Focus on Cellulose ethers

I-Etherification Synthetic Principle ye-Hydroxypropyl Methyl Cellulose (HPMC)

IHydroxypropyl methylcellulose (HPMC), i-cellulose eluhlaza, ingacolisiswa ukotini noma i-pulp yokhuni, kudingekile kakhulu ukuyichoboza ngaphambi kwe-alkalization noma ngesikhathi se-alkalization, futhi ukuchotshozwa kungokusebenzisa amandla omshini Ukubhubhisa isakhiwo esihlanganisiwe sezinto zokusetshenziswa kwe-cellulose ukunciphisa izinga icrystallinity kanye ne-polymerization, yandisa indawo yayo engaphezulu, ngaleyo ndlela ithuthukisa ukufinyeleleka kanye nekhono lokusabela kwamakhemikhali we-reagent yokusabela emaqenjini amathathu e-hydroxyl eqenjini lendandatho ye-glucose ye-cellulose macromolecule.

IHydroxypropyl methylcellulose (HPMC) isetshenziswa njengengxenye yempahla eluhlaza ukukhiqiza uwoyela, ekwazi ukubona ukusetshenziswa kukashukela usuphelele, ithuthukise izinga lokusetshenziswa kwezinto ezingavuthiwe, inciphise inani elisele le-substrate kumhluzi wokuvutshelwa, futhi yehlise izindleko zamanzi angcolile. ukwelashwa. Le hydroxypropyl methylcellulose Izici ze-methylcellulose zisiza ekuthuthukiseni inqwaba, inqwaba ye-fed-batch kanye nezinqubo zokuvutshelwa okuqhubekayo, ukugwema uchungechunge lwezinkinga ezifana nokulawula ukwakheka kwezinga eliphakathi nendawo kanye ne-dilution; kuyasiza futhi ekulawuleni inqubo yokuvutshelwa. Njengoba ukusebenza kwe-hydroxypropyl methylcellulose (HPMC) kufana namanye ama-ether ancibilikayo emanzini, ingasetshenziswa kupende we-latex kanye nezingxenye zopende ze-resin ezincibilika emanzini njenge-ejenti eyenza ifilimu, i-thickener, emulsifier ne-stabilizer, njll. ukumelana okuhle kokugqokwa, izinga kanye nokunamathela, futhi kuye kwathuthukisa ukungezwani kwendawo, ukuzinza ku-asidi ne-alkali, nokuhambisana nombala wensimbi.

I-Etherification Synthetic

IHydroxypropyl methylcellulose (HPMC) inomphumela omuhle njengokujiya kupende omhlophe we-polyvinyl acetate osuselwe emanzini. Izinga lokushintshwa kwe-cellulose ether liyakhula, futhi ukumelana nokuguguleka kwebhaktheriya nakho kuyathuthukiswa.

Nakuba umgomo we-etherification synthesis we-hydroxypropyl methyl cellulose (HPMC) ungeyona inkimbinkimbi, udinga ukwenziwa i-alkali, impahla eluhlaza ipuliziwe, futhi yenziwe i-alkali. Indawo ngayinye ye-etherification, ukubuyiswa kwe-solvent, i-centrifugation, ukuwasha nokomisa kuhilela inombolo enkulu yobuchwepheshe obubalulekile nolwazi olucebile.

Ezinhlotsheni ezahlukene zemikhiqizo, indawo ngayinye inezimo zokulawula zakamuva, ezifana nezinga lokushisa, isikhathi, ingcindezi nokulawula ukugeleza kwezinto. Amathuluzi asizayo namathuluzi okulawula ayiziqinisekiso ezivumayo zekhwalithi yomkhiqizo ezinzile kanye nezinhlelo zokukhiqiza ezinokwethenjelwa.


Isikhathi sokuthumela: Dec-15-2022
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