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® 1145	Branched polyol	100	7.1 OH	2950	For tough and hard coatings
Desmophen® 1150	Branched polyol	100	4.7 OH	2500	Wear resistant, good chemical resistance
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

Select starting formulations

RR 5276	Solventfree two-component polyurethane coating
	(Desmophen® 1145 / Desmophen® 1150 / Desmodur® VL)
	.
RR 5277	Solventfree two-component polyurethane coating
	(Desmophen® 1145 / Desmophen® 1150 / Triethylene glycol / Desmodur® VL)
	.
RR 5278	Solventfree two-component polyurethane coating
	(Desmophen® 1145 / Desmophen® 1150 / Desmophen® 1380 BT / Desmodur® VL)