Manne tile na tushen siminti shine mafi girman aikace-aikacen turmi-busasshen gauraye na yanzu. Yana da wani nau'i na kwayoyin halitta ko inorganic admixture tare da siminti a matsayin babban kayan siminti kuma an haɗa shi tare da jimlar grading, wakili mai riƙe ruwa, wakili mai ƙarfi da wuri da latex foda. cakuda. Gabaɗaya, kawai yana buƙatar a haɗa shi da ruwa. Idan aka kwatanta da turmi na siminti na yau da kullun, zai iya haɓaka ƙarfin haɗin gwiwa tsakanin kayan da ke fuskantar fuska da ma'auni, yana da kyawawan kayan hana zamewa kuma yana da kyakkyawan juriya na ruwa da juriya mai zafi. Har ila yau, ana amfani da shi don kayan ado na ciki da na waje na bangon bango, fale-falen bene da sauran kayan ado. An yi amfani da shi sosai a cikin kayan ado na ciki da na waje ganuwar, benaye, dakunan wanka, kitchens, da dai sauransu. Ita ce mafi yawan amfani da tayal. Abun ɗaurewa.
Yawancin lokaci, idan muka yi la'akari da aikin abin ɗamara na tayal, ya kamata mu mai da hankali ga ƙarfin injinsa da lokacin buɗewa baya ga aikin sa da ikon hana zamewa. Bugu da ƙari, yana rinjayar rheological Properties na roba roba, irin su santsi na aiki, yanayin wuka mai danko, da dai sauransu, ether cellulose yana da tasiri mai karfi akan kayan aikin injiniya na tayal.
1. Lokacin budewa
YausheRedispersible polymer fodakumacellulose etherzama tare a cikin rigar turmi, wasu samfuran bayanai sun nuna cewa foda na roba yana da ƙarfin kuzarin motsa jiki da ke haɗe zuwa samfurin hydration na siminti, kuma ether cellulose ya fi kasancewa a cikin ruwa mai tsaka-tsaki, wanda ke shafar ƙari. Dankowa da lokacin saita turmi. Tashin hankali na ether na cellulose ya fi girma fiye da na foda na roba, kuma wadatar da ƙarin ether cellulose a turmi yana da amfani don samar da haɗin gwiwar hydrogen tsakanin tushen tushe da ether cellulose.
A cikin rigar turmi, ruwan da ke cikin turmi yana ƙafe, ana wadatar da ether cellulose a saman, kuma an samar da fim a saman turmi a cikin minti 5, wanda ya rage yawan fitar da ruwa na gaba, kamar yadda ruwa ya fi girma daga turmi. Wani ɓangare na ƙaura zuwa ƙananan Layer na turmi Layer, farkon buɗewar membrane ya narkar da wani bangare, kuma ƙaurawar ruwa zai kawo ƙarin ether cellulose zuwa saman turmi.
Samuwar fim din cellulose ether a saman turmi yana da tasiri mai girma akan aikin turmi:
Na farko, fim ɗin da aka kafa yana da bakin ciki sosai, za a narkar da shi sau biyu, ba zai iya iyakance ƙawancen ruwa ba, rage ƙarfin.
Na biyu, fim ɗin da aka kafa yana da kauri sosai, ƙaddamar da ether na cellulose a cikin turmi interstitial ruwa yana da girma, kuma danko yana da girma. Lokacin da aka liƙa tayal, ba shi da sauƙi don karya fim ɗin saman.
Daga wannan, an fahimci cewa fina-finai na fim na ether cellulose suna da tasiri mai yawa akan lokacin budewa. Nau'in cellulose ether (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 ether cellulose, da taurin da taurin fim ɗin.
2.karfi
Baya ga ba da kaddarorin masu fa'ida iri-iri da aka kwatanta a sama zuwa turmi, ether cellulose yana jinkirta aikin motsa jiki na siminti. Wannan jinkirin ya samo asali ne saboda adsorption na ƙwayoyin ether na cellulose akan nau'o'in ma'adinai daban-daban a cikin tsarin siminti mai ruwa, amma gabaɗaya magana, ƙwayoyin ether na cellulose sun fi shafa akan ruwa kamar CSH da calcium hydroxide. A kan samfurin sinadarai, ba a cika yin saƙo a kan ainihin lokacin ma'adinai na clinker ba. Bugu da ƙari, saboda haɓakar danko na bayani na pore, ether cellulose yana rage motsi na ions (Ca2 +, SO42-, ...) a cikin maganin pore, don haka ya kara jinkirta tsarin hydration.
Danko wani muhimmin siga ne wanda ke wakiltar sinadarai na ethers 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, binciken gwaji ya gano cewa danko na ether cellulose ba shi da wani tasiri a kan hydration kinetics na siminti. Nauyin kwayoyin yana da ɗan tasiri akan hydration, kuma babban bambanci tsakanin ma'aunin kwayoyin halitta daban-daban shine kawai 10 min. Saboda haka, nauyin kwayoyin ba shine mahimmin ma'auni don sarrafa ruwan siminti ba.
"Aikace-aikacen ether na Cellulose a cikin Samfuran Busassun Haɗaɗɗen Turmi Na Siminti" ya bayyana a sarari cewa jinkirin ether cellulose ya dogara da tsarin sinadarai. Babban yanayin da aka taƙaita shi ne cewa ga MHEC, mafi girman matakin methylation, ƙarami na jinkirtar ether cellulose. Bugu da ƙari, maye gurbin hydrophilic (irin su maye gurbin HEC) sun fi damuwa fiye da maye gurbin hydrophobic (kamar maye gurbin zuwa MH, MHEC, MHPC). Sakamakon retarding na ether cellulose ya fi shafar sigogi biyu na nau'i da adadin adadin madadin.
Gwaje-gwajen tsarin mu kuma sun gano cewa abun ciki na masu maye gurbin suna taka muhimmiyar rawa a cikin ƙarfin injin na manne tayal. Mun kimanta aikin HPMC tare da digiri daban-daban na maye gurbin a cikin mannen tayal, kuma mun gwada nau'ikan ether cellulose tare da ƙungiyoyi daban-daban a ƙarƙashin yanayi daban-daban. Tasirin kayan aikin injiniya na mannen tayal, Hoto 2 da Hoto 3 sune tasirin canje-canje a cikin abun ciki na methoxy (DS) da abun ciki na hydroxypropoxy (MS) akan ƙarfin cirewa na manne tayal a zafin jiki.
Hoto 2
Hoto 3
A cikin gwajin, mun yi la'akariHydroxypropyl methyl cellulose (HPMC), wanda shine hadadden ether. Saboda haka, ya kamata mu hada wadannan adadi guda biyu. Don HPMC, muna buƙatar wadata don tabbatar da solubility na ruwa da watsa haske. Mun san abin da ke cikin maye gurbin. Hakanan yana ƙayyade zafin gel na HPMC, wanda ke ƙayyade yanayin da ake amfani da HPMC. Don haka, an tsara abun ciki na HPMC da aka saba amfani da shi a cikin kewayon. Yadda ake haɗa ƙungiyoyin methoxy da hydroxypropoxy a cikin wannan kewayon Don cimma kyakkyawan sakamako shine abin da muke nazarin. Hoto na 2 yana nuna cewa a cikin wani yanki na musamman, haɓakar abun ciki na methoxyl zai haifar da yanayin ƙasa na ƙarfin ja, yayin da abun ciki na hydroxypropoxyl zai karu kuma ƙarfin ja zai karu. Don lokacin buɗewa, akwai tasiri iri ɗaya.
Lokacin aikawa: Dec-18-2018