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Nomenclature Bayhydrol®

K 2010
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Marine coatings – Fast application with polyurethane systems

Down times for service and maintenance are becoming ever shorter which puts very demanding requirements on corrosion protection.
Polyurethane coating systems can meet these requirements perfectly and they provide excellent protection: Even at low temperatures they are curing fast, which is a crucial factor when it comes to accelerating the coating process. In addition, they are resistant against both salt and fresh water, diesel fuel and most chemicals. Polyurethane systems are also excellent solutions for systems using sacrificial anodes and external power sources.

Aromatic and aliphatic polyisocyanates of the Desmodur® range with their reaction partners of the Desmophen® range provide reliable corrosion protection in base coats, intermediate coats or top coats. Aliphatic polyurethane systems show particularly good lightfastness and very good weather resistance.


Examples of polyurethane raw materials for this application:

For 1K und 2K polyurethane coatings

Type
Solids in %
% NCO or OH
on solids
Viscosity
mPas at 23°C
Characteristics
Desmophen® 1150
Branched
polyol
100
4.7 OH
3500
Wear resistant, good chemical resistance
Desmodur® N 75 MPA/X
HDI biuret
75
22.0 NCO
250
High gloss, chemical and weather resistance, lightfast, high mechanical resistance
Desmodur® E
1361 MPA/X
TDI
Polyisocyanate prepolymer
61
11.1 NCO
500
Resistant against moisture, oils, fuels and aggressive chemicals
Desmodur® N 3390 BA
HDI trimer
90
21.8 NCO
500
High gloss, good chemical and weather resistance, lightfast, high mechanical resistance
Desmodur® E 14
TDI
Aromatic polyisocyanate
prepolymer
100
3.3 NCO
6800
For highly elastic coatings and sealants
Desmodur® E 21
MDI polyisocyanate prepolymer
100
16.0 NCO
5400
Tough elastic, wear resistant
Desmodur® E 23
MDI
polyisocyanate prepolymer
100
15.4 NCO
1800
As primer and sealant of porous substrates and as protection against moisture, oils, fuels and other chemicals
Desmodur® VL
MDI polyisocyanate
100
31.5 NCO
90
For hard to elastic coatings

Suitable combination partners for Desmodur® N grades can be polyols like hydroxy acrylates (like those by our associated company Viverso).

For chlorinated rubber coatings

Molecular weight
Viscosity 1)
mPas
at 23°C
Elasticity2)
Iodine color value *
Characteristics
Pergut® S 5
60000
5
0.5
< 7
For fast curing, weather proof, water and chemical resistant coatings
Pergut® S 10
80000
11
2.4
< 7
For fast curing, weather proof, water and chemical resistant coatings
Pergut® S 20
135000
20
35 – 55
< 7
Similar to Pergut® S 10, high abrasion resistance
Pergut® S 40
165000
42
4.8
< 7
For fast curing weather, water and chemical resistant coatings, improves drying and resistance against inorganic acids
1) 18.5 % in toluene
2) Erichsen cupping test Clearcoad, Pergut/Desavin/Xylen (30:3:70), 100’ bei 90°C

Select Starting Formulations

RR 5290One-component polyurethane primer for marine coatings
(Desmodur® E 1361)

RR 5291One-component polyurethane intermediate coat for marine coatings
(Desmodur® E 1361)

RR 5292Two-component polyurethane topcoat for marine coatings
(Desmophen® A /Desmodur® N 75)

Have a look at this presentation for the European Coatings Conference 2008:
"Impact of Containerization on Polyurethane and Polyurea in Marine and Protective Coatings"


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