The cold water instant type of hydroxypropyl methyl cellulose HPMC is surface-treated with glyoxal, and it is quickly dispersed in cold water, but it is not really dissolved. When the viscosity rises, the aqueous solution becomes clear. The hot melt type is not surface treated with glyoxal. If the amount of glyoxal is large, the dispersion will be fast, but the viscosity will increase slowly, and the opposite will be when the amount of glyoxal is small. The instant products are mainly used in glue.
HPMC is used in coatings. Due to the relatively uniform and sufficient distribution of substituents, strong antibacterial properties and relatively stable viscosity, instant HPMC can be vigorously promoted in the coating industry as an alternative to HEC. It also has instant solubility, low spatter, good film formation, good flow and leveling, low sag, high brush viscosity, excellent pigment properties and excellent biostability.
The instant hydroxypropyl methylcellulose HPMC is added to water-emulsion coatings as a thickener and film-forming agent, which can make the product stable in storage, uniform in color development, good in rheology, and easy for mechanical construction, which is helpful for improving coatings. According to an expert from the former Soviet Union, the waterproof coating obtained by adding uniform hydroxypropyl methylcellulose can quickly form a film on any type of surface and has good performance. It has good elasticity, air tightness and water resistance.
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