Tumi mai busassun busassun ana yin shi ta hanyar haɗa foda mai sake tarwatsewa ta jiki tare da sauran adhesives na inorganic da aggregates iri-iri, masu filaye da sauran abubuwan ƙari. Lokacin da busassun turmi da aka kara a cikin ruwa da kuma motsa, a karkashin aikin hydrophilic colloid m colloid da inji karfi karfi, da latex foda barbashi za a iya da sauri tarwatsa cikin ruwa, wanda ya isa ya samar da cikakken redispersible latex foda a cikin fim.
Abun da ke ciki na latex foda ya bambanta, wanda zai shafi rheology da kayan gini daban-daban na turmi. Alamar latex foda da ruwa lokacin da aka sake tarwatsewa, daban-daban viscosities na latex foda bayan watsawa, tasiri akan abun cikin iska na turmi da rarraba kumfa na iska, hulɗar tsakanin latex foda da sauran additives, da sauransu, sun bambanta. latex powders sun kara yawan ruwa. , Ƙara thixotropy, ƙara danko da sauransu.
Bayan sabon turmi mai gauraya mai dauke da latex foda watsawa an kafa, tare da shayar da ruwa ta saman tushe, da amfani da hydration dauki, da volatilization zuwa iska, ruwa zai ragu sannu a hankali, barbashi za su kusanci sannu a hankali, da dubawa zai. sannu a hankali, kuma a hankali suna haɗuwa da juna, kuma a ƙarshe an haɗa fim ɗin. Tsarin samar da fim ɗin polymer ya kasu kashi uku.
A cikin mataki na farko, ƙwayoyin polymer suna motsawa cikin yardar kaina a cikin nau'i na motsi na Brownian a farkon emulsion. Yayin da ruwa ke ƙafewa, motsin ɓangarorin a zahiri yana ƙara ƙuntatawa, kuma tashin hankali tsakanin ruwa da iska yana tilasta musu su daidaita a hankali tare.
A mataki na biyu, lokacin da barbashi suka hadu da juna, ruwan da ke cikin hanyar sadarwa ya fita ta hanyar tubes na capillary, kuma yawan tashin hankali da ake yi a saman sassan sassan jikin yana haifar da nakasawa na latex spheres don haɗa su tare, kuma. sauran ruwan ya cika pores, kuma fim ɗin yana da ƙima.
Mataki na uku, mataki na ƙarshe yana ba da damar yaduwar ƙwayoyin polymer zuwa fim ɗin ci gaba na gaskiya. A lokacin ƙirƙirar fim, keɓaɓɓen barbashi na latex na wayar hannu suna haɓaka zuwa wani sabon yanayin fim tare da matsanancin damuwa. Babu shakka, don ba da damar foda na latex da za a iya sakewa don samar da fim a cikin turmi mai tauri, ya zama dole a tabbatar da cewa mafi ƙarancin zafin jiki na fim ɗin ya yi ƙasa da yanayin zafin turmi. .
An yi imani da cewa redispersible latex foda inganta workability na sabon turmi: latex foda, musamman ma colloid m, yana da dangantaka da ruwa da kuma ƙara danko na slurry da kuma inganta cohesion na ginin turmi. A cikin turmi, shi ne inganta brittleness, high na roba modules da sauran rauni na gargajiya turmi siminti, da kuma ba da siminti mafi kyau sassauci da kuma juriya bond ƙarfi, ta yadda da tsayayya da kuma jinkirta samar da siminti turmi fasa. Tun da polymer da turmi sun samar da tsarin hanyar sadarwa mai shiga tsakani, ana samar da fim din polymer mai ci gaba a cikin pores, wanda ke ƙarfafa haɗin kai tsakanin haɗuwa da kuma toshe wasu pores a cikin turmi, don haka turmi da aka gyara bayan taurin ya fi turmi ciminti. Akwai babban ci gaba.
Lokacin aikawa: Maris 20-2023