JPH0238271B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for efficiently manufacturing a colored coated metal wire.

Conventional technology For coated metal wires such as enameled wires, the process of applying colored enamel paint to the metal wire while it is continuously running, passing it through a baking oven and baking it is repeated many times, and finally surface-treating it with paraffin etc. Manufactured by. Since enameled wire is required to have perfect insulation, 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 stock tank are connected by piping, and the paint overflows at all times to maintain a constant concentration and viscosity of the paint. Minute efforts have been made to ensure that the coating thickness is constant over the entire circumference, and the entire painted area has a complex structure.

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 thickness of the coating layer, 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 Usually, coated metal wires are available in red, green, and other colors in addition to natural colors.
Paints that are colored blue, green leaves, etc. are required, so when changing colors, the previous colored paint must be replaced with the next colored paint, and the entire painted area must be thoroughly cleaned. , the coating tank, the stock tank, the pipes connecting them, the applicator, and the applicator aids all have to be cleaned using a large amount of solvent, so the cleaning process requires a lot of effort and time. This also results in a considerable loss of paint adhering to the equipment and the solvent required for cleaning (cleaning waste liquid has a high viscosity and cannot be used for other purposes, so it is usually incinerated), and even then it takes about 6 hours. There was a problem in that the production was stopped during the switching operation, which caused a heavy burden, and furthermore, the coated metal wire was lost during the period when the steady state was reached after restarting.

Since color changing has various disadvantages as described above,
We prepare a production plan in advance and pay attention to the most efficient production order and quantity for each color.
Changes in circumstances inevitably led to overproduction of certain colors and shortages of certain colors.

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

Means for Solving the Problems The present invention is a method of 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 by baking with a non-colored coating material in advance. A method for producing a colored coated metal wire, which comprises applying a colored ultraviolet curable resin solution containing 0.01 to 3% by weight of a fluorine-based compound to the coated metal wire, and then irradiating the coated metal wire with ultraviolet light. The summary is
This has led to the solution of the conventional problems mentioned above all at once.

In the present invention, metal wires include copper, copper alloys (silver-containing copper, chromium copper, zirconium copper, tin-containing copper, copper-coated steel, etc.), aluminum, aluminum alloys (No. 1 aluminum alloy, heat-resistant aluminum alloy, etc.), aluminum Examples include covered steel wire and various types of wire.

In the present invention, these metal wires are prepared in advance by baking and coating them with a non-colored coating material.
A non-colored covering material refers to a covering material that contains virtually no pigments or detergents, and the following are used, for example.

In other words, the coating materials used for baking include enamel paints, oil-based enamels made by blending thermosetting resins with vegetable oil-modified alkyd resins, polyvinyl formal resins with phenolic resins, polyisocyanate resins, epoxy resins, melamine resins, and alkyd resins. Examples include formals blended with these modified products, nylon enamels such as 66 nylon, polyester enamels, polyesterimide enamels, polyurethane enamels, polyamideimide enamels, and polyamide enamels.

In the present invention, a colored ultraviolet curable resin liquid containing 0.01 to 3% by weight of a fluorine 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,
The main ingredient is a polymerizable oligomer such as an epoxy Lewis acid or an aminoalkyd, 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 detergent, since the resin curing method is UV irradiation, one with good UV resistance is selected from common colorants, and
High purity materials are used that do not contain free amine compounds or metal ions that may generate radicals in the reactive double bonds of the resin liquid. Indathlon type, azo type, carbon black, titanium oxide, calcium carbonate, talc, etc., as dyes, metal complex dyes, azo type, anthraquinone type, carbonium type 1:1 or 1:
Examples include dichromium 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.

In addition, the above colored ultraviolet curable resin liquid has 0.01~
3% by weight of a fluorine compound is blended. Typical examples of fluorine-based compounds include fluorine-based resins such as homopolymers or copolymers of tetrafluoroethylene, homopolymers or copolymers of vinylidene fluoride, and homopolymers or copolymers of chlorotrifluoroethylene. It is preferable to use a mixture of an ethylene homopolymer and a copolymer in an appropriate ratio. Examples of the comonomer include olefin, fluorine-containing olefin, perfluoroolefin, fluoroalkyl vinyl ether, and the like. Further, a derivative of a fluorine-based compound or a fluorine-based surfactant can also be used together with the fluorine-based resin or in place of the fluorine-based resin.

These fluorine-based compounds are blended into the ultraviolet curable resin liquid as they are or in the form of a solution or dispersion. If the amount of fluorine-based compounds added is too small, the effect of addition will be insufficient,
On the other hand, if the amount is too large, there is a risk of impairing the adhesion of the colored ultraviolet curable resin liquid to the coating layer of the non-colored coated metal wire.

After a colored ultraviolet curable resin liquid containing 0.01 to 3% by weight of a 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 liquid of a fluorine compound to provide a layer impregnated with a fluorine compound in the colored coating layer. Examples of the fluorine-based compound include the compounds mentioned above, and this compound is used in the form of a solution or dispersion.
When a fluorine-based compound impregnated layer is provided 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 are facilitated, and durability during use is also improved.

Function In the present invention, the coating with the ultraviolet curable resin liquid plays the role of coloring the uncolored coated metal wire, and the fluorine-based compound added to this ultraviolet curable resin liquid serves to color the colored coated metal wire. Mainly has the effect of imparting slipperiness.

EXAMPLES 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, it becomes an annealed copper wire B and is sent to an enameled wire coating device 3.

The enameled wire coating device 3 includes a coating section 4 and a baking furnace 5. After the annealed copper wire B is coated with enamel paint in the coating section 4, it is baked in the baking oven 5.

4a is a coating roll with grooves, 4b is a felt for making the amount of coating uniform, 4c is a paint tank, 4
d is a stock tank, and the paint tank 4c and the stock tank 4d are connected through a pipe 4e to keep the paint concentration constant by constantly overflowing the paint.

Reference numeral 6 denotes a drive roll, and by driving this drive roll 6, the filament is fed out from the bobbin 1, passes through the annealing furnace 2, and circulates between the coating section 4 and the baking furnace 5.

The baking furnace 5 usually has the shape of a pipe,
Pass steam or inert gas (nitrogen, etc.) to prevent oxidation. The baking temperature is often set at around 400-450℃.

After repeating this process of applying and baking the enamel paint a predetermined number of times, the non-colored enameled wire C coated to the desired thickness is wound up by the winding machine 7.

Next, the uncolored enameled wire C is 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 the colored ultraviolet curable resin liquid is applied, ultraviolet rays are irradiated by an ultraviolet irradiation device 9, and a colored enameled wire D is manufactured. At this time, in order to irradiate the entire enamelled wire with ultraviolet rays, the ultraviolet irradiation device 9 is equipped with two circular reflecting mirrors, with an ultraviolet lamp positioned at the first focal point of each, and a second focal point of each. It is desirable that the non-colored enameled wire C passes through. It is also desirable to include a blower for cooling the ultraviolet lamp.

Reference numeral 10 denotes a heating device provided as necessary to ensure complete curing when curing by ultraviolet irradiation is insufficient.

Reference numeral 11 denotes a fluorine-based compound impregnating device provided as necessary, which impregnates and adheres the colored enameled wire D with a fluorine-based compound. Reference numeral 12 denotes a drying device for performing this impregnation, but since natural drying may be used, the drying step using the drying device 12 can be omitted even when impregnating with a fluorine-based compound.

Colored enameled wire D manufactured through each of the above steps
is finally wound up by a winding machine 13.

A colored enamelled wire was manufactured according to the above flow sheet under the following conditions.

Enamel paint in painting section 4 Urethane enamel paint, viscosity 0.5 poise/
40℃ Baking temperature in baking furnace 5 420℃ Enamel coating-baking process repeated 8 times Ultraviolet curable resin liquid composition in coating area 8 Urethane acrylate oligomer 52 parts benzophenone (photopolymerization initiator) 5 parts phenoxyethyl acrylate (reactivity Diluent) 40 parts Valifu Earth Color Red #3304 (dye)
1 part organosilane oligourethane acrylate (leveling agent) 1 part polytetrafluoroethylene 0.5 part Tetrafluoroethylene-hexafluoropropylene copolymer 0.5 part Ultraviolet lamp type High-pressure mercury lamp Heating conditions in heating device 10 180°C, 20 seconds Colored enameled wire D Diameter: 0.03 mm The impregnation step using the fluorine-based compound impregnating 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 blue enameled wire is
The coefficient of static friction was as small as 0.063, which was superior to that of conventional paraffin-treated enamelled wire, which had a coefficient of static friction of 0.075 to 0.095.

The colored enameled wire D after the heating process by the heating device 10 is impregnated with a treatment liquid in which polytetrafluoroethylene and a fluorine derivative are emulsified and dispersed in a solvent in an impregnating device 11, and then in a 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 the enamelled wire coating part, which has a complicated structure due to strict film thickness control, it is only necessary to manufacture a non-colored coated metal wire, 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, the production stop time when changing colors can be about one hour, and the amount of cleaning solvent used can be reduced. The number of man-hours required is also significantly reduced, which is extremely advantageous compared to the conventional method that required about 6 hours to change the color.

Furthermore, since a large quantity of non-colored coated metal wires can be manufactured in advance and colored in an appropriate 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 has a low coefficient of friction and good slipperiness.
The paraffin process, which was previously required, is no longer necessary.
The abrasion resistance, heat resistance, surface smoothness, and stain resistance of the obtained colored coated metal wire are also improved. Furthermore, by containing a fluorine-based compound, it becomes easy to clean and remove paint adhering to coating equipment.

[Brief explanation of drawings]

FIG. 1 is a flow sheet showing an example of an enamelled wire manufacturing process. 1...Bobbin, 2...Annealing furnace, 3...Enamel wire coating device, 4...Coating section, 4a...Applying roll, 4b...Felt, 4c...Paint tank, 4d...
...Stock tank, 4e... Piping, 5... Baking furnace, 6... Drive roll, 7... Winding machine, 8...
Painting section, 9... Ultraviolet irradiation device, 10... Heating device, 11... Fluorine compound impregnation device, 12...
Drying device, 13... Winding machine, A... Hard copper wire, B...
... Annealed copper wire, C... Non-colored enameled wire, D... Colored enameled wire.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a coated metal wire by coating the metal wire with a coating material while continuously running the wire, which method includes coating the coated metal wire with a coating material that is not colored in advance. A method for producing a colored coated metal wire, which comprises applying a colored ultraviolet curable resin solution containing 0.01 to 3% by weight of a fluorine compound, and then irradiating it with ultraviolet light. 2. The method according to claim 1, wherein the fluorine compound is a fluorine resin. 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.