JPH0560277A - Fiber reinforced resin pipe - Google Patents

Abstract

PURPOSE:To enhance the adhesion between an inner core layer and a FRP layer and facilitate the peeling work of an EPR layer at the time of pipeline connection by providing glass fibers axially and circumferentially on a continued band body consisting of a fiber reinforced material. CONSTITUTION:On the surface of a core material 1 consisting of a thermoplastic resin tube, an adhesive layer 2 is formed, and a FRP layer and a coat layer 4 are successively laminated thereon to form a fiber reinforced resin pipe A. The FRP layer is formed, for example, by laminating a continued band body consisting of a fiber reinforced material impregnated with an ultraviolet hardened resin on the surface of the adhesive layer 2, enclosing a glass fiber impregnated with the ultraviolet hardened resin along the axial direction, and winding a glass fiber thereon. As the continued band body, a glass cloth is used. As the glass fiber to be laid on the glass cloth along the axial direction and the glass fiber to be circumferentially wound, roving glass is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fiber-reinforced resin pipe mainly used for transporting various chemicals, fluids for chemical industry, hot water, hot spring water and the like.

[0002]

2. Description of the Related Art Conventionally, as a resin composite pipe, for example, one disclosed in Japanese Patent Publication No. 62-22038 is known. This resin composite pipe has a hard vinyl chloride pipe as a core material, and its surface is coated with a fiber-reinforced thermosetting resin that has strength and rigidity in both the axial direction and the circumferential direction of the pipe, and the surface is further covered. It is coated with a thermoplastic resin selected from polyolefin and polyvinyl chloride.

[0003]

However, in this conventional resin composite pipe, the FRP layer is directly formed on the outer peripheral surface of the hard vinyl chloride pipe as the core material, and both are made of the thermosetting resin in the FRP layer. The resin composite tube is integrated by the adhesive force of 1. and there is a large variation in the adhesive force, so that there is a problem that the impact strength and the flat strength of the resin composite pipe are lowered. Further, in this resin composite pipe, since the glass fiber in the axial direction is attached to the outer periphery of the inner core and the glass fiber is further attached in the circumferential direction, the FR composite is used when connecting the pipes.
There is also a problem that the glass fibers are cut off when P is peeled off, and the glass fibers remain outside the inner core tube. The present invention has been made in view of such conventional problems, and an object thereof is to enhance the adhesion between the core material and the FRP layer and to facilitate the peeling work of the FRP layer at the time of pipe connection. It is to provide a fiber-reinforced resin pipe.

[0004]

As a means for solving the above-mentioned problems, in the fiber reinforced resin pipe of the present invention, a thermoplastic resin pipe is used as a core material, and an FRP is formed on the outside thereof with an adhesive layer interposed therebetween.
A fiber-reinforced resin tube having a layer and a coating layer formed thereon, wherein the FRP layer is formed by laminating a continuous strip made of a fiber-reinforced material impregnated with a thermosetting resin on the surface of an adhesive layer. , Adopts a structure in which glass fibers impregnated with a thermosetting resin are surrounded by them along the axial direction, and then the glass fibers are wound from above and then the thermosetting resin is cured. did.

[0005]

In the fiber reinforced resin pipe of the present invention, the adhesion between the core material and the FRP layer is strengthened, and the FRP at the time of pipe connection is connected.
It is possible to provide a fiber-reinforced resin pipe that facilitates the peeling work of layers.

[0006]

EXAMPLES Examples of the present invention will be described below.

The fiber-reinforced resin pipe A of this embodiment is formed on a core material 1 made of a thermoplastic resin pipe, an adhesive layer 2 formed on the surface of the core material 1, and on the adhesive layer 2. FRP layer 3
And a coating layer 4 formed on the FRP layer 3.

As the core material 1, polyvinyl chloride resin such as polyvinyl chloride resin and chlorinated polyvinyl chloride resin,
Polyamide resin, acrylic resin, polycarbonate resin, etc. are used.

The adhesive layer 2 is for improving the adhesion between the core material 1 and the FRP layer. In this embodiment, as the adhesive, for example, when the inner core layer is vinyl chloride resin,
It has been experimentally confirmed that the adhesiveness between the thermoplastic resin and the FRP layer is improved and the long-term heat resistance is improved, that is, a hydroxyl group terminal obtained by reacting diisocyanate and diol. Polyisocyanate and unsaturated polyester resin are blended with polyurethane resin, and the blending ratio of these is based on 100 parts by weight of 15% MEK solution of hydroxyl-terminated polyurethane resin (Desmocol 500 Sumitomo Bayer Urethane Co., Ltd.). , 20 parts by weight of 20% methylene chloride solution of triphenylmethane triisocyanate (TTI), and 50 to 300 parts by weight of unsaturated polyester resin are used. As the unsaturated polyester resin, HN201 (manufactured by Dainippon Ink and Chemicals, Inc.) and Yupica 4521APT (manufactured by Nippon Yupica Co., Ltd.) are used.

The FRP layer 3 is for providing strength and rigidity in both the axial direction and the circumferential direction of the core material 1. In this embodiment, the surface of the adhesive layer 2 is made of an ultraviolet curable resin (heat (Curable resin) impregnated with a continuous strip of fiber reinforced material, glass fiber impregnated with an ultraviolet curable resin (thermosetting resin) is surrounded along the axial direction,
Then, it is formed by winding glass fiber on it. Glass cloth is used as the continuous strip.
As the ultraviolet curable resin with which the continuous strip is impregnated, for example, a heat-resistant unsaturated polyester resin mixed with a photosensitizer is used. Roving glass is used as the glass fiber attached along the axial direction on the glass cloth and the glass fiber wound in the circumferential direction.

The coating layer 4 is for protecting the FRP layer 3, and is formed by laminating a continuous strip impregnated with a thermosetting resin on the FRP layer 3 in this embodiment. ing. A thermosetting unsaturated polyester resin is used as the thermosetting resin. A polyester non-woven fabric is used as the continuous strip.

Therefore, in the fiber-reinforced resin pipe of this embodiment, the core material and the FRP layer are bonded together with an adhesive and the FRP is
Since the glass cloth is laminated on the lowermost layer of the layers, the adhesion between the core material and the FRP layer is improved, and at the same time, the impact strength and flatness strength of this fiber reinforced resin pipe are also improved.
When the P layer is peeled off, the glass cloth does not break even if it is forcibly peeled off, and the peeling work can be carried out smoothly. or,
In the fiber-reinforced resin pipe of this example, since the outer layer of the FRP layer is covered with the continuous strip impregnated with the thermosetting resin,
By adding a pigment to this resin, the fiber-reinforced resin tube can be colored freely. Further, in the fiber-reinforced resin pipe of the present embodiment, the outer layer of the FRP layer is coated with a continuous strip in which the same kind of resin as the resin of the FRP layer is impregnated to form an F
Since the fiber-reinforced resin pipe having high adhesion between the RP layer and the coating layer is formed, the FRP layer can be peeled off once when connecting the pipes, and the workability is improved.

Next, a method for manufacturing the fiber-reinforced resin pipe of this embodiment will be described. The manufacturing method of the fiber reinforced resin pipe of the present embodiment includes an adhesive applying step of applying an adhesive to the outer peripheral surface of the core material, a continuous strip made of the fiber reinforcing material, and an FRP layer made of a thermosetting resin containing glass fibers. A continuous series of a manufacturing process, a coating layer manufacturing process using a thermosetting resin containing a continuous strip for coating the FRP layer, and an automatic cutting process for cutting the FRP composite pipe manufactured through the manufacturing process into a predetermined size. And the post-curing step of completely curing the FRP layer by supplying warm air for a certain period of time.

The respective steps will be described in order.
In the adhesive application step, stains and the like adhering to the outer peripheral surface of the core material made of a thermoplastic resin tube that is continuously supplied are wiped off with a solvent such as acetone, and then a hydroxyl group-terminated polyurethane resin, polyisocyanate And a non-saturated polyester resin, which is a three-component mixed substance, is applied to the outer peripheral surface of the mixture, and then the solvent is blown off with hot air to dry by touch.

Next, in the FRP manufacturing process, continuous strips made of fiber reinforced material in which an ultraviolet curable resin (thermosetting resin) is impregnated on the surface of the core material coated with the adhesive in the adhesive coating step are laminated. Then, the glass fiber impregnated with the ultraviolet curable resin (thermosetting resin) is surrounded along the axial direction,
Next, it refers to a step of winding glass fiber on the glass fiber and then curing the glass fiber in an ultraviolet curing furnace. In order to manufacture an FRP tube having excellent dimensional accuracy, it is preferable to adjust the outer diameter again with a shaping die before surface hardening with ultraviolet rays.

Next, in the coating layer manufacturing step, a continuous strip impregnated with a thermosetting resin is laminated on the FRP layer, and a release film is wound on the continuous strip to heat cure in an air-shielded environment. It refers to the process of hardening by passing through a furnace. A far infrared curing furnace is used as the heat curing furnace.

Next, the automatic cutting step is a step of automatically cutting the composite pipe consisting of the inner core layer, the FRP layer, and the coating layer, which are continuously manufactured in the above-mentioned step, into a certain length.

Next, the post-curing step is a step in which hot air is supplied for a certain period of time to completely cure the FRP layer. The release film is removed after this post-curing step.

Next, an apparatus for manufacturing the fiber-reinforced resin pipe of this embodiment will be described. The manufacturing apparatus of the fiber reinforced resin pipe of the present embodiment, an adhesive application unit for applying an adhesive to the outer peripheral surface of the core material made of a thermoplastic resin tube, a continuous strip made of fiber reinforced material and a glass fiber containing a glass fiber. FR by curable resin
An FRP layer manufacturing unit for manufacturing a P layer, a coating layer manufacturing unit for manufacturing a coating layer of a continuous strip impregnated with a thermosetting resin, and an automatic cutting device for cutting the FRP composite pipe manufactured by the manufacturing unit to a predetermined size. It is composed of a series of a series of devices including a cutting device, and a post-curing furnace for supplying the hot air for a certain period of time to completely cure the FRP layer.

The respective units will be described with reference to FIG. 2. In the adhesive application unit, the outer peripheral surface of the core material 1 made of a thermoplastic resin tube which is connected and continuous by a tape is made of a solvent such as acetone. A solvent brush 5 to be wiped and an adhesive application die 6 for applying an adhesive diluted with a solvent to the surface of the core tube 1.
And an adhesive drying device 7 which dries the solvent in the adhesive and dries it by touch.

Next, in the FRP layer manufacturing unit, the resin cloth impregnated layer 9 in which the glass cloth 8 is impregnated with the ultraviolet curable resin (thermosetting resin) and the core material 1 coated with the adhesive are mounted with a certain interval. Then, the ultraviolet curable resin (thermosetting resin)
The reversal guide 10 that is formed into a cylindrical shape by passing the glass cloth 8 impregnated with and is laminated on the surface of the adhesive layer 2 and the ultraviolet curable resin (thermosetting resin) are rolled.
A resin impregnation tank 12 for impregnating the bling glass 11, a roving guide 13 for enclosing the roving glass 11 along the axial direction of the core material 1, an excess resin squeezing out and roving glass 11 Drawing die 14 for removing the air and adjusting the outer diameter, a winding machine 16 for winding the roving glass 15, two ultraviolet curing furnaces 17, 17 in which a high pressure mercury lamp is arranged, and a take-off machine 18 It consists of and. If a shaping ring made of an elastic material is installed in front of the UV curing furnace, FR with excellent dimensional accuracy can be obtained.
The P tube can be continuously produced.

Next, the coating layer manufacturing unit is installed with a polyester non-woven fabric 19, a resin impregnated layer 20 for impregnating the non-woven fabric 19 with a thermosetting resin, and an FRP layer at a constant interval. The inversion guide 21 which is formed into a cylindrical shape by passing the nonwoven fabric 19 impregnated with and is laminated on the surface of the FRP layer, and the polyester-based nonwoven fabric 1
9 includes a film winding machine 23 that winds the release film 22 from above, and a far infrared curing furnace 24 that completes the curing reaction by passing the release film 22 under an air-shielding environment. The thermal curing furnace 24 is not limited to the far infrared curing furnace. In addition, in this embodiment, since the coating layer is formed under an air-shielded environment, it is possible to obtain a fiber-reinforced resin pipe having a clean appearance and excellent weather resistance and water resistance.

Next, the automatic cutting device 25 is for cutting the composite pipe continuously manufactured by the above-mentioned unit into a certain size.

Next, the post-curing furnace 26 is for supplying hot air for a certain period of time to completely cure the FRP layer.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and any modification within the scope of the invention is included in the present invention.

For example, although the coating layer 4 is made of a thermosetting resin in the above embodiment, it may be made of a thermoplastic resin.

[0027]

As described above, according to the present invention, peeling does not occur even when used in piping for high-temperature water, high impact strength and flat strength, and FR at the time of piping connection is obtained.
It is possible to obtain a fiber-reinforced resin pipe in which the P layer is easily peeled off and workability is improved.

Further, in the present invention, since the glass fibers in the axial direction and the circumferential direction are arranged and reinforced on the continuous strip made of the fiber-reinforced material, the glass fibers in the axial direction or the circumferential direction are reinforced. There is an effect that the fiber-reinforced resin pipe can be freely designed and manufactured according to the intended use by adjusting the amount.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a fiber reinforced resin pipe of this embodiment.

FIG. 2 is a side view showing an apparatus for manufacturing a fiber-reinforced resin pipe of this embodiment.

[Explanation of symbols]

 A fiber reinforced resin tube 1 core material 2 adhesive layer 3 FRP layer 4 coating layer 8 glass cloth (continuous strip) 11 glass fiber 15 glass fiber

Claims (1)

[Claims] 1. A fiber reinforced resin pipe comprising a thermoplastic resin tube as a core material, an FRP layer provided on the outer side thereof with an adhesive layer interposed therebetween, and a coating layer provided on the FRP layer, wherein the FRP layer is an adhesive layer. On the surface of the agent layer, a continuous strip made of fiber reinforced material impregnated with a thermosetting resin is laminated, on which glass fibers impregnated with a thermosetting resin are surrounded along the axial direction, and then on top of that. A fiber-reinforced resin pipe, which is formed by winding glass fiber from the above and then hardening a thermosetting resin.