TW202202585A - Self-bonding coated electrical steel sheet, laminated core, and method for producing the same - Google Patents

Abstract

The present invention relates to a self-bonding coated electrical steel sheet, a laminated core, and a method for producing the same. At a specific baking temperature, by specific compositions and a baked coating film with a specific thickness, the self-bonding coated electrical steel sheet made by using the same has an appropriate kinetic coefficient of friction, an appropriate arithmetical mean roughness in height, and a good electrical insulation. Furthermore, at a specific bonding temperature, the laminated core made by using the previous self-bonding coated electrical steel sheets has a good bonding strength at room temperature.

Description

Self-adhesive coated electromagnetic steel sheet, laminated iron core and manufacturing method thereof

The present invention relates to a self-adhesive coating-film electromagnetic steel sheet, a laminated iron core and a manufacturing method thereof, and in particular, to a kind of self-adhesive coating film electromagnetic steel sheet, a laminated iron core and a manufacturing method thereof, and in particular to a kind of a kind of self-adhesive coating film electromagnetic steel sheet, which can provide a suitable kinetic coefficient of friction (COF _k ) and an arithmetic mean height roughness ( Arithmetic mean roughness in height, _Ra and self-adhesive coated electromagnetic steel sheet with good insulation and laminated iron core with good bonding strength at room temperature, and a manufacturing method thereof.

Electromagnetic steel sheets are used in the laminated cores of generators, transformers and motors. Traditionally, a plurality of electromagnetic steel sheets are assembled into a laminated core by welding or riveting. However, the aforementioned welding method has the problems of short circuit at the edges of the laminated iron core and the decrease of the interlayer insulation, and the aforementioned riveting method has the problem of insufficient bonding strength of the laminated iron core. Therefore, a self-adhesive coating electromagnetic steel sheet bonding method is developed to solve the problems caused by welding and riveting.

Although the bonding method of self-adhesive coated electromagnetic steel sheet can avoid the disadvantages caused by welding and riveting methods, the manufacturing process of self-adhesive coated electromagnetic steel sheet may produce inappropriate kinetic friction coefficient and roughness. , and the poor insulation of the coated electromagnetic steel sheet, which will reduce the bonding strength of the laminated core. In addition, in the bonding step of the self-adhesive coated electromagnetic steel sheet, improper bonding conditions will also lead to poor bonding strength of the laminated iron core.

In view of this, there is an urgent need to develop a new self-adhesive coated electromagnetic steel sheet, a laminated iron core and a manufacturing method thereof to improve the above shortcomings.

In order to solve the above problems, one aspect of the present invention provides a method for manufacturing a self-adhesive coated electromagnetic steel sheet. The self-adhesive coated electromagnetic steel sheet made from the baked coating film of specific composition and specific thickness has an appropriate coefficient of kinetic friction.

Another aspect of the present invention provides a self-adhesive coated electromagnetic steel sheet. The self-adhesive coated electromagnetic steel sheet is produced by the above-mentioned manufacturing method of the self-adhesive coated electromagnetic steel sheet, and has an appropriate arithmetic mean height roughness.

Yet another aspect of the present invention provides a method for manufacturing a laminated core. The manufacturing method of the laminated iron core is to use a plurality of the aforementioned self-adhesive coated electromagnetic steel sheets at a specific bonding temperature to prepare the laminated iron core.

Yet another aspect of the present invention provides a laminated iron core. The laminated iron core is produced by the above-mentioned manufacturing method of the laminated iron core, and has good bonding strength at room temperature.

According to an aspect of the present invention, a method for manufacturing a self-adhesive coated electromagnetic steel sheet is provided. In the manufacturing method of the self-adhesive coated electromagnetic steel sheet, the coating composition is firstly coated on the electromagnetic steel sheet to form the coating film. Then, a baking step is performed on the coating film to obtain a self-adhesive coated electromagnetic steel sheet, wherein the thickness of the baked coating film is greater than 0.8 μm to less than or equal to 5.5 μm, and the self-adhesive coated electromagnetic steel sheet is The coefficient of kinetic friction of the surface of the sheet is equal to or greater than 0.05 to less than 0.25. The aforementioned coating composition comprises an aqueous hydroxyl-containing resin (A), an aqueous hardener (B), a nanocolloid solution (C), a silane coupling agent (D) and a wax dispersion liquid (E), wherein according to the aqueous hydroxyl-containing resin ( The content of A) is 100 parts by weight, and the content of the wax dispersion liquid (E) is 0.1 to 0.5 parts by weight.

According to an embodiment of the present invention, according to the content of the aqueous hydroxyl-containing resin (A) is 100 parts by weight, the content of the nanocolloid solution (C) is equal to or greater than 2 parts by weight to less than 13 parts by weight.

According to another embodiment of the present invention, the water-based hardener (B) comprises a carbodiimide compound.

According to yet another embodiment of the present invention, the baking temperature of the baking step is greater than 150°C to less than 330°C.

According to another aspect of the present invention, a self-adhesive coated electromagnetic steel sheet is provided. The self-adhesive coated electromagnetic steel sheet is produced by the aforementioned manufacturing method of the self-adhesive coated electromagnetic steel sheet, wherein the arithmetic mean height roughness of the surface of the self-adhesive coated electromagnetic steel sheet is 0.20 μm to 0.35 μm μm.

According to an embodiment of the present invention, according to the standard method of JIS-C2550, the insulating property of the self-adhesive coated electromagnetic steel sheet is not less than 10Ωcm ² /sheet.

According to yet another aspect of the present invention, a method for manufacturing a laminated iron core is provided. In the above-mentioned manufacturing method of the laminated iron core, a plurality of the above-mentioned self-adhesive coated electromagnetic steel sheets are firstly stacked, and then a bonding step is performed on the stacked self-adhesive coated electromagnetic steel sheets to obtain the laminated iron core, The bonding temperature in the bonding step is 140°C to 260°C.

According to an embodiment of the present invention, the bonding time of the bonding step is 10 seconds to 90 seconds.

According to another embodiment of the present invention, the bonding pressure in the bonding step is 0.5N/mm ² to 3.5N/mm ² .

Yet another aspect of the present invention provides a laminated iron core. The laminated iron core is produced by the above-mentioned manufacturing method of the laminated iron core, wherein the bonding strength of the laminated iron core at room temperature is 0.5N/cm ² to 20N/cm ² .

Applying the self-adhesive coated electromagnetic steel sheet of the present invention and its manufacturing method, wherein at a specific baking temperature, the self-adhesive type is obtained by using a baked coating film with a specific composition and a specific thickness. The coated electromagnetic steel sheet has an appropriate coefficient of kinetic friction and arithmetic mean height roughness, as well as good insulation. Further, applying the laminated iron core of the present invention and the manufacturing method thereof, wherein the self-adhesive coated electromagnetic steel sheet is used at a specific bonding temperature to obtain a laminated iron core with good bonding strength at room temperature.

The manufacture and use of embodiments of the present invention are discussed in detail below. It should be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are provided for illustration only, and are not intended to limit the scope of the invention.

Please refer to FIG. 1 , which is a schematic flowchart of a method for manufacturing a self-adhesive coated electromagnetic steel sheet according to an embodiment of the present invention. In the manufacturing method 100 of the self-adhesive coated electromagnetic steel sheet, the coating composition is firstly coated on the electromagnetic steel sheet to form a coating, as shown in step 110 .

After step 110, a baking step is performed on the aforementioned coating film to obtain a self-adhesive coated electromagnetic steel sheet, wherein the thickness of the baked coating film is greater than 0.8 μm to less than or equal to 5.5 μm, and the baking step The baking temperature is greater than 150° C. to less than 330° C., as shown in step 120 . In some embodiments, the thickness of the baked coating film is preferably 1.5 μm to 3.0 μm.

When the thickness of the baked coating film is less than or equal to 0.8μm, the dynamic friction coefficient of the surface of the self-adhesive coated electromagnetic steel sheet is equal to or greater than 0.25. In the steel coil slitting process, the self-adhesive coated electromagnetic steel sheet produces excessive frictional force on the wool felt of the slitting machine, which makes it difficult to carry out the slitting process. Secondly, too thin baked coating will reduce the corrosion resistance of self-adhesive coated electromagnetic steel sheet. Furthermore, when a plurality of self-adhesive coated electromagnetic steel sheets are in the bonding step, when the bonding pressure is applied to the coating film at the bonding temperature, the coating film will flow glue, and when the baked coating film is too thin When , the direct contact between the electromagnetic steel sheets is likely to occur, and the insulation of the self-adhesive coated electromagnetic steel sheets and the bonding strength of the laminated iron core at room temperature are reduced.

On the other hand, when the thickness of the baked coating film is greater than 5.5 μm, the dynamic friction coefficient of the surface of the self-adhesive coated electromagnetic steel sheet is less than 0.05. The aforementioned self-adhesive coated electromagnetic steel sheet and the wool felt of the slitting machine are easy to slide, so that the steel coil cannot be coiled, and it is difficult to manufacture the subsequent laminated iron core.

In some embodiments, the baking temperature of the baking step is preferably 170°C to 310°C, and more preferably 190°C to 260°C. The aforementioned baking is used to remove the solvent to dry the coating film. In this step 120, the coating film is not completely cured, so that the coating film can be further cured during the subsequent pressure bonding of the self-adhesive coated electromagnetic steel sheet, so as to achieve the purpose of bonding the electromagnetic steel sheet. Incomplete curing means that the components of the coating film have not been fully reacted, that is, the water-based hydroxyl-containing resin (A) still has active functional groups, which can interact with the water-based hardener (B) and/or silane coupling agent. (D) The reaction is carried out.

When the baking temperature is greater than 150°C to less than 330°C, the solvent in the coating film can be completely removed, and no residual solvent small molecules damage the insulation, thus improving the insulation of the self-adhesive coated electromagnetic steel sheet. In addition, the coating film is not completely cured, which is conducive to the subsequent pressure bonding, so as to improve the bonding strength of the laminated iron core.

In some embodiments, the arithmetic mean height roughness of the surface of the self-adhesive coated electromagnetic steel sheet is 0.20 μm to 0.35 μm. When the thickness of the baked coating film is greater than 0.8 μm to less than or equal to 5.5 μm, the arithmetic mean height roughness of the surface of the self-adhesive coated electromagnetic steel sheet is 0.20 μm to 0.35 μm, and preferably 0.26 μm to 0.33 μm. When the arithmetic mean height roughness of the surface of the self-adhesive coated electromagnetic steel sheet is 0.20 μm to 0.35 μm, the surface of the self-adhesive coated electromagnetic steel sheet is covered with a suitable amount of coating film, which is conducive to the subsequent pressure bonding , can avoid the direct contact of the electromagnetic steel sheet, so as to improve the bonding strength of the laminated iron core.

In addition to the aforementioned properties of the coefficient of kinetic friction and the arithmetic mean height roughness, in some embodiments, according to the JIS-C2550 standard method, the self-adhesive coated electromagnetic steel sheet of the present invention selectively has an insulation of not less than 10Ωcm ² /sheet sex. In other embodiments, the self-adhesive coated electromagnetic steel sheet of the present invention selectively has a roughness in maximum height (R _z ) of 2.0 to 1.35 μm.

In the aforementioned step 110, the coating composition comprises the water-based hydroxyl-containing resin (A), the water-based hardener (B), the nanocolloid solution (C), the silane coupling agent (D) and the wax dispersion (E), wherein The coating composition does not contain inorganic acids containing chromium, zirconium, and phosphorus and their inorganic acid salts.

The water-based hydroxyl-containing resin (A) referred to in the present invention refers to a polymer compound having two or more hydroxyl groups. Further, the water-based hydroxyl-containing resin (A) can be made of water-based polyurethane, water-based polyether polyol, water-based polyester polyol, polyurea resin, polyolefin resin and/or water-based epoxy resin, and acrylic acid and its derivatives. Synthetic polymers. For example, acrylic acid and its derivatives include monomers such as acrylic acid, methacrylic acid, acrylates, methacrylates and their salts.

Specifically, the water-based hydroxyl-containing resin (A) can be a copolymer of acrylic and epoxy resin, a copolymer of acrylic and polyurea resin, a copolymer of acrylic and polyolefin resin or any combination thereof . In addition, the aforementioned epoxy resin may optionally contain a carboxyl group-modified epoxy resin. Preferably, the water-based hydroxyl-containing resin (A) is a polyurethane resin (A1), a polyester polyol resin (A2), a methacrylic resin (A3) and a carboxyl-modified epoxy resin (A4).

The hydroxyl value of the water-based hydroxyl-containing resin (A) will affect the dispersibility of the water-based hydroxyl-containing resin (A) in the coating composition, the corrosion resistance of the self-adhesive coated electromagnetic steel sheet and the bonding strength of the laminated iron core. In some embodiments, the hydroxyl value of the aqueous hydroxyl-containing resin (A) is 50 mgKOH/g to 400 mgKOH/g, and preferably 50 mgKOH/g to 250 mgKOH/g.

When the hydroxyl value of the water-based hydroxyl-containing resin (A) ranges from 50 mgKOH/g to 400 mgKOH/g, the water-based hydroxyl-containing resin (A) is likely to form a dense and uniform coating film, which improves the corrosion resistance of the self-adhesive coated electromagnetic steel sheet. .

The weight average molecular weight of the water-based hydroxyl-containing resin (A) will affect the elongation at break of the water-based hydroxyl-containing resin (A), thereby affecting the corrosion resistance of the self-adhesive coated electromagnetic steel sheet. In some embodiments, the weight average molecular weight of the aqueous hydroxyl-containing resin (A) is 10,000 g/mole to 300,000 g/mole, and preferably 10,000 g/mole to 100,000 g/mole. When the weight average molecular weight of the water-based hydroxyl-containing resin (A) is 10,000 g/mole to 300,000 g/mole, the elongation at break of the water-based hydroxyl-containing resin (A) is 50% to 150%, so as to improve the ductility of the coating film, Thereby, the corrosion resistance of the self-adhesive coated electromagnetic steel sheet is improved.

The glass transition temperature of the water-based hydroxyl-containing resin (A) will affect the corrosion resistance of the self-adhesive coated electromagnetic steel sheet and the bonding strength of the laminated iron core. In some embodiments, the glass transition temperature of the aqueous hydroxyl-containing resin (A) is 40°C to 90°C. When the glass transition temperature of the water-based hydroxyl-containing resin (A) is 40°C to 90°C, the coating film has toughness and is easy to be coated on the surface of the electromagnetic steel sheet to improve the corrosion resistance of the self-adhesive coated electromagnetic steel sheet. Enhances the bonding strength of the laminated core.

In the aforementioned coating composition, the water-based hardener (B) refers to a carbodiimide compound, and it has one or more carbodiimide groups. In some embodiments, the aqueous hardener (B) may include, but is not limited to, N,N'-dicyclohexylcarbodiimide (N,N'-dicyclohexylcarbodiimide, DCC), N,N'-diisopropyl Carbodiimide (N,N'-diisopropyl carbodiimide, DIC), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (1-ethyl-3-(3-dimethylaminopropyl) carbodiimide, EDC) or any combination thereof.

The content of water-based hardener (B) will affect the corrosion resistance of the coating film to the electromagnetic steel sheet and the bonding strength of the laminated iron core. According to 100 parts by weight of the aforementioned water-based hydroxyl-containing resin (A), the content of the water-based hardener (B) is 5 to 20 parts by weight, and preferably 8 to 15 parts by weight. When the content of the water-based hardener (B) is 5 to 20 parts by weight, the water-based hardener (B) can make the coating film of the electromagnetic steel sheet produce a sufficient degree of cross-linking after pressure bonding, thereby improving the self-adhesive type. Corrosion resistance of coated electromagnetic steel sheet and bonding strength of laminated iron core.

The aqueous hardener (B) of the present invention is a carbodiimide compound. In other words, under normal circumstances, the polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3) and hydroxyl-modified epoxy resin (A4) of the present invention are not easily compatible with aromatic amines. react. In addition, the coating formed by the polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3) and hydroxyl-modified epoxy resin (A4) of the present invention and blocked isocyanate as a hardener The compactness of the film is not good. The reason is that the blocked isocyanate is deblocked during the baking process, and the protective group after the deblocking of the blocked isocyanate is vaporized and volatilized, which is easy to form pores in the coating film structure, resulting in a dense coating film. Poor degree of corrosion, thereby reducing corrosion resistance. Coating film prepared by polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3), hydroxyl-modified epoxy resin (A4) and dicyandiamide as hardener of the present invention It does not have good curing ability, the reason is that the curing and crosslinking temperature of the polycyanamide type hardener is relatively high, which requires a higher reaction temperature and a longer reaction time.

In the aforementioned coating composition, the nano-colloid solution (C) refers to a colloidal solution formed by particles with an average particle size of 0.01 μm to 0.5 μm, wherein the components of the aforementioned particles can be selected from alkali metals, alkaline earth metals , a group consisting of oxides of main group metals, metalloids and transition metals. In some examples, the nanocolloid solution (C) comprises a silica nanocolloid solution (C1), an alumina nanocolloid solution (C2), a titanium dioxide nanocolloid solution (C3), or a combination thereof.

In some examples, based on 100 parts by weight of the aqueous hydroxyl-containing resin (A), the content of the nanocolloid solution (C) is equal to or greater than 2 parts by weight to less than 13 parts by weight, and preferably 6 parts by weight to 11 parts by weight.

When the content of the nanocolloid solution (C) is equal to or greater than 2 parts by weight to less than 13 parts by weight, the particles of the nanocolloid solution (C) are stable and will not aggregate into large particles, so that the smoothness of the coating film and the The uniformity becomes better, and the self-adhesive coated electromagnetic steel sheet has an appropriate coefficient of kinetic friction, which is beneficial to the coiling of steel coils. In addition, the particles of the nanocolloid solution (C) are non-conductive and are not easily reduced in size due to baking, so that the insulation properties of the self-adhesive coated electromagnetic steel sheet can be improved.

In the aforementioned coating film composition, the silane coupling agent (D) is used to provide adhesion between the coating film and the electromagnetic steel sheet. Specifically, the silane coupling agent (D) forms a two-dimensional or three-dimensional cross-linked structure of silicon-oxygen (Si-O) bonds, and forms silicon in the bonding interface between the silane coupling agent (D) and the surface of the electrical steel sheet. - Oxygen-metal (Si-OM) bonds. Therefore, through the aforementioned silicon-oxygen bond and silicon-oxygen-metal bond, the silane coupling agent (D) helps to improve the corrosion resistance of the self-adhesive coated electromagnetic steel sheet and the bonding strength of the laminated iron core.

In some embodiments, the silane coupling agent (D) includes an aminosilane compound (D1) and/or an epoxysilane compound (D2). The aforementioned amino group of the amino silane compound (D1) and the epoxy group of the epoxy silane compound (D2) can increase the compatibility of the silane coupling agent (D) and the nanocolloid solution (C) to increase the silane coupling The mixture (D) is adsorbed on the nanocolloid surface in the nanocolloid solution (C), and further enhances the bonding strength of the laminated iron core.

Specific examples of the aforementioned aminosilane compound (D1) may include γ-aminopropyltrimethoxysilane (D1), γ-epoxypropanylpropyltrimethoxysilane (D2), N-β(aminopropyltrimethoxysilane) Ethyl)-γ-aminopropylmethyldiethoxysilane, N-β(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β(aminoethyl)-γ -aminopropyltriethoxysilane or a combination thereof. Specific examples of the aforementioned epoxy silane compound (D2) may include γ-propylene oxide propyl trimethoxysilane, γ-propylene oxide propyl triethoxy silane, γ-propylene oxide propyl methyl Diethoxysilane or a combination thereof.

In some embodiments, the content of the silane coupling agent (D) is 0.1 parts by weight to 2 parts by weight, and preferably 1.0 parts by weight to 1.5 parts by weight. When the content of the silane coupling agent (D) is 0.1 to 2 parts by weight, the silane coupling agent (D) can improve the corrosion resistance of the self-adhesive coated electromagnetic steel sheet and the bonding strength of the laminated iron core.

In the coating composition (ie in the case of an aqueous solution) the water-based hardener (B) and the silane coupling agent (D) can be adsorbed on the particle surfaces of the nanocolloids in the nanocolloid solution (C). When gradually dried, the water-based hardener (B) and the silane coupling agent (D) can move with the particles of the nano-colloids to achieve uniform dispersion on the surface of the coating film. Therefore, the particle surface of the nanocolloid can be used as the action point of the bonding reaction, thereby achieving the effect of enhancing the bonding strength.

In the aforementioned coating composition, the wax dispersion (E) is used to provide the surface lubricity of the self-adhesive coated electromagnetic steel sheet. In some embodiments, the wax dispersion (E) comprises a polyethylene-modified aqueous emulsifying wax (E1) and/or an aqueous poly(terafluoroethene) (PTFE) emulsifying wax (E2).

In some embodiments, the melting points of the polyethylene-modified water-based emulsifying wax (E1) and the water-based Teflon emulsifying wax (E2) are both 100°C to 130°C, and preferably 100°C to 120°C. When the melting point of polyethylene modified water-based emulsifying wax (E1) and water-based Teflon emulsifying wax (E2) is 100℃ to 130℃, the surface of self-adhesive coated electromagnetic steel sheet has an appropriate coefficient of kinetic friction, which is beneficial to the room Slitting and cutting of electromagnetic steel sheets under temperature.

In some embodiments, according to the content of the aforementioned aqueous hydroxyl-containing resin (A) is 100 parts by weight, the content of the wax dispersion liquid (E) is 0.1 parts by weight to 0.5 parts by weight. When the content of the wax dispersion (E) is less than 0.1 parts by weight, too little wax dispersion (E) will lead to an excessively high coefficient of kinetic friction on the surface of the self-adhesive coated electromagnetic steel sheet, which may easily cause the steel coil to loosen.

When the content of the wax dispersion liquid (E) is more than 0.5 parts by weight, too much wax dispersion liquid (E) will cause the coefficient of dynamic friction on the surface of the self-adhesive coated electromagnetic steel sheet to be too low, and the self-adhesive coated electromagnetic steel sheet will easily Sliding, which is not conducive to the operation of steel coil coiling. In addition, too much wax dispersion liquid (E) will lead to poor cross-linking degree of the chemical structure of the coating film, thereby reducing the bonding strength of the laminated iron core.

Please refer to FIG. 2 , which is a schematic flowchart of a method for manufacturing a laminated core according to an embodiment of the present invention. In the manufacturing method 200 of the laminated iron core of the present invention, a plurality of the aforementioned self-adhesive coated electromagnetic steel sheets are firstly stacked, as shown in step 210 . In some embodiments, the number of self-adhesive coated electromagnetic steel sheets 200 may be 15 to 25 sheets.

After the aforementioned step 210 , a bonding step is performed on the stacked self-adhesive coated electromagnetic steel sheets to obtain a laminated core, wherein the bonding temperature of the bonding step is 140° C. to 260° C., as shown in step 220 .

The aforementioned bonding temperature is used to provide the coating films between the aforementioned self-adhesive coated electromagnetic steel sheets to undergo a complete curing reaction, so as to bond these self-adhesive coated electromagnetic steel sheets. In some embodiments, the bonding temperature of the bonding step is preferably 150°C to 250°C. When the bonding temperature is less than 140°C, the too low bonding temperature cannot make the coating film fully cured, resulting in poor bonding strength of the laminated iron core. When the bonding temperature is higher than 260°C, the excessively high bonding temperature will lead to the deterioration of the coating film of the self-adhesive coated electromagnetic steel sheet and reduce the bonding strength of the laminated iron core. In detail, the aforementioned deterioration may be the thermal cracking phenomenon of the organic resin.

In some embodiments, the bonding time of the bonding step is 10 seconds to 90 seconds, and preferably 30 seconds to 60 seconds. The aforementioned bonding time is the time for providing the aforementioned curing reaction. When the bonding time is 10 seconds to 90 seconds, sufficient bonding time can improve the bonding strength of the laminated iron core.

In some embodiments, the bonding pressure of the bonding step is 0.5 N/mm ² to 3.5 N/mm ² , and preferably 1.0 N/mm ² to 3.0 N/mm ² . The aforementioned bonding pressure is used for applying pressure to the stacked self-adhesive coated electromagnetic steel sheets during the aforementioned curing reaction, so as to facilitate the bonding of the coating films, thereby producing a laminated core. When the bonding pressure is 0.5N/mm ² to 3.5N/mm ² , the proper bonding pressure can help the bonding of the self-adhesive coated electromagnetic steel sheets, and maintain a proper thickness between the self-adhesive coated electromagnetic steel sheets to avoid direct contact between the electromagnetic steel sheets and improve the bonding strength of the laminated core.

The laminated iron core produced by the method for manufacturing the laminated iron core of the present invention has an adhesive strength at room temperature of 0.5 N/cm ² to 20 N/cm ² . In some embodiments, the laminated iron core of the present invention selectively has a bonding strength of 0.5 N/cm ² to 20 N/cm ² after high temperature aging, after oil soaking or thermal shock.

The following examples are used to illustrate the application of the present invention, but it is not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Manufacture of self-adhesive coated electromagnetic steel sheet Example 1

Cut the electromagnetic steel sheet into a size of 100 mm in width and 300 mm in length, wash with neutral detergent and water in sequence, and then dry the electromagnetic steel sheet. Then, the coating film composition of Example 1 was coated on the surface of the electrical steel sheet. Using a hot air baking furnace, bake the coated electromagnetic steel sheet at 170°C to 300°C to form a baked coating film with a thickness of 4.8 μm. After cooling at room temperature, the self-adhesive coated electromagnetic steel sheet of Example 1 can be prepared. Examples 2 to 36 and Comparative Examples 1 to 9

The self-adhesive coated electromagnetic steel sheets of Examples 2 to 36 and Comparative Examples 1 to 9 were prepared in a similar manner to that of Example 1. The difference is that Examples 2 to 36 and Comparative Examples 1 to 9 use different coating film compositions, baking temperatures and film thicknesses after baking, and their specific conditions and evaluation results are shown in Table 1, wherein The evaluation method will be described later.

Table 1

Table 1 (continued)

Table 1 (continued)

A1為由長興材料工業股份有限公司所製造之聚氨酯樹脂，其產品編號為8920，且羥價為170 mgKOH/g，重量平均分子量為12000 g/mole。 A2為由聚益化學工業股份有限公司所製造之聚酯多元醇樹脂，其產品編號為JP-2406，且羥價為150 mgKOH/g，重量平均分子量為20000 g/mole。 A3為由長興材料工業股份有限公司所製造之甲基丙烯酸樹脂，其產品編號為AC-27，且羥價為200 mgKOH/g，重量平均分子量為50000 g/mole。 A4為由南亞化工股份有限公司所製造之羧基改性環氧樹脂，其產品編號為NP-293，且羥價為250 mgKOH/g，重量平均分子量為25000 g/mole。 B為由日清紡績株式會社所製造之碳二亞胺基硬化劑，其產品編號為Carbodilite SV-02。 C1為由日產化學股份有限公司所製造之二氧化矽奈米膠體溶液，其產品編號為Snowtex-0。 C2為由日產化學股份有限公司所製造之氧化鋁奈米膠體溶液，其產品編號為Aluminasol。 C3為由勢得科研股份有限公司所製造之二氧化鈦奈米膠體溶液，其產品編號為FMPV。 D1為由Evonik股份有限公司所製造之γ-胺基丙基三甲氧基矽烷，其產品編號為Dynasylan® AMMO。 D2為由Evonik股份有限公司所製造之γ-環氧基丙烷基丙基三甲氧基矽烷，其產品編號為Dynasylan® GLYMO。 E1為由畢克化學有限公司所製造之聚乙烯改質水性乳化蠟，其產品編號為Hordamer PE03，且所含有的蠟成份之熔點為105℃。 E2為由畢克化學有限公司所製造之水性鐵氟龍乳化蠟，其產品編號為Ceracol 607，且所含有的蠟成份之熔點為112℃。 積層鐵芯之製造 應用例1Table 1 (continued)

A1 is a polyurethane resin manufactured by Changxing Materials Industry Co., Ltd., its product number is 8920, its hydroxyl value is 170 mgKOH/g, and its weight average molecular weight is 12000 g/mole. A2 is a polyester polyol resin manufactured by Juyi Chemical Industry Co., Ltd., its product number is JP-2406, its hydroxyl value is 150 mgKOH/g, and its weight average molecular weight is 20000 g/mole. A3 is a methacrylic resin manufactured by Changxing Materials Industry Co., Ltd., its product number is AC-27, its hydroxyl value is 200 mgKOH/g, and its weight average molecular weight is 50000 g/mole. A4 is a carboxyl-modified epoxy resin manufactured by Nanya Chemical Co., Ltd., its product number is NP-293, its hydroxyl value is 250 mgKOH/g, and its weight average molecular weight is 25000 g/mole. B is a carbodiimide-based hardener manufactured by Nisshinbo Co., Ltd., whose product code is Carbodilite SV-02. C1 is a silica nanocolloid solution manufactured by Nissan Chemical Co., Ltd., and its product number is Snowtex-0. C2 is an alumina nanocolloid solution manufactured by Nissan Chemical Co., Ltd., whose product code is Aluminasol. C3 is a titanium dioxide nanocolloid solution manufactured by Side Scientific Co., Ltd., and its product code is FMPV. D1 is γ-aminopropyltrimethoxysilane manufactured by Evonik Co., Ltd., product code Dynasylan® AMMO. D2 is γ-epoxypropanylpropyltrimethoxysilane manufactured by Evonik Co., Ltd. with the product code Dynasylan® GLYMO. E1 is a polyethylene-modified water-based emulsified wax manufactured by BYK Chemicals Co., Ltd., its product number is Hordamer PE03, and the melting point of the wax component contained is 105°C. E2 is a water-based Teflon emulsified wax manufactured by BYK Chemical Co., Ltd., its product number is Ceracol 607, and the melting point of the wax component contained is 112°C. Manufacturing Application Example 1 of Laminated Iron Core

Stack 50 sheets of the self-adhesive coated electromagnetic steel sheets obtained above, and bond these electromagnetic steel sheets under the bonding conditions of a bonding temperature of 200°C, a bonding time of 60 seconds, and a pressure of 1 N/mm ² to make The laminated iron core of Application Example 1 was obtained. Application Examples 2 to 36 and Comparative Application Examples 1 to 9

The laminated iron cores of Application Examples 2 to 36 and Comparative Application Examples 1 to 9 were produced in a similar manner to that of Application Example 1, respectively. The difference is that Application Examples 2 to 36 and Comparative Application Examples 1 to 9 use the corresponding self-adhesive coated electromagnetic steel sheets of Examples 2 to 36 and Comparative Examples 1 to 9 respectively. The specific conditions and evaluation results are shown in the table. 2 shown. Evaluation method 1. Kinetic friction coefficient

The coefficient of kinetic friction is measured according to the Bowden test, using a weight with a load of 100 g, on the friction coefficient meter, scraping the surface of the coating film with a steel ball to measure the coefficient of kinetic friction, where the speed is 150 mm/min, the diameter of the ball is 150 mm/min is 5 mm, and the test temperature is 25°C. The specific evaluation criteria are as follows: ◎: 0.15≦dynamic friction coefficient<0.20. ○: 0.10≦dynamic friction coefficient<0.15, or 0.20≦dynamic friction coefficient<0.25. △: 0.05≦dynamic friction coefficient<0.10, or 0.25≦dynamic friction coefficient<0.30. ╳: The coefficient of kinetic friction is less than 0.05, or 0.30≦the coefficient of kinetic friction. 2. Arithmetic mean height roughness and maximum height roughness

The arithmetic mean height roughness and the maximum height roughness were measured according to the standard method of Japanese Industrial Standard (JIS) B 0601-2001. 3. Corrosion resistance

Corrosion resistance: The aforementioned self-adhesive coated electromagnetic steel sheet was placed on a salt spray test machine, and a 5% NaCl aqueous solution was sprayed on the surface of the self-adhesive coated electromagnetic steel sheet. After 5 hours, blow dry the steel sheet, and then check the rusted area on the surface of the steel sheet, and the specific evaluation criteria are as follows: ◎: 0%≦corrosion area＜25%. ○: 25%≦corrosion area＜50%. △: 50%≦corrosion area<75%. ╳: 75%≦corrosion area≦100%. 4. Insulation

The insulating property is based on the standard method of JIS-C2550, using an interlaminar resistivity tester to conduct an interlaminar resistance test to measure the interlaminar resistance of the self-adhesive coated electromagnetic steel sheets of the foregoing examples and comparative examples. And the specific evaluation criteria are as follows: ◎: 25Ωcm ² /sheet≦interlayer resistance. ○: 10Ωcm ² /piece≦Interlayer resistance<25Ωcm ² /piece. △: 5Ωcm ² /piece≦Interlayer resistance<10Ωcm ² /piece. ╳: 0Ωcm ² /piece≦Interlayer impedance<5Ωcm ² /piece. 5. Adhesion strength at room temperature

The bond strength at room temperature is measured at room temperature by using a universal tensile machine to measure the shear stress of the laminated iron core, and the maximum value of the shear stress is used to evaluate the bonding strength. The test speed of the universal tensile machine is 5 mm/min, and the specific evaluation criteria are as follows: ⊚: 5N/mm ² ≦maximum value of shear stress≦20N/mm ² . ○: 0.5N/mm ² ≦ maximum value of shear stress<5N/mm ² . △: 0N/mm ² ≦Maximum value of shear stress<0.5N/mm ² . ╳: Unable to bond. 6. Bond strength after high temperature aging

The bonding strength after high temperature aging is to first place the laminated iron core in an atmospheric environment of 150 °C, and after 2000 hours, use a universal tensile machine to measure the shear stress of the laminated iron core, and use the maximum value of shear stress to evaluate high temperature aging Post bond strength, and the operating conditions and evaluation criteria of the universal tensile machine are the same as the aforementioned evaluation methods for bond strength at room temperature. 7. Bonding strength after oil soaking

The bonding strength after soaking in oil is to first place the laminated iron core in hot oil at 150°C, and after 2000 hours, use a universal tensile machine to measure the shear stress of the laminated iron core, and use the maximum shear stress to evaluate the high temperature aging. Bond strength, and the operating conditions and evaluation criteria of the universal tensile machine are the same as the aforementioned evaluation methods for bond strength at room temperature. 8. Adhesion strength after thermal shock

The bonding strength after thermal shock is to first place the laminated iron core in an environment of 150°C, and after the laminated iron core reaches 150°C, the temperature is instantly lowered to -40°C. After the laminated iron core reaches -40°C, the temperature rises to 150°C instantaneously, which is regarded as one cycle of thermal shock. When the laminated iron core has undergone 300 cycles, the shear stress of the laminated iron core is measured by a universal tensile machine, and the maximum value of the shear stress is used to evaluate the bonding strength after high temperature aging, and the operating conditions and evaluation criteria of the universal tensile machine are the same as The evaluation method of the bonding strength at room temperature is the same as described above.

Table 2

Table 2 (continued)

Table 2 (continued)

Table 2 (continued)

Please refer to Table 1 above, according to the evaluation results of the dynamic friction coefficient of the self-adhesive coated electromagnetic steel sheet, compared with Comparative Example 1 and Comparative Example 2 without adding wax dispersion (E), and the too thin baked In Comparative Examples 7 and 8 of the coating film thickness, the self-adhesive coated electromagnetic steel sheets of each example have a relatively appropriate coefficient of kinetic friction. This shows that a specific amount of wax dispersion (E) and the thickness of the baked coating film can provide a suitable coefficient of kinetic friction for the self-adhesive coated electromagnetic steel sheet.

According to the evaluation results of the arithmetic mean height roughness of the self-adhesive coated electromagnetic steel sheet, the self-adhesive coated electromagnetic steel sheets of each embodiment are compared with Comparative Examples 7 and 8 which are too thin and baked. Has a suitable arithmetic mean height roughness. This shows that the specific baked coating film thickness can provide the more suitable arithmetic mean height roughness of the self-adhesive coated electromagnetic steel sheet.

According to the evaluation results of the insulating properties of the self-adhesive coated electrical steel sheet, compared with Comparative Example 1 without adding wax dispersion (E), Comparative Example 3 without adding nanocolloid solution (C), too low baking In the comparative example 5 of the baking temperature and the comparative examples 7 and 8 of the too thin baked coating film, the self-adhesive coated electromagnetic steel sheet of each embodiment has better insulating properties. Secondly, since the comparative example 4 has too much wax dispersion liquid (E), the particles in the wax dispersion liquid (E) are non-conductive, so compared with other comparative examples, the self-adhesive coating electromagnetic steel sheet of comparative example 4 has Better insulation. Furthermore, since the baking temperature of Comparative Example 6 is too high, the coating film has been completely cured, and a denser structure is formed. Therefore, compared with other Comparative Examples, the self-adhesive coated electromagnetic steel sheet of Comparative Example 6 has better performance. insulation. The above evaluation results show that the nanocolloid solution (C) and the wax dispersion (E) can improve the insulation properties of the self-adhesive coated electromagnetic steel sheet, and the thicker baked coating and higher baking temperature also It can improve the insulation of self-adhesive coated electromagnetic steel sheet.

According to the evaluation results of the bonding strength of the laminated iron core, compared with Comparative Example 1 without adding wax dispersion liquid (E) and nanocolloid solution (C), without adding silane coupling agent (D) and wax dispersion liquid (E) In the comparative example 2, the comparative example 3 without adding the nanocolloid solution (C), and the comparative example 4 adding the excess wax dispersion liquid (E), the laminated iron core of each example has better bonding strength. This shows that the coating film with a specific composition can improve the bonding strength of the laminated iron core.

Secondly, compared to Comparative Example 5 with an excessively low baking temperature and Comparative Example 6 with an excessively high baking temperature, the laminated iron cores of each embodiment have better bonding strength. This shows that the specific baking temperature increases the bonding strength of the laminated iron core. In other words, the baking temperature is used to remove the solvent in the coating film, and if the baking temperature is too low, the solvent will not be completely removed, and if the baking temperature is too high, the coating film will be completely cured, making it difficult to provide subsequent bond.

Furthermore, compared to Comparative Example 7 and Comparative Example 8 with too thin baked coating films, the laminated iron cores of each embodiment have better bonding strength. This shows that the specific baked coating thickness will improve the bonding strength of the laminated iron core. However, an excessively thin baked coating easily leads to direct contact between the electromagnetic steel sheets, thereby reducing the bonding strength of the laminated core at room temperature.

Further, compared to Comparative Example 9 with an excessively low bonding temperature, the laminated iron cores of each embodiment have better bonding strength. This shows that the specific bonding temperature will increase the bonding strength of the laminated iron core.

To sum up, the self-adhesive coated electromagnetic steel sheet and its manufacturing method of the present invention utilize a baked coating film with a specific composition and a specific thickness to obtain a suitable kinetic friction coefficient and an arithmetic mean height roughness The self-adhesive coated electromagnetic steel sheet. Further, the corrosion resistance and insulation properties of the self-adhesive coated electromagnetic steel sheet obtained by the specific baking temperature are improved. In addition, the laminated iron core of the present invention and the manufacturing method thereof utilize the aforementioned self-adhesive coated electromagnetic steel sheet to obtain a laminated iron core with good adhesion strength at room temperature at a specific adhesion temperature.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field to which the present invention pertains can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the appended patent application.

100,200: Method 110, 120, 210, 220: Steps

In order to have a more complete understanding of the embodiments of the present invention and their advantages, please refer to the following description together with the corresponding drawings. It must be emphasized that the various features are not drawn to scale and are for illustrative purposes only. The relevant diagrams are described as follows: [FIG. 1] is a schematic flow chart illustrating a method for manufacturing a self-adhesive coated electromagnetic steel sheet according to an embodiment of the present invention. [ FIG. 2 ] is a schematic flow chart illustrating a method for manufacturing a laminated core according to an embodiment of the present invention.

100: Method

110, 120: Steps

Claims (10)

A method for manufacturing a self-adhesive coated electromagnetic steel sheet, comprising: Coating a coating composition on an electromagnetic steel sheet to form a coating, wherein the coating composition comprises: Waterborne hydroxyl-containing resin (A); water-based hardener (B); Nanocolloid solution (C); Silane coupling agent (D); and Wax dispersion (E); Wherein, according to a content of the water-based hydroxyl-containing resin (A) is 100 parts by weight, a content of the wax dispersion liquid (E) is 0.1 to 0.5 parts by weight; and A baking step is performed on the coating film to obtain the self-adhesive coated electromagnetic steel sheet, wherein a thickness of the baked coating film is greater than 0.8 μm to less than or equal to 5.5 μm, and the self-adhesive coating film has a thickness of 5.5 μm or more. A coefficient of kinetic friction of one surface of the coated electromagnetic steel sheet is equal to or greater than 0.05 to less than 0.25. The method for manufacturing a self-adhesive coated electromagnetic steel sheet according to claim 1, wherein the content of the water-based hydroxyl-containing resin (A) is 100 parts by weight, and a content of the nanocolloid solution (C) is equal to Or more than 2 parts by weight to less than 13 parts by weight. The method for manufacturing a self-adhesive coated electromagnetic steel sheet according to claim 1, wherein the water-based hardener (B) comprises a carbodiimide compound. The method for manufacturing a self-adhesive coated electromagnetic steel sheet according to claim 1, wherein one of the baking temperatures in the baking step is greater than 150°C to less than 330°C. A self-adhesive coated electromagnetic steel sheet is obtained by using the method for manufacturing a self-adhesive coated electromagnetic steel sheet as described in any one of claims 1 to 4, wherein the self-adhesive coated electromagnetic steel sheet The arithmetic mean height roughness (R _a ) of one of the surfaces is 0.20 μm to 0.35 μm. The self-adhesive coated electromagnetic steel sheet according to claim 5, wherein according to the JIS-C2550 standard method, one of the insulation properties of the self-adhesive coated electromagnetic steel sheet is not less than 10Ωcm ² /sheet. A method for manufacturing a laminated iron core, comprising: Stacking a plurality of self-adhesive coated electromagnetic steel sheets as described in any one of claims 5 to 6; and A bonding step is performed on the stacked self-adhesive coated electromagnetic steel sheets to obtain the laminated iron core, wherein a bonding temperature of the bonding step is 140°C to 260°C. The method for manufacturing a laminated core according to claim 7, wherein a bonding time in the bonding step is 10 seconds to 90 seconds. The method for manufacturing a laminated core according to claim 7, wherein a bonding pressure in the bonding step is 0.5N/mm ² to 3.5N/mm ² . A laminated iron core, which is obtained by using the method for manufacturing a laminated iron core according to any one of claims 7 to 9, wherein one of the laminated iron cores has a room temperature bonding strength of 0.5N/cm ² to 20N /cm ² .

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