RU99099U1 - ROLLED MASTIC MATERIAL ON A TEXTILE BASE-BASIS - Google Patents

Abstract

 Rolled mastic material, consisting of a base, a mastic layer and a release layer, characterized in that the roll material contains a geotextile impregnated with mastic as a base tape, while the mastic contains asphalt-resin oligomers, thermoplastic elastomer, plasticizer, a modifying additive in the following ratio components, wt.%:! Asphalt-resinous compounds 65-85 Thermoelastoplast 6-12 Plasticizer 5-14 Glue AC-M 4-9,! and as an anti-adhesive layer contains films and papers with double-sided siliconized coating, and the anti-adhesive layer covers the impregnated base, at least on one side.

Description

The utility model relates to industrial construction and can be used to protect against corrosion of the outer surfaces of main and oil, gas, product pipelines and pipelines for various purposes and tanks, as well as repair material for isolating damage to the main insulation.

Despite the fact that in recent decades new polymer materials have appeared for the corrosion protection of pipelines: polyethylene, polyvinyl chloride, polypropylene, epoxy resins, etc., the properties of mastic materials based on petroleum polymers as insulating materials do not lose their relevance.

Currently, for the purposes of insulation and corrosion protection, anti-corrosion insulating tapes or roll materials having three layers are used: base, adhesive and anti-adhesive.

The function of corrosion protection is the adhesive layer, usually mastics are used as its layer. The widespread use of mastics as an anti-corrosion material is due to their ductility in a wide temperature range, low permeability, fairly high adhesion, compatibility with almost all types of insulating materials, etc.

The anti-adhesive layer can be made of any material, ensuring that the tape is stored in a roll without sticking, free unwinding of the roll, without sticking to the mastic layer.

The basis of the tape performs the function of a frame carrying an adhesive layer. It also has the function of protecting the adhesive layer during operation.

A number of anti-corrosion tapes are known [RF patent No. 2199051, class. 7 F16L 58/10, priority 04/03/2002; RF patent No. 68644, cl. F16L 59/10 (2006.01), priority 1/17/2007; RF patent No. 51704, class F16L 59/10 (2006.01), priority 31.10.2005, etc.] where the polymeric material is used as the basis: heat-shrinkable, polyvinyl chloride tape, polyethylene terephthalate film. Along with satisfactory adhesive properties, these tapes do not have sufficiently high strength characteristics.

Known anti-corrosion tapes having a reinforced base, for example, as a polymer base tape, use a film of polyethylene or a copolymer of ethylene with vinyl acetate, electronically chemically modified and uniaxially oriented [RF patent No. 50278, class. 7 F16L 58/10, priority 06.06.2005]; a second layer made of metal, for example aluminum, foil fixedly fixed on the outer surface of the first layer of a polymer film can be additionally introduced into the base tape [RF patent No. 30921, cl. 7 F16L 59/10, priority 04.04.2003]. However, the cost of such tapes having high strength characteristics, as a rule, is very high.

Known anti-corrosion insulation tape, the base of which is made of fiberglass [RF patent No. 34689, class. 7 F16L 59/10, priority 09/19/2003], or the fiberglass mesh is a reinforcing mastic layer material [RF patent No. 29572, cl. 7 F16L 58/10, priority 09/17/2002]. The use of a fiberglass or fiberglass fabric as a base tape does not provide stable form-forming qualities of the tape and has insufficient elastic properties, which generally complicates the use of this material when isolating pipelines with complex profile surfaces (welded joints, Butler joints, bends, sleeve joints and etc.).

As an adhesive layer of the above tapes, bitumen-polymer mastics, mastics containing Asmol are used.

The closest technical solution to the claimed utility model is a rolled mastic material [RF patent No. 2379575, F16L 58/12 (2006.01), priority 02/21/2008] containing a basis of polymer tape (multilayer polyethylene, heat-shrinkable polyethylene, polypropylene, polyvinyl chloride); mastic layer containing bitumen, asphalt-resinous compounds, solvent, thermoplastic elastomer, plasticizer, modifying additive. As a release agent in this roll material, a fluoroplastic film or release adhesive siliconized films and papers can be used. The advantages of the known roll material is the high adhesive properties of the mastic layer, which are provided by various additives. The disadvantage is the insufficient elasticity of the base tape and the lack of adhesion to the protective wrapping layer of the insulation coating.

The technical objectives of the utility model are to eliminate the disadvantages of the prototype, by improving the elasticity of the tape itself and the possibility of forming adhesive bonds with the wrapping layer - that is, the formation of an integral insulating coating with through adhesion of the layers.

The stated technical problem is achieved due to the fact that the rolled mastic material, consisting of the main layer, the mastic layer and the release layer, contains the textile base tape, which is impregnated with mastic, as the main layer, while the textile base tape is a geotextile, and the mastic layer contains asphalt-resinous oligomers, thermoplastic elastomer, plasticizer, modifying additives, in the following ratio of components, wt.%:

Asphalt-resinous compounds 65-85 Thermoelastoplast 6-12 Plasticizer 5-14 Glue AC-M 4-9.

In the mastic layer of rolled material, asphalt-resinous compounds use the product of copolymerization of bottoms from isoprene production with ASB of asphalt propane deasphalting tar in the presence of sulfuric acid, which plays the role of a catalyst and a sulfonating agent. The high concentration of paramagnetic centers and the presence of components with a branched system of double bonds, as well as sites with delocalization of π-electrons, mean the possibility of using asphalt-resin oligomers as stabilizers of polymers and plastics in the processes of thermal, photochemical and radiochemical destruction.

As modifying additives use glue AC-M.

AC-M adhesive (anticorrosive adhesive composition) is a solution of a rubber mixture based on butyl rubber and Asmol oil in a gasoline solvent for the rubber industry, has adhesive and anticorrosive properties and is used as an adhesive layer when applying adhesive tapes or when gluing polymeric materials to a metal surface.

Thermoplastic elastomers (thermoplastic elastomers), polymeric materials possessing highly elastic properties typical of elastomers under operating conditions, and reversibly transforming into a plastic or viscous state at elevated temperatures. The properties of thermoplastic elastomers are determined by the peculiarities of their structure - the formation of a two-phase system due to the thermodynamic incompatibility of homopolymers forming rigid thermoplastic blocks (e.g. polystyrene, polyethylene, polybutylene terephthalate, etc.) and elastic blocks (e.g. polybutadiene, polyisoprene, polyoxyalkylene glycol, ethylene copolymers and copolymers etc.) in the macromolecule of thermoplastic elastomers. The absence of chemical bonds between the polymer chains determines their fluidity at elevated temperatures and allows for the use of injection molding, extrusion, vacuum molding, pneumoforming, etc. to obtain products.

Plasticizers are low molecular weight organic substances that, when introduced into the polymer at the stage of its preparation, reduce the interaction between neighboring macromolecules. Plasticizers are introduced into the composition of polymeric materials to impart (or increase) elasticity and (or) plasticity during processing and operation.

Sulfone groups contained in asphalt-resin compounds are an agent providing a high degree of adhesion to the metal surface of the pipeline. Asphalt-resinous compounds ensure the compatibility of this composition with a wide range of materials (roofing, building structures), the ability to apply mastic material to the surface without preheating.

The mastic layer of the proposed roll material contains AC-M adhesive as an additional agent that enhances adhesion by providing primary adhesion of the material to the surface.

Thus, the mastic layer used in the proposed roll material provides stable adhesion over a wide temperature range, makes it possible to use the roll mastic material as a repair material for isolating damage to the main insulation without a high degree of preparation of the metal surface before application, and also ensures reliable filling of heat-affected zones , strengthening of the welded joint (“tent” zones) and places of transition to the main pipeline insulation.

To prevent adhesion of the mastic material in the roll, a release material is applied to the mastic layer. Siliconized release films and papers, which are films and papers coated with an organosilicon (silicone) layer, are used as an anti-adhesive layer in the roll material according to the invention, with silicone coating on both sides, i.e. films and papers with bilateral siliconized coating, which ensures an increase in the operational properties of the mastic material as a whole.

The use of a textile tape as a basis, namely a geotextile fabric, prevents the destruction of the surface layer of the coating, improves the forming properties of the rolled material due to its high elastic properties. Geotextile is a non-woven material consisting of endless polypropylene or polyester fibers having high physical and mechanical characteristics. Geotextile fabric (a type of geotextile) is geosynthetics obtained by thermal or other mechanical bonding of fibers [http://www.rostecnology.ru/].

As mentioned above, the mastic layer of the inventive roll material is not applied to the base, the base is impregnated with a mastic layer. In this case, the mastic layer is slightly transferred to the “back” side of the geo-cloth, so the anti-adhesive layer can be applied both on the one hand and on both sides. The mastic layer is applied to the geotextile web by passing the base tape through the melt of the mastic.

Such a roll material with a base embedded in the mastic layer provides an increase in strength characteristics without affecting the anticorrosion properties of the roll material.

On the surface of the pipe, rolled mastic material is applied both manually, using manual insulating machines, and mechanically - using insulating machines as part of insulating and laying columns.

The operational properties of rolled mastic material based on asphalt-resinous oligomers, in particular anticorrosion properties, are determined by the ductility and adhesion of the material to the surface, which in turn are characterized by the values of such parameters determined by GOST as: tensile strength, (we remove the relative elongation at break, as incorrect in this case), the temperature of brittleness of the mastic layer, adhesion to steel and adhesion in the overlap.

In the course of the research, variants of a roll-mastic material were obtained and tested, from which compositions with the optimal ratio of components that were claimed were selected. The content of the components of the mastic layer in the above examples is indicated in wt.%.

The result is an improvement in operational properties, in particular:

1) The ability to apply anti-corrosion coatings on poorly prepared metal surfaces.

2) Formation of adhesive bonds with both the protected metal surface and with the wrapping materials providing mechanical protection of the anticorrosive layer formed by the rolled mastic material.

3) Stabilization of adhesion with increasing temperature range.

4) Increased adhesion of the rolled mastic material to the metal surface over time.

5) Preservation of high ductility and protective properties during long-term operation.

6) The possibility of using rolled mastic material as a repair material to isolate damage to the main insulation, especially at low temperatures.

7) Ensuring reliable filling of near-weld zones of reinforcement of the welded joint (“tent” zones), places of transition to the main pipeline insulation, pipe joints connected by the Butler method, especially at low temperatures.

8) The possibility of applying material with the use of mechanization.

9) Coating with through adhesion of all isolation words.

Claims (1)

Rolled mastic material, consisting of a base, a mastic layer and a release layer, characterized in that the roll material contains a geotextile impregnated with mastic as a base tape, while the mastic contains asphalt-resin oligomers, thermoplastic elastomer, plasticizer, a modifying additive in the following ratio components, wt.%: Asphalt-resinous compounds 65-85 Thermoelastoplast 6-12 Plasticizer 5-14 Glue AC-M 4-9, and as an anti-adhesive layer contains films and papers with double-sided siliconized coating, and the anti-adhesive layer covers the impregnated base, at least on one side.