Sunan HPMC na kasar Sin shine hydroxypropyl methylcellulose. Ba shi da ionic kuma ana amfani da shi sau da yawa azaman maganin riƙe ruwa a cikin turmi mai gauraye. Shi ne kayan da aka fi amfani da su wajen riƙe ruwa a turmi.
Tsarin samar da HPMC galibi samfurin ether ne da aka yi da polysaccharide wanda aka samar ta hanyar alkalization da etherification na zare na auduga (na gida). Ba shi da caji da kansa, baya amsawa da ions ɗin da aka caji a cikin kayan gelling, kuma yana da aiki mai ƙarfi. Farashin kuma ya yi ƙasa da sauran nau'ikan cellulose ethers, don haka ana amfani da shi sosai a cikin turmi mai busasshe.
Aikin hydroxypropyl methylcellulose: Yana iya kauri turmi da aka gauraya sabo don samun ɗanɗano mai laushi da kuma hana rabuwa. (Kauri) Rike ruwa shi ma muhimmin siffa ne, wanda ke taimakawa wajen kiyaye adadin ruwan da ba shi da matsala a cikin turmi, don haka bayan an gina turmi, kayan siminti suna da ƙarin lokaci don yin ruwa. (Rike ruwa) Yana da kaddarorin shiga iska, wanda zai iya gabatar da kumfa mai kyau da iska mai kyau don inganta ginin turmi.
Mafi girman danko na hydroxypropyl methylcellulose ether, haka nan ingancin aikin riƙe ruwa yake. Danko muhimmin ma'auni ne 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. Manyan hanyoyin sune HaakeRotovisko, Hoppler, Ubbelohde da Brookfield.
Ga samfurin iri ɗaya, sakamakon danko da aka auna ta hanyoyi daban-daban ya bambanta sosai, kuma wasu ma suna da bambance-bambance biyu. Saboda haka, lokacin kwatanta danko, dole ne a yi shi tsakanin hanyoyin gwaji iri ɗaya, gami da zafin jiki, rotor, da sauransu. Dangane da girman barbashi, mafi ƙarancin barbashi, mafi kyawun riƙe ruwa. Bayan manyan barbashi na cellulose ether sun haɗu da ruwa, saman zai narke nan da nan ya samar da gel don naɗe kayan don hana ƙwayoyin ruwa ci gaba da shiga. Wani lokaci ba za a iya warwatse shi gaba ɗaya ba ko da bayan an daɗe ana juyawa, yana samar da mafita mai kama da gajimare ko haɗuwa. Yana shafar riƙe ruwa na cellulose ether, kuma narkewa yana ɗaya daga cikin abubuwan da ke haifar da zaɓar cellulose ether.
Fineness kuma muhimmin ma'aunin aiki ne na methyl cellulose ether. Ana buƙatar MC da ake amfani da shi don busasshen turmi ya zama foda, tare da ƙarancin ruwa, kuma fineness ɗin yana buƙatar kashi 20% ~ 60% na girman barbashi ya zama ƙasa da 63um. Fineness ɗin yana shafar narkewar hydroxypropyl methylcellulose ether. MC mai kauri yawanci yana da granular, kuma yana da sauƙin narkewa a cikin ruwa ba tare da haɗuwa ba, amma saurin narkewa yana da jinkiri sosai, don haka bai dace da amfani da shi a cikin busasshen turmi ba.
A cikin busasshen turmi, ana rarraba MC tsakanin kayan siminti kamar su tarawa, filler mai kyau da siminti, kuma foda mai kyau kawai zai iya guje wa tarawa methyl cellulose ether lokacin da ake haɗa shi da ruwa. Lokacin da aka ƙara MC da ruwa don narkar da tarawa, yana da matukar wahala a warwatse da narkewa. Tauraruwar MC ba wai kawai tana ɓatarwa ba ne, har ma tana rage ƙarfin turmi na gida. Lokacin da aka shafa irin wannan turmi busasshen a babban yanki, saurin warkar da turmi busasshen foda na gida zai ragu sosai, kuma tsagewa za su bayyana saboda lokutan warkarwa daban-daban. Ga turmi da aka fesa tare da ginin injiniya, buƙatar tarawa ya fi girma saboda ɗan gajeren lokacin haɗawa. Gabaɗaya, mafi girman tarawa, mafi kyawun tasirin riƙe ruwa. Duk da haka, mafi girman tarawa da kuma girman nauyin kwayoyin halitta na MC, raguwar narkewarsa daidai zai yi mummunan tasiri ga ƙarfi da aikin ginin turmi.
Da yawan danko, haka tasirin kauri a kan turmi yake bayyana, amma ba daidai yake ba. Da yawan danko, haka kuma turmi mai danshi zai yi kauri, wato, a lokacin gini, yana bayyana a matsayin mannewa ga abin gogewa da kuma mannewa mai yawa ga substrate. Amma ba shi da amfani a ƙara ƙarfin tsarin turmi mai danshi da kansa. Wato, a lokacin gini, aikin hana sag ba a bayyane yake ba. Akasin haka, wasu ethers na matsakaici da ƙarancin danko amma waɗanda aka gyara suna da kyakkyawan aiki wajen inganta ƙarfin tsarin turmi mai danshi.
Rikewar ruwa na HPMC yana da alaƙa da zafin da ake amfani da shi, kuma riƙewar ruwa na methyl cellulose ether yana raguwa tare da ƙaruwar zafin jiki. Duk da haka, a aikace-aikacen kayan aiki na gaske, ana amfani da turmi busasshe a kan abubuwan da ke da zafi a yanayin zafi mai yawa (fiye da digiri 40) a wurare da yawa, kamar shafa fenti a bango a ƙarƙashin rana a lokacin rani, wanda sau da yawa yana hanzarta Warkewa da siminti da taurare busasshen turmi. Ragewar yawan riƙe ruwa yana haifar da jin cewa ƙarfin aiki da juriyar fashewa suna shafar, kuma yana da matuƙar mahimmanci a rage tasirin abubuwan zafin jiki a ƙarƙashin wannan yanayin.
A wannan fanni, ana ɗaukar ƙarin methyl hydroxyethyl cellulose ether a matsayin a sahun gaba a ci gaban fasaha. Duk da cewa adadin methyl hydroxyethyl cellulose ya ƙaru (tsarin bazara), ƙarfin aiki da juriyar tsagewa har yanzu ba za su iya biyan buƙatun amfani ba. Ta hanyar wasu jiyya na musamman akan MC, kamar ƙara matakin etherification, da sauransu, ana iya kiyaye tasirin riƙe ruwa a mafi yawan zafin jiki, don haka zai iya samar da ingantaccen aiki a ƙarƙashin mawuyacin yanayi.
Bai kamata yawan HPMC ya yi yawa ba, in ba haka ba zai ƙara buƙatar ruwa na turmi, zai manne da trowel ɗin, kuma lokacin saitawa zai yi tsayi sosai, wanda zai shafi iya ginawa. Kayayyakin turmi daban-daban suna amfani da HPMC tare da viscosities daban-daban, kuma ba sa amfani da HPMC mai viscosity mai yawa a hankali. Saboda haka, kodayake samfuran hydroxypropyl methylcellulose suna da kyau, ana yaba musu idan aka yi amfani da su da kyau. Zaɓar HPMC da ya dace shine babban alhakin ma'aikatan dakin gwaje-gwaje na kamfanoni. A halin yanzu, dillalai da yawa marasa gaskiya suna haɗa HPMC, kuma ingancinsa bai yi kyau ba. Lokacin zaɓar wani cellulose, dakin gwaje-gwaje ya kamata ya yi aiki mai kyau a cikin gwajin don tabbatar da daidaiton samfurin turmi, kuma kada ku yi kwadayi don arha kuma ku haifar da asara mara amfani.
Lokacin Saƙo: Mayu-04-2023