FRP member

Abstract

To obtain an FRP member capable of improving adhesion of a coating composition to the surface side of a fiber-reinforced resin layer.SOLUTION: There is provided an FRP member having a fiber-reinforced resin layer, a coating layer positioned on the surface side of the fiber-reinforced resin layer and a blasting layer positioned on the surface side of the coating layer. There is provided an FRP member having a fiber-reinforced resin layer and a coating layer positioned on the surface side of the fiber-reinforced resin layer, wherein the centerline average roughness Ra1 on the outer peripheral surface of the fiber-reinforced resin layer is larger than the centerline average roughness Ra2 on the outer peripheral surface of the coating layer.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to FRP members.

Background Art

[0002] Patent Document 1 discloses a technique of laminating a plurality of coating layers when forming a coating layer for improving the design on the surface of the main body of sports equipment or the like. Further, in order to improve the adhesion between the coating layers, a polishing treatment expecting an anchoring effect or the like is mentioned, but in the case of a coating layer having insufficient adhesion between the coating layers or containing a brightening material or the like, it is mentioned as a problem that the brightening material inhibits the adhesion between the coating layers. Patent Document 1 discloses a paint for preventing peeling or the like between coating layers when a plurality of coating films are laminated by adding an adhesion-imparting material to the paint.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, for example, from the viewpoint of improving the adhesion of the paint when the coating layer is positioned on the surface side of the fiber reinforced resin layer, the conventional technology is still insufficient and there is room for improvement.

[0005] The present invention has been made based on the above problems, and an object thereof is to obtain an FRP member capable of improving the adhesion of the paint to the surface side of the fiber reinforced resin layer.

Means for Solving the Problems

[0006] The FRP member of this embodiment has a fiber-reinforced resin layer, a coating layer located on the surface side of the fiber-reinforced resin layer, and a blasting treatment layer located on the surface side of the coating layer. A plurality of the coating layers are provided, and a plurality of the blasting treatment layers are provided on the surface side of the plurality of coating layers. and a belt polishing layer is located on the surface side of the fiber reinforced resin layer, and the center line average roughness Ra1 of the outer peripheral surface of the fiber reinforced resin layer is larger than the center line average roughness Ra2 of the outer peripheral surface of the coating layer It is characterized by this.

[0008] The fiber-reinforced resin layer may be cylindrical, the coating layer may be cylindrical, and the blasting treatment layer may be cylindrical.

[0009] The blasting treatment layer may be a water blasting treatment layer.

Advantages of the Invention

[0013] According to this embodiment, an FRP member capable of improving the adhesion of the paint to the surface side of the fiber-reinforced resin layer can be obtained.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0015] FIG. 1 is a view showing an example of a golf club shaft 10 and an example of a golf club 20 to which the FRP member according to the present embodiment is applied. By attaching a head 30 to the tip side (chip side) of the golf club shaft 10 and attaching a grip 40 to the base end side (butt side) of the golf club shaft 10, the golf club 20 is completed. In FIG. 1, an iron club using an iron head as the head 30 is illustrated, but the present embodiment is also applicable to a driver club using a driver head as the head 30 and a putter club using a putter head as the head 30.

[0016] The golf club shaft 10 is, for example, a golf club shaft made of FRP (Fiber Reinforced Plastics) obtained by winding a plurality of layers of prepreg in which a thermosetting resin is impregnated into reinforcing fibers and then thermosetting. As the prepreg, for example, a prepreg in which the fiber directions are aligned in a predetermined direction can be used. Further, as the prepreg, an angle layer may be provided in accordance with strength and rigidity, or metal, resin, or the like may be provided between the prepregs or in the innermost layer. For example, the golf club shaft 10 may be FRP laminated with at least two or more layers, and the outermost layer may be FRP. Here, the “outermost layer” means the outermost layer of the golf club shaft 10 before performing the undercoat (undercoating), topcoat (topcoating), water blast treatment, and final coating described later. Note that the number, type, and number of windings (ply number) of the prepreg to be used have degrees of freedom, and various design changes are possible. That is, the configuration of the golf club shaft 10 before performing the undercoat (undercoating), topcoat (topcoating), water blast treatment, and final coating described later is not limited (and can be appropriately selected by those skilled in the art).

[0017] The golf club shaft 10 has a tapered shape that gradually decreases in diameter from the base end side (butt side) toward the tip side (chip side) (in FIG. 1, the tapered shape of the golf club shaft 10 is exaggerated).

[0018] In this embodiment, after applying a primer (undercoat) to the outer peripheral surface of the golf club shaft 10, a water blast treatment is performed, and then a topcoat (topcoat) is applied. The topcoat (topcoat) is usually applied in multiple times. In that case, a water blast treatment is performed after the first application of the topcoat (topcoat), and the process of performing a water blast treatment after the second application of the topcoat (topcoat) is repeated. Note that before applying a primer (undercoat) to the outer peripheral surface of the golf club shaft 10, a commonly known polishing treatment may be performed. For example, a belt polishing layer may be located on the surface (side) of the fiber reinforced resin layer of the golf club shaft 10.

[0019] The golf club shaft 10 becomes a finished product by finally performing painting after repeating the above-described primer (undercoat), topcoat (topcoat), and water blast treatment. However, the golf club shaft (FRP member) 10 in this specification is premised on the state where the final painting has not been performed. One of the purposes of the golf club shaft (FRP member) 10 of this embodiment is to prevent painting defects (enhance the adhesion of the paint). Here, the painting (paint) mentioned does not mean the final painting, but means the primer (undercoat) and topcoat (topcoat) applied with the intervention of the water blast treatment. Also, the water blast treatment may not be performed on the paint layer (the outermost paint layer) immediately before the final painting.

[0020] FIG. 2 is a cross-sectional view schematically showing the structure of the golf club shaft (FRP member) 10. The golf club shaft 10 includes a fiber reinforced resin layer 100 that constitutes the outermost layer of the golf club shaft 10, a paint layer (for example, an undercoat layer) 200 located on the surface (side) of the fiber reinforced resin layer 100, a blast treatment layer 300 located on the surface (side) of the paint layer 200, a paint layer (for example, a topcoat layer) 400 located on the surface (side) of the blast treatment layer 300, and a blast treatment layer 500 located on the surface (side) of the paint layer 400.

[0021] In FIG. 2, the fiber reinforced resin layer 100, the coating layer 200, the blasting treatment layer 300, the coating layer 400, and the blasting treatment layer 500 are depicted in a planar shape. However, when the golf club shaft 10 is made of an FRP member, the fiber reinforced resin layer 100, the coating layer 200, the blasting treatment layer 300, the coating layer 400, and the blasting treatment layer 500 are configured in a cylindrical shape. Note that when the FRP member is applied to a non-cylindrical member, the fiber reinforced resin layer, the coating layer, and the blasting treatment layer do not have to be cylindrical.

[0022] In FIG. 2, two coating layers 200 and 400 are depicted as multiple coating layers, and two blasting treatment layers 300 and 500 are depicted as multiple blasting treatment layers provided on the surfaces (sides) of the two coating layers 200 and 400. However, three or more coating layers may be provided as multiple coating layers, and three or more blasting treatment layers may be provided as multiple blasting treatment layers provided on the surfaces (sides) of the three or more coating layers. That is, multiple coating layers may be provided, and multiple blasting treatment layers may be provided on the surface side of the multiple coating layers.

[0023] Here, the blasting treatment layer is a treatment layer applied to the surface of the coating layer and constitutes a part of the coating layer (not a treatment layer separate from the coating layer). Also, in the coating layer depicted as a single layer in FIG. 2, multiple coating layers may be laminated.

[0024] In this embodiment, for the coating layers 200 and 400 located on the surface (side) of the fiber reinforced resin layer 100, by providing a blasting treatment layer 300 obtained by applying a blasting treatment to the surface of the coating layer 200 and a blasting treatment layer 500 obtained by applying a blasting treatment to the surface of the coating layer 400, the adhesion of the paint to the surface (side) of the fiber reinforced resin layer 100 has been successfully improved. More specifically, the blasting treatment layer 300 and the blasting treatment layer 500 are preferably water blasting treatment layers formed by performing a water blasting treatment. The water blasting treatment may be read as a wet blasting treatment.

[0025] Water blast treatment is a surface treatment method that uses three elements: particles, liquid, and air. The particles serve as abrasives that scrape, strike, and grind the surface to be treated, and can be selected from types such as ceramics, resins, and metals. The liquid functions to deliver the particles to the surface to be treated, provide a cooling function, remove deposits and chips, and is for exerting a water film effect. The air functions to accelerate the particles and the liquid and to atomize the liquid. Water blast treatment has features (technical advantages) such as a wide selection range of, for example, the size, shape, and material of the particles, high controllability of fluid control, and few particle residues.

[0026] According to the water blast treatment, the projected abrasive scrapes off a single thin layer of the surface to be treated together with foreign substances at the sub-micron level, and at the same time, water flushes the surface to be treated, so that regardless of the material of the adhered particles, the particle residues are reduced, and compared with the commonly known polishing treatment etc., the removal (cleaning) treatment can be simplified. Furthermore, due to the surface roughening effect of creating a uniform and fine unevenness on the surface to be treated to produce a satin finish (a state like the surface of frosted glass), the adhesion of the surface to be treated can be improved (the adhesion of the paint can be improved).

[0027] In this embodiment, the center line average roughness Ra1 of the outer peripheral surface of the fiber reinforced resin layer 100 is larger than the center line average roughness Ra2 of the outer peripheral surface of the coating layer 200 (the coating layer 200 provided with the blast treatment layer 300) and / or the coating layer 400 (the coating layer 400 provided with the blast treatment layer 500). Also, when a polishing treatment (for example, belt polishing treatment) is performed on the outer peripheral surface of the fiber reinforced resin layer 100, it may be based on the center line average roughness Ra1 of the outer peripheral surface of the fiber reinforced resin layer 100 subjected to the polishing treatment. Thus, by optimally setting the center line average roughnesses Ra1 and Ra2, the adhesion of the paint to the surface (side) of the fiber reinforced resin layer 100 can be further improved.

[0028] Although the size of the center line average roughness Ra2 is not specifically limited, for example, it is preferably 0.2 μm or more and 4.0 μm or less. The upper limit value of the center line average roughness Ra2 is more preferably 3.5 μm or less, still more preferably 3.0 μm or less, even more preferably 2.0 μm or less, and most preferably 1.0 μm or less.

[0029] The condition is that the center line average roughness Ra1 is larger than the center line average roughness Ra2. When the outer peripheral surface of the fiber-reinforced resin layer 100 is not surface-treated, it is defined by the center line average roughness of the surface itself of the fiber-reinforced resin layer 100. Further, when the outer peripheral surface of the fiber-reinforced resin layer 100 is subjected to belt polishing treatment, it is defined by the center line average roughness of the belt polishing treatment layer. Although the size of the center line average roughness Ra2 is not specifically limited, for example, it is 0.5 μm or more and 15.0 μm or less.

[0030] In the above embodiments, the case where the golf club shaft 10 is applied as the FRP member has been exemplified and described. However, it is also possible to apply other members such as fishing rods as the FRP member. Further, the FRP member does not necessarily have to be cylindrical. That is, the application target of the FRP member is not limited to the golf club shaft, and the FRP member of the present embodiment can be applied to all current and future types of FRP members. Furthermore, when the FRP member is a cylindrical member, an annular cylindrical member, among which, a cylindrical member having a constant diameter in the axial direction, or a cylindrical member having a tapered shape that tapers and expands in the axial direction may be applied.

[0031] In the above embodiments, the water blast treatment (layer) has been exemplified and described as the blast treatment (layer). However, it is also possible to apply a blast treatment (layer) other than the water blast treatment (layer). For example, it is also possible to apply a dry blast treatment (layer) that does not use water. That is, as the blast treatment (layer), it is applicable to all blast treatments in which particles (abrasives, polishing powders) are sprayed to roughen the surface of the workpiece.

Examples

[0032] Hereinafter, the effects of the present invention will be described with reference to Examples and Comparative Examples of the present invention. Note that the present invention is not limited in any way by the following examples.

[0033] <Experiment - 1> The following treatments were performed on the surface of the coating layer formed on the outer peripheral surface of the fiber - reinforced resin layer. (1) Example of performing water - blasting treatment (2) Example of performing belt - grinding treatment (3) Example of performing belt - grinding treatment (low) (3) was carried out under conditions where it could not be polished sufficiently as compared with (2). Figures 3 to 5 are graphs showing the measurement results of roughness curves by (1) to (3). Note that the roughness curves shown in Figures 3 to 5 were obtained using a VR - 5000 manufactured by Keyence. As shown in Figures 3 to 5, the surface roughness by water - blasting treatment could be made smaller than the surface roughness by belt - grinding treatment. The measurement results of the center - line average roughness (Ra), maximum height (Rz), and ten - point average roughness (RzJIS) in each example are shown in Tables 1 to 3 below.

[0034]

Table 1

[0035]

Table 2

[0036]

Table 3

[0037] Table 1 shows the measurement results by water blast treatment, Table 2 shows the measurement results by belt grinding treatment, and Table 3 shows the measurement results by belt grinding treatment (low). As shown in Table 1, for the center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS), the measurement results after water blast treatment were the smallest in all cases. The center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS) were measured by a method conforming to JIS B0601.

[0038] <Experiment - 2> Next, in the same manner as <Experiment - 1> above, each of the surface treatments (1) to (3) was performed on the surface of the coating layer formed on the outer peripheral surface of the fiber reinforced resin layer. However, the measurement positions were changed to 100 mm, 400 mm, and 800 mm from the reference position (0 mm), and the measurement angles were changed to 0°, 90°, 180°, and 270°. Then, the center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS) were measured. The measurement angle is the angle of 360° around the surface of the cylindrical coating layer. The following shows each measurement result.

[0039]

Table 4

[0040]

Table 5

[0041]

Table 6

[0042] Table 4 shows the measurement results by water blast treatment, Table 5 shows the measurement results by belt grinding treatment, and Table 6 shows the measurement results by belt grinding treatment (low). As shown in Tables 4 to 6, when comparing at the same measurement position and measurement angle, for the experimental examples by water blast treatment, the center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS) were approximately smaller than those of the experimental examples by belt grinding treatment.

[0043] Also, considering the standard deviations of the center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS), the standard deviations of the experimental examples by water blast treatment were all smaller than those of the experimental examples by belt grinding treatment. Combining Table 1 and Table 4, it was found that in the experimental examples by water blast treatment, the standard deviation of the center line average roughness (Ra) can be made about 0.1 μm to 0.5 μm, the standard deviation of the maximum height (Rz) can be made about 1.5 μm to 3.5 μm, and the standard deviation of the ten-point average roughness (RzJIS) can be made about 0.5 μm to 2.0 μm. Thus, it was found that by performing water blast treatment, the variation in surface roughness can be reduced. From the above, it was found that by performing water blast treatment, the center line average roughness (Ra), maximum height (Rz), and ten-point average roughness (RzJIS) can be stably reduced.

[0044] All the measurement results of the above water blast treatment correspond to the examples, and all the measurement results of the belt grinding treatment correspond to the comparative examples.

[0045] <Experiment - 3> Next, the surface roughnesses at three locations, namely the tip, middle, and grip end of the golf club shaft, were measured. The tip of the golf club shaft refers to the vicinity of the head 30 shown in FIG. 1, the grip end of the golf club shaft refers to the vicinity of the grip 40 shown in FIG. 1, and the middle of the golf club shaft refers to the position between the tip and the grip end of the golf club shaft.

[0046] In the experiment, water blast treatment was performed on the surface of the coating layer formed on the outer peripheral surface of the fiber-reinforced resin layer, and the surface roughness of the coating layer was measured. The measurement results are shown in Table 7 below.

[0047]

Table 7

[0048] Furthermore, in the experiment, belt grinding was performed on the outer peripheral surface of the fiber-reinforced resin layer before forming the coating layer, and the surface roughness of the outer peripheral surface of the fiber-reinforced resin layer was measured. The measurement results are shown in Table 8 below.

[0049]

Table 8

[0050] The Ra shown in Table 7 corresponds to the "center line average roughness Ra2 of the outer peripheral surface of the coating layer", and the Ra shown in Table 8 corresponds to the "center line average roughness Ra1 of the outer peripheral surface of the fiber-reinforced resin layer". As shown in Tables 7 and 8, it was found that Ra1 > Ra2 in any of the tip portion, the middle portion, and the hand portion. Also, the same results were obtained for the maximum height (Rz) and the ten-point average roughness (RzJIS). Further, the average interval of unevenness (Sm) was larger on the surface of the coating layer subjected to water blasting treatment than on the outer peripheral surface of the fiber-reinforced resin layer in any of the tip portion, the middle portion, and the hand portion. Thus, it was found that the unevenness becomes small and the surface becomes smooth by performing the water blasting treatment.

[0051] Furthermore, it was found from Tables 7 and 8 that the variation in Ra from the tip portion to the hand portion is smaller on the surface of the coating layer subjected to water blasting treatment than on the outer peripheral surface of the fiber-reinforced resin layer. It was found that the variation in Ra from the tip portion to the hand portion can be reduced to about 0.01 μm to 0.2 μm on the surface of the coating layer subjected to water blasting treatment. Also, it was found that the variation in Rz from the tip portion to the hand portion can be reduced to about 0.05 μm to 0.2 μm on the surface of the coating layer subjected to water blasting treatment. Also, it was found that the variation in RzJIS from the tip portion to the hand portion can be reduced to about 0.05 μm to 0.2 μm on the surface of the coating layer subjected to water blasting treatment. Note that the variation in Ra from the tip portion to the hand portion is smaller on the surface of the coating layer subjected to water blasting treatment than in the example where belt grinding was performed on the coating layer surface.

[0052] <Experiment-4> Next, as an example, topcoating was applied to the surface of the coating layer that had been subjected to water blasting treatment. In this example, the relationship of Ra1 > Ra2 shown in the above Experiment - 3 was satisfied. Also, as a comparative example, topcoating was applied without subjecting the surface of the coating layer to water blasting treatment.

[0053] In the experiment, cellophane tape was attached to and then peeled off from the film surfaces of the example and the comparative example, and the peeled cellophane tape was pasted onto the mount board. The photograph thereof is shown in FIG. 6, and a partial schematic diagram of FIG. 6 is shown in FIG. 7. The cellophane tape from the comparative example was pasted onto the left mount board shown in FIGS. 6 and 7, and the cellophane tape from the example was pasted onto the right mount board shown in FIGS. 6 and 7. As shown in FIGS. 6 and 7, in the comparative example, a part of the coating adhered to the cellophane tape, indicating poor adhesion. In contrast, in the example, it was found that the coating did not adhere to the cellophane tape and good adhesion was maintained.

[0054] <Summary> From the above experiment, it was found that by subjecting the coating layer to water blasting treatment, the adhesion of the paint can be improved. Also, in the relationship between the center line average roughness Ra1 of the outer peripheral surface of the fiber - reinforced resin layer and the center line average roughness Ra2 of the outer peripheral surface of the coating layer, it was found that Ra1 > Ra2 is preferable for adhesion. Furthermore, although the magnitude of the center line average roughness Ra2 is not specifically limited, from the above experimental results, it was found that it is preferably 0.2 μm or more and 4.0 μm or less.

Explanation of Reference Numerals

[0055] 10 Golf club shaft (FRP member) 20 Golf club 30 Head 40 Grip 100 Fiber - reinforced resin layer 200 Coating layer 300 Blasting treatment layer 400 Coating layer 500 Blasting treatment layer

Claims

1. A fiber-reinforced resin layer, a coating layer located on the surface side of the fiber-reinforced resin layer, a blasting treatment layer located on the surface side of the coating layer, and having, wherein a plurality of the coating layers are provided, wherein a plurality of the blasting treatment layers are provided on the surface side of the plurality of coating layers, a belt polishing layer is located on the surface side of the fiber-reinforced resin layer, and the center line average roughness Ra1 of the outer peripheral surface of the fiber-reinforced resin layer is larger than the center line average roughness Ra2 of the outer peripheral surface of the coating layer, and an FRP member characterized by this.

2. The fiber-reinforced resin layer is cylindrical, the coating layer is cylindrical, the blasting treatment layer is cylindrical, and an FRP member according to Claim 1, characterized by this.

3. The blasting treatment layer is a water blasting treatment layer, and an FRP member according to Claim 1 or Claim 2, characterized by this.

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