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 ƙwararrun ƙira, wakilai masu riƙe da 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 nasa yana ƙaura zuwa mafi ƙarancin turmi, kuma fim ɗin da aka kafa a farkon ya narkar da wani yanki, kuma ƙaurawar ruwa zai kawo ƙarin. cellulose ether enrichment a kan turmi surface.
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 ƙarar 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.
Ragewar ether cellulose ya dogara da tsarin sinadarai, kuma yanayin gabaɗaya ya kammala cewa, ga MHEC, mafi girman matakin methylation, ƙarancin jinkirin 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). Sakamakon retarding na ether cellulose ya fi shafar sigogi biyu, nau'i da adadin ƙungiyoyi masu maye gurbin.
Gwaje-gwajenmu na yau da kullun kuma sun gano cewa abubuwan da ke maye gurbin suna taka muhimmiyar rawa a ƙarfin injin tile adhesives. Mun kimanta aikin HPMC tare da digiri daban-daban na maye gurbin a cikin tile adhesives, kuma mun gwada tasirin ethers cellulose mai ƙunshe da ƙungiyoyi daban-daban a ƙarƙashin yanayi daban-daban na warkarwa akan Tasiri akan kaddarorin injin tayal adhesives.
A cikin gwajin, mun yi la'akari da HPMC, wanda shine fili ether, don haka dole ne mu sanya hotuna guda biyu tare. Ga HPMC, yana buƙatar wani takamaiman matakin sha don tabbatar da narkewar ruwa da watsa haske. Mun san abun ciki na maye gurbin Yana kuma ƙayyade yawan zafin jiki na gel na HPMC, wanda kuma ke ƙayyade yanayin amfani na HPMC. Ta wannan hanyar, abun cikin rukuni na HPMC wanda galibi ana aiwatarwa 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. Hoto na 2 yana nuna cewa a cikin wani yanki na musamman, haɓakar abubuwan da ke cikin ƙungiyoyin metxyl zai haifar da raguwa a cikin ƙarfin cirewa, yayin da karuwa a cikin ƙungiyoyin hydroxypropoxyl zai haifar da karuwa a cikin ƙarfin cirewa. . Akwai irin wannan tasirin don lokutan buɗewa.
Canjin canjin ƙarfin injina a ƙarƙashin yanayin buɗe lokaci ya yi daidai da wancan ƙarƙashin yanayin yanayin zafi na al'ada. HPMC tare da babban methoxyl (DS) abun ciki da ƙananan hydroxypropoxyl (MS) abun ciki yana da kyau taurin fim, amma zai shafi rigar turmi akasin haka. kayan wetting Properties.
Lokacin aikawa: Janairu-09-2023