Umqhaphu osulungekileyo-ukuvulwa-alkalization-etherification-neutralization-ukwahlula-ukuhlamba-ukwahlula-ukumisa-ukutyumza-ukupakisha-kugqityiwe ukuvulwa kwemveliso ye-HPMC: Umqhaphu ococekileyo uvulwa ukususa intsimbi kwaye emva koko utyunyuzwe.Ikotoni ehlanjululweyo ye-pulverized ikwimo yepowder, kunye ne-particle size ye-80 mesh kunye ne-transmittance ye-100%.Ngaphandle koko, kulula ukudibanisa kunye ngexesha lenkqubo yokusabela kunye nokunciphisa ukusebenza kakuhle kwe-etherification.
I-alkalization: Yongeza umqhaphu osulungekisiweyo owenziwe ngumgubo emva kokuvula umqhaphu kwisinyibilikisi esingasebenziyo, kwaye usebenze ngealkali kunye namanzi athambileyo ukudumba i-lattice yomqhaphu osulungekisiweyo ukuququzelela ukugqobhoza kweemolekyuli ze-etherification ye-etherification kunye nokuphucula ukufana kwe-etherification reaction.I-alkali esetyenziselwa i-alkalization yi-metal hydroxide okanye i-alkali ephilayo.Ubungakanani be-alkali eyongeziweyo (ngobunzima, obufana ngezantsi) ngamaxesha e-0.1-0.6 yekotoni ecocekileyo, inani lamanzi athambileyo adityanisiweyo ngama-0.3-1.0 amaxesha ekotoni ecocekileyo;i-solvent inert ngumxube wotywala kunye ne-hydrocarbon, kwaye inani le-solvent ye-inert eyongeziweyo yi-0.3-1.0 ngamaxesha e-cotton ecocekileyo.I-7 -15 amaxesha aloo nto: I-solvent ye-inert ingaba yi-alcohol kunye ne-3-5 i-athomu ye-carbon (njenge-alcohol, propanol), i-acetone.Isenokuba yi-aliphatic hydrocarbons kunye ne-aromatics hydrocarbons;iqondo lokushisa kufuneka lilawulwe ngaphakathi kwe-0-35 ° C ngexesha le-alkalization;ixesha alkalization malunga 1hr.Ukulungiswa kweqondo lokushisa kunye nexesha kunokumiselwa ngokwezinto eziphathekayo kunye neemfuno zemveliso.
I-Etherification: Emva konyango lwe-alkalization, phantsi kweemeko ze-vacuum, i-agent etherification yongezwa kwi-etherification, kunye ne-etherification agent yi-propylene oxide.Ukuze kuncitshiswe ukusetyenziswa kwe-etherification agent, ngexesha lenkqubo ye-etherification, i-agent ye-etherification yongezwa ngamaxesha amabini, isixa esongezelelweyo sokuqala si-1-3.5 ngamaxesha e-cotton ecocekileyo, kwaye inani elipheleleyo lezongezo ezimbini ziyi-1.5. Amaxesha ama-4 kunomqhaphu osulungekileyo.amaxesha.Emva kokuba ungeze i-ejenti etherifying okokuqala, gxobhoza kwi-≤30 ° C kwi-45min-90min, uze uphakamise izinga lokushisa kwi-50-100 ° C kwi-etherification ye-1-5h, uze upholise phantsi ≤30 ° C, okwesibini. ukongeza i-etherification evuselelayo, ixesha elishukumisayo yi-30-120min, kwaye emva koko ishushu ukuya???Ukuqhuba i-etherification, ixesha li-1-4h, ngeli xesha, i-cotton ecocekileyo iphendula ngokupheleleyo kunye ne-etherification agent ukuvelisa i-hYDROXYPROPYL METHYLCELLULOSE HPMC.
Ukutyumza kunye nokupakishwa: ukutyumza kunye nokuhlutha imveliso eyomileyo yokwenziwa kwangoku, ubungakanani beqhekeza lemveliso ye-HPMC yemveliso yangoku emva kokutyumza kunye ne-sieving yi-40 mesh kunye nokuhanjiswa kwe-10096, okanye ngokweemfuno zomsebenzisi.Emva koko pakisha i-HPMC.
Ixesha lokuposa: Nov-24-2022