JPH078939Y2 - Resin composite pipe and resin composite pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a resin composite pipe and a resin composite pipe joint, and in particular, has excellent strength, rigidity, corrosion resistance, heat resistance, pressure resistance and impact resistance. For example, the present invention relates to a resin composite pipe and a resin composite pipe joint which are preferably used for piping in a chemical plant where various high temperature chemicals are transported.

(Prior Art) Conventionally, as a resin composite pipe of this type, for example, Japanese Patent Publication No. 62-
The one disclosed in the publication 22038 is known.

This resin composite pipe has an extruded polyvinyl chloride pipe as a core material, and a roving made of a reinforcing material obtained by impregnating roving (for example, glass roving) with thermosetting resin on the entire circumferential surface of the core material. Align along the axial direction of the core material,
Next, the same reinforcing material as described above is wound around the surface in a loop shape in the circumferential direction of the core material, and the surface is melt-coated with a thermoplastic resin.

In the resin composite pipe thus formed, the outer layer is composed of the thermoplastic resin and the intermediate layer is composed of the fiber-reinforced thermosetting resin, so that the strength and the rigidity are high, the abrasion resistance and the handling property are excellent, and the core material is Despite being a polyvinyl chloride pipe that is weak against heat, it has many advantages such as being able to withstand temperatures of 85 to 90 ° C and being excellent in corrosion resistance due to the inherent properties of the polyvinyl chloride pipe.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional resin composite tube, since the intermediate layer made of the fiber-reinforced thermosetting resin is formed by the filament winding method, the following problems occur. there were.

The winding method of the roving in the intermediate layer is likely to vary, so that the tensile strength and the bending strength are partially changed to cause a weak strength portion.

A tightening force is applied to the core material, which causes compressive stress to be easily cracked by an external load, a flat force, or a falling body impact.

Since high tensile strength and high bending strength cannot be obtained, a large amount of reinforcing material is required to compensate for this, which increases the manufacturing cost and increases the pipe diameter.

In the piping work, when joining the pipe and the pipe joint, it is necessary to peel off the reinforcing layer of the resin composite pipe to expose the outer surface of the core material, but since the roving of the reinforcing layer is not knitted, the core material is particularly The roving wound in the circumferential direction remains partially attached to the outer surface of the core material, and it takes extra work time to remove it.

The present invention has been made in view of the above-mentioned conventional problems, and has high tensile strength and bending strength, constant strength throughout, no generation of compressive stress, and easy peeling of the reinforcing layer. An object of the present invention is to provide a resin composite pipe and a resin composite pipe joint which have excellent joining workability, use a small amount of a reinforcing material, and can reduce the manufacturing cost.

(Means for Solving the Problems) In order to achieve the above object, the resin composite pipe according to the present invention is
A thermoplastic resin tube is used as a core material, and a fiber reinforced thermosetting resin layer formed by impregnating a thermosetting resin into a glass roving cloth is formed on the outer peripheral surface of the core material. Is a glass roving and an extremely fine binding glass roving that is sufficiently finer than the glass roving, and the intervals between the glass rovings are close,
While weaving the outer material and the lining so that the spacing between the binding glass rovings is sparse, by crossing or adhering the binding glass rovings of both of them in places, these outer material and lining are both The glass rovings are integrated so as to be orthogonal to each other.

Further, the resin composite pipe joint according to the present invention uses a thermoplastic resin pipe joint as a core material, and a glass roving cloth is impregnated with a thermosetting resin on the outer peripheral surface of the core material to form a fiber-reinforced thermosetting resin layer. Wherein the glass roving cloth is formed by a glass roving and an extremely fine binding glass roving that is sufficiently finer than the glass roving, and the spacing between the glass rovings is close, and the binding glass is While weaving the outer fabric and the lining so that the spacing between the rovings becomes sparse, and by crossing the binding glass rovings of both of them in places, these outer fabric and the lining, both of the glass rovings are orthogonal. As described above, they are superposed and integrated.

(Function) Since the glass roving cloth in the present invention has the above-mentioned constitution, the surface roughness is much less than that of the one woven only with the glass roving of the same thickness, and therefore the resin accumulation is less likely to occur and the thermosetting property is high. The resin impregnability becomes high, and the amount of glass with respect to the laminated thickness when wound around the core material increases. Therefore, the tensile strength and the bending strength are high even though the amounts of the glass roving and the thermosetting resin used are small.

Further, since it can be uniformly laminated on the outer surface of the core material of the glass roving cloth, the strength does not vary, and when the core material is wound around, the tightening force is not applied to the core material.
No compressive stress is generated. Moreover, the peeling work becomes easy.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a layer structure of a resin composite pipe according to the present invention.

This resin composite pipe comprises a thermoplastic resin pipe 1 and a core material, and a thermosetting resin is applied to the glass roving cloth 2 on the outer peripheral surface of the core material.
The fiber-reinforced thermosetting resin layer 3 is formed by impregnating the same with the nonwoven fabric 4 impregnated with the thermosetting resin and wound around the outer peripheral surface thereof.

As the thermoplastic resin tube 1, a resin having a large polarity such as vinyl chloride resin, polyamide resin, acrylic resin,
Those molded from a polycarbonate resin or the like are preferable. The residual stress may be removed by subjecting the thermoplastic resin tube 1 to a heat treatment or the like in advance, in which case the thermoplastic resin tube 1 can be in a state capable of absorbing only external stress. The strength as can be increased.

An unsaturated polyester resin, an epoxy resin, or the like is preferably used as the thermosetting resin.

As shown in FIG. 2, the glass roving cloth 2 has a two-layer structure including a front material 21 and a back material 22. That is, the glass rovings 23 ..., 24 ... And the glass rovings 23 ..., 26 ...
Outer fabric 21 so that the spaces between each other, 24 ... are closely spaced, and the glass rovings for stitching 25 ...
And the lining 22 are woven, and the glass rovings 25, 26, for binding both sides are crossed or adhered to each other at places 27
By so doing, the front lining 21 and the backing 22 are superposed and integrated so that the glass rovings 23 and 24 on both sides are orthogonal to each other.

Next, a specific example of the glass roving cloth 2 will be shown, but the present invention is not limited to this.

・ Number of glass rovings (2300th count) 6 (number of 25 mm side of cloth) ・ Number of glass rovings for binding 3 (number of 25 mm side of cloth) ・ Cloth (outer fabric 21 + lining 22) Weight 1200 g / m ² · Thickness of cloth (outer fabric 21 + lining 22) 0.75 to 0.8 mm The glass rovings 23, 24, and the binding glass rovings 25, 25 are treated with silane, respectively. The glass fibers are bundled into one, but the glass rovings 25 ..., 26 ... for binding are used in such a manner that the rovings are extremely fine and finer than the glass rovings 23, 24. Is much smaller than the number of glass rovings 23, 24, 24.

The non-woven fabric 4 is used to improve the appearance and weather resistance of the resin composite tube, and is preferably made of polyester resin, for example. The nonwoven fabric 4 does not necessarily have to be used.

Next, a method of manufacturing the resin composite pipe as described above will be described with reference to FIG.

First, dirt and the like adhering to the outer peripheral surface of the thermoplastic resin tube 1 is wiped off using a solvent such as acetone.

Next, while the thermoplastic resin tube 1 is advanced in the axial direction while rotating around the axis thereof, the glass roving cloth 2 (striped woven fabric) is placed in the impregnation tank 6 containing the thermosetting resin 5. The glass roving cloth 2 is wound around the thermoplastic resin tube 1 by impregnating it with the thermosetting resin 5 and immersing it therein.

Subsequently, the glass roving cloth 2 wound as described above
The non-woven fabric 4 impregnated with the thermosetting resin 5 is wound on the above.

Finally, heat treatment is applied to the glass roving cloth 2
The thermosetting resin 5 impregnated in the non-woven fabric 4 and the non-woven fabric 4 is cured, and the whole process is completed.

In FIG. 3, reference numeral 7 is a guide roller for guiding the glass roving cloth 2, reference numeral 8 is an impregnation tank for impregnating the non-woven fabric 4 with the thermosetting resin 5, and reference numeral 9 is the non-woven fabric 4. A guide roller, reference numeral 10, indicates a support roller that rotatably supports the tube.

Next, the resin composite pipe joint according to the present invention will be described.

4 to 6 show each embodiment of the resin composite pipe joint of the present invention, FIG. 4 shows a cheese joint, FIG. 5 shows an elbow joint, and FIG. 6 shows a socket joint. In these figures, the same components as those of the resin composite pipe described above are designated by the same reference numerals.

Each of these pipe joints is the same as that of the resin composite pipe in other configurations and manufacturing methods except that the thermoplastic resin pipe joint 1 ′ which is the core material is molded into various pipe joint shapes. Therefore, the description thereof is omitted.

Next, the results of performance comparison between the resin composite pipe according to the present invention and the conventional resin composite pipe will be shown. In both cases, a hard vinyl chloride tube (outer diameter 165 mm, inner diameter 146 mm) was used as the core material.

As a conventional example, a roving (2300 count) was separately wound around the outer circumference of the core material while impregnating the thermosetting resin in the axial direction and the circumferential direction.

From the above table, it can be seen that the resin composite tube according to the present invention has a higher glass fiber content than conventional ones and is superior in both tensile strength and bending strength.

(Effects of the Invention) As described above, since the resin composite pipe and the resin composite pipe joint of the present invention use the glass roving cloth having the above-described structure, the tensile strength and bending strength are high, and The strength is constant throughout, no compressive stress is generated, and it has excellent impact resistance. Further, the fiber-reinforced thermosetting resin layer can be easily peeled off and has excellent workability in joining, and the amount of the fiber-reinforced thermosetting resin used can be small, so that the manufacturing cost can be reduced.

[Brief description of drawings]

The drawings show an embodiment of the resin composite pipe and the resin composite pipe joint according to the present invention. Fig. 1 is a perspective view showing the layer structure of the resin composite pipe, and Fig. 2 is a partially broken view showing the structure of the glass roving cloth. FIG. 3 is a schematic perspective view showing an example of a method for manufacturing a resin composite pipe, and FIGS. 4 to 6 are partially cutaway perspective views showing each embodiment of the resin composite pipe joint. 1 ... Thermoplastic resin pipe 1 '... Thermoplastic resin pipe joint 2 ... Glass roving cloth 21 ... Outer material 22 ... Lining 23, 24 ... Glass roving 25, 26 ... Splicing glass roving 5 ... Thermosetting resin

Claims (2)

[Scope of utility model registration request] 1. A fiber reinforced thermosetting resin layer comprising a thermoplastic resin tube as a core material and a glass roving cloth impregnated with a thermosetting resin on the outer peripheral surface of the core material. The glass roving cloth is composed of a glass roving and an extremely fine binding glass roving that is sufficiently finer than the glass roving, and the spacing between the glass rovings is close, and the spacing between the binding glass rovings is sparse. As such, while weaving the outer material and the lining material, by crossing or adhering both the binding glass rovings to each other in places, these outer material and the lining material are superposed and integrated so that the both glass rovings are orthogonal to each other. A resin composite tube characterized by being 2. A thermoplastic resin pipe joint is used as a core material, and a fiber reinforced thermosetting resin layer obtained by impregnating a thermosetting resin into a glass roving cloth is formed on the outer peripheral surface of the core material. The glass roving cloth is a glass roving and an extremely fine binding glass roving that is sufficiently finer than the glass roving, the spacing between the glass rovings is close, and the spacing between the binding glass rovings is sparse. While weaving the outer fabric and the lining so that both of the binding glass rovings intersect or adhere to each other in some places, the outer fabric and the lining are superposed and integrated so that the both glass rovings are orthogonal to each other. A resin composite pipe joint characterized in that