The redispersible powder is a special water-based emulsion made by spray drying and a polymer binder prepared mainly based on the vinyl acetate-ethylene copolymer. After partial evaporation of water, polymer particles form a layer of polymer film by agglomeration and play the role of adhesive. When redispersible polymer powder is used together with inorganic cementitious minerals such as cement, it can have a modification effect on mortar. Such products are often referred to as polymer mortar. By polymer modification, it has improved the brittleness of the traditional cement mortar, enhanced the flexibility and tensile bond strength of cement mortar, and reduced the incidence of cracks in cement mortar. Since the polymer and cement mortar form an interpenetrating network structure and a continuous polymer film in the pores, strengthening the bond between aggregates and blocking some of the pores within the mortar, the polymer modified mortar after hardening is superior to ordinary cement mortar in all kinds of properties. The main functions of redispersible polymer powder are as follows.
Redispersible polymer powder can significantly improve the bond strength of mortar. The greater the amount is added, the more it will be improved, but the compressive strength will be reduced. Therefore, there exists an optimal range of addition amount. Since the price of redispersible polymer powder is high, the greater the amount is added, the higher the cost of dry mortar will be. Therefore, the cost also needs to be taken into account. High bond strength can have a certain inhibitory effect on the contraction, while the stress generated by deformation is easily dispersed and released, so the bond strength is very important to improve the crack resistance. Studies have shown that the synergistic effect of cellulose ethers and polymer powders could help improve the bond strength of cement mortar.
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Construction chemicals formulations encyclopedia - 1 contains tile and seramic adhesive formulations, production process ofcement based flexible tile and seramic adhesives, making rapid set and cement based tile and ceramic adhesive, grey and white tile and ceramic adhesive formulas, composition ofcement based marble and granite adhesive, manufacturing process of mortar grout ( joint filler ), cement based and polymer added joint fillerformulations, production of color mortar grouts,stamped concrete release powder production process, making stamped concrete colored hardener, formulation of thermal insulation coating plaster, cement based white and grey thermal insulating coating plaster manufacturing process, cement based waterproof coating plaster production process, cement based thermal insulating screed plaster composition, preparation of cement based heat insulation plate mortar, manufacturing process of cement based heat coating insulation plate adhesive mortar, formulations of satin plaster, making cement based and rapid set waterplug, formulations of cement based thick repair mortar,manufacturing process of black patching and reparing paste, making enjection mortar, formula ofkhorasan mortar, production process of hydraulic lime mortar, making gaseous concrete bonding ( adhesive ) mortar, composition and compound of cement based decorative plaster, formulations of plastic paint powder.
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