JP2596135Y2 - Laminate - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate formed by winding a prepreg impregnated with a thermosetting resin on high-strength fibers aligned in one direction, and curing by heat treatment. Therefore, it can be used for a rod tube of a fishing rod, a shaft of a golf club, and the like.

[0002]

2. Description of the Related Art Fishing rods are required to be lightened in order to hold them for a long time and to improve their operability, and are also required to have increased strength in order to receive a large bending force due to strong pulling by fish. Also, golf clubs are light and
High strength properties are required. Thus, fishing rods, shafts of golf clubs, and the like are required to have conflicting performances of light weight and high strength. For this reason, conventionally, a high-strength, lightweight fiber such as carbon fiber is used, a prepreg impregnated with a synthetic resin such as an epoxy resin is formed, and the prepreg is wound and heat-treated to reduce the weight and weight. A high-strength laminated tube is formed.

In this case, the weight percentage of the resin in the prepreg is generally 35% to 40%.
-44492. Further, the invention according to this publication stipulates the relationship between the resin impregnation amount of the innermost layer of the rod tube and the resin impregnation amount of its outer layer from the viewpoint of conformability to the core metal and adhesion of each layer, The innermost layer is 50
% And the outer layer is 33% or less.

[0004]

However, it has been observed by the present applicant that the amount of resin disclosed in the above-mentioned publication is too large for the fibers and that a resin layer and a resin pool are formed. The strength and elastic modulus were measured by experiments, but were not sufficient.

Accordingly, an object of the present invention is to provide a high-strength laminate formed by prepreg in which high-strength fibers are impregnated with a thermosetting resin.

[0006]

The present invention in view, there is provided a means for solving above object, a thermosetting resin as a matrix, a layer reinforced with high strength fibers to a laminate having a body layer, said body
The layer mainly uses carbon fiber as a high-strength fiber, and is mainly aligned in one direction, and the weight percentage of the resin to the total weight of the fiber and the resin is approximately 10% to 20%.
, And the to the body layer, a carbon fiber gills primarily引揃in one direction, the volume percentage of the total volume of the fibers and the resin
Together are provided with a layer of density greater than 75% the 75
% Is provided with a resin in a state where voids are hardly observed in a layer having a density exceeding%. The layer in the main body layer is the main body layer itself when the main body layer is a single layer aligned in one direction.
In the case where a thin layer oriented in the orthogonal direction is interposed therebetween as described in 1, the fibers divided in the thin layer are aligned in one direction which is the main direction of the main body layer. One of the layers.

[0007]

Since the layer having a resin weight percentage of about 10% to 20% is used as the main layer, the resin ratio is small, so that the resin layer and the resin pool hardly occur, and the volume percentage of the fibers in the main layer is small. a density exceeding 75%, mainly comprises a layer of引揃the obtained carbon fiber in one direction, the resin in the state where voids hardly seen the layer of density exceeding the 75% is filled In addition, the strength is improved while the resin ratio of the laminate is reduced qualitatively. Therefore, if the strength is made equal to that of the conventional laminate having a large resin ratio, the thickness and weight can be reduced. Also, the flexural modulus is improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings. FIG. 1 is a partial cross-sectional view of a tube-shaped laminate according to the present invention, that is, a laminated tube 10. Referring to FIG. 2, the laminated tube 10 is wound around a prepreg obtained by impregnating a bundle of carbon fibers 18 aligned in one direction with an epoxy resin 20 so that the carbon fibers 18 face the longitudinal direction of the laminated tube 10. And has a main body layer 12 which is heat-treated. The carbon fiber 18 is an example of a high-strength fiber, and may be a glass fiber, a boron fiber, or the like. Also,
The epoxy resin 20 is an example of a thermosetting resin, and may be a polyester resin, a phenol resin, or the like. These are the same in the following.

On the inside and outside of the main body layer 12, a reinforcing layer 14 and a reinforcing layer 16, which are thinner than the main body layer 12, are formed, respectively. Each of the reinforcing layers 14 and 16 is formed by winding a prepreg obtained by impregnating a carbon fiber bundle aligned in one direction with an epoxy resin so that the fiber direction thereof is oriented in the circumferential direction of the laminated tube 10. Then, the laminate is heat-treated and cured to form the laminated tube 10.

Although the details of the method of manufacturing the layers 12, 14, 16 will be described later, the weight ratio of the resin 20 to the total weight of the main body layer 12 is 20%, and the reinforcing layers 14, 16 in the prepreg stage. The weight ratio of the amount of each impregnated resin to each weight is 35%. As will be described later with reference to FIG. 5, the weight ratio of the resin 20 in the main body layer 12 is not limited to 20% and may be in a range of about 10% to 20%. The weight ratio in the original prepreg step of forming the outer reinforcing layer 16 is 35% because after the prepreg is wound, a tightening force is directly applied by a tightening tape to forcibly remove a part of the impregnated resin. This is because it is necessary to increase the size of the main body layer 12 by about 15% in order to allow the air to flow out to the outside and to simultaneously discharge the air pool. Further, in the case of the inner reinforcing layer 14, this is from the viewpoint of improving conformability to the core metal at the time of winding.

According to a micrograph taken along the line AA of the laminated tube 10 produced as a result, there is a certain rule in the state of aggregation of the carbon fibers 18 in each layer, and the type TA which is aggregated in a dense triangular shape, Type TB assembled in a dense square shape,
It is formed in combination with the type TC assembled in a rough square shape.

[0012] Of the type TA, the set of fibers 18 having the least amount of resin 20 is in the state shown in FIG.
FIG. 4B shows the state shown in FIG. In the type TC, the fibers 18 are separated to some extent, but the separation distance is equal to or less than the diameter of the fibers 18. As a result of assembling the three types of fiber assembly types TA, TB, and TC, the laminated pipe 1
In each of the layers and layers of No. 0, almost no layered portions of resin alone or resin pools without fibers were observed.

Therefore, it can be said that the strength is strong. FIG. 5 is a graph showing the results of this experiment. The numerical value in the upper part of the horizontal axis is the volume percentage of the fiber, the numerical value in the lower part represents the weight percentage of the resin amount, the left vertical axis S is the bending strength of the test piece (kgw / mm ² ), and the right vertical axis E is It represents the flexural modulus (× 10 ³ kgw / mm ² ) of the test piece. Under the following conditions, the test piece was prepared by aligning and orienting the fibers in one direction in the same manner as in the main body layer 12 of the above-described embodiment, and orienting the fibers to a thickness of 2 mm. Carbon fiber tensile strength ···· 400kgw / mm ² tensile modulus ^{··· 60 × 10 3 kgw / mm} 2 Density ......... 1.94 g / cm ³ Epoxy resin density ....... 1.20 g / cm ³

The circles indicate the experimental values of the bending strength S of the test pieces, and the triangle marks indicate the experimental values of the flexural modulus E of the test pieces. The experiments showed that the resin weight percentage was 28.5%, 26.1%, 1%.
9.2%, 17.0%, 13.2%, and 9.4% are performed. Curve LS is a bending strength curve obtained from each of the above bending strength experimental values, and straight line LE is each of the above bending elastic moduli. It is a bending elastic modulus line obtained from the experimental value. Dotted lines indicate unconfirmed areas.

From these results, it can be seen that the flexural modulus E increases as the weight percentage of the resin amount decreases, and the bending strength S has the largest value in the region where the weight percentage of the resin amount is about 10% to 20%. It turns out that it shows.

When the cross section of the test piece corresponding to the weight percentage of each resin amount was observed with a micrograph, it was 28.5% and 2%.
In the case of 6.1%, the above fiber assembly types TA, TB,
In addition to TC, many resin pools are seen, but 19.2%,
In the case of 17.0%, 13.2%, and 9.4%, resin pools are hardly observed. Further, it is observed that as the weight percentage of the resin amount decreases, the number of the type TB becomes larger than that of the type TC, and further, the type TA becomes larger than the type TB.

The density of the epoxy resin is 1.20.
g / cm ^3, the density of the carbon fibers to 1.94 g / cm ^3, the theoretical weight percentage of the resin amount in the case the fiber aggregate type shown in FIG. 3 is a TA of about 6.0%, fiber assembly shown in FIG. 4 When the type is TB, it is about 14.5%, and when the fiber assembly type is TC, it is not determined. Even in the case of type TA, it is general that the fibers 18 face each other with a thin layer of the resin 20 interposed therebetween. In this case, the weight percentage is larger than 6.0%, and 14.
It is larger than 5%. Also, since the cross-sectional shape of the fiber is not necessarily circular, the weight percentage of the fiber amount is in the range of 10% to 20% described above and the strength is the strongest if the aggregation state of the fiber is in any state by only such calculation. I can't say for sure, but when combined with observations, type TA
It can be said that it is desirable to form by mixing of type TB and type TB (type TC is included in one type of type TB).

In the following, points to be noted with respect to the method of manufacturing the laminated tube 10 shown in FIG. 1 and the laminated body in the case where the main body layer 12 is formed in multiple layers will be described. At the time of forming the prepreg of each layer, the epoxy resin is impregnated from one end in the longitudinal direction of the carbon fibers 18 aligned in one direction, or impregnated from either one of the front side and the back side of the fiber bundle sheet. In the former case, the bubbles are extruded from the other end in the length direction of the fiber, so that the bubbles are less likely to remain than in the case of impregnating from both ends of the fiber. Further, in the latter case, bubbles are less likely to remain as in the former case than in the case of impregnation from both sides, and work efficiency is improved as compared with the former method. In both the former and the latter, the amount of the resin can be reduced by the amount that the resin used for the operation of pushing out the bubbles becomes unnecessary.

Before laminating and pressurizing and heat curing, pressurizing,
Close contact is made so that air bubbles are not retained between the layers.

When forming a laminated tube by applying pressure while heating, it is formed while suppressing the flow of the resin. That is, it is possible to prevent the resin from flowing from the inner layer to the surface layer as in the related art. This is because, when this flow is present, the fibers move together with the flow of the resin, which causes a dense portion of the fibers and a layer or resin pool of the resin alone. In addition, it is preferable to preheat at the softening temperature of the resin which is equal to or lower than the curing temperature without suddenly raising the temperature to the curing temperature, and to maintain the temperature at this temperature to allow the whole to be blended. Furthermore, since the amount of resin is small, it is preferable to improve the adhesiveness between fibers by increasing the pressing force as compared with the conventional case where the resin amount ratio is large.

In the above embodiment, the main body layer 12 is a single layer in which the fibers are aligned in one direction, but a layer in which the fibers are aligned in the longitudinal direction of the laminated tube 10 and a thin layer in which the fibers are aligned in the direction perpendicular thereto. May be alternately arranged and laminated to form the main body layer 12. Also in this case, the weight percentage of the resin amount of the main body layer 12 is set to about 10% to 20%. As described above, the outermost layer and the innermost reinforcing layer involve resin flow to the outside due to conformability with the core metal and direct compression with the fastening tape,
It is preferable that the amount of the resin to be impregnated is 15% or more larger than that of the main body layer 12.

Since the main layer 12 of the laminated tube 10 of the embodiment of FIG. 1 according to the present invention does not necessarily have a sufficient impact strength, it is located outside the outermost reinforcing layer 16 or the main layer. A layer of a thermoplastic resin having good vibration absorption may be formed directly outside of the layer 12. As an example of this resin layer,
When the polyamide fiber is wound on the layer in which the above-described prepreg is wound, and the above-described heat treatment for curing is performed in this state, the wound polyamide fiber is softened and formed into a layer depending on the temperature. . This softening may be incomplete.

[0023]

[Effects of the Invention] As is apparent from the above description, according to the present invention, the amount of resin relative to the amount of fiber is appropriately adjusted, so that in addition to a resin-only layer and a resin pool, almost no voids are generated, and It is possible to prevent the stress at the time of being partially concentrated and breaking therefrom, and it is possible to provide a laminate having high strength and high elasticity.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a laminated tube as an example of a laminated body according to the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1;

FIG. 3 is an explanatory diagram of a fiber assembly type TA shown in FIG. 2;

FIG. 4 is an explanatory diagram of the fiber assembly type TB shown in FIG.

FIG. 5 is an explanatory diagram of a strength test result of the laminate according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 laminated pipe 12 main body layer 14, 16 reinforcing layer 18 carbon fiber 20 epoxy resin E flexural modulus S flexural strength

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tomoyoshi Tsuruto 3-14-16 Maezawa, Higashikurume-shi, Tokyo Daiwa Seiko Co., Ltd. (56) References JP 1-279932 (JP, A) Hei 2-44492 (JP, B2) Practical application Microfilm (JP, U) photographing the specifications and drawings attached to the application of Japanese Patent Application No. 60-97049 (Japanese Utility Model Application Publication No. 62-5907).

Claims (1)

(57) [Scope of request for utility model registration] 1. A laminate comprising, as a main layer, a layer made of a thermosetting resin as a matrix and reinforced with high-strength fibers, wherein the main layer mainly uses carbon fibers as high-strength fibers, and is mainly unidirectional. And the weight percentage of the resin to the total weight of the fiber and the resin is approximately 10%.
From a 20%, to the body layer, a carbon fiber gills primarily引揃in one direction, the volume percentage of the total volume of the fibers and the resin are provided with a layer of density greater than 75% the 75 %, Wherein the resin is filled in a layer having a density exceeding% in such a manner that almost no voids are observed.