JPH0612150B2 - Manufacturing method of composite pipe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for producing a composite pipe used for transportation of chemicals to which heat is not applied.

[Conventional technology and its problems]

Conventional plastic molded pipes and sometimes polyvinyl chloride molded pipes are widely used in many fields because they have excellent chemical resistance and are cheaper than metal pipes, but they have the drawback of low strength. It was Generally, in order to increase the strength of this plastic molded tube so as to withstand high pressure, it is sufficient to make it thick, but it becomes heavy and expensive, and it has not been possible to substitute for a metal tube.

[Problems to be solved by the invention]

The present invention has been made in view of the above problems, and an object of the present invention is to provide a composite pipe which has a high burst strength while reducing the weight, and which can be mass-produced with the same wall thickness, that is, can be pumped under high pressure with good mass productivity.

[Means for solving problems]

In order to achieve such an object, the present invention achieves such an object by winding a long prepreg 2 made of an ultraviolet curable resin around a molding pipe 3 which is extruded by an extrusion molding machine and sequentially transferred, while being wound around the molding pipe 3 while making a planetary motion. This is a method for producing a composite pipe, in which the prepreg 2 is hardened by curing.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. First
As shown in FIG. 1 (a), the composite pipe 1 of the present invention is obtained by winding a tape-shaped long prepreg 2 formed by impregnating a base material with an ultraviolet curable epoxy resin composition around a plastic molding pipe 3 without a gap. It is hardened. Examples of the plastic molding pipe 3 include a polyvinyl chloride molding pipe, a polyethylene molding pipe, and a polypropylene molding pipe.

As shown in FIG. 2, the UV-curable epoxy resin composition 4 is prepared by mixing, for example, an epoxy resin 5, an epoxy resin 6, and an organic compound 7 at 100 ° C., and then adding a photo-curing catalyst 8 thereto.
Was added and mixed at 100 ° C.

The materials and mixing ratios of the resins 5, 6, compound 7 and catalyst 8 are as follows, for example.

・ Resin 5: 12 parts by weight of Epicoat 828 (Yukaka Shell Epoxy Co., Ltd. Bisphenol A type epoxy resin) ・ Resin 6: Epicoat 1001 48 parts by weight (〃 〃 〃) ・ Compound 7: KBM202 2 parts by weight ( Shin-Etsu Chemical Co., Ltd. Diphenyldimethoxysilane) ・ Photocuring catalyst: UVE-1014 0.6 parts by weight (General Electric Co., Ltd. Propylene carbonate of triarylsulfonium salt)
50% solution) As the above-mentioned ultraviolet curable resin, in addition to the epoxy resin, a compound having a photopolymerizable group, for example, an acryloyl group,
Examples thereof include compounds having a methacryloyl group, an acrylamide group, a maleic acid diester group, an allyl group, a vinyl ether group, a vinylamino group, a glycidyl group, an acetylenically unsaturated group and the like.

In order to make the above ultraviolet curable epoxy resin composition 4 into a long prepreg 2, this is put in an impregnation tank 10 in a room without ultraviolet rays as shown in FIG. 3, and this impregnation tank 10 is heated by a heating device 11. Impregnation tank with tape-shaped substrate 12 made of a material that transmits ultraviolet rays such as glass cloth while being heated to 100 ° C
10 and then release paper 13 on the back of the impregnated substrate 12.
It is a product which is sent while hitting and is wound up on a reel 14.

A method for continuously manufacturing the composite pipe 1 of the present invention using the long prepreg 2 wound on the reel 14 will be described below.

In FIG. 4, reference numeral 15 is an extrusion molding machine for extruding and shaping the plastic molding pipe 3, which is extruded from the plastic molding pipe 3 in order.
The molding tube 3 transferred in the direction is first coated on its surface with a primer 16 having the same composition as the ultraviolet curable epoxy resin composition 4.
Is applied by an applicator 17, and then the long prepreg 2 unwound from the reel 14 is wound around the molded tube 3 on which the primer 16 is applied. In this case, reel 14 is molded tube 3
The prepreg 2 is wound around the forming tube 3 while performing a planetary motion around the. At this time, the release paper 13 is naturally wound and removed.
A pair of reels 14 may be provided if the prepreg winding speed is to be increased or if the prepreg 2 is to be wound in layers. Subsequently, the molded tube 3 around which the prepreg 2 is wound is irradiated with ultraviolet rays 19 by the ultraviolet irradiation furnace 18, and as a result, the prepreg 2 and the primer 16 are cured. The long composite pipe manufactured in this manner is cut to a predetermined size by the cutter 20, and thus the composite pipe 1 shown in FIG. 1 is obtained.

In the above description, the prepreg 2 is the semi-dry type using the release paper 13, but it may be the dry type. The prepreg 2 may be preheated by a dryer instead of applying the primer 16. Further, it goes without saying that a so-called wet prepreg 2 directly taken out from the impregnation tank 10 may be used. In this case, the primer applying step or the preheating step is unnecessary.

1 (b) shows an example of a composite pipe 1 in which a prepreg 2 using a glass cloth as a base material 12 is wrapped around a forming pipe 3, and FIG. 1 (c) also uses the same base material 12. An example of the composite pipe 1 in which the prepregs 2 are wound at intervals is shown, and thus the burst strength of the molded pipe 3 is different depending on the difference in the winding density of the prepregs 2. That is, the higher the winding degree, the stronger the burst strength, and as a result, high-pressure transportation becomes easier. However, the material cost will become cheaper as it is roughly wound.

FIG. 1 (d) shows an example in which a roving in which glass fiber single fibers are aggregated is used as the base material 12.

In the present invention, the prepreg is not necessarily impregnated, but includes a compound containing chopped strands and the like. This compound containing chopped strands is, for example, a sheet formed by pressing a chopped strand between two resin films coated with an ultraviolet curable resin (in this case, the chopped strand may be a mat) Alternatively, a kneaded mixture of chopped strands and an ultraviolet curable resin composition is extruded into a resin film into a sheet form, and further a mixture of an ultraviolet curable resin and chopped strands is extruded into a sheet or linear form. Any one such as a molded one may be used.

The composite tube 1 thus obtained has a very high burst strength because the prepreg 2 which is very robust in the cured state is wound around the molded tube 3.

Therefore, if the required strength is the same as that of the conventional tube, it is possible to use the molded tube 3 having an extremely thin wall thickness, and the weight can be remarkably reduced. Further, if the molded pipe 3 has the same wall thickness as the conventional pipe, the burst strength is high, so that a large amount, that is, high pressure pumping is possible. Moreover, as described above, since the composite pipe 1 can be continuously produced,
Mass productivity is extremely high. Further, since the molded pipe 3 which is the main body of the present composite pipe 1 can use a low-priced plastic molded pipe, it is extremely inexpensive.

〔effect〕

As described above, according to the present invention, since the prepreg of the ultraviolet curable resin is wound while being extrusion-molded, it is possible to reduce the weight, and the rupture strength is extremely high. There is an effect that a low cost and high strength composite pipe can be obtained.

[Brief description of drawings]

1 (a), (b), (c), and (d) are perspective views of various composite pipes,
FIG. 2 is an explanatory view showing a method for producing the ultraviolet-curable resin composition according to the present invention, FIG. 3 is an explanatory view showing a method for producing the long prepreg, and FIG. 4 is a schematic view showing a method for producing the composite pipe. FIG. 1 ... Composite tube, 2 ... prepreg, 3 ... plastic molded tube, 4 ... UV curable epoxy resin composition.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Mikuni 1456 Samacho, Hachioji, Tokyo Within ThreeBond Co., Ltd. (56) References JP-A-56-164291 (JP, A) JP-A-50-83815 (JP) , A)

Claims (1)

[Claims] 1. A long prepreg of an ultraviolet curable resin is wound around a molded pipe while being planetary-moved around a molded pipe extruded by an extrusion molding machine and sequentially transferred, and then irradiated with ultraviolet rays to cure the prepreg. A method of manufacturing a composite pipe.