I-Hydroxypropyl methylcellulose (HPMC), i-cellulose ekrwada, inokucocwa umqhaphu okanye i-pulp yokhuni, kuyimfuneko kakhulu ukuyityumza phambi kwe-alkalization okanye ngexesha le-alkalization, kwaye ukutyunyuzwa kukusebenzisa amandla omatshini Tshabalalisa isakhiwo esidibeneyo se-cellulose ekrwada ukunciphisa iqondo le-alkalization. icrystallinity kunye nepolymerization, yandisa indawo yayo ephezulu, ngaloo ndlela iphucula ukufikeleleka kunye nesakhono sokusabela kwekhemikhali yereagent yokusabela kumaqela amathathu e-hydroxyl kwiqela leringi yeglucose ye-cellulose macromolecule.
IHydroxypropyl methylcellulose (HPMC) isetyenziswa njenge substrate ekrwada ukuvelisa ioyile, enokuqonda ukusetyenziswa kweswekile iyonke, iphucule izinga lokusetyenziswa kwezinto ezikrwada, inciphise inani elishiyekileyo le-substrate kumhluzi wokubiliswa, kunye nokunciphisa iindleko zamanzi amdaka. unyango. Le hydroxypropyl methylcellulose Iimpawu ze-methylcellulose zihambelana nokulungiswa kwe-batch, i-batch-batch kunye neenkqubo eziqhubekayo zokuvutshelwa, ukuphepha uchungechunge lweengxaki ezifana nokulawula ukubunjwa kwesantya esiphakathi kunye ne-dilution; kukwanceda ukulawulwa kwenkqubo yokuvundisa. Ekubeni ukusebenza kwe-hydroxypropyl methylcellulose (HPMC) kufana nezinye i-ethers ezinyibilikayo zamanzi, zingasetyenziswa kwipeyinti ye-latex kunye ne-resin e-soluble yamanzi yepeyinti yepeyinti njenge-agent-forming agent, i-thickener, i-emulsifier kunye ne-stabilizer, njl. Ukumelana nokunxiba kakuhle, ukulinganisa kunye nokubambelela, kwaye kuphuculwe ukunyanzeliswa komphezulu, ukuzinza kwi-asidi kunye ne-alkali, kunye nokuhambelana ne-pigments yensimbi.
I-Hydroxypropyl methylcellulose (HPMC) inefuthe elihle njenge-thickener yepeyinti emhlophe ye-polyvinyl acetate yamanzi. Iqondo lokutshintshwa kwe-cellulose ether linyukile, kwaye ukuchasana nokukhukuliseka kwebhaktheriya kuye kwandiswa.
Nangona umgaqo-siseko we-etherification synthesis ye-hydroxypropyl methyl cellulose (HPMC) awuntsokothanga, kufuneka yenziwe ialkali, imathiriyeli ekrwada icolwe, kwaye yenziwe ialkali. Indawo nganye ye-etherification, ukubuyiswa kwe-solvent, i-centrifugation, ukuhlamba kunye nokomisa kubandakanya inani elikhulu lobuchwepheshe obuphambili kunye nolwazi olutyebileyo.
Kwiintlobo ezahlukeneyo zeemveliso, indawo nganye ineemeko zokulawula zamva nje, ezifana nobushushu, ixesha, uxinzelelo kunye nolawulo lokuhamba kwezinto. Izixhobo ezincedisayo kunye nezixhobo zokulawula ziziqinisekiso ezifanelekileyo zomgangatho wemveliso ozinzile kunye neenkqubo ezithembekileyo zemveliso.
Ixesha lokuposa: Dec-15-2022