This is a powder-defoaming agent specially designed for dry-mixed mortar products. It has a similar function to the liquid defoaming agent used in latex paint, and it plays the role of defoaming and foam suppression in dry-mixed mortar.
A dry powder defoaming agent is a non-ionic surfactant widely used in neutral and alkaline systems and is compatible with most other additives with good stability, strong defoaming, and anti-foaming functions.
During construction, air bubbles are often produced when the dry powder is mixed with water, affecting the product’s aesthetics. As dry powder coatings, pinholes will be produced after painting and spraying, and they will be distributed on the surface of the paint film like pockmarks. After the application of self-leveling mortar, the pores and bullet holes formed on the surface will affect the surface quality and aesthetics of the final product. Bubbles in the waterproof mortar may affect the impermeability of the mortar. Therefore, adding an appropriate amount of dry powder defoaming agent can effectively eliminate air bubbles and pinholes in dry-mixed mortar products and eliminate pores and cavities generated during pumping, scraping, and spraying without affecting the impermeability of the mortar. The primary function of the dry powder defoaming agent is defoaming and foam suppression, making the product more uniform and beautiful while improving the impermeability and strength of the product.
The general usage is between 0.2% and 0.5%.
1. Air-entraining agent
The air-entraining agent is a powdered anionic surfactant specially developed for applying cement-based and gypsum-based products. The use of air-entraining agents can introduce a large number of uniformly distributed, stable, and closed micro-bubbles into the product, which helps to reduce the surface tension of the water in the mortar, resulting in better wetting and dispersibility, improved workability, pump ability, and Freeze resistance.
2. In dry-mixed mortar products, air-entraining and wetting dispersants are usually used together to achieve the best effect. The air-entraining agent can be widely used in cement-based and gypsum-based plastering mortar, interior and exterior wall putty, masonry mortar, and self-leveling mortar to improve the constructability, smoothness, and plasticity of the product and is beneficial to the moistening of various pigments and fillers. At the same time, the air-entraining agent can improve the antifreeze performance of the product at low temperatures, enhance the impermeability of waterproof mortar, and reduce the bleeding of concrete and mortar. It can be used in lightweight aggregate mortar, ordinary mortar, and concrete, but it is unsuitable for steam-curing concrete and prestressed concrete products. The most commonly used air-entraining agents are a Rosin-based polymer, sodium alkylbenzene sulfonate, Lauryl sodium sulfate, and aliphatic alcohol sodium sulfate, soluble in water.
3. Main features
(1) Improve the durability of mortar and concrete. The frost resistance of mortar mixed with an air-entraining agent is several times higher than that of ordinary mortar.
(2) Increase the stability and viscosity of the mortar mixture, and reduce the occurrence of bleeding and segregation.
(3) The fine-grained part of the poorly graded sand can be compensated due to the air-entraining effect, thereby improving the quality of the mortar made with this sand.
(4) The mortar added with an air-entraining agent is easier to plaster.
(5) Reduce defects on the mortar surface, such as pockmarks and pits.
4. Usage
The general usage is between 0.005%-0.02%. Thixotropic lubricants enable the product to reduce flow resistance, obtain good lubricity and workability, improve thixotropy, sag resistance, and anti-sedimentation properties, and benefit the mixing and pumping of dry-mixed mortar products.
1. Thixotropic lubricant
Thixotropic lubricant is a pure inorganic flake silicate additive composed of countless nano-sized flakes with major positive and negative ions, which the surface of gypsum and cement particles can adsorb. When stirring with a specific shear force, these flakes form a lubricating layer to separate the particles so that the particles can move quickly without overcoming the high shear pressure between the particles.
Thixotropic lubricants are compatible with most additives, pigments, and fillers and are widely used in gypsum and cement plasters and putties, such as latex paints, self-leveling mortars, and other products.
Thixotropic lubricants are used in gypsum and cement plastering mortar and putty, which can improve the smoothness of the product surface, reduce adhesion, have excellent pump ability, reduce pumping loss and energy consumption, prolong available time, delay setting time, and increase lubricating properties.
Thixotropic lubricants are used in self-leveling mortar to prevent product delamination and sedimentation, to make the structure of the self-leveling system uniform, and to increase its surface strength simultaneously.
