Kayan aikin Redispersible Emulsion Powder a Dry Mix Turmi

Redispersible latex foda da sauran inorganic adhesives (kamar sumunti, slaked lemun tsami, gypsum, yumbu, da dai sauransu) da kuma daban-daban aggregates, fillers da sauran Additives [kamar hydroxypropyl methylcellulose, polysaccharide (sitaci ether), fiber Fiber, da dai sauransu] an yi. cikin busassun turmi gauraye ta hanyar hadawa ta jiki. 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. A abun da ke ciki na roba foda yana da daban-daban effects a kan rheological Properties na turmi da kuma daban-daban gina Properties: da dangantaka da latex foda zuwa ruwa a lõkacin da aka redispersed, daban-daban viscosities na latex foda bayan watsawa, da tasiri a kan iska abun ciki. na turmi da rarraba kumfa na iska, Haɗin kai tsakanin foda foda da sauran additives yana sanya nau'ikan latex daban-daban suna da tasirin ƙara yawan ruwa, haɓaka thixotropy, da haɓaka danko.

An yi imani da cewa tsarin redispersible latex foda don inganta workability na sabo turmi ne: dangantaka da latex foda, musamman m colloid, zuwa ruwa a lokacin da aka tarwatsa, ƙara danko na slurry, da kuma inganta cohesion na turmi gini.

Bayan sabon turmi mai gauraya mai dauke da latex foda tarwatsewa ya samu, tare da shayar da ruwa ta saman tushe, da amfani da hydration dauki, da volatilization zuwa iska, ruwa zai ragu sannu a hankali, da guduro barbashi za su kusanci a hankali, da dubawa. a hankali za su blur, kuma resins za su haɗu da juna a hankali. ƙarshe polymerized a cikin wani fim. 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 watsawa (wani lokaci ana kiran kai-manne) na ƙwayoyin polymer don samar da 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 polymer da za a iya sakewa don samar da fim a cikin turmi mai tauri, yana da muhimmanci a tabbatar da cewa mafi ƙarancin zafin jiki na fim (MFT) ya fi ƙasa da zafin jiki na turmi.

Colloid - polyvinyl barasa dole ne a rabu da tsarin fim na polymer. Wannan ba matsala ba ne a tsarin turmi na simintin alkaline, saboda polyvinyl barasa za a saponified ta alkali da aka samar ta hanyar siminti hydration, da adsorption na quartz abu zai rabu da polyvinyl barasa a hankali daga tsarin, ba tare da hydrophilic colloid kariya. , Fim ɗin da aka kafa ta hanyar watsawa na lokaci ɗaya na redispersible latex foda, wanda kanta ba shi da narkewa a cikin ruwa, zai iya aiki ba kawai a cikin yanayin bushe ba, amma har ma a cikin yanayin nutsewar ruwa na dogon lokaci. Tabbas, a cikin tsarin da ba na alkaline ba, irin su gypsum ko tsarin filler-kawai, saboda polyvinyl barasa har yanzu yana wanzu a cikin fim ɗin polymer na ƙarshe, wanda ke shafar juriya na ruwa na fim ɗin, lokacin da ba a amfani da waɗannan tsarin don ruwa na dogon lokaci. nutsewa , kuma polymer har yanzu yana da ƙayyadaddun kayan aikin injiniya na musamman, kuma ana iya amfani da foda polymer foda har yanzu a cikin waɗannan tsarin.

Tare da samuwar fim ɗin polymer na ƙarshe, an samar da tsarin da ya ƙunshi inorganic and Organic binder Tsarin a cikin turmi da aka warke, wato, kwarangwal da wuyar kwarangwal wanda ya hada da kayan aikin ruwa, kuma foda mai iya tarwatsewa yana samar da fim tsakanin rata da m surface. m cibiyar sadarwa. Ƙarfin ƙarfi da haɗin kai na fim ɗin resin polymer wanda aka kafa ta latex foda yana haɓaka. Saboda sassaucin ra'ayi na polymer, ƙarfin nakasar ya fi girma fiye da na dutsen siminti mai tsauri, aikin nakasar turmi yana inganta, kuma tasirin tarwatsa damuwa yana inganta sosai, don haka inganta juriya na turmi. .

Tare da karuwar abun ciki na foda na latex wanda za'a iya rarrabawa, tsarin duka yana tasowa zuwa filastik. A cikin yanayin babban abun ciki na latex foda, lokaci na polymer a cikin turmi da aka warke sannu a hankali ya wuce lokacin samfurin hydration na inorganic, kuma turmi zai fuskanci canji mai mahimmanci kuma ya zama elastomer, yayin da samfurin hydration na ciminti ya zama "filler". “. Ƙarfin ƙwanƙwasa, elasticity, sassauƙa da hatimin turmi wanda aka gyara ta hanyar sake tarwatsa foda na latex duk an inganta su. Haɗuwa da foda mai iya tarwatsawa yana ba da damar fim ɗin polymer (fim ɗin latex) ya samar da kuma samar da wani ɓangare na bangon ramuka, ta haka ne ke rufe tsarin turmi sosai. Membran latex yana da tsarin mikewa da kansa wanda ke haifar da tashin hankali inda aka makala shi zuwa turmi. Ta hanyar waɗannan dakarun cikin gida, ana kiyaye turmi gaba ɗaya, ta haka yana ƙara ƙarfin haɗin kai na turmi. Kasancewar gyare-gyaren gyare-gyare mai sauƙi da ƙwaƙƙwarar polymers yana inganta haɓaka da haɓakar turmi.

Hanyar haɓakar haɓakar haɓakar yawan amfanin ƙasa da ƙarfin gazawar ita ce kamar haka: lokacin da aka yi amfani da ƙarfi, ana jinkirta microcracks har sai an sami matsananciyar damuwa saboda ingantaccen sassauci da haɓaka. Bugu da kari, wuraren da aka sakar na polymer suma suna hana haduwar microcracks zuwa shiga fasa. Sabili da haka, foda na polymer wanda za'a iya tarwatsawa yana inganta haɓakar rashin ƙarfi da rashin ƙarfi na kayan aiki.

Fim ɗin polymer a cikin turmi gyare-gyare na polymer yana da tasiri mai mahimmanci akan taurin turmi. Ƙwararren latex foda wanda za'a iya rarrabawa akan mahaɗin yana taka muhimmiyar rawa bayan tarwatsawa da yin fim, wanda shine ƙara haɓakawa ga kayan da aka tuntube. A cikin microstructure na foda polymer modified tayal bonding turmi da tayal dubawa, fim din da aka kafa da polymer samar da wata gada tsakanin vitrified fale-falen buraka tare da matsananciyar sha ruwa da siminti turmi matrix. Yankin tuntuɓar tsakanin abubuwa guda biyu da ba su da kamanni wuri ne mai haɗari musamman don raguwar fasa don haifar da haifar da asarar haɗin kai. Sabili da haka, ikon fina-finai na latex don warkar da raguwar raguwa yana da mahimmanci ga mannen tayal.

A lokaci guda kuma, foda mai iya tarwatsewa mai ɗauke da ethylene yana da fitattun mannewa ga abubuwan da ke tattare da kwayoyin halitta, musamman makamancinsu, irin su polyvinyl chloride da polystyrene. Misali mai kyau shine lokacin da yazo da masks.