Redispersible polymer powder is a key ingredient in many types of mortars, including cement-based mortars and premixed mortars. This powder is used to improve the overall performance and durability of the mortar, making it stronger and more resistant to long-term damage.
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Enhancing Bonding Properties
First and foremost, Redispersible polymer powder is used to enhance the bonding properties of the mortar. When mixed with water, the powder forms a thin film that coats the surface of individual sand and cement particles. This film helps create a stronger bond between the mortar and substrate, which is crucial for the long-term performance of the finished product. Improved adhesion also helps prevent the mortar from cracking over time.
Improving Flexibility and Workability
Another major benefit of redispersible latex powder is its ability to enhance the flexibility and workability of the mortar. This is particularly important for use in areas that are prone to movement, such as building facades or floors. The added flexibility provided by latex powder helps absorb shock and reduces the risk of cracking or damage over time. Additionally, the workability of the mortar is improved, making it easier to apply and shape during installation.
In addition to its adhesive properties and workability benefits, redistributable latex powder can also enhance the water resistance of mortars. This is because latex powder forms a waterproof barrier around the sand and cement particles, preventing moisture from seeping into the mortar and causing deterioration or damage. This is important for use in high humidity areas or applications where waterproofing is required such as showers, swimming pools or other wet environments.
Another major benefit of using redistributable latex powder is its ability to increase the strength and durability of the finished mortar. The film formed by the latex powder helps bind the sand and cement particles more tightly together, creating a stronger composite. Increased strength and durability help extend the life of the finished product, reducing the need for costly repairs or replacements over time.
It’s worth noting that there are different types of redispersible latex powder available, each with its own properties and benefits. Some are designed specifically for cement-based mortars, while others are used in premixed mortars or other special applications. Choosing the correct type of latex powder for a specific application is critical to achieving optimal performance and long-term durability of the finished product.
Redispersible polymer powder plays a key role in many types of mortars, providing increased adhesion, flexibility, water resistance, strength and durability. By understanding how this powder works and the benefits it offers, builders and developers can choose the right type and incorporate it into their mortar mix to achieve superior results.
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VAE Redispersible Powders (RDPs)
What are VAE redispersible powders?
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Vinyl acetate-co-ethylene copolymers (VAE), available from Gantrade Corporation in powder form, are white, free-flowing, dry powders that are readily redispersed into water to re-form a stable emulsion. Sometimes called “solid latex,” VAE redispersible powders (RDPs) are easy to ship, store, handle, and dry-mix versus VAEs in an aqueous emulsion form. VAE RDPs account for the majority of the global market for redispersible polymer powders.
What are the advantages of using redispersible powders versus polymer emulsions?
In addition to the general advantages in handling powders versus emulsions, formulators can dry-mix RDPs with other powders, such as cement, sand, or light aggregate, at a field site or manufacturing location. This dynamic can facilitate consistency and performance reliability. In cold weather environments, freeze-thaw protection is unnecessary.
Performance advantages of incorporating VAE RDPs in dry-mix formulations include improvements in workability after hydration, water retention, plasticity, and improved dispersion. The VAE resins are soft and flexible because of their relatively high ethylene contents. As a rheology modifier, VAE RDPs improve flex strength, crack resistance, adhesion, abrasion and impact resistance, as well as water repellency.
What are the applications for VAE RDPs?
VAE RDPs are used as cement and plaster modifiers or as a binder resin for inorganic materials, such as gypsum and hydrated lime. Formulators also use VAE RDPs as the sole binder resin for construction adhesives. Oilfield operators use VAE powder as an additive in oil and gas well cementing operations to control fluid loss from the cement to the formation. Advantages of RDPs in these environments include freeze protection and transportation benefits.
Applications for VAE RDPs include the formulation of construction materials such as tile adhesives, grouts, finishing plasters, troweling compounds, repair mortars, thin set mortars, and sealing slurries. The dominant market for VAE RDPs is in the building and construction industry, where they are used to formulate dry-mix products. The amount of VAE-RDPs added to cements and plaster is about 2-10 percent, depending on the improvement of strength, impact resistance, adhesion, and water resistance required of the compound.
How do the various grades of VAE RDPs differ?
VAE compositions contain between 10 and 40 percent ethylene in the copolymer. Ethylene is a soft, hydrophobic monomer unit, functioning as an internal “plasticizing” moiety. In copolymers, ethylene effectively reduces the glass transition temperature (Tg) of the hard, polar vinyl acetate polymer. Thus, copolymers with Tgs ranging from +15 °C to -15 °C are achievable. By using ethylene monomer to adjust the Tg, the formulator does not require any external plasticizers and the modified materials exhibit improved flexibility and moisture resistance.
What are the packaging options for VAE RDPs?
Redispersible powders are available from Gantrade Corporation in 25 Kg. multi-layer paper bags containing an inner plastic bag. We package the 25 Kg. bags in 450 Kg. carton boxes, each containing 18 units. Flexible jumbo bags are also available in both 550 Kg. and 600 Kg. sizes within a carton box. VAE RDPs absorb moisture and should be stored under dry and cool conditions to prevent caking.
Gantrade’s professional staff is ready to assist with your selection of VAE RDPs, ensuring that you match the right product to the performance requirements of your application. We can provide an application guide by product grade. Contact us today to get started.
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