Core functions of HPMC in wall putty

1. Basic definition of HPMC and wall putty

HPMC: non-ionic polymer made from modified natural cellulose, cold water soluble, with water retention, thickening, and film-forming properties, FDA and REACH certified, non-toxic and environmentally friendly.

Wall putty: wall leveling material based on cement/gypsum, which must have water retention, crack resistance, easy construction and other properties, and provide a flat base for coatings.

2. Four core values of HPMC in putty

Water retention: Forming hydrated colloids to delay water evaporation, cement hydration rate increased by 15%-20%, crack resistance increased by 30%

Construction performance: Thixotropic lubrication reduces shear stress, open time extended by 40%, spreading efficiency increased by 25%

Bond strength: Enhance substrate-putty interface bonding strength, pull-out strength ≥ 0.6MPa (national standard GB/T 23445)

Anti-sagging: Dynamic viscosity adjustment (shear thinning characteristics), vertical surface construction thickness can reach 3mm without sagging

3. Key points of formula design and application

Recommended dosage: 0.2%-0.5% (total weight of dry powder), can be increased to 0.6% in high temperature and high humidity environment;

Dissolution process: cold water pre-dispersion → 40℃ activation (avoid agglomeration);

Compatibility suggestions:

Synergize with redispersible latex powder (VAE) to improve flexibility;

Compound with wood fiber to enhance crack resistance.

Conclusion

HPMC systematically improves the construction efficiency and finished product quality of wall putty through molecular-level interface regulation (water-retaining film + three-dimensional network structure). Its technical and economical efficiency (cost increase per ton of putty ≤ 30 yuan, comprehensive benefits increased by 50%) and green attributes meet the "high performance + sustainable" transformation needs of the construction industry. In the future, functionalized HPMC (such as temperature-sensitive and instant-soluble) will further expand its application in emerging fields such as prefabricated buildings and artistic coatings.