Ngokubanzi, ekuhlanganiswenii-hydroxypropyl methylcellulose, i-cotton cellulose ecociweyo iphathwa ngesisombululo se-alkali kwi-35-40°C kangangesiqingatha seyure, icinezelwe, i-cellulose iyacolwa, kwaye ivuthwe ngokufanelekileyo kwi-35°C, ukuze iifayibha ze-alkali ezifunyenweyo zibe yi-polymerized ngokwesilinganiso. Faka i-alkali fiber kwi-kettle ye-etherification, yongeza i-propylene oxide kunye ne-methyl chloride ngokulandelelana, kwaye uyitshise kwi-50-80 ℃ iiyure ezi-5 ukuya kuxinzelelo oluphezulu olumalunga ne-1.8 MPa. Emva koko yongeza isixa esifanelekileyo se-hydrochloric acid kunye ne-oxalic acid emanzini ashushu kwi-90°C ukuhlamba izinto ukuze zandise umthamo. Yinyibilikise nge-centrifuge. Hlamba ide ingabi nanto, xa umxholo wamanzi kwizinto ungaphantsi kwe-60%, yomise ngomoya oshushu kwi-130°C ukuya ngaphantsi kwe-5%.
I-Alkalization: Umqhaphu ocociweyo ocociweyo emva kokuvulwa wongezwa kwi-solvent engasebenziyo, kwaye usebenze ngamanzi e-alkali nathambileyo ukuze kuvuvuke i-crystal lattice ye-cotton ecociweyo, enceda ukungena kwee-molecules ze-etherifying agent kwaye iphucule ukufana kwe-etherification reaction. I-alkali esetyenziswa kwi-alkaliization yi-metal hydroxide okanye isiseko se-organic. Ubungakanani be-alkali eyongeziweyo (ngobunzima, obufanayo ngezantsi) buphindwe ka-0.1-0.6 kunomqhaphu ocociweyo, kwaye ubuninzi bamanzi athambileyo buphindwe ka-0.3-1.0 kunomqhaphu ocociweyo; i-solvent engasebenziyo ngumxube wotywala kunye ne-hydrocarbon, kwaye ubuninzi be-solvent engasebenziyo eyongeziweyo yi-cotton ecociweyo. Amaxesha asi-7-15: i-solvent engasebenziyo inokuba yi-alcohol enee-athomu ze-carbon ezi-3-5 (ezifana notywala, i-propanol), i-acetone. Inokuba yi-aliphatic hydrocarbons kunye ne-aromatic hydrocarbons; ubushushu kufuneka bulawulwe ngaphakathi kwe-0-35°C ngexesha le-alkalization; ixesha le-alkalization limalunga neyure eli-1. Ukulungiswa kobushushu kunye nexesha kunokugqitywa ngokweemfuno zezinto kunye nemveliso.
Ukufakelwa kwe-ether: Emva konyango lwe-alkalizing, phantsi kweemeko ze-vacuum, ukufakelwa kwe-ether kwenziwa ngokongeza i-etherifying agent, kwaye i-etherifying agent yi-propylene oxide. Ukuze kuncitshiswe ukusetyenziswa kwe-etherifying agent, i-etherifying agent yongezwa kabini ngexesha lenkqubo yokufakelwa kwe-ether.
Ixesha leposi: Epreli-28-2024