After dry-mixed mortar added with redispersible polymer powder is mixed with water, the modification of redispersible polymer powder on cement mortar is accomplished by redispersion of powder, hydration of cement and film formation of polymer. The film forming process of redispersible latex powder in mortar can be divided into three stages.

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In Stage One, after mortar is stirred with water, polymer powder will be redispersed uniformly into the fresh cement mortar and emulsified again. During the stirring process, powder particles themselves will then be dispersed throughout the fresh mortar, but will not be agglomerated with cement particles. The &#;lubricating effect&#; of redispersible polymer powder particle enables the mortar mixture to have good construction performance; its air-entraining effect makes mortar compressible and thus easier for construction work. Protective colloids play an important role during the process in which polymer powder is dispersed into fresh cement mortar. The strong hydrophilicity of protective colloid itself gets the redispersible polymer powder to be completely dissolved at low shear forces, thus releasing the initial dispersed particles without changes in nature, and thereby polymer powder can be redispersed. Rapid redispersion in water is a key performance that maximizes the effect of polymer.

 

In Stage Two, cement hydration, surface evaporation and base absorption will result in constant consumption of free water in the mortar internal pores. The movement of polymer particles will naturally get increasingly restricted. The interfacial tension between water and air makes them gradually arranged in the capillary pores of cement mortar or in the mortar-base interface region. With the mutual contact of polymer powders, the network-like moisture between particles will evaporate by the capillary. The resulting high capillary tension will be applied to the surface of polymer particles, causing deformation of polymer sphere and making them fused together. At this time, the polymer film is roughly formed.

 

In Stage Three, through the diffusion of polymer molecules, polymer powders form a water-insoluble continuous film in the mortar, thereby improving the bonding with interface and the modification on mortar itself.

Redispersible Polymer Powder (RDP Chemical)

RDP powder, i.e Redispersible Polymer Powder, is a water soluble polymer made from ethylene-vinyl acetate (EVA) polymer through spray drying, it's designed for the construction industry to enhance the properties of dry mortar blends.

RDP powder is always combined with cellulose ethers and other additives to improve the properties and performance for the cement based or gypsum based mortar, such as better water-retention,open time,better work-ability, increasing adhesion to a variety of substrate and higher flexural strength and flexibility etc..

Its technical ability to increase the cohesiveness, flexibility, bond strength and most importantly the water proofing property, form a film with high tensile strength and bonding strength on different substrates. 

Specifications of 

RDP Chemical

 

Item

Type Specification of RDP Chemical Powder

RDP

KD N

RDP

KD N

RDP

KD N

RDP

KD H

RDP

KD N

RDP

KD L

Appearance

White flowing powder

Polymer Type

Vinyl Acetate-Ethylene copolymer

Protective Colloid

Polyvinyl Alcohol

Solids content (%)

98 min

Bulk density

400&#;550 g/l

Particle Size

80μm

PH

5.0-8.0

Viscosity

0.5-2.0

Ash content (%)

12±2

MFFT (&#;)

4

1

0

0

4

4

* Viscosity: 50% water Solution at 25 &#; (PaS)

 

Applications of 

RDP Chemical Powder

Applications

RDP

KD N

RDP

KD N

RDP

KD N

RDP

KD H

RDP

KD N

RDP

KD L

Wall Putty/Skim Coat

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Tile Adhesives

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Cement-Based Plasters/Render

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Tile Grouts/Joint Filler

 

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Repair Mortar/Crack Filler

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External insulation and finish systems (EIFS)

 

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Self-leveling Compounds

 

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Masonry Mortar

 

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Waterproofing Mortar

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Properties of RDP Chemical Powder

&#; Increase adhesive/cohesive strength

&#; Higher flexural strength

&#; Excellent rheology

&#; Improved workability

&#; Great durability and abrasion resistance

&#; Improved water retention capability and open time

&#; Water resistance and low water uptake

 

As a leading RDP Powder manufacturer and supplier, we would like to share further information you need on RDP powder. If you have any questions on Redispersible Polymer Powder chemical powder or wanna get free quotation of Redispersible Polymer Powder, please feel free contact us at any time.

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