(evonik) novel water-borne sol-gel systems for metal treatment

8/10/2019 (Evonik) Novel Water-Borne Sol-Gel Systems for Metal Treatment

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Novel Water-BorneSol-Gel Systemsfor Metal Treatment

Ramon Sanchez-Morillo, PhD, MS

Piscataway Technology Center, NJ, USA

1-732-981-5329


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Adhesion Promotion with Silanes

O

Si O

Y = Organofunctional groupOR = Silicon-functional group

Y

Adhesion promotion effect

ORHO

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Ramon Sanchez Morillo, PhD 1-732-981-5329 [email protected] April 2010, AC Show

OOSiY

Polymer + Silane + Surface

SiY OR

OR

+HO

+


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Why Use Silanes forMetal Treatment?

Adhesion promoter for a

subsequent coating

R

OO

R SiSi

Si

O

SiO

R

OHO

O Si

Si

R

O

OOO

O

O

OO

O

O

O

O

R

Si

OO Si

Si Si

Si SiSi

Si

O

Si

Si

OO

R O ORO

OR

O

O

O

Si SiSi

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Passivation of metal surface due to reaction with substrate

Hydrophobic inner layer

Barrier layer for chlorideand waterMetal substrate

O

SiHO O

O

Si

R

O

O

O

OO

OSiSi

OO O


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New Silane Developments:Ever More Sophisticated

nn

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Sophistica

ti

Time

Sophistica

ti

Time


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Dynasylan SIVO 110Inorganic Resin with Inorganic Particles

Features:

High flashpoint(>95 C)

Compatible with water

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an po ar so ven s

Compatible withpolymer dispersions,e.g. acrylics

VOC content < 3wt.-%

Shelf life > 12 months

OH OH

OH


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Comparison

Steel,

spray galvanized

All panels have a 60-80 polyester powder coating on the surface

Sand blasted

steel, no primer

Sand blasted steel

with SIVOSOLTechnology

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500 hours saltspray test White rust

The SIVOSOL Technology can be used as an alternative to multilayerpowder coatings (~150-200) or zinc treatment.


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Typical Applications for theSIVOSOL Technology

Structural parts that are made of steel and are powder coated.

Examples:

City furniture:

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Park benches

Street lighting

Building faades

Decorative partsPicasso Center in Basel,

Switzerland


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SIVOSOL Technology:

Resin for the formulationof corrosion protectionsystem

Development of New Low-Temperature Curing Technology

DynasylanSIVO 160:

Resin for the formulationof corrosion protectionsystem

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Cured at hightemperature: 200 C for 10minutes

Excellent for theformulation of primers

below powder coatings

Cured at lowtemperature: 60 to 80 Cfor 10 minutes

Excellent for theformulation of primers

and blank corrosionprotection systems

New Silane Technology


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Water-borne

Nearly VOC free

Shelf life: 1 year

Key properties

DynasylanSIVO 160 A New Water-BorneLow Temperature Curing Sol-Gel System

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pH ~ 4,0 4,6

Solid content ~ 9 %

Colorless to yellow

liquid

Viscosity: 9 mPa s (20C)

Particle distribution of Dynasylan

SIVO 160Volumetric median particle size: 5,4

nm


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DynasylanSIVO 160 on Aluminium

Substrate

10 % aqueous solution of DynasylanSIVO 160 coates aluminiumsubstrate without defects.

aluminium substrate

SIVO 1601.Di in

Coated aluminium substrate

Layer thickness ~ 150 nm

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2.Curing 80 C

Investigation of the surface via XPS

Si* 0,89 19,6Al* 33,2 0,0

* [atom %]


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Corrosion Protection on Aluminum withEpoxy Powder Coating

500 h CASS

Blank Chromated SIVO 160

Substrate Aluminum (5005)

Degreasing / Cleaning Alkaline degreasing Alkaline etching (0,5 g/m2) Acid pickling

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Pre-treatment DynasylanSIVO 160 Pre-dried at 60 C, 10 minTopcoat

Epoxy powder coating, 60 Cured at 180 C, 20 min


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Corrosion Protection on Aluminum withAcrylic PU Coating

3000 h NSS

No Silane SIVO 160

Substrate Aluminum (2024T3Clad)

Degreasing / Cleaning Alkaline degreasing

Pre-treatment

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DynasylanSIVO 160

Pre-dried at 60 C, 10 min

Topcoat 2 parts PU paint, 60 Cured at RT for 2 weeks


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Corrosion Protection on Magnesium withPolyester Powder Coating

1000 h CASS

Blank Chromated SIVO 160

Substrate Magnesium (AZ31B)

Degreasing / Cleaning Alkaline degreasing

Pre-treatment

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Pre-dried at 60 C, 10 min

Topcoat Polyester powder coating,60

Cured at 180 C, 20 min

Dynasylan SIVO 160 works

best after alkaline degreasing


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Corrosion Protection on Passivated Hot-Dip Galvanized Steel

250 h salt spraySubstrate Hot dip galvanized steel withchemical passivation

Degreasing / Cleaning Ethyl acetate

HDG passivated SIVO 160

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Treatment Dipping in DynasylanSIVO 160formulation Cured at room temperature Layer thickness: ~ 1.0 m


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(evonik) novel water-borne sol-gel systems for metal treatment

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