HPMC is a key product of Shijiazhuang Cellulose Co., Ltd.Serving as a thickening and water-retention agent in construction applications, it ensures excellent workability and construction results. This chemical powder enjoys widespread popularity and is highly favored by countries around the globe.
The cold-water instant-dissolving grade of Hydroxypropyl Methylcellulose (HPMC) undergoes a surface treatment using glyoxal. When added to cold water, it disperses rapidly; however, this constitutes dispersion rather than true dissolution. True dissolution is achieved only when the viscosity begins to rise and the aqueous solution becomes clear. In contrast, the hot-dissolving grade does not undergo this glyoxal surface treatment. A higher dosage of glyoxal facilitates faster dispersion but results in a slower rise in viscosity; conversely, a lower dosage leads to slower dispersion but a faster rise in viscosity.
Instant-dissolving products are primarily utilized in adhesive formulations.
Qingquan HPMC is specifically designed for use in coatings. Due to its uniform and thorough substituent distribution—which ensures strong resistance to microbial degradation—the instant-dissolving grade of HPMCexhibits relatively stable viscosity. Consequently, it is being vigorously promoted within the coatings industry as a viable substitute for Hydroxyethyl Cellulose (HEC). Its primary advantage lies in its cost-effectiveness; owing to specific manufacturing processes and raw material sourcing, its cost is significantly lower than that of HEC. Furthermore, it offers a host of additional benefits, including instant solubility, low splatter during application, excellent film-forming capabilities, superior flow and leveling properties, high sag resistance, high viscosity suitable for brush application, and excellent pigment compatibility and biological stability.
When incorporated into water-based emulsion coatings as a thickener and film-forming agent, Qingquan instant-dissolving HPMC enhances product storage stability, ensures uniform color development, improves rheological properties, and facilitates easy mechanical application. It also contributes to increased coating flexibility and gloss. According to a relevant expert from the former Soviet Union, waterproof coatings formulated with uniformly distributed HPMC are capable of rapidly forming a film on any type of surface, exhibiting excellent overall performance characterized by superior elasticity, airtightness, and water resistance.
