METHOD FOR ANTICORROSIVE INSULATION OF WELDING JOINTS AND DAMAGED LOCATIONS OF PIPELINE

FIELD: corrosion protection. SUBSTANCE: invention, in particular, relates to protecting underground pipelines against damages and soil and atmospheric corrosion. Method is accomplished by way of applying thermally shrinkable multilayer adhesive tape composed of (i) protective polyethylene tape layer...

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Bibliographic Details
Main Authors DEBERDEEV R.JA, STOJANOV O.V, MUKHAMEDZJANOVA EH.R, KHUZAKHANOV R.M, NIKITINA N.N, ZAIKIN A.E, KAPITSKAJA JA.V
Format Patent
LanguageEnglish
Russian
Published 20.05.2004
Edition7
Subjects
ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE
ADHESIVES
BLASTING
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
ENGINEERING ELEMENTS AND UNITS
FILLING PASTES
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
INKS
JOINTS OR FITTINGS FOR PIPES
LIGHTING
MEANS FOR THERMAL INSULATION IN GENERAL
MECHANICAL ENGINEERING
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
PIPES
POLISHES
SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING
THERMAL INSULATION IN GENERAL
USE OF MATERIALS AS ADHESIVES
USE OF MATERIALS THEREFOR
WEAPONS
WOODSTAINS
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Summary:FIELD: corrosion protection. SUBSTANCE: invention, in particular, relates to protecting underground pipelines against damages and soil and atmospheric corrosion. Method is accomplished by way of applying thermally shrinkable multilayer adhesive tape composed of (i) protective polyethylene tape layer electronically-and-chemically modified to absorb dose of 25-50 MRad and oriented in longitudinal direction by 25-75% and (ii) adhesive layer, which, before applying multilayer adhesive tape, is covered with epoxide composition and which adhesive layer is formulated with two ethylene/vinyl acetate copolymers differing from each other by 5-20% vinyl acetate group content and, additionally, a third ethylene/vinyl acetate copolymer with 27-30% vinyl acetate group content and showing melt flowability index 15-30 g/10 min, and further containing mineral filler and polyisocyanate as modifier. Adhesion of such coating to steel after exposure to salt water is increased by a factor of 1.7, while cathodic detachment is lowered by 2 times. EFFECT: enhanced anticorrosive protection and increased strength of adhesion to steel surfaces. 2 tbl
Bibliography:Application Number: RU20020134107