How to reduce the amount of water absorbed by the wall during construction?

Solving the industry pain point of high water absorption of the wall - HPMC building additive technology analysis

1.Engineering hidden dangers caused by water absorption of the wall

The water absorption rate of the newly built wall due to capillary action is as high as 15%-20%, resulting in: hollowing and falling of tiles (risk surges when water absorption rate>6%), powdering and cracking of the putty layer (water migration destroys bonding), and the thermal conductivity of energy-saving materials increases by 30% (such as water-absorbing rock wool).

2. HPMC's core water control technology

Triple protection is achieved through hydroxypropyl methylcellulose (viscosity 80,000-150,000 mPa·s):

Physical water-blocking film

Forms a micron-level hydrophobic network in the mortar, reducing the capillary water absorption rate by 60%; measured data: adding 0.2% HPMC to the plaster mortar, the 24h water absorption rate dropped from 18% to 7.3%.

Dynamic moisture management

The slow-release water retention property (>90% water retention rate) ensures that the cement is fully hydrated and reduces the need for water in the later stage; the open time is extended to 50 minutes to avoid repeated wetting of the base.

Bonding enhancement system

Works with cellulose ether to improve the slurry permeability and increase the bonding strength by 2.1MPa.

3. Comparison of HPMC construction schemes

Traditional practices HPMC solution improves efficiency. Interface agent is applied (2 times). 0.3% HPMC is added. 40% of working hours are saved. Water absorption rate is >15%, controllable at 5%-8%. Tile hollowing rate is reduced by 75%. 28-day curing cycle. 21 days to achieve the same strength. Construction period is shortened by 25%.

4. Engineering application scenarios

Tile thin-ply system: HPMC+glue powder compound formula solves the problem of vitrified tile bonding

Self-insulating block plastering: block moisture from invading the EPS particle layer

Basement moisture-proof layer: compound with silane powder to achieve active moisture-proof

Selection suggestion: Derekcell's HPMC is preferred, and the viscosity is adjusted according to the construction method (50,000 mPa·s for mechanical spraying and 100,000 mPa·s for manual construction).