JP6784159B2 - Manufacturing method of insulated wire and preparation method of replenishing paint used for it - Google Patents

Description

The present invention relates to a method for manufacturing an insulated electric wire and a method for preparing a supplementary coating material used therein.

As a method for manufacturing an insulated wire in which a wire is coated with an insulating coating layer, the wire is continuously passed through an electrodeposition coating to be electrodeposited on the surface, and then the electrodeposited wire is heated and the surface is electrodeposited. It is known that an insulating coating layer is formed by baking a coating film. Then, as an electrodeposition coating material used in the method for manufacturing such an insulated electric wire, for example, in Patent Document 1, as a block copolymerized polyimide resin particle as a charged resin particle and a neutralizing agent for neutralizing an anionic group contained therein. A dispersion containing the basic compound of the above is disclosed.

Japanese Unexamined Patent Publication No. 2015-156378

By the way, as shown in FIG. 7, when the conductive wire 11'is continuously passed through the electrodeposition coating material P'and the surface is electrodeposited, the charged resin particles contained in the electrodeposition coating material P'are consumed, so that electricity is applied. It is necessary to replenish the replenishing paint SP'while performing the painting. At this time, since the neutralizing agent n'is basically not consumed in the electrodeposition coating, if the replenishing paint SP'concentrated with the electrodeposition coating P'prepared at the initial stage is replenished, the neutralizing in the electrodeposition coating P' There is a problem that the concentration of the agent n'is increased, which hinders the precipitation of charged resin particles on the lead wire 11'and causes a poor appearance.

An object of the present invention is to suppress appearance defects in electrodeposition coating due to replenishment of replenishment paint to electrodeposition coating.

In the present invention, the conductor is continuously passed through an electrodeposition paint placed in a coating tank to electrodeposit the surface of the conductor, and then the electrodeposited wire is heated to electrodeposit on the surface of the conductor. A method for manufacturing an insulating electric wire for forming an insulating coating layer by baking a coating film by painting, wherein the electrodeposition coating material contains charged resin particles and a neutralizing agent that charges the reverse charge of the charge of the charged resin particles. The neutralizing agent is reduced after diluting the charged resin particles and the original coating material containing the neutralizing agent in the coating tank while passing the lead wire through the electrodeposition coating material. Replenish the replenishment paint prepared in the above.

The present invention is a method for preparing a replenishing paint to be replenished with an electrodeposition paint during continuous electrodeposition coating, wherein the electrodeposition paint is a reverse charge of a charged resin particle and a charge possessed by the charged resin particle. It is a dispersion liquid containing a chargeable neutralizing agent, and the amount of the neutralizing agent is reduced after diluting the charged resin particles and the original coating material containing the neutralizing agent.

According to the present invention, the replenishing paint prepared by reducing the amount of the neutralizing agent from the original paint is replenished in the paint tank, so that the concentration of the neutralizing agent in the electrodeposition paint replenished with the replenishing paint is suppressed from becoming too high. This makes it possible to suppress appearance defects in electrodeposition coating due to replenishment of the replenishment paint to the electrodeposition paint.

It is a perspective view of an insulated wire. It is a perspective view of another insulated wire. It is a figure which shows the process order of the manufacturing method of the insulated electric wire which concerns on embodiment. It is a figure which shows the insulation coating process. It is explanatory drawing which shows the replenishment of the replenishment paint to the electrodeposition paint. It is explanatory drawing which shows the preparation of the supplementary paint from the original paint. It is explanatory drawing which shows the preparation of the replenishing paint which goes from the original paint to the diluted paint. It is explanatory drawing which shows the replenishment of the replenishment paint to the conventional electrodeposition paint.

Hereinafter, embodiments will be described in detail.

(Insulated wire 10)
1A and 1B show an insulated wire 10 manufactured by the manufacturing method according to the embodiment. Even if the insulated wire 10 has a rectangular cross-sectional shape in which the upper and lower surfaces and both side surfaces are flat as shown in FIG. 1A, the upper and lower surfaces are flat as shown in FIG. 1B. It does not matter whether the cross-sectional shape formed on the curved surface formed and the both side surfaces bulge outward is flat. These insulated wires 10 are used, for example, in coils, noise filters, inductors, reactors and the like mounted on electronic substrates in the field of electrical and electronic equipment.

The insulated wire 10 includes a flat conducting wire 11 having a flat cross-sectional shape and an insulating coating layer 12 that covers the outer peripheral surface thereof.

The flat lead wire 11 is made of, for example, high-purity copper having a purity of 4N or more. The thickness of the flat lead wire 11 is, for example, 0.01 mm or more and 1 mm or less, and the width is, for example, 0.2 mm or more and 4.0 mm or less.

The insulating coating layer 12 is made of resin. The insulating coating layer 12 is preferably composed of a single treated layer. The thickness of the insulating coating layer 12 is, for example, 1.5 μm or more and 30 μm or less.

(Manufacturing method of insulated wire 10)
As shown in FIG. 2, the method for manufacturing the insulated wire 10 according to the embodiment includes a wire drawing step, a cold machining step, an annealing step, an oil removal step, and an insulation coating step. In these steps, each step may be performed in a batch manner, all steps may be carried out in a continuous manner, and for example, a wire drawing step and a cold working step may be carried out in a continuous manner. After that, only the annealing step may be performed by the batch method, and the batch method and the continuous method may be combined as in the case where the subsequent oil removal step and the insulation coating step are continuously performed.

<Wire drawing process>
In the wire drawing process, the rough drawn wire as a bus is reduced in diameter and drawn into a round wire having a circular cross section. The wire drawing process generally includes a process of passing a rough drawn wire through a wire drawing die. The outer diameter of the rough drawn wire is, for example, 8.0 mm, and the outer diameter of the round wire after drawing is, for example, 0.05 mm or more and 0.2 mm or less. The wire drawing process is usually performed in multiple steps. For example, a rough drawn wire having an outer diameter of 8.0 mm is first drawn so that the outer diameter is 2.6 mm or more and 3.2 mm or less, and then 0.6 mm. The wire is drawn so as to be 0.8 mm or more and 0.8 mm or less, and further drawn so as to be 0.05 mm or more and 0.2 mm or less.

<Cold processing process>
In the cold working step, the round wire drawn in the wire drawing step is cold-worked into a flat conducting wire 11 including a pair of flat surfaces parallel to the outer peripheral surface. Examples of the cold processing include rolling processing in which a round wire is passed between rollers of a rolling mill, processing in which a round wire is passed through a die, and the like. When manufacturing a rectangular insulated wire 10 having a flat cross-sectional shape with upper and lower surfaces and both side surfaces formed as flat surfaces as shown in FIG. 1A, the round wire is rolled in each of the thickness direction and the width direction. A flat lead wire 11 having a similar cross-sectional shape can be obtained. Further, in the case of manufacturing an insulated wire 10 having a flat upper and lower surfaces and a curved surface having both side surfaces bulging outward as shown in FIG. 1B, the round wire is formed in the thickness direction. A flat lead wire 11 having a similar cross-sectional shape can be obtained by rolling.

<Annealing process>
In the annealing step, physical properties such as the crystal grain size and 0.2% proof stress of the metal forming the flat lead wire 11 are adjusted by heat treatment. The heat treatment in this annealing step is preferably performed by a batch method from the viewpoint of making the characteristics in the length direction uniform. In that case, the bobbin wound with the flat wire 11 after the cold working step is put into the heat treatment furnace. After that, it is preferable to raise the temperature in the furnace to a predetermined holding temperature at a predetermined temperature rising rate, hold a predetermined holding time at the holding temperature, and then lower the temperature in the furnace at a predetermined temperature lowering rate. Here, the heating rate is, for example, 20 ° C./h or more and 2000 ° C./h or less. The holding temperature (annealing temperature) is, for example, 150 ° C. or higher and 1000 ° C. or lower. The holding time (annealing time) is, for example, 1 second or more and 100 hours or less. The temperature lowering rate is, for example, 10 ° C./h or more and 2000 ° C./h or less. When the heat treatment is performed continuously, the heat treatment conditions are, for example, an annealing temperature of 500 ° C. or higher and 900 ° C. or lower, and an annealing time of 1 second or longer and 60 seconds or lower. The heat treatment is preferably performed in an atmosphere of an inert gas such as nitrogen gas.

<Oil removal process>
In the oil component removing step, the oil component adhering to the outer peripheral surface of the flat wire 11 is washed and removed. The cleaning in this oil removal step is performed, for example, by immersing the flat lead wire 11 in a cleaning solution, pulling it up, and then spraying an inert gas such as nitrogen gas to scatter the cleaning solution adhering to the outer peripheral surface of the flat lead wire 11. be able to. Here, examples of the cleaning liquid include water (warm water), an organic solvent, and the like. When the cleaning liquid is water, the water temperature is, for example, 10 ° C. or higher and 60 ° C. or lower. Detergent may be included in the cleaning liquid.

<Insulation coating process>
In the insulation coating step, as shown in FIG. 3, the flat conductor wire 11 is continuously passed through the electrodeposition coating material P placed in the coating tank 21, and the surface of the flat angle conductive wire 11 is electrodeposited and then electrodeposited. By passing the lead wire 11 through a baking furnace 22 and heating it, a coating film by electrodeposition coating is baked on the surface of the flat lead wire 11 to form an insulating coating layer 12. The linear velocity of the flat lead wire 11 is, for example, 5 m / min or more and 40 m / min or less.

In the electrodeposition coating in the insulation coating step, an O / W type dispersion liquid containing charged resin particles and a neutralizing agent that charges the reverse charge of the charge of the charged resin particles is used as the electrodeposition coating material P, and a flat wire is used. By applying a voltage to the electrodeposition coating film P using 11 as an electrode opposite to the electric charge of the charged resin particles, a coating film of the charged resin particles in the electrodeposition coating film P is adhered to the outer peripheral surface of the flat conductor wire 11. The voltage applied to the electrodeposition coating material P may be applied by a constant current method or a constant voltage method. The applied voltage is, for example, 10 V or more and 100 V or less. The coating tank 21 containing the electrodeposition coating material P may be housed in a separate room, and the flat lead wire 11 may be immersed in the electrodeposition coating material P in a low vacuum atmosphere (100 Pa or more) or a nitrogen gas atmosphere.

In the coating film baking in the insulation coating step, the baking temperature, that is, the temperature inside the baking furnace 22, is, for example, 200 ° C. or higher and 500 ° C. or lower. The baking time is, for example, 5 seconds or more and 1800 seconds or less. The baking time can be adjusted by setting the linear velocity of the flat lead wire 11 and the length of the baking furnace 22. The coating film baking may be performed in one step with a single baking treatment temperature, or may be carried out in multiple steps with different baking treatment temperatures.

As described above, the electrodeposition coating material P used in the method for manufacturing the insulated electric wire 10 according to the embodiment is an O / W type containing charged resin particles and a neutralizing agent that charges the reverse charge of the charges of the charged resin particles. It is a dispersion liquid. The electrodeposition coating material P may be an anion type in which the charged resin particles have a negative charge, or may be a cationic type in which the charged resin particles have a positive charge.

Here, examples of the resin constituting the charged resin particles include polyamideimide resin, polyesterimide resin, polyimide resin, acrylic resin, epoxy resin, epoxy / acrylic resin, polyurethane resin, polyester resin and the like. As the resin constituting the charged resin particles, it is preferable to use one or more of these, and it is more preferable to use a polyamide-imide resin.

As the neutralizing agent, a basic neutralizing agent that forms a cation is used in the case of the anion-type electrodeposition coating material P, and an acidic neutralizing agent that forms an anion is used in the case of the cationic electrodeposition coating material P. ..

Examples of the basic neutralizing agent include amino alcohol compounds such as 2-aminoethanol (hereinafter referred to as "AE"), 2,2'-iminodiethanol, and 2-amino-2-methylpropanol; morpholin such as morpholin. System compounds; Piperazine compounds such as piperazine anhydride and piperazine hexahydrate; Alkyl amine compounds such as triethylamine and tripropylamine; Piperazine compounds such as piperazine and the like can be mentioned. As the basic neutralizing agent, it is preferable to use one or more of these, and it is more preferable to use AE.

Examples of the acid neutralizing agent include hydrochloric acid, acetic acid, propionic acid, lactic acid, cyanoacetic acid, inorganic acids such as phosphoric acid and sulfuric acid, and organic acids. As the acid neutralizer, it is preferable to use one or more of these.

The content of the neutralizing agent in the electrodeposition coating material P is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and preferably 15 parts by mass or less, based on 100 parts by mass of the charged resin particles. It is preferably 10 parts by mass or less.

The electrodeposition coating material P contains water as a dispersion medium. The water is, for example, ion-exchanged water or distilled water. The content of water in the electrodeposition coating material P is preferably 25% by mass or more, more preferably 30% by mass or more, and preferably 60% by mass or less, more preferably 50% by mass or less.

The electrodeposition coating material P may contain an aprotic polar solvent as a dispersion medium in addition to water. The "aprotic polar solvent" is a polar organic solvent excluding alcohol. Since the aprotic polar solvent has polarity, it has a high affinity for water, and when mixed with water, it dissolves without phase separation to form a uniform single phase. The aprotic polar solvent contained in the electrodeposition coating material P needs to be a good solvent for the charged resin particles. Examples of the aprotonic polar solvent include N-methyl-2-pyrrolidone (hereinafter referred to as “NMP”), dimethylformamide (hereinafter referred to as “DMF”), dimethylacetamide, and 1,3-dimethyl-2-imidazolidi. Non, γ-butyrolactone, dimethyl sulfoxide, sulfolane, cyclohexanone and the like can be mentioned. As the aprotic polar solvent, it is preferable to use one or more of these, and it is more preferable to use N-methyl-2-pyrrolidone.

The content of the aprotic polar solvent in the electrodeposition coating material P is preferably 340 parts by mass or more, more preferably 370 parts by mass or more, and preferably 1000 parts by mass or less with respect to 100 parts by mass of the charged resin particles. , More preferably 850 parts by mass or less. The content of the aprotic polar solvent in the dispersion medium is preferably 10% by mass or more, more preferably 20% by mass or more, further preferably 40% by mass or more, and preferably 90% by mass or less, more preferably 90% by mass or less. It is 80% by mass or less, more preferably 60% by mass or less. The mass ratio of the content of the aprotic polar solvent to the content of water (content of the aprotic polar solvent / content of water) is preferably 10/90 or more, more preferably 20/80 or more. Further, it is preferably 60/40 or less, more preferably 50/50 or less.

The electrodeposition coating material P may contain a colorant. Examples of the colorant include C.I. I. Solvent Black 3, C.I. I. Solvent Black 27, C.I. I. Examples include Solvent Black 7. As the colorant, it is preferable to use one or more of these, and C.I. I. It is more preferable to use Solvent Black 3. The content of the colorant in the electrodeposition coating material P is preferably 1 part by mass or more, more preferably 3 parts by mass or more, and preferably 20 parts by mass or less, more preferably, with respect to 100 parts by mass of the charged resin particles. Is 10 parts by mass or less. The electrodeposition coating material P may also contain an aprotic non-polar solvent such as naphtha, a protic polar solvent such as alcohol, and the like.

The initial solid content concentration of the electrodeposition coating material P is preferably 0.5% by mass or more, more preferably 1.0% by mass or more, and preferably 11.5% by mass or less, more preferably 11% by mass or less. Is. The solid content is a component such as charged resin particles remaining when the electrodeposition coating material P or the like is dried and solidified.

The 50% diameter (D ₅₀ : median diameter) of the electrodeposition coating material P is preferably 20 nm or more, more preferably 50 nm or more, and preferably 15,000 nm or less, more preferably 10,000 nm or less. The particle size of the electrodeposition coating material P is measured by, for example, a dynamic light scattering method using a zeta potential / particle size / molecular weight measurement system (ELSZ-2000ZS) manufactured by Otsuka Electronics Co., Ltd.

The viscosity of the electrodeposition coating material P is preferably 2 mPa · s or more, more preferably 4 mPa · s or more, and preferably 50 mPa · s or less, more preferably 30 mPa · s or less at a liquid temperature of 20 ° C. The viscosity of the electrodeposition coating material P is measured by a B-type viscometer (100 rpm).

The pH of the electrodeposition coating material P is measured by a pH meter and is, for example, 7 or more and 9 or less. The liquid temperature of the electrodeposition coating material P is, for example, 10 to 30 ° C.

The above electrodeposition coating material P is prepared, for example, by preparing an oil phase component and an aqueous phase component containing a resin constituting the charged resin particles, mixing them, and then stirring and emulsifying the phase inversion. Can be done. A general-purpose emulsifier, disperser, mixer, or stirrer can be used for this stirring. Specifically, for example, a rotor type or stator type mixer capable of applying high shear, a colloid mill, a homogenizer, a high pressure homogenizer and the like can be mentioned. The peripheral speed of the outer circumference of the stirring blade during stirring is preferably 1 m / min or more, more preferably 5 m / min or more, further preferably 10 m / min or more, and preferably 70 m / min or less, more preferably 70 m / min or less. It is 50 m / min or less, more preferably 30 m / min or less. The stirring time is preferably 3 minutes or more, more preferably 5 minutes or more, and preferably 60 minutes or less, more preferably 30 minutes or less.

In the method for manufacturing the insulated wire 10 according to the embodiment, as shown in FIG. 4, the charged resin particles contained in the electrodeposition coating material P are consumed. Therefore, the coating tank while passing the flat conductor wire 11 through the electrodeposition coating material P. The replenishing paint SP is replenished to 21 continuously or intermittently. Then, as shown in FIG. 5, the replenishing paint SP is made from the original paint OP composed of the O / W type dispersion liquid containing the same charged resin particles and the neutralizing agent n as the electrodeposition coating P, and the neutralizing agent. Prepared by reducing n. At this time, it is preferable to concentrate the original paint OP to increase the solid content concentration of the supplementary paint SP.

As shown in FIG. 7, when the replenishment paint SP'is replenished, if the replenishment paint SP'concentrated with the initially charged electrodeposition paint P'is replenished, the neutralizing agent n'in the electrodeposition paint P' There is a problem that the concentration of the charged resin particles increases, which hinders the precipitation of the charged resin particles on the lead wire 11'and causes a poor appearance. However, according to the method for manufacturing the insulated wire 10 according to the embodiment, as shown in FIG. 4, the replenishing paint SP prepared by reducing the amount of the neutralizing agent n from the original paint OP is replenished to the paint tank 21. It is possible to prevent the concentration of the neutralizing agent n in the electrodeposition paint P replenished with the paint SP from becoming too high, thereby causing the appearance in electrodeposition coating due to the replenishment of the replenishment paint SP to the electrodeposition paint P. Defects can be suppressed.

Here, the solid content concentration of the original coating material OP is preferably higher than the initial solid content concentration of the electrodeposition coating material P. The solid content concentration of the original coating material OP is preferably 3.0% by mass or more, more preferably 5.0% by mass or more, and preferably 13% by mass or less, more preferably 10% by mass or less, still more preferably. It is 8% by mass or less.

The content of the neutralizing agent n in the original paint OP is preferably 1 part by mass or more, more preferably 2 parts by mass or more, and preferably 15 parts by mass or less, based on 100 parts by mass of the charged resin particles. It is preferably 10 parts by mass or less, more preferably 5.0 parts by mass or less. The content of the neutralizing agent n with respect to 100 parts by mass of the charged resin particles in the original coating material OP may be the same as that of the electrodeposition coating material P.

The dispersion medium of the original coating material OP is preferably the same component as the dispersion medium of the electrodeposition coating material P. Therefore, when the dispersion medium of the electrodeposition coating material P contains water and an aprotic polar solvent, it is preferable that the dispersion medium of the original coating material OP also contains water and an aprotic polar solvent. In this case, the content of the aprotic polar solvent in the original paint OP with respect to 100 parts by mass of the charged resin particles, the content of the aprotic polar solvent in the dispersion medium, and the content of the aprotic polar solvent with respect to the water content. The mass ratio (content of aprotic polar solvent / content of water) is preferably the same as that of the electrodeposition coating material P. The dispersion medium of the original coating material OP is preferably the same as the dispersion medium of the electrodeposition coating material P. The original paint OP can be adjusted in the same manner as the electrodeposition paint P.

As a means for reducing the amount of the neutralizing agent n when preparing the supplementary coating material SP from the original coating material OP, for example, a means for filtering the original coating material OP to include the neutralizing agent n in the filtrate and removing the neutralizing agent n. Examples thereof include a means for removing the neutralizing agent by adsorbing it on an adsorbent, a means for removing the neutralizing agent n using a diaphragm electrode, and the like. Of these, from the viewpoint that concentration can be performed at the same time, a means for filtering the original paint OP and adding the neutralizing agent n to the filtrate to remove it is preferable. This is an effective means especially when the dispersion medium contains an aprotic polar solvent and concentration is difficult. Filtration is preferably performed using an ultrafiltration membrane having a pore size of 1 nm or more and 10 nm or less.

From the viewpoint of enhancing the effect of reducing the neutralizing agent n, as shown in FIG. 6, after preparing a diluted coating material DP in which the original coating material OP is diluted with a dispersion medium, the amount of the neutralizing agent n is reduced in the diluted coating material DP. Is preferable.

Examples of the dispersion medium used for this dilution include water and the aprotic polar solvents listed above. As the dispersion medium used for dilution, it is preferable to use a dispersion medium in which the dispersion medium of the diluted coating material DP after dilution is the same as the dispersion medium of the electrodeposition coating material P. Therefore, when the dispersion medium of the electrodeposition coating material P and the original coating material OP is the same, the dispersion medium used for dilution is preferably the same as the dispersion medium of the original coating material OP.

The dilution is preferably 5 volumes or more, more preferably 7 volumes or more, and even more preferably 10 volumes or more of the original paint OP.

The solid content concentration of the diluted coating material DP after dilution is preferably 0.30% by mass or more, more preferably 0.50% by mass or more, and preferably 4.0% by mass or less, more preferably 2.0. It is less than mass%. The solid content concentration of the diluted coating material DP after dilution is preferably lower than the initial solid content concentration of the electrodeposition coating material P. After that, in addition to reducing the amount of the neutralizing agent n, the diluted coating material DP is concentrated and electrodeposited. It is preferable to prepare a supplementary coating material SP having a solid content concentration higher than the initial solid content concentration of the coating material P.

The solid content concentration of the replenishing paint SP after the amount of the neutralizing agent n is reduced is preferably higher than the initial solid content concentration of the electrodeposition paint P. Further, the solid content concentration of the replenishing paint SP is preferably higher than the initial solid content concentration of the original paint OP. The solid content concentration of the replenishing paint SP is preferably 3.0% by mass or more, more preferably 4.0% by mass or more, and preferably 13% by mass or less, more preferably 10% by mass or less.

The content of the neutralizing agent n in the replenishing coating material SP is preferably 0.010 parts by mass or more, more preferably 0.10 parts by mass or more, and preferably 3. It is 0 parts by mass or less, more preferably 2.0 parts by mass or less, further preferably 1.5 parts by mass or less, still more preferably 1.0 part by mass or less. In order to disperse the charged resin particles, the replenishing paint SP also needs to contain a certain amount of the neutralizing agent n. Further, in the supplementary coating material SP, the concentration of the neutralizing agent n is preferably lower than the concentration of the neutralizing agent n of the original coating material OP by reducing the amount of the neutralizing agent n from the original coating material OP.

The dispersion medium of the replenishing paint SP is preferably the same component as the dispersion medium of the electrodeposition paint P. Therefore, when the dispersion medium of the electrodeposition coating material P contains water and an aprotic polar solvent, it is preferable that the dispersion medium of the original coating material OP also contains water and an aprotic polar solvent. In this case, the content of the aprotic polar solvent in the original paint OP with respect to 100 parts by mass of the charged resin particles, the content of the aprotic polar solvent in the dispersion medium, and the content of the aprotic polar solvent with respect to the water content. The mass ratio (content of aprotic polar solvent / content of water) is preferably the same as that of the electrodeposition coating material P. The dispersion medium of the replenisher coating material SP is preferably the same as the dispersion medium of the electrodeposition coating material P.

In the above embodiment, the rectangular insulated wire 10 having a flat cross-sectional shape is shown, but the present invention is not particularly limited to this, and for example, a square having a square cross-sectional shape having the same dimensions in the thickness direction and the width direction. It may be a round wire having a circular cross-sectional shape.

An O / W type dispersion containing water and an aprotic polar solvent NMP and DMF as a dispersion medium and containing charged resin particles of a polyamide-imide resin and AE as a basic neutralizing agent, and having a solid content concentration of 6.0%. The original paint was prepared. The content of AE was 1.90 μg / ml (3.3 parts by mass with respect to 100 parts by mass of charged resin particles).

In Example 1, a diluted coating material was prepared by adding the same dispersion medium as the original coating material to the original coating material and diluting it 3 times by volume. Subsequently, a part of the diluted paint is filtered using an ultrafiltration membrane to contain AE in the filtrate and removed to reduce the amount of salt AE and concentrate to obtain a supplement paint having a solid content concentration of 10% by mass. Prepared. The content of AE in the obtained replenishing paint was measured and found to be 1.10 μg / ml (1.1 parts by mass with respect to 100 parts by mass of charged resin particles).

In Examples 2 and 3, diluted paints obtained by diluting the original paints by 5 and 7 volumes, respectively, were prepared, and similarly filtered to prepare supplementary paints having a solid content concentration of 10% by volume, and the obtained supplements were obtained. When the content of AE in the paint was measured, it was 0.83 μg / ml (0.83 parts by volume with respect to 100 parts by mass of charged resin particles) and 0.84 μg / ml (0 with respect to 100 parts by mass of charged resin particles), respectively. It was .84 parts by volume).

Table 1 shows the AE content of the replenishing paints obtained in each of Examples 1 to 3. According to Table 1, it can be seen that the higher the dilution ratio of the original paint, the lower the content of AE in the obtained supplementary paint. This is because when the diluted paint is filtered to the same solid content concentration of 10% by mass, the higher the dilution ratio of the original paint, the larger the amount of filtrate to be separated, and the larger the amount of AE removed. is there.

The present invention is useful in the technical field of a method for manufacturing an insulated wire and a method for preparing a supplementary coating material used therein.

10 Insulated wire 11 Flat-angle lead wire 11'lead wire 12 Insulation coating layer 21 Paint tank 22 Baking furnace P, P'Electrodeposition paint OP Original paint SP, SP'Replenishment paint DP Diluting paint n, n'Neutralizer

Claims (4)

The surface of the lead wire is electrodeposited and coated by continuously passing the lead wire through the electrodeposition paint placed in the coating tank, and then the electrodeposition-coated lead wire is heated to coat the surface of the lead wire with the electrodeposition coating. It is a method of manufacturing an insulated wire that forms an insulating coating layer by baking.
The electrodeposition coating material is a dispersion liquid containing charged resin particles and a neutralizing agent that charges the reverse charge of the electric charge of the charged resin particles.
While passing the lead wire through the electrodeposition paint, the paint tank is replenished with the replenisher paint prepared by diluting the original paint containing the charged resin particles and the neutralizer and then reducing the amount of the neutralizer. Manufacturing method of insulated wire. In the method for manufacturing an insulated wire according to claim 1,
A method for producing an insulated electric wire, wherein the amount of the neutralizing agent is reduced by filtering a part of the original paint and adding the neutralizing agent to the filtrate to remove the neutralizing agent. In the method for manufacturing an insulated wire according to claim 1 or 2 .
A method for manufacturing an insulated electric wire that dilutes the original paint by 5 volumes or more. It is a method of preparing a replenishing paint that is replenished to the electrodeposition paint when continuously electrodeposited.
The electrodeposition coating material is a dispersion liquid containing charged resin particles and a neutralizing agent that charges the reverse charge of the electric charge of the charged resin particles.
A method for preparing a replenishing paint in which the amount of the neutralizing agent is reduced after diluting the charged resin particles and the original paint containing the neutralizing agent.

Images