hydroxypropyl methylcellulose HPMC in Plastering MortarFebruary 2nd 2023
The light transmittance of hydroxypropyl methyl cellulose is mainly affected by the following points:
First, the quality of raw materials.
Two, the effect of alkalization.
Three, process ratio
Four, the ratio of solvent
Five, the effect of neutralization
Some products are made to dissolve after the elephant added milk is very turbid, have a plenty of milky white, have a plenty of yellow, have a plenty of clear and transparent. Want to solve from the above adjustment.
Sometimes acetic acid can seriously affect the transmittance. It is best to dilute acetic acid and use it, but the biggest influence is whether the reaction is even and the system ratio is stable (some materials have unstable moisture and content, such as recycling the applied solvent). In fact, many factors are influencing it. Production should be stable if the equipment is stable and the operator is well trained. The transmittance should not exceed ±2%, and the uniformity of substituting groups should be well controlled.
Instead of uniformity, transmittance is definitely good