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Help CenterHigh Strength Redispersible Polymer Powder Vae/Rdp for Skim Coat Dry Putty Powd
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With the increase of the content of redispersible emulsion powder/Rdp, the whole system develops in the direction of plastic. In the case of high emulsion powder content, the polymer phase in the cured mortar gradually exceeds the phase of the inorganic hydration product, the mortar has a qualitative change, and becomes an elastomer, while the hydration product of the cement becomes a "filler". The dispersed film of dispersible emulsion powder distributed on the interface plays another key role, that is, it enhances the adhesion of the contact material, which is good for some difficult surfaces, such as very low water absorption or non-water absorption surfaces (such as smooth concrete and cement material surface, steel plate, homogeneous brick, vitrified brick surface, etc.) and organic material surfaces (such as EPS board, plastic, etc.). It is especially important. Because the bonding of the mechanical adhesive to the material is achieved through the principle of mechanical embeddings, that is, the hydraulic slurry penetrates into the gap of other materials, gradually solidifies, and finally the mortar is attached to the surface of the material like the key embedded in the lock. For the above difficult surface, due to the inability to effectively penetrate into the material to form a good mechanical embeddings, The mortar with only inorganic adhesive is not effectively bonded to it, which is well proved by electron microscope observation. The bonding mechanism of polymers is different. Polymers are bonded to the surface of other materials by intermolecular force, and do not depend on the porosity of the surface (of course, the rough surface and the increased contact surface will improve the bonding force), which is more obvious in the case of organic substrates, and the electron microscope observation has also proved its superiority in the bonding force.
The role of Redispersible Polymer Powder RDP in mortar
Redispersible emulsion powder is mainly used in internal and external wall putty powder, tile binder, tile joint agent, dry powder interface agent, external wall insulation mortar, self-leveling mortar, repair mortar, decorative mortar, waterproof mortar external insulation dry mix mortar. The purpose of the mortar is to improve the weaknesses of traditional cement mortar such as brittleness and high elastic modulus, and to provide cement mortar with better flexibility and tensile bond strength to resist and delay the formation of cracks in cement mortar. Due to the interpenetrating network structure between polymer and mortar, a continuous polymer film is formed in the pores to strengthen the bond between aggregates. Some of the pores in the mortar are blocked, so the performance of the modified mortar after hardening is greatly improved than that of the cement mortar.
Redispersible Polymer Powder RDP is a thermoplastic material, it and inorganic cementing material constitute an ideal bonding system, each component brings its own properties and complement each other, together to form a cement and redispersible adhesive powder alone can not achieve the performance. The application of redispersible adhesive powder to mortar products can improve a variety of properties, such as: improve the bonding force; Improve cohesion; Reduce the elastic modulus; Increase flexural strength: increase flexure; Improve impact resistance; Improve wear resistance: reduce water absorption; Improve constructability: enhance durability; Improve water retention, etc.
The Redispersible Polymer Powder RDP can be quickly dispersed into an emulsion after contact with water, and has the same properties as the initial emulsion, that is, the water can be evaporated to form a film, which has high flexibility, high weather resistance and high adhesion to various substrates. In addition, the emulsion powder with hydrophobicity can make the mortar have good water resistance.
Redispersible emulsion powder is made of polymer emulsion by spray drying, mixed with water in the mortar, emulsified and dispersed in water, re-forming a stable polymerization emulsion, redispersible emulsion powder emulsified and dispersed in water, water evaporation, forming polymer film in the mortar, improving the performance of mortar, different redispersible emulsion powder has different effects on dry mortar.
RDP/Redispersible Polymer Powder is a thermoplastic resin powder prepared by spray drying polymer emulsion to remove water, and can be reduced to emulsion state after adding water. Due to this characteristic, it has been widely used in the fields where inorganic cementing materials need to be modified, such as single-component JS waterproof coating, polystyrene board bonding mortar for building insulation, flexible surface protection mortar, polystyrene particle insulation coating, ceramic tile bonding agent, self-leveling mortar, dry mix mortar, putty, etc. Redispersible emulsion powder can enhance the strength of the product, adding redispersible emulsion powder to the putty powder and mortar can increase its strength, and the improvement of hardness is very helpful. It has outstanding waterproof performance, good bond strength, can also increase the elasticity of mortar and have a long opening time, and give mortar excellent alkali resistance, can improve the mortar adhesion/adhesion, bending strength, wear resistance and constructability, in the flexible crack mortar has a stronger flexibility.
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