KR20110043330A - Nanofiller for enameled wire, nanocomposite including the same, and preparing method of the same - Google Patents

Abstract

PURPOSE: Nanofiller for enameled wire, nanocomposite including the same, and a method for preparing the same are provided to improve the partial discharging resistance property, the insulating property of the enameled wire by highly dispersing the nanofiller. CONSTITUTION: Nanofiller for enameled wire includes an inorganic oxide nanoparticle. Inorganic oxide nanoparticle is added in a solvent to obtain a mixed solution. A silane compound is added in the mixed solution and is reacted. The surface of the inorganic oxide nanoparticle is silanized. The inorganic oxide nanoparticle is selected from a group including silica, titania, alumina, zirconia, yttria, chromium oxide, zinc oxide, ferric oxide, clay, and the combination of the same.

Description

Nanofiller for enameled wire, nanocomposite material including the same, and method for manufacturing same {NANOFILLER FOR ENAMELED WIRE, NANOCOMPOSITE INCLUDING THE SAME, AND PREPARING METHOD OF THE SAME}

The present invention relates to a nanofiller for enameled wire, an organic-inorganic nanocomposite including the same, and a method for manufacturing the same, wherein the nano-filler includes inorganic oxide nanoparticles having a silanized surface, and the organic-inorganic nanocomposite Is a dispersion of the nanofiller in a varnish, and the manufacturing process of the nanofiller and the organic-inorganic nanocomposite material is carried out using an acoustic chemical method, and the nanofiller or nanocomposite material for the production of insulated wire or winding By using it, it is possible to manufacture insulated wires or windings having improved properties such as heat resistance, insulation, internal discharge resistance, and mechanical properties.

The technology for developing nanocomposite materials for high voltage materials has been established in Europe, the United States, and Japan. In the United States, in 1985, GE (General Electric) mixed the nano-sized alumina particles with polyimide by High Shear Mixing (US 4493873). In Japan, the surge resistance wire was developed by Hitachi Electric Wire in 1999 and completed the Japanese patent and registered a domestic patent [Special 2001-0082627, "Anti-discharge wire enamel composite and anti-discharge magnet wire"] and commercialized it. Applied. In the United Kingdom, Germany, and the United States, nanocomposite materials began to be combined with high voltage devices around the 2000s.

The enameled wire (or winding) used in the existing high voltage equipment has a single or two to three layers structure made of polymer material. However, the polymer material coated on the copper wire may be deteriorated by partial discharge, which adversely affects the lifespan of a high voltage electric motor. In order to overcome this, there have been attempts to increase the internal discharge and heat resistance by mixing inorganic materials with organic materials such as polymers, but flexibility and surface defects of the windings thus manufactured have become a problem.

However, if the size of the inorganic material is nm and it is well dispersed, it is known that the flexibility of the windings can be improved in various properties without a significant drop. When the degree of dispersion of the inorganic nanoparticles in the polymer matrix and the improvement of the heat resistance of the material including the same are verified, they are known to have internal discharge characteristics and to increase the lifespan in a state where partial discharge is applied.

The addition of oxide nanoparticles leads to the improvement of electrical and physical properties as described above, but it is essential to disperse the nanoparticles in the polymer medium as a prerequisite. If the nanoparticles are not well dispersed, aggregation of the particles may occur excessively to obtain desired characteristics. On the other hand, if the nanoparticles are well dispersed, the total number of individual particles actually acting increases, so that the amount of particles added may be better than at least poorly dispersed. Furthermore, as the amount of filler added increases, the heat resistance and resistance to partial discharge increase, but since the breakability of the enamel layer increases, it is more advantageous that the addition amount of the inorganic filler is small. Therefore, as the dispersibility is increased, the use of a small amount of nanofiller becomes possible, and the improvement of properties can be effectively achieved without increasing the breakability of the enamel layer surrounding the conductor.

The success of the nanoparticle dispersion can be judged primarily by the transparency of the medium or substrate (substrate) in which the nanoparticles are inserted. This is because the added nanoparticles do not move individually, but because of the interparticle interactions and the interaction between the particles and the medium, the nanoparticles aggregate together to form one large cluster. If the size of the cluster is 1/4 or more (100 nm) of the visible light region (400 to 700 nm), the scattering intensity of light increases and transparency decreases rapidly. Preferably, it should have a size of 50 nm or less. However, it is not easy to make the size of the cluster by 50 nm or less due to the aggregation of particles.

So many studies have chosen the mechanical method of conventional ball-milling [US Patent 6403890] or High shear mixing [US Patent 4493873], or stirring without any treatment, for the dispersion of nanoparticles. Or [US Patent 6180888], Sol-gel method (Japanese Patent Laid-Open No. 200336731 (P200336731A)) was used to prepare an enameled wire in which nanoparticles are dispersed. However, all three of these methods have disadvantages. The mechanical method is the first method, and there is no interfacial bonding between the oxide nanoparticles and the organic matrix, and it is easy to generate cracks on the surface by lowering the flexibility of the enamel matrix. The stirring method tends to lower the enamel matrix flexibility and the like, it is difficult to add nanoparticles at high concentration, and the dispersion degree is not good, which adversely affects the quality uniformity of the enamel layer. The sol-gel method has excellent dispersibility in the enamel layer, but the dielectric strength decreases due to unreacted materials when generating nanoparticles, and excessive increase of heat treatment process time during manufacturing due to the nature of the sol-gel process There is a disadvantage in that the manufacturing price rises because of.

 The present inventors have conducted various studies on a technique for producing enameled wires having extremely improved properties such as heat resistance, insulation, partial discharge, and the like using organic-inorganic nanocomposites. According to the research of the present inventors, a nanofiller including nano-sized oxide fine particles surface-treated with silane is prepared, and the nanofiller is highly dispersed to obtain an organic-inorganic nanocomposite material for enameled wire, thereby providing heat resistance, insulation, and heat resistance. It has been found that enameled wire can be produced with very improved properties such as partial discharge.

The organic-inorganic nanocomposite material for the enameled wire including the nanofiller for the enamelled wire is obtained by dispersing the nanofiller including nano-sized oxide fine particles surface-treated with the silane in a varnish, and the process for producing them is an acoustic chemical method. It is carried out using, and by coating the organic-inorganic nanocomposite material on the surface of the conductive wire it can be produced an enamel wire with excellent properties such as heat resistance, insulation, internal discharge and discharge, surface uniformity, flexibility.

However, the problem to be solved by the present invention is not limited to the above-mentioned problem, another task that is not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, an aspect of the present invention, by adding an inorganic oxide nanoparticles in a solvent to form a mixed solution; Provided is a method for producing an encapsulated nanofiller for silencing the surface of the inorganic oxide nanoparticles by adding and reacting a silane compound with the mixed solution.

Another aspect of the present invention provides a liquid mixture by adding inorganic oxide nanoparticles in a solvent; Adding a silane compound to the mixture and reacting to silanize the surface of the inorganic oxide nanoparticle to obtain a nanofiller including silanized inorganic oxide nanoparticles on the surface; Provided is a method for producing an organic-inorganic nanocomposite material for enameled wire, which comprises mixing and dispersing the obtained nanofiller with a varnish to obtain an organic-inorganic nanocomposite material.

Another aspect of the invention provides a nanofiller for enameled wire, the surface comprising silanized inorganic oxide nanoparticles.

Another aspect of the present invention provides an organic-inorganic nanocomposite material for enamel wire, wherein the surface comprises a varnish in which a nanofiller containing silanized inorganic oxide nanoparticles is dispersed.

Another aspect of the present invention is an insulated wire having an conductive wire and an enamel insulating film covering the surface thereof, wherein the enamel insulating film contains an organic-inorganic nanocomposite material for enamel wire as described above. To provide.

According to the present invention, it is possible to obtain a nanofiller comprising nano-sized inorganic oxide fine particles surface-treated with silane, and an organic-inorganic nanocomposite material for enameled wire in which the nanofiller is highly dispersed.

When the winding is manufactured using the organic-inorganic nanocomposite material, an enameled wire having much improved properties such as heat resistance, insulation, partial discharge, and the like, compared to a winding manufactured using a composition (varnish) containing only a conventional polymer, may be manufactured. have.

DETAILED DESCRIPTION Hereinafter, embodiments and embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention.

As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

One aspect of the invention, by adding the inorganic oxide nanoparticles in a solvent to form a mixed solution; Provided is a method for producing an encapsulated nanofiller for silencing the surface of the inorganic oxide nanoparticles by adding and reacting a silane compound with the mixed solution.

Another aspect of the present invention provides a liquid mixture by adding inorganic oxide nanoparticles in a solvent; Adding a silane compound to the mixture and reacting to silanize the surface of the inorganic oxide nanoparticle to obtain a nanofiller including silanized inorganic oxide nanoparticles on the surface; Provided is a method for producing an organic-inorganic nanocomposite material for enamel wire, which comprises mixing and dispersing the obtained nanofiller with a varnish to obtain a nanocomposite material.

As a non-limiting example of the solvent, the group consisting of toluene, xylene, ethanol, methanol, cresol, water, acetone, cyclohexane, DMF (N, N-Dimethylformamide) and N-methyl pyrolidone (N-methyl pyrolidone) It may include one or more selected from.

Non-limiting examples of the inorganic oxide nanoparticles may include one or more selected from the group consisting of silica, titania, alumina, zirconia, yttria, chromium oxide, zinc oxide, iron oxide and clay. For example, the inorganic oxide nanoparticles may be 4 to 100 nanometers in size, but are not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles comprise silica, the silica may be fumed silica, and may be silica nanoparticles or colloidal silica prepared by the sol-gel method. However, it is not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles include titania (TiO ₂ ), the titania may be fumed titania, or titania prepared by the sol-gel method. However, it is not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles are alumina, the alumina may be fumed alumina, but is not limited thereto.

In an exemplary embodiment of the present invention, the nano-filler for the enameled wire is added to the inorganic oxide nanoparticles in a mixed solution containing an organic solvent and silane and reacted, if necessary, the inorganic oxide using an acoustic chemical or other method The nanoparticle surface and the silane may be reacted to obtain a powder, gel, or liquid nanofiller.

In an exemplary embodiment, the varnish for enameled wire is polyester, polyesterimide, THEIC (tri (2-hydroxyethyl) isocyanuate triacrylate) -polyesterimide, polyamide, polyamideimide, It may include one or more selected from the group consisting of polyimide, polyurethane and polyvinyl formal, but is not limited thereto.

In an exemplary embodiment, the solvent is toluene, xylene, ethanol, methanol, cresol, water, acetone, cyclohexane, N, N-Dimethylformamide (DMF) and N-methyl pyrolidone It may include one or more selected from the group consisting of, but is not limited thereto.

Another aspect of the invention provides a nanofiller for enameled wire, wherein the surface comprises silanized inorganic oxide nanoparticles.

Another aspect of the present invention provides an organic-inorganic nanocomposite material for enamel wire, wherein the surface comprises a varnish in which a nanofiller containing silanized inorganic oxide nanoparticles is dispersed.

Non-limiting examples of the inorganic oxide nanoparticles may include one or more selected from the group consisting of silica, titania, alumina, zirconia, yttria, chromium oxide, zinc oxide, iron oxide and clay. For example, the inorganic oxide nanoparticles may have a particle diameter of 100 nanometers or less, and may be, for example, 4 to 100 nanometers in size, but are not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles comprise silica, the silica may be fumed silica, and may be silica nanoparticles or colloidal silica prepared by the sol-gel method. However, it is not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles include titania (TiO ₂ ), the titania may be fumed titania, or titania yl prepared by the sol-gel method. May be, but is not limited thereto.

In an exemplary embodiment of the present invention, when the inorganic oxide nanoparticles are alumina, the alumina may be fumed alumina, but is not limited thereto.

In an exemplary embodiment of the present invention, the nanofiller for the enameled wire may be powder, gel, or liquid.

In an exemplary embodiment, the varnish for enameled wire is polyester, polyesterimide, THEIC (tri (2-hydroxyethyl) isocyanuate triacrylate) -polyesterimide, polyamide, polyamideimide, It may include one or more selected from the group consisting of polyimide, polyurethane and polyvinyl formal, but is not limited thereto.

Another aspect of the present invention is an insulated wire having an lead wire and an enamel insulating coating covering the surface thereof, wherein the enamel insulating coating comprises an organic-inorganic nanocomposite material for enamel wire of claim 12. winding wire).

Hereinafter, the present invention will be described in more detail.

When the silane is bonded to the surface of the silica particles which are inorganic oxide nanoparticles, it may be performed sonochemically, and specifically, ultrasonic waves may be used. It may also be made in a high temperature reactor comprising reflux and flask. However, it is more preferable to use an acoustic chemical method to maximize the dispersion effect on the nanoparticles by effectively controlling the surface density of the silane reacting with the OH group present on the silica surface. The time that the silane binds to the surface of the silica nanoparticles may be from 5 minutes to 4 days, but is not limited thereto.

The silane compound may be used as the following Table 1, but is not limited thereto. The functional groups included in the silane compound may include one or more of amine groups, aniline groups, epoxy groups, phenyl groups, vinyl groups, and hydrocarbon groups, but are not limited thereto.

In an exemplary embodiment, the silanes that can be used are not limited to Table 1 above, and the silanes may be used in a single or more composition. The silica particles surface-treated with the silane may be a solid (powder), a sol, a gel, or a liquid mixture dispersed in a solvent phase.

In an exemplary embodiment, the organic-inorganic nanocomposite material for the enameled wire may include inorganic oxide nanoparticles in a ratio of 1 to 100 by weight when the resin included in the varnish is 100. In the case of including nano-sized inorganic oxide particles, it may preferably comprise 1 to 10 weight ratio.

In an exemplary embodiment, mixing the nanofiller with a varnish to disperse the inorganic oxide nanoparticles in the varnish to form an organic-inorganic nanocomposite may include dissolving the nanofiller in a thinner to disperse the varnish. Can be. And forming the nanocomposite by mixing the silica with the varnish and dispersing the silica in the varnish with the varnish may include the use of a sonochemical method, specifically an ultrasonic method. have.

The organic-inorganic nanocomposite material for the enameled wire is, for example, after dissolving the silica surface-treated with silane by the above-described manufacturing method in the varnish, through the centrifugation process to remove impurities, silica fine dispersion polyester A varnish can be obtained, and the organic-inorganic nanocomposite film is coated by conducting a heat treatment process (coating process) by coating the conductor including a conductor selected from the group consisting of copper, aluminum, nickel, gold, silver and combinations thereof. Insulated wires or windings can be completed.

1 is a cross-sectional view of a winding according to an embodiment of the present invention, using an organic-inorganic nanocomposite to which a nanofiller including inorganic nanoparticles having a silanized surface as an insulating coating material is added, and a single coating type ( Single-coated type). Conductor 100 is a conductor including a material selected from the group consisting of copper, aluminum, nickel, gold, silver, and combinations thereof, and insulating film 101 is an inorganic silanized surface according to an embodiment of the present invention. The nano-filler containing the nanoparticles may include an organic-inorganic nanocomposite material for the enameled wire. Lubricating coating layer 102 is a layer formed by coating wax or the like to reduce the friction between the windings.

How to Surface Treat Silanes on Silica

In an exemplary embodiment, a method of surface treating silane on silica and a method of preparing an organic-inorganic nanocomposite material using the same, refer to FIG. 2. First, toluene can be placed in a glass bottle and mixed with silica to form a mixed solution. The bottle containing the mixed solution may be placed in a sonicator for a while in an ultrasonic environment at a temperature of 85 ° C. to disperse the silica in toluene to some extent. To this may be administered a silane of a specific composition. The temperature and ultrasonic conditions can then be maintained as they are. However, temperature, dosing conditions, and ultrasonic environment are not limited to those described above.

[3- [2- (2-aminoethylamino) ethylamino] propyltrimethoxysilane), N- [3- ( Silica treated with trimethoxysilyl) propyl] ethylenediamine (N- [3- (trimethoxysilyl) propyl] ethylenediamine) and (3-aminopropyl) trimethoxysilane] It shows good solubility, and phenyl series silane [trimethoxyphenylsilane] can show the best solubility in xylene and toluene. In addition, aniline-based [N- [3- (trimethoxysilyl) propyl] aniline (N- [3- (trimethoxysilyl) propyl] aniline)] shows the best solubility in xylene and toluene but is soluble in most solvents. It can also be dissolved in cresols. Silanes having a functional group such as silane having a hydrocarbon functional group, epoxy, methacrylate, vinyl, or the like may also be used.

Surface-treated silica is dispersed in the liquid phase immediately after synthesis, but may require a process for removing unreacted materials and impurities. The surface treated silica can be present in solid, liquid, or gel form.

In order to obtain the surface-treated silica in the form of a powder, precipitation may be performed by mixing an appropriate amount of a non-solvent according to the type of the prepared mixture, and filtered to obtain a pure silane-surface treated silica particle solid.

In order to obtain the surface-treated silica in liquid form, the silica mixed solution prepared on the solvent may be used as it is, and the above-described powder may be dissolved and used in a solvent suitable for the functional group of the surface-treated silane.

In order to obtain the surface-treated silica in the form of a gel, the prepared mixture may be used as it is, or a small amount of non-solvent may be mixed with the prepared mixture and then filtered to obtain a surface-treated silica gel.

Method for manufacturing organic-inorganic nanocomposite material for enameled wire

In an exemplary embodiment, the silica surface-treated with the silane described above is in the form of a solid (powder), liquid, or gel, so several methods can be used to mix it with the polyester varnish.

First, in the solid phase, the surface-treated silica is directly dissolved in the varnish or dissolved in the varnish thinner (mixed with m-cresolic acid and xylene) and mixed with the varnish as desired, followed by centrifugation or filtration. Impurities such as silica particles and dust that have been reaggregated through the process can be removed to form varnishes for organic-inorganic nanocomposites.

Second, in the case of liquid phase, the surface-treated silica can be mixed with the varnish. The solvent in which silica is dissolved may be toluene, xylene, alcohol, acetone, cresol, but when mixing varnish, xylene, cresol and a mixed solution including the main solvent are preferable. The mixture of the mixed solution and the varnish may be removed by centrifugation or filtration to remove impurities such as silica particles and dust that have been reaggregated to form varnishes for nanocomposites.

Third, in the case of the gel form, when the silica is mixed in the varnish, the gel in the form of the silica directly into the varnish can be dispersed by applying an ultrasonic wave or the gel may be dissolved in the thinner and mixed with the varnish. The varnish containing the nano-silica thus obtained may be removed by centrifugation or filtration to remove impurities such as reaggregated silica particles and dust to form a varnish for nanocomposites.

In the dispersion of the organic-inorganic nanocomposites according to the present invention, as an analytical method, dispersion of the nanocomposites using TEM, SEM / EDS, AFM, DSC, Raman spectroscopy, ultraviolet-visible absorption spectroscopy, neutron scattering spectroscopy, etc. You can analyze the degree, etc.

In the improvement of the properties of the organic-inorganic nanocomposite material according to the present invention, KS C 3006, 3107 and the like as the analysis method. AFM, TGA, DSC and the like can also be used to analyze the improvement of properties.

Hereinafter, the present invention will be described in more detail with reference to exemplary embodiments. However, the present invention is not limited to these embodiments.

Example 1 Dispersion of Silica Surface-treated with Tri-aminesilane (3- [2- (2-aminoethylamino) ethylamino] propyltrimethoxysilane)

600 ml of toluene and 12 g of silica were put in a 1 L glass bottle, and ultrasonic waves were applied for 30 minutes at a temperature of 85 ° C. in an ultrasonic wave to form a mixed solution. Subsequently, 8 ml of 3- [2- (2-aminoethylamino) ethylamino] propyltrimethoxysilane [3- [2- (2-amino ethylamino) ethylamino] propyltrimethoxysilane] was added to the mixed solution. After adding 8 ml of methoxytrimethoxysilane (Methoxytrimethylsilane) was subjected to silane treatment on the silica surface while applying ultrasonic waves at 85 ℃ for 3 days.

200 ml of alcohol was added to the 600 ml mixture, and then poured into a glass filter funnel having a constant pore size (10 to 16 µm). The process was repeated three more times to produce a powder and to soak the alcohol to remove the unreacted material to obtain a powder.

Ultrasonic waves and heat were added so that the weight ratio of the powder was 20.5 (wt%), and then dissolved in a polyester varnish thinner to form a silica-thinner solution. The silica-thinner solution was mixed by applying ultrasonic waves at room temperature in a weight ratio of 1/11 to the polyester varnish. In this way, a nano composite varnish having a silica content of 5 (wt%) in the total solids including silica and a polyester prepolymer was prepared. Nano composite varnish having a smaller silica weight ratio was used by further diluting a high concentration of silica-thinner solution.

The results of the above experiment refer to the first bottle and FIG. 4 on the left side of FIG. 3. Referring to Figures 3 and 4, it can be seen that a perfect dispersion is achieved because all of the transparent particles without reaggregation of nanoparticles up to 5 weight ratio. This result means that when the coating and heat treatment to the actual conductor, it is possible to effectively improve the characteristics such as heat resistance, insulation, internal discharge and discharge resistance by the inorganic filler.

Example 2 Dispersion of Silica Treated with Di-amine Silane (N- [3- (trimethoxy silyl) propyl] ethylenediamine) in Polyester Varnishes

600 ml of toluene and 12 g of silica were put in a 1 L glass bottle, and ultrasonic waves were applied for 30 minutes at a temperature of 85 ° C. in an ultrasonic wave to form a mixed solution. Then, 8 ml of N- [3- (trimethoxysilyl) propyl] ethylenediamine (N- [3- (trimethoxysilyl) propyl] ethylenediamine) was added to the mixed solution. After 3 hours, 8 ml of methoxytrimethoxysilane was added. After the addition, the silica surface was treated with silane while applying ultrasonic waves at 85 ° C. for 3 days.

200 ml of alcohol was added to the 600 ml mixture, and then mixed into a glass filter funnel having a constant pore size (10 to 16 µm). The process was repeated three more times to produce a powder and to soak the alcohol to remove the unreacted material to obtain a powder.

Ultrasonic waves and heat were added so that the weight ratio of the powder was 20.5 (wt%), and then dissolved in a polyester varnish thinner to form a silica-thinner solution. The silica-thinner solution was mixed by applying ultrasonic waves at room temperature in a weight ratio of 1/11 to the polyester varnish. In this manner, a nano composite varnish having a silica content of 5 in the total solid content including silica and a polyester prepolymer was prepared. Nano composite varnish having a smaller silica weight ratio was used by further diluting a high concentration of silica-thinner solution.

The results of the above experiment refer to the second bottle from the left side of FIG. 3 and FIG. 5. Referring to Figures 3 and 5, it can be seen that a perfect dispersion is achieved because all of the transparent particles without reaggregation of nanoparticles up to 5 weight ratio. This result means that when coated with an actual conductor and heat-treated, it is possible to effectively improve characteristics such as heat resistance, insulation, and internal discharge resistance by the inorganic filler.

Example 3 Dispersion of Silica Treated with Vinyl-benzyl-di-amine Silane [(N- [3- (trimethoxysilyl) propyl] -n '-(4-vinylbenzyl) ethylenediamine)] in Polyester Varnish

600 ml of toluene and 12 g of silica were put in a 1 L glass bottle, and ultrasonic waves were applied for 30 minutes at a temperature of 85 ° C. in an ultrasonic wave to form a mixed solution. Subsequently, N- [3- (trimethoxysilyl) propyl] -n '-(4-vinylben) ethylenediamine [N- [3- (trimethoxysilyl) propyl]-diluted in a weight ratio of 40 wt. 22 ml of n '-(4-vinylbenzyl) ethylenediamine] was added, and after 3 hours, 8 ml of methoxytrimethoxysilane was added, and the silane treatment was performed on the silica surface while applying ultrasonic waves at 85 ° C. for 3 days.

200 ml of alcohol was added to the 600 ml mixture, and then mixed into a glass filter funnel having a constant pore size (10 to 16 µm). The process was repeated three more times to produce a powder and to soak the alcohol to remove the unreacted material to obtain a powder. Ultrasonic waves and heat were added so that the weight ratio of the powder was 20.5 (wt%), and dissolved in a polyester varnish thinner to form a silica-thinner solution. The silica-thinner solution was mixed by applying ultrasonic waves at room temperature in a weight ratio of 1/11 to the polyester varnish. In this manner, a nano composite varnish having a silica content of 5 in the total solid content including silica and a polyester prepolymer was prepared. Nano composite varnish having a smaller silica weight ratio was used by further diluting a high concentration of silica-thinner solution.

The results of the above experiment can refer to the third bottle and FIG. 6 from the left side of FIG. 3. 3 and 6, it can be seen that up to 5 weight ratios are all transparent without reaggregation of nanoparticles, thereby achieving perfect dispersion. This result means that when the coating and heat treatment to the actual conductor, it is possible to effectively improve the characteristics such as heat resistance, insulation, internal discharge and discharge resistance by the inorganic filler.

Example 4 Dispersion of Silica Treated with Aniline Silane [N- [3- (trimethoxysilyl) propyl] aniline] in Polyester Varnishes

600 ml of toluene and 12 g of silica were put in a 1 L glass bottle, and ultrasonic waves were applied for 30 minutes at a temperature of 85 ° C. in an ultrasonic wave to form a mixed solution. Thereafter, 8 ml of N- [3- (trimethoxysilyl) propyl] aniline (N- [3- (trimethoxysilyl) propyl] aniline) was added to the mixed solution, and 3 hours later, 8 ml of methoxytrimethoxysilane was added thereto. After silane treatment on the surface of silica while applying an ultrasonic wave at 85 ℃ for 3 days.

200 ml of alcohol was added to the 600 ml mixture, and then mixed into a glass filter funnel having a constant pore size (10 to 16 µm). The process was repeated three more times to produce a powder and to soak the alcohol to remove the unreacted material to obtain a powder.

Ultrasonic waves and heat were added so that the weight ratio of the powder was 20.5 (wt%), and dissolved in a polyester varnish thinner to form a silica-thinner solution. The silica-thinner solution was mixed by applying ultrasonic waves at room temperature in a weight ratio of 1/11 to the polyester varnish. In this manner, a nano composite varnish having a silica content of 5 in the total solid content including silica and a polyester prepolymer was prepared. Nano composite varnish having a smaller silica weight ratio was used by further diluting a high concentration of silica-thinner solution.

The results of the above experiment refer to the fourth bottle from the left of FIG. 3 and FIG. 7. Referring to FIGS. 3 and 7, it can be seen that perfect dispersion is achieved since all are transparent without reaggregation of the nanoparticles up to 5 weight ratio. This result means that when the coating and heat treatment to the actual conductor, it is possible to effectively improve the characteristics such as heat resistance, insulation, internal discharge and discharge resistance by the inorganic filler.

Example 5: Polyester enameled wire formed using silica obtained by treating aniline silane and organic-inorganic nanocomposite material using the same

600 ml of toluene and 12 g of silica were put in a 1 L glass bottle, and ultrasonic waves were applied for 30 minutes at a temperature of 85 ° C. in an ultrasonic wave to form a mixed solution. Subsequently, 8 ml of N- [3- (trimethoxysilyl) propyl] aniline was added, and after 3 hours, 8 ml of methoxytrimethoxysilane was added, followed by ultrasonication at 85 ° C. for 3 days, and then the silane on the silica surface. Treatment was carried out.

200 ml of alcohol was added to the 600 ml mixture, and then mixed into a glass filter funnel having a constant pore size (10 to 16 μm). The process was repeated three more times to produce a powder and to soak the alcohol to remove the unreacted material to obtain a powder.

90 g of this powder was dissolved in 900 ml of enameled wire varnish dilution thinner (product formed with 70% m-cresolic acid and 30 parts of xylene in accordance with KS C 2321 standard) at an ultrasonic temperature of 85 degrees. 4900 ml of mixed liquor was produced by mixing with 4000 ml of polyester varnish having a polyester weight ratio of 40%. Its silica content ratio was about 3.7 wt%. Next, after centrifugation at 20,000 rpm for 30 minutes in a centrifuge, only the supernatant was taken to complete the polyester varnish containing nanosilica.

Finally, the varnish was coated on a copper wire having a thickness of 1.0 mm and heat-treated to prepare an enameled wire coated with an organic-inorganic nanocomposite material.

As a result, the thermal shock test conducted in accordance with KS C 3006 is attached below. In the following, Company D refers to the Korean Front.

※ The number of cracks on the surface was calculated based on the number of windings.

※ In the division, x means the multiple of the core thickness located at the center when winding the coil.

※ Heat resistance standard of company D's enameled wire is Class F (155 ℃).

According to the above Table 2, it can be seen that the nanocomposite PEW using the silica varnish undispersed polyester varnish is superior in the thermal shock resistance than the existing product using only the polyester varnish (PE D company).

Table 3 below is the data obtained by performing an enameled wire test on the basis of KS standards. The first to fourth order refers to the order of implementation of the PEW winding prototype using the nanocomposite material according to the embodiment of the present invention, which is in accordance with the change of the heat treatment process conditions.

As mentioned above, the present invention has been described in detail by way of examples, but the present invention is not limited to the above embodiments, and may be modified in various forms, and within the technical spirit of the present invention, there is a general knowledge in the art. It is obvious that many variations are possible by the possessor.

1 is a cross-sectional view of an insulated wire using an organic-inorganic nanocomposite material for an enamel wire according to an embodiment of the present invention.

Figure 2 shows a method for producing a nanofiller and nanocomposite for enamel wire according to an embodiment of the present invention.

Figure 3 is a photograph showing a silica / thinner mixed solution mainly treated with each of the four amine group silane dissolved in high concentration (20.5wt%) according to an embodiment of the present invention.

FIG. 4 shows silica treated with tri-amine silane (3- [2- (2-aminoethylamino) ethylamino] propyltrimethoxysilane) according to an embodiment of the present invention. And organic-inorganic nanocomposites added at a weight ratio of 3, 4 and 5.

FIG. 5 shows silica treated with di-amine silane (N- [3- (trimethoxysilyl) propyl] ethylenediamine) according to an embodiment of the present invention in polyester varnishes 0, 1, 2, 3, 4, The organic-inorganic nanocomposite material added at the weight ratio of 5 is shown.

FIG. 6 shows silica treated with vinyl-benzyl-di-amine silane (N- [3- (trimethoxysilyl) propyl] -n '-(4-vinylbenzyl) ethylenediamine) according to an embodiment of the invention. The organic-inorganic nanocomposite material added at the weight ratio of 0, 1, 2, 3, 4, 5 to a polyester varnish is shown.

7 is a weight ratio of 0, 1, 2, 3, 4, 5 to a polyester varnish of silica treated with aniline silane (N- [3- (trimethoxysilyl) propyl] aniline) according to an embodiment of the present invention. The organic-inorganic nanocomposites added respectively are shown.

Claims (18)

As a manufacturing method of the nanofiller for enamel wires whose surface contains the silanized inorganic oxide nanoparticles, Adding inorganic oxide nanoparticles in a solvent to form a mixed solution; Silane the surface of the said inorganic oxide nanoparticle by adding and reacting a silane compound to the said mixed liquid: The manufacturing method of the nanopillar for enamel wires containing. The method of claim 1, The solvent is from the group consisting of toluene, xylene, ethanol, methanol, cresol, water, acetone, cyclohexane, N, N-dimethylformamide (DMF), N-methyl pyrolidone and combinations thereof The manufacturing method of the nanofiller for enamel wires containing what is selected. The method of claim 1, The nanofiller is a solid, liquid, or gel state, a method for producing an enamel wire nanofiller. The method of claim 1, Silane the surface of the said inorganic oxide nanoparticle by adding and reacting a silane compound to the said mixed liquid includes using the sonochemical method, The manufacturing method of the nanofiller for enamel wires. The method of claim 4 The acoustic chemical method is a method comprising the ultrasonic treatment, a method of producing a nanofiller for enameled wire. The method of claim 1, The inorganic oxide nanoparticles are prepared from the group consisting of silica, titania, alumina, zirconia, yttria, chromium oxide, zinc oxide, iron oxide, clay and combinations thereof, the production of nanofillers for enameled wire Way. A method for producing an organic-inorganic nanocomposite material by dispersing by mixing a varnish with a varnish of a nanofiller for an enamelled wire comprising an inorganic oxide nanoparticle having a silanized surface prepared according to any one of claims 1 to 6 Including, Manufacturing method of organic-inorganic nanocomposite material for enameled wire. The method of claim 7, wherein The varnish is polyester, polyesterimide, THEIC (tri (2-hydroxyethyl) isocyanuate triacrylate) -polyesterimide, polyamide, polyamideimide, polyimide, polyurethane, polyvinyl formal And What is selected from the group which consists of these combinations, The manufacturing method of the organic-inorganic nanocomposite material for enamel wires. The method of claim 7, wherein Mixing the nanofiller with the varnish to disperse the inorganic oxide nanoparticles in the varnish to obtain a nanocomposite material comprises using a sonochemical method, the method for producing an organic-inorganic nanocomposite material for enameled wire. The method of claim 9, The acoustic chemical method is a method of producing an organic-inorganic nanocomposite material for enamel wire, which is a method comprising the ultrasonic treatment. The method of claim 7, wherein The method for producing an organic-inorganic nanocomposite material for enameled wire, further comprising removing impurities through the obtained organic-inorganic nanocomposite material through a centrifugal separation process. The method for producing an organic-inorganic nanocomposite material for enamel wire according to claim 7, comprising dissolving the nanofiller in a thinner and dispersing the varnish in a varnish. The nanofiller for enameled wire which contains the silanized inorganic oxide nanoparticles manufactured by the manufacturing method in any one of Claims 1-6. An organic-inorganic nanocomposite material for enameled wire, wherein the surface according to claim 13 comprises a varnish in which the nanofiller for enamelled wire containing inorganic oxide nanoparticles silanized is dispersed. The method of claim 14, The varnishes are polyester, polyesterimide, THEIC (tri (2-hydroxyethyl) isocyanuate triacrylate) -polyesterimide, polyamide, polyamideimide, polyimide, polyurethane and polyvinyl formal An organic-inorganic nanocomposite material for enameled wire, comprising at least one selected from the group consisting of: The organic-inorganic nanocomposite material for enameled wire according to claim 14, wherein the nanofiller is in a solid state, a liquid state, or a gel state. An enameled wire having an enamel insulating coating covering a conductive wire and the surface thereof, wherein the enamel insulating coating comprises an organic-inorganic nanocomposite material for the enameled wire of claim 14. A winding having a conductive wire and an enamel insulating coating covering the surface thereof, wherein the enamel insulating coating comprises an organic-inorganic nanocomposite material for enamel wire according to claim 14.

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