati ya matope. Mphamvu ya polymer, motero kumawonjezera kupsinjika kwa matope ndikuwonjezera kupsinjika kwakukulu. Kuti aphunzire momwe ufa wa latex wothiransonso umagwirira ntchito kwa nthawi yayitali mu matope, SEM idawona kuti patatha zaka 10, kapangidwe ka polymer mu matope sikasintha, kusunga mgwirizano wokhazikika, mphamvu yopindika komanso yopondereza komanso kuteteza madzi bwino. Njira yopangira mphamvu ya guluu wa matailosi inaphunziridwa pa ufa wa latex wotha kusungunukanso, ndipo zinapezeka kuti polima atauma kukhala filimu, filimu ya polima imapanga mgwirizano wosinthasintha pakati pa matope ndi matailosi mbali imodzi, ndipo mbali inayo, Polima yomwe ili mu matope imawonjezera mpweya mu matope ndipo imakhudza mapangidwe ndi kunyowa kwa pamwamba, ndipo pambuyo pake panthawi yokhazikitsa, polima imakhalanso ndi mphamvu yabwino pa njira yothira madzi ndi kuchepa kwa simenti mu chomangira. Zonsezi zithandiza kukulitsa mphamvu ya mgwirizano.
Kuonjezera ufa wa latex wosungunukanso ku matope kungathandize kwambiri kulimbitsa mgwirizano ndi zinthu zina, chifukwa ufa wa latex wophimbidwa ndi madzi ndi gawo lamadzimadzi la simenti yoyimitsidwa zimalowa m'mabowo ndi m'mitsempha yamagazi ya matrix, ndipo ufa wa latex umalowa m'mabowo ndi m'mitsempha yamagazi. Filimu yamkati imapangidwa ndikumatiridwa mwamphamvu pamwamba pa substrate, motero kuonetsetsa kuti pali mgwirizano wabwino pakati pa zinthu zomangira simenti ndi substrate.
Nthawi yotumizira: Marichi-09-2023