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Title: 2K Polyurethane coatings for wood and furniture
Description: Introduction to DD-systems: Desmodur Hardeners
Description: Introduction to DD-systems: Desmodur Hardeners
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2K Polyurethane coatings
for wood and furniture
Coatings, Adhesives & Sealants EEMEA/LATAM
Properties of DD - coating for wood
•
•
•
•
•
•
•
•
•
•
Hardness
Long - term flexibility
Scratch and abrasion resistance
Impact resistance
Water, solvent and chemical resistance
Colour stability
Fast drying
Easy sandability
Wide range of surface effects
Adhesion on tropical wood
Coatings, Adhesives & Sealants EEMEA/LATAM
DD wood coating applications
• Furniture
– kitchens
– living and bedrooms
– children rooms
– offices
– laboratories
• Musical instruments
• Panels
• Parquet
• etc
...
Bayer (1937)
Coatings, Adhesives & Sealants EEMEA/LATAM
O
Introduction to DD-systems
• Two - component system
Polyol
Desmophen
+
OH +
Hardener
Desmodur
• One - component system
NCO
HO
NCO
NCO
+
Lacquer
Desmodur
+
Atmospheric
humidity
NCO
H2O
NH
NH
Coatings, Adhesives & Sealants EEMEA/LATAM
C O + CO2
Introduction to DD-systems: Desmodur Hardeners
In the beginning use of monomeric aromatic
isocyanates for fibres, foams etc:
NCO OCN
OCN
NCO
MDI
NCO
NCO
TDI
-> high vapour pressure and low functionality
=> development of polyisocyanates
Coatings, Adhesives & Sealants EEMEA/LATAM
Introduction to DD-systems: Desmodur Hardeners
Use of aromatic Poly-Isocyanates
as raw materials for coatings since 1943
...
HDI: Hexamethylene
diisocyanate
NCO
OCN
x
O
OCN
HDI-Biuret*
H
N
3, + H2O, - CO2
O
N
N
NCO
H
NCO
Desmodur N 100, N 75
*ideal structure
Coatings, Adhesives & Sealants EEMEA/LATAM
Non Yellowing
Introduction to DD-systems: Desmodur Hardeners
Market Introduction of HDI-Trimers in the early 80´s
O
OCN-(CH2)6
HDI-Isocyanurates
(Trimers)
=>
N
O
N
N
O
(CH2)6-NCO
lower viscosity
better monomer stability
vs
...
s)
(mPa
...
0 + 2
...
0 + 2
...
0 + 2
...
0 + 2
...
3 + 0
...
3 + 0
...
9 + 0
...
9 + 0
...
75 + 0
...
75 + 0
...
0 + 2
...
0 + 2
...
0 + 0
...
0 + 0
...
0 + 2
...
0 + 2
...
0 + 0
...
0 + 0
...
0 + 2
...
0 + 2
...
4 + 0
...
4 + 0
...
0 + 2
...
0 + 2
...
5 + 0
...
5 + 0
...
5 + 0
...
5 + 0
...
5 + 0
...
5 + 0
...
0 + 1
...
0 + 1
...
6 + 0
...
6 + 0
...
)
300
270
240
L 75 / IL 1451
210
In combination with
Desmophen TP
( NCO:OH =1)
180
150
L 75 / IL 1351
120
90
60
30
L 1470 / IL 145
Climate:
L 1470 / IL 1351 = 22
...
F
...
5°C / 55% r
...
L 75 / IL 1351 = 22,5°C / 50% r
...
L 75 / IL 1451 = 22
...
F
...
)
(min
...
)
(sec
...
dur IL 1451
50
Desmodur IL
40
Desmodur IL 1351
30
20
10
0
40%
35%
30%
Solid content
Coatings, Adhesives & Sealants EEMEA/LATAM
25%
20%
NC-compatibility of Desmodur IL types
Turbidity
( TE / F )
250
IL ~ 1
2
200
IL 1351 ~ 2
IL 1451 ~3
150
1
100
50
standard
+ 2 % NC
3
0
0
2,5
5
7,5
10
12,5
15
17,5
% NC E 510
Coatings, Adhesives & Sealants EEMEA/LATAM
20
IL 1451
+ 2 % NC
Gloss Development of Desmodur IL types
Top coat cured with
Desmodur IL 1351
Desmodur IL 1451
Coatings, Adhesives & Sealants EEMEA/LATAM
Yellowing of DD-systems
Coatings, Adhesives & Sealants EEMEA/LATAM
Yellowing of DD-systems
Delta E after 6 months behind window glass
Desmophen phys
...
Desmophen phys
...
binder
substrate
binder
substrate
maple tree
maple tree
(bright wood)
(bright wood)
walnut tree
walnut tree
(dark wood)
(dark wood)
+Tinuvin*
+Tinuvin*
(Standard)
(Standard)
AA450
450
NC
NCEE330
330
NN75
75
AA450
450
1300
1300
CAB
CAB381-0
...
5
__
__
NN75
75
HL
HL
1300
1300
1300
1300
NC
NCEE510
510
___
___
HL
HL
IL/L
IL/L
1300
1300
NC
NCEE510
510
IL/L
IL/L
ca
...
24
ca
...
23
ca
...
38
ca
...
25
ca
...
43
ca
...
40
Mahogany
Mahogany
(dark wood)
(dark wood)
+Tinuvin*
+Tinuvin*
+Tinuvin*
+Tinuvin*
0,5
0,5
5,1
5,1
12,8
12,8
11,9
11,9
3,7
3,7
4,4
4,4
7,7
7,7
7,6
7,6
5,7
5,7
5,8
5,8
4,9
4,9
0,5
0,5
0,5
0,5
14,0
14,0
11,2
11,2
2,3
2,3
2,3
2,3
11,7
11,7
6,2
6,2
7,1
7,1
4,1
4,1
5,4
5,4
4,9
4,9
4,9
4,9
3,7
3,7
4,5
4,5
10,7
10,7
14,5
14,5
14,8
14,8
4,2
4,2
4,9
4,9
8,0
8,0
12,3
12,3
7,2
7,2
6,0
6,0
7,7
7,7
7,2
7,2
4,8
4,8
5,4
5,4
25,5
25,5
19,2
19,2
8,6
8,6
10,5
10,5
10,3
10,3
6,9
6,9
6,1
6,1
On maple, walnut and mahogany = 2 x ca
...
100 g/m² +2 x pigmented filler RR 6636 ca
...
modified polyester
...
500
3
...
coats (clear and pigmented)
...
modified polyester
...
000
11
...
to matting
...
modified polyester
...
modified polyester
...
350
5
...
Hard, highly reactive and long pot-life
...
000
10
...
acid- modified polyester
...
acid- modified polyester
...
500
1
...
500
7
...
content in sealers
...
application viscosity
...
fatty acids
...
000
15
...
5%
2
...
polyisocyanate (Desmodur L/IL)
...
fatty acids
...
250
9
...
4%
2
...
polyisocyanate (Desmodur L/IL)
Title: 2K Polyurethane coatings for wood and furniture
Description: Introduction to DD-systems: Desmodur Hardeners
Description: Introduction to DD-systems: Desmodur Hardeners