1 Gabatarwa
Manna tayal mai tushen siminti a halin yanzu shine mafi girman amfani da turmi na musamman da aka haɗa da busasshe, wanda aka haɗa da siminti a matsayin babban kayan siminti kuma ana ƙara shi da kayan haɗin da aka tsara, abubuwan riƙe ruwa, abubuwan ƙarfafawa na farko, foda latex da sauran haɗin sinadarai na halitta ko na halitta. Gabaɗaya, yana buƙatar a haɗa shi da ruwa kawai lokacin amfani. Idan aka kwatanta da turmi na siminti na yau da kullun, yana iya inganta ƙarfin haɗin tsakanin kayan da ke fuskantar da substrate, kuma yana da juriya mai kyau na zamewa da juriya mai kyau ga ruwa da ruwa. Ana amfani da shi galibi don manna kayan ado kamar tayal na ciki da na waje na gini, tayal na ƙasa, da sauransu. Ana amfani da shi sosai a bango na ciki da na waje, benaye, bandakuna, kicin da sauran wuraren ado na gini. A halin yanzu shine kayan haɗin tayal da aka fi amfani da su.
Yawanci idan muka yi la'akari da aikin manne na tayal, ba wai kawai muna mai da hankali kan aikin sa da kuma ikon hana zamewa ba, har ma muna mai da hankali kan ƙarfin injin sa da lokacin buɗewa. Cellulose ether a cikin manne na tayal ba wai kawai yana shafar halayen rheological na manne na porcelain ba, kamar aiki mai santsi, wuka mai mannewa, da sauransu, har ma yana da tasiri mai ƙarfi akan halayen injin na manne na tayal.
2. Tasirin da ke kan lokacin buɗewar manne na tayal
Idan foda na roba da cellulose ether suka haɗu a cikin turmi mai laushi, wasu samfuran bayanai sun nuna cewa foda na roba yana da ƙarfin kuzarin motsi don haɗawa da samfuran ruwa na siminti, kuma cellulose ether yana wanzuwa a cikin ruwan interstitial, wanda ke shafar ƙarin danko na turmi da lokacin saitawa. Tashin hankali na saman cellulose ether ya fi na foda na roba girma, kuma ƙarin wadatar cellulose ether akan mahaɗin turmi zai zama da amfani ga samuwar haɗin hydrogen tsakanin saman tushe da cellulose ether.
A cikin turmi mai danshi, ruwan da ke cikin turmi yana ƙafewa, kuma za a wadatar da cellulose ether a saman, kuma za a samar da fim a saman turmi cikin mintuna 5, wanda zai rage yawan ƙafewar da ke biyo baya, yayin da ake cire ƙarin ruwa daga turmi mai kauri. Wani ɓangare na shi yana ƙaura zuwa layin turmi mai sirara, kuma fim ɗin da aka samar a farkon yana narkewa kaɗan, kuma ƙaurar ruwa zai kawo ƙarin wadatar cellulose ether a saman turmi.
Saboda haka, samuwar fim ɗin cellulose ether a saman turmi yana da babban tasiri ga aikin turmi. 1) Fim ɗin da aka samar ya yi siriri sosai kuma za a narkar da shi sau biyu, wanda ba zai iya iyakance fitar da ruwa da rage ƙarfi ba. 2) Fim ɗin da aka samar ya yi kauri sosai, yawan cellulose ether a cikin ruwan interstitial na turmi yana da yawa, kuma ɗanko yana da yawa, don haka ba abu ne mai sauƙi a karya fim ɗin saman ba lokacin da aka manna tayal ɗin. Ana iya ganin cewa halayen samar da fim na cellulose ether suna da tasiri mafi girma akan lokacin buɗewa. Nau'in cellulose ether (HPMC, HEMC, MC, da sauransu) da matakin etherification (digiri na maye gurbin) kai tsaye suna shafar halayen samar da fim na cellulose ether, da kuma taurin da taurin fim ɗin.
3. Tasirin ƙarfin zane
Baya ga samar da kaddarorin amfani ga turmi, cellulose ether kuma yana jinkirta motsin ruwa na siminti. Wannan tasirin rage ruwa ya samo asali ne daga shaƙar ƙwayoyin cellulose ether a matakai daban-daban na ma'adanai a cikin tsarin siminti da ake shaƙar ruwa, amma gabaɗaya, an yarda cewa ƙwayoyin cellulose ether galibi suna shaƙar ruwa kamar CSH da calcium hydroxide. Dangane da samfuran sinadarai, ba kasafai ake shaƙar su a matakin ma'adinai na asali na clinker ba. Bugu da ƙari, cellulose ether yana rage motsi na ions (Ca2+, SO42-, ...) a cikin maganin rami saboda ƙaruwar danko na maganin rami, ta haka yana ƙara jinkirta tsarin shaƙar ruwa.
Danko wani muhimmin siga ne, wanda ke wakiltar halayen sinadarai na cellulose ether. Kamar yadda aka ambata a sama, danko yana shafar ƙarfin riƙe ruwa kuma yana da tasiri mai mahimmanci akan iya aiki na turmi sabo. Duk da haka, binciken gwaji ya gano cewa danko na cellulose ether ba shi da tasiri kusan akan motsin haƙar siminti. Nauyin kwayoyin halitta ba shi da tasiri sosai akan ruwa, kuma babban bambanci tsakanin nau'ikan kwayoyin halitta daban-daban shine minti 10 kawai. Saboda haka, nauyin kwayoyin halitta ba shine mabuɗin siga don sarrafa ruwan siminti ba.
Jinkirin cellulose ether ya dogara ne akan tsarin sinadaransa, kuma yanayin gabaɗaya ya kammala da cewa, ga MHEC, mafi girman matakin methylation, ƙarancin tasirin cellulose ether. Bugu da ƙari, tasirin jinkirin maye gurbin hydrophilic (kamar maye gurbin HEC) ya fi ƙarfi fiye da na maye gurbin hydrophobic (kamar maye gurbin MH, MHEC, MHPC). Tasirin jinkirin cellulose ether galibi yana shafar sigogi biyu, nau'in da adadin ƙungiyoyin maye gurbin.
Gwaje-gwajenmu na tsari sun kuma gano cewa abubuwan da ke cikin abubuwan maye suna taka muhimmiyar rawa a cikin ƙarfin injinan manne tayal. Mun kimanta aikin HPMC tare da matakai daban-daban na maye gurbin manne tayal, kuma mun gwada tasirin ethers cellulose waɗanda ke ɗauke da ƙungiyoyi daban-daban a ƙarƙashin yanayi daban-daban na warkarwa akan Tasirin akan halayen injinan manne tayal.
A cikin gwajin, mun yi la'akari da HPMC, wanda shine mahaɗin ether, don haka dole ne mu haɗa hotunan biyu. Ga HPMC, yana buƙatar wani matakin sha don tabbatar da narkewar ruwa da kuma watsa haske. Mun san abubuwan da ke cikin maye Hakanan yana ƙayyade zafin gel na HPMC, wanda kuma yana ƙayyade yanayin amfani da HPMC. Ta wannan hanyar, ana kuma tsara abubuwan da ke cikin rukunin HPMC wanda yawanci ya dace a cikin kewayon. A cikin wannan kewayon, yadda ake haɗa methoxy da hydroxypropoxy Domin cimma mafi kyawun sakamako shine abubuwan da ke cikin bincikenmu. Hoto na 2 ya nuna cewa a cikin wani takamaiman kewayon, ƙaruwa a cikin abubuwan da ke cikin ƙungiyoyin methoxyl zai haifar da raguwar ƙarfin fitarwa, yayin da ƙaruwa a cikin abubuwan da ke cikin ƙungiyoyin hydroxypropoxyl zai haifar da ƙaruwa a cikin ƙarfin fitarwa. Akwai irin wannan tasirin ga lokutan buɗewa.
Sauyin yanayin ƙarfin injina a lokacin buɗewa ya yi daidai da yanayin zafin jiki na yau da kullun. HPMC mai yawan methoxyl (DS) da ƙarancin hydroxypropoxyl (MS) yana da kyakkyawan tauri na fim ɗin, amma zai shafi danshi a akasin haka.
Lokacin Saƙo: Janairu-09-2023