JPS62110975A - Plating treatment of carbon fiber bundle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for plating carbon fiber bundles, and more particularly to a plating method in which a pre-plating step is arranged prior to the main plating step.

<Prior art> Metal-coated carbon fibers, which are made by coating carbon fiber bundles with metal, are used in various applications such as reinforcing materials for thermosetting resins and thermoplastic resins, and rods used as electromagnetic shielding materials. .

Conventionally, in order to apply metal plating to this carbon Hkm east, an anode is placed in a plating tank, and the carbon fiber bundle is passed between several cathode rolls, run in a meandering manner, and immersed in the plating tank. ing.

<Problems to be Solved by the Invention> Incidentally, although the fibers of the charcoal Jm and w bundles have electrical conductivity, they have a higher specific resistance than metals, and moreover, they have a resistivity of 7 to 14p.
m ultrafine filament is 1.000 to 12.000
Since it is focused like a book, its surface resistance is also impressive.
Before the plating film is formed, the electrical resistance of medium length dust is high. For this reason, when plating the fibers, it is necessary to increase the voltage of the rectifier in order to pass current through the fiber bundle.Moreover, with the conventional contact method using the cathode roll, the plating process does not directly apply to the surface of the object to be treated. Since priority is given to power feeding to R>K fiber bundle, 1
Since the surface and center portions are likely to be plated unevenly and the electrical resistance of the plating film is low, the plating film is formed more concentrated on the first formed film.

For this reason, there is a drawback that it is difficult to form a uniform coating.

In response to such technical problems, the present invention aims to provide a plating process that includes a pre-plating process that can uniformly form a coating film on carbon fibers as a pre-stage of the above-mentioned main plating process. That is.

Step F to solve problems The present invention uses a plating bath as shown in FIG.

A cathode chamber 5 in which the cathode 4 is disposed and an anode chamber 7 in which the anode 6 is disposed are partitioned by an insulating partition wall 2 in which pores 3 are formed, and the carbon fiber bundles X are separated from the pores 3 in the insulating partition wall 2. Let it pass through the inside,
The present invention is characterized in that the pre-plating process, in which the plating process is carried out continuously from the cathode chamber 5 to the anode chamber 7, is placed in 1i) of the main plating process.

Effect> When the cathode chamber 5 and the anode chamber 7 are partitioned by the pores 3 of the insulating partition 172, the current from the anode 7 flows through the pores 3.
It will reach the cathode 4 via. Therefore, when the carbon fiber bundle X is passed through the pore 3, the filament of J Noto Fiber East Also, on the anode chamber 7 side at the rear of the pore 3, the apparent
It becomes the second cathode. What should be noted here is that if the object to be treated is a normal metal material, the object will be anodized on the cathode chamber 5 side and its surface will be dissolved. As a result, the plating solution becomes extremely dirty, making it difficult to perform proper plating work.
Moreover, it becomes necessary to isolate each electrolytic chamber. Further, the dissolution of the surface of the object to be processed causes defects on the surface. Therefore,
This treatment method is practically inapplicable. However, if carbon material is used, such a phenomenon does not occur, so there is no need to isolate the cathode chamber 5 and the anode chamber 7. Further, all of the filaments of the am bundle cathodized in the anode chamber 7 are supplied with electricity in the liquid, which makes it possible to supply electricity more uniformly than in the conventional contact method using a cathode roll. Therefore, uniform coating is applied to the peripheral surface of each filament of the carbon fiber bundle X at the rear of the pore 3. In addition, when moving from the cathode chamber 5 to the anode chamber 7, -・]-1, since there is no embellishment to guide it out of the tank, there is a gap between the area where the charcoal fiber bundle X becomes the anode and the area where it becomes the cathode. The distance can be made extremely short, so even if the voltage of the current is sufficiently low, current can be obtained and a thin plating film can be formed on the surface.
+ Becomes Ding Noh. The purpose of inserting the J-plate between the anode chamber and the cathode chamber is to suppress wasteful current flowing directly between the anode plate and the cathode plate.

The charcoal Z tJj fiber bundle X on which a thin plating film has been formed by the pre-plating process described above is further subjected to the main plating process. In this case, since a plating film has already been uniformly formed on the circumferential surface of the filament, the plating film serves as a cathode and plating is applied in an overlapping manner to form a metal film of a predetermined thickness.

<Example> An embodiment of the invention will now be described with reference to FIG. 2.3.

Reference numeral 1 denotes an electrodeposition tank for 1t1 plating applied to the present invention, in the center of which is installed an insulating partition wall 2 in which pores 3 are formed. It is divided. In the front compartment, - cathodes 4.
4 is arranged, and this chamber is used as a cathode chamber 5. In addition, in the rear compartment, there are also two anodes 6 facing left and right.
, 6 are arranged, and this chamber is used as an anode chamber 7.

At the front and back positions of the pore 3, the cathode chamber 5 and the anode chamber 7 include:
The guide rolls 8a, 8b are arranged in a immersed manner, and the carbon fiber bundle
Between b and 3, the paper passes through the pores 3 and travels in a straight line, and is further fed forward by passing through the rear running rolls 9b.

In the electrodeposition bath 1, a current flows between the anode 6.6 and the cathode 4.4 via the pores 3 and the carbon fiber bundles X. Therefore, in the carbon fiber bundle X running through the pores 3, the peripheral surface of the filament acts as an apparent anode at the front of the pores 3. Therefore, by electrolysis,
Oxygen gas is generated from within the carbon fiber bundle X. Due to the generation of such oxygen gas, the carbon #amTOX is loosened and opened, and the next pre-plating treatment can be performed satisfactorily.

At the rear of said pore 3, the peripheral surface of the filament of carbon mra TOX acts as a cathode. For this reason.

The peripheral surface of the filament is uniformly plated to form a thin plating film.

The carbon fiber bundle X subjected to the pre-plating treatment as described above is 1
It is continuously transferred to the main plating treatment tank IO side.

As shown in FIG. 2, in the main plating tank IO, guide rolls 11 and anodes 12 are arranged alternately in the tank, and a cathode roll 13 is further arranged on the anode 12.

The carbon fiber bundle X has a cathode roll 13 and a guide roll 1.
1 and 1 alternately run in a meandering manner, and a negative charge is applied by the cathode roll 13 to become a cathode. A plating film is formed on the filament surface.

During this wood plating process, since a plating layer 11 has already been formed on the surface of the filament in the electrodeposition tank 1, this coating serves as a cathode.

The plated film is then subjected to plating treatment.

Because the serious carbon fiber TOX is immersed in the plating tank IO for a long time due to its serpentine running, a sufficiently thick metal coating is formed.

The carbon fiber bundles X are subjected to the main plating treatment and sequentially transferred to the primary treatment tank 30 side.

FIG. 4 shows another embodiment of the invention.

That is, a pore 41 is formed at the center of the bottom at the entrance of the main plating tank IO, and a cathode wall 42 is formed on the inner surface.
A cylindrical insulating partition wall 40 in which a carbon fiber bundle
The guide roll 11 is passed through the pores 41 from below, and the cathode roll 13. It is configured to run in a meandering manner between the guide rolls 11.

In the embodiment described above, the cathode chamber 5 is configured within the insulating partition 40, and the interior of the main plating tank 10 serves as both the anode chamber 7 for pre-plating and the main plating tank. That will happen.

Even with such a configuration, pretreatment plating is applied to the filaments of the carbon fiber bundle X at a portion of the pores 41, thereby forming a plating film.

However, in such a method, a plating film is deposited on the cathode wall 42, so that it becomes necessary to replace the cathode wall 42 as needed.

<Effects of the Invention> As described above, the present invention allows the carbon fiber bundle x to pass through the pores of the partition wall, forms a plating film on the filament, performs a pre-plating process, and then performs a single plating process. As a result, the metal coating of the carbon m-male type X filament can be formed evenly and satisfactorily at a low voltage.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention, and FIG. 1 is a diagram of the principle of the method of the present invention, FIG. 2 is a side view of the first embodiment, FIG. It is a side view of a second example. l: Electrodeposition tank 2,40; Insulating partition wall 3.41; Pore
4; Cathode 5: Cathode chamber 6; Anode 7: Anode chamber 10.
Main plating tank 11; Guide roll 12; Anode 13
; Cathode roll 42; Cathode wall Sakero J, E Book March 5, 1986

Claims (1)

[Claims] The plating bath is divided into a cathode chamber in which a cathode is disposed and an anode chamber in which an anode is disposed by an insulating partition wall having pores formed therein, and the carbon fiber bundle is passed through the pores of the insulating partition wall. , the pre-plating process consists of continuous movement from the cathode chamber to the anode chamber.
A method for plating carbon fiber bundles, characterized in that the plating process is performed before the main plating process.