Bayani: ana magana da shi azaman HPMC, fari ko fari-farin fibrous ko granular foda. Akwai nau'ikan cellulose da yawa kuma ana amfani da su sosai, amma galibi muna tuntuɓar abokan ciniki a cikin masana'antar ginin busasshen foda. Mafi na kowa cellulose yana nufin hypromellose.
Production tsari: Babban albarkatun kasa na HPMC: mai ladabi auduga, methyl chloride, propylene oxide, sauran albarkatun kasa sun hada da flake alkali, acid, toluene, isopropanol, da dai sauransu Bi da mai ladabi auduga cellulose da Alkali bayani a 35-40 ℃ na rabin wani sa'a, danna, juye da cellulose, da kuma yadda ya dace da shekaru a 35 ℃, don haka matsakaicin digiri na polymerization na samu. fiber alkali yana cikin kewayon da ake buƙata. Saka alkali zaruruwa a cikin kettle etherification, ƙara propylene oxide da methyl chloride bi da bi, da etherify a 50-80 °C na 5 hours, tare da matsakaicin matsa lamba na 1.8 MPa. Sa'an nan kuma ƙara yawan adadin hydrochloric acid da oxalic acid zuwa ruwan zafi a 90 ° C don wanke kayan don fadada ƙarar. Dehydrate tare da centrifuge. A wanke har sai tsaka tsaki, kuma lokacin da danshi a cikin kayan ya kasance ƙasa da 60%, bushe shi tare da iska mai zafi a 130 ° C zuwa ƙasa da 5%. Aiki: riƙe ruwa, thickening, thixotropic anti-sag, iska-enraining workability, retarding saitin.
Riƙewar ruwa: Riƙewar ruwa shine mafi mahimmancin dukiya na ether cellulose! A cikin samar da turmi gypsum putty da sauran kayan aiki, aikace-aikacen ether cellulose yana da mahimmanci. Babban riƙewar ruwa zai iya amsawa gabaɗaya ash siminti da alli gypsum (mafi yawan amsawar, ƙarfin ƙarfin). A karkashin yanayi guda, mafi girman danko na ether cellulose, mafi kyawun riƙewar ruwa (rabin da ke sama da 100,000 danko yana raguwa); mafi girman sashi, mafi kyawun riƙewar ruwa, yawanci ƙaramin adadin ether na cellulose zai iya inganta aikin turmi sosai. Adadin riƙewar ruwa, lokacin da abun ciki ya kai wani matakin, yanayin haɓaka yawan riƙe ruwa ya zama mai hankali; yawan riƙewar ruwa na ether cellulose yawanci yana raguwa lokacin da yanayin zafi ya karu, amma wasu ethers cellulose mai girma-gel kuma suna da kyakkyawan aiki a ƙarƙashin yanayin zafi mai zafi. Riƙewar ruwa. Matsalolin da ke tsakanin kwayoyin ruwa da sarƙoƙi na cellulose ether suna ba da damar kwayoyin ruwa su shiga cikin ciki na cellulose ether macromolecular chains kuma su sami karfi mai ɗauri, ta yadda za su samar da ruwa kyauta, ruwa mai raɗaɗi, da kuma inganta ruwa na ciminti slurry.
Kauri, thixotropic da anti-sag: yana ba da kyakkyawan danko ga rigar turmi! Yana iya ƙara mannewa sosai tsakanin jika turmi da tushe Layer, da kuma inganta anti-sagging yi na turmi. A thickening sakamako na cellulose ethers kuma yana ƙara watsawa juriya da kuma homogeneity na freshly gauraye kayan, hana abu delamination, segregation da zub da jini. Sakamakon thickening na cellulose ethers a kan siminti-tushen kayan zo daga danko na cellulose ether mafita. A karkashin irin wannan yanayi, mafi girman danko na ether cellulose, mafi kyawun danko na kayan da aka gyara na siminti, amma idan danko ya yi girma sosai, zai shafi ruwa da aiki na kayan (kamar maɗaukaki mai laushi da tsari). scraper). aiki). Turmi mai daidaita kai da kankare da kanka wanda ke buƙatar babban ruwa yana buƙatar ƙarancin ɗankowar ether cellulose. Bugu da ƙari, tasirin daɗaɗɗen ether na cellulose zai ƙara yawan buƙatar ruwa na kayan da aka gina da siminti da kuma ƙara yawan yawan turmi. High danko cellulose ether ruwa bayani yana da high thixotropy, wanda kuma shi ne babban hali na cellulose ether. Maganin ruwa mai ruwa na cellulose gabaɗaya suna da pseudoplastic, kaddarorin kwararar da ba na thixotropic a ƙasa da zafin gel ɗin su, amma kaddarorin kwararar Newtonian a ƙananan ƙimar ƙarfi. Pseudoplasticity yana ƙaruwa tare da haɓaka nauyin kwayoyin halitta ko ƙaddamar da ether cellulose. An kafa gels na tsarin lokacin da zafin jiki ya karu, kuma babban hawan thixotropic yana faruwa. Cellulose ethers tare da babban taro da ƙananan danko suna nuna thixotropy ko da ƙasa da zafin jiki na gel. Wannan kadarar tana da fa'ida sosai ga ginin turmi don daidaita daidaito da sag. Ya kamata a lura a nan cewa mafi girma da danko na cellulose ether, da mafi alhẽri da ruwa riƙewa, amma mafi girma da danko, mafi girma da zumunta kwayoyin nauyi na cellulose ether, da m ragewa a cikin solubility, wanda yana da korau. tasiri akan ƙaddamarwar turmi da aiki.
Dalili: Cellulose ether yana da tabbataccen tasiri na motsa iska akan sabbin kayan tushen siminti. Cellulose ether yana da duka rukuni na hydrophilic (ƙungiyar hydroxyl, ƙungiyar ether) da ƙungiyar hydrophobic (rukunin methyl, zobe na glucose), shine surfactant, yana da aiki na sama, don haka yana da tasirin iska. Hanyoyin haɓakar iska na ether cellulose zai haifar da sakamako na "ball", wanda zai iya inganta aikin aiki na kayan da aka haɗa da sabo, irin su ƙara filastik da santsi na turmi a lokacin aiki, wanda ke da amfani ga shimfidar turmi. ; zai kuma kara yawan fitowar turmi. , rage farashin samar da turmi; amma zai ƙara porosity na kayan da aka taurare kuma ya rage kayan aikin injinsa kamar ƙarfi da na roba. A matsayinsa na surfactant, cellulose ether shima yana da tasirin jika ko mai a jikin siminti, wanda tare da isar da iskar sa yana kara yawan ruwan kayan da ke da siminti, amma tasirinsa na kauri zai rage yawan ruwa. Tasirin kwarara shine hadewar filastik da tasirin tasiri. Lokacin da abun ciki na ether cellulose ya yi ƙasa sosai, an fi bayyana shi azaman filastik ko tasirin rage ruwa; lokacin da abun ciki ya yi girma, tasirin tasirin ether cellulose yana ƙaruwa da sauri, kuma tasirin sa na iska yana kula da zama cikakke, don haka aikin yana ƙaruwa. Tasiri mai kauri ko ƙara yawan buƙatar ruwa.
Saita jinkiri: Cellulose ether na iya jinkirta tsarin hydration na siminti. Ethers cellulose suna ba da turmi tare da kaddarorin amfani daban-daban, sannan kuma yana rage saurin sakin simintin zafi na farko da kuma jinkirta aiwatar da aikin motsa jiki na siminti. Wannan bai dace ba don amfani da turmi a cikin yankuna masu sanyi. Wannan jinkirin yana faruwa ne ta hanyar tallan ƙwayoyin ether cellulose akan samfuran ruwa kamar CSH da ca (OH)2. Saboda karuwa a cikin danko na bayani na pore, ether cellulose yana rage motsi na ions a cikin maganin, ta haka yana jinkirta tsarin hydration. Mafi girman ƙaddamar da ether cellulose a cikin kayan gel na ma'adinai, mafi mahimmancin tasirin jinkirin hydration. Cellulose ethers ba kawai jinkirta saitin ba, amma kuma yana jinkirta tsarin taurin tsarin siminti. Sakamakon retardation na cellulose ether ya dogara ba kawai a kan maida hankali a cikin tsarin gel ma'adinai ba, har ma a kan tsarin sinadaran. Matsayi mafi girma na methylation na HEMC, mafi kyawun sakamako na retardation na ether cellulose. Sakamakon jinkirta ya fi karfi. Duk da haka, danko na ether cellulose yana da ɗan tasiri a kan hydration motsi na siminti. Tare da haɓaka abun ciki na ether cellulose, lokacin saita turmi yana ƙaruwa sosai. Akwai kyakkyawar alaƙar da ba ta dace ba tsakanin lokacin saitin farko na turmi da abun ciki na ether cellulose, kuma lokacin saitin ƙarshe yana da alaƙa mai kyau tare da abun ciki na ether cellulose. Za mu iya sarrafa lokacin aiki na turmi ta hanyar canza abun ciki na ether cellulose. A cikin samfurin, yana taka rawar riƙe ruwa, kauri, jinkirta ƙarfin siminti, da haɓaka aikin gini. Kyakkyawan riƙewar ruwa yana sa ciminti gypsum ash ash calcium ya amsa gabaɗaya, yana ƙaruwa da ƙarfi sosai, yana haɓaka ƙarfin turmi, kuma a lokaci guda na iya haɓaka ƙarfin ƙarfi da ƙarfi da ƙarfi, haɓaka tasirin gini da ingantaccen aiki. Lokacin daidaitacce. Yana inganta feshi ko famfo na turmi, da kuma ƙarfin tsari. A cikin ainihin aikace-aikacen aikace-aikacen, ya zama dole don ƙayyade nau'in, danko, da adadin cellulose bisa ga samfurori daban-daban, halaye na ginin, da yanayi.
Lokacin aikawa: Nuwamba-15-2022