Application of redispersible polymer powder in putty
Release time:
2026-01-13
In the external insulation system for exterior walls, the application of the putty layer must follow the "flexible transition" principle: the flexibility (deformation resistance) of the putty layer must be higher than that of the underlying plaster mortar base, while being lower than that of the decorative coating layer on its surface. This ensures that each layer of material can gradually release and absorb stress, preventing cracking due to incoordination of deformations. Therefore, putty used in insulation systems often requires the addition of a sufficient amount of redispersible polymer powder to ensure adequate flexibility.
In the external insulation system for exterior walls, the application of the putty layer must follow the "flexible transition" principle: the flexibility (deformation resistance) of the putty layer must be higher than that of the underlying plaster mortar base, while being lower than that of the decorative coating layer on its surface. This ensures that each layer of material can gradually release and absorb stress, preventing cracking due to incoordination of deformations. Therefore, putty used in insulation systems often requires the addition of a sufficient amount of redispersible polymer powder to ensure adequate flexibility.
1. Dynamic crack resistance: Specifically designed for anti-crack putty, it can resist dynamic cracks of a certain width.
2. Improve sag resistance: Reduce sagging during ceiling or facade construction.
3. Adhesion to substrates: Significantly enhance the adhesion of putty to various substrates (concrete, plaster mortar, gypsum board, insulation board, etc.), reducing the risk of hollowing and detachment. This is particularly crucial for smooth or low water absorption substrates.
4. Hydrophobic effect: Some latex powders (such as VAE type) can reduce the water absorption rate of putty, enhancing its water resistance and efflorescence resistance.
5. Stress dissipation: When the base layer contracts, expands, or forms microcracks due to temperature changes, humidity changes, or slight structural displacements, the flexible putty layer can absorb and dissipate these stresses through its own deformation, thereby preventing cracks from propagating upwards and avoiding cracking in the decorative layer (paint).
6. Extending open time: Locking in moisture, delaying drying, and giving workers more ample time for sanding and finishing are crucial, especially in high-temperature environments during summer.
7. Alkali resistance: Stably present in cement-based putty, it resists the highly alkaline environment generated by the hydration of cement.
8. Cohesive strength: Enhance the inherent cohesive strength of the putty, rendering it more robust and less prone to generating debris and powder during sanding.
Key words:
redispersible polymer powder ,RDP,putty
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