Corona-resistant polyimide enameled flat wire

Abstract

The utility model discloses a corona-resistant polyimide enameled flat wire, which comprises a copper flat wire body (10), and an aromatic polyimide paint layer (30), a corona-resistant paint layer (40), a polyamide-imide paint layer (50) and a polytetrafluoroethylene coating (60) are sequentially arranged outside the copper flat wire body (10). The corona-resistant paint layer (40) comprises a hyperbranched polyester modified polyesterimide unsaturated resin layer (401), a heat insulation coating (402), a nano aluminum oxide modified polyamideimide paint layer (403) and an organic silicon modified polyester paint layer (404). The corona-resistant cable has the characteristic that the corona-resistant performance can be effectively improved.

Description

Technical Field

[0001] The present invention relates to an enameled rectangular wire, in particular to a corona-resistant polyimide enameled rectangular wire. Background Art

[0002] An enameled rectangular wire, also known as a flat enameled wire, is a kind of enameled wire with a non-traditional conductor cross-section being rectangular or square, and is widely used in various motors with high performance requirements. However, the existing traditional class 240 flat enameled wire generally consists of a flat copper wire and multiple layers of aromatic polyimide paint layers coated on the surface of the flat copper wire. Although it can withstand a temperature of 240 °C, its corona resistance performance is average and cannot meet the increasingly high corona resistance performance requirements. Therefore, there is an urgent need to develop an enameled rectangular wire product with both good corona resistance and high temperature resistance to meet the usage needs of customers. Summary of the Invention

[0003] The purpose of the present invention is to provide a corona-resistant polyimide enameled rectangular wire. The present invention has the characteristic of being able to effectively improve the corona resistance performance.

[0004] The technical solution of the present invention: The corona-resistant polyimide enameled rectangular wire includes a copper rectangular wire body, and an aromatic polyimide paint layer, a corona-resistant paint layer, a polyamide-imide paint layer, and a polytetrafluoroethylene coating are sequentially arranged outside the copper rectangular wire body; the corona-resistant paint layer includes a hyperbranched polyester-modified polyesterimide unsaturated resin layer, a heat insulation coating, a nano-aluminum oxide-modified polyamide-imide paint layer, and an organosilicon-modified polyester paint layer.

[0005] In the aforementioned corona-resistant polyimide enameled rectangular wire, a fluorinated polyether ether ketone paint is further arranged outside the organosilicon-modified polyester paint layer.

[0006] In the aforementioned corona-resistant polyimide enameled rectangular wire, a group of annular partition grooves are arranged side by side along the length direction on the outer surface of the hyperbranched polyester-modified polyesterimide unsaturated resin layer, and a magnetic particle coating is arranged in the annular partition grooves. It can not only play a certain role in blocking the temperature transfer, but also improve the adhesion performance of the paint layer.

[0007] In the aforementioned corona-resistant polyimide enameled rectangular wire, high-temperature resistant glass fibers are further spirally wound outside the aromatic polyimide paint layer.

[0008] Compared with the prior art, through the mutual cooperation among the aromatic polyimide paint layer, corona-resistant paint layer, polyamide-imide paint layer and polytetrafluoroethylene coating arranged outside the copper flat wire body, the enameled wire can not only achieve the high-temperature resistance performance of Class 240, but also effectively improve the corona-resistant performance, and can also make the surface of the paint layer have good corrosion resistance and lubricating non-adhesion. At the same time, the corona-resistant paint layer of the present application is composed of a hyperbranched polyester-modified polyesterimide unsaturated resin layer, a heat-insulating coating, a nano-aluminum oxide-modified polyamide-imide paint layer, an organosilicon-modified polyester paint layer and a fluorinated polyether ether ketone paint, which can not only effectively improve the corona-resistant performance, but also have good heat-insulating performance, and can also make the paint layer have good flexibility.

[0009] In addition, by helically winding high-temperature-resistant glass fibers outside the aromatic polyimide paint layer, the adhesion performance of the paint film can be improved, and the tear-proof performance of the paint layer can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the present utility model;

[0011] Figure 2 is a cross-sectional view of the annular partition groove and the magnetic particle coating;

[0012] Figure 3 is an installation view of the high-temperature-resistant glass fiber.

[0013] The reference numerals in the drawings are: 10 - copper flat wire body, 20 - high-temperature-resistant glass fiber, 30 - aromatic polyimide paint layer, 40 - corona-resistant paint layer, 50 - polyamide-imide paint layer, 60 - polytetrafluoroethylene coating, 401 - hyperbranched polyester-modified polyesterimide unsaturated resin layer, 402 - heat-insulating coating, 403 - nano-aluminum oxide-modified polyamide-imide paint layer, 404 - organosilicon-modified polyester paint layer, 405 - fluorinated polyether ether ketone paint, 70 - annular partition groove, 80 - magnetic particle coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] The present invention will be further described below with reference to the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0015] Embodiment. The corona-resistant polyimide enameled flat wire has a structure as Figures 1-3 shown, including a copper flat wire body 10, and an aromatic polyimide paint layer 30, a corona-resistant paint layer 40, a polyamide-imide paint layer 50 and a polytetrafluoroethylene coating 60 are sequentially arranged outside the copper flat wire body 10; the corona-resistant paint layer 40 includes a hyperbranched polyester-modified polyesterimide unsaturated resin layer 401, a heat-insulating coating 402, a nano-aluminum oxide-modified polyamide-imide paint layer 403 and an organosilicon-modified polyester paint layer 404.

[0016] An organosilicon-modified polyester paint layer 404 is further provided with a fluorinated polyether ether ketone paint 405.

[0017] A group of annular grooves 70 are arranged side by side along the length direction on the outer surface of the hyperbranched polyester-modified polyester imide unsaturated resin layer 401, and a magnetic particle coating 80 is arranged in the annular grooves 70. It can not only play a certain role in blocking temperature transfer, but also improve the adhesion performance of the paint layer.

[0018] The aromatic polyimide paint layer 30 is further spirally wound with high-temperature resistant glass fibers 20. It can improve the adhesion performance of the paint film and the anti-tearing performance of the paint layer.

[0019] A corona-resistant polyimide enamelled rectangular wire comprises the following steps:

[0020] S1. Preparation of the rectangular wire: The round copper wire is drawn and rolled by a drawing device to obtain a copper rectangular wire.

[0021] S2. Adopt a short-circuit DC annealing process to continuously anneal and soften the main body of the flat wire to obtain an annealed flat copper wire, and then perform ultrasonic cleaning of the annealed flat copper wire with deionized water to obtain a copper rectangular wire body.

[0022] S3. Painting: The copper rectangular wire body is painted on a painting mechanism. First, an aromatic polyimide paint layer is coated, then high-temperature resistant glass fibers are wound, and then a corona-resistant paint layer, a polyamide-imide paint layer and a polytetrafluoroethylene coating are successively coated to obtain an enamelled rectangular wire.

[0023] The coating process of the corona-resistant paint layer is as follows: First, a hyperbranched polyester-modified polyester imide unsaturated resin layer is coated on the surface of the aromatic polyimide paint layer, a group of side-by-side annular grooves are pressed on the surface of the hyperbranched polyester-modified polyester imide unsaturated resin layer, and a magnetic particle coating is coated in the annular grooves, and then a heat-insulating coating, a nano-aluminum oxide-modified polyamide-imide paint layer, an organosilicon-modified polyester paint layer and a fluorinated polyether ether ketone paint are successively coated.

Claims

1. Corona-resistant polyimide enameled rectangular wire, characterized in that: It includes a copper flat wire body (10), and an aromatic polyimide paint layer (30), a corona-resistant paint layer (40), a polyamide-imide paint layer (50) and a polytetrafluoroethylene coating (60) are successively arranged outside the copper flat wire body (10); the corona-resistant paint layer (40) includes a hyperbranched polyester-modified polyesterimide unsaturated resin layer (401), a heat insulation coating (402), a nano-aluminum oxide-modified polyamide-imide paint layer (403) and a silicone-modified polyester paint layer (404).

2. The corona-resistant polyimide enamelled rectangular wire according to claim 1, wherein: A fluorinated polyetheretherketone paint (405) is further arranged outside the silicone-modified polyester paint layer (404).

3. The corona-resistant polyimide enameled rectangular wire according to claim 1, wherein: A group of annular partition grooves (70) are arranged side by side along the length direction on the outer surface of the hyperbranched polyester-modified polyesterimide unsaturated resin layer (401), and a magnetic particle coating (80) is arranged in the annular partition grooves (70).

4. The corona-resistant polyimide enamelled rectangular wire according to claim 1, characterized in that: High-temperature resistant glass fibers (20) are further spirally wound outside the aromatic polyimide paint layer (30).

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