Paint remover and paint removing method thereof

Abstract

The invention provides a paint remover which comprises the following components in percentage by volume: 15-73% of dimethyl sulfoxide, 20-50% of N-methyl pyrrolidone, an organic cosolvent as well as a thickening agent and a thixotropic agent for reducing the flowability of the paint remover. The paint remover can be used for removing conformal paint which is prepared from alkyd resin materials on a PCB without influencing a substrate of the PCB, cannot remove green oil, does not need to be heated and is high in paint removing efficiency and friendly to the environment.

Description

technical field [0001] The invention relates to a paint remover, in particular to a paint remover for removing the conformal paint on a PCB. Background technique [0002] Printed circuit board (PCB board) is an important component widely used in various electronic and electrical equipment, and is used to carry various components to realize the function of the equipment, such as resistors, capacitors, integrated circuits, etc. In order to prevent various components on the PCB board from being affected by water vapor, dust, external force impact, etc., the PCB board is usually coated with three anti-paints, which can be insulated, moisture-proof, leakage-proof, shock-proof, dust-proof, corrosion-proof, anti-aging, So as to protect the PCB board from the erosion of the environment, improve and prolong the service life, and ensure the safety and reliability of use. [0003] When a component on the PCB needs to be repaired or replaced, it is first necessary to remove the conform...

AI Technical Summary

Problems solved by technology

However, most of the paint removers in the prior art are mainly aimed at metal substrates, and most of them are soluble to plastics, so they cannot be applied to PCB boards

However, plastic paint removers need to be heated above 60°C or even close to boiling, which consumes a lot of energy.

In addition, there is green oil on the PCB, and the paint remover can easily dissolve the green oil while removing the three anti-paint

And most of the plastic paint strippers are immersion liquids, which are not suitable for partial paint removal

Especially for the three anti-paints composed of alkyd resin materials (such as alkyd resin, polyurethane modified alkyd resin, copolymer or blend containing alkyd resin), using the existing technology No paint stripper can remove or take a long time to remove paint

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