JP3147931B2 - Resin composite pipe and resin composite pipe joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to strength, rigidity, corrosion resistance,
The present invention relates to a resin composite pipe and a resin composite pipe joint which are excellent in heat resistance, pressure resistance, impact resistance and the like, and are preferably used for piping of a chemical plant for transporting various high-temperature chemicals, for example.

[0002]

2. Description of the Related Art Conventionally, as a resin composite pipe of this type, for example, Japanese Utility Model Publication No. 30-6159 and Japanese Utility Model Application Laid-Open No. 49-772 have been proposed.
No. 45 is known.

[0003] In the former, a glass fiber is wound around an outer peripheral surface of a hard vinyl chloride pipe, and this is impregnated and cured with a polyester resin to be integrated. The resin composite tube thus obtained has the advantage of being excellent in acid resistance and alkali resistance due to the rigid vinyl chloride tube, and also having excellent mechanical strength and heat resistance due to the outer glass fiber reinforced polyester resin layer, so-called FRP layer. are doing.

On the other hand, in the latter, a glass fiber impregnated with a thermosetting resin such as a polyester resin or an epoxy resin is wound around an outer peripheral surface of a hard vinyl chloride tube including a heat-resistant vinyl chloride tube and an impact-resistant vinyl chloride tube. Reinforced thermosetting resin (F
RP) layer, and further provided thereon a resin layer that can be bonded with a one-component adhesive such as an adhesive for connecting polyvinyl chloride pipes. The resin composite tube thus obtained is excellent in acid resistance and alkali resistance due to the hard vinyl chloride tube inside, and excellent in mechanical strength and heat resistance by the FRP layer, and furthermore, by the adhesive resin layer provided in the outermost layer, Piping work, such as performing connection work using a quick-drying one-liquid adhesive for connecting ordinary polyvinyl chloride pipes without performing complicated connection-related work such as threading, tapering or overlapping when connecting pipes It has the advantage that it is also excellent.

[0005] However, in the above-mentioned resin composite tube, the outer peripheral surface of the rigid vinyl chloride tube, which is the core material, is
The RP layer is directly formed, and both are integrated by the adhesive force of the thermosetting resin in the FRP layer. However, since the adhesive force is limited and the adhesiveness between the two is low, the following is possible. There was a problem.

[0006] That is, the coefficient of linear expansion of the hard vinyl chloride pipe of the core material and the FRP of the outer layer are significantly different (the rigid vinyl chloride pipe is about 7 × 10 ^-5 / ° C, while the FRP is about 2 × 10 ^-5 / ° C. (3 × 10 ⁻⁵ / ° C.), the delamination easily occurs between the two due to the elasticity of the rigid PVC pipe, and the reinforcing effect of the FRP layer is lost. There has been a problem that the rigid vinyl chloride pipe is flattened when the pipe is cracked due to an increase in temperature, or when the negative pressure increases as the temperature in the pipe increases. Then, there is a problem that such a crack or flattening of the hard vinyl chloride pipe causes a decrease in strength against an external load.

Further, in order to solve such a problem, in the above-mentioned resin composite pipe, the surface of the hard vinyl chloride pipe is subjected to a sanding treatment or the like to make the surface rough, so that the hard vinyl chloride pipe and the FRP layer are formed. However, the sanding process requires a lot of work steps and is troublesome, and the work environment becomes very poor due to the large amount of hard PVC pipe powder generated. there were.

In order to solve such a problem, the applicant of the present invention disclosed in Japanese Utility Model Laid-Open Publication No. 2-88740, in which a sanding treatment is not required, and a thermoplastic resin pipe and a pipe joint as a core material and an outer layer are disclosed. The present invention provides a resin composite pipe and a resin composite pipe joint which have a large adhesive force with a fiber-reinforced thermosetting resin and are particularly excellent in pressure resistance, heat resistance, impact resistance and the like.

The resin composite pipe and the resin composite pipe joint are made of a fiber-reinforced thermosetting material obtained by impregnating glass fibers with a compound containing an unsaturated polyester resin and an isocyanate compound on the outer peripheral surface of a thermoplastic resin core material. A resin layer is formed.

[0010]

However, even in the above-mentioned resin composite pipe provided by the applicant, for example, the temperature inside the pipe greatly changed under high pressure (for example, -10 ° C to 90 ° C) was repeated. In this case, cracks may be generated due to the influence, or a delamination phenomenon may occur at the interface between the core material and the fiber-reinforced thermosetting resin layer.

In view of the above, the present invention requires that the initial value of the tensile shear adhesive strength between the core material and the fiber-reinforced thermosetting resin layer at 23 ° C. be 120 kgf / cm ² or more so as to withstand even severer conditions. Tensile shear bond strength at 23 ° C. after prolonged high-temperature treatment at 90 ° C. for 1000 hours is 100 kgf / cm ² or more, 95 ° C. for 2 hours, followed by −10 ° C. for 2 hours and 95% again.
The object is to provide a resin composite pipe and a resin composite pipe joint having extremely high performance such as a tensile shear adhesive strength at 23 ° C of 100 kgf / cm ² or more after 100 cycles of cooling and heating at 100 ° C for 2 hours. And

[0012]

Means for Solving the Problems To achieve the above object, a resin composite pipe and a resin composite pipe joint according to the present invention have a thermoplastic resin pipe or a thermoplastic pipe joint as a core material, and an outer peripheral surface of the core material. Wherein a fiber-reinforced thermosetting resin layer is formed via an adhesive layer, wherein the adhesive layer comprises a polyol, a tolylene diisocyanate (hereinafter abbreviated as TDI) and a hexamethylene diisocyanate. (Hereinafter abbreviated as HDI-based) two types of polyisocyanates, wherein the mixing ratio of these polyols and polyisocyanate composition is 100 parts by weight of polyol. 10 to 80 parts by weight of the composition, and the distribution of both the TDI-based and HDI-based polyisocyanates in the polyisocyanate composition. Ratio was assumed to have been the HDI system 10 parts by weight relative to TDI-based 10 parts by weight.

[0013]

The adhesiveness between the core material and the fiber-reinforced thermosetting resin layer is obtained by using a polyisocyanate composition comprising two types of TDI-based and HDI-based polyisocyanates in the above-mentioned mixing ratio for the adhesive layer. It was confirmed by experiments that the heat resistance was improved and the long-term heat resistance was improved. Although the mechanism is not clear at present, one TDI-based polyisocyanate constituting the polyisocyanate composition contributes to the improvement of the above-mentioned adhesion, and the other HDI-based polyisocyanate contributes to the improvement of long-term heat resistance. it seems to do.

[0014]

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 tube has a thermoplastic resin tube 1 as a core material, and a fiber reinforced thermosetting resin layer 3 formed on an outer peripheral surface of the core material with an adhesive layer 2 interposed therebetween.

The thermoplastic resin tube 1 is preferably formed of, for example, a polyvinyl chloride resin such as a polyvinyl chloride resin or a chlorinated polyvinyl chloride resin, or a polyamide resin, an acrylic resin, or a polycarbonate resin. Further, the resin may be molded from a resin composition in which a stabilizer, a plasticizer, and the like are blended with these resins.

Incidentally, the thermoplastic resin tube 1 may be subjected to heat treatment or the like in advance to remove residual stress, so that the thermoplastic resin tube 1 can be brought into a state where only the external stress can be absorbed. The strength as a resin composite tube can be further increased.

The fiber-reinforced thermosetting resin layer 3 is obtained by impregnating a reinforcing fiber with a thermosetting resin. As this fiber, for example, roving cloth, glass cloth,
Chopped strand mat, roving strand,
In addition to glass fibers such as filament mats, carbon fibers and aramid fibers are preferably used.

The thermosetting resin includes, for example, unsaturated polyester resin, phenol resin, epoxy resin, urea resin, melamine resin, alkyd resin, silicone resin, polyimide resin and the like.

The adhesive forming the adhesive layer 2 includes a polyol and a polyisocyanate composition obtained by blending two types of polyisocyanates, TDI and HDI.

The mixing ratio of the polyol and the polyisocyanate composition is 10 to 80 parts by weight of the polyisocyanate composition per 100 parts by weight of the polyol.

The mixing ratio of both TDI-based and HDI-based polyisocyanates in the above-mentioned polyisocyanate composition is such that HDI-based 1-10
Parts by weight.

The polyol used in the present invention includes, for example, polyester polyol, acrylic polyol, epoxy-modified polyol and the like.

Next, a method for manufacturing the above-described resin composite pipe will be described.

First, the thermoplastic resin tube 1 serving as a core material is annealed at, for example, 80 ° C. for 30 minutes, and then dirt or the like adhering to the outer peripheral surface is wiped with a solvent such as acetone.

Next, the adhesive diluted with an appropriate solvent is applied to the outer peripheral surface of the thermoplastic resin tube 1. Here, as the solvent, for example, ethyl acetate, butyl acetate, methylene chloride, toluene and the like are suitably used.

Subsequently, after the adhesive 2 was dried by touching the adhesive,
The fiber reinforced thermosetting resin layer 3 is formed as shown in FIG. That is, the reinforcing fibers 31 are immersed and passed through the impregnation tank 4 containing the thermosetting resin liquid 32 to impregnate the resin fibers 32, and the reinforcing fibers 31 are wound around the thermoplastic resin tube 1. I do.

Finally, a heat treatment is performed to cure the thermosetting resin impregnated in the reinforcing fibers 31, and the entire process is completed.

In FIG. 2, reference numerals 5...
Reference numeral 6 denotes a guide roller for guiding the tube 1, and reference numerals 6 ... denote support rollers for rotatably supporting the tube.

The method for forming the fiber-reinforced thermosetting resin layer 3 may be, for example, a hand lay-up method, a spray-up method, or the like, in addition to the above-described filament winding method.

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

3 to 5 show embodiments of the resin composite pipe joint according to the present invention. FIG. 3 shows a cheese joint, FIG. 4 shows an elbow joint, and FIG. 5 shows a socket joint. In these figures, the same components as those of the above-described resin composite tube are denoted by the same reference numerals.

Each of these pipe joints is the same as the above-described resin composite pipe except for the point that the thermoplastic resin pipe joint 11 as a core material is molded into various pipe joint shapes. Therefore, the description is omitted.

The shape of the joint is not limited to the illustrated example, but may be various shapes.

Next, the resin composite pipe according to the present invention is described above.
Tests were conducted to determine whether or not the required performance listed in Table 1 was satisfied.
The result was that all three were satisfactory.

For comparison, the adhesive layer containing a polyol and one of a TDI-based or HDI-based polyisocyanate was used (Comparative Example 1).
The same test was also performed for 3). The results are also shown in Table 1.

The test pieces used for the measurements in each of the above tests were shaped as shown in FIG. In this figure, reference numeral 1 denotes a core material (thermoplastic resin), 2 denotes an adhesive layer, and 3 denotes a fiber-reinforced thermosetting resin layer.

[0039]

[Table 1]

[0040]

As is clear from Table 1, the resin composite pipe and the resin composite pipe joint of the present invention have extremely high adhesion between the core material and the fiber-reinforced thermosetting resin layer, and particularly have a high heat resistance for a long time. Even if the tube is exposed to water or the temperature inside the tube changes greatly under high pressure, cracks occur or delamination occurs at the interface between the core material and the fiber-reinforced thermosetting resin layer. There is no such thing.

Further, since the adhesive of the present invention has a strong adhesive force to the thermoplastic resin, it is possible to omit the conventionally required sanding treatment for the core material before applying the adhesive. Therefore, there is an effect that the number of manufacturing steps can be reduced and the cost can be reduced.

Further, although the detailed reason is unknown, a notch is provided at the end of the pipe at the time of connecting the pipe and heat treatment is performed so that the fiber-reinforced thermosetting resin layer of the section can be very easily formed from the core material. Can be peeled.

[Brief description of the drawings]

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

FIG. 2 is a schematic perspective view showing an example of a method for manufacturing a resin composite pipe according to the present invention.

FIG. 3 is a partially cutaway perspective view showing one embodiment of the resin composite pipe joint according to the present invention.

FIG. 4 is a partially cutaway perspective view showing another embodiment of the resin composite pipe joint according to the present invention.

FIG. 5 is a partially cutaway perspective view showing still another embodiment of the resin composite pipe joint according to the present invention.

6A and 6B show test pieces used for various performance tests, wherein FIG. 6A is a plan view, FIG. 6B is a front view, and FIG. 6C is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermoplastic resin pipe 2 Adhesive layer 3 Fiber reinforced thermosetting resin layer 11 Thermoplastic resin pipe joint

Claims (2)

(57) [Claims] 1. A thermoplastic resin tube having a core as a core material, and a fiber-reinforced thermosetting resin layer formed on an outer peripheral surface of the core material with an adhesive layer interposed therebetween, wherein the adhesive layer comprises a polyol. And a polyisocyanate composition obtained by blending two kinds of polyisocyanates of a tolylene diisocyanate type and a hexamethylene diisocyanate type, and the blending ratio of the polyol and the polyisocyanate composition is based on 100 parts by weight of the polyol. The polyisocyanate composition is 10 to 80 parts by weight, and the blending ratio of both the tolylene diisocyanate-based and hexamethylene diisocyanate-based polyisocyanates in the polyisocyanate composition is such that 1 to 10 parts by weight of diisocyanate A resin composite tube. 2. A core material comprising a thermoplastic resin pipe joint, and a fiber-reinforced thermosetting resin layer formed on an outer peripheral surface of the core material via an adhesive layer, wherein the adhesive layer comprises: Polyol, including a polyisocyanate composition obtained by blending two kinds of polyisocyanates of tolylene diisocyanate-based and hexamethylene diisocyanate-based, the blending ratio of these polyols and polyisocyanate composition,
The polyisocyanate composition is 10 to 80 parts by weight with respect to 100 parts by weight of the polyol, and the blending ratio of the tolylene diisocyanate and the hexamethylene diisocyanate in the polyisocyanate composition is 10 Hexamethylene diisocyanate based on 1 to 10 parts by weight
A resin composite pipe joint characterized by being a weight part.