Kugwirizana kwa ufa wa latex m'madzi akamamwanso, kukhuthala kosiyanasiyana kwa ufa wa latex pambuyo kubalalitsidwa, kukhudzidwa kwa mpweya wamatope ndi kugawa kwa thovu la mpweya, kuyanjana pakati pa ufa wa rabara ndi zina zowonjezera, ndi zina zotero, zimapanga zosiyana. latex ufa wawonjezera madzimadzi. , Wonjezerani thixotropy, kuwonjezera mamasukidwe akayendedwe ndi zina zotero.
Limbikitsani magwiridwe antchito
Nthawi zambiri amakhulupirira kuti redispersible latex ufa bwino workability wa matope mwatsopano: ufa wa latex, makamaka zoteteza colloid, ali ndi kuyanjana kwa madzi ndi kumawonjezera mamasukidwe akayendedwe a slurry ndi bwino kugwirizana kwa zomangamanga matope. Pambuyo pa matope osakanikirana omwe ali ndi latex powder dispersion apangidwa, ndi kuyamwa kwa madzi ndi pansi pamtunda, kugwiritsira ntchito hydration reaction, ndi kuphulika kwa mpweya, madzi adzachepa pang'onopang'ono, tinthu tating'onoting'ono timayandikira, mawonekedwewo adzatha. Pang'onopang'ono amawonongeka, ndipo pang'onopang'ono adzalumikizana wina ndi mzake ndipo pamapeto pake amaphatikizana. kupanga mafilimu. Njira yopanga filimu ya polima imagawidwa m'magawo atatu. Mu gawo loyamba, polima particles kusuntha momasuka mu mawonekedwe a Brownian zoyenda mu koyamba emulsion. Madzi akamasanduka nthunzi, kusuntha kwa tinthu ting’onoting’ono kumakhala koletsedwa mwachibadwa, ndipo kukangana kwapakati pa madzi ndi mpweya kumawachititsa kuti agwirizane pang’onopang’ono. Mu gawo lachiwiri, pamene tinthu tating'onoting'ono tayamba kukhudzana wina ndi mzake, madzi mu maukonde amasanduka nthunzi kudzera mu capillary, ndipo kuthamanga kwa capillary komwe kumagwiritsidwa ntchito pamwamba pa tinthu tating'onoting'ono kumapangitsa kuti mapindikidwe a latex spheres agwirizane, ndipo madzi otsala amadzaza pores, ndipo filimuyo pafupifupi anapanga. Gawo lachitatu, lomaliza limalola kufalikira (nthawi zina kumatchedwa kudziphatika) kwa mamolekyu a polima kuti apange filimu yeniyeni yopitilira. Pakupanga filimu, tinthu tating'onoting'ono ta latex tating'onoting'ono timaphatikizana kukhala gawo latsopano la kanema wokhala ndi kupsinjika kwakukulu. Mwachiwonekere, kuti athe redispersible latex ufa kupanga filimu mu matope owuma, m'pofunika kuonetsetsa kuti osachepera filimu kupanga kutentha (MFT) ndi otsika kuposa kuchiritsa kutentha kwa matope.
Wonjezerani kupsinjika kwa zinthu
Ndi mapangidwe omaliza a filimu ya polima, dongosolo lopangidwa ndi zinthu zopanda organic ndi organic binder, ndiko kuti, chigoba chophwanyika komanso cholimba chopangidwa ndi zida zamagetsi, ndi filimu yopangidwa ndi ufa wopangidwa ndi redispersible latex ufa mumipata ndi malo olimba amapangidwa mu matope ochiritsidwa. flexible network. Kulimba kwamphamvu ndi kulumikizana kwa filimu ya utomoni wa polima yopangidwa ndi ufa wa latex kumakulitsidwa. Chifukwa cha kusinthasintha kwa polima, mphamvu yopindika ndiyokwera kwambiri kuposa momwe miyala ya simenti yolimba, kusinthika kwa matope kumatheka, ndipo zotsatira za kubalalitsa kupsinjika zimakula bwino, potero kuwongolera kukana kwa matope. . Ndi kuchuluka kwa zili redispersible latex ufa, dongosolo lonse akufotokozera pulasitiki. Pankhani ya high latex ufa okhutira, ndi polima gawo mu matope anachiritsa pang`onopang`ono kuposa inorganic hydration mankhwala gawo, ndi matope adzakhala kusintha Mkhalidwe ndi kukhala elastomer, pamene hydration mankhwala a simenti amakhala "filler". “. Kulimba kwamphamvu, kusinthasintha, kusinthasintha ndi kusindikizidwa kwa matope osinthidwa ndi redispersible latex powder zonse zimakhala bwino. Kusakaniza kwa ufa wa latex wopangidwanso kumapangitsa kuti filimu ya polima (latex film) ipange ndi kupanga gawo la khoma la pore, potero kusindikiza mawonekedwe apamwamba a matope. Nembanemba ya latex imakhala ndi njira yodzitambasulira yokha yomwe imapangitsa kulimba komwe imakhazikika kumatope. Kupyolera mu mphamvu zamkati izi, matope amasungidwa lonse, motero amawonjezera mphamvu yogwirizana ya matope. Kukhalapo kwa ma polima osinthika kwambiri komanso zotanuka kwambiri kumapangitsa kuti matopewo azitha kusinthasintha komanso kusinthasintha. Njira yowonjezerera kupsinjika kwa zokolola ndi kulephera mphamvu ndi motere: pamene mphamvu ikugwiritsidwa ntchito, ma microcracks amachedwa mpaka kupanikizika kwakukulu kufikiridwa chifukwa cha kusinthasintha ndi kusinthasintha. Kuphatikiza apo, madera ophatikizana a polima amalepheretsanso kulumikizana kwa ma microcracks muming'alu yolowera. Choncho, redispersible polima ufa amathandizira kulephera kupsinjika ndi kulephera kwa zinthuzo.
Nthawi yotumiza: Mar-09-2023