Wear-resistant high-adhesiveness flat enameled copper wire and production process thereof

Abstract

The invention discloses a wear-resistant high-adhesiveness flat enameled copper wire and a production process thereof, the wear-resistant high-adhesiveness flat enameled copper wire comprises a copper flat wire main body (1), polyimide insulating paint (2), an inner nylon layer (3), a polybismaleimide-arylamine resin layer (4), a polyamide-imide insulating paint layer (5) and an outer nylon layer (6) are sequentially arranged outside the copper flat wire main body (1), and a wear-resistant coating (7) is arranged on the surface of the outer nylon layer (6); the inner nylon layer (3) comprises a first nylon layer (301) and a second nylon layer (302), and a glass fiber layer (303) distributed in a grid shape is arranged on the surface of the first nylon layer (301). The method has the characteristic that the wear resistance can be effectively improved.

Description

Technical Field

[0001] The invention relates to an enameled flat wire, in particular to a wear-resistant and high-adhesion flat enameled copper wire and a production process thereof. Background Art

[0002] Enameled flat wire refers to enameled wire with a rectangular or square conductor cross section, which is widely used in various motors with high performance requirements. Existing enameled flat wires mostly use a multi-layer polyimide paint structure, which has a high temperature resistance and excellent chemical resistance, but average wear resistance. In addition, since the two narrow ends of the enameled flat wire are rounded chamfered, the rounded chamfers are more prone to wear than the upper and lower surfaces, and the paint film is more likely to break and fall off. Therefore, the existing technology has the problem of poor wear resistance. Summary of the invention

[0003] The object of the present invention is to provide a wear-resistant and high-adhesion flat enameled copper wire and a production process thereof. The present invention has the characteristic of being able to effectively improve the wear resistance.

[0004] The technical solution of the present invention is as follows: a wear-resistant and high-adhesion flat enameled copper wire comprises a copper flat wire body, and a polyimide insulating varnish, an inner nylon layer, a polybismaleimide-aromatic amine resin layer, a polyamide-imide insulating varnish layer and an outer nylon layer are sequentially arranged on the outside of the copper flat wire body, and a wear-resistant coating is arranged on the surface of the outer nylon layer; the inner nylon layer comprises a first nylon layer and a second nylon layer, and a grid-shaped distributed glass fiber layer is arranged on the surface of the first nylon layer.

[0005] In the aforementioned wear-resistant and high-adhesion flat enameled copper wire, the two flat narrow ends of the outer nylon layer are provided with step grooves, the surface of the step grooves is provided with concave holes, and the surface of the step grooves is also provided with an outer glass fiber layer; the wear-resistant coating includes a bottom wear-resistant coating located in the step groove, and the bottom wear-resistant coating is provided with an outer wear-resistant coating covering the outer nylon layer and the bottom wear-resistant coating.

[0006] In the aforementioned wear-resistant and high-adhesion flat enameled copper wire, a metal oxide polyamide-imide varnish layer is further provided between the polyimide insulating varnish and the inner nylon layer.

[0007] The production process of wear-resistant and high-adhesion flat enameled copper wire includes the following steps:

[0008] S1, extruding the copper round wire to obtain an extruded copper flat wire;

[0009] S2, heat treating the extruded copper flat wire;

[0010] S3. Paint the surface of the copper flat wire;

[0011] S4, drying the copper flat wire coated with insulating paint;

[0012] S5. Finally, the enameled flat wire is cooled and wound up.

[0013] In the aforementioned production process of wear-resistant and high-adhesion flat enameled copper wire, the specific process of step S3 painting operation is: first, polyimide insulating varnish, metal oxide polyamide-imide varnish layer and first nylon layer are sequentially coated on the surface of the copper flat wire body, and then a grid-shaped glass fiber layer is adhered, and then a second nylon layer, polybismaleimide-aromatic amine resin layer, polyamide-imide insulating varnish layer and outer nylon layer are sequentially coated; then, step grooves are set at the two narrow side ends of the outer nylon layer, and concave holes are set on the surface of the step grooves, and then the outer glass fiber layer is adhered; finally, a bottom wear-resistant coating and an outer wear-resistant coating are applied.

[0014] Compared with the prior art, the present invention sequentially arranges a polyimide insulating varnish layer, an inner nylon layer, a polybismaleimide-aromatic amine resin layer, a polyamide-imide insulating varnish layer, an outer nylon layer and a wear-resistant coating outside the main body of the copper flat wire, thereby effectively improving the overall wear resistance and adhesion performance of the enameled copper flat wire while ensuring the performance of the enameled wire varnish (such as corona resistance, heat resistance, etc.), and reducing the phenomenon of the paint film falling off and being damaged. At the same time, the inner nylon layer of the present application is composed of a first nylon layer, a grid-shaped glass fiber layer and a second nylon layer, which can further improve the tear resistance of the paint layer and reduce the phenomenon of the paint film falling off. In summary, the present invention has the characteristics of being able to effectively improve the wear resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the structure of a double-circulation drying device for producing enameled flat wire;

[0017] Figure 3 yes Figure 2 A partial enlarged view of

[0018] Figure 4 It is a side view of a double-circulation drying device for the production of enameled flat wire.

[0019] The markings in the attached drawings are: 1-copper flat wire body, 2-polyimide insulating varnish, 3-inner nylon layer, 4-polybismaleimide-aromatic amine resin layer, 5-polyamide-imide insulating varnish layer, 6-outer nylon layer, 7-wear-resistant coating, 8-metal oxide polyamide-imide varnish layer, 301-first nylon layer, 302-second nylon layer, 303-glass fiber layer, 9-concave hole, 10-outer glass fiber layer, 11-step groove, 701-bottom wear-resistant coating, 702-outer wear-resistant coating; 21-furnace body, 22-furnace chamber, 2 3-threading port, 24-vertical partition, 25-threading hole, 26-electric heating module, 27-air outlet, 28-catalytic combustion chamber, 29-filtration purification chamber, 210-circulating air duct, 211-air inlet, 212-air balancing plate, 213-filtration purification module, 214-exhaust port, 215-exhaust fan, 131-pull-out rack, 132-chassis, 133-iron sealing plate, 134-handle, 135-slider, 136-filter, 291-annular groove, 292-magnet, 293-pull-out slide. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0021] Embodiment. Wear-resistant high-adhesion flat enameled copper wire, composed of Figure 1 As shown, it includes a copper flat wire body 1, and a polyimide insulating varnish 2, an inner nylon layer 3, a polybismaleimide-aromatic amine resin layer 4, a polyamide-imide insulating varnish layer 5 and an outer nylon layer 6 are sequentially arranged on the outside of the copper flat wire body 1, and a wear-resistant coating 7 is arranged on the surface of the outer nylon layer 6; the inner nylon layer 3 includes a first nylon layer 301 and a second nylon layer 302, and a grid-shaped glass fiber layer 303 is arranged on the surface of the first nylon layer 301.

[0022] The two flat narrow side ends of the outer nylon layer 6 are provided with stepped grooves 11, the surface of the stepped grooves 11 is provided with concave holes 9, and the surface of the stepped grooves 11 is also provided with an outer glass fiber layer 10; the wear-resistant coating 7 includes a bottom wear-resistant coating 701 located in the stepped grooves 11, and the bottom wear-resistant coating 701 is provided with an external wear-resistant coating 702 covering the outer nylon layer 6 and the bottom wear-resistant coating 701.

[0023] A metal oxide polyamide-imide varnish layer 8 is further provided between the polyimide insulating varnish 2 and the inner nylon layer 3 .

[0024] The production process of wear-resistant and high-adhesion flat enameled copper wire includes the following steps:

[0025] S1, extruding the copper round wire to obtain an extruded copper flat wire;

[0026] S2, heat treating the extruded copper flat wire;

[0027] S3. Paint the surface of the copper flat wire;

[0028] S4, drying the copper flat wire coated with insulating paint;

[0029] S5. Finally, the enameled flat wire is cooled and wound up.

[0030] The specific process of the painting operation in step S3 is: first, polyimide insulating varnish, metal oxide polyamide-imide varnish layer and the first nylon layer are sequentially coated on the surface of the copper flat wire body, and then a grid-shaped glass fiber layer is adhered, and then the second nylon layer, polybismaleimide-aromatic amine resin layer, polyamide-imide insulating varnish layer and outer nylon layer are sequentially coated; then, step grooves are set at the two narrow sides of the outer nylon layer, and concave holes are set on the surface of the step grooves, and then the outer glass fiber layer is adhered; finally, the bottom wear-resistant coating and the outer wear-resistant coating are coated.

[0031] The present application sets a stepped groove on the flat narrow side end of the outer nylon layer, and sets a bottom wear-resistant coating in the stepped groove, so as to thicken the wear-resistant layer on the narrow side ends on both sides, further improve the wear resistance of the narrow side ends on both sides, and thus effectively improve the wear resistance of the overall enameled wire. At the same time, the present application sets concave holes and an outer glass fiber layer on the surface of the stepped groove, which can improve the adhesion performance and further improve the overall tear resistance of the wear-resistant coating.

[0032] The bottom wear-resistant coating is flush with the upper surface of the outer nylon layer.

[0033] The bottom wear-resistant coating and the outer wear-resistant coating are integrally formed.

[0034] Preferably, the step groove includes a first step groove located on the flat side of the outer nylon layer, and a second step groove is provided between the inner side of the first step groove and the outer nylon layer. This can effectively improve the adhesion performance of the wear-resistant coating.

[0035] The metal oxide polyamide-imide paint layer refers to a polyamide-imide paint layer containing metal oxide (the metal oxide can be nano antimony metal oxide). It can improve the adhesion performance and have a certain electromagnetic shielding effect.

[0036] The preparation process of the present application is as follows: polyimide insulating varnish, metal oxide polyamide-imide varnish layer, and first nylon layer are sequentially coated on the surface of the main body of the copper flat wire, and then a grid-shaped glass fiber layer is adhered, and then a second nylon layer, a polybismaleimide-aromatic amine resin layer, a polyamide-imide insulating varnish layer, and an outer nylon layer are sequentially coated, two layers of stepped grooves are formed on the two narrow ends of the outer nylon layer, and concave holes are set on the surface of the stepped grooves, and then an outer glass fiber layer is adhered, and finally a bottom wear-resistant coating and an outer wear-resistant coating (forming a wear-resistant coating) are coated. The flat enameled wire prepared by the above method effectively improves the overall wear resistance and adhesion performance of the enameled copper flat wire while ensuring the performance of the enameled wire paint (such as corona resistance, heat resistance, etc.), and can also reduce the phenomenon of paint film shedding and damage.

[0037] In step S4, a double-circulation drying device for producing enameled flat wire is used for drying. The specific structure is as follows: Figure 2-4 As shown, it includes a furnace body 21, a furnace chamber 22 is provided in the furnace body 21, and threading holes 23 are provided on the left and right sides of the furnace chamber 22. A vertical partition 24 arranged front and back is provided in the middle of the furnace chamber 22, and threading holes 25 corresponding to the positions of the threading holes 23 are provided on the vertical partition 24. Electric heating modules 26 located at the bottom of the furnace chamber 22 and below the threading holes 23 are provided on both sides of the vertical partition 24. Two air outlets 27 located on the left and right sides of the vertical partition 24 are provided on the top of the furnace chamber 22, and a catalytic combustion chamber 28 and a filtering and purification chamber 29 are provided above each air outlet 27 in sequence, one side of the catalytic combustion chamber 28 is connected to the air outlet 27, and the other side of the catalytic combustion chamber 28 is connected to the filtering and purification chamber 29; a circulating air duct 210 is provided at the front and rear ends of the filtering and purification chamber 29, and the bottom of the circulating air duct 210 is connected to an air inlet 211 located on the side of the bottom of the furnace chamber 22, and an air balancing plate 212 is provided on the inner side of the air inlet 211.

[0038] The filtering and purifying chamber 29 is provided with a filtering and purifying module 213 , and the front and rear side walls of the filtering and purifying chamber 29 are provided with an exhaust port 214 connected to the circulating air duct 210 , and an exhaust fan 215 is provided at the exhaust port 214 .

[0039] The air outlet 214 is located above the filtering and purifying module 213 .

[0040] The filtering and purification module 213 includes a pull-out frame 131, a chassis 132 is provided at the bottom of the pull-out frame 131, a filter 136 is provided on the upper part of the pull-out frame 131, an iron sealing plate 133 is provided at the outer end of the pull-out frame 131, and a handle 134 is provided outside the iron sealing plate 133; the pulling side of the filtering and purification chamber 29 is provided with an annular groove 291 that matches the iron sealing plate 133, and an attractive magnet 292 is embedded in the annular groove 291.

[0041] The inner bottom surface of the filtering and purifying chamber 29 is provided with a pull-out slide groove 293 , and the bottom surface of the chassis 132 is provided with a sliding block 135 .

[0042] A heat-conducting receiving tray is arranged above the electric heating module so as to receive the wire enameling paint dripping from the enameled flat wire.

[0043] The inner wall surface of the iron sealing plate is provided with an annularly distributed sealing groove, and the annular groove is provided with a sealing protrusion matched with the sealing groove, thereby further improving the sealing performance of the filtering and purifying module.

[0044] The outer surface of the circulating air duct is provided with a heat preservation layer, so as to play a role of heat preservation, reduce heat loss and improve the utilization rate of heat source.

[0045] A catalytic burner is arranged in the catalytic combustion chamber.

[0046] The circulating air duct is also connected to a new air duct.

[0047] The air inlets on the left and right sides of the air purification chamber are tilted upward.

[0048] The filtration and purification module adopts a pull-out structure, which greatly facilitates the replacement of the filter. A chassis is provided under the pull-out frame to absorb dust, etc.

[0049] Replacement and installation process of the filter purification module: insert the slider under the bottom chassis of the pull-out frame into the pull-out slot on the bottom surface of the filter purification chamber, and then push the pull-out frame inward until the iron sealing plate is attracted to the magnet on the annular groove to complete the installation of the filter purification module. To remove it, just pull it outward.

[0050] The left side of the vertical partition of the furnace is the first drying chamber, and the right side is the second drying chamber.

[0051] The air inlet is also provided with a blower.

[0052] The drying process of the present application: the enameled flat wire passes through the threading port (long linear opening) on ​​the left side of the furnace, the threading hole on the vertical partition and the threading port (long linear opening) on ​​the right side of the furnace from left to right. In this process, the enameled flat wire passes through the first drying chamber on the left and the second drying chamber on the right in turn. The electric heating modules in the two drying chambers are controlled according to the actual temperature requirements so that the first drying chamber and the second drying chamber maintain the corresponding temperature. The exhaust gas in the furnace is discharged from the air outlet, first passes through the catalytic burner in the catalytic combustion chamber for catalytic combustion, removes flammable and harmful substances in the exhaust gas, and then enters the filtration and purification chamber through the side pipe. After the exhaust gas passes through the filter under the suction of the exhaust fan, it enters the circulating air duct from the exhaust port, and finally enters the furnace under the action of the blower. Under the action of the air distribution plate, the heat generated by the electric heating module is evenly applied to each enameled flat wire, and the hot air passes through the enameled flat wire from bottom to top, and finally discharged from the air outlet.

[0053] This application divides the furnace into two heating and drying chambers by setting a vertical partition arranged in the front and back direction in the furnace, and an electric heating module is set in each drying chamber, so that drying operations in different temperature ranges can be completed on the same drying equipment, and the temperature adjustment is flexible and the operation is convenient. At the same time, each heating chamber is equipped with an independent exhaust gas recycling system, which can not only process the exhaust gas and reduce air pollution, but also effectively improve the heat utilization rate in the exhaust gas, saving energy and protecting the environment.

Claims

1. Wear-resistant and high-adhesion flat enameled copper wire, characterized by: The invention comprises a copper flat wire body (1), wherein a polyimide insulating varnish (2), an inner nylon layer (3), a polybismaleimide-aromatic amine resin layer (4), a polyamide-imide insulating varnish layer (5) and an outer nylon layer (6) are sequentially arranged on the outside of the copper flat wire body (1), and a wear-resistant coating (7) is arranged on the surface of the outer nylon layer (6); the inner nylon layer (3) comprises a first nylon layer (301) and a second nylon layer (302), and a glass fiber layer (303) distributed in a grid shape is arranged on the surface of the first nylon layer (301).

2. The wear-resistant and high-adhesion flat enameled copper wire according to claim 1, characterized in that: The two flat narrow side ends of the outer nylon layer (6) are provided with stepped grooves (11), the surface of the stepped grooves (11) is provided with concave holes (9), and the surface of the stepped grooves (11) is also provided with an outer glass fiber layer (10); the wear-resistant coating (7) comprises a bottom wear-resistant coating (701) located in the stepped grooves (11), and an outer wear-resistant coating (702) covering the outer nylon layer (6) and the bottom wear-resistant coating (701) is provided outside the bottom wear-resistant coating (701).

3. The wear-resistant and high-adhesion flat enameled copper wire according to claim 1, characterized in that: A metal oxide polyamide-imide varnish layer (8) is also provided between the polyimide insulating varnish (2) and the inner nylon layer (3).

4. A production process for the wear-resistant and highly adhesive flat enameled copper wire according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, extruding the copper round wire to obtain an extruded copper flat wire; S2, heat treating the extruded copper flat wire; S3. Paint the surface of the copper flat wire; S4, drying the copper flat wire coated with insulating paint; S5. Finally, the enameled flat wire is cooled and wound up.

5. The production process of the wear-resistant and high-adhesion flat enameled copper wire according to claim 4, characterized in that: The specific process of the painting operation in step S3 is: first, polyimide insulating varnish, metal oxide polyamide-imide varnish layer and the first nylon layer are sequentially coated on the surface of the copper flat wire body, and then a grid-shaped glass fiber layer is adhered, and then the second nylon layer, polybismaleimide-aromatic amine resin layer, polyamide-imide insulating varnish layer and outer nylon layer are sequentially coated; then, step grooves are set at the two narrow sides of the outer nylon layer, and concave holes are set on the surface of the step grooves, and then the outer glass fiber layer is adhered; finally, the bottom wear-resistant coating and the outer wear-resistant coating are coated.

Images