KR20200035512A - Pipe Jacketing Method Using Light Cured Sheet - Google Patents

Abstract

The present invention relates to a pipe jacketing method using a photo-curing sheet, which can replace an existing stainless steel jacket by wrapping the outside of a pipe using the photo-curing sheet containing a reinforcing agent. The present invention provides the pipe jacketing method using the photo-curing sheet, which includes the following steps of: (a) attaching the photo-curing sheet comprising the reinforcing agent along the outer peripheral surface of the pipe; (b) attaching another photo-curing sheet along the outer circumferential surface of the pipe to which the photo-curing sheet is not attached; and (c) repeating the step (b) to complete the attachment of the photo-curing sheet, followed by curing by irradiating light.

Description

Pipe Jacketing Method Using Light Cured Sheet}

The present invention relates to a pipe jacketing method using a photo-curing sheet, and more specifically, by using a photo-curing sheet that can replace the existing stainless steel jacket by wrapping the outside of the pipe using a photo-curing sheet containing a reinforcing agent. It relates to a pipe jacketing method.

Pipe refers to a hollow or circular material, which is often used for the transportation of fluids having a fluidity such as gas or liquid. These pipes are used in many industries and daily life, and are considered an indispensable material in modern society.

These pipes have various diameters according to their use, and are also made of various materials. In particular, pipes made of copper or stainless steel have high corrosion resistance, so they are used as water pipes or heating pipes, and polymer resin pipes are widely used in sewage and sewage pipes that require high corrosion resistance. In addition, pipes made of steel or concrete having high strength are also used to transport a large amount of fluid.

However, since these metal pipes have high thermal conductivity, a lot of heat loss occurs when transporting a fluid having a temperature different from the outside temperature. In addition, when cold fluid is transported compared to the outside, condensation occurs on the outside of the pipe, and the corrosion of the pipe tends to be accelerated.

In order to solve this, a method of wrapping the outside of the pipe with a heat insulating material has been used a lot, but most of the heat insulating material has a disadvantage that durability is inferior to that of a pipe, and when moisture penetrates, the heat insulating property is poor and corrosion occurs. Therefore, in order to improve the durability of the heat insulating material and to protect it from moisture, a method of wrapping the outside of the pipe with a jacket is widely used.

Most of the existing jackets are made of stainless steel, which is resistant to moisture, or used for iron products through surface treatment. However, in the case of stainless steel or iron, it is known that moisture may penetrate the seam or the longitudinal section to corrode or denature the jacket itself. In this way, when corrosion or degeneration due to moisture occurs, a time and cost net loss is generated to replace the jacket, and thus a method for solving the problem is needed.

(0001) Republic of Korea Patent Publication No. 10-2016-0150076 (0002) Republic of Korea Patent Publication No. 10-2014-0090391

The present invention has been devised to solve the above problems, and can replace the existing stainless steel jacket by wrapping the outside of the pipe by using a light-curing sheet containing a reinforcing agent, and is mechanically strong and seamless, waterproof, stretchable, It is intended to provide a pipe jacketing method using a photocuring sheet having chemical resistance.

In order to solve the above-mentioned problems, the present invention comprises the steps of (a) attaching a photo-curing sheet comprising a reinforcing agent along the outer peripheral surface of the pipe; (b) attaching another photocuring sheet along the outer peripheral surface of the pipe to which the photocuring sheet is not attached; And (c) repeating the step (b) to complete the attachment of the photo-curing sheet, followed by curing by irradiating light to provide a pipe jacketing method using the photo-curing sheet.

Before the step (a), the step (a`) may further include attaching a heat insulating material to the outer circumferential surface of the pipe.

The photo-curing sheet of step (b) may be attached so that the width of the attached photo-curing sheet 10 ~ 80mm overlap.

The photocuring sheet of step (b) is attached adjacently so as not to overlap with the attached photocuring sheet, and may further include a step of reinforcing the adjacent surface of the photocuring sheet after attachment (b`).

The step (b`) may be a step of attaching a photo-curing sheet having a width of 10 to 200 mm to the upper portion of the adjacent surface to reinforce it.

The light may be ultraviolet light or sunlight having a wavelength of 360 to 420 nm.

The step (c) of irradiating light and curing may irradiate light for 2 to 20 minutes, and may be performed at -15 to 65 ° C.

The photo-curing sheet containing the reinforcing agent may include a composite resin layer and a reinforcing agent layer.

The reinforcing agent layer may be glass fiber, carbon fiber, or a mixture thereof.

The composite resin layer may include a photocurable polymer, a dispersant, a filler, a colorant, a thickener, and an antifoaming agent.

The photo-curing sheet containing the reinforcing agent may be composed of an upper protective film, a first composite resin layer, a surface mat, a reinforcing agent layer, a second composite resin layer and a lower protective film.

The photo-curing sheet supplies a first carrier film from a first film supply unit; Applying the resin composition on the first carrier film; Supplying fibers on the first carrier film coated with the resin composition; Cutting the fiber at the fiber cutting portion; After applying the resin composition on the second carrier film supplied from the second film supply unit, the second carrier film and the first carrier film contact to form a sheet; And forming a photocured sheet by photocuring the sheet in the light irradiation part.

The pipe jacketing method using the photo-curing sheet according to the present invention is constructed using a photo-curing sheet superior in elasticity, chemical resistance, weatherability and workability compared to the existing stainless steel jacket. It can be used for jacketing and reinforcement of ships, pipeline reinforcement in ships, tank reinforcement of refineries and chemical plants.

1 is a schematic view of a photo-curing sheet comprising a reinforcing agent according to an embodiment of the present invention.
Figure 2 is a photograph showing the use and construction of the photo-curing sheet comprising a reinforcing agent according to an embodiment of the present invention.
Figure 3 is a schematic illustration of a method of overlap bonding construction of a photocuring sheet comprising a reinforcing agent according to an embodiment of the present invention.
Figure 4 briefly shows a butt bonding construction method of a photo-curing sheet comprising a reinforcing agent according to an embodiment of the present invention.
5 is a schematic view showing a method for constructing a photocuring sheet containing a reinforcing agent according to an embodiment of the present invention in a tank.
Figure 6 is a photograph showing the packaging appearance during storage or transportation of a photo-curing sheet containing a reinforcing agent according to an embodiment of the present invention.
Figure 7 shows an experimental apparatus of a photo-curing sheet comprising a reinforcing agent according to an embodiment of the present invention (a) is a universal tester, (b) shows a salt spray environment tester.
8 briefly shows a method of manufacturing a photo-curing sheet according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail. In the description of the present invention, when it is determined that a detailed description of related known technologies may obscure the subject matter of the present invention, the detailed description will be omitted. Throughout the specification, when a part “includes” a certain component, this means that other components may be further included instead of excluding other components, unless specifically stated to the contrary.

The present invention can be applied to various transformations and can have various embodiments, and thus, specific embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all conversions, equivalents, and substitutes included in the spirit and scope of the present invention.

The terms used in the present invention are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, terms such as include or have are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features, numbers, or steps. It should be understood that it does not preclude the existence or addition possibility of the operation, components, parts or combinations thereof.

The present invention comprises the steps of (a) attaching a photo-curing sheet comprising a reinforcing agent along the outer peripheral surface of the pipe; (b) attaching another photocuring sheet along the outer peripheral surface of the pipe to which the photocuring sheet is not attached; And (c) repeating the step (b) to complete the attachment of the photo-curing sheet, followed by curing by irradiating light to the pipe jacketing method using the photo-curing sheet.

Before the step (a), the step (a`) may further include attaching a heat insulating material to the outer circumferential surface of the pipe. The insulating material is used to insulate the pipe, and can be used without limitation as long as it is a heat insulating material having a desired level of heat shielding performance. However, a nonwoven fabric, a thermal barrier, an insulating layer divided into multiple spaces, a foam, a vacuum layer, a gas layer, or a combination thereof It can be composed of. In addition, the heat insulating material may include a heat reflective layer to reflect heat on one side or both sides, and the heat reflective layer may be a reflective layer including a metal layer. In the case of the insulating layer, heat penetration performance may be deteriorated due to convection and conduction of water when moisture penetrates, so it is preferable to jacket it in the following way to prevent external protection and moisture absorption.

In the present invention, the jacketing means to further protect the outer surface of the heat insulating material, the surface of the structure installed on the outside of the pipe, or the surface of the pipe, and the existing jacketing is mostly made of metal, such as iron or stainless steel, which has been surface-treated. It is wrapped using. It is also a kind of jacketing that wraps the outside of the insulation using a polymer resin such as a film.

The step (a) is a step of attaching the photo-curing sheet containing the reinforcing agent along the outer circumferential surface of the pipe, and is the step of first attaching the photo-curing sheet to the outer surface of the pipe. At this time, it is preferable to attach the first photocured sheet at the starting point or bending point of the pipe to increase water resistance and airtightness, and when there is an insulating material outside the pipe, the starting point of the photocuring sheet is 5mm ~ It is preferred that 100 mm is attached longer so that it directly contacts the pipe. When the starting point of the photo-curing sheet does not directly contact or is directly attached with a length shorter than 5 mm, moisture may penetrate from the exposed insulation or direct attachment surface, and corrosion of the pipe or insulation may occur, and the insulation performance of the insulation may be reduced. Can decrease.

In addition, the photocurable sheet may be generally supplied in a roll shape having a width of 1 m, and accordingly, it is preferable to cut along the circumference of the pipe and then attach it in the circumferential direction in units of 1 m, but depending on the overall length of the pipe. Then cut. It is also possible to attach by wrapping in the longitudinal direction.

The step (b) is a step of attaching another photo-curing sheet along the outer circumferential surface of the pipe to which the photo-curing sheet is not attached, followed by attaching another photo-curing sheet to the photo-curing sheet attached in step (a). . At this time, the photocuring sheet of step (b) is attached so that the width of the attached photocuring sheet and the width of 10 to 80mm overlap, or is attached adjacently so as not to overlap, and after attachment (b`) the photocuring sheet adjacent surface is reinforced Can be attached.

When the photocuring sheet of step (b) is attached so that the width of 10 to 80 mm overlaps with the photocuring sheet attached (overlapping chip bonding, see FIG. 3), the upper surface of the photocuring sheet attached in step (a) (b) ) Can be made to overlap the photo-curing sheet of step. Particularly, when the photo-curing sheet is operated on a vertical pipe or a tank (see FIG. 5), the sheet of step (a) is disposed at the bottom and a sheet to be subsequently worked is placed at the top to prevent foreign matter or moisture from penetrating along the overlapping surface. It is desirable not to.

When the photo-curing sheet of step (b) is attached adjacently so as not to overlap with the attached photo-curing sheet (butt-bonding, see FIG. 4), the sheet is completed or the adjacent surfaces are reinforced immediately after the sheet is attached to the joint surface. It is desirable to prevent foreign matter or moisture from penetrating. At this time, the step (b`) may be reinforced by attaching a photo-curing sheet having a width of 10 to 200 mm to the upper portion of the adjacent surface, and the photo-curing sheet to be attached is the photo-curing sheet of step (a) or (b). It is advantageous in terms of workability to use the same sheet as. However, if a special reinforcement of the adjacent surface is required or a material in which the pipe inside flows, it is also possible to reinforce the adjacent surface by using another type of photo-curing sheet having a specific water line or a high elastic sheet. When the width of the photo-curing sheet attached to the adjacent surface is less than 10 mm, the adhesion strength is lowered, so that foreign matter or moisture can penetrate into the adjacent surface, and when it exceeds 200 mm, the reinforcing effect is not increased and the loss of material increases.

The step (c) is a step of repeating the step (b) to complete the jacketing of a desired site, and then irradiating and curing the light, preferably using ultraviolet or sunlight having a wavelength of 360 to 420 nm. Do. When using a photo-curing film that is cured for visible light, it is difficult to perform the work smoothly, so it is preferable to use a film that is cured with ultraviolet rays having a wavelength of 360 to 420 nm. In the case of actual work, it is preferable to block light from the outside when working inside a building, work with a fluorescent lamp or an incandescent lamp, and then cure with a UV lamp. At this time, since the sheet is attached to the curved surface, it is preferable to harden using two or more UV lamps for smooth curing, and more preferably, three or more UV lamps can be arranged and used to have an angle of 120 ° around the pipe. Most preferably, four or more UV lamps may be disposed and used to have an angle of less than 90 ° around the pipe. When working outdoors, it is preferable to work at night, and when working in the daytime, it can be cured by blocking the ultraviolet rays on the construction surface by using a tent or the like, and then exposing it to sunlight during the daytime. At this time, the part that is not exposed to sunlight or is covered by the shade may be partially cured using an ultraviolet lamp, and even when sufficient ultraviolet light is not supplied due to weak sunlight, an ultraviolet lamp may be used as an auxiliary to cure.

In addition, the step of curing by irradiating the light is irradiated with light for 2 to 20 minutes, and is preferably performed at -15 to 65 ° C. If the light is irradiated for less than 2 minutes, the curing of the photocuring sheet may be impaired because curing is not completely performed, and when the light is irradiated for more than 20 minutes, the working time may be increased without improvement in physical properties as curing is completed. In addition, if light is irradiated below -15 ° C, curing may be delayed and durability may be deteriorated. When curing at a temperature exceeding 65 ° C, unevenness due to high temperature may occur during curing.

The photo-curing sheet containing the reinforcing agent may include a composite resin layer and a reinforcing agent layer (see FIG. 1). In the case of the composite resin layer, it is a resin layer cured by light, including a photocurable polymer, a dispersant, a filler, a colorant, a thickener, and an antifoaming agent.

The photocurable polymer may be a monofunctional monomer, a polyfunctional monomer, an oligomer, or the like, and the functional group may be acrylates, methacrylates or vinyls.

The acrylate monomers include dipentaerythritol hexaacrylate, pentaerythritol tetraacrylate, pentaerythritol triacrylate, trimethylenepropyl triacrylate, ethylene glycol diacrylate, hexanediol diacrylate, ethylacrylate, ethyl Hexyl acrylate, butyl acrylate, hydroxyethyl acrylate, etc. may be used, but is not limited thereto.

The acrylate-based oligomer is preferably a urethane-modified acrylate oligomer, an epoxy acrylate oligomer, an ether acrylate oligomer, etc. At this time, 2 to 6 acrylate functional groups are suitable. At this time, the weight average molecular weight of the oligomer is preferably 1000 to 10000.

The methacrylate monomers include, but are not limited to, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, butanediol dimethacrylate, hexaethyl methacrylate, butyl methacrylate, and the like. .

The methacrylate-based oligomer is not particularly limited, and has a weight average molecular weight of 1000 to 10000, and is preferably a compound containing a methacrylate group in the molecule.

In addition, the photocurable polymer may include a photoinitiator for smooth curing, and the photoinitiator is preferably a compound capable of decomposing to ultraviolet rays, specifically 1-hydroxy ketone, amino ketone, bis acyl phosphine , 1-hydroxy cyclohexylphenyl ketone, benzyl dimethyl ketal, hydroxydimethylacetophenone, benzoin, benzoin methyl ether, or benzoin ethyl ether, benzoin isopropyl ether, benzoin butyl ether, Irgacure 907 and the like can be used.

The reinforcing agent layer serves as a layer to increase the physical properties of the photo-curing sheet, including glass fibers, carbon fibers, or mixtures thereof.

The reinforcing agent layer is a layer in which glass fiber, carbon fiber, or a mixture thereof is impregnated with resin, and is a layer for determining the strength of the photocurable sheet. Glass fiber or carbon fiber may be used as the reinforcing agent layer, but it is more preferable to mix and use them. At this time, the ratio of the carbon fiber: glass fiber is preferably mixed in a ratio of 1:10 to 1: 1 by weight. When the ratio of the carbon fiber is less than 1:10, the content of the carbon fiber may drop and the tensile strength of the sheet may decrease, and if it exceeds 1: 1, the use of expensive carbon fiber may increase, leading to a decrease in price competitiveness.

In addition, the reinforcing layer may be used simply by mixing carbon fibers and glass fibers, but glass fibers are arranged between carbon fibers arranged at regular intervals so as to have maximum strength while mixing minimum carbon fibers and glass fibers. It is desirable to make it as possible. At this time, after arranging the carbon fibers at regular intervals, and then arranging the glass fibers in the same direction as the carbon fibers between the carbon fibers to produce a sheet, it is possible to manufacture a sheet having a high tensile strength in the arrangement direction of the fibers, When the sheet is produced by arranging carbon fibers in two directions, it is possible to manufacture a sheet having high tensile strength in both directions. However, when arranging the carbon fibers to exceed 4 directions, aggregation of carbon fibers occurs at a portion where the arrangement of the carbon fibers intersects, so the strength may decrease, and the content of the glass fibers may decrease, resulting in a high price.

In addition, after the carbon fiber was arranged in one direction to the reinforcement layer to produce. It is also possible to use two or more layers of reinforcing layers stacked vertically. However, in this case, when three or more sheets are stacked, as the thickness of the composite reinforcing layer increases, the curing of the first UV curable resin layer may not be smooth, resulting in poor adhesion.

The reinforcing agent layer is preferably carbon fiber, glass fiber or a mixture thereof impregnated with a polymer resin. The polymer resin may be impregnated with the carbon fiber, glass fiber, or a mixture thereof, and may be used without limitation as long as it is a polymer resin having appropriate malleability and ductility, but preferably epoxy resin, urethane resin, silicone resin, polypropylene, polyethylene , Polyvinyl chloride, phenol resin or polyethylene terephthalate can be used.

The carbon fiber may be a carbon fiber that is generally sold, but preferably carbon fiber including graphene, carbon nanotubes, graphite, or fullerene. As described above, when the carbon fiber includes graphene, carbon nanotubes, graphite, or fullerene, it may have a higher strength than conventional carbon fibers, so use it by mixing or consist of graphene, carbon nanotubes, graphite, or fullerene. Carbon fibers can also be used.

The carbon fiber and the glass fiber may have a thickness of 1nm ~ 1mm. The carbon fiber and the glass fiber have a smaller thickness, the higher the malleability and ductility of the sheet, but the lower the tensile strength. The larger the thickness, the smaller the malleability and ductility, but the higher the tensile strength. Therefore, it is preferable to select and use carbon fibers and glass fibers of appropriate thickness according to the size and pressure of the pipe to be used. In particular, as the size of the pipe increases, a sheet having high strength for reinforcement should be used, but since the curvature radius of the pipe increases, a sheet having low malleability and ductility can be used. It is preferable to use, and, on the contrary, when the thickness of the pipe becomes thinner, the radius of curvature decreases and the internal pressure decreases, so the use of a sheet comprising carbon fibers and glass fibers having a thin thickness with high malleability and high ductility and low tensile strength. It is possible. However, when the thickness of the carbon fiber and the glass fiber is less than 1 nm, the pipe reinforcement effect by the sheet is insignificant, and when it exceeds 1 mm, the malleability and ductility are very poor and it is impossible to adhere to the pipe.

The filler is mixed with the photo-curable polymer and is used for increasing the amount and strengthening properties. Aluminum oxide, zinc oxide, titanium oxide, carbon black, silicon oxide, talc or clay may be used, preferably aluminum oxide and zinc oxide. , Titanium oxide, silicon oxide, and most preferably aluminum oxide can be used.

In addition, the photo-curing sheet containing the reinforcing agent may be composed of an upper protective film, a first composite resin layer, a surface mat, a reinforcing agent layer, a second composite resin layer and a lower protective film, and the lower protective film is removed during work. Next, it is desirable to attach to the pipe and remove and cure the upper protective film, but if the upper protective film is a transparent or ultraviolet transmission film, it is also cured without removing the upper protective film and then the protective film is removed after a certain time. It is possible. In addition, since the photo-curing sheet containing the reinforcing agent is cured and cannot be used when exposed to light when transported or stored after manufacture, it is packaged with a film having light-shielding performance or loaded into a storage box having light-shielding power (see FIG. 6). ) Is preferred, and it is preferable to remove the light shielding film or storage box before use.

The photo-curing sheet containing the reinforcing agent may have a thickness of 0.1 to 5 mm. In the case of the photo-curing sheet containing the reinforcing agent, it is preferable to have an appropriate thickness since it is adhered to the outer surface of the pipe to perform jacketing. At this time, if the thickness of the sheet is less than 0.1mm, the jacketing effect is very poor, and when it exceeds 5mm, it is difficult to cure by ultraviolet rays, and the adhesive strength may be reduced.

The photo-curing sheet supplies a first carrier film from a first film supply unit; Applying the resin composition on the first carrier film; Supplying fibers on the first carrier film coated with the resin composition; Cutting the fiber at the fiber cutting portion; After applying the resin composition on the second carrier film supplied from the second film supply unit, the second carrier film and the first carrier film contact to form a sheet; And forming a photocured sheet by photocuring the sheet in the light irradiation part.

Figure 8 shows a photocuring sheet manufacturing process according to an embodiment of the present invention.

8, the photocuring sheet manufacturing apparatus used in the photocuring sheet manufacturing process includes a moving belt (not shown), a first film supply unit, a first resin supply unit, a fiber supply unit, a first fiber cutting unit, and a second fiber cutting unit. , A second film supply unit, a second resin supply unit, a light irradiation unit and a winding unit.

The moving belt is formed long in the longitudinal direction, and the first and second carrier films described later are moved along the longitudinal direction. The first and second film supply portions are spaced apart from each other on the upper portion of the moving belt, and the first and second carrier films are wound.

The 1st and 2nd resin supply part accommodates the above-mentioned resin composition for photocuring sheet manufacture (hereinafter, resin composition). The first and second resin supply units supply the resin composition to the first and second carrier films. Meanwhile, a doctor box (not shown) may be further provided for the first and second resin supply units, respectively. In the doctor box, the resin composition supplied from the first and second resin supply units is primarily accommodated, and the first and second carrier films are guided in the direction of the moving belt after being brought into contact with the bottom of the doctor box, by the moving belt. It is moved in one direction.

The fiber supply unit supplies fibers such as glass fiber, carbon fiber, carbon fiber, and aramid fiber on the first carrier film.

The fiber cutting part cuts the fiber into a predetermined length, and may include, for example, a rotary chopper. Meanwhile, a plurality of fiber cutting portions may be provided.

The light irradiation unit is for photocuring the resin composition, and light in various wavelength ranges may be irradiated to the sheet. Meanwhile, the light irradiation unit may irradiate X-rays as well as ultraviolet rays and visible rays.

The winding part winds up the photo-curing sheet of the form hardened by the light irradiation part.

As described above, in the photocuring sheet manufacturing process according to an embodiment of the present invention, the resin composition is supplied and applied to the first carrier film and the second carrier film supplied from the first and second film supply units to the moving belt, After the sheet is formed, it is photocured to produce a photo-curing sheet, which is wound.

In one embodiment, the first carrier film is supplied from the first film supply unit, and the resin composition is applied on the first carrier film. Then, after the fibers are supplied on the first carrier film, the fibers are cut to a predetermined size at the fiber cutting portion.

On the other hand, the second carrier film is supplied from the second film supply unit, and after the resin composition is applied on the second carrier film, the second carrier film is in contact with the first carrier film to form a sheet.

Thereafter, the sheet passes through the light irradiation part, and the resin composition is photocured to form a photocured sheet.

The photo-cured sheet whose manufacture is completed is wound up in a winding part.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described to be easily carried out by those of ordinary skill in the art. In addition, in the description of the present invention, when it is determined that a detailed description of a related known function or known configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, some features shown in the drawings are enlarged or reduced or simplified for ease of description, and the drawings and their components are not necessarily drawn to scale. However, those skilled in the art will readily understand these details.

Example  One

Raw materials were prepared in the ratio shown in Table 1 below, and all raw materials were purchased and used in an open market.

Material name unit weight UV-RESIN kg 34.5 Dispersant (BYK 9010) kg 0.2 FILLER kg 38.0 Colorant kg 0.7 Priority System (MGO-616 kg 1.6 Defoamer (A-555) kg 0.4 Glass fiber kg 25.0

The glass fiber used was 5 µm thick glass fiber, and aluminum oxide (product name ATH (H-WF-1)) was used as the filler.

Subsequently, in order to produce a photocurable sheet, a photocurable polymer was prepared by mixing a material other than glass fiber among the above materials, and glass fibers were dispersed between the photocurable polymer sheets to produce a photocurable sheet having a width of 1 m. The upper protective film (PET material) and the lower lining film (PE material) were attached to the upper and lower parts of the light-cured sheet, which had been fabricated, and then wound 10m each to the paper tube. After the winding was completed, the product was completed by wrapping it with a UV-blocking packaging film (black).

Example 2

It was carried out in the same manner as in Example 1, except that glass fibers and carbon fibers were mixed in a 5: 1 ratio instead of glass fibers.

Example 3

It was carried out in the same manner as in Example 1, except that silicon oxide was used as the filler.

Experimental example

The sheets prepared in Examples 1 to 3 were irradiated with ultraviolet rays for 10 minutes to cure, and then cut to 10 mmX70 mm to prepare specimens. The specimen was installed in a universal tester (FIG. 7 (a)) by clamping it with forceps having a spacing of 50 mm by 10 mm, and then measuring tensile strength, flexural strength, compressive strength, impact strength, and Barcol hardness. The measurement progress is shown in Table 2 below.

The tensile strength
(MPa) Flexural strength
(MPa) Compressive strength
(MPa) Impact strength
(KJ / ㎡) Bacol hardness
(J / m) Example 1 80.4 155.1 145.9 80.6 71.3 Example 2 85.7 161.8 159.4 82.1 72.5 Example 3 76.9 149.5 138.7 79.8 70.1

As shown in Table 2, compared to Example 1, Example 2 in which carbon fibers were mixed was found to have higher physical properties. However, due to the mixing of carbon fiber, the photo-curing sheet became black, and it was found that there would be limitations in using it as a jacket of various colors. In the case of Example 3, in which the filler was silicon oxide instead of aluminum oxide, although the physical properties were lowered overall, it was confirmed that the filler exhibited a usable level.

Example 4

Pipe jacketing experiments were performed using the photo-curing sheet prepared in Example 1. A glass wool insulation having a thickness of 1 cm was wrapped around a length of 450 cm on the outside of a pipe having a diameter of 10 cm and a length of 500 cm, and then fixed, and a jacket was installed using the photo-curing sheet produced in Example 1. The first photo-curing sheet was adhered by 50 mm longer than the heat-insulating material, and the photo-curing sheet to be attached afterwards was attached by overlapping the previously-attached photo-curing sheet by 50 mm. After the sheet was attached, curing was performed by installing an ultraviolet lamp emitting a wavelength of 360-420 nm at a 90 ° angle around the pipe. The curing was performed at 25 ° C for 10 minutes.

Example 5

In Example 4, instead of bonding the photocuring sheet 50 mm longer than the heat insulating material, 5 mm longer was adhered and carried out in the same manner.

Example 6

In Example 4, instead of adhering the photocured sheet 50 mm longer than the heat insulating material, 100 mm longer was adhered and carried out in the same manner.

Example 7

In Example 4, instead of attaching the photo-curing sheet to be previously attached by 50 mm, the 10 mm overlapping was performed in the same manner.

Example 8

In Example 4, instead of attaching the photocuring sheet to be previously attached in 50 mm increments, 80 mm overlapping was performed in the same manner.

Example 9

In Example 4, instead of the four UV lamps, two UV lamps were disposed at an angle of 180 ° around the center of the pipe, and the same procedure was carried out.

Example 10

It was carried out in the same manner as in Example 4, except that light curing was performed for 2 minutes.

Example 11

It was carried out in the same manner as in Example 4, except that light curing was performed for 20 minutes.

Example 12

In Example 4, instead of attaching the photo-curing sheets by overlapping by 30 mm, the side surfaces of each photo-curing sheet were attached to each other, and then the outside of the contacted surface was reinforced with a photo-curing sheet having a width of 70 mm.

Example 13

It was carried out in the same manner as in Example 12, except that the outside of the abutting surface was reinforced with a photo-curing sheet having a width of 10 mm.

Example 14

It was carried out in the same manner as in Example 12, except that the outside of the abutting surface was reinforced with a light-curing sheet having a width of 200 mm.

Experimental example

Weatherability experiments were conducted using the pipes and jackets produced in Examples 4-14. After the weathering experiment was exposed to a salt spray environment for a certain period of time (FIG. 7 (b)), corrosive substances were removed and the weight of the product was measured. . The results are shown in Table 3 below.

Weight loss rate (%) Salt infiltration Pipe corrosion Example 4 0.9 X X Example 5 0.9 ○ ○ Example 6 0.7 X X Example 7 0.8 ○ ○ Example 8 0.7 X X Example 9 3.4 ○ ○ Example 10 4.1 ○ ○ Example 11 0.9 X X Example 12 0.8 X X Example 13 0.7 ○ ○ Example 14 0.8 X X

As shown in Table 3, in the case of Example 9 using two UV lamps and Example 10 in which curing was performed for 2 minutes, it was confirmed that curing was not complete and the weight reduction rate was high. Specifically, in the case of Example 9, an uncured portion was observed in the 90 ° direction of the ultraviolet lamp with a small amount of ultraviolet irradiation, and corrosion and salt penetration were observed around this region. In addition, in the case of Example 10, it was confirmed that corrosion and salt penetration were observed in all directions, and thus the progress was not complete.

In addition, corrosion and salt penetration were observed in Example 5, in which only 5 mm longer than the thermal insulation material was applied during construction, in Example 7 with a narrow overlapping portion during overlap bonding, and in Example 13 with a narrow width of the reinforcing agent during butt construction. Specifically, in the case of Example 5, it was confirmed that the corrosion proceeded due to the infiltration of salt water at both ends, and in Examples 7 and 13, the salt was infiltrated into the area where the space was formed between the sheets.

Since the specific parts of the present invention have been described in detail above, it will be apparent to those of ordinary skill in the art that these specific techniques are only preferred embodiments, and the scope of the present invention is not limited thereby. will be. Accordingly, the substantial scope of the present invention will be defined by the appended claims and their equivalents.

1: 1st carrier film
2: Second carrier film
3: sheet
4: light curing sheet
10: first film supply unit
20: first resin supply unit
30: fiber supply unit
40: first fiber cutting portion
50: second fiber cutting portion
60: second resin supply unit
70: second film supply unit
80: light irradiation unit
90: winding part

Claims (12)

(A) attaching a photo-curing sheet comprising a reinforcing agent along the outer peripheral surface of the pipe;
(b) attaching another photocuring sheet along the outer peripheral surface of the pipe to which the photocuring sheet is not attached; And
(c) repeating the step (b) to complete the attachment of the photocuring sheet, followed by curing by irradiating light;
Pipe jacketing method using a photo-curing sheet comprising a.
According to claim 1,
A pipe jacketing method further comprising the step of attaching a heat insulating material to the outer peripheral surface of the pipe (a`) before the step (a).
According to claim 1,
The photocuring sheet of step (b) is a pipe jacketing method using a photocuring sheet, characterized in that the attached photocuring sheet and the width of 10 ~ 80mm overlap.
The method of claim 1
The photo-curing sheet of step (b) is attached adjacently so as not to overlap with the attached photo-curing sheet, and after attaching (b`) light, characterized in that it further comprises the step of reinforcing the adjacent surface of the photo-curing sheet Pipe jacketing method using hardened sheet.
According to claim 4,
The (b`) step is a pipe jacketing method using a photo-curing sheet, characterized in that the step of attaching and strengthening the photo-curing sheet having a width of 10 to 200 mm on the upper portion of the adjacent surface.
According to claim 1,
The light is a pipe jacketing method using a photo-curing sheet, characterized in that ultraviolet or sunlight having a wavelength of 360 ~ 420nm.
According to claim 1,
The step (c) of irradiating light and curing is irradiated with light for 2 to 20 minutes, and a pipe jacketing method using a photo-curing sheet is performed at -15 to 65 ° C.
According to claim 1,
The light-curing sheet containing the reinforcing agent is a pipe jacketing method using a photo-curing sheet, characterized in that it comprises a composite resin layer and a reinforcing agent layer.
The method of claim 8,
The reinforcing layer is a pipe jacketing method using a light-curing sheet, characterized in that the glass fiber, carbon fiber or a mixture thereof.
The method of claim 8,
The composite resin layer is a photo-curable polymer, a dispersing agent, a filler, a colorant, a thickener and an antifoaming agent, characterized in that it comprises a pipe jacketing method using a photo-curing sheet.
The method of claim 8,
The light-curing sheet containing the reinforcing agent is a pipe jacketing method using a light-curing sheet, characterized in that it consists of an upper protective film, a first composite resin layer, a surface mat, a reinforcing layer, a second composite resin layer and a lower protective film. .
According to claim 1,
The photocuring sheet
Supplying the first carrier film from the first film supply unit;
Applying the resin composition on the first carrier film;
Supplying fibers on the first carrier film coated with the resin composition;
Cutting the fiber at the fiber cutting portion;
After applying the resin composition on the second carrier film supplied from the second film supply unit, the second carrier film and the first carrier film contact to form a sheet; And
Forming a photo-curing sheet by photocuring the sheet in the light irradiation part
Pipe jacketing method using a photo-curing sheet, characterized in that produced by a manufacturing method comprising a.

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