JPS5913806B2 - Manufacturing method of insulated wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Orthopedics The present invention relates to a method for manufacturing an insulated wire by electrodeposition of a water-dispersible paint.

Traditional technology] The electrodeposited layer deposited on the conductor by electrodeposition from water-dispersible paint contains a large amount of water, so if it is baked as is, pinholes, cracks, etc. may occur. Because of this, it is not possible to obtain an insulating inner film with good withstand voltage characteristics, and a method has been proposed in which the electrodeposited layer is wet-treated with high-temperature steam or water prior to baking.

This wet treatment has a dehydration effect that causes the electrodeposited layer to coagulate and the moisture contained in the layer to be precipitated to the outside, but perhaps because this dehydration effect is not sufficient, the voltage resistance of the insulating layer after baking is is not necessarily sufficient. [Objective and summary of the present invention] 5 The present invention proposes an improved method for manufacturing an insulated wire having an insulating layer with excellent withstand voltage characteristics. Electrodeposition 40-60
It is characterized in that it is carried out in a water-dispersible paint maintained at ℃.

``0 [Detailed explanation of the gist of the present invention] Fig. 1 is an explanatory diagram of the present invention, in which a conductor W running in the direction of the arrow is first filled with water-dispersible anodic deposition type electrodeposition paint 1; Then, it passes through an electrodeposition bath 2 in which a cathode tube 3 is installed, and is electrodeposited using a conventional method.

15 In that case, the conductor is an anode, but if a cathode-deposition type electrodeposition paint is used, the above-mentioned cathode-anode relationship can be reversed and used in the same manner as the anodic-deposition type electrodeposition paint.

Here, the water-dispersible paint 1 is maintained at a temperature of 40°C to 60°C. The reason for the above limitation is that if the paint temperature is low, the effects of the present invention cannot be obtained, and if the paint temperature is too high, water evaporates from the paint quickly, making it complicated to control the paint concentration. . The electrodeposited film on the conductor is then brought into direct contact with high-temperature water or steam in a wet treatment device 4 and heated under high humidity (5) to form a continuous film, which is then baked in a baking oven (not shown). .

The water or steam used in the wet treatment preferably has a high temperature of 80°C or higher, preferably 200°C or higher. [Effects of the present invention] n Since the conductor is preheated by electrodeposition in the electrodeposition paint maintained at a high temperature, the electrodeposition layer is effectively heated during the wet treatment of the electrodeposition layer, and the above-mentioned Electrodeposition in high-temperature paint forms a precipitated resin layer with a low moisture content, which is further dehydrated by wet treatment35, so the electrodeposited layer is baked with a low moisture content, resulting in pinholes. This makes it possible to produce an insulated wire with good withstand voltage characteristics.

C example 1] 1.0n copper wire at a wire speed of 15m/7! Acrylic water-dispersible paint (resin content 20%, pH 4.3) with a liquid temperature of 20°C obtained by emulsion polymerization of acrylonitrile, styrene, ethyl acrylate, and acrylic acid.
A DC voltage of 3 V was applied between the stainless steel pipe cathode and the above copper wire in an electrodeposition tank filled with a temperature of 300°C to form a film on the copper wire, and then passed through a 50m long tank filled with water vapor at 300°C. Insulated wire 1 was manufactured by baking.

[Examples 1 to 3] The liquid temperature of the acrylic water-dispersible paint during electrodeposition coating was
Insulated wires 2 to 4 were manufactured using a method different from Comparative Example 1 only in that the temperatures were 40°C, 50°C, and 60°C, respectively.

[Example 4] An insulated wire 5 was manufactured using a method different from Example 2 except that the wet treatment after electrodeposition was performed in 100° C. Q water for 1 minute.

Table 1 shows the characteristics of the insulated wire obtained above (measured in accordance with JISCj321O).

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the present invention, where W is a conductor, 2 is an electrodeposition tank, and 4 is a wet processing device.

Claims (1)

[Claims] 1 After electrocoating the conductor using a water-dispersible paint maintained at a temperature of 40 to 60°C, the coating layer on the conductor is wet-treated with water or steam at a high temperature of at least 80°C, and then baked. A method for manufacturing an insulated wire characterized by: