1 Gabatarwa
Adhesive na tushen siminti a halin yanzu shine mafi girman aikace-aikacen turmi mai bushe-bushe na musamman, wanda ya ƙunshi siminti a matsayin babban kayan siminti kuma an ƙara shi ta hanyar tarawa masu daraja, wakilai masu riƙe ruwa, wakilai masu ƙarfi na farko, foda latex da sauran abubuwan da ake buƙata na Organic ko inorganic. cakuda.Gabaɗaya, kawai yana buƙatar a haɗa shi da ruwa lokacin amfani da shi.Idan aka kwatanta da turmi na siminti na yau da kullun, yana iya haɓaka ƙarfin haɗin gwiwa sosai tsakanin kayan da ke fuskantar fuska da juriya, kuma yana da tsayayyar zamewa mai kyau da ingantaccen ruwa da juriya na ruwa.An fi amfani dashi don liƙa kayan ado kamar ginin bango na ciki da na waje, fale-falen fale-falen buraka, da sauransu. Ana amfani da shi sosai a bangon ciki da na waje, benaye, dakunan wanka, kicin da sauran wuraren ado na gini.A halin yanzu shine mafi yawan amfani da kayan haɗin gwiwa na Tile.
Yawancin lokaci idan muka yi la'akari da aikin mannen tayal, ba wai kawai kula da aikin sa ba da ikon hana zamewa, amma kuma kula da ƙarfin injinsa da lokacin buɗewa.Cellulose ether a cikin tayal m ba kawai yana rinjayar rheological Properties na ain m, kamar santsi aiki, danko wuka, da dai sauransu, amma kuma yana da karfi tasiri a kan inji Properties na tayal m.
2. Tasiri akan lokacin buɗewa na tile m
Lokacin da foda foda da cellulose ether suka kasance a cikin rigar turmi, wasu samfuran bayanan sun nuna cewa foda na roba yana da ƙarfin kuzarin motsa jiki don haɗawa da samfuran hydration na siminti, kuma ether cellulose ya kasance mafi a cikin ruwa mai tsaka-tsaki, wanda ke rinjayar ƙarin turmi danko da lokacin saita lokaci.Tashin hankali na ether na cellulose ya fi na foda na roba, kuma ƙarin haɓakar ether cellulose akan turmi zai zama da amfani ga samuwar haɗin hydrogen tsakanin tushen tushe da ether cellulose.
A cikin rigar turmi, ruwan da ke cikin turmi yana ƙafe, kuma ana wadatar da ether na cellulose a saman, kuma za a samar da fim a saman turmin a cikin minti 5, wanda zai rage yawan fitar da ruwa na gaba, kamar yadda ruwa ya fi yawa. an cire shi daga turmi mai kauri Sashe na shi yana ƙaura zuwa ƙaramin turmi mai ɗanɗano, kuma fim ɗin da aka kafa a farkon ya narkar da wani yanki, kuma ƙaurawar ruwa zai kawo ƙarin haɓakar ether cellulose akan turmi.
Sabili da haka, samar da fim din cellulose ether a saman turmi yana da tasiri mai girma akan aikin turmi.1) Fim ɗin da aka kafa yana da bakin ciki sosai kuma za a narkar da shi sau biyu, wanda ba zai iya ƙayyade ƙashin ruwa ba kuma ya rage ƙarfin.2) Fim ɗin da aka kafa yana da kauri sosai, ƙaddamar da ether na cellulose a cikin ruwa mai tsaka-tsakin turmi yana da girma, kuma danko yana da girma, don haka ba shi da sauƙi a karya fim ɗin saman lokacin da aka liƙa tayal.Ana iya ganin cewa abubuwan da ke samar da fim na ether cellulose suna da tasiri mafi girma akan lokacin budewa.Nau'in ether cellulose (HPMC, HEMC, MC, da dai sauransu) da kuma digiri na etherification (digiri na maye gurbin) kai tsaye yana shafar abubuwan da ke samar da fim na cellulose ether, da taurin da taurin fim din.
3. Tasiri akan ƙarfin zane
Baya ga ba da abubuwan fa'ida da aka ambata a sama zuwa turmi, ether cellulose kuma yana jinkirta jinkirin motsin siminti.Wannan sakamako na retarding yafi saboda adsorption na cellulose ether kwayoyin akan nau'o'in ma'adinai daban-daban a cikin tsarin siminti ana shayar da su, amma gabaɗaya magana, ijma'i shine cewa kwayoyin ether cellulose sun fi shafa akan ruwa kamar CSH da calcium hydroxide.A kan samfuran sinadarai, ba kasafai ake tallata shi akan ainihin lokacin ma'adinai na clinker ba.Bugu da ƙari, ether cellulose yana rage motsi na ions (Ca2 +, SO42-, ...) a cikin maganin pore saboda karuwa a cikin danko na maganin pore, don haka ya kara jinkirta tsarin hydration.
Danko wani muhimmin siga ne, wanda ke wakiltar halayen sinadarai na ether cellulose.Kamar yadda aka ambata a sama, danko yafi rinjayar ikon riƙe ruwa kuma yana da tasiri mai mahimmanci akan aikin sabon turmi.Duk da haka, nazarin gwaji ya gano cewa danko na ether cellulose ba shi da wani tasiri a kan ciminti hydration kinetics.Nauyin kwayoyin halitta yana da ɗan tasiri akan hydration, kuma matsakaicin bambanci tsakanin nau'ikan nau'ikan kwayoyin halitta shine kawai 10min.Saboda haka, nauyin kwayoyin ba shine mahimmin ma'auni don sarrafa ruwan siminti ba.
"Aikace-aikacen Cellulose Ether a cikin Samfuran Busassun Haɗaɗɗen Turmi Na Siminti" ya nuna a sarari cewa jinkirin ether cellulose ya dogara da tsarin sinadarai.Kuma gabaɗayan yanayin da aka kammala shine cewa ga MHEC, mafi girman matakin methylation, ƙaramar tasirin ether cellulose.Bugu da ƙari, sakamakon jinkirta maye gurbin hydrophilic (kamar maye gurbin zuwa HEC) ya fi karfi fiye da na maye gurbin hydrophobic (kamar maye gurbin zuwa MH, MHEC, MHPC).
A cikin gwajin, mun yi la'akari da HPMC, wanda shine fili ether.Ga HPMC, yana buƙatar wani takamaiman matakin sha don tabbatar da narkewar ruwa da watsa haske.Mun san cewa abun ciki na maye gurbin kuma yana ƙayyade zafin gel na HPMC, wato, Yana ƙayyade yanayin amfani na HPMC, don haka abun cikin rukuni na HPMC wanda yawanci ana amfani dashi ana tsara shi a cikin kewayon.A cikin wannan kewayon, yadda ake haɗa methoxy da hydroxypropoxy don cimma sakamako mafi kyau shine abun ciki na bincikenmu.A cikin wani takamaiman kewayon, haɓakar abun ciki na ƙungiyoyin methoxyl zai haifar da haɓakar ƙasa a cikin ƙarfin cirewa, yayin da haɓaka abun ciki na ƙungiyoyin hydroxypropoxyl zai haifar da haɓaka ƙarfin cirewa.Akwai irin wannan tasirin don lokutan buɗewa.
Canjin canjin ƙarfin injin a ƙarƙashin yanayin buɗe lokacin buɗewa ya dace da yanayin yanayin zafin jiki na yau da kullun, wanda kuma ya dace da tauri na fim ɗin ether cellulose da muka yi magana game da shi a cikin Sashe na 2. Abin da ke cikin methyl (DS) yana da girma kuma hydroxypropoxyl. HPMC tare da ƙananan (MS) abun ciki yana da kyau taurin fim ɗin, amma zai shafi wettability na rigar turmi zuwa saman kayan.
Lokacin aikawa: Janairu-30-2023