The function of redispersible latex powder:
1. The redispersible latex powder （Rigid adhesive powder Neutral rubber powder Neutral latex powder）forms a film after dispersion and serves as an adhesive to enhance its strength. 2. The protective colloid is absorbed by the mortar system (it will not be destroyed by water or “secondary dispersion” after the film is formed. 3. The film-forming polymer resin is distributed in the whole mortar system as a reinforcement material, thus increasing the cohesion of the mortar; the redispersible latex powder is a powder adhesive made by drying lotion (high molecular polymer) spray. 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 function of RDP : to improve impact resistance, redispersible latex powder 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 by 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, and 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. Improving the bonding strength and cohesion of materials through the use of redispersible latex powder plays a significant role in improving the bonding strength and cohesion of materials. Due to the penetration of polymer particles into the pores and capillaries of the cement matrix, good cohesion is formed after hydration with cement. The excellent bonding force of polymer resin itself improves the adhesion of cement mortar products to substrates, especially cement, an inorganic binder, to wood, fibers, PVC The improvement of poor adhesion of organic substrates such as EPS has a significant effect. Improving freeze-thaw stability effectively prevents material cracking, and the redispersible latex powder has the plastic effect of its thermoplastic resin, which can overcome the damage of thermal expansion and contraction caused by temperature changes on cement mortar materials. 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: Sep-05-2023