What are the different types of redispersible powders?

Redispersible polymer powder (RDP) is an important type of building material additive, widely used in dry-mix mortar, tile adhesive, exterior wall insulation system, floor materials and other fields. According to its chemical composition, characteristics and application fields, redispersible powder can be mainly divided into the following types:

1. Ethylene-vinyl acetate copolymer (EVA)

EVA type redispersible powder is a polymer formed by the copolymerization of ethylene and vinyl acetate. EVA powder has excellent bonding properties, flexibility and water resistance, and is widely used in building materials such as tile adhesive, interior and exterior wall putty, dry-mix mortar and self-leveling mortar. An important feature of EVA type powder is that it has good crack resistance and freeze-thaw resistance, which can effectively improve the durability of the material.

2. Styrene-butadiene copolymer (SBR)

SBR type redispersible powder is formed by the copolymerization of styrene and butadiene monomers. Since SBR has excellent water resistance, UV resistance and weather resistance, they are widely used in exterior wall coatings, waterproof mortars and repair mortars. The flexibility and wear resistance of SBR powder also make it an ideal choice for floor materials and waterproof coatings.

3. Acrylic copolymers

Acrylic copolymer powders are polymerized from acrylic monomers. This type of powder is known for its excellent weather resistance, transparency and UV resistance, and is widely used in exterior wall coatings, transparent topcoats and high-end tile adhesives. Another feature of acrylic powder is that the film formed after drying has high elasticity and adhesion, which can improve the flexibility and crack resistance of the coating.

4. Ethylene-vinyl acetate-ethylene copolymer (EVA-VeoVa)

This type of redispersible powder is copolymerized from ethylene, vinyl acetate and ethylene. EVA-VeoVa type powders have excellent water resistance and adhesion, as well as certain flexibility and crack resistance, so they are widely used in high-performance tile adhesives, floor mortars and exterior wall insulation systems. The powder also has good alkali resistance and alkaline resistance, and can remain stable under harsh environmental conditions.

5. Ethylene-vinyl acetate-acetic acid copolymer (EVA-VA)

EVA-VA type redispersible powder is copolymerized by ethylene, vinyl acetate and acetic acid, and has excellent water resistance, crack resistance and adhesion. Due to its good performance, EVA-VA powder is often used in tile adhesives, putty powders, exterior wall insulation systems and self-leveling mortars. This type of powder also has good anti-aging properties and can maintain excellent physical and chemical properties in long-term use.

6. Polyvinyl butyral (PVB)

Polyvinyl butyral powder is a special redispersible powder with excellent water resistance and flexibility. PVB powder is widely used in building materials with high water resistance requirements, such as waterproof mortar, waterproof coatings and high-performance putty. In addition, PVB powder also has excellent bonding properties, which can significantly improve the adhesion and wear resistance of materials.

7. Polyurethane (PU)

Polyurethane powder has extremely high elasticity and wear resistance, and is suitable for applications requiring high strength and durability, such as floor mortar, waterproof mortar and high-performance coatings. PU-type redispersible powders also have excellent chemical corrosion resistance, which makes them perform well in harsh environmental conditions.

8. Silicate-modified powder

This type of redispersible powder improves the heat resistance, weather resistance and chemical corrosion resistance of the powder by introducing silicate components into the polymer. Silicate-modified powder is usually used in building materials in high temperature environments or exposed to harsh chemical environments, such as industrial floor coatings and acid-resistant mortars.

9. Epoxy-modified powder

Epoxy-modified powder gives the powder extremely high bonding and chemical resistance by introducing epoxy resin components into the polymer. This type of powder is suitable for applications requiring high-strength bonding and corrosion resistance, such as structural repair mortar, industrial coatings and high-performance floor materials.

There are many types of redispersible powders, and different types of powders have their own unique chemical composition and physical properties, which can meet the diverse needs of building materials. Choosing the right type of redispersible powder requires comprehensive consideration based on specific application scenarios and material requirements. Through reasonable selection and use, these powders can significantly improve the performance of building materials, extend their service life, and meet the needs of different environmental conditions.