JPS62124278A - Method for plating fiber reinforced plastic - Google Patents

Abstract

PURPOSE:To form a metallic layer having superior surface smoothness and hardness on fiber reinforced plastics by electroless plating, uniformly and efficiently, by allowing metallic colloid to be adsorbed on the surface of the plastics to form a layer of metallic particles and by subjecting the layer to electroless plating. CONSTITUTION:Fiber reinforced plastics consisting of reinforcing fibers such as glass or alumina fibers and plastics such as epoxy resin or polyamide is molded into a body 1 such as a cylinder by injection molding or other method. The molded body 1 is immersed in a bath contg. colloidal Pd particles to form a layer 2 of metallic Pd particles on the molded body 1. An Ni layer 3 is then formed efficiently and uniformly on the layer 2 by electroless plating. The Ni layer 3 has remarkably improved surface smoothness and hardness. A Cu or Ni layer 4 and a Cr layer 5 may be formed on the electrically conductive surface of the Ni layer 3 by electroplating so as to further improve the surface smoothness and hardness.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention has excellent surface smoothness and surface hardness.
The present invention relates to a method of plating a fiber-reinforced plastic material that can be made into a fiber-reinforced plastic molded article using a metal layer and a gold film.

[Conventional technology]

Fiber-reinforced plastics have mechanical strength that is inferior to metal materials, and because of their light weight, they are increasingly being used in industrial fields where metal materials are used.

However, due to the nature of fiber-reinforced plastic materials, even if various improvements are made to the molding method, the surface is not as smooth as molded products made from metal materials because of the presence of pinholes and minute cracks. There is a drawback.

Furthermore, its surface hardness is lower than that of molded products made from metal materials, so it is prone to wear due to contact with other objects or friction, or is extremely difficult to process into objects with high-precision surface roughness. There is a drawback.

Conventionally, a method has been proposed in which the surface of a fiber-reinforced plastic molded article is plated with metal as a method for obtaining a molded article made of fiber-reinforced plastic material without such difficulties.

[Problem that the invention seeks to solve]

Even if fiber-reinforced plastic molded products use carbon fibers or metal fibers as reinforcing fibers, the electrical resistance on the surface is high, and even if there is a conductive part, it is extremely uneven, and the surface may be damaged. The current situation is that metal plating is completely impossible, or even if it could be done, uniform and efficient plating is completely impossible.

[Means for solving problems]

Therefore, the present inventor conducted research to find a method for uniformly and efficiently plating the surface of a fiber-reinforced plastic molded product, and as a result, the present invention was completed.

The gist of the present invention resides in a plating method for tfRm reinforced plastic materials, which is characterized by adsorbing metal colloid onto the surface of fiber-reinforced plastic materials and then applying electroless metal plating. The present invention is a method of plating plastic materials, in which one or more metal electroplating layers are further applied to the surface of the plated material.

The reinforcing fibers constituting the fiber-reinforced plastic material yk used in carrying out the present invention are Glass II! Silent fibers, alumina fibers, carbon fibers, titanium carbide fibers, silicon nitride fibers, and titanium fibers can be used.
These fibers are preferably used in the form of long fibers or short fibers.

In addition, as matrix resins constituting fiber-reinforced plastic materials, thermosetting resins such as epoxy resins, unsaturated polyester resins, and polyimides are not used, but polyamides,
Thermoplastic resins such as polyester, ABS resin, polybutylene terephthalate, polypropylene, polyethylene, polysulfone, polyphenylene ether, etc. can be used.

In the present invention, a fiber-reinforced plastic molding material is formed into a molded body by a method such as an injection molding method or a pressure molding method, and then gold rice colloidal particles, such as palladium ions, are added to the surface of the molded body, such as stearyltrimethylammonium chloride, stearyltrimethylammonium chloride, etc.
The palladium particles are adsorbed by immersion in a colloidal palladium particle bath prepared by reduction in the presence of a dispersant such as sodium dodecylbenzenesulfonate or polyethylene glycol mono-p-nonylphenyl ether. A fiber-reinforced plastic molded body with a surface adsorbed with metal colloid particles, such as Kagu, has significantly improved surface properties compared to untreated molded bodies, so it can be coated with electroless plating in a highly efficient manner. A uniform metal plating surface layer can be formed.

As the electroless metal plating that can be used here, any commonly used electroless plating bath such as an electroless steel plating bath or an electroless nickel plating bath can be used.

The green fiber-reinforced plastic molded article with the metal plating layer produced as described above has significantly improved surface smoothness and surface hardness, but its excellent surface conductivity is By applying one or more electrometallic plating layers, the surface hardness and surface smoothness can be further improved, and these properties are in no way inferior to those of molded bodies made from metal materials. It can be made without. Various types of electroplating methods can be used, such as steel plating, nickel plating, and chrome plating, but those with a chrome electroplating layer as the outermost metal electroplating layer have particularly excellent properties. It can be equipped with the following.

The present invention will be explained in more detail with reference to Examples below.

Example 1 A metal colloid particle treatment bath containing colloidal palladium particles was prepared by reducing palladium ions in the coexistence of polyethylene glycol mono-p-nonylphenyl ether. The surface of a carbon fiber-reinforced plastic cleft cylinder with an inner diameter of 85φ, an outer diameter of 90φ, and a total length of 2600 mm is roughly polished with sandpaper, and then the cylinder is immersed in this metal colloid solution to form a cylindrical molded body. The metal colloid particles were adsorbed onto the surface. After immersing the cylinder for a certain period of time, the cylinder was taken out of the treatment bath and washed with water.The cylinder was then washed with N1ct2 concentration 0.1M, NaHPO2Sli degree 0.1M%NH4
The cylinder was immersed in an electroless nickel plating bath adjusted to a concentration of 2M in concentrated hydrochloric acid (=8.9), and after several hours the cylinder was removed from the plating solution, washed with water, and dried.

The thickness of the electroless nickel plating layer on the surface of the obtained molded body was 55μ. The electrical conductivity of the surface of the fiber-reinforced plastic cylinder thus produced was measured using a commercially available tester, and the resistance was found to be zero.

Actual gun example 2 Two fibre-reinforced plastic cracked cylinders with electroless nickel plating layer prepared in Actual example 1 were prepared, and their surface KN
Metals such as i or Cu were electrodeposited by electroplating. The thickness of the Ni or Car plating layer is 130 μm and 1 μm, respectively.
It was 55μ.

The plating conditions for Cu plating are 6V-70X.

30C1 approx. 1. The t-flow density was OA/d+n.

After that, these cylinders were further immersed in a chrome plating solution bath,
Hard chrome plating f: was carried out by an air plating method. The thickness of the chrome plating layer was 70μ, and the metal plate was 50C and 10A/am. After plating, the surface was polished by machining, and the dimensional accuracy was ±5/100 straightness.
m, circularity ±5/100 m, cylindricity ±5/100 m, and surface roughness 0.8 S. The surface workability was comparable to that of a metal molded body. The cross sections of these cylinders were of the structure shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a fibre-reinforced plastic cylinder obtained by the plating method of the present invention. Fiber reinforced plastic cylinder 2) Palladium metal particle layer 3) Electroless nickel plating layer Cu over Nit plating layer 5) Cr plating layer

Claims (2)

[Claims] (1) A method for plating fiber-reinforced plastic materials, which comprises adsorbing a metal colloid onto the surface of the fiber-reinforced plastic material and then applying electroless metal plating. (2) Fiber reinforcement characterized by adsorbing a metal colloid on the surface of a fiber-reinforced plastic material, then applying electroless metal plating, and further applying one or more layers of metal electroplating on the electroless metal plating layer. Plating method for plastic materials.