ANTI-CORROSION TAPE COMPRISING AT LEAST ONE WOVEN FABRIC

Abstract

The present invention relates to an anti-corrosion tape, in particular for producing a pipe cover, comprising at least one bonding layer, produced from a material selected from the group including at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional woven fabric is at least partially incorporated into the at least one bonding layer.

Description

[0001] Corrosion protection tape comprising at least one fabric

[0002] The present invention relates to a corrosion protection tape, in particular for producing a coating on pipes, a method for its production, its use and a method for achieving corrosion protection on pipes and systems comprising pipes.

[0003] Corrosion protection compositions and corrosion protection systems, for example for pipe systems such as pipelines, but also for other technical systems, are widely known from the state of the art.

[0004] Two-layer tapes for protecting tubular objects from corrosion are known from the prior art. Such corrosion protection tapes are wound around the pipe in such a way that an overlapping area is created in order to achieve a continuous, tight covering of the tubular object. The problem arises particularly in the overlapping area that a leak can form due to insufficient contact between the top side of the tape of the previous winding and the underside of the tape of the subsequent winding, allowing water to enter. The water can cause corrosion along the overlapping area, which is known as spiral corrosion. This is promoted by voids formed during winding adjacent to a tape edge of a previous winding, which are formed by the tape of the subsequent winding covering the tape edge of the previous winding.Similar corrosion problems also occur with the formation of voids when corrosion protection tapes are wrapped over weld beads, which are used to join pipes or to repair pipes. When tapes are applied, wrinkles can also form, preventing sufficient sealing. Wrinkles in the winding of a corrosion protection tape provide points of attack for forces acting during handling and operation of the pipeline, such as those from the soil, and can cause detachment and leaks. In this case, too, the effectiveness of corrosion-inhibiting tapes is limited.

[0005] There is a need to minimize leaks and voids in the overlap area, especially to avoid spiral corrosion, and to reduce wrinkles.

[0006] It is therefore an object of the present invention to provide an improved corrosion protection tape with which the formation of wrinkles and the formation of cavities in the overlap area can be reduced or even avoided.

[0007] This object is achieved by a corrosion protection tape, in particular for producing a coating on pipes, comprising at least one connecting layer, produced from a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer.

[0008] If the term "approximately" is used in the context of the invention in connection with values ​​or value ranges, this is to be understood as a tolerance range that the person skilled in the art considers customary in this field. In particular, a tolerance range of ±20%, preferably of ±10%, and more preferably of ±5% is provided. To the extent that different ranges are specified for specifications and / or definitions in the present invention, the lower limits and the upper limits of the different ranges can be combined with one another with regard to the respective specification and / or the respective definition.

[0009] According to the invention, the corrosion protection tape comprises at least one connecting layer. According to the invention, the at least one connecting layer is made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene. Preferably, the connecting layer comprises a material selected from a group comprising at least one first, preferably depolymerized, butyl rubber with an apparent Brookfield viscosity at 66°C according to DIN EN ISO 2555: 2000-01 in a range from approximately 400,000 mPa • s to approximately 2,000,000 mPa • s and an average molecular weight M w (also called average molar mass or molecular mass) in a range of about 20,000 to about 60,000 and / or at least one first polyisobutylene having an average relative molar mass M vin a range from about 14,000 g / mol, preferably from about 30,000 g / mol, to about 150,000 g / mol, preferably to about 100,000 g / mol, and a Staudinger index J o in a range of about 15 cm 3 / g up to about 70 cm 3 / g, and at least one second butyl rubber and / or at least one second polyisobutylene. The at least one second, preferably at least partially crosslinked butyl rubber preferably has a Mooney viscosity ML(1+3) at 127°C in a range from about 65 MU to about 100 MU according to ISO 289:2005. The at least one second polyisobutylene preferably has a Staudinger index J o in a range of about 75 cm 3 / g up to about 235 cm 3 / g and an average relative molecular mass M vin a range from about 150,000 g / mol, preferably from about 160,000 g / mol, to about 950,000 g / mol, preferably to about 850,000 g / mol. Further preferably, the material of the at least one connecting layer comprises a third butyl rubber and / or a third polyisobutylene. The at least one third, preferably solid, butyl rubber preferably has an average molecular weight M w in a range from about 150,000 to about 2,000,000 and a Mooney viscosity ML(l+8) at 125°C in a range from about 20 MU to about 62 MU, measured according to ISO 289:2005. The at least one third polyisobutylene preferably has an average relative molecular weight M v in a range from about 900,000 g / mol, preferably from about 950,000 g / mol, to about 7,500,000 g / mol, preferably to about 6,500,000 g / mol, and a Staudinger index J o in a range of about 240 cm 3 / g up to about 900 cm 3 / g. Preferably, the at least one connecting layer comprises a material selected from a group comprising at least a first polyisobutylene and / or a first butyl rubber and at least a second polyisobutylene and / or a second butyl rubber. More preferably, the connecting layer comprises a material selected from a group comprising at least a first polyisobutylene and / or a first butyl rubber, at least a second polyisobutylene and / or a second butyl rubber, and at least a third polyisobutylene and / or a third butyl rubber. Particularly preferably, the at least one connecting layer comprises at least a first or at least a second polyisobutylene as well as at least a first or at least a second butyl rubber. Even more preferably, the connecting layer comprises a first, a second and optionally a third butyl rubber, and no polyisobutylene.Even more preferably, the connecting layer comprises a first, a second and optionally a third polyisobutylene, and no butyl rubber. Alternatively, the connecting layer comprises only a second butyl rubber or only a second polyisobutylene. In a further alternative, yet particularly preferred embodiment, the connecting layer comprises only a third butyl rubber or only a third polyisobutylene. In a further alternative embodiment, the at least one connecting layer comprises a material selected from a group comprising at least a second polyisobutylene and / or a second butyl rubber and at least a third polyisobutylene and / or a third butyl rubber, preferably a second polyisobutylene and a third butyl rubber or a third polyisobutylene and a second butyl rubber.However, the connecting layer can also comprise a second and a third polyisobutylene or a second and a third butyl rubber.

[0010] The Staudinger Index J o was formerly also called intrinsic viscosity. It is calculated from the flow time at 20°C through a capillary of an Ubbelohde viscometer using the following formula (Schulz-Blaschke equation):

[0011] Jo = T]sp / c (1 + 0.31 x T| S p) cm 3 / g where t

[0012] "Hsp — (specific viscosity), where t is the flow time of the solution with a Hagenbach-Couette correction, t0 is the flow time of the solvent isooctane with a Hagenbach-Couette correction and c is the concentration of the solution in g / cm 3 The average relative molar mass M v (viscosity average) is calculated using the following formula:

[0013] Polyisobutylenes within the meaning of the present invention are preferably synthesized via cationic polymerization of isobutene (2-methylpropene) in a temperature range between approximately -100°C and approximately 0°C. The temperature influences the molar mass of the polyisobutene produced in this way; the lower the temperature, the higher the molar mass. Typically, boron trifluoride or aluminum trichloride in aqueous or alcoholic solution are used as initiators.

[0014] The at least one first polyisobutylene advantageously has a Staudinger index J o in a range of about 22 cm 3 / g up to about 65 cm 3 / g, and even more preferably a Staudinger index J o in a range of about 25 cm 3 / g up to about 45 cm 3 / g. Preferably, the at least one first polyisobutylene has an average relative molecular weight M v(viscosity average) in a range from about 24,000 g / mol, preferably from about 35,000 g / mol, to about 130,000 g / mol, preferably to about 95,000 g / mol, and more preferably an average relative molar mass M v in a range from about 30,000 g / mol, preferably from about 37,000 g / mol, to about 75,000 g / mol, preferably to about 70,000 g / mol. The at least one first polyisobutylene is advantageously present in an amount in a range from about 28 wt.% to about 60 wt.%, more preferably in an amount in a range from about 33 wt.% to about 50 wt.%, in each case based on the total amount of the at least one connecting layer.

[0015] The at least one second polyisobutylene preferably has a Staudinger index J o in a range of about 106 cm 3 / g up to about 160 cm 3 / g. Preferably, the at least one second polyisobutylene has an average relative molecular weight M vin a range from about 250,000 g / mol to about 600,000 g / mol, preferably up to about 550,000 g / mol. Preferably, the at least one second polyisobutylene is present in an amount in a range from about 10 wt.% to about 35 wt.%, more preferably in an amount in a range from about 13 wt.% to about 28 wt.%, in each case based on the total amount of the at least one connecting layer.

[0016] The at least one third polyisobutylene preferably has a Staudinger index J o in a range of about 400 cm 3 / g up to about 800 cm 3 / g, and even more preferably a Staudinger index J o in a range of about 500 cm 3 / g up to about 700 cm 3 / g. Preferably, the at least one third polyisobutylene has an average relative molecular weight M vin a range from about 1,500,000 g / mol, preferably from about 2,000,000 g / mol, to about 6,000,000 g / mol, preferably to about 5,000,000 g / mol, more preferably in a range from about 3,000,000 g / mol to about 5,000,000 g / mol, preferably to about 4,800,000 g / mol. The at least one third polyisobutylene is advantageously present in an amount in a range from about 1 wt.% to about 20 wt.%, more preferably in an amount in a range from about 2 wt.% to about 10 wt.%, even more preferably in an amount in a range from about 3 wt.% to about 8 wt.%, in each case based on the total amount of the at least one connecting layer.

[0017] The ratio of the at least one first polyisobutylene, i.e. the total amount of the first polyisobutylene used, even if a mixture is present, to the at least one second polyisobutylene, i.e. the total amount of the second polyisobutylene, even if this is present in a mixture, is advantageously in a range from about 2.5:1 to about 1:2.5, more preferably in a range from about 2.2:1 to about 1:1.

[0018] The polyisobutylenes used, i.e., the first, second, and third polyisobutylenes, advantageously have a glass transition temperature Tg (measured calorimetrically by DSC) of less than -50°C, more preferably less than -58°C. The glass transition temperature of the at least one first, the at least one second, and the at least one third polyisobutylene is particularly preferably in a range from about -55°C to about -68°C, more preferably in a range from about -58°C to about -66°C. The higher molecular weight, at least one second polyisobutylene can thus still be considered a highly viscous liquid and exhibits a certain tendency to creep.

[0019] For the purposes of the present invention, the term butyl rubber refers in particular to copolymers or block copolymers of isobutene with approximately 0.5% by weight to approximately 5% by weight of isoprene, based on the total amount of butyl rubber, which are produced in particular by cationic polymerization, more preferably in the solvent methyl chloride. A crosslinking reaction can be initiated via the isoprene used and the carbon-carbon double bonds present therein, which act as functional groups. For the purposes of the present invention, the term butyl rubber also includes in particular halogenated butyl rubbers, especially those that are chlorinated or brominated (chlorobutyl rubber or bromobutyl rubber). Mixtures of several butyl rubbers can also be used, i.e., more than at least one butyl rubber.The at least one first, preferably depolymerized, butyl rubber is preferably obtained by depolymerizing butyl rubbers (HR). The at least one first butyl rubber has a low molecular weight. It is particularly preferably in liquid form at 23°C. In contrast, the at least one third butyl rubber is not depolymerized and has a high molecular weight compared to the first butyl rubber. The at least one third butyl rubber is advantageously in solid form at 23°C.

[0020] The at least one first, preferably depolymerized, butyl rubber preferably has an apparent Brookfield viscosity according to DIN EN ISO 2555: 2000-01 at 66°C in a range from about 600,000 mPa -s to about 1,600,000 mPa -s, more preferably in a range from about 700,000 mPa -s to about 1,500,000 mPa -s. Preferably, the at least one first, preferably depolymerized, butyl rubber has an average molecular weight Mw in a range from about 20,000 to about 60,000. The at least one first, preferably depolymerized, butyl rubber advantageously has the property of undergoing a crosslinking reaction due to the unsaturated carbon-carbon double bonds present therein, even at low temperatures, in particular at room temperatures of, for example, 20°C or 23°C, or even at slightly elevated temperatures of, for example, 40°C to 50°C.Preferably, the first butyl rubber is comprised by the connecting layer in an amount in a range from about 20 wt.% to about 66 wt.%, preferably in an amount in a range from about 28 wt.% to about 60 wt.%, more preferably in an amount in a range from about 33 wt.% to about 50 wt.%, in each case based on the total amount of the at least one connecting layer.

[0021] The at least one second, at least partially crosslinked (hereinafter also referred to as partially pre-crosslinked) butyl rubber, which has a lower proportion of unsaturated bonds than conventional butyl rubbers, preferably has a Mooney viscosity ML(1+3) at 127°C in a range from about 70 MU to about 93 MU, more preferably in a range from about 78 MU to about 91 MU, measured according to ISO 289: 2005 or according to ASTM 1604-04. The specific density of the at least one second, partially crosslinked butyl rubber is advantageously in a range from about 0.5 to about 1.1, preferably in a range from about 0.9 to about 0.98, at a temperature of 25°C according to ASTM D1875 in the 2003 version. More preferably, the second butyl rubber is present in an amount ranging from about 1 wt% to about 20 wt%, more preferably in an amount ranging from about 2 wt% to about 10 wt%.-%, even more preferably in an amount in a range of about 3 wt.% to about 8 wt.%, in each case based on the total amount of the at least one connecting layer, of which at least one connecting layer comprises.

[0022] The at least one third butyl rubber advantageously has an average molecular weight M win a range from about 200,000 to about 1,800,000, more preferably in a range from about 250,000 to about 600,000. Preferably, the at least one third butyl rubber has a Mooney viscosity ML(1+8) at 125°C in a range from about 30 MU to about 60 MU, more preferably in a range from about 40 MU to about 59 MU, even more preferably in a range from about 42 MU to about 58 MU, and even more preferably in a range from about 40 MU to about 55 MU, measured according to ISO 289:2005. The at least one third butyl rubber is advantageously present in an amount in a range from about 10 wt.% to about 50 wt.%, more preferably in an amount in a range from about 35 wt.% to about 46 wt.%, and more preferably in an amount in a range from about 15 wt.% to about 35 wt.%, in each case based on the total amount of the at least one connecting layer, comprised by the at least one connecting layer.

[0023] Advantageously, the at least one third butyl rubber has unsaturation values ​​in a range from about 1 mol% to about 3 mol%, more preferably in a range from about 1.3 mol% to about 2.5 mol%. This means that preferably about 1 mol% to about 3 mol%, more preferably about 1.3 mol% to about 2.5 mol% of unsaturated bonds, i.e., carbon-carbon double bonds, are present as functional groups in at least one third butyl rubber. Particularly preferably, the at least one third butyl rubber is produced by copolymerizing isobutene and isoprene in methyl chloride as solvent. The unsaturation (the degree of unsaturation) of the at least one third butyl rubber can also be about 1.5 mol%, in particular 1.5±0.5 mol%.The at least one connecting layer advantageously comprises the third butyl rubber, and preferably no further butyl rubber and no polyisobutylene, since, with regard to the embedding of the at least one bidirectional fabric, it can easily fill the recesses or free or empty spaces present in the fabric due to its flowability.

[0024] The material used for the connecting layer, comprising at least one butyl rubber and / or at least one polyisobutylene, preferably at least one butyl rubber and no polyisobutylene, more preferably exactly one butyl rubber and no polyisobutylene, is selected with regard to the at least one bidirectional fabric in such a way that it enables embedding thereof. Further preferably, the material of the at least one connecting layer is adjusted in such a way that, when brought together in the form, in particular, of an application to an outer side of the bidirectional fabric, it is capable of penetrating into the recesses and empty spaces in the fabric under the action of pressure and, after passing through the fabric, of forming a layer on the outer side of the fabric opposite the application, which layer has sufficient adhesive strength.The corrosion protection tape thus obtained is capable of creating a good bond to an object to be protected from corrosion, particularly in the form of a coating on pipes, or to an external surface of the preceding winding to achieve full-surface adhesion. Furthermore, the material used is selected such that it at least partially embeds the at least one bidirectional fabric, even under tension during and after application of the corrosion protection tape, and at least partially prevents the material from being squeezed out of the fabric.

[0025] Preferably, in addition to polyisobutylene and / or butyl rubber, the at least one connecting layer comprises at least one filler material, at least one antioxidant, at least one crosslinking agent, at least one hydrocarbon resin, at least one process oil, at least one elastomer, preferably at least one polyethylene, and / or at least one stabilizer. The further constituents mentioned can be added alone or in combination to the at least one connecting layer. Particularly preferably, the at least one connecting layer comprises at least one filler material. The at least one filler material is preferably present in an amount ranging from about 10 wt.%, or about 20 wt.% to about 70 wt.%, more preferably in an amount ranging from about 30 wt.% to about 65 wt.%, even more preferably in an amount ranging from about 33 wt.% to about 50 wt.%, and even more preferably in an amount ranging from about 10 wt.-% to about 25 wt. %, in each case based on the total amount of the at least one connecting layer. The at least one filler material is particularly preferably in powder form or fibrous form, further preferably it is in powder form. The term fibrous in the sense of the present invention also includes filler materials which have a needle-shaped structure. The at least one connecting layer particularly preferably comprises at least a first powdery filler material and at least one second fibrous filler material. With such a combined addition of at least one powdery and at least one fibrous filler material, the fibrous filler material is particularly preferably added in an amount up to a maximum of that of the powdery filler material. A powdery as well as a fibrous filler can be added in an amount ranging from about 10 wt. % to about 40 wt.-%, preferably in an amount in a range of about 12 wt.% to about 25 wt.%, in each case based on the total amount of the at least one connecting layer, in each case be comprised by the at least one connecting layer.

[0026] Particularly preferably, the at least one connecting layer comprises a third butyl rubber, more preferably exclusively at least one third butyl rubber, more preferably exactly one third butyl rubber and no first and / or second butyl rubber, and more preferably also no polyisobutylene. Particularly preferably, the at least one third butyl rubber has unsaturation values ​​in a range from about 1.4 mol% to about 1.8 mol%. Particularly preferably, the at least one third butyl rubber has a Mooney viscosity ML(1+8) at 125°C in a range from about 46 MU to about 56 MU, measured according to ISO 289:2005.

[0027] The corrosion protection tape preferably consists of a bidirectional fabric and a connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, preferably comprising a third butyl rubber and no polyisobutylene, wherein the bidirectional fabric is at least partially embedded in the connecting layer. The corrosion protection tape preferably consists of a bidirectional fabric, a removable protective film, and a connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein the bidirectional fabric is at least partially embedded in the connecting layer.More preferably, the corrosion protection tape consists of a bidirectional fabric, a removable protective film, and a connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein the bidirectional fabric is at least partially embedded in the connecting layer, as well as a supplementary carrier film, in particular one having adhesion-promoting layers on both outer sides, and optionally a second connecting layer arranged on the outer side of the carrier film as viewed from the fabric. "Consists" in the context of the present application means that the corrosion protection tape does not comprise any other layer.

[0028] Preferably, the corrosion protection tape comprises a protective film which is removable, in particular when wrapping a pipe, a pipeline or the like with the corrosion protection tape according to the invention.

[0029] According to the invention, at least one bidirectional fabric is at least partially embedded in the at least one connecting layer. The at least one bidirectional fabric preferably comprises at least one weft yarn and at least one warp yarn. A bidirectional fabric is a fabric with different properties in the direction of the at least one weft yarn and in the direction of the at least one warp yarn. A warp yarn is the thread that is stretched lengthwise on a loom in the weaving mill. In the finished fabric, they lie parallel to the selvedge, while so-called weft yarns run transversely, i.e. essentially at right angles, to the warp yarn. In the production of a textile fabric, a weft yarn is the yarn that lies transversely to the warp yarns stretched in the loom. Weft is the term for the yarn that is pushed back and forth over the warp to create a fabric.Preferably, the at least one weft yarn lies in the transverse direction of the corrosion protection tape. Preferably, the at least one warp yarn lies in the longitudinal direction of the corrosion protection tape and is oriented substantially perpendicular to the weft yarn. The longitudinal direction of the corrosion protection tape preferably corresponds to the winding direction of the corrosion protection tape on a pipe, a tank, or a component of a tank. To reduce the empty spaces that can form when pipes are wrapped with corrosion protection tape, including in the area of ​​weld beads, the inventors have found that the at least one bidirectional fabric must have stiffer, yet more elastic properties in the winding direction of the corrosion protection tape than is the case transverse to the winding direction. Bidirectional fabrics with warp threads having both higher flexural rigidity and higher elongation than the weft threads are therefore preferred.Due to the greater flexural rigidity, elasticity, and elongation of the fabric in the winding direction, the corrosion protection tape wound under tension around the pipe exerts a greater force toward the pipe being wrapped. Due to the softer properties of the fabric with lower flexural rigidity, and thus of the corrosion protection tape transverse to the winding direction, this force results in the corrosion protection tape conforming more closely to the pipe, so that voids in overlap areas or weld beads can be reduced or even completely eliminated. The corrosion protection tape according to the invention can therefore advantageously conform well to the outer contours, particularly of pipes, and thus provide better protection against corrosion, but also prevent spiral corrosion in the overlap area.

[0030] Preferably, the at least one weft yarn and the at least one warp yarn comprise a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyester or natural fibers or a combination of at least two of the mentioned materials. Natural fibers selected from a group comprising jute, linen, cotton or hemp are preferred. Polyethylene is of low strength, hardness and stiffness, but possesses high extensibility and impact resistance as well as low sliding friction. The properties of polypropylene are similar to polyethylene, but it is somewhat harder and more heat-resistant. Polypropylene has excellent resistance to fatigue. Polyamides are characterized by high strength, stiffness and toughness. Many properties of polyamides are largely dominated by the amide groups, which interact with each other via hydrogen bonds.Aramid fibers consist of aromatic polyamides. Their chemical structure consists of long chains of synthetic polyamides in which at least 85% of the amide groups (-CO-NH-) are directly bonded to two aromatic groups. The molecular chains of aramid fibers exhibit high orientation and crystallinity, which gives the fiber good mechanical properties such as tensile strength and good dimensional stability. The polyester family is a large group of materials, some of which have very different properties. Polyethylene terephthalates (PET) are particularly preferred. Due to their high tensile strength combined with low extensibility and hardness, jute fibers are particularly suitable for the production of coarse, strong, and durable yarns. Linen fibers are stiff and tear-resistant. Due to its low elasticity, linen is prone to creasing, but its tear resistance makes it durable.Cotton is a natural fiber of plant origin with a chemical structure based on cellulose. Cotton has a high moisture absorption capacity. The breaking strength of hemp fibers is slightly higher than that of the comparable flax fiber, with a tensile strength of approximately 350 N / mm. 2 Extensibility, on the other hand, is only two to three percent, and flexibility depends on the bundle structure and the fineness of the fibers. Strength and flexibility in yarns are increased by spinning hemp and flax fibers together, thus utilizing the properties of both fibers. The weft yarn is preferably made of polypropylene, and the warp yarn of polyethylene, polypropylene, or polyester, especially polyethylene terephthalate.

[0031] Preferably, the at least one fabric has a tear strength according to DIN EN ISO 13934-1 in a transverse direction of the at least one bidirectional fabric in a range between approximately 200 N / 5 cm and approximately 2500 N / 5 cm, more preferably in a range between approximately 200 N / 5 cm and approximately 1400 N / 5 cm, further preferably in a range between approximately 250 N / 5 cm and approximately 1200 N / 5 cm, particularly preferably in a range between approximately 300 N / 5 cm and approximately 1000 N / 5 cm, and most preferably in a range between approximately 1600 N / 5 cm and approximately 2400 N / 5 cm. According to DIN EN ISO 139434-1, for the tear strength measurement, the width of each test specimen must be 50 mm ± 0.5 mm (without edges), and its length must be dimensioned such that a measuring length of 200 mm is possible.Preferably, the at least one fabric has an elongation in the transverse direction according to DIN EN ISO 13934-1 in a range between approximately 2% and approximately 100%, more preferably in a range between approximately 10% and approximately 80%, particularly preferably in a range between approximately 20% and approximately 60%, and even more preferably in a range between approximately 10% and approximately 24%. More preferably, the at least one fabric with a jute weft yarn has an elongation of approximately 2% in the transverse direction. More preferably, the at least one fabric with a cotton weft yarn has an elongation of approximately 20% in the transverse direction.Preferably, the at least one fabric has an average flexural rigidity according to the beam method in accordance with DIN 53121:2014-08 in a transverse direction of the at least one bidirectional fabric in a range between approximately 0.1 N*mm and approximately 0.8 N*mm, more preferably in a range between 0.15 N*mm and approximately 0.75 N*mm, particularly preferably in a range between 0.18 N*mm and approximately 0.70 N*mm, and even more preferably in a range between 0.2 N*mm and approximately 0.50 N*mm. In the present invention, the average flexural rigidity was measured using the beam method in accordance with DIN 53121:2014-08 using samples with a sample width of approximately 30 mm, a gauge length of approximately 10 mm, a maximum bending angle of approximately 7.5°, and a deformation rate of approximately 0.02° / s.The at least one fabric has, in particular with regard to the above value ranges for the average bending stiffness, sufficient conformability in the transverse direction and avoids the formation of cavities in the overlap region during the winding of the corrosion protection tape according to the invention around a pipe, a pipeline or the like, or reduces the formation of these cavities or empty spaces, just as is the case with unevenness on a pipe, for example in the case of weld beads.

[0032] The weft yarn is preferably ribbon-shaped. More preferably, the weft yarn is fibrillated. Fibrillated weft yarn, especially in the form of ribbons, has lower flexural rigidity than non-fibrillated weft yarn. The weft yarn is preferably a twisted yarn. A twisted yarn is a yarn consisting of several twisted yarns. A twisted yarn has a significantly higher tensile strength than all untwisted single yarns combined. Twisted yarns are mechanically resistant. The warp yarn is preferably a monofilament.

[0033] The twist direction of the weft yarn is preferably Z or S. The yarn has a Z twist direction if the fibers in the yarn, when held vertically, run in the direction of the slash of the letter Z. If it runs in the opposite direction, it is an S twist.

[0034] The weft yarn is preferably a core-spun yarn. Core-spun yarns have a two-part structure with a core and sheath. The core preferably comprises polyethylene, and the sheath more preferably comprises polypropylene.

[0035] Preferably, the weft yarn is produced using a core spinning process. A core spinning process allows filaments to be covered with staple fibers during yarn production. A ring spinning machine is modified so that a core can be produced together with a sheath during twisting.

[0036] Preferably, the at least one weft yarn has a linear density in a range from about 60 tex to about 140 tex, more preferably from about 70 tex to about 130 tex, and most preferably from about 80 tex to about 120 tex. The linear density is specified as weight per unit length. The derived unit "tex" describes the yarn count in grams / kilometer.

[0037] Preferably, the at least one fabric has a tear strength according to DIN EN ISO 13934-1 in a longitudinal direction of the at least one bidirectional fabric in a range between approximately 400 N / 5 cm and approximately 4000 N / 5 cm, further in a range between approximately 190 N / 5 cm and approximately 3000 N / 5 cm, more preferably in a range between 300 N / 5 cm and approximately 2800 N / 5 cm, particularly preferably in a range between 500 N / 5 cm and approximately 2500 N / 5 cm, and most preferably in a range between 1350 N / 5 cm and approximately 2200 N / 5 cm. Preferably, the at least one fabric has an elongation in the longitudinal direction according to DIN EN ISO 13934-1 in a range between about 2% and about 100%, more preferably between about 10% and about 80%, particularly preferably between about 20% and about 75%, and most preferably between about 28% and about 70%, even more preferably up to about 60%.Preferably, the at least one fabric has an average flexural rigidity according to the beam method in accordance with DIN 53121:2014-08 in a longitudinal direction of the at least one bidirectional fabric in a range between approximately 0.2 N*mm and approximately 1.5 N*mm, more preferably in a range between 0.3 N*mm and approximately 1.4 N*mm, particularly preferably in a range between 0.4 N*mm and approximately 1.5 N*mm. The properties of the at least one warp yarn prevent the corrosion protection tape from wrinkling when applied to a pipe. The tear strength in the longitudinal direction of the at least one bidirectional fabric significantly influences the winding ability and final performance of the tape. The corrosion protection tape with such a fabric meets the requirements of NACE SP0109-2019 (> 192.5 N / cm according to ASTM D1000). The properties of at least one warp yarn and the fabric give the corrosion protection tape strength and dimensional stability.Thanks to the strength and dimensional stability of the corrosion protection tape during use, for example during pipe movement and the transfer of forces from the surrounding soil, wrinkling is avoided. Wrinkling is also avoided during application of the corrosion protection tape thanks to the strength and dimensional stability of the corrosion protection tape. In addition, with regard to the specified weir ranges for the average bending stiffness in the longitudinal direction, which is preferably higher than the average bending stiffness in the transverse direction, it is ensured that a sufficient force is exerted on a pipe, for example, when wound under tension. This means that due to the lower average bending stiffness in the transverse direction, the corrosion protection tape can conform better to the pipe and follow its outer contour, thus reducing or even preventing empty spaces or cavities.

[0038] Preferably, the at least one warp yarn has a linear density in a range from about 20 tex to about 100 tex, more preferably from about 30 tex to about 90 tex, particularly preferably from about 40 tex to about 80 tex.

[0039] Preferably, the at least one bidirectional fabric has a tensile strength ratio in the transverse direction to the longitudinal direction in a range between about 2:1 and about 1:20, preferably in a range between about 1:1.1 and about 1:15, more preferably in a range between about 1:3 and about 1:12, particularly preferably in a range between about 1:5 and about 1:9, and even more preferably in a range between about 1.5:1 and about 1:2. Preferably, the at least one warp yarn has a higher tensile strength than the at least one weft yarn.

[0040] Preferably, the at least one bidirectional fabric has a stretch ratio in the transverse direction to the longitudinal direction in a range between about 0.5 and about 2, more preferably in a range between about 0.7 and about 1.8, particularly preferably in a range between about 0.9 and about 1.6, and even more preferably in a range between about 0.5 and about 1.6.

[0041] Preferably, the at least one bidirectional fabric has a ratio of an average flexural rigidity according to the beam method in accordance with DIN 53121:2014-08 in the transverse direction to the longitudinal direction in a range between approximately 1:1.1 and approximately 1:8, more preferably between approximately 1:1.3 and approximately 1:8, further preferably in a range between approximately 1:1.5 and approximately 1:6, particularly preferably in a range between approximately 1:1.7 and approximately 1:4. In the above-specified value ranges for the average flexural rigidity, which is always higher in the longitudinal direction than in the transverse direction of the corrosion protection tape, based on its winding direction, the latter has excellent conformability to an outer contour of a surface, so that, just as in overlapping areas when wrapping a tubular object, empty spaces or cavities are reduced or even avoided, thus improving the corrosion protection of the protected objects.

[0042] Preferably, the at least one bidirectional fabric comprises between about 30 and about 90 weft yarns per 10 cm, more preferably between about 40 and about 80 weft yarns per 10 cm, most preferably between about 50 and about 70 weft yarns per 10 cm, and most preferably between about 50 and about 110 weft yarns per 10 cm, and even more preferably between about 60 and about 110 weft yarns per 10 cm. Preferably, the at least one bidirectional fabric comprises between about 120 and about 190 warp yarns per 10 cm, more preferably between about 130 and about 180 warp yarns per 10 cm, most preferably between about 140 and about 170 warp yarns per 10 cm, and even more preferably between about 145 and about 190 warp yarns per 10 cm. The number of yarns depends on the yarns used and their properties as well as on the pipes, pipelines and the like to be wrapped.If the warp yarn is very stiff, fewer yarns are required than if the warp yarn is less stiff. The number of yarns may also depend on the diameter of the pipe to be wrapped.

[0043] Preferably, the at least one bidirectional fabric has a thickness in a range between about 0.2 mm and about 2 mm, more preferably in a range between about 0.3 mm and about 2.8 mm, particularly preferably in a range between about 0.5 mm and about 2.5 mm, and even more preferably in a range between about 0.5 mm and about 1 mm. Preferably, the at least one bidirectional fabric has a 1 / 1 plain weave.

[0044] According to the invention, at least one bidirectional fabric is at least partially embedded in the at least one connecting layer. Embedded, in the sense of the present application, means bound, incorporated or integrated into a larger whole. The at least one fabric is embedded in a connecting layer if the at least one fabric to be embedded is arranged within the connecting layer and is therefore surrounded by material. Alternatively, the at least one fabric is partially embedded in a connecting layer such that the at least one fabric is at least partially visible or exposed on one or both surfaces of the connecting layer. This is the case if the recesses or free spaces between the yarns present in the fabric are essentially completely filled with the material of the connecting layer.In this case, no fabric may be visible or exposed on one surface of the connecting layer, thus the corresponding side of the fabric may be completely covered with the material of the connecting layer, while on the opposite surface of the connecting layer the fabric is at least partially visible or exposed, thus essentially filling the free spaces in the fabric with the material of the connecting layer. Alternatively, the fabric may also be at least partially visible or exposed on both surfaces of the connecting layer. Preferably, between approximately 50% and approximately 99% of the outer surface of the bidirectional fabric is embedded in the at least one connecting layer, more preferably between approximately 60% and approximately 90%, particularly preferably between approximately 70% and approximately 80%. Preferably, the at least one bidirectional fabric is completely embedded in the at least one connecting layer.In this embodiment, the connecting layer is present on both sides of the at least one bidirectional fabric and completely covers it. Preferably, the connecting layer is arranged on both outer sides of the fabric and embeds the fabric therein. Further preferably, the fabric is embedded asymmetrically in the connecting layer, with its thickness being greater on one outer side of the fabric than on the opposite side.

[0045] The corrosion protection tape according to the invention is preferably wound under tension. As already described above, wrinkles, particularly in the overlapping area, and empty spaces in the overlapping area are reduced or even eliminated by the corrosion protection tape. This is possible thanks to the bidirectional fabric. The at least one fabric is conformable in the transverse direction and stiffer in the longitudinal direction. Furthermore, the corrosion protection tape according to the invention improves the bond in the overlapping area of ​​the winding between the upper surface or the top side of the corrosion protection tape of the previous winding and the lower surface or the underside of the corrosion protection tape of the subsequent winding. By reducing or eliminating the voids at the overlapping step, the surface of the pipeline is also better wetted or covered.

[0046] The present invention further relates to a method for producing a corrosion protection tape as described above, wherein at least one fabric is joined to at least one connecting layer. Preferably, the at least one fabric is joined to the at least one connecting layer by a calender, preferably under pressure. In the method according to the invention, the at least one fabric is preferably at least partially, more preferably completely, embedded in the at least one connecting layer. Preferably, the connecting layer is brought together in the calender with the band-shaped bidirectional fabric on a first outer side thereof, and the calender presses the material of the connecting layer through the recesses or free spaces in the fabric tape, filling them and thus embedding the fabric in the connecting layer.Preferably, the material of the connecting layer is pressed beyond the free spaces in the fabric onto a second outer side of the fabric opposite the first outer side and forms there a sufficiently adhesive layer to form a direct connection with the object to be protected from corrosion or, if necessary, to be connected to a carrier layer.

[0047] Preferably, the material of the at least one connecting layer is produced using an internal mixer and rolled out in a calendering process, where it is joined to the at least one fabric. During the mixing process, the at least one connecting layer preferably has a temperature in a range from approximately 60°C to approximately 170°C, more preferably in a range from approximately 80°C to approximately 120°C, and most preferably in a range from approximately 90°C to approximately 110°C.

[0048] The present invention further relates to the use of a corrosion protection tape for protecting pipes and systems comprising pipes, tanks, and tank components. A pipe or tubular body is a long, cylindrical hollow body primarily used to convey gases, liquids, and solids. A pipe can be, for example, a water pipe or district heating pipe, or a component of a pipeline. Components of tanks include, for example, tank bottoms, metal containers, fittings, and tank connections such as inlets and outlets. The corrosion protection tape can be used alone or in combination with another corrosion protection tape.

[0049] The present invention further relates to a method for achieving corrosion protection on pipes and systems, tanks, and tank components comprising pipes, using an at least two-layer corrosion protection tape, wherein the pipe is wrapped with the corrosion protection tape in an overlapping manner such that a continuous coating can be formed. The corrosion protection tape is preferably wrapped with tension. The corrosion protection tape is preferably wound with a tensile force in a range between approximately 2 N / cm to approximately 50 N / cm, more preferably between approximately 5 N / cm to approximately 40 N / cm, and particularly preferably between approximately 10 N / cm to approximately 30 N / cm. This high tension also leads to high pressure forces of the corrosion protection tape on the surface of the object to be wrapped.This in turn promotes the fusion of the connecting layer of the upper layer of the corrosion protection tape with the connecting layer of the lower layer of the corrosion protection tape in the overlapping area, so that together they can form a continuous layer in which the fabric is completely embedded.

[0050] The present invention further relates to a pipe, tank, or component of a tank comprising a corrosion protection tape according to the invention, wherein more preferably the pipe, the tubular object, the pipeline, the pipes of the system comprising pipes, the tank, or the component of a tank, as well as other systems and fittings, are wrapped with the corrosion protection tape, preferably overlapping, more preferably spirally, or the corrosion protection tape according to the invention is applied to a surface of the said components. Finally, the present invention relates to the use of a bidirectional fabric as defined above in a corrosion protection tape as described above, preferably embedded in at least one connecting layer, preferably in exactly one connecting layer.

[0051] An exemplary corrosion protection tape, in particular for producing a coating on pipes such as pipelines, comprises at least one connecting layer, produced from a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one weft yarn and wherein the at least one weft yarn comprises a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyesters, natural fibers or a combination of at least two of the materials mentioned.

[0052] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one warp yarn and wherein the at least one warp yarn comprises a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyesters, natural fibers or a combination of at least two of the materials mentioned.

[0053] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, produced from a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one warp yarn and at least one weft yarn, and wherein the at least one warp yarn and the at least one weft yarn comprise a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyesters, natural fibers or a combination of at least two of the materials mentioned.

[0054] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one warp yarn and at least one weft yarn, wherein the at least one fabric has a tear strength in a transverse direction according to DIN EN ISO 13934-1 in a range between approximately 200 N / 5 cm and approximately 2500 N / 5 cm and wherein the at least one warp yarn has a tear strength according to DIN EN ISO 13934-1 in a range between approximately 400 N / 5 cm and approximately 4000 N / 5 cm.

[0055] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, produced from a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one warp yarn and at least one weft yarn, wherein the at least one fabric has an elongation in the transverse direction and longitudinal direction according to DIN EN ISO 13934-1 in a range between approximately 2% and approximately 100%, preferably in the transverse direction in a range between approximately 10% and approximately 24% and in the longitudinal direction in a range between approximately 28% and approximately 60%.

[0056] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer, wherein the at least one bidirectional fabric has a tear strength ratio in the transverse direction to the longitudinal direction in a range between approximately 2:1 and approximately 1:20.

[0057] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially, preferably completely, embedded in the at least one connecting layer, wherein the at least one bidirectional fabric has a ratio of an average flexural rigidity according to the beam method according to DIN 53121:2014-08 in the transverse direction to the longitudinal direction in a range between approximately 1:1.3 to 1:8. Preferably, the weft yarn is formed from ribbons, more preferably fibrillated ribbons, and the warp yarn is formed from monofilaments. More preferably, the weft yarn is formed from polypropylene and the warp yarn is formed from polyethylene or polyesters, in particular polyethylene terephthalate.More preferably, the bidirectional fabric has 60 to 110 weft threads per 10 cm and 145 to 190 warp yarn threads per 10 cm.

[0058] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, produced from a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is completely embedded in the at least one connecting layer, wherein the at least one bidirectional fabric comprises at least one warp yarn and at least one weft yarn, and wherein the at least one warp yarn and the at least one weft yarn comprise a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyesters, natural fibers or a combination of at least two of the materials mentioned.

[0059] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is completely embedded in the at least one connecting layer, wherein the at least one bidirectional fabric has a tear strength ratio in the transverse direction to the longitudinal direction in a range between approximately 2:1 and approximately 1:20.

[0060] Another exemplary corrosion protection tape, in particular for producing a coating on pipes or pipelines, comprises at least one connecting layer, made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is completely embedded in the at least one connecting layer, wherein the at least one bidirectional fabric has a ratio of an average flexural rigidity according to the beam method according to DIN 53121:2014-08 in the transverse direction to the longitudinal direction in a range between approximately 1:1.3 to 1:8.

[0061] The above-mentioned preferred embodiments of the invention are non-limiting, but nevertheless preferred examples. A combination of the mentioned areas and components of each embodiment with one or more other embodiments is also possible.

[0062] The present invention is explained in more detail using the following embodiments.

[0063] A first corrosion protection tape was produced. A bonding layer comprised approximately 40 wt.%, based on the total amount of the bonding layer, of a third butyl rubber with a Mooney viscosity ML(1+8) at 125°C in a range from approximately 46 MU to approximately 56 MU and an unsaturation in a range from approximately 1.4 mol% to approximately 1.8 mol%. The bonding layer comprised various additives. The additives comprised approximately 60 wt.%, based on the total amount of the bonding layer. A fabric to be at least partially embedded in the bonding layer comprised polypropylene weft yarns and polyethylene warp yarns. The embedding took place over approximately 70% of the surface of the fabric, thus approximately 30% of the fabric was exposed and visible. The weft yarn was tape-shaped. A monofilament was used as the warp yarn. The fabric had a tear strength according to DIN EN ISO 13934-1 of over 900 N / 5cm in the transverse direction and over 1400 N / 5cm in the longitudinal direction.The ratio between the tensile strengths in the transverse direction and the longitudinal direction was 1:1.55. The fabric exhibited an elongation of over 15% in both the transverse and longitudinal directions according to DIN EN ISO 13934-1. The elongation ratio of the weft yarn to the warp yarn was 1:1. The weft yarn had a thread count of 64 per 10 cm. The warp yarn had a thread count of 156 per 10 cm. The yarn count ratio in the transverse direction to the longitudinal direction was 1:2.4. The bidirectional fabric exhibited an average flexural stiffness according to the beam method according to DIN 53121:2014-08 of approximately 0.398 N*mm in the transverse direction and approximately 0.770 N*mm in the longitudinal direction. The bidirectional fabric had a mean flexural stiffness ratio of approximately 1:1.93 in the transverse direction to the longitudinal direction, according to the beam method according to DIN 53121:2014-08. The fabric was joined to the bonding layer in a calender.The corrosion protection tape was wound on pipes with an overlap of approximately 50% of the width of the corrosion protection tape and with tension, in particular a tensile force of at least approximately 20 N / cm. Since tension is applied when winding the tape onto a pipe, few or no wrinkles were formed and an improved bond was achieved in the overlap area.

[0064] A second corrosion protection tape was manufactured. The connecting layer was made of the same material as in the first corrosion protection tape, and was also manufactured in a calender, but at a higher pressure. The fabric used was a polypropylene tape with 100 weft threads per 10 cm and a polyethylene monofilament with 156 warp threads per 10 cm. The elongation ratio of the weft yarn to the warp yarn was 1.4:1. The fabric was fully embedded in the connecting layer. The bidirectional fabric exhibited an average flexural stiffness according to the beam method according to DIN 53121:2014-08 of approximately 0.45 N*mm in the transverse direction and approximately 1.4 N*mm in the longitudinal direction. The bidirectional fabric had a ratio of average bending stiffness according to the beam method according to DIN 53121:2014-08 in the transverse direction to the longitudinal direction of approximately 1:3.11.When wound on a pipe according to the first corrosion protection tape, the empty spaces or cavities in the overlap area could be further reduced compared to the first corrosion protection tape.

Claims

Patent claims 1. Corrosion protection tape, in particular for producing a coating on pipes, comprising at least one connecting layer made of a material selected from a group comprising at least one butyl rubber and / or at least one polyisobutylene, wherein at least one bidirectional fabric is at least partially embedded in the at least one connecting layer.

2. Corrosion protection tape according to claim 1, characterized in that at least one bidirectional fabric is completely embedded in the at least one connecting layer.

3. Corrosion protection tape according to claim 1 or 2, characterized in that the at least one bidirectional fabric comprises at least one weft yarn and at least one warp yarn and that the at least one weft yarn and / or the at least one warp yarn comprise a material selected from a group comprising polypropylene, polyethylene, polyamides, aramid fibers, polyesters, natural fibers or a combination of at least two of the materials mentioned.

4. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one fabric in the transverse direction and / or in the longitudinal direction of the at least one bidirectional fabric has an elongation according to DIN EN ISO 13934-1 in a range between approximately 2% and approximately 100%.

5. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a tear strength according to DIN EN ISO 13934-1 in the transverse direction of the at least one bidirectional fabric in a range between approximately 200 N / 5 cm and approximately 2500 N / 5 cm.

6. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a tear strength according to DIN EN ISO 13934-1 in the longitudinal direction of the at least one bidirectional fabric in a range between approximately 400 N / 5 cm and approximately 4000 N / 5 cm.

7. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a tear strength ratio in the transverse direction to the longitudinal direction in a range between about 2:1 and about 1:

20.

8. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a flexural rigidity according to the beam method according to DIN 53121:2014-08 in the longitudinal direction of the at least one bidirectional fabric in a range between approximately 0.2 N*mm and approximately 1.5 N*mm.

9. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a flexural rigidity according to the beam method according to DIN 53121:2014-08 in the transverse direction of the at least one bidirectional fabric in a range between approximately 0.1 N*mm and approximately 0.8 N*mm.

10. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a ratio of a flexural rigidity according to the beam method according to DIN 53121:2014-08 in the transverse direction to the longitudinal direction in a range between approximately 1:1.1 and approximately 1:

8.

11. Corrosion protection tape according to one or more of the preceding claims, characterized in that the at least one bidirectional fabric has a thickness in a range between approximately 0.2 mm and approximately 2 mm.

12. A method for producing a corrosion protection tape according to one or more of the preceding claims, wherein at least one fabric is joined to at least one connecting layer.

13. Use of a corrosion protection tape according to one or more of claims 1 to 11 for protecting pipes and systems comprising pipes, tanks, and tank components.

14. Process for producing corrosion protection on pipes and pipe-comprising installations, tanks and components of tanks with at least two layers Corrosion protection tape according to one or more of claims 1 to 11.

15. Pipe, tank or component of a tank with a corrosion protection tape according to one or more of claims 1 to 11.

16. Use of a bidirectional fabric as defined in claims 3 to 11 in a corrosion protection tape according to any one of claims 1 to 11.