TW202202594A - Self-bonding coating compositions, self-bonding coating film, and method for producing the same - Google Patents

Abstract

The present invention relates to self-bonding coating compositions, a self-bonding coating film, and a method for producing the same. The self-bonding coating compositions include an aqueous hydroxyl-containing resin (A), an aqueous curing agent (B), a nano-colloid solution (C), a silicon coupling agent (D), and a wax dispersion (E). The nano-colloid solution (C), the silicon coupling agent (D), and the wax dispersion (E) in specific amounts can enhance lubricity, corrosion resistance, electrical insulation and bonding strength of the self-bonding coating film.

Description

Self-adhesive coating film composition, self-adhesive coating film and manufacturing method thereof

The present invention relates to a self-adhesive coating composition, and in particular to a self-adhesive coating composition, self-adhesive coating and the same which can provide good lubricity, corrosion resistance, insulation and bonding strength. Production method.

Electromagnetic steel sheet (electrical steel, ES) is used in the laminated iron core of generators, transformers and motors, wherein the laminated iron core of the motor can be assembled by welding or riveting. However, the welding method can easily lead to a short circuit at the edge of the laminated iron core and a decrease in the interlayer insulation, which in turn causes problems such as thermal deformation or variation in magnetic properties. In addition, during welding, the coating film may crack and generate harmful gas, which will endanger the health of the operator. In addition, the way of riveting is to fix by local riveting points, and the bonding strength of the obtained laminated iron core is not enough. At the same time, the depth of the rivet point is limited by the thickness of the base material, which makes it difficult to meet the strength requirements of the electromagnetic steel sheet.

In order to solve these problems, a self-adhesive coated electromagnetic steel sheet assembly bonding method has been developed. In the process, the self-adhesive coating composition is coated on the electromagnetic steel sheet by roller coating, and then the coated electromagnetic steel sheet is baked to obtain the self-adhesive coated electromagnetic steel sheet. The type coating film is in a state of incomplete curing. The aforementioned self-adhesive coated electromagnetic steel sheet is formed into loose sheets after being coiled, slit and punched. Then, after stacking a plurality of loose sheets and fixing them with a jig, heating and pressing are performed to completely cure the self-adhesive coating film, so as to bond the loose sheets and obtain a laminated iron core. Thereby, the variation of stress and iron loss caused by the aforementioned welding and riveting methods is improved, so as to improve the overall performance of the motor.

Nowadays, in the manufacturing process of the laminated iron core, the self-adhesive coating film is cured by using a cycle induction heating method and the aforementioned bonding step is performed to achieve a rapid temperature rise and greatly shorten the manufacturing time of the laminated iron core. However, when the conventional self-adhesive coating film adopts the cycle induction heating method, it encounters the problems of lubricity and corrosion resistance of the self-adhesive coating film electromagnetic steel sheet, as well as the insulation and bonding strength of the laminated iron core.

In view of this, there is an urgent need to develop a self-adhesive coating film composition, a self-adhesive coating film and a manufacturing method thereof to improve the above shortcomings.

In view of this, one aspect of the present invention provides a self-adhesive coating film composition. The self-adhesive coating film composition includes a composition with a specific content, and can produce a self-adhesive coating film with good lubricity, corrosion resistance, insulation and adhesive strength.

Another aspect of the present invention provides a method for producing a self-adhesive coating film. This manufacturing method utilizes the aforementioned self-adhesive coating film composition to produce a coating film.

Another aspect of the present invention provides a self-adhesive coating film. The self-adhesive coating film is prepared by the aforementioned manufacturing method of the self-adhesive coating film, wherein the self-adhesive coating film after baking has a thickness greater than 0.8 μm to less than or equal to 5.5 μm.

According to an aspect of the present invention, a self-adhesive coating composition is provided. The self-adhesive coating composition comprises a water-based hydroxyl-containing resin (A), a water-based hardener (B), a nanocolloid solution (C), a silane coupling agent (D) and a wax dispersion (E). Wherein, the water-based hydroxyl-containing resin (A) is selected from polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3), hydroxyl-modified epoxy resin (A4) and any of them A group formed by a combination. The aqueous hardener (B) contains a carbodiimide-based compound. The wax dispersion liquid (E) contains polyethylene-modified water-based emulsifying wax (E1) and/or water-based Teflon (poly(terafluoroethene), PTFE) emulsifying wax (E2). According to the content of the aqueous hydroxyl-containing resin (A) is 100 parts by weight, the content of the nanocolloid solution (C) is 2 parts by weight to less than 13 parts by weight, and the content of the wax dispersion liquid (E) is 0.1 parts by weight to 0.5 parts by weight share.

According to an embodiment of the present invention, the silane coupling agent (D) comprises an aminosilane compound (D1) and/or an epoxysilane compound (D2).

According to another embodiment of the present invention, according to the content of the water-based hydroxyl-containing resin (A) is 100 parts by weight, the content of the water-based hardener (B) is 5 parts by weight to 20 parts by weight.

According to another embodiment of the present invention, the content of the aqueous hydroxyl-containing resin (A) is 100 parts by weight, and the content of the silane coupling agent (D) is 0.1 to 2 parts by weight.

According to another embodiment of the present invention, the hydroxyl value of the aqueous hydroxyl-containing resin (A) is 50 mgKOH/g to 400 mgKOH/g.

According to another embodiment of the present invention, the weight ratio of the silane coupling agent (D) to the nanocolloid solution (C) is 1:1 to 1:15.

According to another embodiment of the present invention, the weight ratio of the silane coupling agent (D) to the aqueous hardener (B) is 1:5 to 1:20.

According to another embodiment of the present invention, the weight ratio of the aminosilane compound (D1) to the epoxysilane compound (D2) is 1.0:0.5 to 1.0:3.0.

According to another aspect of the present invention, a method for manufacturing a self-adhesive coating film is provided. In this manufacturing method, the aforementioned self-adhesive coating film composition is firstly subjected to a coating process to form a coating film. Then, at the baking temperature, the coating film is baked to obtain a self-adhesive coating film. The baking temperature is greater than 150°C to less than 330°C.

According to another aspect of the present invention, a self-adhesive coating film is provided. The self-adhesive coating film is prepared by the above-mentioned manufacturing method of the self-adhesive coating film, and the thickness of the coating film after baking is greater than 0.8 μm to less than or equal to 5.5 μm.

Applying the self-adhesive coating composition and the manufacturing method of the self-adhesive coating of the present invention, wherein a specific content of nanocolloid solution (C), silane coupling agent (D) and wax dispersion (E) are used, and With specific baking temperature and thickness of the coating film after baking, the self-adhesive coating film obtained from this can provide good lubricity, corrosion resistance, insulation and bonding strength.

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.

The self-adhesive film composition of the present invention comprises an aqueous hydroxyl-containing resin (A), an aqueous hardener (B), a nanocolloid solution (C), a silane coupling agent (D) and a wax dispersion (E). In addition, the self-adhesive coating film composition of the present invention does not contain inorganic acids containing chromium, zirconium, and phosphorus and inorganic acid salts thereof.

The water-based hydroxyl-containing resin (A) referred to in the present invention refers to a polymer compound having two or more hydroxyl groups. In some embodiments, the water-based hydroxyl-containing resin (A) is a liquid oligomer, which facilitates the coating of the water-based hydroxyl-containing resin (A), so that the barrier effect of the self-adhesive coating film can be improved, thereby improving the self-adhesive coating film. Corrosion of coated electromagnetic steel sheets.

The aforementioned waterborne hydroxyl-containing resin (A) can be synthesized from waterborne polyurethane, waterborne polyether polyol, waterborne polyester polyol, polyurea resin, polyolefin resin and/or waterborne epoxy resin, and acrylic acid and its derivatives of 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 hydroxyl-modified epoxy resin (A4).

The hydroxyl value of the water-based hydroxyl-containing resin (A) will affect the dispersion of the water-based hydroxyl-containing resin (A) in the self-adhesive coating composition, the corrosion resistance of the self-adhesive coating electromagnetic steel sheet and the bonding strength of the laminated 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) is 50 mgKOH/g to 400 mgKOH/g, the water-based hydroxyl-containing resin (A) is easy to form a dense and uniform coating film, which makes the self-adhesive coated electromagnetic steel sheet with Good corrosion resistance and mild reactivity between the water-based hydroxyl-containing resin (A) and the later-mentioned water-based hardener (B), so that the self-adhesive coating composition and the coating containing it have good stability.

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 that the self-adhesive coating film has Proper ductility can improve the adhesion strength of the coating film to the electromagnetic steel sheet, so the electromagnetic steel sheet coated with this coating film has good corrosion resistance.

The glass transition temperature of the water-based hydroxyl-containing resin (A) will affect the sticking resistance and corrosion resistance of the self-adhesive coated electromagnetic steel sheet, as well as 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 between 40°C and 90°C, the self-adhesive coating film has toughness and is not easy to stick to each other, so as to improve the sticking resistance and corrosion resistance of the self-adhesive coating electromagnetic steel sheet. properties, thereby enhancing the bonding strength of the laminated core.

In some embodiments, the average particle size of the aqueous hydroxyl-containing resin (A) is 0.05 μm to 0.5 μm.

The water-based hardener (B) referred to in the present invention refers to a carbodiimide compound having 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 adhesion strength and corrosion resistance of the self-adhesive 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 less than 5 parts by weight, too little water-based hardener (B) will lead to insufficient cross-linking degree of the self-adhesive coating film of the electrical steel sheet by pressure bonding, thereby reducing the lamination The bond strength of the iron core. When the content of the water-based hardener (B) is more than 20 parts by weight, too much water-based hardener (B) will lead to poor corrosion resistance of the self-adhesive coated electromagnetic steel sheet.

The nanocolloid solution (C) referred to in the present invention refers to a colloid 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, main group A group consisting of oxides of 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.

When the content of the nanocolloid solution (C) is less than 2 parts by weight, too little nanocolloid solution (C) cannot significantly improve the insulation and corrosion resistance, so the electromagnetic steel sheet coated with the self-adhesive coating film poor insulation and/or corrosion resistance. When the content of the nanocolloid solution (C) is equal to or greater than 13 parts by weight, too much nanocolloid solution (C) will lead to poor storage stability of the self-adhesive film composition and the coating containing it.

For example, the particles of the nanocolloid solution (C) will aggregate to form larger particles, which will precipitate and/or cause other components in the self-adhesive coating composition to be adsorbed on the surface of the particles and precipitated together. The coating flatness and uniformity of the self-adhesive coating film thus obtained are not good, and the particles formed by agglomeration on the surface of the electromagnetic steel sheet increase its roughness, resulting in the self-adhesive coating film of the electromagnetic steel sheet. poor lubricity and corrosion resistance. However, since the particles of the nanocolloid solution (C) have high heat resistance, the thickness of the coating film containing the particles is not easily thinned by baking, and the particles themselves are non-conductive materials to provide the coating film insulation, and In this way, the insulation of the self-adhesive coated electromagnetic steel sheet is improved.

The silane coupling agent (D) referred to in the present invention is used to provide adhesion between the self-adhesive 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-oxygen-metal (Si-O-metal) in the bonding interface between it and the surface of the electromagnetic steel sheet. Si-OM) bond. Therefore, the silane coupling agent (D) helps to improve the adhesion strength of the coating film by the aforementioned silicon-oxygen bond and silicon-oxygen-metal bond.

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 less than 0.1 parts by weight, too little silane coupling agent (D) cannot significantly improve the corrosion resistance and adhesion strength of the coating film of the self-adhesive coated electromagnetic steel sheet and the performance of the laminated iron core. bond strength. When the content of the silane coupling agent (D) is more than 2 parts by weight, an excessive amount of the silane coupling agent (D) will reduce the stability of the self-adhesive coating composition and the coating containing it.

In some embodiments, the weight ratio of the aminosilane compound (D1) and the epoxysilane compound (D2) is 1.0:0.5 to 1.0:3.0. When the weight ratio of the amino silane compound (D1) and the epoxy silane compound (D2) is 1.0:0.5 to 1.0:3.0, the adhesive strength and bonding strength of the obtained laminated iron core can be improved. The weight ratio of the aminosilane compound (D1) and the epoxysilane compound (D2) is preferably 1.0:0.5 to 1.0:1.0.

The wax dispersion liquid (E) in the present invention is used to improve the lubricity of the surface of the self-adhesive coated electromagnetic steel sheet and the bonding strength of the laminated iron core. 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 good lubricity, which is beneficial to indoor 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 wax dispersion (E) is less than 0.1 parts by weight, too little wax dispersion (E) will lead to insufficient lubricity on the surface of 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 surface lubricity of the self-adhesive coated electromagnetic steel sheet to be too high, and the self-adhesive coated electromagnetic steel sheet will be easily Sliding, which is not conducive to the operation of steel coil coiling. In addition, too much wax dispersion (E) will lead to poor cross-linking degree of the chemical structure of the self-adhesive coating film, thereby reducing the bonding strength of the laminated iron core.

Please refer to FIG. 1 , which is a schematic flowchart of a method for manufacturing a self-adhesive coating film according to an embodiment of the present invention. In the manufacturing method 100 of the self-adhesive coating film, a coating process of the composition of the self-adhesive coating film is first performed to form a coating film, as shown in step 110 .

In some embodiments, the self-adhesive coating composition is coated on the substrate using a roll coater to form a coating. For example, the aforementioned substrate includes materials such as metal, plastic or wood. Preferably, the aforementioned base material is steel, and more preferably an electromagnetic steel sheet. In some embodiments, the coating weight is 1.5 to 8.0 g/m ² .

After step 110 , the coating film is baked at a baking temperature greater than 150° C. to less than 330° C. to obtain a self-adhesive coating film, as shown in step 120 . In some embodiments, an electromagnetic steel sheet is used as a base material, and a self-adhesive coated electromagnetic steel sheet is prepared. In addition, the baking temperature may preferably be 170°C to 310°C, and more preferably 190°C to 268°C. The above-mentioned baking is used to remove water and other solvents and to dry the coating film. In this step 120, the water-based hydroxyl-containing resin (A) is not completely hardened, so as to provide chemical functional groups required for bonding between the self-adhesive coated electromagnetic steel sheets during subsequent pressure bonding, so as to carry out chemical reaction, and achieve the purpose of bonding.

When the baking temperature is less than or equal to 150°C, the water or other solvents contained in the self-adhesive coating film remain, or the anti-sticking property of the coating film becomes poor, which is not conducive to the cutting and stacking of the self-adhesive coating electromagnetic steel sheet Wait for the job. When the baking temperature is equal to or higher than 330°C, the water-based hydroxyl-containing resin (A) has been completely hardened, which is not conducive to the subsequent pressure bonding, resulting in a decrease in the bonding strength of the laminated iron core.

In some embodiments, the thickness of the self-adhesive coating film after baking is greater than 0.8 μm to less than or equal to 5.5 μm, and preferably 1.5 μm to 3.0 μm. When the thickness of the self-adhesive coating film after baking is greater than 0.8 μm to less than or equal to 5.5 μm, the self-adhesive coating film has good adhesion strength to the electromagnetic steel sheet, and the laminated iron core obtained therefrom. Has good corrosion resistance.

In some embodiments, after stacking a plurality of self-adhesive coated electromagnetic steel sheets, the self-adhesive coated electromagnetic steel sheets are pressure-bonded at 150°C to 250°C to obtain a laminated core. In some embodiments, the pressure of pressure bonding is 1 to 3 N/mm ² . In some embodiments, the time for pressure bonding is 30 to 60 seconds.

In general, the polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3) and hydroxyl-modified epoxy resin (A4) of the present invention are difficult to react with aromatic amines. In addition, the polyurethane resin (A1), the polyester polyol resin (A2), the methacrylic resin (A3) and the hydroxyl-modified epoxy resin (A4) of the present invention and the blocked isocyanate as the hardener form the self- The compactness of the sticky coating 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. The coating film is not dense enough, which in turn reduces corrosion resistance. The coatings obtained from polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3) and hydroxyl-modified epoxy resin (A4) and dicyandiamide as a hardener do not have good properties. The reason for the curing ability is that the curing and cross-linking temperature of the polyamide hardener is relatively high, which requires a higher reaction temperature and a longer reaction time.

The curing temperature of the water-based curing agent (B) and the cross-linking temperature of the silane coupling agent (D) will affect the aforementioned bonding temperature. However, in the self-adhesive 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 surface of the nanocolloid particles in the nanocolloid solution (C). When the self-adhesive coating composition is gradually dried, the water-based hardener (B) and the silane coupling agent (D) can move with the nanoparticles of the nanocolloid to achieve uniform dispersion on the surface of the self-adhesive coating. 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 some embodiments, the weight ratio of the silane coupling agent (D) to the nanocolloid solution (C) is 1:1 to 1:15, and preferably 1:2 to 1:11. When the weight ratio of the silane coupling agent (D) to the nanocolloid solution (C) is 1:1 to 1:15, the bonding strength of the laminated iron core can be further improved. In some embodiments, the weight ratio of the silane coupling agent (D) to the aqueous hardener (B) is 1:5 to 1:20, and preferably 1:7 to 1:13. When the weight ratio of the silane coupling agent (D) to the water-based hardener (B) is 1:5 to 1:20, the bonding strength of the laminated core can be further improved.

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. Preparation of self-adhesive coating composition Example 1

Mix 100 parts by weight of polyurethane resin (A1) (hydroxyl value is 170 mgKOH/g, and weight average molecular weight is 12000 g/mole), 9 parts by weight of water-based hardener (B), 2 parts by weight of silicon dioxide nanometer Colloidal solution (C1), 1 part by weight of γ-aminopropyltrimethoxysilane (D1) and 0.3 part by weight of polyethylene modified water-based emulsifying wax (E1), and stirring them evenly, to obtain Example 1 Self-adhesive coating composition. Examples 2 to 21 and Comparative Examples 1 to 8

The self-adhesive coating film compositions of Examples 2 to 21 and Comparative Examples 1 to 8 were prepared in a similar manner to that of Example 1. The difference is that Examples 2 to 21 and Comparative Examples 1 to 8 use different types and contents of water-based hydroxyl-containing resin (A), water-based hardener (B), nanocolloid solution (C), silane coupling agent (D) ) and wax dispersion (E), and their detailed compositions are shown in Table 1.

Table 1

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羥基改性環氧樹脂，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℃。 自黏型塗膜電磁鋼片及積層鐵芯之製造 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 Poly 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 hydroxyl-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., and its 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., and its 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. Application example of self-adhesive coated electromagnetic steel sheet and laminated iron core 1

First, cut the electromagnetic steel sheet into a size of 100 mm in width and 300 mm in length, and clean the electromagnetic steel sheet with neutral detergent. After washing with water and drying, the self-adhesive coating composition of Example 1 was coated on the surface of the electromagnetic steel sheet, wherein the coating amount was 1.5-8.0 g/m ² . Then use a hot air oven to bake the coated electromagnetic steel sheet at 170°C to 300°C to form a self-adhesive coating film with a thickness of 4.8 μm. Then, it was cooled at room temperature to obtain the self-adhesive coated electromagnetic steel sheet of Application Example 1.

Next, stack 50 sheets of the self-adhesive coated electromagnetic steel sheets obtained above, and press and bond these electromagnetic steel sheets to obtain the laminated iron core of Application Example 1, wherein the bonding temperature of 150 to 250°C, Bonding is performed under the bonding conditions of a bonding time of 30 to 60 seconds and a pressure of 1 to 3 N/mm ² . Application Examples 2 to 21 and Comparative Application Examples 1 to 8

Application Examples 2 to 21 and Comparative Application Examples 1 to 8 of the self-adhesive coated magnetic steel sheet and the laminated iron core were produced in the same manner as in Application Example 1, respectively. The difference is that Application Examples 2 to 21 and Comparative Application Examples 1 to 8 use the corresponding self-adhesive coating films of Examples 2 to 21 and Comparative Examples 1 to 8, respectively. The specific conditions and evaluation results are shown in Table 2. . Evaluation method 1. Adhesion strength

The adhesion strength of the coating film is to drop a 1 kg iron ball from a height of 50 cm to impact the self-adhesive coated electromagnetic steel sheet, and then stick the area impacted by the iron ball with 3M tape, and then tear off the tape. Then, immerse the self-adhesive coated electromagnetic steel sheet in a 5% copper sulfate aqueous solution, take it out after 5 seconds, and check the discoloration on the surface of the steel sheet. The specific evaluation criteria are as follows: ⊚: The surface of the steel sheet was not discolored at all. ○: Slight discoloration occurred on the surface of the steel sheet. △: Local discoloration occurs on the surface of the steel sheet. ╳: The surface of the steel sheet is completely discolored. 2. Anti-sticking

The anti-sticking property of the coating film is to stack two self-adhesive coated electromagnetic steel sheets first. Then, in the atmosphere, the stacked self-adhesive coated magnetic steel sheets were heated at 70°C, and a pressure of 5 MPa was applied. After 24 hours, cool to room temperature. Then, the pressure-treated self-adhesive coated electromagnetic steel sheets were separated by hand, and the adhesion resistance of the coating film was evaluated according to the adhesion state of the self-adhesive coated electromagnetic steel sheets. The specific evaluation criteria are as follows: ◎: The self-adhesive coated electromagnetic steel sheet can be completely separated. ○: There is a slight adhesion between the self-adhesive coated electromagnetic steel sheets. △: There is partial adhesion between the self-adhesive coated electromagnetic steel sheets. ╳: The self-adhesive coated electromagnetic steel sheet cannot be separated. 3. Lubricity

The lubricity is based on the Bowden test, using a weight with a load of 100 g, on the friction coefficient meter, scraping the surface of the self-adhesive coating film with a steel ball to measure the kinetic coefficient of friction (COF _k ) ), and the lubricity of the coating film was evaluated by the coefficient of kinetic friction, where the speed was 150 mm/min, the diameter of the ball was 5 mm, and the test temperature was 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. 4. 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 %. 5. 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: ◎: 25 Ωcm ² /sheet≦interlayer resistance. ○: 10 Ωcm ² /piece≦Interlayer resistance<25 Ωcm ² /piece. △: 5 Ωcm ² /piece≦Interlayer impedance<10 Ωcm ² /piece. ╳: 0 Ωcm ² /piece≦Interlayer impedance<5 Ωcm ² /piece. 6. Bonding strength

The bond strength 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: ⊚: 10 N/mm ² ≦ maximum value of shear stress<20 N/mm ² . ○: 5 N/mm ² ≦ maximum value of shear stress < 10 N/mm ² . △: 1 N/mm ² ≦Maximum value of shear stress<5 N/mm ² . ╳: 0 N/mm ² ≦Maximum value of shear stress＜1 N/mm ² .

Table 2

Table 2 (continued)

Please refer to Table 2 above, according to the evaluation results of the lubricity of the self-adhesive coated electromagnetic steel sheet, compared with Comparative Example 1 without wax dispersion (E) and Comparative Example 2 without wax dispersion (E) , the self-adhesive coated electromagnetic steel sheet of each embodiment has better lubricity. In addition, the comparative example 3 added an appropriate amount (0.1 to 0.5 weight parts) of the wax dispersion liquid (E), so the self-adhesive coated electromagnetic steel sheet of the comparative example 3 has better lubricity. Secondly, compared to Comparative Example 5 with too much nanocolloid solution (C), the self-adhesive coated electromagnetic steel sheets of each embodiment have better lubricity, wherein the excessive amount of nanocolloid solution (C) in the Particles are easy to aggregate to produce large particles, resulting in poor flatness of self-adhesive coating film and reduced lubricity. Furthermore, although too much nanocolloid solution (C) was added in Comparative Example 4, too much wax dispersion (E) in Comparative Example 4 improved the lubricity of the self-adhesive coated electromagnetic steel sheet.

According to the evaluation results of the corrosion resistance of the self-adhesive coated electromagnetic steel sheet, compared with Comparative Example 1 without the addition of the nanocolloid solution (C) and wax dispersion (E) and without the addition of the nanocolloid solution (C) In Comparative Example 3 and Comparative Example 2 without the addition of the silane coupling agent (D) and the wax dispersion (E), the self-adhesive coated electromagnetic steel sheets of each example have better corrosion resistance. Furthermore, compared with Comparative Example 4 and Comparative Example 5 in which too much nanocolloid solution (C) was added, the self-adhesive coated electromagnetic steel sheet of each embodiment has better corrosion resistance. In Comparative Example 4 and Comparative Example 5, the particles of the nanocolloid solution (C) easily aggregated to form large particles, resulting in uneven and non-dense self-adhesive coating films, and thus poor corrosion resistance of the adhesive coating films.

According to the evaluation results of the insulating properties of the self-adhesive coated electrical steel sheet, compared with Comparative Example 1 without the addition of the nanocolloid solution (C) and the wax dispersion (E), without the addition of the silane coupling agent (D) and wax In the comparative example 2 of the dispersion liquid (E) and the comparative example 3 without adding the nanocolloid solution (C), the self-adhesive coated electromagnetic steel sheet of each example has better insulating properties. Next, in Comparative Example 4 and Comparative Example 5, since the particles of the nanocolloid solution (C) are insulating, too much nanocolloid solution (C) improves the insulating properties of the self-adhesive coated electrical steel sheet.

According to the evaluation results of the adhesion strength of the self-adhesive coated electrical steel sheet, compared with Comparative Example 1 without the addition of the nanocolloid solution (C) and the wax dispersion (E), without the addition of the silane coupling agent (D) and wax In the comparative example 2 of the dispersion liquid (E) and the comparative example 3 without adding the nanocolloid solution (C), the self-adhesive coated electromagnetic steel sheet of each example has better bonding strength. Next, in Comparative Example 4, too much wax dispersion liquid (E) causes the degree of cross-linking of the chemical structure of the self-adhesive coating film to be deteriorated, and the adhesive strength of the self-adhesive coating film is deteriorated. In addition, in Comparative Example 5, too many particles of the nanocolloid (C) caused aggregation and sedimentation, thereby reducing the bonding strength.

To sum up, the self-adhesive coating composition and the manufacturing method of the self-adhesive coating of the present invention are applied, wherein the nanocolloid solution (C), the silane coupling agent (D) and the wax dispersion liquid with specific contents are applied. (E) It can make the self-adhesive coated electromagnetic steel sheet have good lubricity, insulation and corrosion resistance, and make the laminated iron core have good bonding strength.

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: Method 110, 120: 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 coating film according to an embodiment of the present invention.

100: Method

110, 120: Steps

Claims (10)

A self-adhesive coating composition, comprising: Water-based hydroxyl-containing resin (A), wherein the water-based hydroxyl-containing resin (A) is selected from the group consisting of polyurethane resin (A1), polyester polyol resin (A2), methacrylic resin (A3), hydroxyl-modified epoxy resin A group consisting of resin (A4) and any combination thereof; An aqueous hardener (B), wherein the aqueous hardener (B) comprises a carbodiimide compound; Nanocolloid solution (C); Silane coupling agent (D); and Wax dispersion (E), wherein the wax dispersion (E) comprises polyethylene-modified water-based emulsifying wax (E1) and/or water-based Teflon (poly(tera-fluoroethene), PTFE) emulsifying wax (E2), Wherein according to a content of the water-based hydroxyl-containing resin (A) is 100 parts by weight, a content of the nanocolloid solution (C) is 2 parts by weight to less than 13 parts by weight, and a content of the wax dispersion (E) is 0.1 part by weight to 0.5 part by weight. The self-adhesive coating composition according to claim 1, wherein the silane coupling agent (D) comprises an aminosilane compound (D1) and/or an epoxysilane compound (D2). The self-adhesive film composition according to claim 1, wherein the content of the water-based hydroxyl-containing resin (A) is 100 parts by weight, and the content of one of the water-based hardeners (B) is 5 parts by weight to 20 parts by weight share. The self-adhesive coating composition 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 silane coupling agent (D) is 0.1 parts by weight to 2 parts by weight share. The self-adhesive coating film composition according to claim 1, wherein the hydroxyl value of the water-based hydroxyl-containing resin (A) is 50 mgKOH/g to 400 mgKOH/g. The self-adhesive coating composition according to claim 1, wherein the weight ratio of the silane coupling agent (D) to the nanocolloid solution (C) is 1:1 to 1:15. The self-adhesive coating composition according to claim 1, wherein the weight ratio of the silane coupling agent (D) to the water-based hardener (B) is 1:5 to 1:20. The self-adhesive coating composition according to claim 1, wherein the weight ratio of the amino silane compound (D1) to the epoxy silane compound (D2) is 1.0:0.5 to 1.0:3.0. A method for manufacturing a self-adhesive coating film, comprising: Carrying out a coating process on the self-adhesive coating film composition according to any one of claims 1 to 8 to form a coating film; and The coating film is baked at a baking temperature to obtain the self-adhesive coating film, wherein the baking temperature is greater than 150°C to less than 330°C. A self-adhesive coating film, prepared by the method for manufacturing a self-adhesive coating film as claimed in claim 9, wherein the self-adhesive coating film after baking has a thickness, and the thickness is greater than 0.8 μm to Less than or equal to 5.5 μm.

Images