JPH0624202Y2 - Resin composite pipe and resin composite pipe joint - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is a chemical plant excellent in strength, rigidity, corrosion resistance, heat resistance, pressure resistance, impact resistance, etc. The present invention relates to a resin composite pipe and a resin composite pipe joint that are preferably used for the pipes and the like.

(Prior Art) Conventionally, as this type of resin composite pipe, for example, Jitsuko Sho 30
Those disclosed in Japanese Patent No. 6159 and Japanese Utility Model Publication No. 49-77245 are known.

The former is one in which glass fibers are wound around the outer peripheral surface of a hard vinyl chloride pipe, and a polyester resin is impregnated and hardened in the glass fibers to be integrated. The resin composite pipe thus obtained has the advantage that it is excellent in acid resistance and alkali resistance due to the hard vinyl chloride pipe, and also has excellent mechanical strength and heat resistance due to the glass fiber reinforced polyester resin layer as the outer layer, so-called FRP layer. have.

On the other hand, the latter is a fiber-reinforced thermoset by winding glass fiber impregnated with a thermosetting resin such as polyester resin or epoxy resin around the outer surface of a hard vinyl chloride pipe including a heat-resistant vinyl chloride pipe and an impact-resistant vinyl chloride pipe. A resin (FRP) layer is formed, and a resin layer which can be adhered by a one-component adhesive such as an adhesive for connecting polyvinyl chloride pipes is further provided thereon. The resin composite pipe thus obtained has an acid resistance and an alkali resistance which are excellent due to the internal hard vinyl chloride pipe, and mechanical strength and heat resistance which are due to the FRP layer, and the resin layer which can be bonded to the outermost layer. This makes it possible to perform connection work using a normal quick-drying one-component adhesive for connecting vinyl chloride pipes without the need for troublesome connection auxiliary work such as thread cutting, tapering or overlapping when connecting pipes. It also has the advantage of excellent piping workability.

(Problems to be solved by the invention) However, in each of the above-mentioned conventional resin composite pipes, the FRP layer is directly formed on the outer periphery of the hard vinyl chloride pipe that is the core material, and both are thermosetting in the FRP layer. Although they are integrated by the adhesive force of the resin, the adhesive force is limited and the adhesiveness between the two is low, so that there are the following problems.

That is, the coefficient of linear expansion of the hard vinyl chloride pipe of the core material and that of the FRP of the outer layer are largely different (the hard vinyl chloride pipe has about 7 × 10 ⁻⁵ / ° C., whereas the FRP has about 2-3 × 1).
(0 ^-5 / ° C), the stretching force of the hard vinyl chloride pipe easily causes delamination between the two, which causes the reinforcing effect of the FRP layer to be lost, and the hard vinyl chloride pipe is There is a problem that the rigid vinyl chloride pipe will buckle if it rises and cracks, or if the negative pressure increases as the temperature inside the pipe increases. Then, there is a problem that such a crack or buckling 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 conventional resin composite pipe, the surface of the hard vinyl chloride pipe is subjected to sanding treatment or the like to roughen the surface so that the hard vinyl chloride pipe and the FRP layer are formed. We are trying to improve the adhesive strength between
The sanding process has many working steps and is troublesome, and since a large amount of powder of the hard vinyl chloride pipe is generated, there is a problem that the working environment becomes very bad.

The present invention has been made in view of the above-mentioned conventional problems, and does not require sanding treatment, and moreover, the adhesive force between the thermoplastic resin pipe and the pipe joint as the core material and the fiber-reinforced thermosetting resin of the outer layer is improved. It is an object of the present invention to provide a resin composite pipe and a resin composite pipe joint which are large and particularly excellent in pressure resistance, heat resistance, impact resistance and the like.

(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 obtained by impregnating glass fibers with a compound containing an unsaturated polyester resin and an isocyanate compound is formed on the outer peripheral surface of the core material. .

Further, the resin composite pipe joint according to the present invention has a thermoplastic resin pipe joint as a core material, and a fiber obtained by impregnating glass fiber with a compound containing an unsaturated polyester resin and an isocyanate compound on the outer peripheral surface of the core material. A reinforced thermosetting resin layer is formed.

(Function) Since the compound containing the unsaturated polyester resin and the isocyanate compound has high adhesiveness to the thermoplastic resin,
The fiber-reinforced thermosetting resin layer impregnated with this compound has very high adhesion to the thermoplastic resin pipe and the pipe joint. For this reason, delamination between the two becomes less likely to occur, the reinforcing effect of the fiber-reinforced thermosetting resin on the thermoplastic resin pipe and the pipe joint is sufficiently obtained, and heat resistance and pressure resistance are enhanced. Further, since the isocyanate compound in the fiber-reinforced thermosetting resin layer suppresses shrinkage during curing of the unsaturated polyester resin, the tightening force for the thermoplastic resin pipe and the pipe joint of the fiber-reinforced thermosetting resin layer is weakened, The occurrence is small and the impact resistance is high.

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 tube has a thermoplastic resin tube 1 as a core material, and a fiber-reinforced thermosetting resin obtained by impregnating glass fiber 2 with a compound containing an unsaturated polyester resin and an isocyanate compound on the outer peripheral surface of the core material. The layer 3 is formed.

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 thermoplastic resin tube 1 may be preliminarily subjected to a heat treatment or the like to remove the residual stress, so that the thermoplastic resin tube 1 can be in a state capable of absorbing only external stress. The strength as can be increased.

The compound to be impregnated in the glass fiber 2 in the previous period is a compound obtained by reacting an unsaturated polyester with an isocyanate compound, and is a compound containing an isocyanate group and having excellent adhesiveness. The following formula is a reaction formula in the case of reacting unsaturated polyester with hexamethylene diisocyanate as an isocyanate compound.

The isocyanate compound used in the present invention is not limited to the above hexamethylene diisocyanate, and other examples include polyisocyanate, tolylene diisocyanate represented by the following structural formula, and diphenylmethane-4,4'-diisocyanate.

The mixing ratio of the unsaturated polyester and the isocyanate compound is preferably the following ratio, but is not limited to this.

Unsaturated polyester resin 100 parts by weight Isocyanate compound 10 to 100 parts by weight Methyl ethyl ketone peroxide 1 to 2 parts by weight Cobalt naphthenate 2 parts by weight In the above formulation example, methyl ethyl ketone peroxide is a curing agent and cobalt naphthenate is an accelerator. Respectively act as.

Examples of the glass fiber 2 include roving cloth,
Examples thereof include glass cloth, chopped strand mat, roving strand, and filament mat.

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 using a solvent such as acetone.

Next, the glass fiber 2 is immersed and passed through an impregnation tank 5 containing a compound 4 containing an unsaturated polyester and an isocyanate compound to impregnate the above compound, and the glass fiber 2
Is wound around the thermoplastic resin tube 1.

Finally, heat treatment is performed to cure the compound impregnated in the glass fiber 2, and the whole process is completed.

2, reference numerals 6 ... Denote guide rollers for guiding the glass fibers 2, and reference numerals 7 ... Denote support rollers for rotatably supporting the tube.

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

3 to 5 show each embodiment of the resin composite pipe joint of 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 resin composite pipe described above are designated by the same reference numerals.

Each of these pipe joints is a thermoplastic resin pipe joint 1'that is a core material.
Since other configurations and manufacturing methods are the same as in the case of the resin composite pipe except that is molded into various pipe joint shapes, description thereof will be omitted.

The shape of the joint is not limited to that shown in the drawings, and various shapes such as a socket joint may be used.

(Effects of the Invention) As described above, the resin composite pipe and the resin composite pipe joint of the present invention have a fiber-reinforced thermosetting resin layer obtained by impregnating glass fiber with a compound containing an unsaturated polyester resin and an isocyanate compound. Is formed on the outer peripheral surfaces of the thermoplastic resin pipe and the pipe joint, the adhesion between the thermoplastic resin pipe and the pipe joint and the fiber-reinforced thermosetting resin layer is very high, and the thermoplastic resin is heated by the heat. Only the pipe and the pipe joint do not expand and contract, and the fiber-reinforced thermosetting resin layer also expands and contracts. Therefore, delamination is unlikely to occur between the two, and the reinforcing effect of the fiber-reinforced thermosetting resin on the thermoplastic resin pipe and the pipe joint is sufficiently exerted, and the heat resistance and pressure resistance are excellent, and the pipe pressure and temperature are excellent. There is no risk that the thermoplastic resin pipe and the pipe joint will be cracked due to the increase in the temperature, or that the thermoplastic resin pipe and the pipe joint will buckle due to the increase in the negative pressure due to the increase in the temperature inside the pipe. Moreover, since the isocyanate compound in the fiber-reinforced thermosetting resin layer suppresses the shrinkage of the unsaturated polyester resin during curing, the tightening force on the thermoplastic resin pipe and the pipe joint is weakened, and the stress is reduced to reduce the impact resistance. It becomes higher, and cracks due to the impact of falling weights are less likely to occur.

[Brief description of drawings]

FIG. 1 shows an embodiment of a resin composite pipe and a resin composite pipe joint according to the present invention, FIG. 1 is a perspective view showing a layer structure of the resin composite pipe, and FIG. 2 is a schematic showing an example of a method for manufacturing the resin composite pipe. 3 and 5 are partially cutaway perspective views showing respective embodiments of the resin composite pipe joint. 1 ... Thermoplastic resin pipe 1 '... Thermoplastic resin pipe joint 2 ... Glass fiber 3 ... Fiber reinforced thermosetting resin layer 4 ... Impregnation layer 5 ... Compound containing negative saturated polyester resin and isocyanate compound

Claims (2)

[Scope of utility model registration request] 1. A fiber-reinforced thermosetting resin layer formed by using a thermoplastic resin tube as a core material, and impregnating glass fiber with a compound containing an unsaturated polyester resin and an isocyanate compound on the outer peripheral surface of the core material. A resin composite tube characterized by being made. 2. A fiber reinforced thermosetting resin layer obtained by impregnating glass fiber with a compound containing an unsaturated polyester resin and an isocyanate compound on the outer peripheral surface of a thermoplastic resin pipe joint as a core material. A resin composite pipe joint characterized by being formed.