Pó de polímero dispersível

Re-dispersible Polymer Powder (RDP) is a free-flowing powder produced from polymer emulsions through a spray-drying process. When added to cement-based or gypsum-based mixtures and mixed with water, it re-disperses into an emulsion, thereby enhancing the product's performance. Today, re-dispersible latex powder has become an indispensable ingredient in numerous construction applications.   1 Common Applications of Re-dispersible Latex Powder Tile Adhesives Traditional cement-based adhesives often struggle to provide sufficient bond strength. By incorporating Dispersible polymer powder, manufacturers can produce products featuring excellent adhesion, flexibility, and water resistance. The polymer film formed by the re-dispersible polymer powder helps bridge micro-cracks in the substrate, reducing the risk of tiles detaching over time. Furthermore, it allows for better accommodation of substrate movement, extending the service life of the tiled surface while preventing water damage to the underlying structure. Self-Leveling Compounds Re-dispersible polymer powder improves application properties and enhances adhesion to the substrate, making the material easier to apply, yielding a smoother surface finish, and strengthening the bond between the self-leveling mortar and the base layer—thereby reducing the risk of subsequent cracking. The inherent flexibility of the re-dispersible polymer powder enables the self-leveling mortar to better accommodate minor movements in the substrate, effectively preventing the formation of cracks. Exterior Insulation and Finish Systems (EIFS) Incorporating re-dispersible latex powder into the base coat of Exterior Insulation and Finish Systems (EIFS) enhances overall flexibility and crack resistance, enabling the system to withstand stresses caused by thermal expansion and contraction, while simultaneously improving the bond strength between the various layers of the system. Base coats modified with re-dispersible latex powder exhibit superior impact resistance, helping to protect the insulation layer from damage and boosting the overall durability of the system. Cement-Based Waterproofing Membranes Waterproofing membranes are utilized to protect structures—such as basements, foundations, and roofs—against water ingress. The inclusion of re-dispersible polymer powder in membrane formulations endows the product with exceptional flexibility, crack-bridging capabilities, and adhesion to the substrate. The polymer films formed within the cementitious matrix help seal microcracks and provide excellent waterproofing properties. Repair Mortars Re-dispersible polymer powder enhances the adhesion between repair mortars and existing concrete substrates, while also improving the mortar's flexibility. This allows the mortar to better accommodate differential movements between the repair material and the existing concrete, thereby reducing the risk of cracking and delamination.   2 Classification of Re-dispersible Polymer Powders Based on their polymer composition, re-dispersible polymer powders are primarily categorized into the following types, each with distinct performance characteristics and application focuses: VAE Type (Vinyl Acetate–ethylene Copolymer Emulsion) The VAE type is currently the most widely used category. It offers good flexibility, adhesion, and workability, as well as a high cost-performance ratio. It is suitable for standard dry-mix mortar systems, such as tile adhesives, rendering mortars, and self-leveling mortars. VA/VeoVa Type (Vinyl Acetate-Vinyl Versatate Copolymer) Building upon the VAE base, this type incorporates hydrophobic groups to provide superior water and alkali resistance. It is suitable for applications requiring high weather resistance, such as Exterior Insulation and Finish Systems (EIFS) and waterproofing mortars. Acrylic Type Acrylic-based RDPs exhibit excellent resistance to water, weathering, and UV radiation. They are suitable for high-end applications or those requiring exceptional durability—such as exterior wall coating systems and specialized repair materials—though their cost is relatively higher.   3 Considerations When Selecting Re-dispersible Polymer Powder Glass Transition Temperature (Tg) The lower the Tg, the better the polymer's flexibility and film-forming properties; however, a balance must be struck between flexibility and compressive strength. Minimum Film Formation Temperature (MFFT) The lower the MFFT, the more easily the material forms a continuous film under low-temperature conditions, making it suitable for construction in cold environments. Viscosity In dry-mix mortar products, viscosity requirements are generally not critical, with the exception of self-leveling cement systems, which have specific viscosity demands. If the powder is intended for use in self-leveling systems, it is advisable to select a re-dispersible polymer powder with low viscosity. Anti-caking Agents The inclusion of anti-caking agents can have a significant impact on adhesive strength; therefore, it is essential to conduct adhesion strength tests prior to purchasing. Re-dispersible latex powder is widely used in the construction industry. In practical applications, various modification measures endow re-dispersible latex powder with distinct properties, such as water resistance, alkali resistance, abrasion resistance, stain resistance, and flexibility.   Website: www.elephchem.com whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

O pó de emulsão redispersível é primeiro misturado fisicamente com outros materiais de cimentação inorgânicos (como cimento, cal hidratada, etc.) e vários agregados e aditivos para fazer argamassa mista seca. Quando a argamassa seca é misturada com água, sob a ação do colóide protetor hidrofílico (álcool polivinílico) e força de cisalhamento mecânico, as partículas de pó de borracha são dispersas na água e afetam a reologia, construtibilidade, resistência à flexão compressiva e resistência à tração da argamassa.   O aglutinante para ladrilhos cerâmicos é o material de colagem à base de cimento para ladrilhos cerâmicos, que pode ser usado para colar pedras naturais, como ladrilhos cerâmicos, tijolos polidos e granito. A adição de pó de emulsão redispersível pode estender o tempo de trabalho e ajustar o tempo da argamassa recém-misturada, melhorar o desempenho de retenção de água e desempenho anti-enforcamento; Melhore a propriedade de ligação, a resistência à deformação e ao envelhecimento da argamassa endurecida.   O sistema de isolamento de parede externa tem sido aplicado em todo o mundo, e sua instalação na parede externa do edifício economiza principalmente o consumo de energia do edifício em 40% -70%. Argamassa de mistura seca modificada com pó de emulsão redispersiva é usada para colar a placa de poliestireno à parede enquanto protege a placa de poliestireno. Tanto para argamassas de proteção como para argamassas decorativas à base de cimento, o pó adesivo polimérico proporciona boa aderência, resistência ao impacto, baixa absorção de água e alta flexibilidade mesmo em ambientes agressivos.   Após a formação do filme, a emulsão e o pó de emulsão redispersa podem formar alta resistência à tração e resistência de ligação em diferentes materiais, e são combinados com o cimento como o segundo aglutinante na argamassa, e o cimento e o polímero desempenham as características especiais correspondentes, respectivamente, de modo que o desempenho da argamassa pode ser melhorado.   Mesmo que o tipo de copolímero em pó de emulsão seja o mesmo, devido aos diferentes processos de produção de diferentes fabricantes, as propriedades do pó de látex são diferentes, e suas propriedades na argamassa correspondente devem ser consideradas de forma abrangente ao selecionar o pó de borracha. Com o aumento da promoção nacional do uso de argamassa mista seca, a demanda por emulsão em pó redispersível apresenta um rápido crescimento, o que deverá inaugurar um novo pico de utilização.   Site: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com JiangSu ElephChem Holding Limited, especialista profissional do mercado em Álcool Polivinílico (PVA) e Emulsão de copolímero de acetato de vinila-etileno(VAE) com forte reconhecimento e excelentes instalações fabris de padrões internacionais.