mortar additive hpmcMay 11th 2023
Putty is a coating that is often used as a substrate treatment when painting interior and exterior walls. The main function is to fill in defects in the base wall and to microfine the base surface. For better working results, we recommend the use of HPMC in putty powders.
What is Hydroxypropyl Methylcellulose (HPMC)?
Hydroxypropyl methylcellulose (HPMC) is a non-ionic cellulose ether. It is an odourless and tasteless white powder. It is produced from purified cotton or wood pulp by a series of etherification reactions.
Properties of HPMC
Hydroxypropylmethylcellulose (HPMC) has thermal gelation properties. Its aqueous solution precipitates and gels, then dissolves when cooled. The gelation temperature varies depending on the specification. Its solubility also varies with viscosity, the lower the viscosity, the higher the solubility. HPMC is essentially methane-epoxide-modified methyl cellulose and therefore has similar properties to methyl cellulose, being readily soluble in cold water and insoluble in hot water. The solution does not contain an ionic charge and therefore will not react with metal salts or ionic compounds.
HPMC has good dispersibility, emulsification, thickening, adhesion, water retention, and glue retention properties and is therefore widely used in pharmaceuticals, petrochemicals, construction, ceramics, textiles, food, daily chemicals, synthetic resins, coatings and other fields, as well as electronic products.