JPH0919969A - Method for forming reinforced resin layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a layer thick and uniform and to eliminate voids and pin holes by providing a process in which a setting resin composition to be a reinforced resin layer is supplied on the surface of a base material rotating around an axis and a process in which a net-shaped material is wound continuously onto the base material entraining the resin composition associated with the rotation of the base material. SOLUTION: A setting resin composition 5 supplied to a FRPM pipe 1 (base material) which reaches a thickness controlling plate material 4 associated with the rotation of the FRPM pipe 1 is made uniform to have a prescribed thickness by the plate material 4. A net 6 wound into a roll is wound continuously onto the surface of the resin composition 5 immediately after being made uniform by the plate material 4, and then the resin composition 5 is cured. Next, ring-shaped spacers 2, 2 are removed from the FRPM pipe 1, and seal rubber is bonded to the end part of the FRPM pipe 1, obtaining a reinforced plastic composite pipe for a propulsion process with a reinforced resin layer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for forming a reinforced resin layer.

[0002]

2. Description of the Related Art Lamination when fixing branch pipes of a pipe is complicated because the pipe itself has a T-shape or L-shape and the number of moldings having the same diameter is small, so that it is difficult to mechanize the molding. The current situation is that they rely on hand lay-up molding by hand. Also, as a method of forming a reinforced resin layer of a desired thickness around the base material, annular spacers are attached to both ends of the processing raw pipe as the base material, and while rotating the processing raw pipe about its axis, the annular spacer The curable resin composition, which is a reinforced resin layer having a predetermined viscosity and thixotropicity, is supplied to the surface of the raw material pipe between the ring-shaped spacer and the annular spacer, and a plate material for controlling the thickness of the raw material pipe as the raw material pipe rotates. The curable resin composition supplied is leveled to form a curable resin composition layer having a predetermined thickness,
The present inventor has already proposed a method for curing this curable resin composition (see Japanese Patent Application No. 6-288189).

According to this method, unlike the conventional hand lay-up molding method or spray-up method, the reinforced resin layer does not vary in thickness and a smooth reinforced resin layer can be obtained, and a glass fiber nonwoven fabric is formed. It has an excellent advantage that an operator does not need to perform a troublesome work of pressing the glass fiber with a roller every time it is stuck to sufficiently impregnate the glass fiber with the curable resin composition.

[0004]

However, in manual lay-up molding, the thickness may be uneven and non-uniform. Further, in the method previously proposed by the present applicant, the curable resin composition supplied is completely free from dropping when it passes the thickness control plate material, so that curing with sufficient viscosity is performed. Even if a resin composition is used,
If the supply amount of the curable resin composition is increased in order to obtain a thick reinforced resin layer, it may fall. In addition, air entrapment may occur, which may cause separation between the raw processing tube and the reinforced resin layer, and voids or pinholes may be formed on the surface.

On the other hand, if the reinforced resin layer is molded around the base material by using a mold, the above problem can be solved, but it requires large-scale equipment and is not practical. The present invention solves the conventional problems as described above, a curable resin composition does not fall during molding and after molding, and is thick, uniform, and has a void or pinhole-free reinforced resin layer. It is an object of the present invention to provide a method for forming a reinforced resin layer that can be obtained without increasing manufacturing costs.

[0006]

In order to achieve such an object, the method for forming a reinforced resin layer according to claim 1 of the present invention is a method for forming a reinforced resin layer having a desired thickness around a substrate. There is a step of supplying a curable resin composition to be the reinforced resin layer on the surface of a base material that rotates about an axis, and a net-like material to form the curable resin composition with the rotation of the base material. A configuration is provided that includes a step of continuously winding on the base material while winding.

In the above structure, it is preferable that the net-like material is wound around the base material while the curable resin composition is rolled up by pressing the netting material toward the base material with a pressing member.

Examples of such a curable resin composition include a curable resin, a curing agent and a curing accelerator, and, if necessary, a reinforcing material and other additives. The curable resin is not particularly limited, but for example, unsaturated polyester resin, polyester resin,
Epoxy resin etc. are mentioned.

The curing agent is not particularly limited, but for example, methyl ethyl ketone peroxide,
Benzoyl peroxide and the like. The curing accelerator is not particularly limited, but examples thereof include cobalt naphthenate, manganese naphthenate, and dimethylaniline.

The reinforcing material is not particularly limited, but examples thereof include inorganic fiber materials such as glass roving, glass chop and carbon fiber, and organic fiber materials such as aramid fiber, polyester fiber and vinylon fiber. The additives are not particularly limited, but anhydrous silica powder, calcium carbonate, glass balloons, talc and the like can be mentioned.

Further, as the curable resin composition, it is preferable to use a curable resin composition having a viscosity of 5 to 60 poise and a thixotropy of 3 to 10 as described in claim 3. That is, when the viscosity exceeds 60 poises, the curable resin composition is less likely to be deformed, so that the surface property deteriorates, and when it is less than 5 poises, the net-like material may fall from the mesh.

On the other hand, if the thixotropy is less than 3, the curable resin composition is liable to sag and may fall from the mesh of the net-like material. Therefore, the surface property may be deteriorated.

Further, the method for supplying the curable resin composition is as follows:
Although not particularly limited, examples thereof include an extrusion method using a cylinder and a spraying method using a spray.

The net-like material is not particularly limited as long as it has an impregnating property with the curable resin composition. For example, an organic fiber net represented by polyester or the like or an inorganic fiber net represented by glass net. Is mentioned.
The net-like material has a coverage of 3 per unit surface area, although it varies depending on the viscosity and thixotropic property of the curable resin composition.
It is preferably 0% or less and the basis weight is 200 g / m ² or less.
That is, if the coverage exceeds 30%, the curable resin composition may not impregnate the net-like material, and the delamination phenomenon may occur, and if the basis weight exceeds 200 g / m ² , the curable resin composition is the same. The material does not impregnate the net-like material, which may cause delamination phenomenon.

The lattice spacing of the net-like material varies depending on the viscosity of the curable resin composition. However, when the viscosity is 5 poises,
It is preferably 10 mm or less. That is, if it exceeds 10 mm,
The curable resin composition may drip from the gaps between the lattices. Further, when the viscosity is 60 poise, 50 mm or less is preferable, and considering the working surface, 30 mm or less is optimal.

The pressing means may be, for example, a resin or metal roller such as polyacetal or an elastic plate material such as rubber.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention is to add an additive, a curing agent, a glass fiber and the like to an unsaturated polyester resin, to provide a viscosity of 5 to 60 poise and a thixotropy of 3 to 10. The curable resin composition is supplied onto the base material, and while the base material is rotated, the glass net is wound from above the curable resin composition as the base material rotates, and the glass net is pressed by the pressing roller. Then, the curable resin composition is cured with the curable resin composition being pressed by the glass net.

That is, the curable resin composition supplied onto the base material is prevented from falling from the surface of the base material by winding the glass net from above, and the curable resin composition is protected by the glass net. Since it is pressed down from above, it sticks to the substrate. In particular, by pressing the glass net with a pressing roller, the glass net is impregnated with the curable resin composition, and the surface becomes smoother.

And a viscosity of 5-60 poise and a viscosity of 3-
By using the curable resin composition having thixotropy of 10, the cured resin composition does not drop, is deformed well by the inclusion of the net-like material, and smoothly enters between the meshes of the net-like material.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. (Example 1) As shown in FIG. 1, a diameter 600 serving as a base material.
After fitting the annular spacers 2 made of rubber rings with a thickness of 9 mm to both ends of the FRPM pipe (raw pipe for processing) 1 mm mm and length 2500 mm, two pairs of rubber rollers 31 provided on the pedestal 3 , 31 received the annular spacers 2, 2.

The rubber rollers 31 and 31 are driven to rotate and F
Since the RPM tube 1 was not slowly rotated around its central axis, the peripheral surface of the exposed portion of the FRPM tube 1 was roughened by a grinder. Next, diagonally upward along the axial direction of the reinforced plastic pipe 1, the length of 2440 mm made of steel,
The thickness control plate-like material 4 having a width of 200 mm and a thickness of 2 mm is set so as to be separated from the outer peripheral surface of the FRPM pipe 1 by a distance of 9 mm in thickness of the annular spacers 2 and 2 using the outer peripheral surfaces of the annular spacers 2 and 2 as guides. I placed it.

After that, the FRPM tube 1 is attached to the rubber roller 3
FR between the annular spacer 2 and the annular spacer 2 while rotating in the direction of the arrow by driving 1, 31, 31, 31
A curable resin composition 5 having the following composition and physical properties was supplied to the surface of the PM1 tube from an extrusion type supply device.

[Composition of Curable Resin Composition] Unsaturated polyester resin (Polylite FS-130-N, manufactured by Dainippon Ink and Chemicals, Inc.) ... 100 parts by weight Additive (200, manufactured by Nippon Aerosil Co., Ltd.) ... 100 Parts by weight Curing agent (methyl ethyl ketone peroxide) 0.5 parts by weight Glass chop (1150 TEX, 8 mm length) 14 parts by weight

[Physical Properties of Curable Resin Composition] Viscosity ... 30 Poise Thixotropic ... 6 (JIS K 6901)

Next, with the rotation of the FRPM tube 1, the curable resin composition 5 supplied onto the FRPM tube 1 which has reached the thickness control plate material 4 is made to have a thickness of 9 mm by the thickness control plate material 4. Averaged out. Then, a net (Kurashiki Spinning Co., Ltd., Crennet, lattice spacing 7 mm) 6 wound on a roll is continuously wound around the surface of the curable resin composition 5 immediately after being leveled by the thickness controlling plate material 4, The curable resin composition 5 was cured.

Next, the annular spacers 2 and 2 are removed from the FRPM tube 1, and a sealing rubber is adhered to the end of the FRPM tube 1 to provide a reinforced resin layer 8 as shown in FIG. P was obtained. The composite tube thus obtained was sliced into rings, and the state of the interface between the FRPM tube 1 and the reinforced resin layer 8 was observed. Moreover, there was almost no variation in the thickness of the reinforced resin layer 8.

(Embodiment 2) Similar to Embodiment 1, a FRPM pipe (working raw pipe) 1 having a diameter of 600 mm and a length of 2500 mm, which is a base material, has annular spacers 2 and 2 having a thickness of 8 mm at both ends.
After fitting, the rubber roller 3 provided on the frame 3
1, 31 received the respective annular spacers 2.

After that, the FRPM pipe 1 is replaced with the rubber roller 31 by a spray type supply device instead of the extrusion type supply device.
The curable resin composition 5 having the following composition and physical properties was thinly sprayed onto the entire surface of the FRPM tube 1 between the annular spacers 2 while rotating in the direction of the arrow by driving 31. Then, while continuously winding a net (Kureshiki Spinning Co., Ltd., lattice spacing 7 mm) 6 wound on a roll, the curable resin composition 5 was further applied by a spray type supply device.
Was continuously sprayed until the thickness of the curable resin composition layer became 8 mm, and then the curable resin composition 5 was cured.

Next, the annular spacers 2 and 2 were removed from the FRPM pipe 1, and seal rubber was adhered to the end of the FRPM pipe 1 to obtain a reinforced plastic composite pipe P for the propulsion method. The composite pipe P thus obtained is sliced into FRPM pipes 1
When the state of the interface between the and the reinforced resin layer 8 was observed, it was in good contact over the entire circumference. Moreover, there was almost no variation in the thickness of the reinforced resin layer 8.

[Composition of curable resin composition] Unsaturated polyester resin (Polylite FS-130-N manufactured by Dainippon Ink and Chemicals, Inc.) ... 100 parts by weight Additive (RS-474 manufactured by Dainippon Ink and Chemicals, Inc.) ): 100 parts by weight Curing agent (methyl ethyl ketone peroxide): 0.5 parts by weight Glass chop (1150 TEX, 8 mm length): 14 parts by weight

[Physical Properties of Curable Resin Composition] Viscosity ... 20 Poise Thixotropic ... 7 (JIS K 6901)

The reinforced plastic composite pipe P for the propulsion method thus obtained was sliced into five parts as shown in FIG. 2, and then the thickness of the reinforced resin layer 8 at each part of A to H shown in FIG. And the adhesion with the FRPM tube 1 was examined,
The reinforced resin layer 8 and the FRPM tube 1 were in close contact with each other at any part. The thickness of the reinforced resin layer in each part was as shown in Table 1.

[0033]

[Table 1]

As shown in Table 1, the surface condition was very good although there were some variations in the thickness of the reinforced resin layer 8 in each part.

(Embodiment 3) The above-mentioned embodiment except that the surface of the net 6 is pressed toward the FRPM tube 1 by a pressure roller as a pressing means immediately after winding the net 6 around the surface of the curable resin composition 5. A reinforced plastic composite pipe P for the propulsion method was obtained in the same manner as in 2. The reinforced plastic composite pipe P for the propulsion method thus obtained was sliced into five parts as shown in FIG. 2, and then the thickness of the reinforced resin layer 8 and the FRPM pipe at each part of A to H shown in FIG. When the adhesion with No. 1 was examined, it was found that the reinforced resin layer 8 and the FRPM tube 1 were in close contact with each other at any part. Further, the thickness of the reinforced resin layer 8 in each part was as shown in Table 2. Further, the reinforced resin layer 8
The surface condition of was also good.

[0036]

[Table 2]

As shown in Table 2, there was almost no variation in the thickness of the reinforced resin layer 8 in each part, and the surface condition was very good.

(Embodiment 4) As a net, the lattice spacing is 10 mm.
A reinforced plastic composite pipe P for propulsion method was obtained in the same manner as in Example 2 except that the reinforced plastic composite pipe P for propulsion method obtained in this manner was used as shown in FIG. After being cut into 5 parts, the thickness of the reinforced resin layer 8 and the FRPM pipe 1 at each part of A to H shown in FIG.
The adhesion between the reinforced resin layer 8 and the FRPM tube 1 was examined.
And were in close contact with each other. The thickness of the reinforced resin layer 8 in each part was as shown in Table 3. In addition,
In the case of this example, after being once molded, the reinforcing fibers in the curable resin composition may pass through the lattice of the net and adhere to the pressure roller to cause the surface of the reinforced resin layer 8 to be fluffed.

[0039]

[Table 3]

As shown in Table 3, there were some variations in the thickness of the reinforced resin layer 8 in each part.

Comparative Example 1 An attempt was made to form the reinforced resin layer 8 on the surface of the FRPM tube 1 in the same manner as in Example 1 except that the net was not used, but during molding or after molding once, The curable resin composition sometimes dropped. Further, when the obtained reinforced plastic composite pipe P for propulsion method was sliced into slices and the state of the interface between the FRPM pipe 1 and the reinforced resin layer 8 was observed, the FRPM pipe 1 and the reinforced resin layer 8 were separated from each other in some places. .

(Comparative Example 2) An attempt was made to form the reinforced resin layer 8 on the surface of the FRPM tube 1 in the same manner as in Example 2 except that the net was not used, but during molding or after molding once, The curable resin composition sometimes dropped. Further, when the obtained reinforced plastic composite pipe P for propulsion method was sliced into slices and the state of the interface between the FRPM pipe 1 and the reinforced resin layer 8 was observed, the FRPM pipe 1 and the reinforced resin layer 8 were separated from each other in some places. .

The method for forming the reinforced resin layer according to the present invention is as follows.
It is not limited to the above embodiment. For example, in the above embodiment, the pressure roller is used as the pressing means,
Instead of the pressure roller, a rubber blade may be arranged like the thickness controlling plate material of FIG. 1 and pressed by the elastic force of the rubber blade. Further, in the above embodiment, the FRPM tube 1 is connected to the rubber rollers 31, 31, 31, 31.
Although the FRPM tube 1 is rotated in the direction of the arrow by driving, the FRPM tube 1 is rotated by fixing both ends of the FRPM tube 1 with chucks provided on the shaft along the central axis of the FRPM tube 1 and rotating the shaft. You may allow it.

[0044]

Since the method for forming the reinforcing resin layer of the present invention is configured as described above, it does not require a secondary process such as a cutting process that requires complicated steps and man-hours, and is simple. The reinforced resin layer can be easily formed on the surface of the substrate with a desired thickness by using a manufacturing facility.

Moreover, during and after molding, the curable resin composition does not drop, and a thick and uniform reinforced resin layer having no voids or pinholes is obtained without increasing the manufacturing cost. You can

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a first embodiment of a method for forming a reinforced resin layer according to the present invention.

FIG. 2 is a perspective view of the obtained reinforced plastic composite pipe for a propulsion method.

FIG. 3 is a cross-sectional view of the composite pipe of FIG. 2 cut into circles.

[Explanation of symbols]

 1 FRPM tube (base material) 2 annular spacer 5 curable resin composition 8 reinforced resin layer

Claims (3)

[Claims] 1. A method for forming a reinforced resin layer having a desired thickness around a base material, comprising supplying a curable resin composition to be the reinforced resin layer to the surface of a base material rotating about an axis. A method of forming a reinforced resin layer, comprising: a step of continuously winding a net-like material on the base material while winding the curable resin composition as the base material rotates. 2. The method for forming a reinforced resin layer according to claim 1, wherein the net-like material is wound while being pressed by the pressing member toward the base material. 3. The method for forming a reinforcing resin layer according to claim 1, wherein the curable resin composition has a viscosity of 5 to 60 poise and a thixotropy of 3 to 10.