JP4949879B2 - Tank lining construction method and tank inner surface lining structure - Google Patents

Description

  The present invention relates to an inner surface lining construction method for a fuel or solvent tank and an inner surface lining structure.

  In gas stations and the like, various fuel tanks such as gasoline tanks and light oil tanks are widely used mainly in the form of underground type. In various industrial fields, for example, solvent tanks such as ethanol, toluene and hydrochloric acid are installed.

  For example, in the case of a fuel tank, such a tank may deteriorate over time for 20 years or 30 years and may cause corrosion or pitting corrosion on the tank wall. There are similar circumstances of aging in solvent tanks. In such a case, oil leakage or solvent leakage occurs from the tank wall and causes soil contamination or environmental contamination.

  Therefore, after a new tank is installed, the inner surface of the tank is repaired at an appropriate age after checking for leaks using an appropriate method.

  In recent years, in such lining repairs, an FRP layer (fiber reinforced plastics layer) is often formed as a barrier layer that suppresses permeation of fuel / solvent and moisture contained therein. The FRP layer is also a structural element for providing the lining layer with a certain thickness and physical strength.

In JP-A-2002-211165, the above-mentioned Patent Document 1 performs primer coating on the inner surface of an aging existing fuel tank after performing a certain pretreatment such as a base cleaning treatment, and then unsaturated. A fuel tank repair method for forming an FRP layer using a polyester resin as a matrix is disclosed.

Patent No. 3594183 In the above-mentioned Patent Document 2, after preliminary check and pretreatment for the buried fuel tank, primer coating, first step FRP lining for the lower part and middle part of the buried tank, An FRP lining construction method for sequentially performing the second step FRP lining on the upper part of the buried tank is disclosed. This Patent Document 2 does not describe the type of matrix material for the FRP layer. In addition, there is a disclosure that “sandblasting is performed as pretreatment” in the sense of mere cleaning.

  However, the FRP lining according to the above-described prior art does not necessarily have a sufficient barrier effect for suppressing the permeation of fluid such as fuel, solvent or moisture.

  Moreover, there are concerns about the following circumstances in the fuel tank. That is, in recent years, ETBE (ethyl tertiary butyl ether) mixed gasoline, bioethanol mixed gasoline (E3), biodiesel fuel ( BDF) and other alcohol / ether-based fuels (hereinafter simply referred to as “mixed fuels”) are expected to increase in use.

  As is well known, alcohol and ether have remarkably high material permeability compared to gasoline and light oil and the like, and in the FRP lining according to the above prior art, the reduction of the barrier function with respect to the mixed fuel is particularly remarkable. Conceivable.

  Furthermore, in the FRP lining according to the above prior art, the resin material constituting the lining layer has insufficient resistance (corrosion resistance) to the fuel and solvent. Aged deterioration of the barrier function against fluid is also considered to be large.

  In such a lining structure that lacks the barrier function and resistance to the fluid in the tank, gasoline fuel, mixed fuel, solvent or moisture penetrates the barrier layer and reaches the primer layer, so that the constituent material of the primer layer (for example, Polyethylene) may melt out. As a result, first, delamination between the primer layer and the FRP lining layer is promoted, and second, delamination between the base (inner wall surface of the tank) and the primer layer is promoted. Further, there is a problem in that gasoline fuel, mixed fuel, and solvent are promoted to leak out of the tank, and the aging of the tank wall portion further proceeds despite the lining.

  Furthermore, moisture contained in these fuels and solvents may penetrate the barrier layer and cause the same problem.

  The first countermeasure to effectively deal with these problems is to significantly reduce the permeability of the barrier layer to fuel and solvent. The second countermeasure is to improve the durability of the entire lining against fuel and solvent. A third countermeasure is to maintain the bonding strength between the primer layer and the barrier layer or the bonding strength between the base and the primer layer at a high level. The inventor of the present application has completed the present invention by specifically investigating the contents of these measures.

(First invention)
The configuration of the first invention of the present application for solving the above-described problem includes a tank lining construction method including at least the following steps (1) to (3) for repairing the inner surface of a fuel or solvent tank: It is.
(1) The surface treatment process of the tank inner surface.
(2) A primer coating process for forming a primer layer.
(3) A composite barrier comprising one or more fiber-reinforced resin sheet layers (FRP layers) and one or more flake-containing resin sheet layers in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction. A barrier layer forming step of forming a layer;

  In the first invention, the fiber-reinforced resin sheet layer is a matrix with respect to a mat-like fiber sheet (for example, a known glass fiber mat-like sheet called “chopped strand mat” or “glass surfacing mat”). A material that is cured after impregnating a molten resin as a material, and gives a certain thickness and physical strength to the lining.

  According to the first invention, the composite barrier layer including the FRP layer and the flake-containing resin sheet layer is formed after the base treatment step and the primer coating. In the flake-containing resin sheet layer, a flat fluid-impermeable flake material is oriented and dispersed in the layer direction.

  FIG. 1 (a) shows a schematic illustration of the FRP layer 1, and FIG. 1 (b) shows a schematic illustration of the flake-containing resin sheet layer 2, respectively. In the FRP layer 1, a fiber sheet in which a large number of thin reinforcing fibers 4 are woven is embedded in a matrix resin 3.

  On the other hand, in the flake-containing resin sheet layer 2, this layer may not be formed too thick (usually within a range of the thickness of about 0.1 to 0.6 mm). In FIG. 5, a large number of flat flake materials 6 are oriented and dispersed substantially parallel to the layer direction. FIG. 2 (a) shows an enlarged cross-sectional photograph of an example of the flake-containing resin sheet layer 2. A large number of flat flake materials 6 (the flake material 6 is shown in a linear shape because of the cross-sectional photograph). It can be clearly observed that the particles are oriented and dispersed almost parallel to the layer direction.

  As understood at a glance from these figures, when water, alcohol, gasoline, light oil, various solvents, and the like try to permeate the FRP layer 1, the permeation resistance by the elongated reinforcing fibers 4 is limited. On the other hand, when trying to permeate the flake-containing resin sheet layer 2, it is necessary to bypass the fluid-impermeable flat flake material 6 oriented perpendicular to the permeation direction, so that the permeation path is As shown by a broken line in FIG. 2B, a zigzag roundabout path is formed (this operation is hereinafter referred to as “maze effect”).

  Due to such a labyrinth effect, the flake-containing resin sheet layer 2 exhibits an extremely large barrier effect against the permeation of the fluid, and as a result, the fluid permeability of the barrier layer is significantly reduced. As a result, when the tank lining construction method of the first invention is carried out, the fluid does not easily reach the primer layer, so that the delamination between the primer layer and the composite barrier layer is prevented, and the delamination between the underlayer and the primer layer is also prevented. The Then, leakage of gasoline fuel, mixed fuel, solvent, etc. from the tank and deterioration of the tank wall over time are effectively prevented.

  In addition, the fixed thickness and physical strength in the lining layer as an underground tank structure material are ensured by one or two or more FRP layers.

(Second invention)
The configuration of the second invention of the present application for solving the above problem is a tank lining construction method in which the flake-containing resin sheet layer according to the first invention is formed as a lining surface layer that is a layer in contact with the fluid in the tank.

  By forming the flake-containing resin sheet layer having a large fluid barrier property as a lining surface layer in contact with the fluid in the tank as in the second invention, the function is exhibited particularly effectively.

(Third invention)
The configuration of the third invention of the present application for solving the above problem is a tank lining construction method in which the flake-containing resin sheet layer according to the first invention or the second invention is formed on the primer layer.

  As in the third invention, it is also preferable to form the flake-containing resin sheet layer on the primer layer. In this case, it can be expected that the permeation of water, gasoline, mixed fuel, solvent, etc. is blocked immediately before the primer layer.

(Fourth invention)
The configuration of the fourth invention of the present application for solving the above problems is a tank lining construction method in which construction is performed in the following order (a) to (f) on the inner surface of the tank according to the first to third inventions. It is.
(A) Ground treatment process (b) Primer coating process.
(C) The process of forming a 1st flake containing resin sheet layer.
(D) A step of forming one or more fiber-reinforced resin sheet layers.
(E) A step of forming a surface mat layer.
(F) A step of forming a second (innermost layer) flake-containing resin sheet layer.

  In the fourth invention, the “surface mat layer” is one type of fiber reinforced resin sheet layer that is optionally added as necessary, and is a mat-like fiber sheet as compared with a normal fiber reinforced resin sheet layer. This is a product in which the quantitative ratio of the matrix resin is increased. Therefore, in the fourth invention, a configuration in which the surface mat layer is omitted is also conceivable.

  As one of the standard embodiments of the tank lining construction method according to the present invention, the tank lining construction method of the fourth invention can be exemplified.

(Fifth invention)
The structure of the fifth invention of the present application for solving the above-described problem is that one or more of the flake-containing resin sheet layer, the fiber-reinforced resin sheet layer, and the surface mat layer according to the first to fourth inventions are formed. This is a tank lining construction method in which the matrix resin is a resin selected from the group of fuel oil resistant and solvent resistant resin materials including at least a vinyl ester resin.

  As described above with reference to Patent Document 1, an unsaturated polyester resin is used as a matrix in an FRP layer or the like in conventional lining construction. However, unsaturated polyester resins have insufficient durability against fuels, mixed fuels, solvents, etc., and are liable to cause a decrease in fluid impermeability and weakening of the lining layer structure due to deterioration of the lining layer itself.

  By using a matrix resin excellent in fuel oil resistance and solvent resistance such as vinyl ester resin, durability against fuel, mixed fuel, solvent, etc. can be secured, and as a result, fuel oil permeability resistance and solvent resistance resistance can be secured. .

  Therefore, especially when the matrix of the flake-containing resin sheet layer is a vinyl ester resin or the like, an extremely large fluid barrier property is secured in synergy with the labyrinth effect of the flat flakes described above. According to the data obtained by the present inventor, the water vapor transmission coefficient of the unsaturated polyester resin (ASTM-E96-66, measured by the E method) is 0.0078 perm-inch, whereas the vinyl ester resin The water vapor transmission coefficient is 0.0013 perm-inch, and the latter permeation resistance is about 6 times higher.

(Sixth invention)
The structure of the sixth invention of the present application for solving the above-mentioned problem is a tank lining construction in which the inner surface is cleaned and uniformly roughened by a sandblasting method in the ground treatment process according to the first to fifth inventions. Is the method.

  Conventionally, as a base (tank inner wall surface) processing in tank lining, for example, grinder processing or the like has been the mainstream. In the case of this base treatment, the bonding strength of the primer layer to the base after the treatment is not always sufficient.

  In the ground treatment by the sandblasting method, it is possible to realize a good roughening simultaneously with the cleaning of the ground. Due to the roughening of the base, the adhesion area between the base and the primer layer is increased, the anchor effect of the primer meshing with the rough surface is ensured, and the bonding strength of the primer layer to the base is improved. Incidentally, FIG. 4 shows an enlarged photograph of the ground plane after processing by the sandblasting method (an optical microscope photograph of 100 times magnification), and the above-mentioned roughening effect is clearly recognized.

  In addition, surface treatment by sandblasting in tank lining is only possible in combination with a sufficient barrier effect against fuel oil, solvent, etc. by the fluid barrier layer to increase the bonding strength of the primer layer to the substrate to a practically effective level. Can do.

  In the above-mentioned Patent Document 2, the ground treatment by the sandblasting method is described. However, since the fluid barrier layer uses a conventional unsaturated polyester resin as a matrix and is an FRP layer, a sufficient barrier effect cannot be obtained. Therefore, it is not possible to expect sufficient bonding strength of the primer layer to the base.

(Seventh invention)
The seventh aspect of the present invention for solving the above-described problem is a multi-layer lining structure that covers the inner surface of a fuel or solvent tank, and includes at least the following layers (a) and (b): Inner surface lining structure.
(A) Primer layer.
(B) A composite barrier comprising one or more fiber-reinforced resin sheet layers (FRP layers) and one or more flake-containing resin sheet layers in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction. layer.

  In the fuel tank having the tank inner surface lining structure according to the seventh invention, not only for fuels such as ordinary gasoline and light oil, but also for mixed fuels mixed with alcohol and ethers, various kinds of fuel tanks are also provided. The various actions and effects described above with respect to the first invention are also ensured for organic solvents and inorganic solvents.

  The tank inner surface lining structure according to the present invention naturally includes not only the tank inner surface lining structure as a result of repairing an existing tank, but also a newly constructed tank inner surface lining structure. To do.

(Eighth invention)
The structure of the eighth invention of the present application for solving the above-described problem is that the composite barrier layer according to the seventh invention has a structure that satisfies one or more of the following conditions (c) or (d): It is.
(C) The flake-containing resin sheet layer constitutes a lining surface layer that is a layer in contact with the fuel in the tank.
(D) A flake-containing resin sheet layer is formed on the primer layer.

  In the tank inner surface lining structure according to the eighth invention, the various actions and effects described above with respect to the second invention or the third invention are ensured.

(9th invention)
The structure of the ninth invention of the present application for solving the above-mentioned problem is that the multi-layer lining structure according to the seventh invention or the eighth invention is constructed in the order of the following (b) to (f): It is a structure.
(B) Primer layer.
(C) 1st flake containing resin sheet layer.
(D) One or more fiber reinforced resin sheet layers.
(E) Surface mat layer.
(F) Second (innermost layer) flake-containing resin sheet layer.

  As one of standard embodiments of the tank inner surface lining structure according to the present invention, the tank inner surface lining structure of the ninth invention can be exemplified.

(10th invention)
The structure of the tenth invention of the present application for solving the above-mentioned problem is one or more of the flake-containing resin sheet layer, the fiber-reinforced resin sheet layer, and the surface mat layer according to any one of the seventh to ninth inventions. The inner surface lining structure of the tank, wherein the matrix resin constituting the layer is a resin selected from a group of fuel oil resistant and solvent resistant resin materials including at least a vinyl ester resin.

  According to the tenth aspect of the invention, it is possible to expect the actions and effects described above with respect to the fifth aspect of the tank inner surface lining structure.

  According to the present invention, there are provided a tank lining construction method and an in-tank surface lining structure in which the barrier layer has excellent durability and permeation resistance against fuel and solvent, and the primer layer does not peel between the barrier layer and the base.

  Next, embodiments or examples of the first invention to the tenth invention of the present application will be described. The technical scope of the present invention is not limited by these embodiments or examples.

[Tank lining construction method]
The tank lining construction method according to the present invention basically includes the following steps (1) to (3).
(1) The surface treatment process of the tank inner surface.
(2) A primer coating process for forming a primer layer.
(3) A composite barrier comprising one or more fiber-reinforced resin sheet layers (FRP layers) and one or more flake-containing resin sheet layers in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction. A barrier layer forming step of forming a layer;

  In addition, in the above-mentioned composite barrier layer or between the composite barrier layer and the primer layer, an arbitrary kind of layer such as a surface mat layer can be additionally included as required.

  In the composite barrier layer, preferably, the flake-containing resin sheet layer can be formed as a lining surface layer that is in contact with the fuel in the tank for the reason described above with respect to the second invention.

  In the composite barrier layer, preferably, the flake-containing resin sheet layer can be formed on the primer layer for the reason described above with respect to the third invention.

  In the composite barrier layer, more preferably, a flake-containing resin sheet layer can be respectively formed on the tank base side and the tank inner side of one or more fiber reinforced resin sheet layers.

Considering the above points comprehensively, as an example of a preferable tank lining construction method, a method of performing construction on the inner surface of the fuel tank in the following order (a) to (f) can be exemplified.
(A) Ground treatment process (b) Primer coating process.
(C) The process of forming a 1st flake containing resin sheet layer.
(D) A step of forming one or more fiber-reinforced resin sheet layers.
(E) A step of forming a surface mat layer.
(F) A step of forming a second (innermost layer) flake-containing resin sheet layer.

[Applicable items for tank lining construction method]
The types of tanks to be constructed by the tank lining construction method are not limited, and include various fuel tanks such as gasoline tanks, light oil tanks, kerosene tanks, and heavy oil tanks. The fuel tank includes a tank filled with various mixed fuels. In addition, tanks for various solvents, for example, organic solvents such as alcohols, ethers, toluene and other aromatic solvents, and solvents such as dilute hydrochloric acid, phosphoric acid, aqueous ammonia and other inorganic solvents are also subject to construction.

  The classification according to the installation site of the tank is not limited to a tank buried underground, but also includes a tank installed in an underground tank installation chamber and a tank installed on the ground. The classification according to the installation form of the tank includes tanks of various installation types such as a horizontal installation type and a vertical installation type.

  From the classification according to the structure of the tank wall, the main construction target is a single-shell or double-shell tank made of metal walls such as steel or steel, but the conventional FRP wall is the main structure, or A tank such as a single shell or a double shell in which a conventional FRP wall is provided on the inner surface of the metal wall can also be a construction target.

[Pretreatment process]
The ground treatment step is a pretreatment for cleaning the inner surface of the tank and adjusting the primer coating conditions. In the tank lining construction method of the present invention, the content of the ground treatment step is not necessarily limited, and for example, conventional grinder processing can also be performed. Preferably, for the reason described above with respect to the sixth invention, the inner surface is processed by sandblasting. Clean and uniformly roughen the surface.

[Primer painting process]
Primer coating is performed to ensure good adhesion between the substrate and the lining layer. The material type of the primer and the coating method thereof are not limited, and various known primers can be coated based on the various known primer coating methods as necessary.

The primer coating and its coating method are not particularly limited, and any known appropriate kind of primer coating and coating method can be arbitrarily selected and used. As the primer coating, for example, a three-component primer coating composed of a primer resin, cobalt naphthenate, and methyl ethyl ketone peroxide (METPO) can be used.
[Fiber-reinforced resin sheet layer (FRP layer)]
The fiber reinforced resin sheet layer (FRP layer) is a layer made of a material in which a mat-like sheet formed by weaving reinforcing fibers such as glass fibers in a matrix resin. The fiber-reinforced resin sheet layer may be a layer made of a material in which various known reinforcing fibers such as glass fibers are dispersed in a matrix resin. The type of resin that is a matrix is not limited, and for example, any resin such as an unsaturated polyester resin such as an isophthalic acid type or a bisphenol type, an epoxy resin, or a urethane resin can be used. For the reasons described above, various vinyl ester resins such as bisphenol type and novolac type can be used. As a material having low fuel permeability, a fluororesin or the like can be exemplified in addition to the vinyl ester resin. In forming the fiber reinforced resin sheet layer, for example, first, a liquid matrix resin is brushed, then a mat-like fiber sheet such as a glass fiber mat is spread and fixed with the liquid matrix resin, and then dried and fixed. It can be done by the procedure of letting.

  Only one fiber-reinforced resin sheet layer in the composite barrier layer may be provided, or two or more layers may be provided. When two or more fiber reinforced resin sheet layers are provided, they may be provided continuously, or another layer (for example, a flake-containing resin sheet layer) may be provided between them. A surface mat layer as a kind of fiber reinforced resin sheet layer may be additionally provided.

Although the thickness of a fiber reinforced resin sheet layer is not limited, For example, it can be set as the thickness of about 0.5 mm-1.5 mm.
[Flake-containing resin sheet layer]
The flake-containing resin sheet layer is a layer made of a material in which a flat fluid-impermeable flake material is oriented and dispersed in the layer direction in a matrix resin.

  The type of the resin that is the matrix is not limited, and for example, conventionally known unsaturated polyester resins such as isophthalic acid type and bisphenol type, epoxy resin, urethane resin, etc. can be used, and particularly preferably, the fifth invention. For the reasons described above, various vinyl ester resins such as bisphenol type and novolac type can be used. As a material having low fuel permeability, a fluororesin or the like can be exemplified in addition to the vinyl ester resin.

  The type and shape of the flake material is not limited as long as it is made of a fluid-impermeable material and has a planar shape with a large aspect ratio (spread to thickness ratio). Specific examples include glass flakes, silica-based layered mineral pieces, and hard resin flakes.

  The shape, size, and dispersion density of the flake material dispersed in the flake-containing resin sheet layer are factors that affect the barrier performance of the flake-containing resin sheet layer, but as long as sufficient dispersibility and barrier performance are ensured, These are not limited. For example, the flake material has an average particle diameter (average long diameter in the shape of flat particles) in the range of about 0.1 mm to 5 mm, and has a planar shape with an aspect ratio of about 5 to 10 or more. The dispersion amount of the flake material in the matrix resin is preferably about 5% by weight to 30% by weight with respect to the entire flake-containing resin sheet layer.

  Although the formation method of a flake containing resin sheet layer is not limited, For example, it can carry out by the procedure of coating the matrix resin which mixed the flake material with appropriate means, such as brush painting, and drying and solidifying.

  Only one flake-containing resin sheet layer in the composite barrier layer may be provided, or two or more layers may be provided. When two or more flake-containing resin sheet layers are provided, they may be provided continuously, or another layer (for example, one layer or two or more fiber-reinforced resin sheet layers) may be provided between them. good. The flake-containing resin sheet layer and the fiber-reinforced resin sheet layer can be alternately stacked a plurality of times.

  Although the thickness of a flake containing resin sheet layer is not limited, For example, it can be set as the thickness of about 0.2 mm-0.6 mm.

[Tank inner surface lining structure]
The tank inner surface lining structure according to the present invention is a multilayer lining structure that covers the inner surface of the fuel tank, and includes at least the following layers (a) and (b).
(A) Primer layer.
(B) A composite barrier comprising one or more fiber-reinforced resin sheet layers (FRP layers) and one or more flake-containing resin sheet layers in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction. layer.

More preferably, the inner surface lining structure of the tank has a structure in which the composite barrier layer satisfies one or more of the following conditions (C) and (D).
(C) The flake-containing resin sheet layer constitutes a lining surface layer that is a layer in contact with the fuel in the tank.
(D) A flake-containing resin sheet layer is formed on the primer layer.

  Furthermore, it is also preferable to form a flake-containing resin sheet layer on each of the tank base side and the tank inner side of one or more fiber reinforced resin sheet layers.

Considering the above points comprehensively, as an example of the most preferable in-tank surface lining structure, an in-tank surface lining structure in which a multilayer lining structure is configured in the following order (b) to (f) can be exemplified.
(B) Primer layer.
(C) 1st flake containing resin sheet layer.
(D) One or more fiber reinforced resin sheet layers.
(E) Surface mat layer.
(F) Second (innermost layer) flake-containing resin sheet layer.

  An example of such a tank inner surface lining structure is shown in FIG. FIG. 3 is a perspective view showing a part of the tank wall portion 7 cut away. The upper side of the figure is the tank inner side, and the lower side of the figure is the tank wall side. The tank wall portion 7 is formed on a steel tank inner wall plate 8 as a base, in order, a primer layer 9, a first flake-containing resin sheet layer 10, two fiber-reinforced resin sheet layers 11, and a surface mat layer 12. The second flake-containing resin sheet layer 13 is provided.

  The thickness of each layer is about 0.1 to 0.3 mm for the primer layer 9, about 0.2 to 0.6 mm for the first flake-containing resin sheet layer 10, and 0 for each of the two fiber-reinforced resin sheet layers 11. The surface mat layer 12 is about 0.03 to 1.0 mm, and the second flake-containing resin sheet layer 13 is about 0.2 to 0.6 mm. The total thickness of the lining from the primer layer 9 to the second flake-containing resin sheet layer 13 is preferably about 1 to 6 mm, for example.

  According to the present invention, there is a tank lining construction method in which the permeability of the barrier layer to fuel and solvent is remarkably low, the durability of the barrier layer to fuel and solvent is remarkably high, and the primer layer does not peel off between the barrier layer and the base. Provided. The resulting in-tank surface lining structure is also provided.

(A) and (b) of FIG. 1 show a simplified structure of the fiber-reinforced resin sheet layer and the flake-containing resin sheet layer, respectively.

FIGS. 2A and 2B show an enlarged cross-sectional photograph of the flake-containing resin sheet layer and an explanation of its fluid barrier action.

FIG. 3 shows an embodiment of a tank inner surface lining structure.

FIG. 4 is an enlarged photograph showing the surface roughening by the sandblasting method of the base.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 FRP layer 2 Flakes containing resin sheet layer 3 Matrix resin 4 Reinforcing fiber 6 Flakes material 7 Tank wall part 8 Tank inner wall board 9 Primer layer 10 First flake containing resin sheet layer 11 Fiber reinforced resin sheet layer 12 Surface mat layer 13 First 2 Flakes-containing resin sheet layer

Claims (5)

A tank lining construction method characterized in that construction is performed on the inner surface of the tank for repairing the inner surface of the fuel or solvent tank in the following order (a) to (f) .
(A) The surface treatment process of the tank inner surface.
(B) A primer coating process for forming a primer layer.
(C) A step of forming a first flake-containing resin sheet layer in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction.
(D) A step of forming one or more fiber reinforced resin sheet layers (FRP layers).
(E) A step of forming a surface mat layer.
(F) A step of forming a second (innermost layer) flake-containing resin sheet layer in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction. A fuel oil- and solvent-resistant resin material group in which the matrix resin constituting at least one of the flake-containing resin sheet layer, the fiber-reinforced resin sheet layer, and the surface mat layer includes at least a vinyl ester resin. The tank lining construction method according to claim 1 , wherein the resin is selected from the group consisting of: The tank lining construction method according to claim 1 or 2 , wherein in the base treatment step, the inner surface is cleaned and the surface is uniformly roughened by a sandblasting method. A multi-layer lining structure for covering the inner surface of a fuel or solvent tank, wherein the tank inner surface lining structure is constituted in the following order (b) to (f) .
(B) Primer layer.
(C) A first flake-containing resin sheet layer in which flat fluid-impermeable flake materials are oriented and dispersed in the layer direction.
(D) One or two or more fiber reinforced resin sheet layers (FRP layers).
(E) Surface mat layer.
(F) A second (innermost layer) flake-containing resin sheet layer in which a flat fluid-impermeable flake material is oriented and dispersed in the layer direction. A fuel oil- and solvent-resistant resin material group in which the matrix resin constituting at least one of the flake-containing resin sheet layer, the fiber-reinforced resin sheet layer, and the surface mat layer includes at least a vinyl ester resin. The tank inner surface lining structure according to claim 4 , wherein the resin is selected from the group consisting of: