The function of redispersible latex powder:
1. The dispersible latex powder forms a film and serves as an adhesive to enhance its strength;
2. The protective colloid is absorbed by the mortar system (it will not be damaged by water after film formation, or “secondary dispersion”;
3. The film-forming polymer resin is distributed as a reinforcing material throughout the entire mortar system, thereby increasing the cohesion of the mortar; Redispersible emulsion powder is a kind of powder adhesive made of lotion (high molecular polymer) after spray drying. After contacting with water, this powder can be quickly re dispersed to form lotion, and has the same properties as the initial lotion, that is, the water can form a film after evaporation. This film has high flexibility, high weather resistance and high adhesion to various substrates.
The role of redispersible latex powder:
Improve impact resistance
Redispersible latex powder, which is a thermoplastic resin. It is a soft film coated on the surface of mortar particles, which can absorb the impact of external forces, relax without damage, thereby improving the impact resistance of mortar.
Improving wear resistance and durability
Adding redispersible latex powder can increase the dense bonding between cement mortar particles and polymer films. The enhancement of adhesive strength correspondingly improves the ability of mortar to withstand shear stress, reduces wear rate, improves wear resistance, and prolongs the service life of mortar.
Improving hydrophobicity and reducing water absorption
Adding redispersible latex powder can improve the microstructure of cement mortar. Its polymer forms an irreversible network in the cement hydration process, seals the capillary in the cement gel, blocks the water penetration, and improves the impermeability.
Improve bonding strength and cohesion
Redispersible latex powder has a significant effect on improving the bonding strength and cohesion of materials. Due to the penetration of polymer particles into the pores and capillaries of the cement matrix, it forms good cohesion after hydration with cement. The excellent adhesion of polymer resin itself improves the adhesion of cement mortar products to substrates, especially the poor adhesion of inorganic binders such as cement to organic substrates such as wood, fiber, PVC, and EPS, The effect is obvious.
Improving freeze-thaw stability and effectively preventing material cracking
Redispersible latex powder and its thermoplastic resin can overcome the damage of Thermal expansion of cement mortar caused by temperature difference. Overcoming the characteristics of large dry shrinkage deformation and easy cracking of pure cement mortar can make the material more flexible, thereby improving the long-term stability of the material.
Improve bending and tensile resistance
In the rigid framework formed by the hydration of cement mortar, the membrane of the polymer is elastic and flexible, playing a similar function as a movable joint between cement mortar particles. It can withstand high deformation loads, reduce stress, and improve tensile and bending resistance.
Advantages of redispersible latex powder
No need to store and transport with water, reducing transportation costs; Long storage period, anti freezing, easy to keep; The packaging is small in size, light in weight, and easy to use; It can be mixed with a water-based binder to form a synthetic resin modified premix. When used, only water needs to be added, which not only avoids errors during mixing on site, but also improves the safety of product handling.
Post time: Aug-02-2023