The Function Mechanism of Redispersible Polymer Powder

Redispersible polymer powder (RDP) is a widely used polymer binder in drymix mortar formulations. The main function of RDP is to improve the bonding strength, workability, and durability of drymix mortars.

The mechanism of action of RDP in drymix mortars involves several steps:

1. Film formation: When RDP is added to drymix mortar, it forms a film on the surface of the particles of the dry mixture. This film helps to increase the adhesion between the particles and improve the bonding strength of the mortar.
2. Plasticization: RDP also acts as a plasticizer in drymix mortar, which means it helps to improve the workability and processability of the mixture. This is achieved by reducing the viscosity of the mixture and making it easier to mix and apply.
3. Water retention: RDP can absorb and hold onto water, which helps to keep the mortar hydrated and workable for a longer period of time. This is particularly important in drymix mortars that need to be transported and stored for extended periods of time.
4. Flexibility: RDP can also improve the flexibility and durability of drymix mortars. This is achieved by enhancing the elasticity and toughness of the mixture, which helps to reduce the likelihood of cracking and other forms of damage.

Overall, the function mechanism of RDP in drymix mortar is based on its ability to form a film, act as a plasticizer, retain water, and improve the flexibility and durability of the mixture. These properties make RDP an important additive for improving the performance and quality of drymix mortars.