Hydroxypropyl methylcellulose dissolution method

Hydroxypropyl methylcellulose, also known as HPMC, is a non-ionic cellulose ether obtained by a series of chemical processing with natural polymer material refined cotton as raw material. It is a white or slightly yellowish powder, easily soluble in water. Let’s talk about the dissolving method of hydroxypropyl methylcellulose.

Tools/Materials
Hydroxypropylmethylcellulose
water
method/step
First of all, hydroxypropyl methylcellulose is mainly used as an additive for putty powder, mortar and glue. When added to cement mortar, it can be used as a water-retaining agent and retarder to increase pumpability; when added to putty powder and glue, it can be used as a binder. To improve the spreadability and prolong the operation time, let’s 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, and then dissolved by adding cold water, stirring and cooling;

Specifically: take 1/5-1/3 of the required amount of hot water, stir to make the added product completely swell, and then add the remaining part of the hot water, which can be cold water, or even ice water, and stir to a suitable temperature (10 ° C ) to dissolve completely.

3
Organic solvent wetting method:

Disperse hydroxypropyl methylcellulose in an organic solvent or wet it with an organic solvent, and then add it to cold water or add cold water, it can be well dissolved, and the organic solvent can be ethanol, ethylene glycol, etc.

4
If there is agglomeration and wrapping during dissolution, it is because the stirring is not sufficient or the ordinary model is directly added to the cold water. At this time, it should be stirred quickly.

5
If bubbles are generated during dissolution, it can be left for 2-12 hours (the specific time is determined by the consistency of the solution) or removed by vacuuming, pressurizing, etc., or adding an appropriate amount of defoaming agent.

END
Precautions
Hydroxypropyl methylcellulose is divided into slow-dissolving type and instant-dissolving type. Instant-dissolving hydroxypropyl methylcellulose can be directly dissolved in cold water.