Redispersible Powder(RDP)

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Redispersible Polymer Powder(RDP)
VitaPlus redispersible polymer powders are homo- and co-polymers based on vinyl acetate, ethylene, vinyl versatate and other monomers. VitaPlus RDP act as organic binders and are mostly used in combination with cement, gypsum and hydrated lime. VitaPlus RDP free-flowing polymer powders are produced by spray-drying of aqueous polymer dispersions, allowing us to supply a wide range of additives with different features. Our products are essential ingredients to enhance critical properties of modern dry-mix mortars such as adhesion, cohesion, flexibility and workability.

Enhance adhesive strength

Redispersible polymer powders enhance the performance characteristics of cementitious ceramic tile adhesives by improving adhesion,Particularly in tile adhesive and bonding mortar, RDP is indispensable

Increase flexibility

Ethylene-rich dispersible polymer powder with excellent flexibility. In exterior insulation mortar, it has excellent adhesion strength and impact resistance.Highly flexible dispersible polymer powder suitable for use in insulation mortars and wall putty

Hydrophobic performance

Ethylene-rich dispersible polymer powders have a certain resistance to water and heat. In particular, C2 standard tile adhesives require the addition of high levels of RDP to meet the standards for water and heat resistance (EN 12004).

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Production of dispersible polymer powder

In spray drying process, the emulsion is first sprayed into tiny droplet. When the liquid droplet is in contact with hot air, it will be converted into ball-shaped powder due to the evaporation of water. The powder consists of polymer particle that is embedded in the protective colloid.

The protective colloid keeps the polymer particle apart, thus preventing the particle from irreversibly fusing together during the spray drying process. The powder is then mixed with anti-caking agent to prevent caking   during the storage of powder.

The working principle of dispersible polymer powder

Dispersible polymer powder consists of vinyl acetate/ethylene copolymer and it can be dispersed in water easily to form stable emulsion. RDP improves adhesion strength, flexural strength, open time, anti-sagging and workability.

The role of dispersible polymer powder in tile adhesives
  • Effectively reduce the modulus of elasticity of mortar, increase flexibility.
  • high elasticity of the film and hard cement wall rigid-flexible combination to enhance the cohesion of the mortar and interfacial bond strength, resistance to external environmental temperature changes on the destruction of the bond.
  • The dispersible polymer powder acts more on the performance of hardened mortar.
The role of dispersible polymer powder in the Exterior insulation and finishing system

Exterior insulation and finishing system (EIFS) prevents the loss of the energy from the interior of a building to its exterior, thus achieving energy-saving effect. The redispersible powder can be added in the adhesive layer, base coat & key coat layer, finishing coat:

  • Adhesive –Use for bonding the insulation material to wall.

  • Base coat & key coat – Apply onto the insulation product with reinforcement (e.g. fiber web) being embedded within it to improve the overall structural impact resistance.

  • Finishingcoat –Top coat to protect the system against weathering.

By using VAE powder in EIFS, one can improve the adhesion strength of mortar that is applied between the wall and the insulation material. Besides, it improves the impact resistance, weathering resistance and cracking resistance of the EIFS.

Storage

Redispersible VAE powder should be stored in cool and dry environment. It is recommended to use the product within 6 months. Use the powder as soon as possible in summer. Storing the powder at high temperature and under humid condition will increase the risk of caking. Once open the packaging bag, please use up the powder possible at once, if not, one shall seal the packaging bag properly to prevent the powder from absorbing the moisture in the air.

For redispersible VAE powder that is packed in paper bag, do not stack them or subject them to compression (in long run) to prevent caking.

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