Redispersible polymer powders are polymer emulsions which have been converted by a series of process such as high temperatures and pressures, spray drying and surface treatment to powdered thermoplastic resin materials. When mixed with water, these powdered organic binders can redisperse in water back into new emulsions with essentially identical properties to the original copolymer emulsions.
The addition of redispersible polymer powders into mortar can increase the cohesiveness, cohesion and flexibility of mortar. First, it can improve the water retention of mortar and form a film to reduce evaporation of water. Second, it can improve the bond strength of mortar.
The redispersible polymer powder was invented by a German named Wacker Hemie in 1953, which makes it possible to produce polymer modified dry-mix mortar. The history of redispersible polymer powder is only over 50 years up to now. In 1953, the world’s first batch of practical redispersible powder was invented in Germany. With continuous innovation and progress in the production technique of subsequent products, it has achieved a series of results and developed a series of products by in combination with subsequent applications.
The world’s first kind of redispersible polymer powder is vinyl acetate homopolymer powder. But this kind of polymer powder can only be used in non-alkaline systems, since esters or polymers with ester bonds react to form free alcohols or acid salts in alkaline conditions, thus bringing about sudden changes in the performance, from non-water-soluble into water-soluble, and that the increase in the glass-transition temperature will lose the required flexibility, or for other reasons. In 1960, the ethylene-vinyl acetate copolymer powder (EVA) was successfully produced, which mainly uses ethylene, the unsaponifiable organic monomer, for internal plasticization on the redispersible polymer powder and to significantly improve the flexibility of polymer powder. Polymer powder of this kind can be used for the alkaline system of Portland cement.
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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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