Re-dispersible polymer powder (RDP) is an important additive affecting self-leveling mortars’ performance. It is used in combination with cellulose ether additives to help improve the abrasion resistance and workability of self-leveling mortar performance products. Here is MikaZone, professional cellulose ethers, and re-dispersible polymer powder manufacturer, to explain to you.
What is re-dispersible polymer powder ?
Before we begin, let’s take a brief look at re-dispersible polymer powder.
Re-dispersible polymer powder is a free-flowing white powder of organic polymer powder obtained by spray drying an aqueous dispersion of vinyl acetate-ethylene (VAE) copolymer.
The role of re-dispersible polymer powder in self-leveling mortar
Viscosity
Re-dispersible polymer powder is a widely used organic binder, which can be used in gypsum-based building materials to improve the performance of the product. The initial flow rate of self-leveling mortar will increase with the increase of powder and then decrease because the powder has a certain viscosity in the dissolved water, when the amount of powder is low, the increase of the viscosity of the slurry improves the suspension ability of the slurry to the filler, which is beneficial to the flow of the slurry; when the amount of powder continues to increase, the increase of the viscosity of the slurry leads to the increase of the viscosity of the slurry, and the flow rate shows a decreasing trend.
Bonding strength
Re-dispersible polymer powder as an organic binder, the size of the strength depends on the evaporation of the slurry water, film formation bond strength, affect the evaporation of water in the self-leveling mortar, re-dispersible polymer powder can form a continuous film, with a better bond, the absolute strength of self-leveling mortar increases with the increase of re-dispersible polymer powder admixture.
There are a large number of rod-shaped and column-shaped gypsum dihydrate crystals and irregular fillers in the self-leveling mortar not mixed with re-dispersible polymer powder, and the gypsum dihydrate crystals are staggered and lapped together with each other and between the gypsum dihydrate crystals and the fillers, and the self-leveling mortar is made strong by irregular close piling together, in the self-leveling mortar mixed with re-dispersible polymer powder, the re-dispersible polymer powder forms a filamentous connection in the self-leveling mortar, and forms organic bridging between the gypsum dihydrate crystals and the fillers.
The organic bridge is formed between crystal and crystal, and the organic film is formed on gypsum dihydrate crystal, which wraps and connects the lap parts between gypsum dihydrate crystals, thus increasing the cohesion and bonding force of self-leveling mortar, and improving the strength of self-leveling mortar.
The mastic powder has film-forming property in mortar, which can improve the cohesion and bonding strength of dry mortar, and the film-forming material of mastic powder between gypsum dihydrate crystals and filler has an effective bonding effect on gypsum dihydrate crystal.The film-forming material between gypsum dihydrate crystals and filler forms an effective bond between the gypsum dihydrate crystals and the filler, which improves the cohesion between the gypsum dihydrate crystals and the filler, thus improving the bond strength of the self-leveling mortar on a macro level.
About MikaVae Re-dispersible polymer powder
Re-dispersible polymer powder products are used in self-leveling mortar to improve their processing and final product performance. The addition of self-leveling compounds can significantly improve their flexural and compressive strengths and enhance adhesion to the substrate surface.
Mikavae™ re-dispersible polymer powder has the unique advantages of small dosage, good plasticizing effect, good reinforcement effect, and improved abrasion resistance, which can help solve the technical challenges of self-leveling mortar preparation.
How to make re-dispersible polymer powder better to improve the construction of self-leveling mortar, you can CONTACT MikaZone’s product experts to customize your formulation.