JPH06200053A - Prepreg and fiber-reinforced plastic - Google Patents

Abstract

(57) [Summary] [Object] To provide a fiber reinforced plastic having a desired coloring and a prepreg for producing the same. [Constitution] (i) a concealing layer containing a reinforcing fiber, a matrix resin, and a concealing material, (ii) a separating layer laminated on the concealing layer, and (iii) provided on the separating layer and transparent. Provided is a prepreg having a colored layer containing various reinforcing fibers, a matrix resin, and a coloring material. In addition, the present invention, (i) a reinforcing fiber, a hardened matrix resin, a hiding layer containing a hiding material, (ii) an isolation layer laminated on the hiding layer, (ii
i) A fiber-reinforced plastic having a colored layer provided on the isolation layer, the transparent reinforcing fiber, a cured matrix resin, and a coloring material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prepreg for producing a fiber reinforced plastic, and more particularly to a prepreg for producing a fiber reinforced plastic having an arbitrary color and a fiber reinforced plastic.

[0002]

2. Description of the Related Art Conventionally, lightweight fiber reinforced plastics (hereinafter sometimes referred to as "FRP") having high mechanical strength have been used for golf club shafts, ski poles, fishing rods, rackets for tennis and badminton, etc. ing. Conventional FRP products are often uncolored, that is, products that utilize the color of the reinforcing fibers as they are. However, it is often the case that it is desired to color the product in a color other than the color of the reinforcing fibers. For this purpose, the finished FRP products are usually painted and colored. However, what is colored by painting,
It has the drawback that the color easily peels off. In order to overcome this drawback, it has been proposed to include a masking material for masking the color of the reinforcing fibers and a coloring agent for performing desired coloring in the matrix resin. For example, JP-A-3-119038 discloses a colored prepreg in which a flaky colorant and a masking pigment are contained in a matrix resin. JP-A-3-139531 discloses a colored prepreg sheet in which one surface of a reinforcing fiber sheet is impregnated with a matrix resin containing a concealing pigment and the other surface is impregnated with a matrix resin containing a flaky coloring material. .

However, in the conventional technique in which the hiding material and the coloring material are contained in the same matrix resin, the hiding material and the coloring material are mixed with each other, and when such a mixed color is desired (of the marble To show like)
Is good, but otherwise the desired color cannot be applied. Also in the method described in JP-A-3-13953, the hiding material and the coloring material are mixed at the interface between the layer of the matrix resin containing the hiding material and the layer of the matrix resin containing the coloring material. The problem arises.

[0004]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a fiber reinforced plastic having a desired color and a prepreg for producing the same.

As a result of earnest research, the inventors of the present application have developed a technique for preventing a hiding material and a coloring material from being mixed with each other, thereby obtaining a fiber reinforced plastic having a desired coloring, and completed the present invention. .

That is, the present invention provides (i) a concealment layer containing reinforcing fibers, a matrix resin and a concealment material, (ii) an isolation layer laminated on the concealment layer, and (iii) the isolation layer. Provided is a prepreg having a colored layer provided on the reinforcing layer, a matrix resin, and a coloring material. Further, the present invention, (i) a reinforcing fiber, a cured matrix resin,
A hiding layer containing a hiding material, (ii) an isolation layer laminated on the hiding layer, (iii) a transparent reinforcing fiber provided on the isolation layer, a cured matrix resin, and a coloring material Provided is a fiber-reinforced plastic having a colored layer containing and.

The present invention will be described in more detail below.

The hiding layer constituting the prepreg of the present invention is
As described above, the reinforcing fiber, the matrix resin, and the hiding material are included. As the reinforcing fiber, any of those conventionally used for prepregs can be used.
For example, as inorganic fibers, glass fibers, carbon fibers, graphite fibers, alumina fibers, boron fibers, titania fibers, silicon carbide fibers, etc .; various natural fibers; as organic synthetic fibers, cellulose derivative fibers, aramid fibers,
Polyester fiber, polyamide fiber, acrylic fiber, polyethylene fiber, polypropylene fiber and the like; metal fiber such as steel fiber, stainless fiber, tungsten fiber and the like; metal coated inorganic fiber, organic fiber; ceramic coated fiber and the like can be used. Multiple types of fibers can also be used. The fiber diameter of the reinforcing fiber is not limited at all, and one having an arbitrary thickness can be selected according to the application. Further, the reinforced fiber may have any desired form, such as one in which fibers are aligned in one direction, or a non-woven fabric.

The matrix resin in the concealing layer is not limited at all, and any of those conventionally used for prepregs can be adopted. For example, epoxy resin, phenol resin, alkyd resin, urea-
Formaldehyde resin, unsaturated polyester resin, aromatic polyamide resin, polyimide resin, polyamide-imide resin, polyester-imide resin, polybenzothiazole resin, silicon resin and other thermosetting resins (having fluidity before curing); Polyethylene, polypropylene, acrylic resin, styrene resin, polyvinyl chloride, ABS
Resin, styrene-acrylonitrile copolymer, polyamide, polyacetal, polysulfone, polycarbonate, polyphenylene oxide, polyether sulfone,
Thermoplastic resins such as polyether ether ketone; polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer, acrylonitrile-butadiene copolymer, synthetic rubbers such as silicone rubber and natural rubbers can be adopted. . A plurality of resins may be mixed and used.

The hiding material in the hiding layer is for hiding the color of the reinforcing fibers in the reinforcing fiber resin layer and / or the reinforcing fibers in the hiding layer under the hiding layer, that is, for hiding from the outside. However, any pigment that can achieve this purpose can be used. Examples include titanium dioxide, zinc sulfide, zinc white, lithopone, antimony oxide,
Inorganic white pigments such as lead hydroxycarbonate, lead oxysulfate, alumina powder, silica powder, silica-alumina powder; inorganic chromatic oxide pigments such as iron oxide, titanium yellow, chromium oxide, cobalt blue; inorganics such as cadmium red and cadmium yellow Sulfide pigments; inorganic silicate pigments such as ultramarine blue; inorganic chromate pigments such as yellow lead; various fine metal powders; azo pigments, phthalocyanine-based, quinacridone-based, dioxazine-based, perinone-based, anthraquinone-based, isoindolinone-based , Organic pigments such as quinophthalone type and perylene type.

Reinforcing fibers in the hiding layer, matrix resin,
The mixing ratio of the hiding material is not particularly limited, but is usually about 75: 20: 5 to 30:30:40 by weight. The thickness of the hiding layer is not particularly limited, but is usually about 30 to 200 μm.

An isolation layer is laminated on the concealing layer. The isolation layer is for preventing the hiding material in the hiding layer and the coloring material in the coloring layer, which will be described later, to be laminated on the isolation layer from being mixed with each other. Any thin film that can achieve this purpose can be used as the isolation layer in the present invention. The isolation layer is preferably transparent so as not to hinder the coloring by the colored layer, but it is not necessarily required to be transparent. As a preferable material, a transparent film of a thermoplastic resin made of nylon, polyurethane, polyethylene terephthalate or the like can be mentioned. The thickness of the isolation layer is not particularly limited, but usually about 10 to 50 μm is preferable.

A colored layer is laminated on the isolation layer. The coloring layer contains transparent reinforcing fibers, a matrix resin, and a coloring material. As the transparent reinforcing fiber, any of those conventionally used for a prepreg can be used, and any of the fibers described above in the description of the concealing layer can be used as long as it is transparent. Preferable examples include glass fiber, alumina fiber, thermoplastic resin fiber (polyethylene fiber, polyester fiber, nylon fiber, polyurethane fiber) and the like. Further, the thickness and shape of the reinforcing fiber are not limited at all, as in the case of the hiding layer.

Further, the matrix resin is preferably a transparent resin because it is easier to control the color when the color of the coloring material is as it is, but the matrix resin is not necessarily limited to a transparent resin. As the matrix resin, those exemplified in the description of the concealing layer can be adopted.

Preferable examples of the coloring material include, in addition to the coloring materials listed as the concealing material, metal flakes, coloring types for glass flakes, various vapor-deposited products, and lame color products.

Reinforcing fiber in the colored layer, matrix resin,
The mixing ratio of the coloring material is not particularly limited, but is 70: 2.
8: 2 to 40:40:20 are preferred. The thickness of the colored layer is not particularly limited, but is usually 30 to 200 μm.
A degree is preferable.

The hiding layer and the coloring layer can be easily manufactured by a prepreg manufacturing method well known in this field. Further, the laminating method can also be carried out based on a conventional method.

Although another fiber-reinforced resin prepreg layer is usually present under the above-mentioned concealing layer, it is not always necessary.

In a preferred aspect of the present invention, a polishing stock layer is provided on the colored layer. Usually, the prepreg is cured by winding the prepreg around the core material and then heating the wrapping with the tape, so that the prepreg in the outermost layer often has wavy tape marks.
This wavy mark can be made flat by polishing, but if the outermost layer is a colored layer, a part of the colored layer is scraped off by polishing, which is not preferable in appearance. Therefore, it is preferable to separately provide a polishing substitute layer as a layer to be polished on the colored layer.

The polishing stock layer contains transparent reinforcing fibers and a transparent matrix resin. As the transparent reinforcing fiber, those exemplified in the description of the colored layer can be preferably used. The morphology of the reinforcing fibers, like the other layers, is not limited in any way. As the transparent matrix resin, any of the resins exemplified in the description of the concealing layer can be preferably used as long as it is transparent, and examples thereof include an epoxy resin, an unsaturated polyester resin, and a vinyl ester resin. , Urethane acrylate resin and the like can be preferably used.

The mixing ratio of the reinforcing fibers constituting the polishing sublayer and the matrix resin is not particularly limited, but is usually about 80:20 to 30:70 by weight. The thickness of the polishing stock layer is not particularly limited, but is usually about 30 to 200 μm.

As mentioned above, the present invention further comprises (i) a hiding layer comprising reinforcing fibers, a cured matrix resin and a hiding agent, and (ii) a transparent isolation layer laminated on said hiding layer. A layer, and (iii) a transparent reinforcing fiber provided on the isolation layer,
Provided is an FRP having a colored layer including a cured matrix resin and a coloring material. This FRP can be produced by curing the above-mentioned prepreg of the present invention by a conventional method. Alternatively, it can also be produced by separately preparing the prepreg and the transparent film constituting each of the above-mentioned layers, laminating them on the prepreg or the core material to be coated, and then curing the prepreg or the core material according to a conventional method. The FRP of the present invention can be preferably applied to, for example, golf club shafts, ski poles, fishing rods, rackets such as tennis and badminton.

[0023]

EFFECTS OF THE INVENTION The present invention provides a prepreg having any coloring and an FRP obtained by curing the prepreg. In the prepreg of the present invention, since the hiding layer and the coloring layer are separated by the transparent separating layer, the hiding material in the hiding layer and the coloring material in the coloring layer do not mix with each other, and the desired coloring is ensured. Can be achieved.

[0024]

EXAMPLES The present invention will be described more specifically below based on examples. However, the present invention is not limited to the following examples. The matrix resin of the prepreg used was an epoxy resin.

Example 1 A carbon fiber prepreg was wound on a mandrel. Then, a prepreg containing titanium dioxide as a hiding pigment was wound thereon. A transparent nylon film as an isolation layer was laminated on the prepreg containing the hiding pigment. Then, a glass fiber reinforced prepreg containing silver-plated glass flakes as a coloring material was wound on the isolation layer, and taping was performed according to a conventional method to cure. Next, the core was removed, the tape was removed, and the surface was polished to complete a tubular product with a beautifully colored surface.

Example 2 A transparent nylon film as an isolation layer was laminated on a carbon fiber prepreg containing titanium dioxide as a concealing material, and a glass fiber prepreg containing silver-plated glass flakes as a coloring material was further laminated thereon. The prepreg of the present invention was manufactured by hot pressing. The prepreg thus produced was wound around a mandrel, taped and cured according to a conventional method. Then decore,
When the tape was removed and the surface was polished, a tubular product with a perfectly colored surface was completed.

Comparative Example 1 The same operation as in Example 2 was carried out except that a transparent nylon film was not laminated as the isolation layer. In the obtained tubular product, the hiding material and the coloring material were mixed, and the desired coloring was not obtained.

Claims (2)

[Claims] 1. (i) a reinforcing fiber and a matrix resin,
A hiding layer containing a hiding material, (ii) an isolation layer laminated on the hiding layer, (iii) a transparent reinforcing fiber provided on the isolation layer, a matrix resin, and a colorant A prepreg having a colored layer. 2. A hiding layer containing (i) reinforcing fibers, a cured matrix resin, and a hiding material, (ii) an isolation layer laminated on the hiding layer, and (iii) on the isolation layer. And a fiber-reinforced plastic having a colored layer containing transparent reinforcing fibers, a cured matrix resin, and a coloring material.