Redispersible latex ufandi mafuta odzola osinthidwa omwe amapezeka mwa kuyanika kwa binary kapena ternary copolymer ya vinylacetase ndi ethylene tert carbonate VoVa kapena alkene kapena acrylic acid. Ili ndi redispersibility yabwino, ndipo imatha kupangidwanso kukhala mafuta odzola ikalumikizana ndi madzi, ndipo mankhwala ake amafanana ndi mafuta odzola oyamba.
Kafukufuku wa ufa wa latex wopangidwanso adayamba mu 1934 ndi IG Farbenindus AC ku Germany polyvinylidene acid redispersible latex powder.
Ndipo Japanese ufa latex. Nkhondo yachiwiri ya padziko lonse itatha, panali kuchepa kwakukulu kwa ntchito ndi zomangamanga, zomwe zinakakamiza Ulaya, makamaka Germany, kugwiritsa ntchito zipangizo zosiyanasiyana zomangira ufa kuti apititse patsogolo ntchito yomanga. Chakumapeto kwa zaka za m'ma 1950, Germany's Hearst Company ndi Wacker Chemical Company idayamba kupanga mafakitale a ufa wa latex. Panthawiyo, ufa wopangidwanso ndi latex udali wamtundu wa polyvinyl acetate, womwe umagwiritsidwa ntchito ngati zomatira, zomatira pakhoma, ndi zida za simenti. Komabe, chifukwa cha zofooka za PVAc zomatira ufa wapamwamba kwambiri kutentha filimu kupanga, osauka madzi kukana, ndi osauka alkali kukana, ntchito yake ndi yochepa kwambiri.
Ndikuchita bwino kwamakampani odzola a VAE ndi mafuta odzola a VA/VeoVa,redispersible emulsion ufandi kutentha kochepa komwe kumapanga filimu ya 0C, kukana madzi abwino komanso kukana kwa alkali kunayambika m'ma 1960. Pambuyo pake, kugwiritsa ntchito kwake kunalimbikitsidwa kwambiri ku Europe, ndipo kuchuluka kwake kunakula pang'onopang'ono kupita ku zomatira zosiyanasiyana zomangira komanso zosamangika, kusinthidwa kwamatope owuma, kutchinjiriza khoma ndi kumaliza kachitidwe, screed pakhoma ndi pulasitala yosindikiza. .
Kupanga kwapakhomo kwa redispersible latex ufa M'zaka zaposachedwa, kufunika kwaredispersible latex ufaku Europe ndi North America wakula pang'onopang'ono. M'malo mwake, ndi kukhazikitsidwa kwapang'onopang'ono kwa mfundo zosungira mphamvu zomanga ku China komanso kulimbikitsa mwamphamvu matope osakanizika a nyumba, kugwiritsa ntchito ufa wa latex wopangidwanso ku China kwakula kwambiri. Makampani akunja ndi mabizinesi akunyumba nawonso akhazikitsanso ntchito za ufa wa latex wogawanika m'dziko lonselo. Malinga ndi ziwerengero zoyenera za akatswiri, mu 2003, kupanga padziko lonse lapansi kwa ufa wa latex wopangidwanso kunali matani 190000, omwe amagwiritsidwa ntchito ku Europe ndi North America. Kumwa pamsika waku China kunali kochepera matani 5000. Komabe, mu 2007, kugwiritsidwa ntchito pamsika kwa ufa wa latex wopangidwanso ku China kudafikira matani 450000, ndipo ogulitsa kwambiri anali Dalian Chemical, Wacker waku Germany, ndi National Starch ochokera ku United States. Zimanenedweratu kuti pofika chaka cha 2010, kufunikira kwa ufa wa latex ku China kudzafika matani 100000.
Mitundu ya ufa wa latex wopangidwanso:
Mitundu yayikulu ya ufa wa latex womwe umagwiritsidwanso ntchito pamsika ndi:
Vinyl acetate ndi ethylene copolymer ufa (Vac/E), ethylene ndi vinyl chloride, ndi montmorillonite ethylene ternary copolymer powder (E/Vc/VL), vinilu acetate ndi ethylene ndi apamwamba mafuta acid ethylene ternary copolymer ufa (Vac/E/Vero) , vinyl acetate ndi apamwamba mafuta acid ethylene copolymer ufa (Vac/VeoVa), acrylic acid ndi ethylene copolymer powder (A/S), vinyl acetate ndi acrylic acid, ndi apamwamba mafuta asidi ethylene copolymer ufa (Vac/A/VeoVa) Cool acid ethylene cool homopolymer rabara ufa (PVac) , styrene butadiene copolymer rabara ufa (SBR), etc.
Mapangidwe a ufa wa latex wopangidwanso:
* Redispersible latex powder nthawi zambiri amakhala ufa woyera, koma palinso mitundu ina yochepa yomwe ilipo. Zigawo zake zikuphatikizapo: * Polymer resin: yomwe ili pakatikati pa tinthu tating'ono ta mphira, ndiyenso gawo lalikulu lomwe lingagwiritsidwe ntchito kufalitsa ufa wa latex.
* Zowonjezera (zamkati): Zogwiritsidwa ntchito limodzi ndi utomoni kusintha utomoni.
* Zowonjezera (zakunja): Kuti muwonjezere magwiridwe antchito a ufa wa latex, zida zowonjezera zimawonjezeredwa.
Chitetezo cha Colloid:
Wosanjikiza wa zinthu za hydrophilic atakulungidwa pamwamba pa tinthu tating'onoting'ono ta latex powder, zambiri zomwe zimatha kupangidwanso.
Colloid yoteteza ya ufa wobalalika wa latex ndi mowa wa polyvinyl.
Anti-caking agent: Fine mineral filler yomwe imagwiritsidwa ntchito kwambiri poletsa kuyika kwa ufa wa rabara panthawi yosungira ndi kunyamula, ndikuwongolera kutuluka kwa ufa wa rabara (kutaya m'matumba a mapepala kapena magalimoto akasinja)
Udindo waRDP:
* The redispersible latex ufa umapanga filimu pambuyo kubalalitsidwa ndipo imakhala ngati zomatira zachiwiri kukulitsa mphamvu zake;
* Colloid yoteteza imatengedwa ndi matope (sidzawonongeka ndi madzi pambuyo popanga filimu, kapena "kubalalitsidwa kwachiwiri":
*Utomoni wopanga filimu wopangidwa ndi polima umagawidwa ngati chinthu cholimbikitsira mumtundu wonse wamatope, potero kumawonjezera kulumikizana kwamatope:
Kayendetsedwe kazinthu:
Redispersible latex ufa amapangidwa ndi polima lotion poyanika kupopera. Pambuyo kusakaniza ndi madzi mu matope, ndi emulsified ndi kumwazikana m'madzi kupanga khola polima lotion kachiwiri. Pambuyo redispersible latex ufa ndi emulsified ndi omwazikana m'madzi, madzi amasanduka nthunzi, kupanga polima filimu mu matope kusintha ntchito ya matope. Ufa wosiyanasiyana wopangidwanso ndi latex umakhala ndi zotsatira zosiyanasiyana pamatope a ufa wowuma. Powonjezera kukana kwamphamvu, kulimba, komanso kukana kwamatope, tinthu tating'onoting'ono tomatira timadzaza ma pores a matope, kukulitsa kuphatikizika kwake ndikuwongolera kukana kwake. Pansi pa mphamvu zakunja, zidzatulutsa mpumulo popanda kuonongeka. Mafilimu omatira a polima amatha kukhalapo mpaka kalekale m'makina amatope. Kupititsa patsogolo ntchito yomanga matope.
Pali mphamvu yothira mafuta pakati pa tinthu tating'onoting'ono ta polima zomatira ufa, zomwe zimalola kuti zigawo zamatope ziziyenda paokha, pomwe zomatira zomatira zimakhala ndi mphamvu yopangitsa mpweya, p.rovide compressibility ya matope ndikuwongolera magwiridwe antchito pakumanga. Kupititsa patsogolo mphamvu ya mgwirizano ndi mgwirizano wamatope.
Pambuyo kujambula ndiredispersible latex ufamonga organic binder, imatha kupanga mphamvu zamakokedwe apamwamba komanso mphamvu zomatira pamagawo osiyanasiyana. Imagwira ntchito yofunikira pakuphatikizana pakati pa matope ndi zinthu zakuthupi (EPS, bolodi lotulutsa thovu) ndi gawo lapansi losalala. Mafilimu opangidwa ndi polymer adhesive ufa amagawidwa ngati kulimbikitsa zinthu mumatope onse, ndikuwonjezera kugwirizana kwa matope. Kupititsa patsogolo kukana kwanyengo, kukana kuzizira, komanso kupewa kusweka kwa matope, redispersible latex ufa ndi wa thermoplastic resin, yomwe imatha kusinthasintha bwino ndipo imatha kupangitsa kuti matopewo agwirizane ndi kuzizira kwakunja ndi kusintha kwa chilengedwe chotentha, kuteteza bwino kusweka kwamatope chifukwa cha kusiyana kwa kutentha. . Pokonza hydrophobicity ya matope ndi kuchepetsa kuyamwa kwa madzi, ufa wa latex ukhoza kumwazidwanso kupanga filimu pa pore ndi pamwamba pa matope. Filimu yomatira ya polima sidzabalalitsidwanso pambuyo pokumana ndi madzi, kuletsa kuwukira kwamadzi ndikuwongolera kusakwanira kwake. Special redispersible latex ufa ndi hydrophobic kwenikweni ali bwino hydrophobic kwenikweni. Kupititsa patsogolo mphamvu yopindika ndi mphamvu yosinthika yamatope.
Ntchito yamalonda:
Dongosolo lotsekera khoma lakunja:
Chomangira matope: Onetsetsani kuti matope amamatira khoma ku bolodi la EPS. Wonjezerani mphamvu yolumikizana.
Pulakitala matope: Onetsetsani mphamvu zamakina, kukana ming'alu, kulimba, komanso kukana kwamakina otsekemera.
Joint filler: Kusakwanira kwa matope kutikupewa kulowerera kwa madzi. Nthawi yomweyo, imakhala yomatira bwino ndi m'mphepete mwa matailosi a ceramic, kutsika kochepa, komanso kusinthasintha.
Kukonzanso matailosi ndi matabwa pulasitala putty: Kupititsa patsogolo kumamatira ndi kumangiriza mphamvu ya putty pa magawo apadera (monga matailosi a ceramic, zojambulajambula, plywood, ndi malo ena osalala), kuwonetsetsa kuti putty ili ndi kusinthasintha kwabwino kuti iwononge kukula kwa gawo lapansi.
Masonry ndi pulasitala matope: Konzani kasungidwe ka madzi. Chepetsani kutayika kwa madzi pamabowo.
Tondo la simenti lopanda madzi:Onetsetsani kuti matope akumatira amadzi, komanso amamatira bwino ndi pansi, ndikuwongolera mphamvu yopondereza komanso yosinthika yamatope.
Tondo wodziyimira pawokha:Onetsetsani kufananiza kwa zotanuka modulus matope, komanso kukana kupindika ndi kusweka. Limbikitsani kukana kuvala, mphamvu yomangirira, ndi kulumikizana kwamatope.
Interface matope:Limbikitsani mphamvu ya pamwamba pa gawo lapansi ndikuwonetsetsa kuti matope amalumikizana mwamphamvu.
Mkati ndi kunja kwa khoma putty:Limbikitsani mphamvu yomangira ya putty ndikuwonetsetsa kuti ili ndi kusinthasintha kwina kuti muchepetse kukulitsa ndi kupsinjika kosiyanasiyana kopangidwa ndi zigawo zosiyanasiyana.Onetsetsani kuti putty ili ndi kukana kukalamba bwino, kusasunthika, komanso kukana chinyezi.
Konzani matope:Onetsetsani kuti kukulitsa kwa matope kumagwirizana ndi gawo lapansi, ndikuchepetsa zotanuka za matope. Onetsetsani kuti matope ali ndi hydrophobicity yokwanira, kupuma, komanso mphamvu yolumikizana.
Zomata matailosi ndi ophatikizana kudzaza:Zomatira matailosi: zimapereka kulumikizana kwamphamvu kwamatope, kumapereka kusinthasintha kokwanira kuti muchepetse ma coefficients osiyanasiyana owonjezera amafuta a gawo lapansi ndi matayala a ceramic. Limbikitsani kuphweka kwa ntchito zomanga ndikuwongolera magwiridwe antchito
Nthawi yotumiza: Oct-08-2023