Enameled wire polyimide insulating layer nondestructive depainting powder and depainting method

Abstract

The invention relates to an enameled wire polyimide insulating layer nondestructive depainting powder and depainting method. The depainting powder is prepared by adopting the following raw materials by weight percent: 84 to 86 percent of sodium hydroxide, 5.5 to 6.5 percent of sodium metasilicate nonahydrate, 3.5 to 4.5 percent of thiourea and 4.5 to 5.5 percent of sodium hexametaphosphate. The depainting method comprises the following steps: heating the depainting powder in a special depainting furnace to form liquid, soaking an enameled wire head needing depainting into the molten liquid to be subjected to depainting, then taking out the enameled wire head, washing, rinsing and dehydrating the enameled wire head, so that a purpose for completing the quick nondestructive depainting of a lead-out end of the enameled wire can be achieved. The depainting powder formula is environmental friendly and safe, not only can the enameled wire copper material be prevented from being corroded, oxidized and decolored, but also is easy to wash and remove, and the soldability of the enameled wire copper material is not affected. By adopting the method, the traditional method for depainting the lead-out end of the enameled wire by virtue of a piece of abrasive paper can be changed, and the breaking potential safety hazard of a coil can be greatly eliminated.

Description

technical field [0001] The invention belongs to the technical field of non-destructive paint removal for enameled wires, and in particular relates to a non-destructive paint removal powder and a paint removal method for polyimide insulating layers of enameled wires. Background technique [0002] The insulation layer of the enameled wire used to seal the coil of the electromagnetic relay is polyimide, and the temperature resistance is above 180°C, which is called high temperature resistant enameled wire. The insulation layer must be removed for soldering at the lead-out of the enameled wire during the coil winding process. However, this kind of high-temperature resistant insulating layer has high strength, good toughness, and strong adhesion, and is extremely difficult to remove. At present, sandpaper is generally used to polish and remove the paint. This method will inevitably cause damage to the surface of the enameled wire copper, and even make the thickness of the wire en...

AI Technical Summary

Problems solved by technology

However, this kind of high-temperature resistant insulating layer has high strength, good toughness, and strong adhesion, and is extremely difficult to remove. At present, sandpaper is generally used to polish and remove the paint. This method will inevitably cause damage to the surface of the enameled wire copper, and even make the thickness of the wire ends uneven. In this way, the hidden danger of wire breakage at the lead end of the coil is left, especially the enameled wire with a wire diameter of less than 1mm used by some micro relays, which is more likely to cause wire breakage or leave a hidden danger of wire breakage during the process of using sandpaper to remove the paint

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