JPH0587272A - Fiber reinforced plastic pipe - Google Patents

Abstract

PURPOSE:To enable a bonding between fluororesin and a thermosetting resign layer to be done and improve the weather resistance in a fiber reinforced plastic pipe with the thermosetting resin layer. CONSTITUTION:This fiber reinforced plastic pipe uses a thermosetting plastic pipe 6 as a core, and a fiber reinforced thermosetting resin layer 7 is formed on the outer circumferential surface of this core. In addition, it is made up of forming a polymer alloy layer 2 consisting of fluororesin and an acrylic resin layer on the outer circumferential surface of this fiber reinforced thermosetting resin layer 7.

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 having high heat resistance and high pressure resistance which can be used for outdoor piping, mainly in the field of plants.

[0002]

2. Description of the Related Art Steel pipes and lining steel pipes with high mechanical strength and rigidity have been used as plant piping materials that are required to have high heat resistance and high pressure resistance. Recently, they are lightweight and have good workability and chemical resistance. The core material is a thermoplastic resin with excellent resistance and abrasion resistance, and the surface of the core material is coated with a fiber-reinforced thermosetting resin that has strength and rigidity in both the axial and circumferential directions of the pipe. Further, a resin composite pipe whose surface is coated with a thermoplastic resin for improving abrasion resistance and handling property has been devised. (JP-A-56-167981)

[0003]

By the way, a resin composite pipe having a thermosetting resin layer has poor weather resistance depending on the curing conditions of the thermosetting resin layer, and in an outdoor pipe, the outer layer portion is cracked,
Abnormalities such as cracks may occur.

Therefore, there is a demand for a resin composite pipe having high weather resistance, high heat resistance, and high pressure resistance. The above resin composite pipe is
The outer surface coated with the fiber-reinforced thermosetting resin is further coated with a thermoplastic resin such as a fluororesin.

However, the coating of the above-mentioned thermoplastic resin is for improving abrasion resistance and handling property,
It is not intended to improve weather resistance, and since the fluorine-based resin is non-adhesive and non-adhesive, even if the fluorine-based resin is directly coated as it is, the adhesiveness with the thermosetting resin is poor. There is a problem.

In view of the above points, the present invention makes it possible to bond a thermosetting resin layer with a fluorocarbon resin and an acrylic resin as a polymer alloy or a two-layer resin layer and to form a thermosetting resin layer. The purpose is to improve the weather resistance of the fiber resin reinforced pipe.

[0007]

The fiber-reinforced resin pipe of the present invention comprises a polymer alloy layer made of a fluororesin and an acrylic resin, or an outer layer made of a fluororesin layer on the outer peripheral surface of the fiber-reinforced thermosetting resin pipe. The inner layer is a two-layer resin layer formed of an acrylic resin layer.

Further, a thermoplastic resin tube is used as a core material, a fiber-reinforced thermosetting resin layer is formed on the outer peripheral surface of the core material, and a fluorine resin and an acrylic resin are further formed on the outer peripheral surface of the fiber-reinforced thermosetting resin layer. It is characterized in that a polymer alloy layer made of a system resin layer or a two-layer resin layer having an outer layer made of a fluorine resin layer and an inner layer made of an acrylic resin layer is formed.

As the fiber-reinforced thermosetting resin pipe used in the present invention, a fiber-reinforced thermosetting resin pipe formed by a filament winding method or the like is preferably used. As the fluorine-based resin, for example, polyvinylidene fluoride resin, polytrifluoroethylene resin or the like is used, and as the acrylic resin, polymethylmethacrylate resin or the like is used.

As the fibers used in the fiber-reinforced thermosetting resin layer formed on the outer peripheral surface of the thermoplastic resin tube as the core material, glass fiber, carbon fiber, aramid fiber or other reinforcing fiber can be used. As the thermosetting resin, unsaturated polyester resin, epoxy resin or the like can be used.

The blending ratio of the polymer alloy of the fluorine resin and the acrylic resin is preferably about 70 to 150 parts by weight of the acrylic resin with respect to 100 parts by weight of the fluorine resin. Further, it is preferable that the fluorine-based resin or the polymer alloy of the fluorine-based resin and the acrylic resin is added with an ultraviolet absorber.

The thermoplastic resin pipe used as the core material is a general-purpose thermoplastic resin pipe using a general-purpose thermoplastic resin such as polyethylene resin, polypropylene resin, polyvinyl chloride resin, or higher heat resistance or chemical resistance. If required, polyetheretherketone resin,
An engineering plastic resin tube using an engineering plastic resin such as polyphenylene sulfide resin is used.

[0013]

[Function] By forming a polymer alloy layer of a fluororesin and an acrylic resin or a two-layer resin layer having an acrylic resin layer as an inner layer and a fluororesin layer as an outer layer on the outer peripheral surface of the thermosetting resin layer, It is possible to bond the fluororesin and the thermosetting resin.

Further, the fluorine resin in the polymer alloy layer or the two-layer resin layer prevents the fiber reinforced thermosetting resin layer from being deteriorated by ultraviolet rays.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings showing its embodiments. 1 and 2 show a polymer alloy layer made of a fluororesin and an acrylic resin on the outer peripheral surface of a fiber reinforced thermosetting resin pipe, or a two-layered outer layer made of a fluororesin layer and an inner layer made of an acrylic resin layer. 1 shows an example of a fiber-reinforced resin pipe of the present invention in which a resin layer is formed. FIG. 1 is a cross-sectional view of a fiber reinforced resin pipe in which a polymer alloy layer made of a fluororesin and an acrylic resin is formed on the outer peripheral surface of the fiber reinforced thermosetting resin pipe. FIG. 2 is a cross-sectional view of a fiber reinforced resin pipe in which a two-layer resin layer having a fluorine resin layer as an outer layer and an acrylic resin layer as an inner layer is formed on the outer peripheral surface of the fiber reinforced thermosetting resin pipe.

In FIG. 1, 1 is a fiber-reinforced thermosetting resin tube, and 2 is a polymer alloy layer formed by mixing a polyvinylidene fluoride resin and a polymethylmethacrylate resin. A polymer alloy layer 2 is formed on the outer peripheral surface of a fiber-reinforced thermosetting resin tube 1.

In FIG. 2, 3 is a polyvinylidene fluoride resin layer, and 4 is a polymethylmethacrylate resin layer. A polymethylmethacrylate resin layer 4 is formed on the outer peripheral surface of the fiber-reinforced thermosetting resin tube 1, and a polyvinylidene fluoride resin layer 3 is further formed on the outer peripheral surface thereof.

The polymer alloy layer 2 on the outer peripheral surface of the fiber-reinforced thermosetting resin tube 1 is, for example, a film-shaped polymer alloy film made of polyvinylidene fluoride resin and polymethylmethacrylate resin. It is formed by being wound around the fiber-reinforced thermosetting resin tube 1 before the 1 is cured. Regarding the method of winding the film, the bobbin of the film may be rotated at a constant speed with a certain angle, or the fiber-reinforced thermosetting resin tube 1 may be rotated.

If the film is wound before the thermosetting resin is cured, the curing reaction is promoted by blocking the outside air. Therefore, it is desirable to use the polymer alloy in the form of a film.

Two-layer resin layer 5 consisting of polyvinylidene fluoride resin layer 3 and polymethylmethacrylate resin layer 4
Is a two-layer film composed of a polyvinylidene fluoride resin and a polymethylmethacrylate resin formed into a two-layer film by a known coextrusion method, the outer layer is a polyvinylidene fluoride resin layer 3, and the inner layer is a polymethylmethacrylate resin layer 4.
The fiber-reinforced thermosetting resin pipe 1 is wound around the fiber-reinforced thermosetting resin pipe 1 before being cured so as to be formed.

In this embodiment, the polyvinylidene fluoride resin layer 3 and the polymethylmethacrylate resin layer 4 are formed to have substantially the same thickness. The two-layer film is preferably formed so that the polyvinylidene fluoride resin layer 3 has a thickness of about 0.7 to 1.5 times that of the polymethylmethacrylate resin layer 4.

When the two-layer film is wound around the fiber-reinforced thermosetting resin tube 1, it is desirable to wind the film in the same manner as in the case of the polymer alloy film. 3 and 4 show an embodiment of the fiber-reinforced resin pipe of the present invention in which the core material of the thermoplastic resin pipe is interposed in the fiber-reinforced thermosetting resin layer.

FIG. 3 is a cross-sectional view of a fiber reinforced resin pipe in which a polymer alloy layer made of a fluorine resin and an acrylic resin is formed on the outer peripheral surface of the fiber reinforced thermosetting resin layer. FIG. 4 is a cross-sectional view of a fiber-reinforced resin pipe in which a two-layer resin layer having a fluorine-based resin layer as an outer layer and an acrylic resin layer as an inner layer is formed on the outer peripheral surface of the fiber-reinforced thermosetting resin layer.

In FIGS. 3 and 4, reference numeral 6 is a thermoplastic resin tube as a core material, and 7 is a fiber-reinforced thermosetting resin layer. A fiber reinforced thermosetting resin layer 7 is laminated on the outer peripheral surface of the thermoplastic resin tube 6, and a polymer alloy layer 2 (FIG. 3) composed of a polyvinylidene fluoride resin and a polymethylmethacrylate resin or an outer layer is further formed on the outer peripheral surface thereof. A two-layer resin layer 5 (FIG. 4) composed of a polyvinylidene fluoride resin layer 3 and an inner layer of a polymethylmethacrylate resin layer 4 is formed.

The fiber-reinforced thermosetting resin layer 7 is laminated on the thermoplastic resin tube 6 as a core material by a filament winding method or the like. The method for forming the polymer alloy layer 2 or the two-layer resin layer 5 on the outer peripheral surface of the fiber reinforced thermosetting resin layer 7 is as follows. It is desirable to perform the same method as the method for forming the resin layer 5.

[0026]

EFFECTS OF THE INVENTION A two-layer resin layer having a polymer alloy layer of a fluororesin and an acrylic resin or an acrylic resin layer as an inner layer and a fluororesin layer as an outer layer is formed on the outer peripheral surface of a thermosetting resin layer. This makes it possible to bond the fluororesin and the thermosetting resin, and the fluororesin in the polymer alloy layer or the two-layer resin layer prevents deterioration of the fiber-reinforced thermosetting resin layer due to ultraviolet rays. As a result, the weather resistance of the fiber-reinforced resin pipe having the thermosetting resin layer can be improved.

By using a thermoplastic resin tube as the core material, a fiber-reinforced resin tube having excellent corrosion resistance can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a fiber reinforced resin pipe of the present invention.

FIG. 2 is a sectional view of another embodiment of the fiber reinforced resin pipe of the present invention.

FIG. 3 is a cross-sectional view of an embodiment of the fiber reinforced resin pipe of the present invention having a thermoplastic resin pipe as a core material.

FIG. 4 is a cross-sectional view of another embodiment of the fiber-reinforced resin pipe of the present invention having a thermoplastic resin pipe as a core material.

[Explanation of symbols] 1 fiber reinforced thermosetting resin tube 2 polymer alloy layer 3 polyvinylidene fluoride resin layer 4 polymethylmethacrylate resin layer 5 two layer resin layer 6 thermoplastic resin tube 7 fiber reinforced thermosetting resin layer

Claims (2)

[Claims] 1. A fiber-reinforced thermosetting resin tube, wherein
A fiber reinforced resin pipe comprising a polymer alloy layer made of a fluororesin and an acrylic resin, or a two-layer resin layer having an outer layer made of a fluororesin layer and an inner layer made of an acrylic resin layer. 2. A thermoplastic resin tube is used as a core material, a fiber-reinforced thermosetting resin layer is formed on the outer peripheral surface of the core material, and a fluororesin is added to the outer peripheral surface of the fiber-reinforced thermosetting resin layer. A fiber reinforced resin pipe comprising a polymer alloy layer made of an acrylic resin layer, or a two-layer resin layer having an outer layer made of a fluorine resin layer and an inner layer made of an acrylic resin layer.