JPH0698624B2 - Method for producing fiber-reinforced plastic material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a fiber reinforced plastic material having a metal coating on its surface.

2. Description of the Related Art Fiber-reinforced plastic (FRP), which is a composite of resin and reinforcing fibers, is widely used in various fields because it has higher specific strength and specific elastic modulus than those made of resin alone.

By the way, in such FRP, a metal-plated film is often formed on the surface for the purpose of giving a design effect, improving wear resistance, and giving conductivity. However, in general, plating on FRP is extremely difficult, and the coating easily peels off. Therefore, for example, as described in JP-A-61-12872, after the metal powder is dispersed so as to be buried in the surface and the exposed surface is subjected to an etching treatment to elute the exposed metal powder. , The etching treatment surface is plated. In other words, the metal powder is eluted to form irregularities on the surface, and the so-called anchor effect due to the concave portions is expected. However, in this conventional method, the anchor effect is not so large because only the metal powder exposed on the surface is eluted by the etching treatment.

Problems to be Solved by the Invention The object of the present invention is to solve the above-mentioned drawbacks of the conventional method, and not only the metal coating is firm and difficult to peel off, but also the metal coating exerts a design effect, and the mechanical properties such as abrasion resistance are improved. FR that can improve the electrical characteristics and give conductivity
In order to provide a manufacturing method of P material.

Means for Solving the Problems In order to achieve the above object, in the present invention, the surface of a fiber reinforced plastic having reinforcing fibers having a metal coating disposed at least in a surface layer portion is ground or ground, and at least a part thereof is formed. Exposing the metal-coated reinforcing fiber of
A fiber reinforced plastic material including a step of etching a polished or ground surface to elute at least a part of the metal coating of exposed metal-coated reinforcing fibers, and a step of forming a metal coating on the etched surface. A method of manufacturing the same is provided.

The FRP material obtained according to the present invention is essentially a composite material of resin and reinforcing fibers, and in this respect, a conventional FRP material is used.
However, it has a metal coating on the surface, and the metal coating can exert a design effect, improve wear resistance, or impart conductivity.

Hereinafter, the present invention will be described in more detail in the order of manufacturing steps thereof. In the present invention, first, as shown in FIG. 1, a resin 1, a reinforcing fiber 2, and a reinforcing fiber 2 and a metal coating 3
FRP5 is obtained by combining with the metal-coated reinforcing fiber 4 subjected to. The FRP 5 itself may be manufactured by any conventionally known method, but the important thing is that the metal-coated reinforcing fiber 4 is
It is to be arranged on the surface layer of FRP5. In this state, however, the surface is covered with the resin 1, and the metal-coated reinforcing fiber 4 is not exposed.

In the above, the resin is FRP, which is usually used as a so-called matrix resin, for example, an epoxy resin,
Thermosetting resin such as unsaturated polyester resin, vinyl ester resin, phenol resin, polyimide resin, heat of polyphenylene sulfide resin, polysulfone resin, polyether sulfone resin, nylon resin, polycarbonate resin, ABS resin, polybutylene terephthalate resin, etc. It is a plastic resin.

In addition, reinforcing fibers are also commonly used in FRP, such as carbon fibers, glass fibers, organic high elasticity fibers (for example, aramid fibers), alumina fibers, alumina-silica fibers, silicon carbide fibers, boron fibers and the like. It is a strong and highly elastic fiber. These reinforcing fibers may be in any form such as continuous fibers, long fibers and short fibers, and may be multifilaments or monofilaments. It can also be used in the form of fabric such as fibers or mats.

Metals used for metal coating of reinforcing fibers include, for example, copper, nickel, lead, cobalt, aluminum, zinc,
Examples include simple metals such as tin, chromium, and iron, and alloys containing at least one of these simple metals as a main component. In addition, the coating of such metal on the reinforcing fiber may be performed by a known method such as electroplating, electroless plating, thermal spraying, vapor deposition, and ion plating. The coating thickness is 0.1-2 μm
It is a degree.

In the present invention, next, as shown in FIG.
The surface of the FRP 5 is polished or ground to expose at least a part of the metal-coated reinforcing fiber 4 in the surface layer portion.

Next, the polished or ground surface of FRP5 is etched with an acid such as nitric acid, hydrochloric acid or sulfuric acid, or an alkali such as sodium hydroxide. Then, as shown in FIG.
The metal coating 3 of the metal-coated reinforcing fiber 4 exposed on the surface is eluted, and a recess is formed in the eluted portion. The elution may be carried out only on a part of the metal coating of the metal coating reinforcing fiber exposed on the surface, as shown in FIG. 3, depending on the form of the metal coating reinforcing fiber, etc. May be done. Therefore, the extent of elution can be controlled by the concentration of the etching solution and the etching time.

In the present invention, next, as shown in FIG. 4, a metal coating 6 is formed on the surface subjected to the etching treatment. The coating 6 enters the concave portion of the metal coating 3 which is eluted by the etching process, and is firmly bonded to the FRP 5 by a large so-called anchor effect.

The metal forming the metal coating on the surface may be the same as that used for the metal coating of the metal-coated reinforcing fiber, but other than that, gold, silver, titanium or the like may be used. The type may or may not be the same as that used for metallization. In short, the type of metal may be selected according to the requirements such as a design effect, an improvement in wear resistance, or a need for imparting or improving conductivity. The formation of the coating may also be performed by the same method as that for obtaining the metal-coated reinforcing fiber. The thickness of the coating may be arbitrary, but it is usually about 5 μm to 2 mm.

In the above, the case where the metal-coated reinforcing fiber is used only in the surface layer part of the FRP and the reinforcing fiber having no metal coating is used in the other parts is explained, but the metal-coated reinforcing fiber is used in all parts. It is also possible. However, metal-coated reinforcing fibers are more expensive than those without metal coating and have a large specific gravity, so they are used only for the surface layer to reduce the cost of FRP, and to prevent the reduction in specific strength and specific elastic modulus. Is preferred.

Hereinafter, the present invention will be described in more detail based on Examples and Comparative Examples.

Example Toray Co., Ltd. carbon fiber "Torayca" T-300 is aligned in parallel with each other in one direction in a sheet form, and a first unidirectional prepreg impregnated with a B-stage epoxy resin is added to the carbon fiber. A second method in which copper-coated carbon fibers obtained by electroplating copper to form a copper coating having a thickness of 0.3 μm are aligned in one direction in parallel with each other in a sheet shape and similarly impregnated with a B-stage epoxy resin. A unidirectional prepreg was prepared.

Next, the first prepreg is wound around the tapered mandrel in two layers so that the carbon fibers are oriented in the circumferential direction of the mandrel, and the second prepreg is further provided on the first prepreg. Was wound in three layers so that the direction of was in the longitudinal direction of the mandrel, and a heat-shrinkable wrapping tape was further wound thereon.

Next, the above prepreg winding body is put in an oven, and the temperature is 120 ° C.
After preheating for 3 minutes at 120 ° C., the epoxy resin was cured by heating for 1 hour, and after curing at 130 ° C. for 2 hours, the mandrel was pulled out to obtain a tubular FRP.

Next, the surface of the FRP was ground by a cylindrical grinder to partially expose some of the copper-coated carbon fibers, and the polished surface was etched with a 1N nitric acid solution for 5 minutes to elute copper. , The surface was formed with irregularities.

Next, a copper coating having a thickness of about 5 μm was formed on the above-mentioned etched surface by electroless plating. Thus, the FRP material according to the present invention was obtained.

The FRP material exhibits a shiny copper color due to the copper coating,
The design effect was high. Further, a peeling test was carried out by sticking an adhesive tape at 10 places and peeling it off, but the coating did not peel off at 10 places.

Comparative Example An FRP material was obtained in the same manner as in the above example except that the copper coating was directly formed on the ground surface without performing etching treatment.

When this FRP material was subjected to the same peeling test as in the example, the coating was peeled off together with the adhesive tape at 3 out of 10 places.

EFFECTS OF THE INVENTION The present invention includes a step of polishing or grinding the surface of a fiber reinforced plastic having reinforcing fibers having a metal coating arranged at least in a surface layer portion to expose at least a part of the metal coating reinforcing fibers, and polishing or grinding. The surface thus etched is subjected to an etching treatment to elute at least a part of the metal coating of the exposed metal-coated reinforcing fiber, and a step of forming a metal coating on the surface subjected to the etching treatment. A large anchoring effect can be obtained by the formed recesses, and the metal coating is firm and difficult to peel off. Further, by selecting the type of metal forming the metal coating, it is possible to develop a design effect specific to the metal, improve mechanical properties such as wear resistance, or impart or improve conductivity. Will be able to.

[Brief description of drawings]

1 to 4 are schematic vertical cross-sectional model diagrams showing the present invention in the course of manufacturing steps. 1: Resin 2: Reinforcing fiber 3: Metal coating of reinforcing fiber 4: Metal coating Reinforcing fiber 5: FRP 6: Metal coating on FRP surface

Claims (1)

[Claims] 1. A step of polishing or grinding the surface of a fiber-reinforced plastic having reinforcing fibers having a metal coating on at least the surface layer portion to expose at least a part of the metal-coated reinforcing fibers, and the surface polished or ground. And a step of eluting at least a part of the metal coating of the exposed metal-coated reinforcing fiber, and a step of forming a metal coating on the surface subjected to the etching treatment.