METHOD OF GLUING PROTECTIVE POLYURETHANE COATING TO METALLIC SURFACE Russian patent published in 2006 - IPC C09J5/02 C09D175/04 

FIELD: protective coatings.

SUBSTANCE: invention relates to methods for protecting metallic surfaces of geophysical instruments for exploring wells against combined action of generated acoustic field, drilling mud components, and formation fluids causing rapid wear of well instrument body. Gluing of protective polyurethane coating to cleaned and degreased metallic surface is effected by a way wherein glue composition based on triphenylmethanetriisocyanate in organic solvent is preliminarily applied onto surface as a layer with thickness 0.5-5 μm, preferably 1-3 μm, after which applied film is aged for 15-30 min at 100°C or for 12-18 h at 20-25°C and relative air humidity 30 to 98% and then protective coating based on lacquer polyurethane and/or poured polyurethane composition is deposited and hardened by a known method.

EFFECT: improved quality of received acoustic signal.

4 cl, 1 tbl, 3 ex