JPS61185363A - Preparation of colored coated metal wire - Google Patents

Abstract

PURPOSE:To improve manufacturing efficiency, by coating a colored ultraviolet curable resin solution containing a small amount of a fluorine compound to a coated metal wire preliminarily coated with an uncolored coating material and irradiating the coating layer with ultraviolet rays. CONSTITUTION:An uncolored enamel wire C is delivered from a winder 7 to be sent to a painting part 8 and coated with a colored ultraviolet curable resin solution. Thereafter, the coating layer is irradiated with ultraviolet rays in an ultraviolet irradiation apparatus 9 to obtain a colored enamel wire D. Two sets of reflective mirrors are radially provided in the ultraviolet irradiation apparatus 9 and an ultraviolet lamp is positioned at a first focus and the uncolored enamel wire C is allowed to pass the second focus thereof. The colored enamel wire D is taken up by a winder 13 at last.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for efficiently producing colored coated metal wire.

Conventional technology For coated metal wires such as enameled wires, colored enamel paint is applied to the metal wire while it is continuously running, and then the baking process is repeated many times by passing it through a furnace, and finally the surface is treated with paraffin etc. Manufactured by Enamelled wire requires perfect insulation, so the thickness of the coating layer must be strictly controlled to be uniform.
Therefore, in order to uniformly apply the enamel paint, the paint tank and the stock tank are connected via piping, and by constantly overflowing the paint, the concentration and viscosity of the paint is kept constant, and the applicator is made of metal. Minute efforts have been made to ensure that the coating thickness is constant over the entire circumference of the line, resulting in a complex composition for the entire coating group.

The reason why the application of enamel paint and the subsequent baking are repeated multiple times rather than in one cycle is to ensure uniform coating layer thickness, uniform baking, and adhesion. The purpose of this treatment is to make the subsequent steps after the winding process smooth.

Problems to be Solved by the Invention Normally, 1-coated metal wires are required to be colored in red, green, blue, young leaf color, etc. in addition to the natural color, so when changing one color, it is necessary to change the color of the previous color. In addition to replacing the paint with the next colored paint, the entire painting area must be thoroughly cleaned, and the paint tank, stock tank, and the piping that connects them,
All applicator tools and application aids must be cleaned using a large amount of solvent, which requires a great deal of effort and time. There is also a considerable amount of waste (cleaning waste liquid has a high viscosity and cannot be used for other purposes, so it is usually incinerated).
In addition, the burden of stopping production during the switching operation, which takes approximately 6 hours, is large, and furthermore, there is a problem in that coated metal wire is lost during the period when a steady state is reached after restarting.

As mentioned above, changing colors has various disadvantages, so we make production plans in advance and pay attention to the most efficient production order and production amount for each color, but due to changes in circumstances, certain colors may be It was inevitable that there would be overproduction or shortages of certain colors.

Further, the above-mentioned burning problem is not limited to the case where the metal wire is coated by a method, but the same problem occurs when the metal wire is coated by the extrusion method or the covering method.

The present invention has been made to solve these conventional problems.

Means for Solving the Problems The present invention is a method for manufacturing a coated metal wire by coating the metal wire with a coating material while running the metal wire continuously, and in which the coating is coated with a non-colored coating material in advance. ``A method for manufacturing a colored coated metal wire, which comprises coating a coated metal wire with a colored ultraviolet curable resin liquid containing a small amount of a fluorine compound, and then irradiating it with ultraviolet light.'' As a result, the above-mentioned conventional problems have been solved all at once.

In the clothing invention, metal wires include copper, copper alloys (silver-containing copper, chromium copper, zirconium copper, tin-containing 5-5 copper coated steel, etc.), aluminum, aluminum alloys (No. 1 aluminum alloy, heat-resistant aluminum alloy, etc.), Examples include aluminum-clad steel wire and various plated wires.

These metal wires are coated with a coating material for insulation or protection. As for the coating method, baking is the method,
Examples include the extrusion method and the covering method, and the method is particularly important for baking.

In the present invention, these metal wires are prepared by coating them with a non-colored coating material in advance. A non-colored coating material refers to a coating material that does not contain pigments or dyes, and the following materials are used, for example.

First, the coating materials used in the baking method are enamel paints, that is, oil-based enamels made by blending thermosetting resins with vegetable oil-modified alkyd resins, polyvinyl formal resins, phenolic resins, polyisocyanate resins, epoxy resins, and melamine resins. Examples include formals containing alkyd resins or modified products thereof, nylon enamels such as 66 nylon, polyester enamels, polyesterimide enamels, polyurethane enamels, polyamideimide enamels, and polyimide enamels.

Coating materials used in the extrusion method include natural rubber, synthetic rubber (styrene butadiene rubber, butyl rubber, EP rubber, chlorosulfonated polyethylene, chloroprene rubber, silicon rubber, etc.), synthetic resins (polyvinyl chloride, crosslinked vinyl, (polyethylene, crosslinked polyethylene, foamed polyethylene, polypropylene, nylon, etc.).

The covering materials used in the covering method include natural rubber,
Examples include synthetic rubber.

In the present invention, a colored ultraviolet curable resin liquid containing a small amount of a fluorine-based compound is applied to the non-colored coated metal wire prepared above.

Colored UV-curable resin liquids include unsaturated polyester, polyester acrylate, polyol acrylate, urethane acrylate, epoxy acrylate, silicone acrylate, polybutadiene acrylate, melamine acrylate, polyene/polythiol, spiran resin, epoxy Φ Lewis acid, The main ingredient is a polymerizable oligomer such as an amino alkyd, and a pigment or dye and, if necessary, additives such as a reactive diluent, a photopolymerization initiator, and a leveling agent are used.

Here, as the pigment or dye, since the method of resin curing is ultraviolet irradiation, one with good UV resistance is selected from common colorants, and the reactive double bond of the resin liquid is selected. Highly pure pigments are used that do not contain free amine compounds or metal ions that may generate radicals. Examples of pigments include phthalocyanine, induthrone, azo, and carbon black. , titanium oxide, calcium carbonate, talc, and dyes such as metal complex dyes, azo dyes, anthraquinone dyes,
Examples include carbonium-based 1=1 or 1:2 chromium complex salts. Incidentally, among these pigments, since there is a risk of insufficient curing when irradiated with ultraviolet rays, it is necessary to avoid adding a large amount of pigments.

Further, a small amount of a fluorine compound is added to the colored ultraviolet curable resin liquid. Typical examples of fluorine compounds include:
Examples include fluororesins such as homopolymers or copolymers of tetrafluoroethylene, homopolymers or copolymers of vinylidene fluoride, homopolymers or copolymers of chlorotrifluoroethylene, and in particular, homopolymers and copolymers of tetrafluoroethylene in an appropriate ratio. It is preferable to use them by mixing them. Examples of the comonomer include olefins, fluorine-containing olefins, perfluoroolefins, and fluoroalkyl vinyl ethers. Furthermore, a fluorine compound conductor or a fluorine surfactant can be used together with or in place of the fluororesin.

These fluorine-based compounds are added to the ultraviolet curable resin liquid as they are or in the form of a solution or dispersion. If the amount of the fluorinated compound is too small, the effect of addition will be insufficient, while if it is too large, the adhesion of the colored ultraviolet curable resin liquid to the coating layer of the non-colored coated metal wire may be impaired. It is often selected from the range of 0.001 to 5% by weight, particularly 0.01 to 3% by weight based on the entire ultraviolet curable resin liquid.

After a colored ultraviolet curable resin liquid containing a small amount of fluorine compound is applied to a non-colored coated metal wire, it is irradiated with ultraviolet rays to cure the coating layer. As the ultraviolet light source, a high pressure mercury lamp, a metal halide lamp, an electrodeless discharge tube, etc. are used.

A colored coated metal wire is obtained by irradiating ultraviolet rays, but in order to achieve more complete curing, it is also preferable to provide a heat curing step after the ultraviolet irradiation step, if necessary.

In the present invention, if necessary, it is preferable to further contact the colored coated metal wire obtained above with a fluorine compound liquid to provide a fluorine compound impregnated layer on the colored coating layer. Examples of the fluorine-based compound include the compounds mentioned above, and these compounds are used in the form of a solution or dispersion.

By providing a layer impregnated with a fluorine-based compound in this way, the slipperiness, heat resistance, and antifouling properties of the colored coated metal wire are further improved, and subsequent process operations such as winding and rewinding processes are facilitated. The durability is also improved.

Function In the present invention, the coating with the ultraviolet curable resin liquid plays the role of coloring the non-colored coated metal wire, and the fluorine-based compound added to this ultraviolet curable resin liquid mainly affects the colored coated metal wire obtained. Shows the effect of imparting slipperiness.

Example Next, the present invention will be explained in more detail with reference to Examples.

This example shows the case where the method of the present invention is applied to the production of colored enamelled wire. Hereinafter, "parts" refer to parts by weight.

FIG. 1 is a flow sheet showing an example of an enamelled wire manufacturing process.

(1) is a bobbin, on which hard copper wire (A) is wound. After this hard copper wire (A) passes through an annealing furnace (2), the soft copper wire 1 (
B) and sent to the enamelled wire coating device (3).

The enamel M coating device (3) consists of a coating section (4) and a baking oven (5). After the annealed copper wire (B) is coated with enamel paint in the coating section (4), baking is done in the oven (5). 5).

(4a) is a grooved applicator roll, (4b) is a felt to make the coated product uniform, (4c) is a paint tank,
(4d) is a stock tank, and the paint tank (4c) and the stock tank (4d) are connected through a pipe (4e) to constantly overflow the paint and keep the paint concentration constant.

(6) is a drive roll, and by driving this drive roll (6), the wire is fed out from the bobbin (1), passes through the annealing furnace (2), and is transferred to the coating section (4) and baked in the furnace (5). A circular run is made between the two.

The baking furnace (5) is usually in the shape of a pipe and passes steam or an inert gas (such as nitrogen) to prevent oxidation. The temperature for baking is often set at about 400 to 450°C.

After repeating this enamel coating and baking process a predetermined number of times, the non-colored enameled wire (C) coated to the desired thickness is wound up by a winder (7).

The uncolored enameled wire (C) is then unwound from the winder (7) and sent to the coating section (8), where it is coated with a colored ultraviolet curable resin liquid. Note that the winder (7) may be omitted and the non-colored enameled wire (C) after the baking process may be directly supplied to the coating section (8).

After applying the colored ultraviolet curable resin liquid, use the ultraviolet irradiation device (9)
The wire is irradiated with ultraviolet rays to produce a colored enameled wire (D). At this time, two sets of parabolic reflecting mirrors are installed in the ultraviolet irradiation device (9) so that the entire enameled wire is irradiated with ultraviolet rays, and the ultraviolet lamp is positioned at the first focus, and the second focus It is desirable that the non-colored enameled wire (C) should pass through. It is also desirable to include a blower for cooling the ultraviolet lamp.

(10) is a heating device provided as necessary to ensure complete curing when curing by ultraviolet radiation is insufficient.

(11) is a fluorine-based compound impregnating device provided as necessary, and here the colored enameled wire (D) is impregnated with a fluorine-based compound to be adhered thereto. (12) is a drying device used when this impregnation is performed, but since natural drying is also acceptable, this drying device (12) is used even when impregnated with a fluorine compound.
The drying step 2) can be omitted.

The colored enameled wire (D) manufactured through each of the above steps is
Finally, it is wound up by a winding machine (13).

A colored enamelled wire was manufactured according to the flow sheet described in ``U.'' under the following conditions.

Enamel paint in the painted area (4) Urethane enamel paint, viscosity 0.5 voids/40"C Baking in the oven (5) at a temperature of 420°C Enamel application - Baking process repeated 8 times Painted area ( Ultraviolet curable resin liquid composition in 8) Urethane acrylate oligomer 52 parts Benzophenone (
Photopolymerization initiator) 5 parts Phenoxyethyl acrylate (reactive diluent) 40 parts Barrier Color Red $3304 1 part (dye) Organosilane oligourethane acrylate
(Leveling agent) 1 part polytetrafluoroethylene 0.5 parts Tetrafluoroethylene-hexafluoropropylene copolymer 0.5 parts Ultraviolet lamp type Heating conditions in high-pressure mercury lamp heating device (10): 180°C, 20 seconds Colored enameled wire ( D) Wire diameter: 0.03 am The impregnation step using the fluorine compound impregnation device (11) and the drying step using the drying device (12) were omitted.As a result, an enameled wire clearly colored in red was obtained. The static friction coefficient of this colored enameled wire is as small as 0.083, while the static friction coefficient of the conventional paraffin-treated enameled wire is 0.
．． 075 to 0.095.

The colored enameled wire (D) after the heating process in the heating device (10) is impregnated with a treatment liquid in which polytetrafluoroethylene and a two-component derivative are emulsified and dispersed in a solvent in an impregnating device (11). Then drying device (12)
When dried with hot air, the static friction coefficient of the colored enameled wire was 0.058.

Effects of the Invention In the present invention, for enameled wire coating parts whose structure is complex due to strict control of film thickness, it is only necessary to manufacture uncolored coated metal wires, so the work required to change the color is reduced. Completely omitted. Instead, the color is changed in the process of applying the ultraviolet curable resin liquid, so the color changing work is added at this stage, but since the application of the colored ultraviolet curable resin liquid is simply for coloring, it is necessary to change the color first. There is no need for strict film thickness adjustment as with the enameled wire coating section, the configuration of the coating section can be greatly simplified, production stoppage time when changing colors can be reduced to about one hour, and the amount of cleaning solvent used can be reduced. Work hours are also significantly reduced,
Compared to the previous time, which took about 6 hours to change the color,
Significantly advantageous.

Furthermore, since a large quantity of non-colored coated metal wire can be manufactured in advance and then colored in a natural color at a necessary time, changes in the production plan can be responded to immediately.

Furthermore, since it contains a fluorine-based compound, the surface of the colored layer 5 has a small coefficient of friction and good slipperiness, and the paraffin treatment process that was previously required is no longer necessary, and the resulting colored coated metal wire has excellent wear resistance and heat resistance. It also improves surface smoothness, surface smoothness, and antifouling properties. Furthermore, by containing a fluorine-based compound, it becomes easy to clean and remove paint adhering to coating equipment.

[Brief explanation of the drawing]

FIG. 1 is a flow sheet showing an example of an enamelled wire manufacturing process.

Claims (1)

[Claims] 1. A method for manufacturing a coated metal wire by coating the metal wire with a coating material while continuously running the wire, the method comprising: coating the coated metal wire with a non-colored coating material in advance; , apply a colored ultraviolet curable resin liquid containing a small amount of fluorine compound,
A method for producing a colored coated metal wire, which comprises then irradiating it with ultraviolet light. 2. The method according to claim 1, wherein the fluorine compound is a fluororesin. 3. The method according to claim 1, characterized in that the colored coated metal wire after being irradiated with ultraviolet rays is further brought into contact with a liquid of a fluorine compound.