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Re-dispersible Polymer, has a remarkable effect in the cement dry-mixed mortar. It can increase the adhesive strength and cohesion strength. It can increase the elasticity, bending strength of the material. Increasing the weather resistance, durability and abrasion performance. It can increasing the hydrophobic ability, reducing water absorption rate. It can improve workability, reducing shrinkage rate of the material. It can prevent crack effectively.
A.Increase Adhesive Strength and Cohesion Strength
It is essential to add RDP to the cement dry-mixed mortar product. It has remarkable effect on increasing the adhesive strength and cohesion strength. This is due to the permeability of the polymer particles to the pores and capillaries of the cement substrate, resulting in the formation of good cohesive strength after hydration of cement. What’s more, polymer particle itself has an excellent adhesive strength in improving cement mortar products adhesive strength, esp. For cement such inorganic adhesive wood, fiber, PVC, EPS, such organic material with poor adhesive ability improvement, more obvious function.
B. Increase Anti-bending and Anti-tensile Ability
In the rigid frame, which is formed in the process of after hydration of cement mortar, the membrane of polymers is elastic and tough, between cement mortar particle and particle, similar to that of the movable joint function, it can bear high load deformation, reducing stress , and improve the anti-tensile and anti-bending ability.
C. Increase Anti-shock Ability
RDP is thermal resin. Coated with soft film on the surface of mortar particle, it can absorb the impact of external force, loose but undestroyed so as to increase the anti-impact ability of mortar.
D. Increase Hydrophobic Ability Reduce Water Absorption Rate
By adding RDP, the micro structure of cement mortar can be improved. Its polymer will form an irreversible network in the process of hydration of cement, sealing the capillary in cement gel, hold back the absorption of water, prevent water permeation so as to increase anti-permeation ability.
By adding RDP, it can increase compactness between the cement particle and polymer film. With the increasing of adhesive strength, the mortar bearing shear stress ability is increased accordingly, making the wearing rate decrease, wearing resistance increasing, and extending the mortar’s service life time
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