Redispersible latex powder as an important additive of dry-mixed mortar

Redispersible latex powder is a powder dispersion made of modified polymer emulsion by spray drying. It has excellent permeability and can be re-emulsioned into a stable polymer emulsion after water release. The organic chemistry is exactly the same as the original moisturizing lotion. Therefore, it becomes possible to manufacture high-quality dry powder mortar, thereby improving the performance of cement mortar.

Redispersible latex powder is an important functional additive for mortar. It can improve the performance of mortar, increase the compressive strength of cement mortar, improve the bonding strength of cement mortar and various boards, and improve the strength of cement mortar. Softness and deformability, tensile strength, compressive strength, abrasion resistance, ductility, adhesion racing and water-locking ability, and constructability. In addition, the natural latex powder with water repellency can make the cement mortar have good moisture resistance.

Improve the cohesion of cement mortar in engineering construction. After the freshly mixed cement mortar with natural latex powder dispersion liquid is formed, the water content will gradually decrease with the digestion and absorption of water by the base, the consumption of solidification reaction, and the evaporation to air. , the particles are gradually approaching, the pages are gradually blurred, and they are gradually combined with each other. Finally, the polymer is demulsified. The whole process of polymer demulsification is divided into three links. In the original moisturizing emulsion, the polymer particles are in the form of Brownian motion. Move freely, along with the volatilization of water, the movement of particles is naturally subject to more and more restrictions, the surface tension of water and gas promotes them to sort together slowly, the second stage, when the particles start to touch each other, the network Shaped water volatilizes through capillaries, and the high-porous supporting force released on the surface of the particles causes the deformation of the natural latex spheres to make them bond together, and the remaining water fills the pores, and the membrane is probably formed. The third The final step is to make the diffusion of polymer molecules (sometimes called self-adhesiveness) form a real continuous film during the demulsification process.