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Polyester enamelled wire enamel removing process and device

A polyester paint and paint stripping technology, which is applied in the field of enameled wire paint stripping, can solve the problems of difficult waste water treatment, inability to recycle, poor operating conditions, etc., achieves simple preparation and use operation methods, is conducive to industrial production, and is suitable for use. wide effect

Active Publication Date: 2016-06-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The paint strippers in these patented technologies contain organic solvents such as low-boiling halogenated hydrocarbons, the operating conditions are poor, and the environment is polluted, and the waste water produced is difficult to treat.
[0004] In recent years, some enameled wire stripping processes have been disclosed. For example, the invention patent CN103106986A discloses a process for recovering copper from waste motor windings. The stripping agent is a mixture of sodium hydroxide solution and banana water, and the stripping process is repeated. Stir and rub until the paint remover is clay-like, but the paint remover in this process is sticky after use and cannot be recycled. Banana water also has problems such as low boiling point and poor safety; invention patent CN102558940A discloses a method for removing paint from enameled wires and Paint remover, the paint remover process is to pour sodium hydroxide and potassium hydroxide into a nickel crucible to heat up, melt and mix, then immerse the end of the enameled wire to be removed in the paint remover to remove the paint, after the paint is removed, the enameled wire Water washing, pickling and water washing are carried out separately, but this process is only suitable for a small amount of enameled wire stripping, mainly used for stripping enameled wire joints, not suitable for large-scale stripping
Invention patent CN1175111A discloses a method for recovering copper from windings. The depainting process is to immerse the windings composed of enameled wires in a strong alkali solution and then wash them with water. Ester degradation products, wastewater treatment is difficult, and cannot be recycled

Method used

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  • Polyester enamelled wire enamel removing process and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Prepare 30% aqueous sodium hydroxide solution in the lye tank as a paint remover and heat it to 90°C. Quickly pump paint stripper from lye tank into 1m with anchor paddle 3 In the paint stripping bucket, the pump speed of the paint stripper is 3m 3 / h. When overflow begins to appear, start stirring at a speed of 150 revolutions per minute. Put 0.5 tons of polyester enameled wire into the paint stripping bucket, immerse them all in the paint stripper, when the temperature in the paint stripping bucket reaches 90°C, start timing. After 1 hour, the paint film on the enameled wire all falls off, and overflows into the filter barrel for removing paint film with the lye, and the peeled paint film becomes flakes, and is filtered and recovered through the filter bag. The surface of the obtained copper wire is bright, the paint stripper can be recycled, and the paint stripping effect remains unchanged.

Embodiment 2

[0037] Prepare 10% potassium hydroxide aqueous solution in the lye tank as a paint remover, and heat it to 105°C. Quickly pump the paint stripper in the lye tank into the 1m with 45° inclined paddle 3 In the paint stripping bucket, the pump speed of the paint stripper is 6m 3 / h. When overflow begins to appear, start stirring at a speed of 300 revolutions per minute. Put 0.5 tons of polyester enameled wire into the paint stripping bucket, immerse them all in the paint stripper, when the temperature in the paint stripping bucket reaches 105°C, start timing. After 2.5 hours, the paint film on the enameled wire falls off completely, and overflows with the lye into the filter barrel for removing the paint film. The peeled paint film becomes flakes and is filtered and recovered through the filter bag. The surface of the obtained copper wire is bright, but there are a small amount of black spots on the surface of the copper wire, the paint remover can be recycled, and the paint r...

Embodiment 3

[0039] Prepare 40% aqueous sodium hydroxide solution in the lye tank as a paint remover and heat it to 90°C. Quickly pump paint stripper from lye tank into 1m with anchor paddle 3 In the paint stripping bucket, the pump speed of the paint stripper is 5m 3 / h. When overflow begins to appear, start stirring at a speed of 30 revolutions per minute. Put 0.5 tons of polyester enameled wire into the paint stripping bucket, immerse them all in the paint stripper, when the temperature in the paint stripping bucket reaches 90°C, start timing. After 0.45 hours, the paint film on the enameled wire falls off completely, and overflows with the lye into the filter barrel for removing the paint film, and the peeled paint film becomes flakes, and is filtered and recovered through the filter bag. The surface of the obtained copper wire is bright, the paint stripper can be recycled, and the paint stripping effect remains unchanged.

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Abstract

The invention relates to a polyester enamelled wire enamel removing process. The process includes following steps: 1), adding an enamel removing agent into an alkaline liquid tank, heating enamel film treatment temperature of a polyester enamelled wire, wherein the enamel removing agent is a sodium hydroxide and / or potassium hydroxide inorganic alkaline solution of 10-40% in mass concentration; 2), pumping the enamel removing agent in the alkaline liquid tank into the bottom of an enamel removing bucket with a stirring paddle, and placing the polyester enamelled wire to be subjected to enamel removing into the enamel removing bucket; 3), starting stirring after overflowing, and enabling rotating speed to be 30-300 rpm, wherein a shedding enamel film overflows along with the enamel removing agent from an overflowing tank at the top of the enamel removing bucket and flows into a filtering bucket; 4), separating the shedding enamel film from the enamel removing agent in the filtering bucket, wherein the enamel removing agent continues entering the alkaline liquid tank. The invention further relates to a polyester enamelled wire enamel removing device. The polyester enamelled wire enamel removing process and device is convenient to operate, wide in application range, good in enamel removing effect, free of volatilization, little in metal base material corrosion and capable of realizing mass enamel removing.

Description

technical field [0001] The invention relates to the technical field of enameled wire stripping, in particular to a polyester enameled wire stripping process and device. Background technique [0002] Polyester enameled wire is a commonly used industrial consumable. The base copper wire in polyester enameled copper wire is an oxygen-free or low-oxygen copper rod with a copper content of more than 95%. It is a high-quality waste copper resource and is suitable for direct recycling. Before the waste copper is reused, the polyester paint on the surface of the polyester enameled wire needs to be removed. At present, the industry mainly adopts combustion method or mechanical method to remove paint from polyester enameled wire. The use of combustion to remove paint not only pollutes the environment and emits environmentally harmful waste gas, but also has a serious impact on the quality of copper materials that need to be recycled. In addition, it is not conducive to the recycling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D9/00
CPCC09D9/00
Inventor 单国荣何静
Owner ZHEJIANG UNIV
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