Solyfast is a novel light-triggered tin-free metal catalyst that enables fast curing of 2K-PUR coatings at room temperature. It provides coatings with a long pot-life of over 1 hour while still allowing rapid curing upon exposure to UV light. This offers benefits like reduced energy costs compared to traditional thermal curing and less waste from shorter production times. Testing showed Solyfast achieved fast curing of both clear and pigmented 2K-PUR coatings upon low-dose UV activation, with catalytic activity dependent on the UV dose applied.

1. Novel Light-triggered
Tin Free Metal Catalyst
for fast curing of 2K-PUR Coatings
SolyfastTM
Dr. Antoine Carroy
BASF SE
ED/DC - Global Product Development Curing Technologies

2. Video
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3. Agenda
 Introduction: why a Photo-Latent Catalyst ?
 Photo-Latent Metal Catalyst for 2K-PUR Coatings  Solyfast®
 Concept
 Light activation & tests
 Some application data
 Summary
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4. Photo-Latent Metal Catalyst... why?
1. Fast curing of applied 2K-PUR coating at RT 2. Long pot-life, i.e. >>1hr. (ideally up to 6hrs.)
 Reduced energy consumption:  Reduced paint waste
RT vs. 60-80°C
 More flexible process timing
– Address issue of heating very large objects,
heat-sensitive parts, or heavy metal structures
3. Organotin free compound
 Increased through-put
– Short time to dust-free
– Short time to handling/moving of coated object
Proposed Solution = non-Sn metal catalyst triggered by UV-light, thus activated at RT
+ when desired (“cure-on-demand”).
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5. Applications
Coatings Market for 2K-PUR Global
Large objects Heat sensitive
~17,000 kT substrates
 Low temperature
processing
Car Parts
3C & Household  Need to reduce cycle
4%
Refinish 8% and storage times
2%
Aerospace
26% 0%
14% ACE
15% 7%
Auto 7% 2%
OEM 13% Wind Power
General
F&F
Industry
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6. Concept:
RT Curing of 2K-PUR with UV-light triggered Catalyst
Poly-NCO Polyol
(e.g. Basonat®) (e.g. Joncryl®)
catalyst
Non-latent Catalyst Photo-Latent Metal Catalyst
(e.g. DBTL) (SolyfastTM)
Mixing
Short Longer PLMeCat
Pot-life Pot-life
2K-PUR Coating No/low activity
<< 1hr. 3-6hrs.
(+ catalyst)
Fast curing requires UV@RT
thermal energy !
Fast Me Cat
Coating
~ 30 min. Curing
@ 60-80°C @ RT High catalytic activity at room
temperature
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7. Photo-Latent Metal Catalyst
 SolyfastTM
 Supply forms & properties:
SolyfastTM 0010 SolyfastTM 0012BA
100% Solids content 20%
- Butylacetate 80%
~ 9.0% Metal (non-tin) ~ 1.8%
White crystals Aspect Clear v. pale yellow solution
 AMES test: negative!  non-mutagenic
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8. UV-Absorption Spectrum of SolyfastTM
0,8
0,05%
0,00% UV-LED
Absorption
0,6 UV-A
0,4 UV-B
0,2
UV-C
0
200 250 300 350 400 450
Wavelength (nm)
Fe Hg Ga
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9. Lab Set-up for UV-A Activation of SolyfastTM
UV-A Lamp
(450W)
Empty drum UV-F450 “Flood Lamp” HB-404
(for stand-by (Panacol-Elosol) (Philips)
position of the
running lamp) Coated panel UV-A Screening effect of black filter
Fe
Substrate holder
(adjustable distance)
Drum 1 Drum 2
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10. UV-Lamps Output: UV-Dose (J/cm²)
Influence of Distance, Power, ...
UVC UVC
UV-Dose (J/cm²)
UV-Dose (J/cm²)
6
UVB 6 UVB
5 UVA UVA
5
4
4
3
3
2
(80% power)
exposure
2
3 m/min.
2 min.
1
1
0
0
20cm
F450
HB-404
20cm
HB-404
HB-404 10cm
10cm
D-bulb Fusion
UV-F450 “Flood Lamp”
(Panacol-Elosol) HB-404 (Philips)
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11. UV-Lamps Output:
Dose (J/cm²) vs. Intensity (W/cm2)
UVC UVC
UV-Dose (J/cm²)
UV-Intensity (W/cm²)
6 UVB 6 UVB
UVA UVA
5 5
4 4
3 3
2 2
1 1
0 0
HB-404 10cm HB-404 10cm
2 min. D-bulb Fusion D-bulb Fusion
2 min.
exposure 3 m/min. exposure 3 m/min.
(80% power) (80% power)
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12. Monitoring of 2K-PUR Curing:
“Sand Test”
3
4
2
t=0
1
Surface-cure
(tack-free)
sand dry
Through-cure
(scratch-free)
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13. Monitoring of 2K-PUR Curing:
FTIR Analysis  % NCO
BaF2 crystal
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14. SolyfastTM Catalytic Activity
in a model 2K-PUR Clear Coat
Component A (Polyol)
Polyacrylatol (Joncryl® 507, BASF) 53,1
Leveling additive (Efka® 3030, BASF) 0,6
Butyl-acetate 26,3
Component B (Polyisocyanate)
HDI-Isocyanurate (Basonat® HI 2000, BASF) 19,6
Catalyst
SolyfastTM 0012BA 0,4
~62% solids | 20sec.DIN cup 4 | NCO/OH ~1,0
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15. SolyfastTM Catalytic Activity
Benchmark in model 2K-PUR Clear Coat
>24hr. DFT : ~50µm
Sand test drying time (hr.)
8
6
4
2
0 Through Cure
No cat Surface Cure
DBTL
(0,0095%) Solyfast
(0,080%) no UV Solyfast (0,080%)
+ UV-A (~3J/cm²)
Solyfast = SolyfastTM 0010
Catalyst (solid) concentration: in wt.% on total formulation
Comparison at same pot-life ~ 3hrs. & at room temperature curing
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16. SolyfastTM Activity in 2K-PUR Clear Coat
Influence of UV Activation
SolyfastTM 0010 at 0.044wt.% on total formula based on Joncryl® 507 and Basonat® HI-2000.
Activation under „UV-F450“ Activation under „HB-404“
>24hr. Surface Cure >24hr. Surface Cure
Sand test drying time (hr.)
Sand test drying time (hr.)
Through Cure Through Cure
20 20
15 15
10 10
5 5
0 0
No Cat 0 No Cat 0
~0.7 ~1
~1,3 ~2
~4 ~5
UV-A dose (J/cm²) UV-A dose (J/cm²)
(only 63ppm Me on resins solids)
Higher UV-dose  higher activity of SolyfastTM, thus faster curing
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17. SolyfastTM and Pot-Life
Example in one model 2K-PUR Clear
2K-PUR clear coat based on Joncryl® 507 and mixed x-linkers, i.e. HDI-trimer + IPDI-allophanate
Pot-life: Viscosity Increase
DBTL (0,025%)
Viscosity ZnOct (0,126%) Solyfast = SolyfastTM 0010
(mPa.s)
Solyfast (0,172%) Catalyst (solid) concentration: in wt.%
1400 Solyfast+PDO (80/20) on total formulation
1200
1000
800 Very slow curing
600
even 30’@60°C
400
200
0
0 1 2 3 4 5 6
Time (hr.) after mixing Comp. A + Comp. B “PDO” = 2,4-pentanedione
or acetyl-acetone
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18. SolyfastTM with HDI based Polyisocyanates:
UV Activation & NCO Conversion
SolyfastTM 0010 at 0.16wt.% on total formula based on Joncryl® 507 and various Basonat®:
tests done with blend SolyfastTM/PDO (80/20)
No light activation Activation under „HB-404“ (~3J/cm²)
Unreacted NCO (%) HI-100 HA-1000 Unreacted NCO (%) HI-100 HA-1000
HB-100 HI-2000 HB-100 HI-2000
100 100
80 80
60 60
40 40
20 20
0 0
t=0 No 1hr. 2hr. 3hr. 4hr. 5hr. 6hr. 7hr. 8hr. t = 0 After 1hr. 2hr. 3hr. 4hr. 5hr. 6hr. 7hr. 8hr. 24hr.
UV UV
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19. SolyfastTM with HDI based Polyisocyanates:
UV Activation & Solvent resistance development
SolyfastTM 0010 at 0.16wt.% on total formula based on Joncryl® 507 and various Basonat®:
tests done with blend SolyfastTM/PDO (80/20)
No light activation Activation under „HB-404“ (~3J/cm²)
Acetone double-rubs Acetone double-rubs
100 100
80 80
60 60
40 40
20 20
HI-2000 HI-2000
0 HB-100 0 HB-100
HA-1000 HA-1000
1hr. 2hr. HI-100 1hr. 2hr. HI-100
4hr. 7hr. 4hr. 7hr.
24hr. 24hr.
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20. SolyfastTM Activity in Pigmented 2K-PUR
Benchmark in White Coating
2K-PUR white (~45wt.% TiO2 on resin solids) based on Joncryl® 507 and Basonat® HI-100
DBTL @RT SolyfastTM 0010 (0,045%) @RT
No Cat @RT
(0,018%) No UV ~3J/cm² UVA
DFT : ~50µm
RT = room temperature
Catalyst (solid) concentration: in wt.% on total formulation
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21. Summary
SolyfastTM
is the first light-triggered metal catalyst for curing 2K-PUR coatings, offering:
 Increase in through-put  fast curing
 Reduced waste  longer pot-life
 Cost savings, e.g. lower energy, reduced floor and storage space, ...  room temperature,
UV instead of heat & fast curing
 Healthier working environment  Sn free
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22. Contact Info:
• Technical:
 Antoine Carroy, antoine.carroy@basf.com, +49 173 3799015
 Uwe Meisenburg, uwe.meisenburg@basf.com, +49 174 3494595
• Commercial: (pricing)
 Vijay Raman, vijay-immanuel.raman@basf.com, +49 1520 9376789
Link to presentation: www.slideshare.com and/or www.basf.com/ecs
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