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.
One: The role of redispersible latex powder in putty is mainly the following aspects
1. Improve the adhesion and mechanical properties of putty. Redispersible latex powder is a powder adhesive made from a special emulsion (high molecular polymer) after spray drying. This powder can quickly redisperse into an emulsion after contacting with water, and has the same properties as the initial emulsion, that is, a film can be formed after the water evaporates. This film has high flexibility, high weather resistance and resistance to various High adhesion to substrates. In addition, the hydrophobic latex powder can make the mortar very waterproof.
2. Improve the cohesion of putty, excellent resistance, alkali resistance, wear resistance, and enhance the flexural strength.
3. Improve the waterproof and permeability of putty.
4. Improve the water retention of putty, increase the open time, and improve workability
5. Improve the impact resistance of putty and enhance the durability of putty.
Two: The role of redispersible latex powder in mortar is mainly the following aspects
1. Improve the compressive strength and flexural strength of mortar.
2. The addition of latex powder increases the elongation rate of the mortar, thereby improving the impact toughness of the mortar, and also endows the mortar with a good stress dispersion effect.
3. Improve the bonding performance of mortar. The bonding mechanism is based on the adsorption and diffusion of macromolecules on the sticky surface. At the same time, the rubber powder has a certain permeability and fully infiltrates the surface of the base material with cellulose ether, so that the surface properties of the base and the new plaster are close, thereby improving Adsorption greatly increases its performance.
4. Reduce the elastic modulus of mortar, improve deformation ability and reduce cracking phenomenon.
5. Improve the wear resistance of mortar. The improvement of wear resistance is mainly due to the existence of a certain amount of glue on the surface of the mortar. The glue powder acts as a bond, and the omentum structure formed by the glue powder can pass through the holes and cracks in the cement mortar. Improves the bond between the base material and cement hydration products, thereby increasing wear resistance.
6. Give the mortar excellent alkali resistance.
Three: The role of redispersible latex powder in tile adhesives is mainly the following aspects
1. As the amount of cement increases, the original strength of the tile adhesive increases, and at the same time, the tensile adhesive strength after immersion in water and the tensile adhesive strength after thermal aging also increase. The amount of cement should be above 35%.
2. With the increase of the amount of redispersible latex powder, the tensile bond strength of tile adhesive after immersion in water and the tensile bond strength after heat aging increase accordingly, but the increase of tensile bond strength after heat aging is relatively low. obvious.
3. With the increase of the amount of cellulose ether, the tensile adhesive strength of tile adhesive after thermal aging increases, and the tensile adhesive strength after soaking in water first increases and then decreases. The effect is best when the cellulose ether content is around 0.3%.
Therefore, when using redispersible latex powder, we must pay attention to the amount used, so that we can really play its role.