KR101508931B1

KR101508931B1 - Method for producing metal coated glass fiber yarn

Info

Publication number: KR101508931B1
Application number: KR20130095800A
Authority: KR
Inventors: 박경래
Original assignee: 윈엔윈(주)
Priority date: 2013-08-13
Filing date: 2013-08-13
Publication date: 2015-04-06
Also published as: KR20150019221A

Abstract

The present invention relates to a method of producing a metal coated glass fiber yarn, comprising the steps of: preparing a glass fiber yarn; And a coating step of coating the prepared glass fiber yarn with a metal.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for producing a metal coated glass fiber yarn,

The present invention relates to a process for the production of metal coated glass fiber yarns, and more particularly to a process for the production of metal coated glass fiber yarns capable of increasing productivity using a melt coating.

Industrial inorganic fibers including glass fibers or basalt fibers are used as basic reinforcing materials for industrial materials replacing metals and woods. They are used as main raw materials for making glass fiber reinforced plastics by mixing with thermoplastic and thermosetting resins. For example, when injection molding or extrusion molding is carried out by injection molding or extrusion molding by adding an appropriate amount of glass fiber or the like, the dimensional stability of the injection molding or the extruded product is excellent, and the strength is significantly improved as compared with the case where only the resin is used.

However, because inorganic fibers are electrically insulative, they can not be used where antistatic properties or electromagnetic wave shielding properties are required, and their applications are limited. For example, when an airplane or an automobile part is made of metal, it is effective for shielding electromagnetic waves, but it becomes heavy and causes various problems. On the other hand, in the case of making parts using glass fiber (non-conductive), it is advantageous in terms of weight saving, but electromagnetic wave shielding is not performed and causes malfunction of the device.

In this regard, a method of imparting conductivity to the resin itself, a method of adding a metal piece or a metal wire to the resin, and the like have been used to produce antistatic or EMI (electromagnetic interference) shielding materials. Also, as disclosed in Korean Patent Laid-Open Publication No. 2010-11171, a method for producing electromagnetic wave shielding fibers by depositing metal atoms on a yarn in a vacuum chamber is disclosed.

On the other hand, a method of coating the surface of the fiber with a metal includes CVD, vacuum deposition, sputtering or impregnation. Coating by chemical vapor deposition, vacuum evaporation, or sputtering can coat each of the filament filaments, but requires a slow coating speed and expensive equipment, and is uneconomical because of difficulty in mass production. In the impregnation method, it is difficult to uniformly coat each of the filaments.

An object of the present invention is to provide a method for producing a metal coated glass fiber yarn which can be usefully used as an electromagnetic wave shielding material or the like.

Another object of the present invention is to provide a method for producing a metal coated glass fiber yarn, which can reduce manufacturing cost and increase productivity.

In order to accomplish the above object, the present invention provides a method for manufacturing a glass fiber yarn, comprising the steps of: preparing a glass fiber yarn; And a coating step of coating the prepared glass fiber yarn with a metal.

As the metal for coating in the present invention, one or more alloys selected from among aluminum (Al), tin (Sn), zinc (Zn) and lead (Pb)

In the present invention, it is preferable that the coating is a melt coating using a molten metal. Specifically, it is preferable to coat the glass fiber yarn in molten metal contained in the container. At this time, it is preferable to use a container made of boron nitride (BN) or graphite.

In the present invention, by using a method of melt-coating a metal such as aluminum on a glass fiber yarn, the productivity of the metal-coated glass fiber yarn can be remarkably increased.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a melt coating process diagram according to an embodiment of the present invention. Fig.

Hereinafter, the present invention will be described in detail.

The present invention relates to a method for producing a metal coated glass fiber yarn, and a method for preparing a metal coated glass fiber yarn according to an embodiment of the present invention includes preparing a glass fiber yarn; And a coating step of coating the prepared glass fiber yarn with a metal.

First, prepare glass fiber yarn. In the present invention, a yarn can be a yarn, that is, a state in which tens of yarns are folded together. The glass fiber yarn can be prepared by purchasing commercially available glass fiber yarn.

Next, the prepared glass fiber yarn is coated with a metal.

FIG. 1 is a process diagram of a molten coating process according to an embodiment of the present invention. In the present invention, it is preferable to coat the glass fiber yarn by passing the glass fiber yarn through molten coating using a molten metal, that is, molten metal contained in the container. The productivity of the metal-coated glass fiber yarn can be remarkably increased.

The method of partially coating glass fibers with a molten metal in units of monofilaments (one fiber) is extremely low in productivity. Therefore, it can not be manufactured with monofilaments when it is made into an EMC shielding material for industrial use. Accordingly, in the present invention, in order to increase the productivity, a method of putting in a molten metal in the form of glass fiber yarn and passing it through was adopted. Coating in the form of glass fiber yarn simplifies the process and enables mass production.

1, a glass fiber yarn 2 is unwound from an unwinder roll 1 and is guided by one or a plurality of transport rolls 3 and 4 to move to the container 6. The transfer or coating speed of the glass fiber yarn 2 is preferably 0.1 to 50 m / min.

At this time, it is preferable that the tensile strength of the glass fiber constituting the glass fiber yarn 2 is at least 25 g, preferably at least 50 g. The glass fiber yarn used herein can be coated if it is commercially available. As commercially available glass fiber yarns for use in the art, for example, glass fiber yarns for PCB (Printed Circuit Board) substrates can be used. Even more preferred are three-ply yarns (fiber diameters less than 5 microns).

A molten metal (7) is carried on the container (6), and one or more coating rolls (5, 8) are also provided.

The coating rolls 5, 8 serve to facilitate movement and coating while guiding the glass fiber yarns 2. In particular, by using a plurality of coating rolls 5, 8, the metal can be uniformly coated on the glass fiber yarn 2. [

The container 6 is preferably made of boron nitride (BN) or graphite. As the material of the container 6, a molten metal and a material having a low wettability are best, and BN or graphite ceramic is the best material. Boron nitride (BN) has a heat-resistant temperature of 2000 ° C or higher, a high chemical stability, and excellent electrical insulation, thermal conductivity, machinability and lubrication characteristics. Substance with high wettability (SUS or steel plate) reacts with molten metal quickly and accumulates sludge or scale, making it impossible to use for a long time.

The container 6 may have its own heat source to melt the metal directly. Alternatively, the container 6 may be injected into the container 6 after melting the metal in an external electric furnace or the like.

As the metal for glass fiber yarn coating in the present invention, any metal that melts at 700 ° C or lower can be used. For example, the metal can be used as a metal for the glass fiber yarn coating, such as aluminum (Al), tin (Sn), zinc (Zn) Type or two or more kinds of alloys can be used, and it is particularly preferable to use aluminum which is low in melting point and light and light in weight. In addition to molten Al metal, it is possible to increase the conductivity by using various kinds of molten metal, and it is advantageous to coat a metal having a melting point at a low temperature as possible, and it is also advantageous in consideration of safety in production.

To prevent oxidation of the molten metal, the melt coating equipment comprising the vessel 6 can be made in a chamber filled with inert gas, argon or nitrogen gas.

The glass fiber yarn 9 coated with a metal is formed and guided by one or a plurality of feed rolls 10 and 11 to be wound on the winding roll 12, Lt; / RTI >

It is preferable that the electrical resistance of the produced metal coated glass fiber yarn is 10 ^-4 Ω or less in order to be suitable for electromagnetic shielding applications.

The thickness of the metal coating layer may be 0.1 to 100%, preferably 1 to 50%, based on the thickness of the glass fiber yarn.

By coating the metal in the form of glass fiber yarn in this way, EMC shielding materials can be made more easily. The melt coating method according to the present invention is much less expensive than conventional vacuum deposition or sputtering and can be mass-produced. In the case of fibers other than glass fibers (chemical fibers), it is possible to coat the fibers having a higher melting point than the melting point of the metal.

The metal coated glass fiber yarn produced according to the present invention can be used as a BMC (Bulk Molding Compound) or an SMC (Sheet Molding Compound) and can be used as an electromagnetic wave shielding material for blocking electromagnetic interference, . These characteristics can also be applied to a chaff for radar disturbance or a blackout bomb for disabling the power grid.

[Example]

The glass fiber yarn for the PCB substrate was purchased from the market, and the glass fiber yarn was coated with Al using the coating equipment shown in FIG. At this time, BN was used as a container for containing molten Al.

[Test Example 1]

The electrical resistance of the Al-coated glass fiber yarn prepared in the examples was measured by a four-point probe measurement and was found to be about 5 × 10 ^-3 Ω.

Further, as a result of scanning electron microscope (SEM) observation, Al was uniformly and smoothly coated on the surface of the glass fiber yarn.

[Test Example 2]

The Al coated glass fiber yarn prepared in the example was cut into a 6 mm size and made into a chopped fiber. Then, the shielding specimen was made into a BMC by mixing with acrylic resin, and the electromagnetic wave shielding ratio was measured to be 60 dB.

As described above, those skilled in the art will understand that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the embodiments described above are all illustrative and not restrictive. The scope of the present invention should be construed as being included in the scope of the present invention without departing from the scope of the present invention.

1: unwinder roll
2: Glass fiber yarn
3, 4, 10, 11: Feed roll
5, 8: Coating roll
6. Container
7: Molten metal
9: Metal coated glass fiber yarn
12: Winding roll

Claims

Preparing a glass fiber yarn; And
And a coating step of coating the prepared glass fiber yarn with a metal,
The metal is at least one selected from aluminum (Al), tin (Sn), zinc (Zn), and lead (Pb)
The coating is a molten coating using a molten metal,
The glass fiber yarn is coated while passing completely through the molten metal contained in the container,
The vessel is made of boron nitride (BN) or graphite,
Wherein the produced metal coated glass fiber yarn has an electrical resistance of 10 ^-4 Ω or less.

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