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Pipe coatings – Efficient corrosion protection with polyurethane coatings


Corrosion protection of steel pipes for transportation of oil, gas or water is of great economic interest. Liquid polyurethane systems are particularly suitable for this kind of application because they can be applied directly to the substrate in one layer of up to 2 mm.

In addition, the curing process is fast even at low temperatures. Good impact resistance as well as permanent elasticity, good resistance against micro organisms and good cathodic protection makes them suitable even for welded joints.

Bayer MaterialScience’s Desmodur® und Desmophen® grades are particularly suitable for solventfree polyurethane pipe coatings. Two-component systems can be applied using airless spraying equipment and do not require any other complex application equipment.









Examples of polyurethane raw materials for this application

Type
Solids in %
% NCO or OH
on solids
Viscosity
mPas at 23°C
Characteristics
Desmophen® 1380 BT
Trifunctional
polypropylene ether polyol
100
11.7 OH
600
For elastic coatings
Desmodur® VL
MDI polyisocyanate
100
31.5 NCO
90
For hard to elastic coatings
Desmodur® VL R 20
MDI polyisocyanate
100
31.5 NCO
200
For hard to elastic coatings

Some starting formulations (examples)

RR 5276solventfree 2K polyurethane coating
(Desmophen® 1145 / Desmophen® 1150 / Desmodur® VL)
.
RR 5277solventfree 2K polyurethane coating
(Desmophen® 1145 / Desmophen® 1150 / Triethylenglykol / Desmodur® VL)
.
RR 5278solventfree 2K polyurethane coating
(Desmophen® 1145 / Desmophen® 1150 / Desmophen® 1380 BT / Desmodur® VL)




Technical data and application information in these product overviews:

Produktbroschüre - Isocyanate und Prepolymere
Polyisocyanates and Prepolymers: Products and Applications
Produktbroschüre Polyole und Aspartics
Resins - Polyols and Aspartics for reaction with Polyisocyanates


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