Hot water dissolution method: Since HPMC does not dissolve in hot water, HPMC can be evenly dispersed in hot water at the initial stage, and then quickly dissolved when cooled, two typical methods are described as follows:
1) Put the required amount of hot water in the container and heat it to about 70°C. Hydroxypropyl methylcellulose is gradually added with slow stirring, and HPMC begins to float on the surface of the water, and then gradually forms a slurry that cools under agitation.
2) Add the required amount of 1/3 or 2/3 water to the container, and heat to 70 °C, according to the method of 1), disperse the HPMC, prepare hot water slurry, and then add the remaining amount of cold water to the hot water slurry, stir and cool the mixture.
Powder mixing method: HPMC powder is fully mixed with a large number of other powdery substances, mixed with a blender, and then dissolved with water, then HPMC can be dissolved at this time, without agglomeration, because in each small corner, there is only a little bit of HPMC powder, which will be dissolved immediately when exposed to water. - Putty powder and mortar production enterprises use this method. [ Hydroxypropyl methyl cellulose (HPMC) is used as a thickener and water retention agent in putty mortar. ]
