Mafi girman danko na hydroxypropyl methylcellulose, mafi kyawun aikin riƙe ruwa. Danko shine muhimmin siga don 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 ya bambanta sosai, wasu kuma sun bambanta. Sabili da haka, lokacin kwatanta danko, tabbatar da yin shi tsakanin hanyoyin gwaji iri ɗaya, gami da zafin jiki, sandal, da sauransu.
Game da girman barbashi, mafi kyawun barbashi, mafi kyawun riƙewar ruwa. Lokacin da manyan barbashi na cellulose ether suka shiga cikin ruwa, nan da nan saman ya narke don samar da gel, wanda ke kunshe da kayan kuma yana hana ci gaba da shiga cikin kwayoyin ruwa. . Ya fi rinjaye tasirin riƙewar ruwa na ether cellulose, kuma solubility yana ɗaya daga cikin abubuwan da ke zaɓar ether cellulose. Fineness kuma muhimmin alamar aiki ne na methylcellulose ether. Ana buƙatar MC da aka yi amfani da shi a cikin busassun turmi don zama foda, tare da ƙananan abun ciki na danshi, 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 ƙanƙara yawanci granular ne kuma yana iya narkewa cikin sauƙi a cikin ruwa ba tare da yin burodi ba, amma adadin narkarwar yana da sannu a hankali, don haka bai dace da amfani da busasshiyar turmi ba. A busasshen turmi, MC yana tarwatse a cikin kayan siminti kamar su tara, filler mai kyau da siminti. Foda kawai da ke da kyau za su hana methylcellulose ether daga clumping lokacin da aka haxa shi da ruwa. Lokacin da MC ya ƙara ruwa don narkar da aggregates, da wuya a tarwatsa da narke. MC tare da m fineness ba kawai haifar da sharar gida ba, amma kuma yana rage ƙarfin gida na turmi. Lokacin da aka gina irin wannan busasshen turmi a kan wani yanki mai girma, saurin warkar da busasshen turmi na gida yana raguwa sosai, kuma yana faruwa ne saboda lokuta daban-daban na warkewa. Don fesa turmi ta amfani da ginin injina, ana buƙatar mafi girman fineness saboda guntun lokacin haɗuwa.
Gabaɗaya magana, mafi girman danko, mafi kyawun tasirin riƙewar ruwa. Koyaya, mafi girman danko da nauyin kwayoyin halitta na MC, daidaitaccen raguwa a cikin solubility, wanda ke da mummunan tasiri akan ƙarfin da aikin ginin turmi. Mafi girman danko, mafi bayyane tasirin tasirin turmi, amma ba daidai ba ne. Mafi girma danko, da manne da rigar turmi. Zai manne wa scraper a lokacin ginawa kuma yana da babban mannewa ga substrate. Amma bai yi kadan ba don ƙara ƙarfin tsarin jika ɗin da kansa. A lokacin aikin ginin, aikin anti-sag bai fito fili ba. Sabanin haka, wasu ƙananan danko amma gyare-gyare na methylcellulose ethers suna da kyawawan kaddarorin inganta ƙarfin tsarin jika.
Mafi girman adadin ether cellulose da aka ƙara a cikin turmi, mafi kyawun aikin riƙewar ruwa, kuma mafi girman danko, mafi kyawun aikin riƙewar ruwa.
Har ila yau, tarar HPMC tana da wani tasiri a kan riƙewar ruwa. Gabaɗaya magana, don methyl cellulose ethers tare da danko iri ɗaya amma daban-daban fineness, lokacin da adadin adadin ya kasance iri ɗaya, mafi kyawun inganci, mafi kyawun tasirin riƙewar ruwa.
Riƙewar ruwa na HPMC shima yana da alaƙa da zafin amfani. Riƙewar ruwa na methylcellulose ether yana raguwa yayin da yawan zafin jiki ya karu. Koyaya, a cikin aikace-aikacen kayan aiki na zahiri, busassun turmi galibi ana gina su akan abubuwan zafi mai zafi tare da yanayin zafi sama da digiri 40 a cikin mahalli da yawa, irin su plastering a bangon waje a ƙarƙashin rana ta rani, wanda sau da yawa yana haɓaka haɓakar ciminti da canza launi. siminti. taurare. Bushewar turmi. Ragewar riƙewar ruwa ya bayyana a fili cewa aikin aiki da tsattsauran ra'ayi zai shafi, kuma yana da mahimmanci musamman don rage tasirin abubuwan zafin jiki a ƙarƙashin irin waɗannan yanayi. Ko da yake methylhydroxyethylcellulose ether additives a halin yanzu ana la'akari da su a sahun gaba wajen ci gaban fasaha, dogaro da zafin jiki na iya haifar da rauni na busassun kayan turmi. Ko da yake an ƙara yawan adadin methylhydroxyethylcellulose (Xia dabarar), tsarin aiki da juriya har yanzu ba zai iya biyan bukatun amfani ba. Ta hanyar wasu jiyya na musamman, irin su haɓaka matakin etherification, da dai sauransu, MC na iya kula da mafi kyawun riƙewar ruwa a yanayin zafi mafi girma, don haka samar da mafi kyawun aiki a ƙarƙashin yanayi mara kyau.
Lokacin aikawa: Fabrairu-06-2024