A cikin amfani dahydroxypropyl methyl cellulose HPMC, yawanci mukan ga cewa an kasu kashi biyu: nan take da kuma jinkirin rushewa. Bari mu fahimci bambanci tsakanin saurin rushewa da jinkirin rushewar hydroxypropyl methyl cellulose.
Instant HPMC yana nufin yin amfani da giciye-linking wakili ga surface jiyya a cikin samar da tsari, sabõda haka, HPMC za a iya da sauri tarwatsa a cikin ruwan sanyi, amma ba a hakikanin bayani, ta hanyar uniform stirring, danko sannu a hankali tashi, wato, rushe;
Slow soluble HPMC kuma ana iya kiransa samfuran narke mai zafi. Lokacin da aka sami ruwan sanyi, ana iya tarwatsa shi da sauri cikin ruwan zafi. Ta hanyar motsawa a ko'ina, zafin jiki na maganin zai ragu zuwa wani zazzabi. (Zazzabi na gel ɗin mu yana kusan 60 ° C), danko zai bayyana a hankali har sai an sami gel mai haske da mai ɗaci.
Anan akwai bambanci tsakanin mafita nan da nan da kuma jinkirin mafita. Idan kuna da wasu tambayoyi game da wannan ilimin, kuna iya tuntuɓar mu.
Hydroxypropyl methyl celluloseHPMCjinkirta ciminti ruwa
Ƙara hydroxypropyl methyl cellulose zuwa siminti yana rage yawan ruwa. To me kuka sani game da yadda yake aiki? Bari mu dubi hydroxypropyl methyl cellulose don jinkirta ciminti hydration. Ka'ida.
1. Ion motsi cuta hasashe
Mun yi hasashe cewa hydroxypropyl methyl cellulose zai ƙara danko na pore mafita, hana adadin ionic motsi, da jinkirta hydration na siminti. Duk da haka, ƙananan danko ethers cellulose a cikin wannan gwajin yana da ƙarfi mai ƙarfi don jinkirta ciminti hydration. Saboda haka, wannan zato ba shi da inganci. Pourchez et al. kuma suna shakkar wannan hasashe. A gaskiya ma, lokacin ƙaura ko ƙaura yana da ɗan gajeren lokaci, a fili ba ya bambanta da jinkirin jinkirin siminti.
2. Lalacewar alkaline
Polysaccharides yana raguwa da sauri a ƙarƙashin yanayin alkaline don samar da acid hydroxyl carboxylic acid wanda ke jinkirta hydration na siminti. Saboda haka, jinkirin jinkirin hydroxypropyl methyl cellulose na iya zama saboda lalacewa a cikin slurries simintin alkaline don samar da acid hydroxycarboxylic. Koyaya, Pourchez et al. gano cewa ethers cellulose sun kasance masu karko a ƙarƙashin yanayin alkaline, sun ƙasƙanta kawai dan kadan, kuma samfurori na lalata ba su da tasiri a kan jinkirta ciminti hydration.
3, adsorption
Adsorption na iya zama hydroxypropyl methyl cellulose block ciminti hydration ainihin dalilin shi ne cewa da yawa Organic Additives za a adsorbed a kan siminti barbashi da hydration kayayyakin, hana rushewar siminti barbashi da crystallization na hydration kayayyakin, don jinkirta da hydration da condensation na siminti. Pourchez et al. An gano cewa ethers cellulose suna daɗaɗawa a kan saman samfuran hydration irin su calcium hydroxide, CSH gel da calcium aluminate hydrate, amma ba a sauƙaƙe ta hanyar ettringite da matakan rashin ruwa ba. Bugu da ƙari, a cikin yanayin cellulose ether, ƙarfin adsorption na HEC ya fi karfi fiye da kumburi MC. Ƙananan abun ciki na hydroxyethyl a cikin HEC ko hydroxypropyl aHPMC, Ƙarfin ƙarfin adsorption: dangane da samfuran hydration, ƙarfin tallan calcium hydroxide ya fi ƙarfin CSH. Bugu da ari bincike kuma ya nuna cewa adsorption iya aiki na hydration kayayyakin da cellulose ether yana da alaka da jinkiri na ciminti hydration: da karfi da adsorption, da mafi fili da jinkiri, amma ettringite adsorption na cellulose ether ne mai rauni, amma samuwar, amma wannan yana da muhimmanci jinkiri. cellulose ether na tricalcium silicate da hydration kayayyakin yana da karfi adsorption, shi a fili jinkirta da hydration tsari na silicate lokaci, da adsorption adadin ettringite ne sosai low, amma jinkirta ettringite samuwar a bayyane yake, saboda jinkirta ettringite samuwar ya shafi Ca 2 + balance a cikin bayani, shi ne wani tsawo na cellulose. Late silicate hydration ya ci gaba.
Waɗannan su ne hydroxypropyl methyl cellulose jinkirta ciminti hydration ka'idar. Muna fatan wannan ilimin zai ba kowa damar fahimtar yadda samfurin ke aiki da kuma amfani da shi mafi kyau.
Lokacin aikawa: Afrilu-26-2024