I-high-viscosity i-hydroxypropyl methylcellulose ayikwazi ukukhiqiza i-cellulose ephezulu kakhulu kuphela ngokufaka i-vacuum kanye nokushintshwa kwe-nitrogen ekukhiqizeni.Ngokuvamile, ukukhiqizwa kwe-cellulose ephezulu-viscosity e-China akukwazi ukulawulwa.Kodwa-ke, uma ithuluzi lokulinganisa i-oxygen lingafakwa kugedlela, ukukhiqizwa kwe-viscosity yayo kungalawulwa ngokuzenzakalelayo.Ngaphezu kwalokho, uma kucatshangelwa isivinini sokushintsha i-nitrogen, kulula ukukhiqiza imikhiqizo ene-viscosity ephezulu kungakhathaliseki ukuthi uhlelo lunomoya ongakanani.Vele, izinga le-polymerization likakotini ocolisisiwe nalo libalulekile.Uma lokho kungasebenzi, kwenze nge-hydrophobic association.Kukhona ama-agent enhlangano kule ndawo e-China.Hlobo luni lwe-ejenti yenhlangano okufanele uyikhethe enethonya elikhulu ekusebenzeni komkhiqizo wokugcina.
Ukudluliswa kokukhanya kwe-hydroxypropyl methylcellulose kuthinteka kakhulu ngamaphuzu alandelayo:
1. Izinga lempahla eluhlaza.
2. Umphumela we-alkalization.
3. Isilinganiso senqubo.
4. Isilinganiso sama-solvents.
5. Umphumela ongathathi hlangothi.
I-oksijeni esele equkethwe kubhayela izobangela ukuwohloka kwe-cellulose nokunciphisa isisindo samangqamuzana, kodwa i-oksijeni esele ilinganiselwe, uma kuphela ukuxhuma ama-molecule awonakele, okwenza i-viscosity ephezulu ibe lula.Kodwa-ke, izinga lamanzi agcwele futhi linokuxhumana okuqinile nezinga le-hydroxyproline.Ezinye izimboni zifuna nje ukunciphisa izindleko nentengo, futhi azifuni ukwandisa okuqukethwe kwe-hydroxyproline ukuze izinga lingadluli izinga lemikhiqizo ekhiqizwa phesheya.Izinga lokuvikela lomkhiqizo lihlobene ne-phenol yamanzi, kodwa ngokuvamile, inqubo yokusabela iphinde inqume izinga layo lokulondoloza, isilinganiso se-alkali, i-methyl chloride ne-propylene oxide, ukugxila kwe-alkali kanye nenani lamanzi nokotini kunquma ukusebenza kwawo. .
Isikhathi sokuthumela: Apr-23-2023