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.
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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 , 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 , 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 , 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.
Redispersible powders have become an integral component in the construction industry, especially when it comes to enhancing the properties of materials like tile adhesives, mortars, and other cementitious systems. These powders, when mixed with water, redisperse into their original polymer emulsion form, offering a myriad of benefits to the final product. Let&#;s delve into the different types of redispersible powders and their unique characteristics.
At its core, a redispersible powder is a polymer emulsion that has undergone spray drying. This process transforms the liquid emulsion into a free-flowing powder form. When this powder is mixed with water, it returns to its original emulsion state, allowing it to impart its beneficial properties to the mixture.
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One of the primary reasons for the inclusion of redispersible powders in construction materials is their ability to improve rheological properties. This means that they can modify the flow and spread of materials, making them easier to apply and ensuring a smoother finish.
Water resistance is another crucial attribute enhanced by these powders. By incorporating them into the mix, materials like tile adhesives become less susceptible to water damage, ensuring longevity and durability.
Furthermore, bond strength is significantly improved. This ensures that tiles, for instance, adhere more securely to their substrates, reducing the risk of detachment or failure.
The market currently offers several types of redispersible polymer powders. Among the most prevalent are:
Apart from the primary types of redispersible powders, there are other components that play a role in their efficacy. Polyvinyl alcohol, for instance, is often used as a protective colloid during the spray drying process. This ensures that the powder remains free-flowing and doesn&#;t clump together.
Redispersible powders have undeniably revolutionized the construction industry. Their ability to enhance properties like bond strength, water resistance, and rheological characteristics makes them indispensable in modern construction materials.
For those in the concrete admixture industry, sourcing high-quality raw materials is paramount. At Bisley International, we pride ourselves on supplying top-tier products to meet your needs. Whether you&#;re looking to enhance bond strength, water resistance, or any other property, browse our range of products to find the perfect solution for your requirements.
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