COMPOSITION FOR REMOVING THICK-LAYER POLYUREA, POLYURETHANE AND POLYUREA-URETHANE COATINGS Russian patent published in 2014 - IPC C09D9/00 C09D9/04 B08B3/08 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical agents (removers) for softening with the purpose of subsequent removal of local areas of off-grade thick-layer (1.0-4.0 mm) polymer coatings from surfaces of metal pipes of main and field oil- and gas pipelines and product pipelines with liquid hydrocarbons, as well as profiled coupling members, fittings, stop valves and mount assemblies, pipes and fittings of compressor and pumping stations, underground gas storage stations and oil storages in factory and field coating conditions during construction, reconstruction and repair of pipeline systems. The composition contains, wt %: polar aprotic cosolvent - N,N-dimethylformamide 30.0-35.0, polymer thickener - polyvinyl chloride chlorinated resin of the PSX-LS type 20.0-25.0, evaporation retardant - paraffin or vaseline oil 0.3-1.0, disintegrant and surfactant in form of distilled tall oil or fatty acids of tall oil, having acid number of 165-195 mgKOH/g 10.0-15.0, active organochloride solvent - methylene chloride - the balance up to 100.0.

EFFECT: effectiveness in removal of thick-layer coatings from inclined and vertical surfaces, low toxicity and absence of corrosive action on articles made of ferrous metal.

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