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A kind of paint stripper and its paint stripping method

A paint remover and conformal paint technology, applied in the direction of chemical paint/ink remover, coating, etc., can solve the problems of inapplicability to PCB boards, inability to remove paint removal time, and inappropriate local paint removal, etc., to achieve improved Penetration, improvement of paint removal efficiency, effect of high paint removal efficiency

Active Publication Date: 2017-01-18
SIEMENS NUMERICAL CONTROL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • A kind of paint stripper and its paint stripping method
  • A kind of paint stripper and its paint stripping method

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Embodiment Construction

[0025] In order to facilitate a clearer understanding of the technical features, purposes and effects of the present invention, specific implementations of the present invention are now described.

[0026] This embodiment provides a paint remover for partially removing the conformal paint on the PCB. The material of the conformal paint is polyurethane-modified alkyd resin, and the thickness of the paint film is about 60 microns. The specific contents of the various components of the paint remover provided in this embodiment are shown in Table 1. When the paint remover is partially coated on the part of the three anti-paint that needs to be removed, the three anti-paint material will swell after a period of time, so that it can be easily peeled off from the surface of the PCB board. Table 1 shows 10 paint remover formulations with different component ratios and the paint stripping time corresponding to each formulation (even the time required for the three anti-paint to swell e...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D9/00
Inventor 王鹤云孟小翔安允贵
Owner SIEMENS NUMERICAL CONTROL
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