What is redispersible polymer powder RDP?
Redispersible polymer powder RDP is a kind of freely movable polymer white powder, which can be easily re-emulsified and dispersed in water to form a stable emulsion.
RDP powder can be mixed with other powdery materials such as cement, sand and lightweight aggregate in the production plant according to a certain proportion in the dry state to obtain cement dry-mixed mortar of good quality and convenient to use. in this way, it can reduce the error and inconvenience when measuring by emulsion mixing in the field construction.
Six functions of redispersible polymer powder:
1. Improve bonding strength and cohesion.
In cement dry powder mortar products, it is extremely necessary to add redispersible latex powder.
It is very significant to improve the bonding strength and cohesion of materials.
This is due to the infiltration of polymer particles into the pores and capillaries of the cement matrix and the hydration of the cement to form a good cohesion strength.
What's more, because of the excellent adhesion of polymer resin itself, it plays a more significant role in improving the adhesion of cement mortar products to substrates, especially the poor adhesion of cement, inorganic binder to wood, fiber, PVC, EPS and other organic substrates.
2.Improve the resistance to bending and tension.
In the rigid skeleton formed after hydration of cement mortar, the polymer membrane is elastic and ductile, which acts like a flow joint between cement mortar particles and particles, which can withstand high deformation load and reduce stress. as a result, the tensile and bending resistance can be improved.
3. Improve the impact resistance.
Re-dispersible latex powder is thermoplastic resin.
The soft film coated on the surface of mortar particles can absorb the impact of external forces and relax without damage, so as to improve the impact resistance of mortar.
4.Improve hydrophobicity and reduce water absorption.
The microstructure of cement mortar can be improved by adding redispersible latex powder.
The polymer forms an irreversible network in the process of cement hydration, which blocks the capillaries in the cement gel, blocks the absorption of water, and prevents the infiltration of water, thus improving the impermeability.
5.Improvement of wear resistance and durability.
The compaction degree between cement mortar particles and polymer film can be increased by adding redispersible latex powder.
The enhancement of bonding force correspondingly improves the ability of mortar to withstand shear stress, reduces the wear rate, improves wear resistance, and prolongs the service life of mortar.
6. Improving freeze-thaw stability to effectively prevent cracking of materials.
The plastic effect of thermoplastic resin of redispersible latex powder can overcome the damage of thermal expansion and cold shrinkage caused by temperature difference.
To overcome the shortcomings of simple cement mortar, such as large dry shrinkage deformation and easy cracking, the material can be flexible, thus the long-term stability of the material can be improved.
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