Hydroxypropyl methyl cellulose for paint

Cellulose materials that can be used in coatings include methyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose. The most important feature of cellulose thickeners is that they have a significant thickening effect and give the paint a certain degree of water retention, which to some extent slows down the drying time of the paint when it is applied. Cellulose thickeners also give the paint a certain thixotropy and prevent the paint from settling and delaminating in storage. Cellulose thickeners generally only increase the viscosity of coatings at low and medium shear rates.
The thickening effect of hydroxypropyl methyl cellulose is basically the same as that of hydroxyethyl cellulose, i.e. it increases the viscosity of the paint at low and medium shear rates. Hydroxypropylmethylcellulose is resistant to enzymatic degradation. For surface treated hydroxypropylmethylcellulose, it can be added directly to water, stirred and dispersed, then added to alkaline substances such as ammonia, adjusted to pH 8 to 9 and stirred until fully dissolved.