JPH01288692A - Fiber reinforced resin pipe - Google Patents

Abstract

PURPOSE:To prevent the generation of a crack between layers by providing an adhesive layer between a plurality of resin-impregnated fiber layers having mutually different fiber winding angles. CONSTITUTION:An inner layer 1 having a fiber winding angle of + or -0 deg.-+ or -40 deg. and an outer layer 2 having a fiber winding angle of + or -50 deg.-+ or -90 deg. are formed by winding resin-impregnated fiber around the outer peripheral face of a man drel. In this case, an adhesive layer 3 is interposed between the inner layer 1 and outer layer 2. Thereby, a fiber-reinforced resin pipe 10 can be obtained. The adhesive layer 3 is formed with rubber or resin, being of a material with a lower elastic modulus than the matrix resin of the inner layer 1 and outer layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fiber-reinforced resin pipe that prevents cracks from forming between layers.

[Prior art]

In a fiber-reinforced resin pipe made of multiple resin-impregnated fiber layers made by winding resin-impregnated fibers around the outer circumferential surface of a mandrel, if the fiber winding angles of each layer are different from each other, the radial coefficient of thermal expansion will be different from each other.

That is, when the fiber winding angle (fiber angle with respect to the axial direction of the mandrel) is 0°, the coefficient of thermal expansion in the radial direction is maximum, and as the angle increases, the coefficient of thermal expansion gradually decreases, and the coefficient of thermal expansion gradually decreases as the angle increases.
At 0°, it becomes almost zero (no expansion). therefore,
If the coefficient of thermal expansion in the radial direction of the outer layer is smaller than that of the inner layer, cracks will occur between the inner layer and the outer layer when thermally expanded in the radial direction. ).

[Purpose of the invention]

An object of the present invention is to provide a fiber-reinforced resin pipe that prevents cracks from forming between layers.

[Structure of the invention]

Therefore, the gist of the present invention is to provide a fiber-reinforced resin pipe comprising a plurality of resin-impregnated fiber layers with different fiber winding angles and an adhesive layer interposed between these layers. It is.

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is an explanatory cross-sectional view showing an example of a fiber-reinforced resin pipe of the present invention. In Figure 1, 1 indicates that the fiber winding angle is ±0.
Inner layer of °~±40°, 2 has a fiber winding angle of ±50°~
This is the outer layer of ±90°. The inner layer 1 and the outer layer 2, which have different fiber winding angles, are formed by winding resin-impregnated fibers around the outer peripheral surface of a mandrel (not shown). In this case, an adhesive layer 3 is interposed between the inner layer 1 and the outer layer 2. As a result, a fiber-reinforced resin pipe 10 is obtained.

The adhesive layer 3 is made of rubber or resin, and is a material having a lower elastic modulus than the matrix resin of the inner layer 1 and the outer layer 2. Specifically, for example, it is a resin composition prepared by blending a terminal carboxyl-modified epoxy resin adhesive with appropriate additives as required. The thickness of this adhesive layer 3 is not particularly limited, but is 0.1 mm to 0.3 mm.
That's about it.

The resin-impregnated fibers constituting the inner layer 1 and the outer layer 2 are obtained by soaking the fibers in a resin and impregnating the fibers with the resin. As the resin in this case, for example, polyester resin, epoxy resin, etc. are used. The fibers are, for example, inorganic fibers such as carbon fibers and glass fibers, and organic fibers such as polyester, aromatic polyamide, and nylon.

In the fiber-reinforced resin pipe 10 of the present invention formed in this way, when contracted in the radial direction, the outer layer 2 is a hoop layer (the fiber winding angle is 90°), and the inner layer 1 has a fiber winding angle of 40°.
Even if the inner layer 1 shrinks, the adhesive layer 3 absorbs the deformation caused by the shrinkage, so that no cracks occur between the inner layer 1 and the outer layer 2.

This fiber-reinforced resin pipe 10 can be used as a pressure vessel such as an Aqua Lung bong, a propane gas bong, etc. by sealing both ends as in conventional products.

〔Effect of the invention〕

As explained above, according to the present invention, since the adhesive layer is interposed between the plurality of resin-impregnated fiber layers, it is possible to prevent cracks from occurring between the layers, so that the pressure resistance is significantly improved when used as a pressure vessel. improves. Furthermore, since the adhesive layer acts as a barrier layer, leakage of the pressure medium can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory cross-sectional view showing an example of a fiber-reinforced resin pipe of the present invention. 1... Inner layer, 2... Outer layer, 3... Adhesive layer, 10
...Fiber-reinforced resin pipe. Agent Patent Attorney Nobuo Ogawa −

Claims (1)

[Claims] A fiber-reinforced resin pipe comprising a plurality of resin-impregnated fiber layers with different fiber winding angles, and an adhesive layer interposed between these layers.