EXTERNAL POLYURETHANE TWO-COMPONENT PROTECTIVE COATING (VERSIONS) Russian patent published in 2013 - IPC C09D175/04 F16L58/02 

FIELD: chemistry.

SUBSTANCE: invention relates to pipeline construction and is used in field and basic conditions when laying underground main pipelines for protection thereof from corrosion, mechanical damage and during construction of gas or liquid transporting field and industrial pipelines in conditions of permanently frozen soil, when laying pipelines on swamps, on waterlogged areas, particularly for repairing anti-corrosion coatings of oil pipelines, oil product pipeline and gas pipelines during repair thereof in field conditions, including without stopping transportation of the product, and during corrosion protection of piping of compressor stations at pipeline temperature of 70-90°C, on a section of a pipeline transporting gas at temperature above zero after a compressor station, e.g. at a section of a discharge line transporting compressed gas at temperature of plus 40°C. Versions of anti-corrosion paint for obtaining an external polyurethane two-component protective coating are given. The paint is obtained by mixing component A and component B - polyisocyanate based on diphenyl methane diisocyanate with equivalent mass of 131-135. Component A is a suspension of substances in a hydroxyl-containing polyatomic alcohol with ether and ester bonds with equivalent mass of 230….250.

EFFECT: providing high rate of hardening of the coating with improved protective properties thereof, which prevents development of underfilm and stress corrosion on the pipeline for a period of time comparable with the life of the pipeline.

6 cl