Ukuhanjiswa kokukhanya kwe-hydroxypropyl methylcellulose kuthinteka kakhulu yila maphuzu alandelayo:
1. Ikhwalithi yezinto zokusetshenziswa.
Okwesibili, umphumela we-alkaliization.
3. Isilinganiso senqubo
4. Isilinganiso se-solvent
5. Umphumela wokungathathi hlangothi
Eminye imikhiqizo ifumile njengobisi ngemva kokuncibilika, eminye imhlophe njengobisi, eminye iphuzi, kanti eminye icacile futhi isobala… Ukuze uxazulule inkinga, lungisa kusuka kumaphuzu alandelayo. Ngezinye izikhathi i-acetic acid ingathinta kakhulu ukuhanjiswa kokukhanya. Kungcono ukusebenzisa i-acetic acid ngemva kokuncibilika. Umthelela omkhulu ukuthi ngabe ukusabela kushukunyiswa ngokulinganayo nokuthi isilinganiso sesistimu sizinzile yini (ezinye izinto zinomswakama futhi okuqukethwe akuzinzile, njenge-solvent esetshenziselwa ukuphinda kusetshenziswe). Eqinisweni, kunezici eziningi ezithintayo. Uma imishini izinzile futhi opharetha beqeqeshwe kahle, umkhiqizo kufanele uzinzile kakhulu. Ukuhanjiswa kokukhanya ngeke kudlule ububanzi buka-±2%, futhi ukufana kokushintshana kwamaqembu ashintshiwe kumele kulawulwe kahle. Esikhundleni sokufana, ukuhanjiswa kokukhanya ngokuqinisekile kuzoba kuhle.
Izici Ezithinta Ukuqina Kwe-Hydroxypropyl Methyl Cellulose
I-hydroxypropyl methylcellulose ene-viscosity ephezulu ayikwazi ukukhiqiza i-cellulose ephezulu kakhulu kuphela ngokuyihlanza nge-vacuum kanye nokufaka esikhundleni se-nitrogen ekukhiqizeni. Ngokuvamile, ukukhiqizwa kwe-cellulose ene-viscosity ephezulu eShayina akunakulawulwa. Kodwa-ke, uma ithuluzi lokulinganisa i-trace oxygen lingafakwa eketheni, ukukhiqizwa kwe-viscosity yayo kungalawulwa ngokwenziwa.
Kwenziwe. Ngaphezu kwalokho, uma ucabangela ijubane lokufaka esikhundleni se-nitrogen, kulula ukukhiqiza imikhiqizo ene-viscosity ephezulu kungakhathaliseki ukuthi uhlelo lungena umoya kangakanani. Yiqiniso, izinga le-polymerization yekotini elicwengisisiwe nalo libalulekile. Uma lokho kungasebenzi, kwenze nge-hydrophobic association. Kunezinhlobo ze-association agent kule ndawo eShayina. Uhlobo luni lwe-association agent okufanele uyikhethe lunethonya elikhulu ekusebenzeni komkhiqizo wokugcina. I-oxygen esele ku-reactor ibangela ukuwohloka kwe-cellulose kanye nokwehla kwesisindo sama-molecule, kodwa i-oxygen esele inqunyelwe, inqobo nje uma ama-molecule aphukile exhunywe kabusha, akunzima ukwenza i-viscosity ephezulu. Kodwa-ke, izinga lokugcwala lihlobene kakhulu nokuqukethwe kwe-hydroxypropyl. Amanye amafektri afuna kuphela ukunciphisa izindleko nentengo, kodwa awafuni ukwandisa okuqukethwe kwe-hydroxypropyl, ngakho ikhwalithi ayikwazi ukufinyelela ezingeni lemikhiqizo efanayo yangaphandle. Izinga lokugcina amanzi lomkhiqizo linobuhlobo obuhle ne-hydroxypropyl, kodwa kuyo yonke inqubo yokusabela, liphinde linqume izinga lokugcina amanzi, umphumela we-alkaliization, isilinganiso se-methyl chloride ne-propylene oxide, ukuhlushwa kwe-alkali kanye nokugcinwa kwamanzi. Isilinganiso sikakotini ocoliwe sinquma ukusebenza komkhiqizo.
Isikhathi sokuthunyelwe: Meyi-23-2023