Emulsion Polymers Selection for Adhesives and Sealants

VAE Redispersible Powders (RDPs) and Their Applications in Building and Construction

Vinyl acetate-co-ethylene copolymers (VAE), available from Gantrade Corporation and Dairen Chemical Corp. in powder form, are white, free-flowing, dry powders that are readily redispersed into water to re-form a stable emulsion. Sometimes called "solid latex," VAE redispersible powders (RDPs) are easy to ship, store (excellent storage stability), handle, and dry-mix versus VAEs in an emulsion form. VAEs account for the majority of the global market for redispersible polymer powders.

Dry mixing with other powders such as cement, sand, or light aggregate at a field site or manufacturing location can facilitate consistency and reliable performance. VAE-RDPs are used as cement and plaster modifiers or as a binder resin for inorganic materials such as gypsum and hydrated lime. Formulators also use VAE-RDPs as the sole binder resin for construction adhesives.

The advantages of incorporating VAE-RDPs in dry-mix formulations include improvements in workability and water retention, plasticity, dispersion, and freeze stability. The VAE resins are soft and flexible because of their relatively high ethylene contents. As a modifier, VAE-RDPs improve flex strength, crack resistance, adhesion, abrasion and impact resistance, and water repellency.

Applications for VAE-RDPs include the formulation of construction materials such as tile adhesives, grouts, finishing plasters, troweling compounds, thin set mortars, and sealing slurries. The amount of VAE-RDPs added to cements and plaster is about 2-10 percent, depending on the improvement of strength, impact resistance, adhesion, and water resistance required of the compound.

VAE-RDP: Manufacturing Process

Vinyl acetate and ethylene are copolymerized in an emulsion process to first produce VAE compositions containing between 10 and 40 percent ethylene in the copolymer. Ethylene is a soft, hydrophobic monomer unit in the copolymers, functioning as an internal “plasticizing” moiety. In copolymers, ethylene effectively reduces the glass transition temperature (Tg) of the hard, polar vinyl acetate monomer, which has a Tg of 30 °C. Thus, we can achieve copolymers with Tgs ranging from +15 °C to minus 15 °C while converting the base emulsion resins used in the production of the VAE into redispersible powders. By using ethylene monomer to adjust the Tg, the formulator does not require any external plasticizers.

We’ve depicted the manufacturing process for redispersible powders below. Starting with a VAE emulsion produced using a colloid stabilizer like polyvinyl alcohol, the emulsion is mixed with a fine mineral anti-caking agent and then spray-dried. This affords a stable, free-flowing powder which can be redispersed when mixed with water. The RDP’s minimum solid’s content is 98 percent; the level of anti-caking agent content is up to 8-12 percent of the total weight. These VAE’s have very low amounts of volatile organic compounds (VOCs) and low odor levels.

Recent Insights and Market Trends

Recent reports indicate an increasing demand for eco-friendly and high-performance adhesive solutions, which has further pushed the adoption of VAE-RDPs in various construction applications. A report published within the last week on vae powder supplier highlighted the value of VAE-RDPs in enhancing the mechanical properties and durability of modern building materials.

Additionally, there is a growing trend towards using green building standards and sustainable construction practices. This has led to greater emphasis on the use of materials that are environmentally friendly, have low emissions, and provide superior performance characteristics, aligning perfectly with the attributes of VAE-RDPs.

VAE-RDP Grades, Properties and Applications

We can segregate the grades and general applications of the VAE-RDPs by glass transition temperature (Tg). The Tg of an amorphous polymer like VAE is the critical temperature at which the material changes its behavior from being a glassy solid to a rubber material. When the ambient temperature is above the Tg, the polymer becomes a rubber. When the ambient temperature is less than the Tg, the polymer becomes a glassy material.

In the series of VAE-RDPs, the grades range from low Tg soft materials (DA 1400 series) to medium Tg flexible materials (DA-1200 series) to high Tg harder materials (DA 1100 series).

Special Grade

The dominant market for VAE RDPs is in the building and construction industry, where they are used to formulate dry-mix products. The global market for these types of products is projected to grow at more than seven percent annually, supported by technological developments in the field of thin-bed tile adhesives. For wall tile adhesive applications, VAE-RDPs improve slump property, water retention, and workability. This allows tiles to be laid from the top to the bottom without experiencing tile slippage or the need to use spacers. VAE-RDPs also improve the leveling properties of tile adhesives and other cementitious materials.

Demand for VAE-RDPs has also grown into the area of skim-coat compounds, where VAE contributes increased wall adhesion and crack-bridging properties.

We have provided the recommended grades of Dairen’s VAE redispersible powders for various building and construction application applications in the chart below.

Selection Guide for VAE-RDP Grade in Construction Products Applications

Grades
Tile Adhesives
Sealing Slurry
Repair Mortars
Troweling Compounds
Self-Leveling Compounds
Thermal Insulating System
Mineral Plasters
Gypsum-based Compounds
Cementitious Wood Adhesives

DA-1100
•
 
•
•
DA-1120
•
•
•
•
•

DA-1130
•
•
•
•
•
•
DA-1200
•
•
•
•
•
•
DA-1210
•
•
•
•
•

DA-1220
•
•
•
•
•
•
DA-1400
•
•
•
•
•
•
DA-1410
•
•
•
•
•

DA-1420
•
•
•
•
•
•
DA-1430
•
•
•
•
•
•
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DA-1450

Edge Banding - Everything You Need To Know

Sales Specifications

We have delineated the sales specifications for various grades of VAE-RDPs available from Gantrade and Dairen Chemical below.

Specification of VAE Redispersible Powder

Grade
Polymer Type
Protective Colloid
Solid Content* wt%
Ash Content* wt%
Bulk Density g/ml
Average Particle Size um
50% Redispersion
Viscosity cP 25 °C 10rpm
pH
Tg* (Onset, °C)

DA-1100
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
15 ±3

DA-1120
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
--
7
15 ±3

DA-1122
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
--
--
15 ±3

DA-1130
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
--
7
15 ±3

DA-1133
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
--
7
15 ±3

DA-1141
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
500
7
15 ±5

DA-1200
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
0 ±3

DA-1210
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
0 ±3

DA-1220
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
0 ±3

DA-1400
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
-15 ±5

DA-1410
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
-15 ±5

DA-1420
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
-15 ±5

DA-1430
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
-15 ±5

DA-1450
VAE
White Powder
PVA
99 ±1
10 ±2
0.5
90
2000
7
-15 ±5

DA-3510
VAE
White Powder
PVA
99 ±1
10 ±2
0.45
95
--
10
-15 ±5

The redispersible powders are available from Gantrade Corporation in 25 kilogram multi-layer paper bags with an inner plastic bag. We have packaged the 25 kg bags in 450 kg. carton boxes containing 18 units. Flexible jumbo bags are also available in both 550 kg. and 600 kg sizes within a carton box. VAE RDPs absorb moisture and should be stored under dry and cool conditions to prevent caking.

We designed this article to help those looking to select the right VAE-RDP for enhancing your specific adhesive, construction compounds, or cementitious products. Gantrade’s professional staff is ready to assist with your selection, ensuring that you match the right VAE-RDP to the performance requirements of your application. Get in touch today!

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