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Formulators can easily create waterborne coatings with standard additives, such as multi-substrate primers, wall paints, wood lacquers, stain and tannin blocking primers or primer and topcoat “2 in 1” systems.

ENCOR® 2793 has an excellent adhesion on wood, concrete, ceramic, plastics and many other substrates. It is outstanding for stain and tannin blocking. It even prevents the knots of the wood, such as pine, from bleeding and blistering.

Performance benefits

Easy to formulate into waterborne coatings with standard additives

  • Outstanding adhesion on many substrates
  • Stain blocking, tannin blocking, knot blocking
  • APEO- and formaldehyde releaser-free

Typical properties1

Total solids, % by weight 43
pH value 9.0
Average particle size, nm 100
Viscosity at 23°C, mPa.s
(Brookfield RVT, 20rpm)
1000 max
Minimum filming temperature (MFFT), °C 15

1 Typical values not to be considered as sales specifications.

Easy to formulate

ENCOR 2793 optimizes adhesion and stain-blocking performance as an all-in-one binder for coating formulations. In the table below, we propose two paint formulation guidelines with ENCOR 2793 with standard additives.

 

Ingredients Paint
PVC 40%
Paint
PVC 25%
ENCOR® 2793 45 63
Coalescent 0.9 1.2
Dispersant, such as
Coadis 790

1.4

1.0
TiO2 20 20
Fillers 18 9
Defoamer 0.2 0.2
Biocides 0.2 0.2
Thickeners, such as
Coapur 830 W
Coapur 2025

0.2
1.7

-
0.8
Water 12.4 4.6
Total 100 100

Adhesion performance

We can find many different substrates in our houses. Waterborne binders can have difficulties with good adhesion on flat surfaces, such as plastics, ceramics, metals, etc. ENCOR® 2793 enables the formulation of one coating that has a durable adhesion on virtually any substrates that can be found in our house.

Test: Adhesion cross-test according to ISO 2409

Test conditions:

  1. One layer of paint is applied to the substrates at 200µm wet thickness
  2. After the required drying time, a grid is cut on the surface of the coating
  3. An adhesive tape is applied and pulled

In Table 1, we observe the result of the test ISO 2409 performed with a paint formulated with ENCOR® 2793 at PVC 40%.

Quotation: 0 = perfect adhesion to 5 = no adhesion

Table 1

Result of the adhesion test, ISO 2409, with ENCOR® 2793 formulated in the paint at PVC 40%.

  Time after application ENCOR® 2793 in paint PVC 40%
PVC 24h 0
  28 days 0
Glass 24h 1
  28 days 1
Tiles 24h 1
  28 days 0
Copper 24h 1
  28 days 0
Aluminum 24h 1
  28 days 0

Tannin blocking

Some wood species like pine and oak are difficult to cover with waterborne coatings because they contain tannins. Tannins are hydrophilic molecules that can migrate in such coatings, leading to their coloration. ENCOR® 2793 interacts with tannins and prevents the wood substrates from bleeding.

The picture below represents the blocking mechanism of paint with ENCOR® 2793. Two coats are applied on a tannin-rich wood (i.e. pine, oak, Merbau, etc.). The first coat blocks the majority of the tannins. The second coat acts as a topcoat and blocks the last molecules.

arkema-acr-tannin-blocking.gif

 

Test: Tannin blocking (internal method)

Test conditions:

 

  1. Two layers of the paint are applied on a Merbau panel at 150g/m² (24h between the two coats)
  2. 24h after the second layer the panel is put in a climatic chamber for two weeks
    Aging cycle: 12h at 90% relative humidity and 40°C / 12h at 35% relative humidity and 40°C
  3. dE is measured (reference: paint applied on a Leneta card 2A)

Merbau wood

Merbau wood is an exotic wood with a very high concentration of tannins.

The pictures below show the Merbau wood panel and the results after performing the test conditions with a paint with ENCOR® 2793 at PVC 25% and a standard acrylic satin paint. We observe the results of the test with one layer and with two layers of paint.

encor-2793-tannin-blocking.png

Knot blocking

Test: Knot blocking (internal method)

Test conditions:

  1. A pinewood panel with a visible knot is selected
  2. Two layers of the same paint are applied on the panel at 150g/m² (24h between the two coats)
  3. The coated panel is dried under 23°C / 50% relative humidity for 7 days
  4. Once dried the panel is put in the QUVA condensation test chamber for 1 week
  5.  

We observe the general aspect of the coating after the QUVA condensation test. The pictures below shows the pinewood panel with its knot and the results after performing the test.

Stain blocking

Test: Stain blocking

Test conditions:

  1. A substrate (for example, a filter), is stained
  2. Two layers of the same paint are applied at 150 g/m² on the stained filter, 24h drying between the layers
  3. After 24 hours drying time at 23°C / 50% relative humidity, the dE is measured on top of the stained coating (reference: paint applied on a Leneta card 2A)

Table 2 gives the measure of the dE as explained in the test conditions.

Table 2

Stain blocking test results.

Stain dE
Nicotine     1.0    
Red wine 0.4
Permanent marker 0.5
Blue ink 0.3
Yellow stabilo  1.1

 

Contact

Chantal ROIDOT

Global Marketing & Business Development Manager