Mafi girma da danko nahydroxypropyl methylcellulose, mafi kyawun aikin riƙe ruwa. Danko shine muhimmin siga na aikin HPMC. A halin yanzu, masana'antun HPMC daban-daban suna amfani da hanyoyi da kayan aiki daban-daban don auna danko na HPMC. Babban hanyoyin sune Haake Rotovisko, Hoppler, Ubbelohde da Brookfield.
Don samfurin iri ɗaya, sakamakon danko da aka auna ta hanyoyi daban-daban sun bambanta sosai, wasu ma ma sun ninka bambanci. Don haka, lokacin kwatanta danko, tabbatar da yin shi tsakanin hanyoyin gwaji iri ɗaya, gami da zafin jiki, rotor, da sauransu.
Don girman barbashi, mafi kyawun barbashi, mafi kyawun riƙewar ruwa. Bayan manyan barbashi na ether cellulose sun shiga cikin ruwa, saman ya narke nan da nan don samar da gel, wanda ke nannade kayan don hana ci gaba da shigar da kwayoyin ruwa. . Yana da matukar tasiri tasirin riƙewar ruwa na ether cellulose, kuma solubility yana ɗaya daga cikin abubuwan da za a zabi ether cellulose. Fineness kuma muhimmin ma'aunin aiki ne na methyl cellulose ether. Ana buƙatar MC da aka yi amfani da shi don busassun busassun turmi don zama foda, tare da ƙananan abun ciki na ruwa, kuma fineness kuma yana buƙatar 20% zuwa 60% na girman barbashi ya zama ƙasa da 63um. Fineness yana rinjayar solubility na hydroxypropyl methylcellulose ether. Mc mai laushi yawanci granular ne, kuma yana da sauƙi a narke cikin ruwa ba tare da haɓaka ba, amma yawan narkewa yana da hankali sosai, don haka bai dace da amfani da busassun turmi ba. A cikin busassun turmi, MC yana tarwatse a cikin kayan siminti kamar su aggregates, filaye masu kyau da siminti. Kyakkyawan isasshen foda kawai zai iya guje wa agglomeration na methyl cellulose ether lokacin haɗuwa da ruwa. Lokacin da aka ƙara MC da ruwa don narkar da agglomerates, yana da wuya a tarwatsawa da narke. MC tare da m fineness ba kawai ɓatacce ba, amma kuma yana rage ƙarfin gida na turmi. Lokacin da aka gina irin wannan busasshiyar turmi a cikin wani babban yanki, saurin warkar da busasshen busassun busassun gida yana raguwa sosai, kuma fashewa yana faruwa saboda lokutan warkewa daban-daban. Don turmi mai fesa ta amfani da ginin injiniya, saboda ɗan gajeren lokacin motsawa, ana buƙatar fineness ya zama mafi girma.
Gabaɗaya magana, mafi girman danko, mafi kyawun tasirin riƙewar ruwa. Duk da haka, mafi girman danko kuma mafi girman nauyin kwayoyin halitta na MC, raguwa mai dacewa a cikin solubility, wanda yana da mummunan tasiri akan ƙarfin da kayan gini na turmi. Mafi girman danko, mafi bayyane tasirin tasirin turmi, amma ba daidai ba ne. Mafi girman danko, da ƙarin m turmi zai kasance. A lokacin ginawa, zai tsaya ga scraper kuma yana da babban mannewa ga substrate. Amma bai yi kadan ba don ƙara ƙarfin tsarin jika ɗin da kansa. A lokacin gini, aikin anti-sagging ba a bayyane yake ba. Akasin haka, wasu ƙananan danko amma gyare-gyare na methyl cellulose ethers suna da kyakkyawan aiki wajen inganta ƙarfin tsarin jika.
Mafi girman adadin ether cellulose da aka ƙara a cikin turmi, mafi kyawun aikin riƙewar ruwa, mafi girman danko, mafi kyawun aikin riƙewar ruwa.
Har ila yau, ingancin HPMC yana da wani tasiri a kan riƙewar ruwa. Gabaɗaya magana, ga methyl cellulose ethers tare da danko iri ɗaya amma daban-daban fineness, a cikin yanayin adadin adadin wannan ƙari, mafi kyawun inganci, mafi kyawun tasirin riƙewar ruwa.
Riƙewar ruwa na HPMC kuma yana da alaƙa da yanayin zafin da ake amfani da shi, kuma riƙewar ruwa na methyl cellulose ether yana raguwa tare da haɓakar zafin jiki. Duk da haka, a aikace-aikace na kayan aiki, busassun busassun turmi ana amfani da su sau da yawa a kan zafi mai zafi (mafi girma fiye da digiri 40) a wurare da yawa, irin su bangon bangon bango na waje a ƙarƙashin rana a lokacin rani, wanda sau da yawa yana hanzarta Curing na siminti da taurin busasshen turmi. Ragewar riƙewar ruwa ya haifar da fahimtar fahimtar cewa duka iyawar aiki da tsattsauran ra'ayi sun shafi, kuma yana da mahimmanci musamman don rage tasirin yanayin zafi a ƙarƙashin irin waɗannan yanayi. Kodayake methyl hydroxyethyl cellulose ether additive a halin yanzu ana ɗaukarsa a matsayin kan gaba wajen haɓakar fasaha, dogaro da zafin jiki na iya haifar da raunin busasshen aikin turmi. Ko da yake adadin methyl hydroxyethyl cellulose (tsarin lokacin rani) ya karu, ƙarfin aiki da juriya har yanzu ba zai iya biyan bukatun amfani ba. Ta hanyar wasu jiyya na musamman, kamar haɓaka matakin etherification, MC na iya ci gaba da riƙe tasirin ruwan sa mafi kyau a yanayin zafi mai girma, ta yadda zai iya samar da mafi kyawun aiki a ƙarƙashin yanayi mara kyau.
Lokacin aikawa: Oktoba-20-2022