HPMC (hydroxypropyl methylcellulose) is a nonionic cellulose ether widely used in dry-mixed mortar. Its main functions in mortar include water retention, thickening, and improved construction performance.

Water retention: HPMC can significantly improve the water retention of mortar and prevent water loss too quickly, thereby ensuring sufficient hydration of cement and enhancing the bonding strength and crack resistance of mortar.

Thickening: HPMC, as a thickener, can increase the viscosity of mortar, improve its bonding strength and anti-sagging performance. This is of great help to the stability and fluidity of mortar during construction.

Improved construction performance: HPMC can improve the workability of mortar, make mortar easier to construct, reduce segregation and water seepage, and ensure construction quality.

Anti-cracking performance: HPMC can effectively inhibit plastic cracks in mortar, reduce the formation of cracks, and improve the overall quality of mortar.

Extended working time: HPMC can extend the open time of mortar, giving construction workers more time to operate.

The application of HPMC in dry-mix mortar greatly improves the performance of the mortar, making it show better adhesion, water retention and crack resistance during the construction process.