Focus on Cellulose ethers

Etherification Synthetic Principle of Hydroxypropyl Methyl Cellulose (HPMC)

Hydroxypropyl methylcellulose (HPMC), selulose e tala, e ka hloekisoa k'hothone kapa makhasi a lehong, ho hlokahala haholo ho e sila pele ho alkalization kapa nakong ea alkalization, 'me ho sithabela ke ka matla a mochine Senya sebopeho se akaretsang sa lisebelisoa tse tala tsa cellulose ho fokotsa tekanyo ea crystallinity le polymerization, e eketsa sebaka sa eona, ka tsela eo e ntlafatsa phihlello le bokhoni ba karabelo ea lik'hemik'hale ea reagent ea karabelo ho lihlopha tse tharo tsa hydroxyl tse sehlopheng sa lesale la tsoekere la cellulose macromolecule.

Hydroxypropyl methylcellulose (HPMC) e sebelisoa e le substrate e tala ho hlahisa oli, e ka hlokomelang ts'ebeliso ea tsoekere e felletseng, ea ntlafatsa sekhahla sa ts'ebeliso ea lisebelisoa tse tala, ea fokotsa palo e setseng ea substrate ka har'a moro oa belisoa, le ho fokotsa litšenyehelo tsa metsi a litšila. phekolo. Sena se hydroxypropyl methylcellulose Litšobotsi tsa methylcellulose li thusa ho ntlafala ha batch, fed-batch le mekhoa e tsoelang pele ea ho belisoa, ho qoba letoto la mathata a kang ho laola ho hlophisoa ha sekhahla se bohareng le sa dilution; e boetse e thusa ho laola mokhoa oa ho belisa. Kaha ts'ebetso ea hydroxypropyl methylcellulose (HPMC) e tšoana le li-ether tse ling tse qhibilihang ka metsing, e ka sebelisoa ka pente ea latex le likaroloana tsa pente ea resin e qhibilihang ka metsi e le moemeli oa ho etsa filimi, thickener, emulsifier le stabilizer, joalo-joalo Filimi e na le ho hanyetsa ho apara hantle, ho lekana le ho khomarela, 'me ho ntlafalitse tsitsipano ea holim'a metsi, botsitso ho acid le alkali, le ho lumellana le li-pigments tsa tšepe.

Etherification Synthetic

Hydroxypropyl methylcellulose (HPMC) e na le phello e ntle joalo ka motenya bakeng sa pente e tšoeu ea polyvinyl acetate ea metsi. Tekanyo ea ho nkela sebaka sa cellulose ether ea eketseha, 'me ho hanyetsa khoholeho ea baktheria le hona hoa ntlafatsoa.

Leha molao-motheo oa etherification synthesis oa hydroxypropyl methyl cellulose (HPMC) o sa rarahane, o hloka ho etsoa alkalized, lisebelisoa tse tala li silafatsoe, 'me li be le alkali. Tikoloho e 'ngoe le e' ngoe ea etherification, ho hlaphoheloa ha solvent, centrifugation, ho hlatsoa le ho omisa ho kenyelletsa palo e kholo ea theknoloji ea bohlokoa le tsebo e ruileng.

Bakeng sa mefuta e fapaneng ea lihlahisoa, tikoloho ka 'ngoe e na le maemo a morao-rao a taolo, joalo ka mocheso, nako, khatello le taolo ea phallo ea thepa. Lisebelisoa tse thusang le lisebelisoa tsa ho laola ke litiiso tse ntle bakeng sa boleng bo tsitsitseng ba sehlahisoa le mekhoa e tšepahalang ea tlhahiso.


Nako ea poso: Dec-15-2022
Moqoqo oa Marang-rang oa WhatsApp!