JPH0825506A - Synthetic resin pipe material - Google Patents

Abstract

PURPOSE:To enable browning of a surface of a synthetic resin pipe of an inner layer and occurring of its fine cracks to be prevented by intercepting ultraviolet rays of sunlight by a method wherein a coated layer of a specific thickness consisting of an nonwoven fabric and a thermosetting resin is provided onto an outer peripheral side of the synthetic resin pipe material. CONSTITUTION:In a synthetic resin 1, a coated layer 4 wherein an nonwoven fabric consisting of a polyester resin is impregnated with an unsaturated polyester resin is provided onto a surface of a rigid vinyl chloride pipe 2, and a release agent (grease) 3 is provided between the rigid vinyl chloride pipe 2 and the coated layer 4. The coated layer 4 of an outer layer of the synthetic resin pipe section 1 must have a thickness of 0.2-2.0mm. When it is 0.2mm or under, the coated layer may be broken when a fiber is wound thereon. When strength is low and the thickness is 2.0mm or over, its peeling off is troublesome. Further, through the thickness is not 2.0mm or over, ultraviolet rays of sunlight can be intercepted. Small consumptions of a fiber of the fiber reinforced resin layer and of a thermosetting resin surface, and a cost can be controlled low.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin pipe and a synthetic resin pipe joint which are suitably used for transporting various fluids outdoors.

[0002]

2. Description of the Related Art As a means for transporting various fluids, a synthetic resin composite pipe which is lightweight and has excellent corrosion resistance and strength is used. These are obtained by reinforcing the outer circumference of a synthetic resin tube made of a thermoplastic resin or the like with a coating layer made of glass fiber rovings (rovings) and a thermosetting resin. When connecting these pipes, it is necessary to make a notch in the coating layer on the outer periphery of the synthetic resin pipe with a saw, peel off the coating layer to expose the end of the synthetic resin pipe, and connect it to the pipe joint. (Japanese Patent Laid-Open No. 4-191584).

When a synthetic resin pipe such as vinyl chloride resin or chlorinated vinyl chloride resin is used outdoors for a long period of time,
There were problems such as browning of the tube surface and generation of minute cracks due to the ultraviolet rays of sunlight.

[0004]

[Problems to be Solved by the Invention] The outer periphery of a synthetic resin tube made of a thermoplastic resin or the like is covered with glass fiber roving (roving).
A material reinforced with a coating layer composed of a thermosetting resin is effective for preventing browning of the tube surface and generation of minute cracks due to ultraviolet rays of sunlight such as vinyl chloride resin.
However, when the outer diameter of the synthetic resin pipe is 38 mm, the thickness of the conventionally used outer peripheral coating layer is 2.5 mm or more.
It was 3.0 mm, it was difficult to peel it off, and the peelability of the coating layer was poor. Also, it did not require this thickness to block the ultraviolet rays of sunlight. Further, there is a problem in that it is difficult to manufacture a thin coating layer with roving of glass fiber (roving) because of poor impregnation property.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and a covering layer made of a nonwoven fabric and a thermosetting resin having a thickness of 0.2 to 2.0 mm is provided on the outer peripheral side of a synthetic resin pipe material. Is provided.

The coating layer of the outer layer of the synthetic resin pipe material of the present invention must be 0.2 to 2.0 mm. If it is 0.2 mm or less, it may be cut when the fiber is wound, the strength is low, and if it is 2.0 mm or more, it is troublesome to peel it off. Even if it is possible to block the ultraviolet rays of sunlight, the amount of fibers and thermosetting resin used in the fiber-reinforced resin layer can be small,
The cost can be kept low.

The non-woven fabric is a cloth produced by mechanically, chemically and thermally treating a fibrous sheet (web) without passing through the form of a yarn, and joining the fibrous sheet (web) with the adhesive or the fusion force of the fibers themselves. A synthetic fiber nonwoven fabric such as polyester fiber nonwoven fabric and a natural fiber nonwoven fabric such as cotton are preferably used. The same material as the thermosetting resin,
Further, the impregnation property is good, which is preferable.

As the synthetic resin pipe, a general-purpose resin pipe such as a polyvinyl chloride pipe, a chlorinated polyvinyl chloride pipe, a polyethylene pipe, a polypropylene pipe, an ABS (acrylic-butadiene-styrene) copolymer pipe, or PEEK (polyether pipe). −
Engineering plastic pipes such as ether ketone) pipes and PPS (polyphenylene sulfide) pipes are used.

As the thermosetting resin, unsaturated polyester resin, ester resin, acrylic resin, epoxy resin and the like are preferably used. Between the synthetic resin pipe material and the coating layer of the outer layer, a release layer such as grease, starch paste, a film made of polyethylene or polyester, or a tube may be provided.
Furthermore, it is preferable because it facilitates the peeling of the outer coating layer.

[0010]

The synthetic resin pipe material of the present invention is provided with a coating layer made of a non-woven fabric and a thermosetting resin on the outer peripheral side of the synthetic resin pipe material. It blocks the ultraviolet rays of sunlight that cause cracks. Further, since the non-woven fabric is excellent in impregnating property, an extremely thin layer (
2 to 2.0 mm) can be easily manufactured, and since it is an extremely thin layer, it is easy to peel off and has excellent peelability.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a synthetic resin pipe of the present invention.

That is, in the synthetic resin pipe 1, a coating layer 4 formed by impregnating a non-woven fabric made of polyester resin with an unsaturated polyester resin is provided on the surface of the hard vinyl chloride pipe 2 to cover the hard vinyl chloride pipe 2. The release agent (grease) 3 is provided between the layer 4 and the layer 4. The coating layer 4 has a thickness of 1.5 mm.

The non-woven fabric was produced by mechanically treating a fiber sheet (web) made of polyester resin and joining the fibers by the fusion force of the fibers themselves. Next, an example of a method for manufacturing a synthetic resin pipe material will be described.

First, grease is applied to the surface of the synthetic resin tube 1. Then, a synthetic resin tube 1 coated with grease by impregnating an unsaturated polyester resin containing an ultraviolet curing agent with a nonwoven fabric made of polyester resin in an impregnation tank
To be laminated. Next, these layers are irradiated with ultraviolet rays in an ultraviolet curing oven to cure these layers.

Since the non-woven fabric and the thermosetting resin are the same material, the impregnating property is good, no bubbles are generated, and the workability is good. The manufactured synthetic resin pipe of the present invention was piped in a place where it was actually exposed to sunlight, and the weather resistance was examined. As a result, even after one year, the inner surface of the synthetic resin tube was not browned or had microscopic cracks.

[0016]

[Effect] Since the synthetic resin pipe material of the present invention is provided with the covering layer made of the non-woven fabric and the thermosetting resin on the outer peripheral side of the synthetic resin pipe material, it blocks the ultraviolet rays of the sunlight and the inner layer of the synthetic resin pipe material is blocked. Prevents browning of the tube surface and generation of minute cracks. Further, since the non-woven fabric has excellent impregnability, an extremely thin layer (0.2 to 2.0 mm) can be easily manufactured. Since it is an extremely thin layer, it is easy to peel off and has excellent peelability.

[Brief description of drawings]

FIG. 1 is a perspective view of a synthetic resin pipe of the present invention.

[Explanation of symbols]

 1 Synthetic resin pipe 2 Hard vinyl chloride pipe 3 Release agent (grease) 4 Coating layer

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Claims (1)

[Claims] 1. A synthetic resin pipe material comprising a synthetic resin pipe material having a coating layer made of a nonwoven fabric and a thermosetting resin and having a thickness of 0.2 to 2.0 mm provided on the outer peripheral side of the synthetic resin pipe material.