Impact of Dispersant Technology on Dispersion Ease and ... · •Generally dispersants improve film...

May, 16th, 2012

Christian Beckers

Eckart & Valspar Meeting

Impact of Dispersant Technology on Dispersion Ease and Performance of Aluminum Effect Pigments

Jon Lawniczak – ECKART America

Coatings Trends & Technologies

Rosemont, IL Sept 10, 2019

Dispersant Study for Al Flakes

AGENDA

Issues with Poor Dispersion 1

Conclusions

2

3

Influences on Metallic Effect Pigments

• Coating Type & Chemistryo Water, Solvent, Solids, Rheology…….

• Pigment Shape or Type

o Cornflake, Silver Dollar, NDF & VMP

• Surface Treatmentso Encapsulation, Additives, Modifiers……

• Paint Application Methodo Bell, HVLP, E-Stat etc.

• Dispersant Used in Pre-dispersion

• Good orientation

• Uniform reflection

• Strong flop, high brilliance,

good hiding power

• Poor orientation

• Disordered reflection

• Weak flop,

"salt-and-pepper" effect

Flake OrientationPigment Orientation contributes highly on the “flop” effect of a paint.

The application conditions play a major role in creating the desire

“flop” characteristic

Dispersing Aluminum Pigment Pastes

Pre-dispersion of the flaky pigments is absolutely necessary!

mixing

1 part aluminium paste

1 - 2 parts solvent

0,5 – 1,0% wetting additives

on total formulation

Usually used solvents: aromatic hydrocarbons

aliphatic hydrocarbons

esters

ketones

alcoholes

Usually used wetting agents: Disperbyk 110

Disperbyk 163

avoid high shear forces

mixing

avoid high shear forces

Mixer / stirrer for dispersion in the lab

Improper dispersion; inhomogenous distribution of metal

flakes

(cross section picture):

perfect pigment predispersion

perfect pigment orientation

Aluminum flakes stick together

Aluminum flakes are aggregated

Poor orientation Good orientation

Pigment Orientation

Objectives of Study

• Determine how different

dispersant chemistries influence

effect pigment dispersion in

different applications.

• Determine effects on the

dispersion and the applied film.

Experimental Design

Resins Pigment Type Dispersant

2K PUR (force) Cornflake Fatty Acid

2K PUR (air) Silver Dollar Acid Ester

P’ester Melamine NDF Polyurethane

Acid EpoxyApplication:

• Spray applied / air dry

• Spray applied / force cure

• Drawdown (chart and coil)

Pigment Characteristics

Morphology

Non Degradable Flake (Thick)

Conventional (Corn Flake) Lenticular (Silver Dollar)

Ultra Thin (Vacuum Metalized Pigment)

Formulations

2K PUR Material wt %

Pre-disperse Acetone 7.5

PCBTF 2.7

Dispersant 0.8

Aluminum Paste 4.0

Joncryl 948 34.6

Joncryl 500 5.7

Garamite 1958 7% 20.3

PCBTF 8.1

Acetone 4.9

DBTDL Solution 1.8

Des N 3600 9.5

Coil Material wt %

Pre-disperse Aromatic 100 7

Dispersant 1.5

Aluminum paste 7

Dynapol LH 820-04 63.7

Cymel 303 13.7

BYK 3440 0.6

DEGBE 4.0

Aromatic 100 1.6

Dynapol Cat 1203 0.4

Formulations

Epoxy Material wt %

Epon 828 32.1

Epopn 8021 32.1

Dispersant 0.4

BYK 054 defoamer 0.3

Garamite 1958 0.2

Aluminum paste 7.2

EpiKure 3370 27.7

Coil Coating Panel Prep

Experimental Design - Responses

• Viscosity

• Orange peel

• Gloss

• Visual assessment

May, 16th, 2012

Christian Beckers


2K PUR – Mix Viscosity

Seconds, Zahn #3 (GE)

May, 16th, 2012

Christian Beckers


2K PUR Ambient Dry – Gloss, 60 deg

May, 16th, 2012

Christian Beckers


2K PUR(30 min @ 140F)– Gloss, 60 deg

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Christian Beckers


2K PUR Ambient Dry – Orange Peel, du

May, 16th, 2012

Christian Beckers


2K PUR(30 min @140F) – Orange Peel, du

May, 16th, 2012

Christian Beckers


2K PUR Ambient Dry – Flop Index

May, 16th, 2012

Christian Beckers


2K PUR Ambient Dry – L* 25

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Christian Beckers


Coil (90 sec @ 280C) – Gloss, 60 deg

May, 16th, 2012

Christian Beckers


Coil (90 sec @ 280C) – Orange Peel, du

May, 16th, 2012

Christian Beckers


Coil (90 sec @ 280C) – Flop Index

May, 16th, 2012

Christian Beckers


Coil (90 sec @ 280C) – L* 25

May, 16th, 2012

Christian Beckers


Epoxy – Gloss, 60 deg

May, 16th, 2012

Christian Beckers


Epoxy – L* 25

2K PUR - Force Dry

Pigment Type: Cornflake

No Dispersant Fatty Acid Acid Ester Polyurethane

2K PUR - Force Dry

Pigment Type: Silver Dollar

No Dispersant Fatty Acid Acid Ester Polyurethane

Epoxy Floor Coating

Additive Type: Fatty Acid

Cornflake Silver Dollar NDF

May, 16th, 2012

Christian Beckers


Conclusions

• Generally, dispersants help reduce viscosity in effect pigment-containing coatings.

• Generally dispersants improve film properties.

• Different flake geometries can respond differently to dispersants.

• Fatty acid types performed better with the 2K PUR but hurt gloss in the coil formulation.

• NDFs responded poorly to the acid ester in the 2K PUR.

Acknowledgements

- Scott Greer

- Ray Obryan

- Shannon Stevens

- Melinda Moeselin

Thank you for your attention

For More Information Contact Jon [email protected]

mailto:[email protected]

Impact of Dispersant Technology on Dispersion Ease and ... · •Generally dispersants improve film...

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