Redispersible polymer powder (RDP) is an important polymer additive in modern building materials and is widely used in tile adhesives to improve their bonding strength, flexibility and durability.
1. Overview of Redispersible polymer powder
Redispersible polymer powder is a free-flowing powder made from emulsion by spray drying process. It can be redispersed into a polymer dispersion similar to the original emulsion after contacting water. Common types of latex powder include ethylene-vinyl acetate copolymer (EVA), acrylates, ethylene-acrylate copolymer (VAE), etc. Due to its good storage stability, transportation convenience and construction convenience, it is widely used in dry-mixed mortar materials, especially in tile adhesives. It plays a key role.
2. The role of Redispersible polymer powder in tile adhesives
Tile adhesives are a dry-mixed mortar used to stick tiles to the surface of the base, which can be constructed by adding water. Traditional cement mortar has the disadvantages of large shrinkage and low bonding strength, which makes it difficult to meet the needs of modern buildings for firm adhesion and applicability to a variety of base materials. The introduction of Redispersible polymer powder has significantly improved the physical properties and construction performance of tile adhesives, mainly in the following aspects:
Enhanced bonding strength: The polymer particles in the latex powder form a network structure with inorganic gelling materials (such as cement), which enhances the mechanical bite and chemical bonding between the tile adhesive and the tile and the substrate, thereby significantly improving the bonding strength.
Improve flexibility and crack resistance: The flexible properties of the polymer give the adhesive a higher deformation capacity, can absorb small deformations caused by temperature changes, stress transfer, etc., and reduce the risk of cracking. It is especially suitable for large-sized tiles and flexible bases.
Improve construction performance: The Redispersible polymer powder gives the tile adhesive a longer open time, good water retention and lubricity, which is convenient for construction personnel to operate and improves construction efficiency.
Improved water resistance and freeze-thaw resistance: The film formed by the polymer after curing has excellent water resistance and weather resistance, so that the tile adhesive can still maintain stable performance in a humid or climate-changing environment.
3. Usage and precautions
In the production process of tile adhesives, Redispersible polymer powder is usually mixed with dry powder materials such as cement, quartz sand, cellulose ether, etc. in proportion to make a dry mix. Add clean water and stir before use at the construction site. Its dosage is generally 2%~10% of the total amount of adhesive dry powder, and is adjusted according to the required performance level (such as C1, C2, S1, S2 level).
The following points should be noted when using:
Avoid storage in high temperature and high humidity environment: latex powder is easy to agglomerate when wet, and should be sealed and stored in a dry environment.
Compatibility test with other admixtures: Other chemicals in the formula may affect the performance of latex powder, and compatibility should be confirmed through preliminary experiments.
Stir evenly: Stir thoroughly before construction to fully disperse the latex powder and ensure that its functions are fully exerted.
4. Development Prospects
As building materials continue to develop towards green, environmentally friendly and functional directions, the application of Redispersible polymer powder in tile adhesives is becoming more and more widespread, especially in energy-saving and environmentally friendly buildings and prefabricated buildings. In addition, the research and development of latex powder is also moving towards high performance, such as developing low-VOC, high-flexibility, and quick-drying products to meet the needs of different application scenarios.
As an indispensable high-performance modified material in tile adhesives, Redispersible polymer powder has significant advantages in improving product adhesion, flexibility, and water resistance. Reasonable selection and scientific use of latex powder can greatly improve the construction quality and durability of tile paving. With the development of materials science and the advancement of construction technology, its application areas and performance will be further expanded and optimized.
Post time: May-08-2025