KR101890089B1 - Method for joining a synthetic sheet to an inner wall of metallic chemical tank and metallic chemical tank prepared by using the same - Google Patents

Abstract

The present invention relates to a method of bonding a synthetic resin sheet to an inner wall of a chemical material tank, and a metal material chemical tank manufactured using the method. More particularly, the present invention relates to a method of easily and stably and firmly bonding a synthetic resin sheet to the inner wall to prevent damage to the inner wall of a chemical chemical tank due to corrosion or the like, and by using the method, durability is greatly improved and manufacturing cost is significantly reduced To a metal chemical tank.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of joining a synthetic resin sheet to an inner wall of a chemical material tank,

The present invention relates to a method of bonding a synthetic resin sheet to an inner wall of a chemical material tank, and a metal material chemical tank manufactured using the method. More particularly, the present invention relates to a method of easily and stably and firmly bonding a synthetic resin sheet to the inner wall to prevent damage to the inner wall of a chemical chemical tank due to corrosion or the like, and by using the method, durability is greatly improved and manufacturing cost is significantly reduced To a metal chemical tank.

A metal chemical tank for storing a highly toxic chemical such as sulfuric acid, hydrofluoric acid, and hydrochloric acid is damaged due to corrosion or chemical reaction of the inner wall of the metal tank due to contact with the above-mentioned toxic chemical, And the lifetime of these metal chemical tanks is only 5 to 7 years.

In fact, in August 2015, a chemical tank leak in a chemical plant in Tianjin, China, killed 173 people in an accident, and a more robust process safety management system (PSM) law was applied in Korea. Is being recognized.

Conventional metal chemical tanks have attempted to attach the synthetic resin sheet to the inner wall for protecting the inner wall of the metal chemical tank. However, there has not been developed a technique for stably attaching the synthetic resin sheet to the inner wall of the metal material by heat fusion or the like. However, Korean Patent No. 1547468 There is disclosed a method of attaching a synthetic resin sheet to an inner wall surface of a steel tank using a plurality of adjustable expansion bands. However, there is a problem that the expansion band is directly contacted with a toxic chemical substance and is corroded or damaged, In addition, there is a problem that the synthetic resin sheet disposed between the extension bands due to the external heat in summer expands and chemical substances leak.

On the other hand, chemical tanks used by large corporations are equipped with Teflon inside steel tanks, so they have excellent durability but they are 7 to 10 times more expensive than general chemical tanks.

Therefore, a method of joining a synthetic resin sheet, which can remarkably improve the durability of the metal chemical tank and remarkably reduce the manufacturing cost by joining the synthetic resin sheet easily, stably and firmly to the inner wall of the chemical chemical tank, And the like.

It is an object of the present invention to provide a method capable of easily and simply bonding a synthetic resin sheet to the inner wall of a metallic chemical tank and a metallic chemical tank manufactured using the same.

It is another object of the present invention to provide a method for stably and firmly bonding a synthetic resin sheet to the inner wall of a chemical material tank, and a metal chemical tank manufactured using the method.

In order to solve the above problems,

A method of bonding a synthetic resin sheet to an inner wall of a chemical tank of a metal, comprising the steps of: bonding one or more bonding structures to an inner wall of a chemical chemical tank; disposing a synthetic resin sheet on the bonding structure; And partially melting the portion where the structure is disposed, and thermally fusing the portion to the joining structure. The present invention also provides a method of joining a synthetic resin sheet.

Here, the joining structure is made of the same metal material as the inner wall of the chemical material tank, and the joining structure is joined to the inner wall of the chemical material tank by welding.

The present invention also provides a method of joining a synthetic resin sheet, wherein the partial melting of the synthetic resin sheet is performed by polymer fusion.

The joining structure may include a rim portion, an inclined portion, and a lower plate. The inclined portion connecting the rim and the lower plate may be disposed at a position recessed relative to the rim portion, A hollow space is formed between the lower plate and the inner wall when the rim portion is at least partially in contact with the inner wall of the metal chemical tank, and the resin partially melted in the synthetic resin sheet penetrates through at least one through hole provided in the lower plate Wherein a cross-sectional area of the through hole at a surface of the lower plate contacting the void space is smaller than a cross-sectional area of the through hole at a surface of the lower plate contacting the synthetic resin sheet, And a method of joining a synthetic resin sheet .

Wherein the cross-sectional area of the through-hole in the surface of the lower plate which contacts the hollow space in the lower plate with respect to the cross-sectional area of the through-hole in the surface in contact with the synthetic resin sheet is 10 to 90% And a method of joining the same.

The present invention also provides a method of joining a synthetic resin sheet, wherein the inner wall of the through hole is formed in a spiral shape.

The through hole is disposed around the lower plate and is not disposed at the center of the lower plate.

Further, the rim portion includes at least one welding hole for welding the joining structure to the inner wall in a state of being in contact with the inner wall.

A synthetic resin sheet is provided on the inner wall of the main body by the method according to the first or second aspect of the present invention, A metal chemical tank is provided.

Here, the main body includes an upper body for storing a chemical substance, and a lower body disposed at a lower portion of the upper body and having an outlet connected to the bottom of the upper body, wherein the lower body includes a chemical substance Wherein a sensor capable of detecting the leakage of the metal is further disposed.

The method of joining the synthetic resin sheet according to the present invention to the inner wall of the chemical material tank can easily and simply join the synthetic resin sheet and the inner wall by using the joining structure disposed between the synthetic resin sheet to be joined and the inner wall of the chemical material tank And exhibits excellent effects.

In addition, the method of bonding the synthetic resin sheet according to the present invention to the inner wall of the chemical material tank can exhibit an excellent effect of stably and firmly bonding the synthetic resin sheet to the inner wall of the chemical material tank through a specific bonding method.

1 schematically shows a metallic chemical tank.
2 schematically shows the arrangement of a bonding structure for bonding a synthetic resin sheet to the inner wall of a metallic chemical tank.
Fig. 3 schematically shows the shape of embodiments of a structure for bonding synthetic resin sheets used in the method according to the present invention. Fig.
Fig. 4 schematically shows a cross-sectional view taken along line A-A 'in Fig. 3a.
FIG. 5 is a schematic view showing a state in which a synthetic resin sheet is bonded to the inner wall of a chemical material tank using the bonding structure of FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

FIG. 1 schematically shows a metallic chemical tank, specifically, FIG. 1a schematically shows an external view of a metallic chemical tank, and FIG. 1b schematically shows an inside view of a metallic chemical tank.

1, the metallic chemical tank 1000 includes a main body 200, an inflow portion 400 for introducing a chemical into the main body 200, And an outflow part 500 for discharging the water. The main body 200 includes an upper body 210 in which chemicals are stored and a lower body 210 in which an outlet 500 connected to the bottom of the upper body 210 is mounted, (Not shown).

In addition, the inlet 400 and the outlet 500 may be provided with a valve for controlling the flow rate of a chemical introduced into or discharged from the upper body 210, A sensor 230 for detecting the leakage of the chemical of the sensor 230 may be additionally disposed, and the sensor 230 may include a sensor for raising a warning bell or the like by a buoyancy caused by, for example, Lt; / RTI >

Since the inner wall of the upper main body 210 in which the chemical substance is stored is damaged by corrosion, chemical reaction, or the like due to a toxic chemical substance, the durability of the metal chemical tank 1000 is drastically reduced and the service life is shortened. A synthetic resin sheet such as polyethylene (PE) or polypropylene (PP) is bonded to the inner wall of the tank 210 to prevent the inner wall from being damaged. As a result, the durability and life of the metal chemical tank 1000 can be improved.

2 schematically shows the arrangement of a bonding structure for bonding a synthetic resin sheet to the inner wall of a metallic chemical tank.

2, the inner wall 200 of the metal chemical tank may be joined to the synthetic resin sheet 300 by a specific bonding structure 100 disposed between the inner wall 200 and the synthetic resin sheet 300 , The method of bonding the synthetic resin sheet according to the present invention to the inner wall of the chemical material tank may include the steps of a) to c) below.

a) joining one or more bonding structures (100) to a metallic chemical tank inner wall (200)

b) disposing a synthetic resin sheet (300) on the joining structure (100), and

c) partially melting the portion of the synthetic resin sheet 300 where the bonding structure 100 is disposed at the lower portion thereof, and thermally fusing the portion to the bonding structure 100;

In the step a), the at least one joining structure 100 is made of a metal material and can be coupled to the inner wall 200 of the chemical material tank by welding or the like, and the joining structure 100 and the metal material When the chemical tank inner walls 200 are coupled, they may be made of the same metal material, for example, stainless steel, aluminum, or the like.

The distance between the joining structures 100 may be appropriately selected according to the size, weight, etc. of the synthetic resin sheet 300 to be bonded, and may be, for example, 30 cm to 1.5 m.

In the step c), the synthetic resin sheet 300 may be partially melted by polymer fusion or the like, and the synthetic resin sheet 300 may be a single-layer sheet made of one type of synthetic resin, And the like.

Fig. 3 schematically shows the shape of embodiments relating to a structure for joining synthetic resin sheets used in the method according to the present invention, and Fig. 4 schematically shows a cross-sectional view taken along line A-A 'in Fig.

As shown in FIG. 3, the joining structure 100 may have a generally hexagonal shape as shown in FIG. 3A, an overall square shape as shown in FIG. 3B, or a generally circular shape as shown in FIG. And may be attached to the inner wall of the chemical material tank by welding or the like.

As shown in FIGS. 3 and 4, the joining structure 100 may include a rim 110, a slope 120, and a lower plate 130. Here, the tether 110 is a portion at least partially contacting the inner wall of the chemical tank when the synthetic resin sheet is bonded to the inner wall of the chemical tank 200 using the bonding structure 100, The lower plate 130 is disposed in a recessed position with respect to the rim 110 by the inclined portion 120 connecting the upper surface 110 and the lower plate 130, And forms an empty space 121 with the inner wall 200 of the chemical and metal tank.

Specifically, the rim portion 110 is a portion contacting the inner wall 200 of the metallic chemical tank, and the rim portion 110 is formed in the inner wall 200 to be in contact with the inner wall 200, And may include one or more engaging portions 111 which may be, for example, a welded hole for welding it to the inner wall 200, and the diameter of the welded hole may be about 5 to 13 mm And may be disposed on the upper and lower portions of the joining structure 100, respectively.

When the high frequency welding is used to join the synthetic resin sheet 300 to the joining structure 100 through partial thermal fusion of the synthetic resin sheet 300 so that the high frequency waves do not come out of the joining structure 100, May be coated with insulating paper, an insulator, or the like, on a surface of the metal material tank 200 contacting the inner wall 200.

The lower plate 130 may be disposed at a position recessed relative to the rim 110 to prevent the lower plate 130 from contacting the inner wall of the chemical material tank 200 If the empty space 121 can be formed, there is no particular limitation on the degree and shape of the inclination.

One or more through holes 131 may be formed in the lower plate 130. When the synthetic resin sheet 300 is partially thermally fused to the joining structure 100, the resin partially melted in the synthetic resin sheet 300 passes through the through-hole 131 to the empty space 121 The synthetic resin sheet 300 can be firmly bonded to the joining structure 100 and consequently the joining structure 100 can be used to join the metal material chemical tank inner wall 200 ) To be stably and firmly bonded.

The through hole 131 may be disposed around the lower plate 130 and the through hole 131 may not be disposed at the center of the lower plate 130. As a result, the synthetic resin sheet 300 can be more stably bonded to the joining structure 100, and the degree of partial melting of the synthetic resin sheet 300 can be controlled, The thickness is locally excessively thinned and the durability is prevented from being lowered.

The number of the through holes 131 may be about 98 to 120, and the number of the through holes 131 may be about 4 to 8 mm. The shape of the through hole 131 is not limited to a circular shape or a square shape. The diameter of the through hole 131 in the portion contacting the synthetic resin sheet 300 may be 1.5 to 2.5 mm. Here, the circle-converted diameter means a diameter when the shape of the through-hole 131 is converted into a circle having the same area as the cross-sectional area thereof when the shape is not a circle.

Particularly, the cross-sectional area of the through-hole 131 on the surface contacting the void space 121 may be smaller than the cross-sectional area of the through-hole 131 on the surface where the synthetic resin sheet 300 contacts the lower plate 130, The through hole 131 may have a cross sectional area of 10 to 90%, preferably 40 to 80%, at a surface contacting the void space 121 with respect to a cross sectional area at a surface contacting the synthetic resin sheet 300, Lt; / RTI >

As a result, the molten resin passing through the through hole 131, which gradually becomes narrower when the synthetic resin sheet 300 is partially melted and passes through the through hole 131, is gradually increased in flow rate passing through the through hole 131 Hemispherical, elliptical, or the like due to a suddenly reduced pressure when it is inserted into the hollow space 121 after passing completely through the through hole 131 and then hardened. Therefore, the cured synthetic resin is inserted into the hollow space 121, The portion of the synthetic resin sheet 300 can not escape through the through hole 131 again, so that the synthetic resin sheet 300 can be stably bonded to the joining structure 100 more stably.

Preferably, the through-hole 131 is formed in a spiral shape so that the molten resin passing through the through-hole 131 is more easily moved, and the size of the spherical, hemispherical, The synthetic resin sheet 300 can be more stably and firmly brought into contact with the joining structure 100. [

The bonding structure 100 according to the present invention may have a total length of about 100 to 134 mm, a width of about 80 to 90 mm, a height of about 2.5 to 4.8 mm, a thickness of about 0.5 to 1.5 mm, Can be appropriately selected according to the specifications of the metal chemical tank and the synthetic resin sheet.

FIG. 5 is a schematic view showing a state in which a synthetic resin sheet is bonded to the inner wall of a chemical material tank using the bonding structure of FIG.

5, the joining structure 100 may be disposed between the inner wall of the metal chemical tank 200 and the synthetic resin sheet 300 such as polyethylene (PE) or polypropylene (PP) have. Specifically, the joining structure 100 may be attached to the inner wall of the metallic chemical tank 200 by welding or the like through a welding hole, for example, as a joining part 111 disposed at the rim 110 of the joining structure.

After the joining structure 100 is attached to the inner wall 200 of the chemical material tank, the synthetic resin sheet 300 may be bonded to the joining structure 100. Specifically, the synthetic resin sheet 300 is partially melted by high-frequency welding or the like while being in contact with the outer surface of the lower plate 130 of the joining structure 100, and the melted resin is transferred to the lower plate 130 The synthetic resin sheet 300 is inserted into the void space 121 between the joining structure 100 and the inner wall of the metallic chemical tank 200 through the arranged through holes 131 and then hardened, 100, and as a result, it is bonded to the inner wall 200 of the metallic chemical tank.

The cured resin 310 inserted into the hollow space 121 is formed into a spherical shape, a hemispherical shape, an elliptical shape, or the like by the specific shape of the through hole 131, and can not escape through the through hole 131 again Therefore, the synthetic resin sheet 300 can be bonded to the joining structure 100 very stably and firmly.

The method of joining the synthetic resin sheet according to the present invention to the inner wall of the chemical material tank allows the synthetic resin sheet 300 to be stably and firmly bonded to the inner wall of the chemical material tank 200 using the joining structure 100, The durability of the joining structural body 100 can be improved and the durability of the metal chemical tank can be further improved because the joining structural body 100 is not directly exposed to the chemical substance, And exhibits an excellent effect of reducing the manufacturing cost of the chemical tank.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

100: joining structure 200: metal chemical tank
300: synthetic resin sheet

Claims (9)

A method of bonding a synthetic resin sheet to an inner wall of a chemical tank of a metal,
The method includes the steps of: bonding one or more bonding structures to an inner wall of a chemical chemical tank; disposing a synthetic resin sheet on the bonding structure; and partially melting the portion of the synthetic resin sheet on which the bonding structure is disposed, And thermally fusing the portion to the joining structure,
Wherein the joining structure includes a rim, an inclined portion, and a lower plate,
Wherein the lower plate is disposed in a recessed position with respect to the rim by the inclined portion connecting the rim and the lower plate so that when the rim is at least partially in contact with the inner wall of the chemical material tank, An empty space is formed between the inner walls,
The partially melted resin in the synthetic resin sheet is inserted into the hollow space through the at least one through hole provided in the lower plate and is hardened,
And the inner wall of the through hole is formed in a spiral shape. A method of bonding a synthetic resin sheet to an inner wall of a chemical tank of a metal,
The method includes the steps of: bonding one or more bonding structures to an inner wall of a chemical chemical tank; disposing a synthetic resin sheet on the bonding structure; and partially melting the portion of the synthetic resin sheet on which the bonding structure is disposed, And thermally fusing the portion to the joining structure,
Wherein the joining structure includes a rim, an inclined portion, and a lower plate,
Wherein the lower plate is disposed in a recessed position with respect to the rim by the inclined portion connecting the rim and the lower plate so that when the rim is at least partially in contact with the inner wall of the chemical material tank, An empty space is formed between the inner walls,
The partially melted resin in the synthetic resin sheet is inserted into the hollow space through the at least one through hole provided in the lower plate and is hardened,
Wherein the through hole is disposed around the lower plate and is not disposed at the center of the lower plate. 3. The method according to claim 1 or 2,
Wherein the joining structure is made of the same metal material as the inner wall of the chemical material tank, and the joining structure is joined to the inner wall of the chemical material tank by welding. 3. The method according to claim 1 or 2,
Characterized in that the partial melting of the synthetic resin sheet is carried out by polymer fusion. 3. The method of claim 2,
Wherein a cross-sectional area of the through-hole at a surface of the lower plate which is in contact with the hollow space is smaller than a cross-sectional area of the through-hole at a surface of the lower plate contacting the synthetic resin sheet. 6. The method of claim 5,
Wherein a cross-sectional area of the through-hole in a surface of the lower plate which contacts the hollow space with respect to a cross-sectional area of the through-hole in a surface contacting the synthetic resin sheet in the lower plate is 10 to 90% Way. 3. The method according to claim 1 or 2,
And the rim portion includes at least one welding hole for bonding the joining structure to the inner wall by welding in a state of being in contact with the inner wall. main body,
An inlet for introducing a chemical substance into the body, and
And an outflow portion for discharging the chemical substance inside the body to the outside,
A metal chemical tank, characterized in that a synthetic resin sheet is bonded to the inner wall of the body by the method of claim 1 or 2. 9. The method of claim 8,
Wherein the main body includes an upper body for storing chemicals and a lower body disposed below the upper body and having an outlet connected to the bottom of the upper body,
Wherein a sensor capable of detecting leakage of a chemical substance from the upper main body is further disposed inside the lower main body.

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