Comprehensive understanding of dispersible polymer powder (VAE) and its effect on dry mortar

Redispersible latex powder is made of polymer emulsion by spray drying. It is mixed with water in cement mortar, emulsified and dispersed in water, and then regenerates a stable polymer emulsion. After the rubber powder is emulsified and dispersed in water, the water evaporates. The polymer film is formed inside to improve the properties of the mortar. Different redispersible latex powders have different effects on the dry powder mortar.

Which properties of mortar can be improved by redispersible latex powder?

1. Improve the impact resistance, performance and wear resistance of mortar

The mortar is filled with cement mortar pore cavity, the compactness of cement mortar is improved, and the wear resistance is improved. Under the action of external force, it can cause relaxation without being destroyed. Polymer paper can be stored in cement mortar management system.

2. Improve the adhesion of mortar construction

The polymer powder particles have a wetting effect, so that the two components of the cement mortar can flow independently. In addition, the rubber powder has the effect of inducing gas.

3. Improve the bonding compressive strength and cohesive force of mortar

As an organic chemical adhesive, redispersible latex powder can produce high compressive strength and compressive strength on different boards. It plays a very important role in the bonding of cement mortar and organic chemical raw materials (stomach, extruded insulating foam board) and the surface of the cleaning board. Rubber powder is widely used in all cement mortar management systems to improve the cohesion of cement mortar.

4. Improve the aging resistance of mortar, resist freeze-thaw cycles, and prevent cement mortar from cracking

Rubber powder is a thermoplastic resin with good flexibility, which can make the mortar deal with damage caused by external hot and cold environments, and reasonably avoid cracks in the mortar due to temperature changes.

5. Increase the hydrophobicity of the mortar and reduce the moisture content

The rubber powder demulsifies in the cement mortar cavity and surface layer, and the polymer paper is not easy to redisperse after water treatment, blocking water intrusion and improving impermeability.

The main application of redispersible latex powder:

Internal and external wall putty powder, tile adhesive, tile pointing agent, dry powder interface agent, external thermal insulation mortar for external walls, self-leveling mortar, repair mortar, decorative mortar, waterproof mortar external thermal insulation dry-mixed mortar. In the mortar, it is to improve the brittleness, high elastic modulus and other weaknesses of the traditional cement mortar, and to endow the cement mortar with better flexibility and tensile bond strength, so as to resist and delay the generation of cement mortar cracks. Since the polymer and the mortar form an interpenetrating network structure, a continuous polymer film is formed in the pores, which strengthens the bonding between the aggregates and blocks some pores in the mortar, so the modified mortar after hardening is better than cement mortar. There is a big improvement.

Product performance of redispersible latex powder:

1. Improve the bending strength and flexural strength of mortar

The polymer film formed by Zhaojia redispersible polymer powder has good flexibility. Films are formed in the gaps and surfaces of cement mortar particles to form flexible connections. Heavy and brittle cement mortar becomes elastic. Mortar added with redispersible latex powder is several times higher in tensile and flexural resistance than ordinary mortar.

2. Improve the bonding strength and cohesion of mortar

After the redispersible latex powder as an organic binder is formed into a film, it can form high tensile strength and bonding strength on different substrates. It plays an important role in the adhesion of mortar to organic materials (EPS, extruded foam board) and smooth surface substrates. The film-forming polymer rubber powder is distributed throughout the mortar system as a reinforcing material to increase the cohesion of the mortar.

3. Improve the impact resistance, durability and wear resistance of mortar

The rubber powder particles fill the cavity of the mortar, the density of the mortar is increased, and the wear resistance is improved. Under the action of external force, it will produce relaxation without being destroyed. The polymer film can be permanently present in the mortar system.

4. Improve the weather resistance and freeze-thaw resistance of mortar, and prevent mortar from cracking

Rubber powder is a thermoplastic resin with good flexibility, which can make the mortar cope with the change of external cold and hot environment, and effectively prevent the mortar from cracking due to the change of temperature difference.

5. Improve the hydrophobicity of mortar and reduce water absorption

The latex powder forms a film on the mortar cavity and surface, and the polymer film will not disperse again after being exposed to water, which prevents the intrusion of water and improves the impermeability. Special redispersible latex powder with hydrophobic effect, better hydrophobic effect.

6. Improve the workability of mortar construction

There is a lubricating effect between the polymer rubber powder particles, so that the mortar components can flow independently. At the same time, the rubber powder has an inductive effect on the air, giving the mortar compressibility and improving the construction workability of the mortar.