New pigments for a bright future...Adhesion binder – pigment < Cohesion binder • Pull off test...

European Coating Conference Düsseldorf, Germany

Dr. Andreas Götz 12.09. 2013

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New pigments for a bright future Dr. Andreas Götz, Ziegler & Co GmbH, Germany



Page 2

Outline

• Micaceous Iron Oxide in Anti Corrosive Systems

• Alternative Pigments – Muscovite Mica – Boruvit

• Formulation

• Test Results

• Conclusions



Page 3

Micaceous Iron Oxide (MIO)



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Taken From: Nutzbare Gesteine und Mineralien des Königreichs Bayerns, 1896



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Modern Anti Corrosive Painting Systems

• BASt TL/TP-KOR-Stahlbauten e.g. Anhang E, Blatt 87 - Priming coat: Epoxi ground layer with Zn-Phosphate or

Zn-dust - Intermediate coat: Epoxisystem, > 75 % Micaceous

Iron Oxide - Finishing coat: PUR with > 65 % Micaceous Iron Oxide



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Anti Corrosive Effects of Micaceous Iron Oxide

• Passive Anti Corrosive Pigment

• Overlapping and interleaving multi layer structures of pigment platelets

• “Scale-Armour“ Paint – Lamellas form Armour – Increase of diffusion times

Wikipedia.org



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„Scale Armour-Effect“

Gessner, 1999



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Anti Corrosive Effects of Micaceous Iron Oxide

• Passive Anti Corrosive Pigment • „Scale-Armour Effect“

– Lamellas form Armour – Increase of diffusion times

• UV-Protection – Decomposition of binder matrix is reduced

• Stress relaxation



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Pecularities of Micaceous Iron Oxide

• Strong colour – Colour Scale limited („DB“-Farben) – Repair / reworkability low

• High density – sedimentation problems

• Highly abrasive – problems for spray application

• Limited deposits / resources



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Outline



• Formulation

• Test Results

• Conclusions



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Muscovite Mica

- Lamellar Strucutre - High Whiteness - Transparent in formulation

- MicaCelia 90L

MIO Muscovite

Lamellar Thickness

AFM 1,5 – 4 µm 0,5 – 2 µm

Theor. Aspect ratio

1:2 - 1:5 1:5 - 1:15

Lamellarity Factor

1 > 2,2



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Boruvit

- Borosilicate glass powder - Transparent in formulation - Sustainable – recycling product - UV-absorber - No sharp edges

- Boruvit B140

soleni.de



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Comment MIO MicaCelia 90L Boruvit B140

Oil absorption (linseed oil ml/10g)

DIN EN ISO 787-5 15 79 29

Formulation wt.-% relative to Micacaeous Iron Oxide

modification of guidelines BASt

Blatt 87 100% 19% 50%

pH-value DIN EN ISO 787-9 9,4 9,2 8,7 Colour Minolta CM-2600d Whiteness (%) 15,6 66,1 88,6 L*, a*, b* 45,6, -1,25, -1,64 87,2, 0,02, 4,45 96,2, 0,01, 0,87 Lasergranulometry Cilas 920L D90, D50, D10 (µm) 101, 59, 26 82, 41, 12 44, 17, 3 electr. conductivity (µS/cm)

DIN EN ISO 787-14 50 85 95

input of free salts relativ to Micaceous Iron Oxide

calculated from electric conductivity

100% 32% 95%

Moh's Hardness ca. 6 2 - 3 ca. 6 apparent density (g/l) DIN 53466 2300 330 700 true density (g/cm³) 4,9 2,7 2,25 lamellar thickness (µm) AFM 1,5 - 4 0,5-2 not lamellar Aspect ratio 1:2 - 1:5 1:5 - 1:15 1 Lamellarity Factor 1 > 2,2 not lamellar



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Outline



• Formulation

• Test Results

• Conclusions



Page 15 BASt, TL/TP-KOR-Stahlbauten, Anhang E, Blatt 87



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Formulation

• Exchange of MIO by Oil Absorption – 100 wt.-% Micaceous Iron Oxide – 19 wt.-% Muscovite Mica – 50 wt.-% Boruvit

MIO Muscovite

Mica Boruvit

electr. conductivity (µS/cm)

DIN EN ISO 787-14 50 85 95

input of free salts (relative to Micaceous Iron Oxide)

calculated from electric

conductivity 100% 32% 95%



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Outline



• Formulation

• Test Results

• Conclusions



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Corrosion Tests

• Tests were performed with with triple determination – in our laboratory – Institute for Corrosion protection (IKS) Dresden (acredited

laboratory)

• Continuous condensation (ISO 6270-1) • Resistance to salt spray (fog, DIN EN 7253) • discontinuous condensation (ISO 6270-2) • Cross-cut test (ISO 2409) • Pull-of test (ISO 4624)

• All systems passed the tests at the IKS Dresden !*

• Bubbles and rust grade in all samples 0

* Specification of the composition not fullfilled for Mica due to low density.



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Some Specimens – Salt spray test

MIO Boruvit Muscovite Mica



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Some Specimens – Composite 2

MIO Boruvit Muscovite Mica



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Corrosion Protection by Stress Relaxation

• Fractures in binder Shorter diffusion length for corrosion stimulants • No Fractures form when Adhesion binder – pigment < Cohesion binder

• Pull off test ISO 4624



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Abrasion in Spray Application

• Micaceous Iron Oxide is highly abrasive • High wear of spray nozzles and pumps

Area increase after 8 h of spraying

before MIO 59 %

Boruvit 3 % Muscovite Mica 0 %



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Color Spectra

bernies-gallery.de



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Conclusions I

• The alternative pigments Boruvit and muscovite mica reach at least comparable anti-corrosive properties as MIO

• The alternative pigments fullfill the strict requirements of the BASt, Blatt 87 regarding anti corrosion effect, the performance was officially tested and confirmed by IKS Dresden

• Boruvit is a recycling-product with high UV absorption

• Muscovite Mica has a higher lamellarity as Micaceous Iron Oxide and reduces input of free salts



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Conclusions II

• The alternative pigments open a wide colour spectrum • They minimize abrasive wear during spray application

and lower application cost • Independent of application way optically uniform results

are achieved • Lower density lead to higher spreading rate and lower

consumption • Less sedimentation of paints makes the workability

better



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Thank you for your kind attention !

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