High-temperature-resistant epoxy powder coating for sealing flat wire motor terminal and production method of high-temperature-resistant epoxy powder coating

Abstract

The invention discloses a high-temperature-resistant epoxy powder coating for sealing a flat wire motor terminal. The high-temperature-resistant epoxy powder coating is characterized by comprising the following components in parts by weight: 40-55 parts of solid epoxy resin, 2-6 parts of a curing agent, 0.1-0.3 part of an accelerant, 35-55 parts of filler, 3-8 parts of an auxiliary agent and 2-5 parts of pigment, the solid epoxy resin is composed of modified high-temperature-resistant epoxy resin or / and standard solid epoxy resin. The production method of the high-temperature-resistant epoxy powder coating for sealing the flat wire motor terminal comprises the following steps: proportioning and mixing the raw materials according to the ratio, putting the mixed powder into a double-screw extruder, carrying out melt extrusion at 95-105 DEG C, cooling, and grinding into powder, thereby obtaining the high-temperature-resistant epoxy powder coating for sealing the flat wire motor terminal. The prepared high-temperature-resistant epoxy powder coating for sealing the flat wire motor terminal has the characteristics of high temperature resistance, good impact resistance, high adhesive force, high shear strength, high tracking index and the like, is good in performance, can meet the sealing requirement of the flat wire motor terminal, and is high in practicability.

Description

Technical Field

[0001] The invention belongs to powder coating and its preparation, and relates to a high temperature resistant epoxy powder coating for sealing flat wire motor terminals and its production method. The high temperature resistant epoxy powder coating of the invention (prepared) is particularly suitable for sealing flat wire motor terminals. Background Art

[0002] Flat wire motors have the characteristics of high slot fill rate and high power density, and are suitable for use in high-power motors. The production method of flat wire motors is generally to make the flat wire into a hairpin, insert it into the silicon steel sheet slot, and then use laser to weld the wire ends. When the insulation layer of the welding part is damaged, it is necessary to use insulating paint to cover it for insulation.

[0003] Generally, insulating coatings are of two types: liquid and powder. Among them, liquid insulating resin is applied by dripping. The motor stator is rotated, and the liquid insulating paint is dripped on the welding part, and then heated and cured. This method wastes a lot of resin, takes a long time to form, and is not environmentally friendly. Powder coating is applied by dipping in a fluidized barrel. It is one of the most economical and environmentally friendly production methods and is suitable for large-scale continuous production. The product has the characteristics of strong adhesion, excellent electrical properties, and high temperature resistance, which can meet the application of new energy flat wire motors.

[0004] The powder coating used to seal the flat wire motor terminals is dipped in a fluidized barrel. The powder coating needs to have a high softening point to avoid agglomeration during transportation and storage. It needs to have high temperature resistance, excellent adhesion, and high impact toughness. In this application, the multifunctional high temperature resistant epoxy resin used alone has poor adhesion, high brittleness, and is prone to cracking and falling off under hot and cold shocks. When used in combination, a large ratio will affect the surface quality of the paint film, and a small ratio will not meet the requirements for the glass transition temperature of the paint film.

[0005] Currently, there are only two suppliers of powder coatings for sealing flat wire motor terminals, namely a Japanese company and an American company. Both companies have problems with cracking caused by high-temperature baking and cracking caused by oil-compatible hot and cold cycles.

[0006] In the prior art, CN111187555A discloses "a high temperature resistant epoxy powder coating and its preparation method". Its technical solution is to add an inert hyperbranched high temperature resistant substance to the liquid epoxy resin E-44, which belongs to the physical addition type. In the powder coating manufacturing process, liquid epoxy brings troubles to the manufacturing process. In addition, the curing agent uses diethylenetriamine, which is a room temperature curing agent. After mixing with the liquid epoxy resin, it will cure at room temperature and cure faster at high temperature. Therefore, this technical solution is not suitable for epoxy powder coating. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and provide a high temperature resistant epoxy powder coating for sealing flat wire motor terminals and a production method thereof. Thus, a high temperature resistant epoxy powder coating and a production method thereof are provided which have the advantages of high temperature resistance (H grade), good impact resistance (1kg hammer, reaching 45cm), high adhesion (0 grade), high shear strength (32MPa), high tracking index (575V), etc.

[0008] The content of the present invention is: a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, characterized in that it comprises the following components by weight: 40-55 parts of solid epoxy resin, 2-6 parts of curing agent, 0.1-0.3 parts of accelerator, 35-55 parts of filler, 3-8 parts of auxiliary agent, and 2-5 parts of pigment;

[0009] The solid epoxy resin is composed of modified high temperature resistant epoxy resin and standard solid epoxy resin;

[0010] The modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin;

[0011] The standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0012] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0013] The accelerator is one or a mixture of two of imidazole (the product manufacturer and model can be: Guangzhou Deli Chemical Co., Ltd.), 2-methylimidazole (the product manufacturer and model can be: Lu'an Jietongda New Materials Co., Ltd., SA316);

[0014] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0015] The auxiliary agents include defoamers and leveling agents;

[0016] The pigment is one or a mixture of two or more of titanium dioxide (preferably rutile titanium dioxide), carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like, and is matched according to color mixing requirements.

[0017] The content of the present invention can also be: a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, which is prepared by mixing, melt-extruding, cooling and then grinding the component raw materials of 40 to 55 parts of solid epoxy resin, 2 to 6 parts of curing agent, 0.1 to 0.3 parts of accelerator, 35 to 55 parts of filler, 3 to 8 parts of auxiliary agent and 2 to 5 parts of pigment by weight.

[0018] In the present invention, the amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane;

[0019] The acid anhydride curing agent can be selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride and trimellitic anhydride.

[0020] In the content of the present invention: the isocyanate-modified liquid epoxy resin product production and providing enterprise and model can be: DFE220 of Jiangsu Dongcai New Materials Co., Ltd.;

[0021] The product production and providing enterprise and model of the linear bisphenol A epoxy resin can be CYD-804L and CYD-805 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the bisphenol A novolac epoxy resin can be EMTE-200HH of Shandong Aimonte New Materials Co., Ltd., the product production and providing enterprise and model of the o-cresol novolac epoxy resin can be CYDCN-208 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the triglycidyl isocyanurate can be HT-708 of Huangshan Huahui Technology Co., Ltd., the product production and providing enterprise and model of the biphenyl epoxy resin can be HCE-YX4000 of Guangzhou Hengchuang New Materials Technology Co., Ltd., and the product production and providing enterprise and model of the glycidyl terephthalate can be FA-68 of Shanghai Institute of Organic Chemistry.

[0022] In the content of the present invention: the product production and providing enterprise and model of the benzoin can be Huangshan Huahui Technology Co., Ltd. HA501, and the product production and providing enterprise and model of the silicon dioxide adsorbed polyacrylate can be Huangshan Huahui Technology Co., Ltd. HL988.

[0023] Another aspect of the present invention is: a method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, characterized in that the steps are:

[0024] a. Ingredients: Take the raw materials of each component according to the weight ratio of 40-55 parts of solid epoxy resin, 2-6 parts of curing agent, 0.1-0.3 parts of accelerator, 35-55 parts of filler, 3-8 parts of auxiliary agent and 2-5 parts of pigment, crush them and set aside;

[0025] The solid epoxy resin may be composed of a modified high temperature resistant epoxy resin and a standard solid epoxy resin;

[0026] The modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin;

[0027] The standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0028] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0029] The accelerator is one or a mixture of two of imidazole (the product manufacturer and model can be: Guangzhou Deli Chemical Co., Ltd.), 2-methylimidazole (the product manufacturer and model can be: Lu'an Jietongda New Materials Co., Ltd., SA316);

[0030] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0031] The auxiliary agents include defoamers and leveling agents;

[0032] The pigment is one or a mixture of two or more of rutile titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like, and is matched according to the color mixing requirements;

[0033] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0034] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 95-105°C, and cool to obtain an extruded material;

[0035] d. Grind the extruded material (through the vertical mill) into powder with an average particle size (D50) of 60-70 μm, and obtain the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal. The best way to store the high temperature resistant epoxy powder coating for the flat wire is to seal it in a plastic bag and store it in a cool and dry warehouse below 25°C.

[0036] In another aspect of the present invention: the amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane;

[0037] The acid anhydride curing agent can be selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride and trimellitic anhydride.

[0038] In another aspect of the present invention, it is characterized in that: the isocyanate-modified liquid epoxy resin product production and providing enterprise and model can be: DFE220 of Jiangsu Dongcai New Materials Co., Ltd.;

[0039] The product production and providing enterprise and model of the linear bisphenol A epoxy resin can be CYD-804L and CYD-805 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the bisphenol A novolac epoxy resin can be EMTE-200HH of Shandong Aimonte New Materials Co., Ltd., the product production and providing enterprise and model of the o-cresol novolac epoxy resin can be CYDCN-208 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the triglycidyl isocyanurate can be HT-708 of Huangshan Huahui Technology Co., Ltd., the product production and providing enterprise and model of the biphenyl epoxy resin can be HCE-YX4000 of Guangzhou Hengchuang New Materials Technology Co., Ltd., and the product production and providing enterprise and model of the glycidyl terephthalate can be FA-68 of Shanghai Institute of Organic Chemistry.

[0040] In another aspect of the present invention: the benzoin product production and providing enterprise and model can be Huangshan Huahui Technology Co., Ltd. HA501, the silicon dioxide adsorbed polyacrylate product production and providing enterprise and model can be Huangshan Huahui Technology Co., Ltd. HL988.

[0041] Performance test: Place the prepared high temperature resistant epoxy powder coating in a fluidized barrel and adjust the airflow to make the powder coating flow. Place a 100mm×100mm×1mm cold rolled steel plate in a 180℃ oven and heat it for 30 minutes. Take out the heated steel plate and quickly immerse it in the fluidized powder coating. Take it out after 1 second and dip it continuously for 2-3 times. Then place the dipped steel plate in a 180~190℃ oven and bake it for 15min~20min to cure. The paint film thickness is 0.3-0.5mm. The performance standards of the test are shown in Table 1 below.

[0042] Table 1: Performance standards for high temperature resistant epoxy powder coatings used for sealing flat wire motor terminals:

[0043]

[0044] When using, in order to achieve the sealing of the flat wire motor terminal, the liquid resin dripping process and the epoxy powder coating heating dipping process can be used. However, the epoxy powder coating dipping process has the advantages of convenience, speed and clean environment.

[0045] Compared with the prior art, the present invention has the following characteristics and beneficial effects:

[0046] (1) The present invention is used to modify the high temperature resistant epoxy resin, i.e., the isocyanate modified liquid epoxy resin, which has a compound containing oxazolidinone in its molecular structure and has good heat resistance. After curing with dicyandiamide, the glass transition temperature of the resin can reach 147°C (the glass transition temperature of the powder coating prepared by the existing bisphenol A type epoxy is about 106°C). After rapid heat aging at 220°C, the heat resistance grade of the paint film is H grade, which fully meets the requirements of the sealing dip coating process and performance of the flat wire motor terminal. Since the modified solid epoxy resin is a linear bifunctional epoxy resin with small steric hindrance, the prepared powder coating has a low curing temperature under the action of the accelerator, which can achieve a temperature of 130°C and 40-80°C. MIN Curing or temperature 180 ℃, 10-15MIN curing; due to the long molecular chain of the modified resin, the toughness of the paint film after curing with the curing agent is good, the prepared powder coating is electrostatically sprayed on a 0.5mm cast iron plate, the spraying thickness is 0.08-0.12mm, 180 ℃, 15 minutes after curing, the cast iron plate after the coating is cured is cooled to room temperature, and then the iron plate is folded in half to observe whether the paint film has cracking. The paint film prepared by the present invention has no cracks after folding in half, while the powder coating coating used for sealing the flat wire motor terminal in the prior art will produce obvious cracks after folding in half; the high temperature resistant epoxy powder coating prepared by the present invention is used in flat wire motors. After 8 cycles of high and low temperature (-45 ℃ ~ 155 ℃) impact treatment in oil, the coating will not crack or fall off. After the tensile shearing strips and the square plate strips coated with the powder coating are subjected to high and low temperature impact treatment, the shear strength and electrical strength retention rate can reach more than 90%.

[0047] (2) The high temperature resistant epoxy powder coating for sealing the flat wire motor terminal prepared by the present invention can effectively solve the problems of high temperature baking cracking and high and low temperature cycle cracking in oil by improving the heat resistance of the resin and increasing the toughness of the resin; it has excellent anti-leakage tracking performance, which can reach more than 500V; the heat resistance grade of the high temperature resistant epoxy powder coating prepared by the present invention can reach H grade;

[0048] (3) The preparation process of the product of the present invention is simple and the process is convenient. The high temperature resistant epoxy powder coating product prepared by the present invention has been subjected to 8 cycles of hot and cold oil shock test at -45°C to 155°C and long-term hot and cold cycle test at -40°C to 180°C, as well as 2000 hours of oil resistance test at 150°C, and can fully meet the application requirements of flat wire motor terminal sealing. DETAILED DESCRIPTION

[0049] The following embodiments are intended to further illustrate the present invention, but should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0050] The "parts" of each component in the following examples are all parts by weight (all in kilograms).

[0051] Embodiment 1:

[0052] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0053] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 4.4 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0054] The solid epoxy resin is a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.);

[0055] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0056] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0057] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0058] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0059] Embodiment 2:

[0060] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0061] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 4.28 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0062] The solid epoxy resin is composed of 90% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 10% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0063] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0064] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0065] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0066] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0067] Embodiment 3:

[0068] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0069] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 4 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0070] The solid epoxy resin is composed of 80% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 20% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0071] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0072] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0073] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0074] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0075] Embodiment 4:

[0076] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0077] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 3.7 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0078] The solid epoxy resin is composed of 70% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 30% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0079] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0080] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0081] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0082] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0083] Embodiment 5:

[0084] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0085] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 3.4 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0086] The solid epoxy resin is composed of 60% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 40% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0087] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0088] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0089] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0090] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0091] Embodiment 6:

[0092] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0093] a. Ingredients: Take the raw materials of each component according to the weight ratio of 53.5 parts of solid epoxy resin, 3.2 parts of curing agent dicyandiamide, 0.2 parts of accelerator 2-methylimidazole, 39 parts of filler (silicon powder, average particle size of 5 μm), 3.8 parts of auxiliary agent, and 3 parts of pigment (2.9 parts of rutile titanium dioxide and 0.1 parts of carbon black), and crush them for use;

[0094] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 50% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0095] The auxiliary agent is composed of 2 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.8 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0096] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0097] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0098] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0099] Embodiment 7:

[0100] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0101] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 3.54 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0102] The solid epoxy resin is a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.);

[0103] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0104] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0105] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0106] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0107] Embodiment 8:

[0108] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0109] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 3.44 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0110] The solid epoxy resin is composed of 90% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 10% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0111] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0112] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0113] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0114] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0115] Embodiment 9:

[0116] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0117] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 3.22 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0118] The solid epoxy resin is composed of 80% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 20% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0119] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0120] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0121] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0122] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0123] Embodiment 10:

[0124] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0125] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 3 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0126] The solid epoxy resin is composed of 70% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 30% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0127] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0128] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0129] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0130] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0131] Embodiment 11:

[0132] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0133] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.77 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0134] The solid epoxy resin is composed of 60% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 40% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0135] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0136] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0137] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0138] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0139] Embodiment 12:

[0140] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0141] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.54 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0142] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.) and 50% by weight of a standard solid epoxy resin (a linear bisphenol A epoxy resin, specifically CYD-804L epoxy resin produced by Yueyang Petrochemical);

[0143] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0144] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0145] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0146] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0147] Embodiment 13:

[0148] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0149] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.62 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0150] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.), 50% by weight of a standard solid epoxy resin [40% by weight of a linear bisphenol A epoxy resin (specifically CYD-804L epoxy resin produced by Yueyang Petrochemical) and 10% by weight of a bisphenol A novolac epoxy resin (specifically EMTE-200HH epoxy resin produced by Shandong Aimonte New Materials)];

[0151] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0152] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0153] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0154] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0155] Embodiment 14:

[0156] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0157] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.68 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0158] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.), 50% by weight of a standard solid epoxy resin [35% by weight of a linear bisphenol A epoxy resin (specifically CYD-804L epoxy resin produced by Yueyang Petrochemical) and 15% by weight of a bisphenol A novolac epoxy resin (specifically EMTE-200HH epoxy resin produced by Shandong Aimonte New Materials)];

[0159] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0160] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0161] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0162] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0163] Embodiment 15:

[0164] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0165] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.75 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.4 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0166] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.), 50% by weight of a standard solid epoxy resin [30% by weight of a linear bisphenol A epoxy resin (specifically CYD-804L epoxy resin produced by Yueyang Petrochemical) and 20% by weight of a bisphenol A novolac epoxy resin (specifically EMTE-200HH epoxy resin produced by Shandong Aimonte New Materials)];

[0167] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0168] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0169] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0170] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0171] Embodiment 16:

[0172] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0173] a. Ingredients: Take the raw materials of each component according to the weight ratio of 43 parts of solid epoxy resin, 2.84 parts of curing agent dicyandiamide, 0.16 parts of accelerator 2-methylimidazole, 50 parts of filler (silicon powder, average particle size of 5 μm), 3 parts of auxiliary agent, and 2.5 parts of pigment (2.42 parts of rutile titanium dioxide and 0.08 parts of carbon black), and crush them for use;

[0174] The solid epoxy resin is composed of 50% by weight of a modified high temperature resistant epoxy resin (an isocyanate modified liquid epoxy resin, specifically DFE220 produced by Jiangsu Dongcai New Materials Co., Ltd.), 50% by weight of a standard solid epoxy resin [25% by weight of a linear bisphenol A epoxy resin (specifically CYD-804L epoxy resin produced by Yueyang Petrochemical) and 25% by weight of a bisphenol A novolac epoxy resin (specifically EMTE-200HH epoxy resin produced by Shandong Aimonte New Materials)];

[0175] The auxiliary agent is composed of 1.8 parts by weight of a leveling agent (polyacrylate adsorbed by silicon dioxide, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HL988) and 1.2 parts by weight of a defoaming agent (benzoin, the product manufacturer and model is: Huangshan Huahui Technology Co., Ltd. HA501);

[0176] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0177] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 100±5℃, and cool to obtain an extruded material;

[0178] d. Grind the extruded material through a vertical mill into a powder with an average particle size (D50) of 60 to 70 μm, which is the high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0179] The best way to preserve the high temperature resistant epoxy powder coatings for sealing flat wire motor terminals obtained in the above embodiments 1-16 is to seal them in plastic bags and store them in a cool and dry warehouse below 25°C.

[0180] The high temperature resistant epoxy powder coating for sealing the flat wire motor terminals obtained in the above-mentioned embodiments 1-16 can be used by electrostatic spraying or dipping process. Electrostatic spraying refers to the connection of negative high voltage static electricity to the gun head of the electrostatic spray gun. When the voltage reaches a high enough level, the air in the area near the gun head produces a strong corona discharge to form a gas ion area. When the paint particles atomized by the electrostatic spray gun are in this area, the atomized particles of the paint are negatively charged. The workpiece to be painted is suspended on a grounded conveyor line, and there is a positive charge on the surface of the workpiece. According to the electrostatic principle that opposite charges attract, the negatively charged paint mist particles move to the opposite working surface, are adsorbed and deposited on the workpiece surface, forming a uniform and dense paint film, and the workpiece is painted.

[0181] The dip coating process is to pour the powder coating into a barrel with compressed air, adjust the air flow, and make the powder flow without splashing. Then heat the workpiece to 150-180℃, and then immerse the heated workpiece to be coated in the flowing powder. The powder coating will melt when it encounters the hot workpiece and stick to the surface of the workpiece. Generally, the dip coating is done 2-3 times, each time for 1-2 seconds, to get a 0.3-0.5MM thick coating. After baking at 190℃ for 15-20 minutes, the powder coating is solidified, and the dip coating process is completed.

[0182] Performance Test:

[0183] The test performance of the sample produced by the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal obtained in the above embodiments 1-16 through multiple dipping processes is shown in the following Table 2-4:

[0184] Table 2:

[0185]

[0186] Table 3:

[0187]

[0188] Table 4:

[0189]

[0190] Embodiment 17:

[0191] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals comprises the following components by weight: 40 parts of solid epoxy resin, 2 parts of curing agent, 0.1 parts of accelerator, 35 parts of filler, 3 parts of auxiliary agent and 2 parts of pigment.

[0192] Embodiment 18:

[0193] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals comprises the following components by weight: 55 parts of solid epoxy resin, 6 parts of curing agent, 0.3 parts of accelerator, 55 parts of filler, 8 parts of auxiliary agent and 5 parts of pigment.

[0194] Embodiment 19:

[0195] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals comprises the following components by weight: 47 parts of solid epoxy resin, 4 parts of curing agent, 0.2 parts of accelerator, 45 parts of filler, 5 parts of auxiliary agent and 3 parts of pigment.

[0196] Embodiment 20:

[0197] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals is prepared by mixing 40 parts of solid epoxy resin, 2 parts of curing agent, 0.1 part of accelerator, 35 parts of filler, 3 parts of auxiliary agent and 2 parts of pigment by weight, melting and extruding in an extruder, cooling and then grinding.

[0198] Embodiment 21:

[0199] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals is prepared by mixing 55 parts of solid epoxy resin, 6 parts of curing agent, 0.3 parts of accelerator, 55 parts of filler, 8 parts of auxiliary agent and 5 parts of pigment by weight, melting and extruding in an extruder, cooling and then grinding.

[0200] Embodiment 22:

[0201] A high temperature resistant epoxy powder coating for sealing flat wire motor terminals is prepared by mixing 48 parts of solid epoxy resin, 4 parts of curing agent, 0.2 parts of accelerator, 45 parts of filler, 5.5 parts of auxiliary agent and 3.5 parts of pigment by weight, melt-extruding in an extruder, cooling and then grinding.

[0202] In the above-mentioned embodiments 17-22:

[0203] The solid epoxy resin may be composed of a modified high temperature resistant epoxy resin and / or a standard solid epoxy resin;

[0204] The modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin;

[0205] The standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0206] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0207] The accelerator is one or a mixture of imidazole and 2-methylimidazole;

[0208] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0209] The auxiliary agents include defoamers and leveling agents;

[0210] The pigment is one or a mixture of two or more of rutile titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like, and is matched according to color mixing needs.

[0211] The amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane;

[0212] The acid anhydride curing agent is selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride and trimellitic anhydride;

[0213] The isocyanate-modified liquid epoxy resin is produced by: DFE220 of Jiangsu Dongcai New Materials Co., Ltd.

[0214] The product production and providing enterprise and model of the linear bisphenol A epoxy resin can be CYD-804L and CYD-805 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the bisphenol A novolac epoxy resin can be EMTE-200HH of Shandong Aimonte New Materials Co., Ltd., the product production and providing enterprise and model of the o-cresol novolac epoxy resin can be CYDCN-208 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the triglycidyl isocyanurate can be HT-708 of Huangshan Huahui Technology Co., Ltd., the product production and providing enterprise and model of the biphenyl epoxy resin can be HCE-YX4000 of Guangzhou Hengchuang New Materials Technology Co., Ltd., and the product production and providing enterprise and model of the glycidyl terephthalate can be FA-68 of Shanghai Institute of Organic Chemistry.

[0215] The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

[0216] Embodiment 23:

[0217] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0218] a. Ingredients: Take the raw materials of each component according to the weight ratio of 40 parts of solid epoxy resin, 2 parts of curing agent, 0.1 parts of accelerator, 35 parts of filler, 3 parts of auxiliary agent and 2 parts of pigment, crush them and set aside;

[0219] The solid epoxy resin may be composed of a modified high temperature resistant epoxy resin and / or a standard solid epoxy resin; the modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin; the standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0220] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0221] The accelerator is one or a mixture of imidazole and 2-methylimidazole;

[0222] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0223] The auxiliary agents include defoamers and leveling agents;

[0224] The pigment is one or a mixture of two or more of rutile titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like;

[0225] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0226] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at 95°C, and cool to obtain an extruded material;

[0227] d. Grind the extruded material (through a vertical mill) into powder with an average particle size (D50) of 60 μm, thereby obtaining a high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0228] Embodiment 24:

[0229] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0230] a. Ingredients: Take the raw materials of each component according to the weight ratio of 55 parts of solid epoxy resin, 6 parts of curing agent, 0.3 parts of accelerator, 55 parts of filler, 8 parts of auxiliary agent and 5 parts of pigment, crush them and set aside;

[0231] The solid epoxy resin may be composed of a modified high temperature resistant epoxy resin and / or a standard solid epoxy resin; the modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin; the standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0232] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0233] The accelerator is one or a mixture of imidazole and 2-methylimidazole;

[0234] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0235] The auxiliary agents include defoamers and leveling agents;

[0236] The pigment is one or a mixture of two or more of rutile titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like;

[0237] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0238] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at 105°C, and cool to obtain an extruded material;

[0239] d. Grind the extruded material (through a vertical mill) into powder with an average particle size (D50) of 70 μm, thereby obtaining a high-temperature resistant epoxy powder coating for sealing flat wire motor terminals.

[0240] Embodiment 25:

[0241] A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, comprising the following steps:

[0242] a. Ingredients: Take the raw materials of each component according to the weight ratio of 48 parts of solid epoxy resin, 4 parts of curing agent, 0.2 parts of accelerator, 45 parts of filler, 5.5 parts of auxiliary agent and 3.3 parts of pigment, crush them and set aside;

[0243] The solid epoxy resin may be composed of a modified high temperature resistant epoxy resin and / or a standard solid epoxy resin; the modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin; the standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate;

[0244] The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent;

[0245] The accelerator is one or a mixture of imidazole and 2-methylimidazole;

[0246] The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder;

[0247] The auxiliary agents include defoamers and leveling agents;

[0248] The pigment is one or a mixture of two or more of rutile titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like, and is matched according to the color mixing requirements;

[0249] b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion (stirring) for 5 minutes to obtain a mixed powder;

[0250] c. Pour the mixed powder into a twin-screw extruder, melt and extrude at 100°C, and cool to obtain an extruded material;

[0251] d. Grind the extruded material (through the vertical mill) into powder with an average particle size (D50) of 65 μm, and obtain the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal. The best way to store the high temperature resistant epoxy powder coating for the flat wire is to seal it in a plastic bag and store it in a cool and dry warehouse below 25°C.

[0252] In the above-mentioned embodiments 23-25:

[0253] The amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane; the anhydride curing agent is selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride, and trimellitic anhydride;

[0254] The isocyanate-modified liquid epoxy resin product production and providing enterprise and model can be: DFE220 of Jiangsu Dongcai New Materials Co., Ltd.;

[0255] The product production and providing enterprise and model of the linear bisphenol A epoxy resin can be CYD-804L and CYD-805 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the bisphenol A novolac epoxy resin can be EMTE-200HH of Shandong Aimonte New Materials Co., Ltd., the product production and providing enterprise and model of the o-cresol novolac epoxy resin can be CYDCN-208 of Sinopec Hunan Petrochemical Co., Ltd., the product production and providing enterprise and model of the triglycidyl isocyanurate can be HT-708 of Huangshan Huahui Technology Co., Ltd., the product production and providing enterprise and model of the biphenyl epoxy resin can be HCE-YX4000 of Guangzhou Hengchuang New Materials Technology Co., Ltd., and the product production and providing enterprise and model of the glycidyl terephthalate can be FA-68 of Shanghai Institute of Organic Chemistry.

[0256] The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

[0257] The performance of the powder coatings obtained in the present invention and the above embodiments differs only in the glass transition temperature, the lowest glass transition temperature is 128°C, and the highest glass transition temperature is 168°C. Other properties are similar and can meet the performance and process requirements for sealing flat wire motor terminals.

[0258] In the above embodiments: the percentages used, unless otherwise specified, are all weight (mass) percentages or percentages known to those skilled in the art; the proportions used, unless otherwise specified, are all weight (mass) proportions; and the weights may be in grams or kilograms.

[0259] In the above embodiments, the process parameters (temperature, time, particle size, etc.) in each step and the numerical values ​​of the amounts of each component are ranges, and any point can be applied.

[0260] The technical contents not specifically described in the present invention and the above embodiments are the same as the prior art, and the raw materials are all commercially available products.

[0261] The present invention is not limited to the above embodiments, and all of the contents of the present invention can be implemented and have the above good effects.

Claims

1. A high temperature resistant epoxy powder coating for sealing flat wire motor terminals, characterized in that The components include the following by weight: 40-55 parts of solid epoxy resin, 2-6 parts of curing agent, 0.1-0.3 parts of accelerator, 35-55 parts of filler, 3-8 parts of auxiliary agent, and 2-5 parts of pigment; The solid epoxy resin is composed of modified high temperature resistant epoxy resin and / or standard solid epoxy resin; The modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin; The standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate; The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent; The accelerator is one or a mixture of imidazole and 2-methylimidazole; The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder; The auxiliary agents include defoamers and leveling agents; The pigment is one or a mixture of two or more pigments selected from titanium dioxide, carbon black, yellow iron oxide, phthalocyanine blue, phthalocyanine green, red iron oxide and the like.

2. The high temperature resistant epoxy powder coating for sealing flat wire motor terminals according to claim 1, characterized in that: The amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane; The acid anhydride curing agent is selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride and trimellitic anhydride.

3. The high temperature resistant epoxy powder coating for sealing flat wire motor terminals according to claim 1 or 2, characterized in that: The isocyanate-modified liquid epoxy resin is produced by: DFE220 of Jiangsu Dongcai New Materials Co., Ltd. The production and providing enterprise and model of the linear bisphenol A epoxy resin are Yueyang Petrochemical CYD-804L and Yueyang Petrochemical CYD-805, the production and providing enterprise and model of the bisphenol A novolac epoxy resin is Shandong Aimonte New Materials EMTE-200HH, the production and providing enterprise and model of the o-cresol novolac epoxy resin is Yueyang Petrochemical CYDCN-208, the production and providing enterprise and model of the triglycidyl isocyanurate is Huangshan Huahui HT-708, the production and providing enterprise and model of the biphenyl epoxy resin is Guangzhou Hengchuang New Materials Technology Co., Ltd. HCE-YX4000, and the production and providing enterprise and model of the glycidyl terephthalate is Shanghai Institute of Organic Chemistry FA-68.

4. The high temperature resistant epoxy powder coating for sealing flat wire motor terminals according to claim 1 or 2, characterized in that: The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

5. The high temperature resistant epoxy powder coating for sealing flat wire motor terminals according to claim 3, characterized in that: The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

6. A method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals, characterized in that The steps are: a. Ingredients: Take the raw materials of each component according to the weight ratio of 40-55 parts of solid epoxy resin, 2-6 parts of curing agent, 0.1-0.3 parts of accelerator, 35-55 parts of filler, 3-8 parts of auxiliary agent and 2-5 parts of pigment, crush them and set aside; The solid epoxy resin is composed of modified high temperature resistant epoxy resin and / or standard solid epoxy resin; The modified high temperature resistant epoxy resin is an isocyanate modified liquid epoxy resin; The standard solid epoxy resin is one or a mixture of two or more of linear bisphenol A epoxy resin, bisphenol A novolac epoxy resin, o-cresol novolac epoxy resin, triglycidyl isocyanurate, biphenyl epoxy resin, and glycidyl terephthalate; The curing agent is one or a mixture of two or more of an amine curing agent, a phenolic curing agent, and an acid anhydride curing agent; The accelerator is one or a mixture of imidazole and 2-methylimidazole; The filler is one or a mixture of two or more of silicon micropowder, wollastonite, barium sulfate, calcium carbonate, aluminum hydroxide, mica powder, and talcum powder; The auxiliary agents include defoamers and leveling agents; The pigment is one or a mixture of two or more of titanium dioxide, carbon black, iron oxide yellow, phthalocyanine blue, phthalocyanine green, iron oxide red and the like; b. Mixing: Put solid epoxy resin, curing agent, accelerator, filler, additive and pigment into a mixer for high-speed dispersion for 5 to 10 minutes to obtain a mixed powder; c. Pour the mixed powder into a twin-screw extruder, melt and extrude at a temperature of 95-105°C, and cool to obtain an extruded material; d. Grind the extruded material into powder with an average particle size of 60 to 70 μm, thereby obtaining a high temperature resistant epoxy powder coating for sealing flat wire motor terminals.

7. The method for producing the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal according to claim 6, characterized in that: The amine curing agent is selected from one or a mixture of two or more of dicyandiamide, dapsone DDS, diaminodiphenylmethane, and diaminotriphenylmethane; The acid anhydride curing agent is selected from one or a mixture of two or more of phthalic anhydride, maleic anhydride and trimellitic anhydride.

8. The method for producing the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal according to claim 6 or 7, characterized in that: The isocyanate-modified liquid epoxy resin is produced by: DFE220 of Jiangsu Dongcai New Materials Co., Ltd. The production and providing enterprise and model of the linear bisphenol A epoxy resin are Yueyang Petrochemical CYD-804L and Yueyang Petrochemical CYD-805, the production and providing enterprise and model of the bisphenol A novolac epoxy resin is Shandong Aimonte New Materials EMTE-200HH, the production and providing enterprise and model of the o-cresol novolac epoxy resin is Yueyang Petrochemical CYDCN-208, the production and providing enterprise and model of the triglycidyl isocyanurate is Huangshan Huahui HT-708, the production and providing enterprise and model of the biphenyl epoxy resin is Guangzhou Hengchuang New Materials Technology Co., Ltd. HCE-YX4000, and the production and providing enterprise and model of the glycidyl terephthalate is Shanghai Institute of Organic Chemistry FA-68.

9. The method for producing a high temperature resistant epoxy powder coating for sealing flat wire motor terminals according to claim 6 or 7, characterized in that: The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

10. The method for producing the high temperature resistant epoxy powder coating for sealing the flat wire motor terminal according to claim 8, characterized in that: The benzoin product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HA501. The silicon dioxide adsorbed polyacrylate product is produced by Huangshan Huahui Technology Co., Ltd. and its model is HL988.

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