Da zaran siminti-tushen kayan kara da latex foda lambobin sadarwa ruwa, da hydration dauki fara, da kuma calcium hydroxide bayani da sauri isa jikewa da lu'ulu'u ne precipitated, kuma a lokaci guda, ettringite lu'ulu'u da calcium silicate hydrate gels an kafa. A m barbashi ana ajiye a kan gel da unhydrated siminti barbashi. Yayin da yanayin hydration ya ci gaba, samfuran hydration suna ƙaruwa, kuma ƙwayoyin polymer suna taruwa a hankali a cikin ramukan capillary, suna samar da wani nau'i mai yawa a saman gel ɗin da kuma kan barbashi na siminti mara ruwa.
Abubuwan da aka tattara na polymer a hankali suna cika pores, amma ba gaba ɗaya zuwa saman ciki na pores ba. Yayin da ake ƙara rage ruwa ta hanyar hydration ko bushewa, ƙwayoyin polymer da ke kusa da su a kan gel kuma a cikin pores sun haɗu a cikin fim mai ci gaba, suna samar da cakuda mai shiga tsakani tare da man siminti mai hydrated da inganta hydration Bonding na samfurori da tarawa. Saboda samfuran hydration tare da polymers suna samar da murfin rufewa a cikin dubawa, yana iya rinjayar haɓakar ettringite da ƙananan lu'ulu'u na calcium hydroxide; kuma saboda polymers suna tattarawa a cikin fina-finai a cikin ramuka na yanki na tsaka-tsakin tsaka-tsaki, kayan da aka yi da siminti na polymer Yankunan canji ya fi yawa. Ƙungiyoyi masu aiki a cikin wasu kwayoyin polymer za su kuma samar da halayen haɗin kai tare da Ca2 + da A13 + a cikin samfurori na siminti don samar da gada na musamman, inganta tsarin jiki na kayan da aka yi da suminti, rage damuwa na ciki, da kuma rage tsararrun microcracks. Yayin da tsarin simintin gel ɗin ya haɓaka, ana cinye ruwa kuma ana ɓoye ƙwayoyin polymer a hankali a cikin pores. Yayin da ciminti ya ƙara hydrated, danshi a cikin pores capillary yana raguwa, kuma ƙwayoyin polymer suna haɗuwa a saman samfurin siminti hydration gel / unhydrated siminti barbashi da kuma tara, game da shi forming ci gaba-cushe Layer tare da manyan pores Cike. tare da m ko kai m barbashi polymer.
Matsayin redispersible latex foda a turmi ana sarrafawa ta hanyar matakai biyu na hydration na ciminti da kuma samar da fim na polymer. Samuwar tsarin hada-hadar siminti hydration da samar da fim ɗin polymer an kammala shi cikin matakai 4:
(1) Bayan an haɗe foda na latex wanda za'a iya tarwatsawa tare da turmi siminti, an tarwatsa shi daidai a cikin tsarin;
(2) A polymer barbashi ana ajiye a kan saman da siminti hydration samfurin gel / unhydrated ciminti barbashi cakuda;
(3) Ƙaƙƙarfan ƙwayar polymer suna samar da ci gaba mai ci gaba kuma mai ɗorewa;
(4) A lokacin aikin siminti hydration tsari, da cushe polymer barbashi a hankali cushe a cikin wani ci gaba da fim, bonding da hydration kayayyakin tare da samar da wani cikakken cibiyar sadarwa tsarin.
A tarwatsa emulsion na redispersible latex foda iya samar da ruwa-insoluble ci gaba da fim (polymer cibiyar sadarwa jiki) bayan bushewa, da kuma wannan low na roba modulus polymer cibiyar sadarwa jiki iya inganta yi na ciminti; A lokaci guda kuma, a cikin kwayoyin halitta na polymer Wasu ƙungiyoyin polar a cikin siminti suna amsa sinadarai tare da samfuran hydration na siminti don samar da gadoji na musamman, inganta tsarin jiki na samfuran hydration na siminti, da ragewa da rage haɓakar ƙirƙira. Bayan an ƙara foda mai sake tarwatsawa, adadin ruwa na farko na simintin yana raguwa, kuma fim ɗin polymer na iya nannade ɓangaren simintin gaba ɗaya ko gaba ɗaya, ta yadda simintin ya sami ruwa sosai kuma ana iya inganta kayansa daban-daban.
Redispersible latex foda yana taka muhimmiyar rawa a matsayin ƙari ga turmi gini. Ƙara redispersible latex foda a cikin turmi iya shirya daban-daban turmi kayayyakin kamar tayal m, thermal rufi turmi, kai matakin turmi, putty, plastering turmi, na ado turmi, jointing wakili, gyara turmi da waterproof sealing abu, da dai sauransu aikace-aikace ikon yinsa da aikace-aikace. aikin turmi gini. Tabbas, akwai matsalolin daidaitawa tsakanin redispersible latex foda da ciminti, admixtures da admixtures, wanda ya kamata a ba da isasshen hankali a cikin takamaiman aikace-aikace.
Lokacin aikawa: Maris 14-2023