Hydroxypropyl methylcellulose, also known as hydroxypropyl methylcellulose, is a type of non-ionic cellulose ether. It is a semi synthetic, inactive, viscoelastic polymer commonly used as a lubricant in ophthalmology, or as an excipient or excipient in oral medications.
Produzzjoni metodu:
Ittratta raffinat qoton ċelluloża ma alkali soluzzjoni at 35-40 degree for half an hour, press, crush the cellulose, and age it appropriately at 35 degree to ensure li the average polymerization degree of the obtained alkali fiber is ġewwa the desired range. Put the alkali fiber into ,Put the alkali fiber into the etherification kettle, add epoxy propane and chloromethane in sequence, and etherifie at 50-80 degree for 5 sigħat, with a a massimu pressjoni ta' madwar 1.8 MPa. Then add an appropriate amount of hydrochloric acid and oxalic acid to the 90 degree hot water to wash the material and expand the volume. Dehydrate with a centrifuge, wash sa neutral, and when the umdità content in in the material is below 60%, dry with a hot air flow at 130 degree sa the umdità kontenut is below 5%, il-materjal u fl-aħħar tgħaffiġ permezz a 20 malja għarbiel biex tikseb il - lest prodott.