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DAPRO®

DF

21 & DF 52

New defoamers for clear wood coatings

Key Benefits

Excellent defoaming properties

Outstanding overall gloss performance particularly for clear wood coatings Suitable for wide range of applications

Application Leaflet

February 2014

2

Introduction

DAPRO® DF 21 is a mineral oil based hydrophobic silica containing emulsifier. This water dispersible

defoamer is suitable in high quality waterborne inks, adhesives and industrial coatings. DAPRO® DF 21 is

in particular very useful for glossy wood paints and clear acrylic coatings.

DAPRO® DF 52 is a mineral oil– free, hydrophobic silica defoamer and is suitable for wood coatings, flexo

-inks and paper coatings. DAPRO® DF 52 has excellent defoaming properties and is particularly suitable

for systems where mineral oils are unacceptable in chemical waste water.

Key Benefits


Outstanding gloss performance

Effective in wide range of applications

Particularly useful for glossy paints based on acrylic and PU chemistry.

Chemical and Physical Data

DAPRO® DF 21

DAPRO® DF 52

Incorporation

DAPRO® DF 21 and DF 52 show excellent compatibility and are suitable to use in the let down stage of sensitive coatings systems where optical properties are very important (e.g. gloss, transparency). A ladder study should be carried out to optimize the loading level.

Composition A blend of hydrophobic silica, emulsifiers and mineral oil

Colour/ Form Opaque off-white liquid

Level of use

Typically 0.1 – 1.0% on total weight, but should be optimized by testing a concentration ladder.

Storage and Transportation

Must be mixed prior to use

Under adequate storage conditions, DAPRO® DF 21 and DAPRO® DF 52 can be stored for at least 24 months in a non-opened container. Store between 10°C-35 °C (50°F - 95°F). If frozen thaw at room temperature and mix well. Detailed information on handling and safety can be found in the material safety data sheet. Handle in accordance with good industrial hygiene and safety practices.

Composition A blend of esters, hydropho-bic silica and emulsifiers

Colour/ Form Cloudy, light-amber liquid

3

Formulation and method

The Formulation

DAPRO® DF 21 and DF 52 were tested in three formulations with a special method.

The following formulations were used to test DAPRO® DF 21 and DF 52 regarding their defoaming behav-

iour and gloss and film appearance.

Acrylic clear coat based on NeoCryl XK 95

1 C High Performance wood clear coat, glossy, based on Alberdingk AC 2714 VP

2C High Performance PU-parquet lacquer, satin, based on Alberdingk U 9150

In each test series a formulation was used without a defoamer which represents the negative reference.

Acrylic Clear Coating

1 C High Performance Wood Clear Coat, Glossy

EP-111005_000

Test formulation Acrylic clear coat (defoamer testing)

Pos. Raw material Weight in % Function Supplier

Lay in Pos.1

1 NeoCryl XK 95 92.00 Resin NeoResins

Add Pos.2-6 under stirring in the denoted order

2 Additive X Defoamer Elementis Specialties

3 Ethyldiglycol 4.50 Org. solvent Fisher Chemicals

4 Dapro® W77 0.50 Anticratering Elementis Specialties

5 RHEOLATE® 299 0.35 Rheological additive Elementis Specialties

6 Demin-water 1.10 Diluent

Add Pos. 9+10 in the denoted order and stir it slightly for 10 min.

100.00

EP-122003_000

1 C High performance wood coating, Glossy (defoamer testing) based on Alberdingk AC 2714 VP pure acrylic


1 Alberdingk AC 2714 VP 83.00 Binder Alberdingk Boley


3 BYK 346 0.50 Substrate wetting BYK Chemie

4 Dowanol DPM 4.00 Coalescing agent DOW

5 Dowanol DPnB 5.00 Coalescing agent DOW

6 Water 5.90 Diluent

premix Pos. 4-6 before use

7 RHEOLATE

® 350 D 0.80 Rheological additive Elementis Specialites

Disperse Pos. 1-6 for 10 min. 6 m/s

100.00

4


2C High Performance PU-Parquet Lacquer, Satin

EP-122004_000

2 C High performance parquet lacquer, Satin (defoamer testing) based on solvent-free PU dispersion Alberdingk U9150


Component A

1 Alberdingk U9150 78.00 Binder Alberdingk Boley


3 Hydropalat 140 0.40 Wetting agent BASF

4 Acematt TS 100 1.00 Matting agent Evonik

5 Butylcarbitol 4.00 Solvent DOW

6 Water 16.00 Diluent

premix Pos. 5-6 before use

Disperse Pos. 1-6 for 10 min. 6 m/s

100.00

7 RHEOLATE® 350 D 0.80 Rheological additive Elementis Specialties

Component B

8 Easaqua XD 803 10.00 Hardener Vencorex

Slow stirring for 5 minutes

5

The Methods

To test DAPRO® DF 21 and DF 52 in three different formulations the following procedure was conducted:

first, 100 ml paint was put into a 250 ml glass jar. This dispersion was stirred for 5 minutes at 5,000 rpm

using a 3 cm toothed Cowles blade. After this process step, the height of head of foam as well as the

density was ascertained with a paint pycnometer Model 290/ IV (Volume + 50 ml) from Erichsen.

Film application test for parquet lacquers

Parquet lacquers were applied with a special parquet roller to the floor.

In order to simulate the daily process of application we

developed a special test method for evaluating applicabil-

ity and film behaviour for parquet lacquers.

A film was applied with a 250 µm blade on Leneta

charts.

A special sealing synthetic roller (5 mm microfiber)

was saturated with 30 gram paint.

Half of the draw down was rolled ten times to-and-

from to mimic practical application for flooring

systems.

After drying amount and size of the blisters were

visually evaluated.

Rating area: visually from “+++” to “- - -”

Gloss of the not rolled film was measured with a

haze-gloss meter from BykGardner.

( Units @ Angle 85 °)

Gloss was evaluated visually by comparison with the

negative reference.

Rating area: visually from “+++” to “- - -”

The picture illustrates the application of

a formulation with our DAPRO®

defoamer (left) and without defoamer

(right). As is clearly visible, bubbles

appear in the paint formulation without

a defoamer.

Defoaming performance test


6


Head of Foam Density Samples

% g/l After 24h

1 DAPRO® DF 21 0.25% 28.57 0.771 1.043

2 DAPRO®

DF 21 0.50% 28.57 0.813 1.041

3 DAPRO® DF 21 0.75% 25.71 0.831 1.041

4 DAPRO® DF 52 0.25% 25.71 0.863 1.042

5 DAPRO® DF 52 0.50% 14.29 0.919 1.042

6 DAPRO® DF 52 0.75% 11.29 0.832 1.043

7 Market benchmark 0.25% 31.43 0.698 1.043



10 Without defoamer — 134.29 0.428 1.046

The highest density which correlates with the best defoaming performance was obtained with a medium dosing level of 0.5 % DAPRO® DF 52.

1 C High Performance Acrylic Wood Clear Coat, Glossy

(Alberdingk AC 2714 VP)

The best defoaming performance was obtained with DAPRO® DF 21 and DAPRO® DF 52.

In the following practical examples, DAPRO® DF 21 and 52 were tested in different formulations on

its effectiveness in defoaming: Acrylic clear coat (NeoCryl XK 95, high viscosity), high performance

wood clear coat (Alberdingk AC 2714 VP, low viscosity), and a 2C High performance PU-parquet

lacquer (Alberdingk U9150). In these formulations DAPRO® DF 21 and DF 52 were tested against a

market benchmark.

Acrylic Clear Coat (NeoCryl XK 95)


% g/l After 24h

1 DAPRO® DF 21 0.25% 17.14 0.869 1.049

2 DAPRO® DF 21 0.50% 14.29 0.895 1.047

3 DAPRO® DF 21 0.75% 17.14 0.905 1.049

4 DAPRO® DF 52 0.25% 37.14 0.733 1.050

5 DAPRO® DF 52 0.50% 37.14 0.757 1.050

6 DAPRO® DF 52 0.75% 31.43 0.811 1.050





7


High Performance 2C PU-Parquet Lacquer, Satin (Alberdingk U9150)

The head of foam results were overall best for DAPRO® DF 21.


% g/l After 24h

1 DAPRO® DF 21 0.25% 44.86 0.933 1.034

2 DAPRO® DF 21 0.50% 11.43 0.948 1.033

3 DAPRO® DF 21 0.75% 14.29 0.938 1.031

4 DAPRO® DF 52 0.25% 20.00 0.871 1.030

5 DAPRO® DF 52 0.50% 22.86 0.894 1.030

6 DAPRO® DF 52 0.75% 14.29 0.924 1.032





8

Excellent gloss and film appearance

Acrylic Clear Coat (NeoCryl XK 95)

Systems with DAPRO® DF 21 provide surfaces with high gloss which can be measured with a BYK

– Gardner device. Visual rating distinguishes the systems better and highlights the excellent perfor-

mance of DAPRO® DF 21 .

The measured gloss results were similar, however the film appearance showed large advantages

for DAPRO® DF 21 and the market benchmark.

1C High Performance Acrylic Wood Clear Coat, Glossy

(Alberdingk AC 2714 VP)

Measured Visual [+ good, - poor] Samples

Gloss 250 µm,

leneta [85°]

Gloss Defoaming

1 DAPRO® DF 21 0.25% 95 ++ ++

2 DAPRO® DF 21 0.50% 93 ++ ++

3 DAPRO® DF 21 0.75% 97 ++ ++

4 DAPRO® DF 52 0.25% 95 + 0

5 DAPRO® DF 52 0.50% 93 + 0

6 DAPRO® DF 52 0.75% 95 + 0

7 Market benchmark 0.25% 96 + ++



10 Without defoamer — 92 ++ - - -


Gloss 250 µm,

leneta [85°]

Gloss Defoaming

1 DAPRO® DF 21 0.25% 94 ++ +

2 DAPRO® DF 21 0.50% 96 ++ +

3 DAPRO® DF 21 0.75% 95 ++ +

4 DAPRO® DF 52 0.25% 94 + -

5 DAPRO® DF 52 0.50% 94 + -

6 DAPRO® DF 52 0.75% 92 + -

7 Market benchmark 0.25% 96 ++ +



10 Without defoamer — 95 + - - -

9

Excellent gloss and film appearance

The good gloss and film appearance obtained with DAPRO® DF 21 and the market benchmark

were confirmed in this system as well.

Conclusion

Elementis UK Ltd

c/o Elementis GmbH

Stolberger Strasse 370

50933 Cologne, Germany

Tel: +49 221 2923 2066

Fax: +49 221 2923 2011

Elementis Specialties Asia

No. 99 Lian Yang Road

Songjiang Industrial Zone

Shanghai 201613

P.R. China

Tel: +86 21 57740348

Elementis Specialties, Inc.

469 Old Trenton Road

East Windsor, NJ 08512

USA

Tel: +1 609 443 2500

Fax: +1 609 443 2422

Learn more about our products

and visit our website!

www.elementis-specialties.com

or email us at:

[email protected]

High Performance 2C PU-Parquet Lacquer, Satin (Alberdingk U9150)

DAPRO® DF 21 has the best overall defoaming performance and gloss behaviour in all

systems. A good mineral oil-free alternative is the DAPRO® DF 52, which shows overall the

same gloss results, although foam reduction behaviour is a little less.


Gloss 250 µm,

leneta [85°]

Gloss Defoaming

1 DAPRO® DF 21 0.25% 93 + +

2 DAPRO® DF 21 0.50% 92 + +

3 DAPRO® DF 21 0.75% 89 + +

4 DAPRO® DF 52 0.25% 95 + 0

5 DAPRO® DF 52 0.50% 96 + 0

6 DAPRO® DF 52 0.75% 85 + 0

7 Market benchmark 0.25% 95 + +



10 Without defoamer — 94 + - -

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Performance comparison at 0.5% loading as delivered

Application foam

Gloss

Density

DAPRO®DF 21

DAPRO®DF 21

DAPRO®DF 21 DAPRO®

DF 52DAPRO®

DF 52

DAPRO®DF 52

MarketbenchmarkMarket

benchmark

Marketbenchmark

Acrylic Clear coat Acrylic wood clear coat 2 C PU parquet lacquer Neocryl XK 95 Alberdingk AC 2714VP Alberdingk U9150

Rating 1-5 per application property; 1= poor, 5= best

mailto:[email protected]

new defoamers for clear wood coatings - elementis … · wood clear coat (alberdingk ac 2714 vp,...

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