Novel Light-triggered Tin Free Metal Catalyst for fast curing of 2K-PUR Coatings

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

Video

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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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Photo-Latent Metal Catalyst... why?

1. Fast curing of applied 2K-PUR coating at RT

Reduced energy consumption: RT vs. 60-80°C

– Address issue of heating very large objects, heat-sensitive parts, or heavy metal structures

Increased through-put

– Short time to dust-free

– Short time to handling/moving of coated object

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Proposed Solution = non-Sn metal catalyst triggered by UV-light, thus activated at RT + when desired (“cure-on-demand”).

2. Long pot-life, i.e. >>1hr. (ideally up to 6hrs.)

Reduced paint waste

More flexible process timing

3. Organotin free compound

Heat sensitive substrates

Applications

Coatings Market for 2K-PUR Global ~17,000 kT

26%

15%

13% 7% 2%

7%

14%

2% 0%

8% 4%

Car Parts

ACE

Aerospace 3C & Household

Wind Power General Industry F & F

Auto OEM

Refinish

Large objects Low temperature

processing

Need to reduce cycle and storage times

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Concept: RT Curing of 2K-PUR with UV-light triggered Catalyst

Poly-NCO (e.g. Basonat®)

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Polyol (e.g. Joncryl®)

Non-latent Catalyst (e.g. DBTL)

Short Pot-life << 1hr.

Fast curing requires thermal energy !

~ 30 min. @ 60-80°C

catalyst

Mixing

2K-PUR Coating (+ catalyst)

Coating

Photo-Latent Metal Catalyst (SolyfastTM)

PLMeCat

Me Cat

High catalytic activity at room temperature

No/low activity

Longer Pot-life 3-6hrs.

Fast Curing @ RT

UV@RT

Supply forms & properties:

AMES test: negative! non-mutagenic

Photo-Latent Metal Catalyst SolyfastTM

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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

UV-Absorption Spectrum of SolyfastTM

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0

0,2

0,4

0,6

0,8

200 250 300 350 400 450

Abso

rptio

n

0,05%0,00%

UV-C

UV-B

Hg Fe Ga

UV-LED UV-A

Wavelength (nm)

Lab Set-up for UV-A Activation of SolyfastTM

Empty drum (for stand-by

position of the running lamp)

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UV-A Screening effect of black filter

UV-F450 “Flood Lamp” (Panacol-Elosol)

HB-404 (Philips)

UV-A Lamp (450W)

Coated panel

Substrate holder (adjustable distance)

Drum 1 Drum 2

Fe

UV-Lamps Output: UV-Dose (J/cm²) Influence of Distance, Power, ...

10

0

1

2

3

4

5

6

HB-404 10cmD-bulb Fusion

UVCUVBUVA

UV-

Dos

e (J

/cm

²)

2 m

in.

expo

sure

3 m

/min

. (8

0% p

ower

)

HB-404 (Philips)

0

1

2

3

4

5

6F4

5020

cm

HB

-404

20cm

HB

-404

10cm

UVC

UVB

UVA

UV-

Dos

e (J

/cm

²)

UV-F450 “Flood Lamp” (Panacol-Elosol)

UV-Lamps Output: Dose (J/cm²) vs. Intensity (W/cm2)

11

0

1

2

3

4

5

6

HB-404 10cmD-bulb Fusion

UVCUVBUVA

UV-

Dos

e (J

/cm

²)

0

1

2

3

4

5

6

HB-404 10cmD-bulb Fusion

UVCUVBUVA

UV-

Inte

nsity

(W/c

m²)

2 min. exposure 3 m/min.

(80% power)

2 min. exposure 3 m/min.

(80% power)

Monitoring of 2K-PUR Curing: “Sand Test”

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1

2

3

4

Surface-cure (tack-free) sand dry

t=0

Through-cure (scratch-free)

Monitoring of 2K-PUR Curing: FTIR Analysis % NCO

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BaF2 crystal

SolyfastTM Catalytic Activity in a model 2K-PUR Clear Coat

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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

Surface Cure

Through Cure0

2

4

6

8

San

d te

st d

ryin

g tim

e (h

r.) >24hr.

SolyfastTM Catalytic Activity Benchmark in model 2K-PUR Clear Coat

DBTL (0,0095%)

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No cat

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

DFT : ~50µm

SolyfastTM Activity in 2K-PUR Clear Coat Influence of UV Activation

Activation under „UV-F450“

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0

5

10

15

20

No Cat 0 ~0.7 ~1,3 ~4

Surface CureThrough Cure

UV-A dose (J/cm²)

San

d te

st d

ryin

g tim

e (h

r.) >24hr.

0

5

10

15

20

No Cat 0 ~ 1 ~ 2 ~5

Surface CureThrough Cure

UV-A dose (J/cm²)

San

d te

st d

ryin

g tim

e (h

r.) >24hr.

Activation under „HB-404“ SolyfastTM 0010 at 0.044wt.% on total formula based on Joncryl® 507 and Basonat® HI-2000.

Higher UV-dose higher activity of SolyfastTM, thus faster curing

(only 63ppm Me on resins solids)

SolyfastTM and Pot-Life Example in one model 2K-PUR Clear

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0

200

400

600

800

1000

1200

1400

0 1 2 3 4 5 6

DBTL (0,025%)ZnOct (0,126%)Solyfast (0,172%)Solyfast+PDO (80/20)

Viscosity (mPa.s)

Time (hr.) after mixing Comp. A + Comp. B

Pot-life: Viscosity Increase

“PDO” = 2,4-pentanedione or acetyl-acetone

Very slow curing even 30’@60°C

2K-PUR clear coat based on Joncryl® 507 and mixed x-linkers, i.e. HDI-trimer + IPDI-allophanate

Solyfast = SolyfastTM 0010

Catalyst (solid) concentration: in wt.% on total formulation

SolyfastTM with HDI based Polyisocyanates: UV Activation & NCO Conversion

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0

20

40

60

80

100

t = 0 NoUV

1hr. 2hr. 3hr. 4hr. 5hr. 6hr. 7hr. 8hr.

HI-100 HA-1000HB-100 HI-2000

0

20

40

60

80

100

t = 0 AfterUV

1hr. 2hr. 3hr. 4hr. 5hr. 6hr. 7hr. 8hr. 24hr.

HI-100 HA-1000HB-100 HI-2000

Unreacted NCO (%) Unreacted NCO (%)

No light activation Activation under „HB-404“ (~3J/cm²)

SolyfastTM 0010 at 0.16wt.% on total formula based on Joncryl® 507 and various Basonat®: tests done with blend SolyfastTM/PDO (80/20)

SolyfastTM with HDI based Polyisocyanates: UV Activation & Solvent resistance development

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0

20

40

60

80

100

1hr. 2hr. 4hr. 7hr. 24hr.

Acetone double-rubs

HI-2000 HB-100

HA-1000 HI-100

0

20

40

60

80

100

1hr. 2hr. 4hr. 7hr. 24hr.

Acetone double-rubs

HI-2000 HB-100

HA-1000 HI-100

No light activation Activation under „HB-404“ (~3J/cm²)

SolyfastTM 0010 at 0.16wt.% on total formula based on Joncryl® 507 and various Basonat®: tests done with blend SolyfastTM/PDO (80/20)

SolyfastTM Activity in Pigmented 2K-PUR Benchmark in White Coating

No Cat @RT

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DBTL @RT (0,018%) No UV ~3J/cm² UVA

SolyfastTM 0010 (0,045%) @RT

DFT : ~50µm

RT = room temperature

Catalyst (solid) concentration: in wt.% on total formulation

2K-PUR white (~45wt.% TiO2 on resin solids) based on Joncryl® 507 and Basonat® HI-100

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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Contact Info:

• Technical: Antoine Carroy, [email protected], +49 173 3799015 Uwe Meisenburg, [email protected], +49 174 3494595

• Commercial: (pricing)

Vijay Raman, [email protected], +49 1520 9376789

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