HPMC's core enhancement effect on mortar bonding performance

Hydroxypropyl methylcellulose (HPMC) significantly improves the interfacial bonding strength and system cohesion of mortar and substrate through its unique physical and chemical mechanism. The key advantages are reflected in:

1. Optimize the hydration process and strengthen the bonding foundation

Precise water retention regulation: delay water evaporation, ensure sufficient hydration of cement, and avoid bonding attenuation caused by lack of water.

Inhibit plastic shrinkage: reduce shrinkage stress in the early stage of hardening and reduce the risk of micro cracks on the interface.

2. Improve interfacial bonding performance

Enhance substrate wettability: reduce mortar surface tension and promote penetration and spreading on porous/smooth substrates (concrete, insulation board, etc.).

Improve construction adaptability:

Extend open time and ensure construction thickness consistency

Improve anti-sagging and ensure reliability of bonding on vertical/inclined surfaces

3. Enhance system durability

Freeze-thaw stability: Closed pore structure reduces water penetration and inhibits damage to the bonding interface caused by frost heave stress.

Anti-fatigue strengthening: Reduce the risk of bonding layer peeling caused by dry-wet cycles and temperature stress.

IV. Reduce overall costs

Reduce dependence on admixtures: achieve multiple functions such as water retention, viscosity increase, and anti-sagging through a single component, reducing the complexity of the formula.

Extend service life: inhibit cracking and peeling, and reduce maintenance costs.