RU2325584C1 - Insulating anticorrosive material "pam" - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: material is designed for protection against corrosion in case of major overhauling of gas- and oil-products pipelines insulating covering (recoating) in the field. Material of pipeline external surface protection contains layer of bitumen-polymer mastic compound, with reinforcing glass mesh immersed in it, and anti-adhesive layer, at that reinforcing glass mesh is made of glass threads with diameter from 0.2 to 0.25 mm by means of interlacing with cell size of 2.5x2.5 mm, and it is installed at the distance that is equal to 20-40% of bitumen-polymer mastic compound layer depth from the anti-adhesive layer, at that bitumen-polymer mastic compound has the following ingredients composition, percent by weight: bitumen "БНД"-60/90 7-14, bitumen "БН"-70/30 60-85, thermoelastolayer 4-12, petroleum polymer resin 2-10, polybutadiene low-molecular rubber 5-10.

EFFECT: improves efficiency of anticorrosive protection activities in the field.

2 dwg

Description

The invention relates to the field of construction, and in particular to materials intended for protection against corrosion when carrying out major repairs of insulating coatings (re-insulation) of gas and oil product pipelines under highway conditions.

Known used as a protective coating is the construction of an insulating tape to protect the outer surface of underground pipelines, including a polymer film base made of polyvinyl chloride, a mastic layer with reinforcing material placed in it and a release layer (RU 29572 U1, IPC7 F16L 58/10, publ. 20.05. 2003).

Such a tape has high strength properties, but does not have the property of heat shrinkage, so it can only be applied to a cold primer, and when applied to hot mastics, corrugations and folds will form due to the thermal expansion of the tape during heating from hot mastic.

The closest technical solution, selected as a prototype, is an insulating anti-corrosion material for protecting the outer surface of the pipeline, containing a layer of bitumen-polymer mastic in which a reinforcing glass mesh is immersed, and an anti-adhesive layer (RU 50278 U1, IPC7 F16L 58/10, publ. 12/27/2005).

The process of insulation of pipelines with such insulating tapes is characterized by high manufacturability and safety, however, despite this, as well as the improved quality characteristics of the polymer base film made of polyethylene or a copolymer of ethylene with vinyl acetate, it is electronically chemically modified and uniaxially oriented, its mechanical strength continues stay not high enough.

Another disadvantage of the known material is its high cost due to the presence of a specially processed polymer base film, as well as low adhesion of the tape to the tape in the overlap and to primed steel during shear, and as a result, low protective properties of the insulating anticorrosive material.

The technical problem to which the invention is directed is to eliminate the above disadvantages, namely, reducing the cost of insulating anti-corrosion material and improving the quality of the coating.

This problem is solved due to the fact that the insulating anticorrosive material for protecting the outer surface of the pipeline contains a layer of bitumen-polymer mastic in which the reinforcing glass mesh is immersed, and an anti-adhesive layer, while the reinforcing glass mesh is made of glass fibers with a diameter of 0.2 to 0 , 25 mm by the method of cross-linking weaving with a mesh size of 2.5 × 2.5 mm and is located at a distance equal to 20-40% of the thickness of the layer of bitumen-polymer mastic from the release layer, while the bitumen-polymer mastic has t the following composition of components, wt.%: bitumen BND-60/90 7-14, bitumen BN-70/30 60-85, thermoplastic elastomer 4-12, petroleum resin 2-10, polybutadiene low molecular weight rubber 5-10.

Bitumen-polymer mastic is a multicomponent composition and has the following composition of components, wt.%: Bitumen BND-60/90 7-14, bitumen BN-70/30 60-85, thermoplastic elastomer 4-12, petroleum resin 2-10, polybutadiene low molecular weight rubber 5-10.

The reinforcing glass mesh is made of glass filaments with a diameter of 0.2 to 0.25 mm by the method of crosslinking with a mesh size of 2.5 × 2.5 mm, impregnated with a binder based on bitumen and organic solvents with the introduction of synthetic modifying additives, the temperature interval of operation of which ranges from -50 ° С to + 50 ° С.

The anti-adhesive layer can be made of any material that provides free unwinding of the roll without sticking to the mastic layer of the tape, mainly laminated paper, or polyethylene terephthalic film.

The technical result to which this invention is directed is to increase the efficiency of anticorrosive protection of gas-oil and gas pipelines under highway conditions by reducing the time for their completion under highway conditions and reducing labor and energy costs.

The table shows the performance data of the proposed insulating anti-corrosion material and material according to GOST R 51164-98.

The drawing shows the structure of an insulating anti-corrosion material.

Insulating anticorrosive material is made in the form of a rolled multilayer structure where:

1 - layer of bitumen-polymer mastic

2 - reinforcing glass mesh

3 - layer of bitumen-polymer mastic

4 - release layer.

Insulated anticorrosive reinforced material is manufactured in the factory using standard equipment consisting of units: melt mastic, applying mastic, cooling roll insulation anticorrosive material, applying a release layer and winding.

Bitumen-polymer insulation mastic, which is a multicomponent composition, the composition of which is indicated earlier, is cleaned from packaging and loaded into a melting pot. Mastic heated to a temperature of 140-160 ° С from the boiler enters through the heated flexible metal sleeve into the intermediate bath of the application unit, then by the pump to the flow bath, while the temperature in the intermediate and flow baths is automatically maintained in the range from 130 to 160 ° C.

Rolled reinforced material (RAM) is made by dipping a glass reinforcing mesh into a melt of bitumen-polymer mastic with a subsequent stage of combining with a reinforcing fiberglass mesh. To prevent the resulting structure from sticking together in a roll, a release material, such as paper, is applied to its mastic layer. Next, the obtained insulating anti-corrosion material is wound on a polyethylene sleeve.

The table shows the performance data of the proposed insulating anti-corrosion material and material according to GOST R 51164-98.

The table shows that the proposed insulating anti-corrosion material has increased adhesion of the tape to the tape in the overlap and to the primed steel during shear.

This indicates the high protective properties of this roll material and high performance during insulation and laying works.

The proposed insulating anticorrosive material can be effectively used in route conditions when isolating the outer surface of steel underground gas and oil pipelines, product pipelines, water pipelines with a diameter of up to 1420 mm at an operating temperature of up to + 40 ° C.

RAM insulating anticorrosive material

Table No. p / p Name of indicator GOST 51164-98 norm Indicator value Test method The inventive insulating anti-corrosion material RAM one Thickness mm > 1.5 1.7 ± 2 GOST 17035 2 The temperature of the brittleness of the mastic layer, ° C -twenty -twenty GOST 2678 3 Adhesion to steel at 20 ° C, N / cm - 36 GOST 411 method B four The adhesion of the tape to the tape in the overlap at 20 ° C, N / cm 7.0 26 GOST 411 method B 5 Adhesion to primed steel at shear at 20 ° С, MPa / m ² 0.1 0.34 GOST 14759 V = 15 mm / s

Claims (1)

RAM insulating anticorrosive material containing a layer of bitumen-polymer mastic, in which a reinforcing glass mesh is immersed, and an anti-adhesive layer, characterized in that the reinforcing glass mesh is made of glass filaments with a diameter of 0.2 to 0.25 mm by a crosslinking method with a mesh size 2.5 × 2.5 mm and is located at a distance of 20-40% of the thickness of the layer of bitumen-polymer mastic, from the release layer, while the bitumen-polymer mastic has the following composition of components, wt.%: Bitumen BND-60 / 90 7-14, bitumen BN-70/30 60 -85, thermoplastic elastomer 4-12, petroleum resin 2-10, low molecular weight polybutadiene rubber 5-10.