The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
Redispersible polymer powder is water-soluble redispersible powders. It is divided into ethylene/vinyl acetate copolymer, vinyl acetate/vinyl tertiary carbonate copolymer, acrylic acid copolymer, etc., and is powder bonded after spray drying. It uses polyvinyl alcohol as a protective colloid. This kind of powder can be quickly redispersed into emulsion after contact with water. Because redispersible polymer powder has high bonding ability and unique properties, such as: water resistance, construction and heat insulation, etc., Therefore, its scope of application is extremely wide.
The role of redispersible polymer 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 of the mortar, thereby improving the impact toughness of the mortar, and also imparts a good stress dispersion effect to the mortar;
3, Improve the bonding performance of the mortar. The bonding mechanism relies on the adsorption and diffusion of macromolecules on the sticky surface. At the same time, the polymer powder has a certain degree of permeability. Together with cellulose ether, it can fully infiltrate the surface of the base material, so that the base layer and the new plaster have a surface performance close to that of the new plaster, thereby improving adsorbability, and greatly increases its performance.
4, Reduce the elastic modulus of the mortar, improve the deformability, and reduce the cracking phenomenon;
5, Improve the abrasion resistance of the mortar. The improvement of abrasion resistance is mainly due to the presence of a certain amount of glue on the surface of the mortar. Handow chemicals, the redispersible powder plays a binding role, and the omentum structure formed by the polymer powder can pass through the holes in the cement mortar, rift. Improve the bonding of the base material and the cement hydration product, thereby improving the wear resistance;
6, Give the mortar excellent alkali resistance.
The role of redispersible polymer powder in tile adhesive is mainly the following aspects
1, As the amount of cement increases, the original strength of tile adhesive increases. Meanwhile, 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 in the amount of redispersible latex powder, the tensile bond strength of the tile adhesive after immersion in water and the tensile bond strength after thermal aging increase, but the increase in tensile bond strength after thermal aging is more obvious;
3.With the increase in the amount of cellulose ether, the tensile adhesive strength of the tile adhesive after thermal aging increases, and the tensile adhesive strength after immersion in water first increases and then decreases. The effect is achieved when the cellulose ether content is about 0.3%;
Therefore, when using the redispersible latex powder and cellulose ether, pay attention to their dosage in order to truly play its role and cost effective.
The role of redispersible polymer powder in wall putty is mainly the following aspects
1, Improve the adhesion and mechanical properties of putty. Redispersible latex powder is a powder binder made from a special emulsion (high molecular polymer) spray-dried. This powder can be quickly re-dispersed into an emulsion after contact 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 the substrate. In addition, the water-repellent polymer powder can make the mortar have good water resistance.
2, Improve the cohesion of putty, good resistance, alkali resistance, abrasion resistance, and increase flexural strength.
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