Hydroxypropyl methyl cellulose HPMC, wanda kuma aka sani da hydroxypromellose, foda ne na cellulose ether ko granule wanda ke da ruwan sanyi da rashin narkewar ruwan zafi kamar methyl cellulose. Rukunin Hydroxypropyl da rukunin methyl haɗin ether ne da kuma zoben glucose mai ruwa-ruwa na cellulose da aka haɗa, wani nau'in ether ne na cellulose wanda ba ionic ba ne. Yana da wani polymer mai kama da na roba, mara aiki, viscoelastic wanda aka saba amfani da shi azaman mai shafawa a fannin ido, ko kuma azaman mai taimako ko mai taimako a cikin magungunan baki.
1. Tsarin samarwa
An jiƙa ɓangaren litattafan Kraft mai yawan αcellulose na kashi 97%, ɗanɗanon ciki na 720mL /g da matsakaicin tsawon zare na 2.6mm a cikin maganin NaOH na kashi 49% a zafin ℃ na tsawon daƙiƙa 50. Sannan an fitar da ɓangaren litattafan don cire ƙarin maganin NaOH na kashi 49% don samun cellulose na alkali. Rabon nauyin (49% maganin ruwa na NaOH) zuwa (sashi mai ƙarfi na ɓangaren litattafan) a matakin da aka sanya shi shine 200. Rabon nauyin NaOH a cikin cellulose na alkali zuwa mai ƙarfi a cikin ɓangaren litattafan shine 1.49. An sanya ƙwayar alkali da aka samu (20kg) a cikin na'urar matsi mai jacked tare da tashin hankali na ciki, sannan a yi amfani da injin tsabtace iskar oxygen don cire iskar oxygen daga na'urar. Sannan, an sarrafa zafin jiki a cikin na'urar a zafin ℃ 60 yayin da ake yin motsin ciki.
Sai aka ƙara 2.4kg dME kuma aka daidaita zafin da ke cikin reactor zuwa 60℃. Bayan an ƙara dimethyl ether, an ƙara methylene chloride don yin rabon molar na methylene chloride zuwa NaOH a cikin alkaline cellulose 1.3, an ƙara propylene oxide don yin rabon nauyi na propylene oxide zuwa tauri a cikin ɓangaren litattafan almara 1.97, kuma an daidaita zafin da ke cikin reactor daga 60℃ zuwa 80℃. Bayan an ƙara chloromethane da propylene oxide, an daidaita zafin da ke cikin reactor daga 80℃ zuwa 90℃. Bugu da ƙari, amsawar ta ɗauki mintuna 20 a 90℃.
Sannan ana fitar da iskar gas daga reactor ɗin kuma a cire ɗanyen hydroxypropyl methyl cellulose daga reactor ɗin. Zafin ɗanyen hydroxypropyl methyl cellulose ya kasance digiri 62 a digiri ℃. A auna tarin girman barbashi 50% a cikin rarrabawar girman barbashi bisa ga nauyin da aka tara bisa ga rabon ɗanyen hydroxypropyl methyl cellulose ta hanyar buɗewar sieve guda biyar, kowannensu yana da girman buɗewa daban-daban.
Sakamakon haka, matsakaicin girman barbashi mai kauri shine 6.2mm. An shigar da ɗanyen hydroxypropyl methyl cellulose da aka samu a cikin wani mai ƙwanƙwasa mai ci gaba (KRC kneader S1, L/D = 10.2, ƙarar ciki 0.12 L, saurin juyawa 150rpm) a gudun 10kg/hr, kuma an sami ɗanyen hydroxypropyl methyl cellulose da aka ruɓe. Sakamakon ma'auni iri ɗaya ta amfani da allo 5 tare da girman buɗewa daban-daban, matsakaicin girman barbashi shine 1.4mm. Ƙara ruwan zafi 80℃ zuwa ga ɗanyen hydroxypropyl methyl cellulose da aka ruɓe a cikin tanki tare da sarrafa zafin jiki na jaket ɗin. Adadin rabon nauyin hydroxypropyl methyl cellulose da aka ruɓe zuwa jimlar adadin slurry shine 0.1, kuma an sami slurry ɗin. An motsa slurry ɗin a yanayin zafi na 80℃ na tsawon mintuna 60.
Sannan, ana samar da slurry ɗin zuwa gudun juyawa na 0.5 RPM da kuma matatar matsin lamba mai juyawa (samfuran BHS Sonthofen). Zafin grout ɗin shine 93℃. Yi amfani da famfo don samar da slurry, matsin fitar famfo shine 0.2mpa. Girman buɗewar matatar matsin lamba mai juyawa shine 80μm, kuma yankin matatar shine 0.12m2. Ana tace slurry ɗin da aka bayar ga matatar matsin lamba mai juyawa ta hanyar matatar sannan a mayar da shi kek ɗin tacewa. Ana samar da kek ɗin tacewa da tururi 0.3mpa da ruwan zafi 95℃ tare da rabon nauyi na 10.0 zuwa ga sinadarin da ke cikin HYDROXYpropyl methyl cellulose da aka wanke, wanda sannan ake tace shi ta hanyar matatar.
Ana samar da ruwan zafi ta hanyar famfo a matsin lamba na 0.2mpa. Bayan an samar da ruwan zafi, ana samar da tururi mai nauyin 0.3mpa. Bayan an wanke, ana cire kayan daga saman matattarar ta hanyar scraper sannan a fitar da su daga injin wanki. Ana ci gaba da aiwatar da matakan samar da slurry zuwa fitar da kayan da aka wanke. Kamar yadda aka auna ta amfani da hygrometer mai busar da zafi, yawan ruwan da ke cikin kayan da aka wanke ta haka ya kai kashi 52.8%. An busar da kayayyakin da aka wanke daga matattarar matsi mai juyawa ta hanyar na'urar busar da iska a digiri 80, sannan a niƙa su a injin niƙa na Victory don samun hydroxypropyl methyl cellulose.
2. Aikace-aikacen
HPMCAna amfani da samfurin a matsayin mai kauri, mai wargazawa, mai ɗaurewa, mai emulsifier da kuma mai daidaita masana'antu a masana'antar yadi. Hakanan ana amfani da shi sosai a cikin resin roba, man fetur, yumbu, takarda, fata, magani, abinci, kayan kwalliya da sauran masana'antu.
Lokacin Saƙo: Afrilu-26-2024