HPMC manufacturer-How to choose the water retention agent quality of hydroxypropyl cellulose
Hydroxypropyl methylcellulose enters water to form a transparent gel with light transmittance, which is expected to be good, indicating a decrease in insolubility. Generalization through the reactor is generally good, the level of the reactor is not very favorable, but does not account for the mass ratio of the level of reactor production to the establishment of production wells, there are multiple factors that determine the quality of the product.
The filter paper method is to evaluate the water absorption of hydroxypropyl methylcellulose moisture through filter paper. Test the mold, filter paper and glass tray combination with a metal ring at a certain height. The 6 layers of filter paper under the test mode, the first layer is the fast filter paper, and the other five layers are the slow filter paper. Weigh the first layer and the 5-layer slow filter with a precision balance, the filter paper weight will enter the test mode after mixing in the mortar and scrape it off, and place it for 15min; weigh the tray and the 5-layer slow filter paper filter paper weight. According to the following formula:
M = (m1-m2)/S
M — moisture loss, g/mm2
M1 — the weight of the tray 5 layers of slow filter paper; G
M2 — 5-layer slow filter filter paper weight in tray after 15 minutes; GS – test area mm2
You can also directly observe the degree of absorbent paper filter paper, the lower the water absorption rate, the better the water retention. The test method is easy to operate, and the general business meets the experimental conditions.