What Is Redispersible Polymer Powder?
Redispersible polymer powder is a polymer emulsion that is converted into a powdered thermoplastic resin material through a series of processes such as high temperature and high pressure, spray drying, and surface treatment. When mixed with water, these powdery organic binders can be re-dispersed in water back into a new emulsion, and their properties are basically the same as the original copolymer emulsion.
Adding redispersible polymer powder to the mortar can improve the cohesiveness, cohesion and elasticity of the mortar. One is to improve the water retention of the mortar, form a film, and reduce the evaporation of water. Secondly, the bonding strength of the mortar can be improved.
This redispersible polymer powder was invented by the German Wacker Hemie in 1953, which made it possible to produce polymer-modified RDP For Dry mix mortar. The development of redispersible polymer powders has only a history of more than 50 years. In 1953, Germany invented the world's first practical redispersible powders. With the continuous innovation and progress of the follow-up product production process, combined with the follow-up application, a series of results have been achieved and a series of products have been developed.
The world's first redispersible polymer powder is vinyl acetate homopolymer powder. But this kind of polymer powder can only be used in non-alkaline systems, because esters or polymers with ester bonds react under alkaline conditions to generate free alcohols or acid salts, so that the performance changes from insoluble to water solubility, and that the increase in the glass transition temperature will lose the required elasticity, or due to other reasons. In 1960, ethylene-vinyl acetate copolymer powder (EVA) was successfully produced. EVA mainly uses ethylene, a non-saponifiable organic monomer, to internally plasticize the redispersible polymer powder, which significantly improves the flexibility of the polymer powder. The polymer powder can be used in the alkaline system of Portland cement.
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