Hydroxypropyl methylcellulose, also known as HPMC, is a nonionic cellulose ether obtained from refined cotton, a natural polymer material, through a series of chemical processes. It is a white or slightly yellow powder that is easily soluble in water. Let’s talk about the dissolution method of hydroxypropyl methylcellulose.
1. Hydroxypropyl methylcellulose is mainly used as an additive for putty powder, mortar and glue. Added to cement mortar, it can be used as a water-retaining agent and retardant to increase pumpability; added to putty powder and glue, it can be used as a binder. In order to improve the spreadability and extend the operating time, we take Qingquan Cellulose as an example to explain the dissolution method of hydroxypropyl methylcellulose.
2. Ordinary hydroxypropyl methylcellulose is first stirred and dispersed with hot water, then added with cold water, stirred and cooled to dissolve;
Specifically: take 1/5-1/3 of the required amount of hot water, stir until the added product is completely swollen, then add the remaining part of the hot water, which can be cold water or even ice water, and stir to the appropriate temperature (10°C ) until completely dissolved.
3. Organic solvent wetting method:
Disperse hydroxypropyl methylcellulose in an organic solvent or moisten it with an organic solvent, and then add or add cold water to dissolve it well. The organic solvent can be ethanol, ethylene glycol, etc.
4. If agglomeration or wrapping occurs during dissolution, it is because the stirring is insufficient or the ordinary model is added directly to cold water. At this point, stir quickly.
5. If bubbles are generated during dissolution, they can be left for 2-12 hours (the specific time depends on the consistency of the solution) or removed by vacuuming, pressurizing, etc., or adding an appropriate amount of defoaming agent.
Precautions
Hydroxypropyl methylcellulose is divided into slow-dissolving and instant-dissolving types. Instant hydroxypropyl methylcellulose can be directly dissolved in cold water.
Post time: Feb-06-2024