KR19990083015A - Method for producing polymerized coating and an insulative coating-covered metal conductor - Google Patents

Abstract

Method for producing a polymer coating film is the step of immersing the metal conductor in an alkaline aqueous solution containing a phenol derivative and alkylamine substituted in positions 4, and the positions 2, 3, 5 and 6 are substituted or unsubstituted and the metal conductor Using the electrode as an electrode, characterized in that it comprises the step of electrolytic polymerization of the phenol derivative.

Description

METHOD FOR PRODUCING POLYMERIZED COATING AND AN INSULATIVE COATING-COVERED METAL CONDUCTOR}

The present invention relates to a polymer coating film of an organic polymer obtained through an electrolytic polymerization reaction and a production method thereof. The present invention also relates to a method of coating an insulating coating film on a metal material using the above method of producing a polymer coating film, and a metal conductor coated with such an insulating coating film. The present invention further relates to a method of coating a polymer coating film electrically insulated on a surface of a metal coil or the like.

Recently, with the rapid miniaturization and performance improvement of electronic devices, miniaturization and performance improvement of coils are urgently needed as components of these devices. Since a plurality of leads coated with an insulating coating film are often inserted in a limited space, a conductor having a thinner coating film is required. When a large number of conductors are inserted in a limited space, the insulation coating may be more likely to occur in the conductor coated with the insulation coating so that the insulation coating may be caused by a needle such as an automatic winding device, such as an unusual short circuit or insufficient grounding. It causes a problem.

In the field of conductive coatings coated with an insulating coating film, particularly in the field of conductive coatings coated with an insulating coating film having a flat cross section, conductive wires coated with a relatively thick insulating coating film such as about 8 μm to about 20 μm have been used. In general, conductive wires coated with an insulating coating film are produced by applying an insulating varnish to a metal conductor, stretching it linearly, and firing the hybrid material. In the field of conductors coated with an insulating coating film having a flat rectangular cross section, conductors coated with an insulating coating film having an insulating coating film having a thickness of several micrometers or less have not yet been developed. The reason is that it is possible to form a thin insulating coating film on both main planes of the flat rectangular metal conductor by optimizing the application and firing of the insulating varnish, but it is still difficult to stably form a thin insulating coating film on both sides of the metal conductor. . On the other hand, after forming an insulating coating film on a metal conductor having a circular cross section, the hybrid material may be rolled to produce a conductive wire coated with an insulating coating film having a flat rectangular cross section. However, since conductors coated with an insulating coating film made in this way have a certain residual stress on their insulating coating film, there is a problem that cracks easily occur in the insulating coating film when the rolling rate is large and / or the insulating coating film is thin. have. Thus, resistance to breakdown voltage and / or thermal shock is greatly reduced.

One method of forming a thin insulating coating film on a metal conductor is to form a thin polymer coating film of a polymer electrically insulated from the metal conductor by using an electrolytic polymerization reaction. At this time, the metal conductor is used as an electrode. A method of forming a thin coating film of a polymer electrically insulated from a metal conductor using an electrolytic polymerization reaction is described by Electrochimica Acta, 22, 451-457 (1977) and Journal of Applied Electrochemistry, 9 , 483-493 (1979).

As described above, a conductor coated with a thin insulating coating film is preferable because a plurality of conductors are frequently inserted in a limited space for miniaturization and performance improvement of the coil. Electrolytic polymerization is seen as a possible method used to form a thin insulating coating film. In addition, even if the insulating coating film of the conductive wire coated with the insulating coating film is damaged by inserting a plurality of conductive wires into the limited space, the insulation defect of the damaged part of the metal conductive wire coated with the insulating coating film using the electrolytic polymerization reaction is relatively corrected. Easy to be

However, the conventional electrolytic polymerization reaction uses only iron as the metal conductor. In addition, the electrolytic polymerization method produces a polymer coating film that is electrically insulated, and thus, as the polymer coating film is coated on the electrode, conductivity decreases, making it difficult to produce a polymer coating film having a sufficient thickness.

Figure is a schematic diagram showing a polymer coating film production apparatus used in the method for producing a polymer coating film according to Example 12 of the present invention.

According to the present invention, the method for producing a polymer coating film is a step of immersing the metal conductor in an alkaline aqueous solution containing a phenol derivative and alkylamine which is substituted or unsubstituted at positions 4, 2, 3, 5 and 6 Wow; And electrolytic polymerization of the phenol derivative using a metal conductor as an electrode.

On the other hand, the method for producing a polymer coating film according to the present invention is a phenol derivative which is substituted or unsubstituted at positions 4, 2, 3, 5 and 6, and a polymerizable monomer having an unsaturated carbon-to-carbon bond, and alkyl Dipping a metal lead in an alkaline aqueous solution containing an amine; And electrolytic polymerization of a polymerizable monomer having a bond between a phenol derivative and an unsaturated carbon using a metal conductor as an electrode.

On the other hand, the method for producing a polymer coating film according to the present invention is a phenol having no substitution position 4, at least one position selected from positions 2, 3, 5 and 6 and at least one substituent has an unsaturated carbon-to-carbon bond Dipping the metal conductor in an alkaline aqueous solution containing a derivative; And electrolytic polymerization of the phenol derivative using a metal conductor as an electrode.

On the other hand, the method for producing a polymer coating film according to the present invention is a phenol having no substitution position 4, at least one position selected from positions 2, 3, 5 and 6 and at least one substituent has an unsaturated carbon-to-carbon bond Dipping the metal conductor in an alkaline aqueous solution containing a derivative and a polymerizable monomer; And electrolytic polymerization of the phenol derivative and the polymerizable monomer using a metal conductor as an electrode.

In one embodiment of the invention, the metal conductor is a metal conductor whose composition contains Cu.

In another embodiment of the invention, further comprising the step of immersing the metal conductor formed on top of the polymer coating film in water or any aqueous solution, or alcohol solution except the alkaline aqueous solution after the electrolytic polymerization reaction.

In another embodiment of the invention, further comprising the step of heating the polymer coating film formed from the electrolytic polymerization reaction after the electrolytic polymerization reaction.

In another embodiment of the invention, the metal conductor is covered with an electrically insulating coating film, the insulating coating film including a defect site.

In another embodiment of the invention, the alkaline aqueous solution is substituted with alkylamines in addition to phenol derivatives in which position 4 is unsubstituted, at least one position selected from positions 2, 3, 5 and 6 and at least one substituent has an unsaturated intercarbon bond. It contains.

In another embodiment of the invention, a phenol derivative having no substitution at position 4, at least one position selected from positions 2, 3, 5, and 6 and at least one substituent having an unsaturated carbon-to-carbon bond is 2-allylphenol ( allylphenol), 2- (1-prophenyl) phenol (2- (1-prophenyl) phenol), or 2-allyl-6-methylphenol.

In another aspect of the invention, the metal conductor coated with the insulating coating film comprises a metal conductor and a polymer coating film formed on part or the entire surface of the metal conductor by any one of the above-mentioned methods.

The present invention will be clearly understood through the following detailed description with reference to the accompanying drawings to those skilled in the art.

Hereinafter, a method of producing a polymer coating film according to the present invention will be described.

According to the first aspect of the present invention, the method for producing a polymer coating film is an alkaline aqueous solution containing a phenol derivative and alkylamine which are unsubstituted or substituted in positions 4, 2, 3, 5 and 6 Dipping the metal conductor; And electrolytic polymerization of the phenol derivative using a metal conductor as an electrode. The method is described below.

Substituents at positions 2, 3, 5, and 6 of the phenol derivatives at positions 4 and unsubstituted or substituted at positions 2, 3, 5, and 6 include, but are not limited to: 1-12 Saturated or unsaturated aliphatic hydrocarbon groups having 1 to 7 carbon atoms, or aromatic hydrocarbon groups having 6 to 12 carbon atoms; Alkoxy group (RO-); Alkoxyalkyl group (ROR-); Acyl group (RCO-); Alkoxycarbonyl group (ROCO-); Amide group (RCONH-); Carbamoylalkyl groups (H ₂ NCOR—); And a hydroxyalkyl group (HOR-), wherein R represents a monovalent or divalent alkyl group having 1 to 12 carbon atoms, preferably 1 to 7 carbon atoms.

Alkylamines are used monoalkylamines, dialkylamines or trialkylamines containing alkyl groups having from 1 to 4 carbon atoms, for example (methylamine, ethylamine, n-propylamine, isopropyl). Amine, n-butylamine, isobutylamine, t-butylamine, dimethylamine, diethylamine, di (n-propyl) amine, di (isopropyl) amine, di (n-butyl) amine, di (isobutyl ) Amine, di (t-butyl) amine, trimethylamine, triethylamine, tri (n-propyl) amine, tri (isopropyl) amine, tri (n-butyl) amine, tri (isobutyl) amine, or tri (t-butyl) amine). It is also possible to use monoalkylamines, dialkylamines or trialkylamines containing alkyl groups having 5 or more carbon atoms, or substituted alkylamines such as ethanolamine, diethanolamine or triethanolamine.

In solubility in alkaline aqueous solutions, monoalkylamines or dialkylamines containing alkyl chains having up to 3 carbon atoms, such as ethylamine, dimethylamine or diethylamine, are preferred. For the same reason, alkylamines having hydrophilic substituents such as ethanolamine, diethanolamine or triethanolamine are also preferred.

Alkaline aqueous solution is defined as a solution containing water as a solvent and, optionally, an alcohol or other polar solvent, and further adding a base compound. Alcohols include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, t-butyl alcohol, 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol and ethylene glycol Included. Polar solvents include acetonitrile, dimethylformamide, dimethyl sulfoxide, N-methyl pyrrolidone (NMP), and propylene carbonate. Basic compounds include sodium hydroxide, potassium hydroxide, calcium hydroxide and alkali metal alcohol oxides.

The concentration of the phenol derivative unsubstituted at position 4 and unsubstituted or substituted at positions 2, 3, 5 and 6 is from about 0.01 to about 10 moles / liter, preferably from about 0.1 to about 2 moles / liter. The concentration of alkylamine is about 0.05 to about 1 mole / liter, preferably about 0.1 to about 0.6 mole / liter. The concentration of the basic compound is about 0.5 to about 2 times the molar amount of the phenol derivative in which the molar amount of the basic compound is unsubstituted at position 4 and is substituted or unsubstituted at positions 2, 3, 5 and 6, preferably about 0.5 To about 1.2 fold.

As the metal conductor, a metal conductor whose composition includes Zn, Sn, Ni, Al, Cr, Fe, Cu, Ti, Ag, Pd, In, Pt, Au, or an alloy thereof can be used. Examples of preferred metal conductors are metal conductors whose composition comprises Cu or alloys thereof. Here, a metal conductor "wherein the composition comprises a predetermined element (eg Zn, Sn, Ni, Al, Cr, Fe, Cu, Ti, Ag, Pd, In, Pt, Au)" is included in the predetermined element. It refers to a metal composition containing at least one metal component.

As a counter electrode used in the electrolytic polymerization reaction, an electrode containing at least one kind of various materials such as Fe, stainless steel, Al, Pd, Pt, Au, or C can be used.

Equation 1 represents an electrolytic reaction that takes place in the form of anodic oxidation of the phenol derivatives at positions 4 and unsubstituted or substituted at positions 2, 3, 5 and 6 and the use of metal conductors as working electrodes. In particular, this reaction is a reaction in which phenoxide ions are oxidized to phenoxy radicals in the presence of an alkaline aqueous solution.

Here, X ₂ , X ₃ , X ₅ and X ₆ represent hydrogen or substituents at positions 2, 3, 5 and 6 mentioned above, respectively.

The potential of the working electrode in the electrolytic polymerization reaction depends on the reaction conditions, such as the chemical structure of the particular phenol derivative with or without substitution at position 4 and at positions 2, 3, 5 and 6 and the alkaline aqueous solution used. The voltage applied between the electrodes is not limited but is preferably about 0.5 to about 5 V.

A series of reactions ranging from electrolytic polymerization to growth of insulating polymers are carried out through coupling reactions between monomers or phenoxy radicals of the polymer, thereby increasing the number of repeat units of the polymerization reaction as shown in Equation 2. The electrically insulating coating film grows as these reactions progress, and the anode (ie, working electrode) is deactivated so that the current flowing during the electrolytic reaction gradually decreases until a polymerization reaction occurs and the formation of the coating film is stopped.

As such, a conventional method of forming a polymer coating film through an electrolytic polymerization reaction of a phenol derivative is known, but since a growth of the coating film is stopped at a relatively early stage of the reaction, a coating film having a thickness of about 0.1 μm (for a Cu electrode) is formed. I can only do it. In contrast, since the method of the present invention uses alkylamine dissolved in an alkaline aqueous solution, it is possible to form a polymer coating film having a thickness of about 0.5 μm or more, preferably about 2 μm or more.

According to a second aspect of the present invention, the method for producing a polymer coating film is a phenol derivative, which is substituted or unsubstituted at positions 4, 2, 3, 5 and 6, and is capable of polymerization having unsaturated carbon bonds. Immersing the metal conductor in an alkaline aqueous solution containing the monomer and the alkylamine; And electrolytic polymerization of a polymerizable monomer having a bond between a phenol derivative and an unsaturated carbon using a metal conductor as an electrode. This method is described below.

As a starting material, a polymerizable monomer having an unsaturated carbon-to-carbon bond exists in an alkaline aqueous solution containing a phenol derivative and an alkylamine which are unsubstituted at position 4 and substituted or unsubstituted at positions 2, 3, 5, and 6. It is possible to simultaneously generate a radical addition polymerization reaction using phenoxy radicals generated through an electrolytic reaction. Therefore, as the polymer component, a thicker polymer coating film containing a polymerizable monomer having a phenol derivative and an unsaturated carbon bond can be formed on the surface of the metal conductor electrode.

The polymerizable monomer which can coexist in an aqueous alkaline solution in a dissolved state is used as a polymerizable monomer having an unsaturated intercarbon bond. Such polymerizable monomers include, but are not limited to, the following monomers having unsaturated carbon bonds, for example acrylamide, methacrylamide, hydroxyalkyl acrylate (E.g. hydroxyethyl acrylate), hydroxyalkyl methacrylate (e.g. hydroxyethyl methacrylate), acrylic acid, methacrylic acid, polyalkyl Polyalkyleneglycol (di) acrylic acid (e.g. polyethylene glycol (di) acrylic acid), polyalkylene glycol (di) methacrylic acid (e.g. polyethylene glycol (di) methacrylic acid), dialkylaminoalkyl acrylic acid acrylate), dialkylaminoalkyl methacrylic acid, acryloyloxyalkyltrialkylammonium chloride or methacryloyloxyalkyl tree chloride Kill ammonium (methacryloyloxyalkyltrialkyl ammonium chloride). The concentration of polymerizable monomers having unsaturated carbon-to-carbon bonds in the alkaline aqueous solution is in the range of about 0.01 to about 10 moles / liter, preferably about 0.1 to about 2 moles / liter.

In addition, the second aspect of the present invention can be implemented in the same manner as the first aspect.

According to the third aspect of the present invention, in the method for producing a polymer coating film, one or more positions selected from positions 2, 3, 5, and 6 are substituted without replacing position 4, and one or more substituents form an unsaturated carbon-to-carbon bond. Immersing the metal conductor in an alkaline aqueous solution containing a phenol derivative having; And electrolytic polymerization of the phenol derivative using a metal conductor as an electrode. This method will be described below.

In the phenol derivative in which position 4 is not substituted and at least one position selected from positions 2, 3, 5, and 6 is substituted, and one or more substituents have unsaturated carbon-to-carbon bonds, the substituent having unsaturated carbon-to-carbon bonds is not limited. Unsaturated aliphatic or aromatic hydrocarbon groups such as vinyl, allyl, propagyl, or allenyl. Other substituents having an unsaturated intercarbon bond can also be used.

Substituents of phenol derivatives having one or more substituents having unsaturated intercarbon bonds include, but are not limited to, saturated or unsaturated aliphatic hydrocarbon groups having 1 to 12 carbon atoms, or aromatic hydrocarbon groups having 6 to 12 carbon atoms; An alkoxy group; Amino group; Acyl group; Alkoxycarbonyl group; And amide groups.

As a phenol derivative in which position 4 is not substituted and at least one position selected from positions 2, 3, 5 and 6 is substituted, and at least one substituent has an unsaturated carbon-to-carbon bond, it is preferable to use the following phenol derivatives. 2-allylphenol having a substituted or unsubstituted position; 2- (1-propenyl) phenol substituted or unsubstituted at position 6; 2-vinylphenol with or without position 6 substituted; And 3-allylphenol unsubstituted or at position 6.

In an alkaline aqueous solution, the concentration of the phenol derivative having no interposition 4 and at least one position selected from positions 2, 3, 5 and 6 and at least one substituent having an unsaturated intercarbon bond is about 0.01 to about 10 mol / Liter, preferably in the range of about 0.1 to about 2 moles / liter. The concentration of the basic compound in the alkaline aqueous solution is included in a molar amount of about 0.5 to about 2 times, preferably about 0.5 to about 1.2 times the molar amounts of the phenol derivative.

Schemes of the electrolytic polymerization reaction are shown in equations 3 and 4. As shown in Equation 3, a phenol derivative having unsubstituted phenol derivatives having at least one position selected from positions 2, 3, 5 and 6 and at least one substituent having an unsaturated intercarbon bond is converted into a phenoxide ion. The phenoxide ions generate phenoxy radicals through an oxidation reaction. In Equation 4, the phenoxy radical reacts with an unsaturated intercarbon bond in the aromatic ring or substituent of the phenol derivative or the resulting polymer to advance the polymerization reaction.

The product obtained by electrolytic polymerization of a phenol derivative having at least one position selected from positions 4, 2, 3, 5, and 6, and at least one substituent having an unsaturated carbon-to-carbon bond is substituted at one or more substituents. It has a crosslinked structure by reaction of unsaturated intercarbon bond. As a result, the electrolytic solution swells and gels the polymerization reaction product. This allows the electrolytic solution to come close to the electrode even at the end of the polymerization reaction, so that the electrolytic reaction can be continued for a long time without being interrupted. Therefore, the present invention provides an insulating coating film having a thickness of several tens of micrometers which cannot be obtained by the conventional electrolytic polymerization reaction method.

Wherein R ₁ , R ₂ and R ₃ are CH ₃ -or H-. X _n represents the remainder of the substituent having an unsaturated intercarbon bond. X _m represents a substituent having no unsubstituted intercarbon bonds. In addition, p and q represent the number of each repeating unit as an integer of 1-100.

The voltage applied between the electrodes is not limited but is preferably about 0.5 to about 5 V.

In addition, the third aspect of the present invention can be implemented in the same manner as the first aspect.

According to the fourth aspect of the present invention, in the method for producing a polymer coating film, at least one position selected from positions 2, 3, 5, and 6 is substituted without substitution of position 4, and at least one substituent is unsaturated. Immersing the metal conductor in an alkaline aqueous solution containing a phenol derivative and a polymerizable monomer; And electrolytic polymerization of the phenol derivative and the polymerizable monomer using a metal conductor as an electrode. Next, this method will be described.

As a starting material, a polymerizable monomer having different properties from a phenol derivative is present in an alkaline aqueous solution containing a phenol derivative in which position 4 is not substituted and at least one position selected from positions 2, 3, 5, and 6 is substituted. The radical copolymerization reaction using phenoxy radicals generated through the electrolytic reaction can be simultaneously generated. Therefore, it is possible to change the structure and physicochemical properties of the insulating polymer coating film.

Polymerizable monomers co-existing in alkaline aqueous solution with phenol derivatives which are unsubstituted at position 4, at least one position selected from positions 2, 3, 5 and 6 and at least one substituent having an unsaturated intercarbon bond are limited But not a phenol derivative which is unsubstituted at position 4 and is substituted or unsubstituted at positions 2, 3, 5 and 6, except that it includes a substituent having an unsaturated intercarbon bond; Or a polymerizable monomer having an unsaturated intercarbon bond.

Substituents corresponding to positions 2, 3, 5, and 6 of the phenol derivative which are not substituted at the 4th position and are substituted or unsubstituted at the 2, 3, 5, and 6 positions are not limited, but 1 to 12 carbon atoms , Preferably, saturated or unsaturated aliphatic hydrocarbon groups having 1 to 7 carbon atoms, or aromatic hydrocarbon groups having 6 to 12 carbon atoms; An alkoxy group; Alkoxyalkyl group; Acyl group; Alkoxycarbonyl group; Amide group; Carbamoylalkyl groups; And hydroxyalkyl groups.

Any polymerizable monomer which can coexist in an aqueous solution in an alkaline solution can be used as the polymerizable monomer having an unsaturated intercarbon bond. Such polymerizable monomers include, but are not limited to, the following monomers having unsaturated carbon bonds: acrylamide, methacrylamide, hydroxyalkyl acrylic acid (e.g., hydroxyethyl acrylic acid). ), Hydroxyalkyl methacrylic acid (e.g. hydroxyethyl methacrylic acid), acrylic acid, methacrylic acid, polyalkylene glycol (di) acrylic acid (e.g. polyethylene glycol (di) acrylic acid), polyalkylene glycol (di Methacrylic acid (e.g. polyethylene glycol (di) methacrylic acid), dialkylaminoalkyl acrylic acid, dialkylaminoalkyl methacrylic acid, acryloyloxyalkyltrialkylammonium chloride and methacryloyloxyalkyltrialkyl chloride Ammonium is included in this. The concentration of polymerizable monomers having unsaturated intercarbon bonds in the alkaline aqueous solution is in the range of about 0.01 to about 10 moles / liter, preferably about 0.1 to about 2 moles / liter.

In addition, the fourth aspect of the present invention can be implemented in the same manner as the first aspect.

In one embodiment of the present invention, the alkaline aqueous solution is not substituted at position 4, at least one position selected from positions 2, 3, 5, and 6 is substituted, and at least one substituent is alkyl in addition to a phenol derivative having an unsaturated intercarbon bond. It contains an amine. Referring to the features of the present invention as follows.

Alkaline aqueous solutions contain alkylamines in addition to phenol derivatives having unsaturated inter-carbon bonds with one or more positions selected from positions 2, 3, 5, and 6, unsubstituted, and no longer substituted at positions 4 above. Since the alkylamine is activated on the surface of the metal conductor used as the electrode, a thicker insulating polymer coating film can be formed.

Alkylamines can be dissolved in an alkaline aqueous solution (used as an electrolytic solution), such as when a phenol derivative is substituted or unsubstituted at positions 4, 2, 3, 5 and 6 and is substituted. Amines can be used. The concentration of alkylamine in the alkaline aqueous solution is about 0.01 to about 1 mole / liter, preferably about 0.1 to about 0.6 mole / liter.

In another embodiment of the invention, a phenol derivative having no interpositions at position 4, at least one position selected from positions 2, 3, 5, and 6 and substituted at least one substituent has an unsaturated intercarbon bond is 2-allyl. Phenol, 2- (1-propenyl) phenol, or 2-allyl-6-methylphenol. Referring to this feature of the present invention.

Particularly preferably, the phenol derivative having a carbon-to-carbon bond in which position 4 is not substituted, at least one position selected from positions 2, 3, 5, and 6 and at least one substituent is not substituted is 2-allylphenol, 2 -(1-propenyl) phenol and 2-allyl-6-methylphenol. The product obtained by the electrolytic polymerization of such a phenol derivative has a well-developed crosslinked structure by reaction of unsaturated intercarbon bonds in the substituent. The effect of this crosslinked structure has been described above.

In another embodiment of the present invention, the metal conductor used in the electrolytic polymerization reaction described above may be a material whose composition comprises Cu. Referring to this feature of the present invention.

In the electrolytic polymerization reaction using phenol and ο-chlorophenol as phenol derivatives and Fe as electrode metal conductor, a polymer coating film having a thickness of up to about 10 μm was used as an ethylenediamine as a base. It is known to form (F. Bruno, MCPham, and JEDubois, Electrochimica Acta, 22, 451-457 (1977)). However, when Cu is used for the electrode metal conductor in this reaction, a Cu-ethylenediamine complex is formed and the Cu electrode elutes. Therefore, it was difficult to stably form a polymer coating film on the Cu electrode surface.

In contrast, the method according to the present invention can form a polymer coating film having a thickness of about 0.5 μm or more because the alkylamine dissolved in the alkaline aqueous solution prevents dissolution of the Cu electrode.

Metal conductors in which the composition comprises Cu include, but are not limited to, the following materials: electrolytic copper, deoxydized copper, oxygen-free copper, brass (containing Zn), non-machined brass (Zn and Pb) ), Marine brass (containing Zn and Sn), bronze (containing Sn and P), aluminum bronze (containing Al), Coleson alloy (containing Ni and Si), Husler alloy (containing Mn and Al) ), German silver (containing Zn and Ni), cupronickel (containing Ni), beryllium copper, nickel copper, silver copper, cadmium copper, and chromium copper.

The present invention is particularly useful as a method of forming an insulating polymer coating film on the surface of a metal conductor, wherein the composition contains Cu and is treated to have a flat rectangular cross section through rolling or rolling cutting.

The conventional method of coating an insulating varnish on a metal conductor and firing it to form a polymer coating film on an element having a flat rectangular cross section has a lower end insulation since the varnish is less adhered to the end face than the flat main face of the element. There is a problem in that a larger amount of varnish must be coated on the flat surface, which inevitably requires a larger amount of varnish. In contrast, in the method of the present invention, the polymer coating film is sufficiently formed on the terminal inclined surface of the metal conductor.

In one embodiment of the present invention, further comprising dipping the metal conductor (formed with a polymer coating film on the surface) following the electrolytic polymerization reaction by any one of the above methods in water, an alkaline aqueous solution except the above-described alkaline aqueous solution, or an alcoholic solution. Steps may be included. Such characteristics of the present invention are described below.

In the case of the electrolytic polymerization reaction, the polymer coating film formed after the completion of the electrolytic polymerization reaction using a phenol derivative such as a phenol derivative which is unsubstituted or substituted in positions 4, 2, 3, 5 and 6 is substituted with an electrolytic solution. It can be inflated by an alkaline aqueous solution that acts. In this case, the electrolyte in the electrolyte solution remains in the polymer coating film to reduce the insulating ability of the coating film. The insulating ability of the polymer coating film can be greatly improved by immersing the metal conductor (formed with a polymer coating film) in water, an alkaline aqueous solution except the alkaline aqueous solution described above, or an alcohol solution to remove the electrolyte.

As the liquid used for soaking as described above, water or any alkaline aqueous solution or alcohol solution which does not dissolve the polymer coating film formed on the surface of the metal conductor may be used. Examples of suitable aqueous solutions include aqueous solutions of acidic aqueous solutions (eg hydrochloric acid, sulfuric acid, nitric acid or acetic acid) and metal salts (eg sodium chloride or potassium chloride). Suitable alcohol solutions include, if necessary, acid and / or metal salts and / or other compounds with alcohols such as methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-butanol, t-butylalcohol, or ethylene glycol. ) It is prepared by dissolving in solvent.

In addition to or in place of the immersion step, the immersion may be carried out between the metal conductor and the counter electrode by an electric field of a different polarity which is not used in the electrolytic polymerization after completion of the electrolytic polymerization in order to more effectively desorb the residual ionic material in the polymer coating membrane. May be authorized.

In another embodiment of the invention, an additional step of heating the polymer coating film formed from the electrolytic polymerization reaction following the electrolytic polymerization reaction by any one of the above methods may be included. Such characteristics of the present invention are described below.

By heating the polymer coating film after the electrolytic polymerization reaction for forming the polymer coating film, the stress in the polymer coating film can be relaxed to obtain a coating film excellent in adhesion to the metal conductor. More preferably, the polymer coating film may be obtained by heating the polymer coating film to a softening point or higher temperature of the polymer constituting the polymer coating film to improve electrical insulation. It is preferable to make heating temperature about 10-100 degreeC higher than the melting point of a polymer, and to heat for about 1 to 30 minutes.

In particular, in the case of using a phenol derivative in which at least one position selected from positions 2, 3, 5, and 6 is not substituted and at least one substituent has an unsaturated intercarbon bond, The reaction between the unsaturated carbon-to-carbon bonds remaining in the polymer coating film can be improved to form a denser crosslinked structure. As a result, a polymer coating film having improved strength can be obtained.

When performing the immersion step described above, the heating step is preferably performed after the immersion step.

In another embodiment of the invention, the metal conductor is covered with an electrically insulating coating and the insulating coating comprises a defect site.

Here, the "metal conductor coated with an electrically insulating coating film" refers to an enameled wire coated with a varnish or the like and coated with an insulating coating film, or a metal conductor coated with an oxide or the like. When such an insulating coating film contains a defective site which is a weakly insulating site, conduction occurs through the defective site. When the metal conductor is immersed in an alkaline aqueous solution containing the phenol derivative described above, and the defect site is used as an electrode to cause an electrolytic polymerization reaction, an insulating coating film can be formed by forming a polymer coating film on the defect site. Application of the present invention makes it easy to selectively recover the insulating properties of conductors coated with an insulating coating film or the insulating properties of electronic components such as transformers or capacitors containing insulating defects.

In a fifth aspect of the present invention, there is provided a metal conductor coated with an insulating coating film on top of the polymer coating film using the above method for producing a polymer coating film. Next, this method will be described. According to the method for producing a polymer coating film, it is possible to form a polymer coating film having a thickness of about 10 μm or up to 100 μm on top of a conductive wire, which is a metal conductor.

In particular, the conductive wire coated with the insulating coating film formed by this method is thinner than the conductive wire coated with the insulating coating film made by varnishing and firing. When the conductive wire coated with the insulating coating film formed by this method is used as the winding of the motor, the winding density per unit volume is high, thereby improving the efficiency of the motor.

The method of making a polymer coating film according to the present invention can be applied to make a one-dimensional object such as a wire using a polymer coating film forming apparatus based on an electrolytic polymerization reaction as shown in the figure.

For example, referring to the drawing, the conductive wire 3 wound on the reel 1 is immersed in the electrolytic cell 2 through the pulley 7 and then removed. At this time, the electrolytic cell 2 contains an electrolytic solution 5 which is an alkaline aqueous solution containing a phenol derivative, a polymerizable monomer having an unsaturated carbon bond, and an alkylamine as described above.

The power supply 6 is connected to the counter electrode 4 and the pulley electrode 7 (electrically in contact with the lead 3), and the counter electrode 4 is immersed in a position not in contact with the continuous lead 3 to electrolytic polymerization. This takes place in the electrolytic cell 2. If necessary, after the electrolytic treatment, a washing bath 8 and / or a drying furnace 10 containing the washing solution 9 (for example, water or one of the above aqueous solutions) may be used. The conductive wire thus treated is wound on the reel 11 to obtain a conductive wire coated with a polymer coating film. In addition, if necessary, a cleaning and / or etching process may be performed to remove oil or oxides present on the surface of the metal lead before the electrolytic polymerization reaction for forming the polymer coating film on the metal lead (for example, the wire). It may be.

The invention will be described in more detail by examples. However, the scope of the present invention is not limited to the examples.

(Example)

(Example 1)

In an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.5 mol / liter 2,6-dimethylphenol, 0.2 mol / liter diethylamine and 0.5 mol / liter potassium hydroxide, the Cu electrode and the Pt electrode ( 5 × 60 × 0.1 mm strips each). Since the electropolymerization reaction was carried out under voltage for 1.5 minutes, the Cu electrode was maintained at a 0.5 V potential with respect to the Ag / AgCl reference electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured at 1.8 μm based on the weight.

By stacking a plurality of Cu electrodes partially coated with an insulating polymer coating thereon, the conductivity between the electrodes was measured, and the conductivity showed satisfactory insulation between the accumulated Cu electrodes.

(Example 2)

According to Example 1, a Cu electrode with an insulating coating formed thereon was placed during aging in a thermostat bath maintained at 220 ° C. for 5 minutes. Next, an aluminum coating film was formed on the polymer coating film through vapor deposition. Electrical insulation between the aluminum coating film and the naked portions of the Cu electrode (parts not coated with the above-described polymer coating film) was measured to be 1.5 × 10 ¹⁴ Ωcm.

(Example 3)

In an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.5 mol / liter of phenol, 0.2 mol / liter of hydroxymethacrylate, 0.2 mol / liter of triethylamine and 0.5 mol / liter of potassium hydroxide Cu electrodes and Pt electrodes (5 × 60 × 0.1 mm strips, respectively) were immersed. Since the electrolytic polymerization was carried out under voltage for 1.5 minutes, the Cu electrode was maintained at 0.8 V with respect to the Ag / AgCl reference electrode. The copper electrode was then removed from the solution, thoroughly washed and dried. The polymer coating film thickness formed on the electrode was measured to be 2.7 μm based on the weight.

By stacking a plurality of Cu electrodes partially coated with an insulating polymer coating on top thereof, the conductivity between the electrodes was measured, and the conductivity showed satisfactory insulation between the accumulated copper electrodes.

(Example 4)

The Cu electrode on which the polymer coating film was formed according to Example 3 was placed for 5 minutes aging in a thermostat bath maintained at 150 ° C. Next, an aluminum coating film was formed on the polymer coating film through vapor deposition. The electrical insulation between the aluminum coating film and the original part of the Cu electrode (parts not coated with the above-described polymerization coating) was measured to be 2 × 10 ¹³ Ωcm.

(Example 5)

Cu and Pt electrodes (5 × 60 × 0.1 mm strips, respectively) were dipped in an alkaline solution (water: methanol = 75: 25% by volume) consisting of 0.7 mol / liter 2-allylphenol and 0.7 mol / liter potassium hydroxide. . The electrolytic polymerization reaction was performed by applying a 3 V voltage for 20 minutes between the Cu electrode and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 0.3μm based on the weight.

(Example 6)

Cu and Pt electrodes (5 each) in an alkaline aqueous solution (water: methanol = 75:25 vol%) consisting of 0.7 mol / liter 2-allylphenol, 0.3 mol / liter diethylamine and 0.7 mol / liter potassium hydroxide X 60 x 0.1 mm strips). The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 20 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 34μm based on the weight.

(Example 7)

Cu and Pt electrodes (5 each) in an alkaline aqueous solution (water: ethanol = 75:25 vol%) consisting of 0.7 mol / liter 2-allylphenol, 0.3 mol / liter triethylamine and 0.7 mol / liter potassium hydroxide X 60 x 0.1 mm strips). The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 5 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The polymer coating thickness formed on the electrode was measured at 10 μm based on the weight.

(Example 8)

In an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.7 mol / liter 2- (2-propenyl) phenol, 0.3 mol / liter diethylamine and 0.7 mol / liter potassium hydroxide, Pt electrodes (5 × 60 × 0.1 mm strips each) were immersed. The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 20 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 25μm based on the weight.

(Example 9)

Cu electrode and Pt in an alkaline solution (water: methanol = 75: 25 vol%) consisting of 0.7 mol / liter 2-allyl-6-methylphenol, 0.3 mol / liter diethylamine and 0.7 mol / liter potassium hydroxide The electrodes (5 × 60 × 0.1 mm strips each) were immersed. The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 20 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The copper electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 30μm based on the weight.

(Example 10)

Alkaline solution consisting of 0.7 mol / liter 2-allylphenol, 0.7 mol / liter 2,6-dimethylphenol, 0.6 mol / liter diethylamine and 1.4 mol / liter potassium hydroxide (water: methanol = 75:25 Cu electrodes and Pt electrodes (5 × 60 × 0.1 mm strips, respectively) were immersed in the volume%. The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 20 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The polymeric coating thickness formed on the electrode was measured at 30 μm based on weight.

(Example 11)

Cu in an alkaline solution (water: methanol = 75:25 vol%) consisting of 0.7 mol / liter 2-allylphenol, 0.7 mol / liter phenol, 0.6 mol / liter diethylamine and 1.4 mol / liter potassium hydroxide Electrodes and Pt electrodes (5 × 60 × 0.1 mm strips, respectively) were immersed. The electrolytic polymerization reaction was carried out by applying a 3 V voltage for 20 minutes between the Cu electrode (provided as a cathode) and the Pt electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 52μm based on the weight.

(Example 12)

Using a polymer coating film forming apparatus based on an electrolytic polymerization reaction as shown in the figure, a polymer coating film was continuously formed on a Cu wire (0.1 mm in diameter). Alkali aqueous solution consisting of 0.5 mol / liter 2,6-dimethylphenol, 0.1 mol / liter hydroxyethyl methacrylate, 0.2 mol / liter diethylamine and 0.5 mol / liter potassium hydroxide (water: methanol = 75 : 25% by volume) was used as a solution in the electrolyzer (2). Since the electrolytic polymerization is carried out under voltage, the Cu wire electrode is maintained at a potential of 0.6 V with respect to the Ag / AgCl reference electrode and the Cu wire electrode passes through the electrolyzer 2 (length 10 m) at a linear velocity of 0.2 m / sec. It became. The coil was composed of Cu wire having an insulating polymer coating film formed thereon by the above method, and the coil showed satisfactory coating strength and insulation.

(Example 13)

The Cu conductors, which had a flat rectangular cross section and were cut from the copper core and polished on the rolled Cu conductors, were fired to have an average thickness of about 0.7 μm on the major flat Cu conductor faces. Since only a very small amount of polish was adhered to the end faces of the Cu conductors, it was observed that some defective parts were not covered with the polish and were not insulated. Using the polymer coating film based on the electrolytic polymerization as in Example 12, the insulation defect was selectively covered with a polymer coating film. As a result, the insulation defect site was removed on the end surface of Cu conductor wire.

(Example 14)

The enameled conductive wire (diameter 1 mm) was wound with a coil of 2 cm in diameter, and some enamel coated film was removed with sandpaper, thereby obtaining an electrode having an insulation defect site. Pt pair with an enamel coated conductor in an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.7 mol / liter 2-allylphenol, 0.3 mol / liter diethylamine and 0.7 mol / liter potassium hydroxide The electrodes (5 × 60 × 0.1 mm strips each) were immersed. The electrolytic polymerization reaction was performed by applying a 3 V voltage between the Cu electrode and the Pt electrode for 20 minutes.

Then, the Cu electrode in which the insulating coating film was selectively formed at the portion where the enamel coating film was removed was taken out of the solution. After the electrolytic polymerization reaction, the enamel-coated wire and the Pt electrode were immersed in saline, and then the conductivity between the electrodes was tested, and the conductivity showed very excellent insulation.

(Example 15)

The enamel-coated conductor (diameter 1 mm) was wound with a coil of 2 cm diameter, and some enamel coating was removed with sandpaper, thereby obtaining an electrode having insulation defects. In alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.7 mol / liter 2-allylphenol, 0.7 mol / liter phenol, 0.6 mol / liter diethylamine and 1.4 mol / liter potassium hydroxide The enamel coated conductor and Pt counter electrode according to Example 14 (part with the enamel coating removed) was immersed. Electrolytic polymerization was performed by applying a 3 V voltage between the Cu electrode and the Pt electrode for 20 minutes.

Then, the Cu electrode in which the insulating coating film was selectively formed at the portion where the enamel coating was removed was removed from the solution. After the electrolytic polymerization reaction, the enamel-coated wire and the Pt electrode were immersed in saline, and then the conductivity between the electrodes was tested, and the conductivity showed very excellent insulation.

(Example 16)

A fan motor for a vehicle ventilator, in which a conductive wire coated with enamel having an insulation defect was mixed in a coil wound part, was used as an electrode of the electrolytic polymerization reaction according to Example 16.

Motor and Pt pair electrodes (25 ×) in an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.7 mol / liter 2-allylphenol, 0.3 mol / liter diethylamine and 0.7 mol / liter potassium hydroxide 60 × 0.1 mm strips). The electrolytic polymerization reaction was performed by applying a 3 V voltage between the Cu electrode and the Pt electrode for 20 minutes. Then, the motor was removed from the solution and the motor showed that the insulating coating film was selectively formed at the defective site of the conductive wire. The nonwoven structure contained in an aqueous solution of sodium chloride and phenolphthalein was placed in the motor and voltage was applied to provide the motor as an anode. However, the phenolphthalein does not show color due to hydrogenation. Thus, it has been confirmed that the insulating coating film formed according to the embodiment of the present invention provides excellent insulation.

(Comparative Example 1)

Cu and Pt electrodes (5 × 60 × 0.1 mm strips, respectively) in an alkaline aqueous solution (water: methanol = 75: 25% by volume) consisting of 0.5 mol / liter 2,6-dimethylphenol and 0.5 mol / liter potassium hydroxide Soaked. Since the electropolymerization reaction was carried out under voltage for 1.5 minutes, the Cu electrode was maintained at a 0.5 V potential with respect to the Ag / AgCl reference electrode. The Cu electrode was then removed from the solution, thoroughly washed and dried. The thickness of the polymer coating film formed on the electrode was measured to 0.1μm based on the weight.

By stacking a plurality of Cu electrodes partially coated with an insulating polymer coating on top thereof, the conductivity between the electrodes was measured, and the conductivity did not exhibit substantial insulation between the accumulated copper electrodes.

(Comparative Example 2)

Cu and Pt electrodes (5 × 60 × 0.1, respectively) in an aqueous alkali solution (water: methanol = 75: 25% by volume) consisting of 0.5 mol / liter of phenol, 0.2 mol / liter of ethylenediamine and 0.5 mol / liter of potassium hydroxide mm strips). Since the electrolytic polymerization was performed under voltage, the Cu electrode was maintained at a 0.5 V potential with respect to the Ag / AgCl reference electrode. The Cu electrode was then removed from the solution and the Cu electrode was etched. From these results, it was estimated that the Cu-ethylenediamine complex was formed because the Cu electrode was extracted.

According to the present invention, a thin insulating coating film can be firmly formed on the metal conductor. In addition, the insulating coating film may be formed on a metal conductor such as Cu, but it is difficult to achieve the insulating coating film by a conventional electrolytic polymerization reaction. Further, according to the present invention, the insulation defect of the metal conductor coated with the insulation coating film can be easily repaired. The present invention can be used for producing a conductive wire coated with a thin insulating coating film. The wire is essential for repairing insulation defects of the coil as well as improving the performance and miniaturization of the coil.

Various other modifications can be readily utilized by those skilled in the art without departing from the scope and meaning of the invention. Accordingly, the scope of the appended claims should be limited to the description herein, which may be devised broadly.

The present invention provides a coating film comprising (1) a thin insulating coating film formed safely on top of a metal conductor, (2) an insulating coating film formed on a metal conductor such as Cu, which is difficult to obtain by a conventional electrolytic polymerization method, and (3) coated with an insulating coating film. A method of repairing insulation defects of a metal conductor and (4) a method of making a conductor coated with a thin insulating coating film is provided.

Claims (18)

A method of producing a polymer coating film, the position 4 is unsubstituted, the positions 2, 3, 5 and 6 are immersed in the alkaline aqueous solution containing a substituted or unsubstituted phenol derivative and alkylamine; And A method of producing a polymer coating film comprising the step of electrolytic polymerization of the phenol derivative using the metal conductor as an electrode. The method for producing a polymer coating film according to claim 1, wherein the composition of the metal conductor contains copper. The method of claim 1, further comprising immersing the metal conductor formed on the polymer coating film in water, an aqueous solution other than an aqueous alkali solution, or an alcohol solution following the electrolytic polymerization reaction. The method of claim 1, further comprising heating the polymer coating film generated by the electrolytic polymerization reaction. The method of producing a polymer coating film according to claim 1, wherein the insulating coating, in which the metal conductor is coated with an electrically insulating coating film including a defective part, contains the defective part. In the method for producing a polymer coating film, positions 4 and 2, 3, 5 and 6 are unsubstituted and substituted or unsubstituted phenol derivatives, polymerizable monomers having unsaturated carbon bonds, and alkylamines. Dipping the metal conductor in an alkaline aqueous solution; And Using the metal conductor as an electrode to electrolytically polymerize a polymerizable monomer having a bond between the phenol derivative and an unsaturated carbon bond. The method for producing a polymer coating film according to claim 6, wherein the composition of the metal conductor contains copper. In the method for producing a polymer coating film, position 4 is not substituted, at least one position selected from positions 2, 3, 5, and 6 is substituted, and at least one substituent includes a phenol derivative having an unsaturated intercarbon bond. Dipping the metal conductor in an alkaline aqueous solution; And A method of producing a polymer coating film comprising the step of electrolytic polymerization of the phenol derivative using the metal conductor as an electrode. The method of claim 8, wherein the alkaline aqueous solution further comprises an alkyl amine. The method of claim 8, wherein the phenol derivative is 2-allylphenol, 2- (1-propenyl) phenol or 2-allyl-6-methylphenol. The method for producing a polymer coating film according to claim 8, wherein the composition of the metal conductor contains copper. The method of claim 8, further comprising immersing the metal conductor on which the polymer coating film is formed after the electrolytic polymerization reaction in water, an aqueous solution other than an aqueous alkali solution or an alcohol solution. The method of claim 8, further comprising heating the polymer coating film formed by the electrolytic polymerization reaction following the electrolytic polymerization reaction. The method of claim 8, wherein the metal conductor is coated with an electrically insulating coating film including a defective portion. In the method for producing a polymer coating film, the 4 position is unsubstituted and at least one position selected from the 2, 3, 5 and 6 positions is substituted and includes a phenol derivative having an unsaturated intercarbon bond and / or a polymerizable monomer. Dipping the metal conductor in an alkaline aqueous solution; And Using the metal conductor as an electrode to electrolytically polymerize the phenol derivative and the polymerizable monomer. The method for producing a polymer coating film according to claim 15, wherein the composition of the metal conductor contains copper. Metal conductors; And A metal conductor coated with an insulating coating film, characterized in that it comprises a polymer coating film formed according to the method of claim 1 on part or the entire surface of the metal conductor. Metal conductors; And A metal conductor coated with an insulating coating film, comprising a polymer coating film formed according to the method of claim 8 on part or the entire surface of the metal conductor.