High-voltage resistant composite polyamide-imide enamelled round aluminium wire

Abstract

The present invention discloses a high-voltage resistant composite polyamideimide enamelled round aluminium wire, which comprises a conductor, a polyamideimide coating and a polyesterimide paint coating; the polyamideimide coating is prepared by the following steps: by weight, adding 50-60 parts of polyamideimide resin, 10-15 parts of functional filler and 2-5 parts of polyphenylene sulfide into 50-80 parts of N-methylpyrrolidone, heating to 45-60 °C, stirring evenly and then coating on the surface of the conductor, and curing to obtain the polyamideimide coating; the high-voltage resistant composite polyamideimide enamelled round aluminium wire is prepared by the following steps: evenly coating the surface of the round aluminium wire with polyamideimide paint to form a polyamideimide coating, then coating a polyesterimide coating, and curing to obtain the polyamideimide enamelled round aluminium wire, and finally coating a layer of surface lubricant on the surface of the polyamideimide enamelled round aluminium wire, so that the enamelled wire can be closely arranged during wire winding and is convenient for users to wind coils.

Description

Technical Field

[0001] The present invention relates to the field of enameled wires, and particularly to a high-voltage-resistant composite polyamide-imide enameled round aluminum wire. Background Art

[0002] Enameled wire is a main variety of winding wire, generally composed of a conductor and an insulating layer, and its application fields include inductance coils, electromagnetic coils, AC and DC motors, the automotive industry, etc. At present, the production of enameled wire mainly focuses on varieties such as polyester, polyurethane, and polyester-imide; among them, polyamide-imide enameled wire paint is a high-temperature-resistant enameled wire paint with excellent comprehensive performance and is one of the main varieties of high-temperature-resistant enameled wire paint above 200 grades in the world; it not only maintains the performance of high heat resistance and can be used for a long time at 200°C, but also has good mechanical properties, chemical corrosion resistance, and refrigerant resistance, and greatly improves the adhesion and flexibility to the conductor, and at the same time the wear resistance is also improved, and the mechanical properties of the paint film are well balanced. However, with the development of technology, the use environment of polyamide-imide enameled wire is becoming more and more demanding. Especially under high-temperature conditions, although polyamide-imide is not so easy to soften, its dielectric constant is relatively high, and it is easy to form a charge channel and cause breakdown. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a high-voltage-resistant composite polyamide-imide enameled round aluminum wire.

[0004] The object of the present invention can be achieved by the following technical solutions:

[0005] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire includes a conductor, a polyamide-imide coating, and a polyester-imide paint coating;

[0006] The polyamide-imide coating is prepared through the following steps:

[0007] By weight, 50-60 parts of polyamide-imide resin, 10-15 parts of functional filler, and 2-5 parts of polyphenylene sulfide are added to 50-80 parts of N-methylpyrrolidone, heated to 45-60°C, stirred evenly to obtain a polyamide-imide coating material, evenly coated on the surface of the conductor, and cured to obtain the polyamide-imide coating.

[0008] Further, the functional filler is prepared through the following steps:

[0009] Step S11: Add nano-silica into an ethanol aqueous solution with a volume fraction of 10%, add γ-(methacryloyloxy)propyltrimethoxysilane, heat up to 40 - 45 °C, stir evenly and react for 4 h. After the reaction, modified nano-silica is obtained. Control the dosage ratio of nano-silica, γ-(methacryloyloxy)propyltrimethoxysilane and ethanol aqueous solution to be 1 - 2 g∶0.3 - 0.5 g∶50 mL;

[0010] In step S11, the nano-silica is first modified by the silane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane. Through the hydrolysis of γ-(methacryloyloxy)propyltrimethoxysilane and the condensation with the hydroxyl groups on the surface of silica, a carbon-carbon double bond is then introduced onto the surface of the nano-silica;

[0011] Step S12: Add N-cyclohexylmaleimide and benzoyl peroxide into xylene, stir for 30 - 45 min, then add styrene, 4-allyloxy-2-hydroxybenzophenone and modified nano-silica in sequence. After stirring evenly, heat up to 100 - 105 °C, stir evenly and react for 4 - 6 h. After the reaction, functional filler is obtained. Control the dosage ratio of N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone and modified nano-silica to be 1 - 2 mmol∶2 - 4 mmol∶1 - 2 mmol∶1 - 1.2 g, and the dosage of benzoyl peroxide is 0.3 - 0.5% of the weight of N-cyclohexylmaleimide.

[0012] In step S12, N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone and modified nano-silica are used as monomers respectively, and polymerization occurs under the action of the initiator benzoyl peroxide on the surface of silica. Due to the heat-resistant characteristics of N-cyclohexylmaleimide itself, it can endow the matrix with excellent heat resistance in cooperation with styrene. Moreover, 4-allyloxy-2-hydroxybenzophenone is introduced. 4-allyloxy-2-hydroxybenzophenone can be used as an excellent voltage stabilizer to prevent the matrix from forming a charge channel and breakdown due to a relatively high dielectric constant under high-temperature conditions, thereby improving the high-voltage resistance performance of the enameled wire.

[0013] Further, the conductor is a round aluminum wire.

[0014] Further, the thickness of the polyesterimide coating is 1 - 3 mm.

[0015] Furthermore, the high-voltage-resistant composite polyamide-imide enameled round aluminum wire is made through the following steps: evenly coat the surface of the round aluminum wire with polyamide-imide coating to form a polyamide-imide coating layer, then coat a polyester-imide coating layer, and after curing, obtain the polyamide-imide enameled round aluminum wire. Finally, coat a layer of surface lubricant on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be closely arranged during wire winding and is convenient for users to wind coils.

[0016] Advantages of the present invention:

[0017] The present invention prepares a high-voltage-resistant composite polyamide-imide enameled round aluminum wire, which includes a conductor, a polyamide-imide coating layer, and a polyester-imide paint coating layer. The conductor is a round aluminum wire. By coating the surface of the conductor with polyamide-imide coating, excellent high-temperature and high-voltage resistance performance is imparted to the enameled wire. During the preparation process of the polyamide-imide coating, first, nano-silica is modified by silane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane. Through the hydrolysis of γ-(methacryloyloxy)propyltrimethoxysilane and the condensation with the hydroxyl groups on the surface of silica, carbon-carbon double bonds are then introduced onto the surface of nano-silica. N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica are used as monomers respectively, and under the action of initiator benzoyl peroxide, polymerization occurs on the surface of silica. Due to the heat-resistant characteristics of N-cyclohexylmaleimide itself, it can cooperate with styrene to endow the matrix with excellent heat resistance. Moreover, 4-allyloxy-2-hydroxybenzophenone is introduced. 4-allyloxy-2-hydroxybenzophenone can serve as an excellent voltage stabilizer to prevent the matrix from forming charge channels and breakdown due to a relatively high dielectric constant under high-temperature conditions, thereby improving the high-voltage resistance performance of the enameled wire. Specific embodiments

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0019] Example 1

[0020] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire includes a conductor, a polyamide-imide coating layer, and a polyester-imide paint coating layer;

[0021] The polyamide-imide coating layer is made through the following steps:

[0022] By weight, 50 parts of polyamide-imide resin, 10 parts of functional filler, and 2 parts of polyphenylene sulfide are added to 50 parts of N-methylpyrrolidone. The temperature is raised to 45 °C, and after stirring evenly, a polyamide-imide coating is prepared. It is evenly coated on the surface of the conductor and cured to obtain a polyamide-imide coating.

[0023] The functional filler is prepared through the following steps:

[0024] Step S11: Add nano-silica into an ethanol aqueous solution with a volume fraction of 10%, add γ-(methacryloyloxy)propyltrimethoxysilane, raise the temperature to 40 °C, stir evenly and react for 4 h. After the reaction, modified nano-silica is obtained. Control the dosage ratio of nano-silica, γ-(methacryloyloxy)propyltrimethoxysilane, and ethanol aqueous solution to be 1 g∶0.3 g∶50 mL;

[0025] Step S12: Add N-cyclohexylmaleimide and benzoyl peroxide into xylene, stir for 30 min, then add styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica in sequence. After stirring evenly, raise the temperature to 100 °C, stir evenly and react for 4 h. After the reaction, a functional filler is obtained. Control the dosage ratio of N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica to be 1 mmol∶2 mmol∶1 mmol∶1 g, and the dosage of benzoyl peroxide is 0.3% of the weight of N-cyclohexylmaleimide.

[0026] The conductor is round aluminum wire.

[0027] The thickness of the polyester-imide coating is 1 mm.

[0028] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire is prepared through the following steps: The surface of the round aluminum wire is evenly coated with a polyamide-imide coating to form a polyamide-imide coating, and then a polyester-imide coating is coated. After curing, a polyamide-imide enameled round aluminum wire is obtained. Finally, a layer of surface lubricant is coated on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be closely arranged during wire winding and it is convenient for users to wind coils.

[0029] Example 2

[0030] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire includes a conductor, a polyamide-imide coating, and a polyester-imide paint coating;

[0031] The polyamide-imide coating is prepared through the following steps:

[0032] By weight, 55 parts of polyamide-imide resin, 12 parts of functional filler, and 3 parts of polyphenylene sulfide are added to 60 parts of N-methylpyrrolidone. The temperature is raised to 50 °C, and after stirring evenly, a polyamide-imide coating is prepared. It is evenly coated on the surface of the conductor and cured to obtain a polyamide-imide coating.

[0033] The functional filler is prepared through the following steps:

[0034] Step S11: Add nano-silica into an ethanol aqueous solution with a volume fraction of 10%, add γ-(methacryloyloxy)propyltrimethoxysilane, raise the temperature to 42 °C, stir evenly and react for 4 h. After the reaction ends, modified nano-silica is obtained. Control the dosage ratio of nano-silica, γ-(methacryloyloxy)propyltrimethoxysilane, and ethanol aqueous solution to be 1.5 g∶0.3 g∶50 mL;

[0035] Step S12: Add N-cyclohexylmaleimide and benzoyl peroxide into xylene, stir for 35 min, then add styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica in sequence. After stirring evenly, raise the temperature to 100 °C, stir evenly and react for 4 h. After the reaction ends, a functional filler is obtained. Control the dosage ratio of N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica to be 1.5 mmol∶3 mmol∶1.5 mmol∶1.1 g, and the dosage of benzoyl peroxide is 0.4% of the weight of N-cyclohexylmaleimide.

[0036] The conductor is round aluminum wire.

[0037] The thickness of the polyester-imide coating is 2 mm.

[0038] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire is prepared through the following steps: The surface of the round aluminum wire is evenly coated with a polyamide-imide coating to form a polyamide-imide coating, and then a polyester-imide coating is coated. After curing, a polyamide-imide enameled round aluminum wire is obtained. Finally, a layer of surface lubricant is coated on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be closely arranged during wire winding and it is convenient for users to wind coils.

[0039] Example 3

[0040] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire includes a conductor, a polyamide-imide coating, and a polyester-imide paint coating;

[0041] The polyamide-imide coating is prepared through the following steps:

[0042] By weight, 58 parts of polyamide-imide resin, 14 parts of functional filler, and 4 parts of polyphenylene sulfide are added to 70 parts of N-methylpyrrolidone. The temperature is raised to 55 °C, and after stirring evenly, a polyamide-imide coating is prepared. It is evenly coated on the surface of the conductor and cured to obtain a polyamide-imide coating.

[0043] The functional filler is prepared through the following steps:

[0044] Step S11: Add nano-silica into an ethanol aqueous solution with a volume fraction of 10%, add γ-(methacryloyloxy)propyltrimethoxysilane, raise the temperature to 45 °C, stir evenly and react for 4 h. After the reaction, modified nano-silica is obtained. Control the dosage ratio of nano-silica, γ-(methacryloyloxy)propyltrimethoxysilane, and ethanol aqueous solution to be 2 g∶0.5 g∶50 mL;

[0045] Step S12: Add N-cyclohexylmaleimide and benzoyl peroxide into xylene, stir for 45 min, then add styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica in sequence. After stirring evenly, raise the temperature to 105 °C, stir evenly and react for 6 h. After the reaction, the functional filler is obtained. Control the dosage ratio of N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica to be 1.5 mmol∶4 mmol∶1.5 mmol∶1.2 g, and the dosage of benzoyl peroxide is 0.5% of the weight of N-cyclohexylmaleimide.

[0046] The conductor is round aluminum wire.

[0047] The thickness of the polyester-imide coating is 3 mm.

[0048] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire is prepared through the following steps: The surface of the round aluminum wire is evenly coated with polyamide-imide coating to form a polyamide-imide coating, and then a polyester-imide coating is coated. After curing, the polyamide-imide enameled round aluminum wire is obtained. Finally, a surface lubricant is coated on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be closely arranged during wire winding and it is convenient for users to wind coils.

[0049] Example 4

[0050] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire includes a conductor, a polyamide-imide coating, and a polyester-imide paint coating;

[0051] The polyamide-imide coating is prepared through the following steps:

[0052] By weight, 60 parts of polyamide-imide resin, 15 parts of functional filler, and 5 parts of polyphenylene sulfide are added to 80 parts of N-methylpyrrolidone. The temperature is raised to 60 °C, and after stirring evenly, a polyamide-imide coating is prepared. It is evenly coated on the surface of the conductor and cured to obtain a polyamide-imide coating.

[0053] The functional filler is prepared through the following steps:

[0054] Step S11: Add nano-silica into an ethanol aqueous solution with a volume fraction of 10%, add γ-(methacryloyloxy)propyltrimethoxysilane, raise the temperature to 45 °C, stir evenly and react for 4 h. After the reaction ends, modified nano-silica is obtained. Control the dosage ratio of nano-silica, γ-(methacryloyloxy)propyltrimethoxysilane, and ethanol aqueous solution to be 2 g∶0.5 g∶50 mL;

[0055] Step S12: Add N-cyclohexylmaleimide and benzoyl peroxide into xylene, stir for 45 min, then add styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica in sequence. After stirring evenly, raise the temperature to 105 °C, stir evenly and react for 6 h. After the reaction ends, a functional filler is obtained. Control the dosage ratio of N-cyclohexylmaleimide, styrene, 4-allyloxy-2-hydroxybenzophenone, and modified nano-silica to be 2 mmol∶4 mmol∶2 mmol∶1.2 g, and the dosage of benzoyl peroxide is 0.5% of the weight of N-cyclohexylmaleimide.

[0056] The conductor is round aluminum wire.

[0057] The thickness of the polyester-imide coating is 3 mm.

[0058] The high-voltage-resistant composite polyamide-imide enameled round aluminum wire is prepared through the following steps: The surface of the round aluminum wire is evenly coated with a polyamide-imide coating to form a polyamide-imide coating, and then a polyester-imide coating is coated. After curing, a polyamide-imide enameled round aluminum wire is obtained. Finally, a surface lubricant is coated on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be closely arranged during wire winding and is convenient for users to wind coils.

[0059] Comparative Example 1

[0060] Use nano-silica to replace the functional filler, and the rest is the same as in Example 4.

[0061] Comparative Example 2

[0062] This comparative example is an enameled round aluminum wire produced by a certain company on the market.

[0063] The properties of the high-voltage-resistant composite polyamide-imide enameled round aluminum wires prepared in Examples 1-4 and Comparative Examples 1-2 are detected, and the results are shown in Table 1 below:

[0064] The number of painting passes is 9 + 3. The performance of the enameled wire is tested with reference to GB / T 6109.20-2008 "Enamelled round winding wires - Part 20: 200-class polyamide-imide composite polyester or polyester-imide enamelled round wires". The specific data are shown in Table 1;

[0065] Table 1

[0066]

[0067] It can be seen from Table 1 above that the enameled wires prepared in Examples 1-4 of the present invention have excellent heat and high voltage resistance. It shows that N-cyclohexyl maleimide, styrene, 4-allyloxy-2-hydroxybenzophenone and modified nano-silica are used as monomers respectively, and polymerize under the action of the initiator benzoyl peroxide on the surface of silica. Through the heat-resistant characteristics of N-cyclohexyl maleimide itself, it can endow the matrix with excellent heat resistance in cooperation with styrene. Moreover, 4-allyloxy-2-hydroxybenzophenone is introduced. 4-allyloxy-2-hydroxybenzophenone can be used as an excellent voltage stabilizer to prevent the matrix from forming a charge channel and breakdown due to a high dielectric constant under high temperature conditions, and improve the high voltage resistance of the enameled wire.

[0068] The above content is only an example and illustration of the concept of the present invention. Those skilled in the art of this technology make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. High-voltage composite polyamide-imide enameled round aluminum wire, characterized in that: including a conductor, a polyamide-imide coating and a polyester-imide lacquer coating; The polyamide-imide coating is prepared by the following steps: By weight, 50-60 parts of polyamide-imide resin, 10-15 parts of functional filler and 2-5 parts of polyphenylene sulfide are added to 50-80 parts of N-methylpyrrolidone, the temperature is raised to 45-60° C., and the polyamide-imide coating is prepared after being stirred evenly, and the coating is evenly applied on the surface of the conductor, and the coating is cured to prepare a polyamide-imide coating; The functional filler is prepared by the following steps: Step S11, adding nano-silica to a 10% volume fraction ethanol aqueous solution, adding γ-(methacryloyloxy)propyltrimethoxysilane, heating to 40-45° C., stirring at a constant speed and reacting for 4 hours, and after the reaction is completed, obtaining modified nano-silica; Step S12, adding N-cyclohexylmaleimide and benzoyl peroxide to xylene, stirring for 30-45 minutes, then adding styrene, 4-propyleneoxy-2-hydroxybenzophenone and modified nano-silica in sequence, stirring evenly, heating to 100-105° C., stirring at a constant speed and reacting for 4-6 hours, and obtaining a functional filler after the reaction is completed.

2. The high-voltage resistant composite polyamide-imide enameled round aluminum wire according to claim 1, characterized in that: In step S11, the dosage ratio of nano-silicon dioxide, γ-(methacryloyloxy)propyltrimethoxysilane and ethanol aqueous solution is controlled to be 1-2 g: 0.3-0.5 g: 50 mL.

3. The high-voltage resistant composite polyamide-imide enameled round aluminum wire according to claim 1, characterized in that: In step S12, the dosage ratio of N-cyclohexylmaleimide, styrene, 4-propyleneoxy-2-hydroxybenzophenone and modified nano-silica is controlled to be 1-2mmol: 2-4mmol: 1-2mmol: 1-1.2g, and the dosage of benzoyl peroxide is 0.3-0.5% of the weight of N-cyclohexylmaleimide.

4. The high-voltage resistant composite polyamide-imide enameled round aluminum wire according to claim 1, characterized in that: The conductor is a round aluminum wire.

5. The high voltage resistant composite polyamide-imide enameled round aluminum wire according to claim 1, characterized in that: The thickness of the polyesterimide coating is 1-3 mm.

6. The high-voltage resistant composite polyamide-imide enameled round aluminum wire according to claim 1, characterized in that: The high-voltage resistant composite polyamide-imide enameled round aluminum wire is manufactured by the following steps: a polyamide-imide coating is evenly coated on the surface of the round aluminum wire to form a polyamide-imide coating, a polyester-imide coating is then coated, and after curing, a polyamide-imide enameled round aluminum wire is obtained; finally, a layer of surface lubricant is coated on the surface of the polyamide-imide enameled round aluminum wire, so that the enameled wire can be arranged tightly when it is wound up and it is convenient for users to wind coils.

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