Polyurethane corrosion protection – Lasting protection for valuable steel structures

High-quality polyurethane coatings significantly improve the corrosion resistance of steel, which is important when it comes to ensuring longevity and safety of expensive investment objects, in particular:

Pipe coatings

• Exterior pipe coatings
• Interior pipe coatings (oil, gas, water, chemicals)
• Interior coatings of pressure pipes
  

Marine Coatings

• Ships
• Offshore platforms
  

Structural Engineering

• Industrial equipment
• Conveyor systems
• Bridges, cranes, pylons
• Other Steel structures
  

Hydraulic Engineering

• Port facilities, sheet pile walls
• Watergates, docks

In general, multi-layer coating systems are applied and they have to meet specific standards. Polyurethane coatings meet these high requirements in a perfect way.

Pergut® is Bayer MaterialScience’s trade name for chlorinated rubber in heavy-duty corrosion protection, which is distributed by.

Polyaspartics are the latest development for corrosion protection. They cure faster and allow thicker film layers, which makes the application of high-quality coatings faster and more simple.

Selection of products for one-component corrosion protection coatings:

	Type	Solids in %	% NCO content on solids	Viscosity mPas at 23°C	Characteristics
Desmodur® E 1361 MPA/X	TDI-prepolymer	61	6.8	500	Corrosion protection coatings, fast curing, resistant against bubble formation
Desmodur® E 21	MDI prepolymer	100	16.0	5400	Corrosion protection coatings, slower curing than E 1361, increased content of solids
Desmodur® E 23	MDI prepolymer	100	15.4	1800	Corrosion protection coatings, slower curing than E 21, more content of solids than E 1361
Desmodur® E 14	TDI-prepolymer	100	3.3	6800	Elastifying resin

Selection of products for two-component corrosion protection coatings

	Solids in %	% NCO content on solids	Viscosity mPas at 23°C	VOC	Characteristics
Desmodur® N 75 MPA/X	75	16.5	225	+	Lightfast, good weather and chemical resistance, outstanding mechanical properties
Desmodur® N 3390 BA	90	19.6	600	++	Good chemical and weather resistance, lightfast, high mechanical resistance
Desmodur® N 3600	100	23.0	1200	+++	For high solid coatings, good chemical and weather resistance, lightfast, high mechanical resistance

Chlorinated rubber products

	Molecular- weight (g/mol)	Viscosity mPas2) at 23°C	Elasticity (mm)1)	Characteristics
Pergut® S 5	60000	4 - 7	0,5	As additive for low-viscosity alkyd resins
Pergut® S 10	85000	8 - 14	2,4	As additive for low-viscosity alkyd resins, or by itself as a binder for heavy corrosion protection
Pergut® S 20	135000	17 – 25	35 – 55	As additive for low-viscosity alkyd resins, or by itself as a binder for heavy corrosion protection
Pergut® S 40	165000	35 - 55	4.8	As additive for low-viscosity alkyd resins, high chemical resistance

¹⁾ according to Erichsen cupping test of a clear coat Pergut/Desavin/Xylen (30:3:70), 100’ at 90°C
²⁾ the viscosity is determined in a 18,5% toluene solution at 23°C

Starting formulations for general corrosion protection:

RR 5280	Primer for steel (Desmodur® E 23)
RR 5282	Intermediate coat (Desmodur® E 23)
RR 5283	Top coat (Desmodur® N 75 MPA/X)

Have a look at the following information:

Presentation at ECS 2007: "A new Generation of Polyurethane Primers: 2-Component Waterborne"

Presentation at the European Coatings Conference 2008:
"Impact of Containerization on Polyurethane and Polyurea in Marine and Protective Coatings"

Presentation at the FATIPEC Conference June 9-11th, 2008 in Ghent, Belgium: "Polyaspartics – Innovative binders for cost effective coating concepts"; with the Presentation Paper

Brochure: Prepolymers - Products & Applications

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