DURABILITY OF POLYURETHANE COATINGS IN CONCENTRATED SOLUTIONS OF MINERAL FERTILIZERS

Polyurethane Primer Coatings Polyurethol tested in these solutions for 14 months. Coatings Polyurethol containing a hardener retained good adhesion to St3 steel. Coatings Polyurethol without hardener lost adhesion in solutions of potassium chloride, borofoska, diammofoska and nitrophoska. The effect of a borofoska solution on the electrical conductivity (from 1 nA) and resistance (up to 10 GΩ) of Polyurethol and Raptor coatings was studied using the IKS-1 measuring kit. Coatings were applied by spraying and brushing, in one and several coats, with and without hardener. The electrical resistance of a two-layer coating of Polyurethol was 130 MΩ, a single-layer coating was 17 MΩ after a year of atmospheric testing. The electrical resistance of the Raptor coating in three layers with a thickness of 300 microns decreased from 130 to 22 MΩ after 200 days of testing in a solution of borofoska. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It has been established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions. The insulating power of 1 coat of Polyurethol when applied by spray is equal to the insulating power of 2 coats of Raptor when applied by brush. It was established that polyurethane coatings Polyurethol and Raptor are suitable for anticorrosion protection of low-carbon steels from the action of mineral fertilizer solutions.