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Halogen-free PCB board special-purpose solder mask stripping agent, and preparation method and applications thereof

A technology of PCB board and stripping agent, which is applied in the field of special solder resist green paint stripping agent for halogen-free PCB board and its preparation field, can solve the problem of poor removal effect of polymer residues, difficult treatment of polymer pollutants, and no pollution. Halogen PCB board has problems such as poor alkali resistance, and achieves the effect of not easy to reveal the texture, good peeling effect, and not easy to damage the copper surface.

Active Publication Date: 2019-06-14
上海富柏化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its essence is a mixed inorganic alkali aqueous solution, although the swelling and removal efficiency of the solder resist green paint has been improved to a certain extent, but the following problems still exist: 1. Removal of polymer residues generated during the solder resist green paint stripping process The effect is not good, which makes it difficult to deal with the polymer pollutants adhered in the processing tank after stripping the green paint; 2. The copper surface of the PCB board is prone to blackening after soaking in high-concentration lye; 3. Halogen-free PCB board Poor alkali resistance, use the above-mentioned scavenger to strip off the solder resist green paint on the halogen-free PCB board, once the process is not properly controlled, it is easy to cause white spots and textures to appear

Method used

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  • Halogen-free PCB board special-purpose solder mask stripping agent, and preparation method and applications thereof
  • Halogen-free PCB board special-purpose solder mask stripping agent, and preparation method and applications thereof
  • Halogen-free PCB board special-purpose solder mask stripping agent, and preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-6

[0039] Embodiments 1-6 all relate to a special solder resist green paint stripper for halogen-free PCB boards, and its raw material composition is shown in Table 1 in terms of mass percentage:

[0040] Table 1.

[0041]

[0042] During preparation, weigh each component according to the ratio in Table 1, mix, and stir evenly to obtain the special solder resist green paint stripper for halogen-free PCB boards.

[0043] When stripping the solder resist green paint for halogen-free PCB boards, weigh an appropriate amount of prepared stripping agent and add it to the liquid tank, and heat it up to 75-85°C. Then, dip the PCB board into the stripper, so that the green paint on the PCB can be stripped evenly by the stripper. Depending on the type of PCB board, the thickness of the surface green paint, etc., the soaking time is different. Generally, the pre-examination board can be soaked for 15-30 minutes to peel off the solder-proof green paint, and soaked for 30-50 minutes will ...

Embodiment 6-10

[0045] Embodiments 6-10 all relate to a special solder resist green paint stripper for halogen-free PCB boards, all based on Embodiment 2, and the only difference from Embodiment 2 is that the types of organic bases selected are different, by mass percentage Content meter embodiment 6-10 raw material composition is as shown in table 2:

[0046] Table 2.

[0047]

Embodiment 11-15

[0049] Embodiments 11-15 all relate to a special solder resist green paint stripper for halogen-free PCB boards, all based on Embodiment 2, and the only difference from Embodiment 2 is: the selected organic solvent and the amount of the organic solvent are different, The raw material composition of embodiment 11-15 is as shown in table 3 by mass percentage content:

[0050] table 3.

[0051]

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PUM

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Abstract

The invention discloses a halogen-free PCB board special-purpose solder mask stripping agent, and a preparation method and applications thereof. The halogen-free PCB board special-purpose solder maskstripping agent comprises, by mass, 20 to 30% of an organic base, 3 to 8 % of an organic solvent, 0.1 to 1.0 % of a surfactant, 0.1 to 1.0 % of an organic solderability preservative, and the balance water. The halogen-free PCB board special-purpose solder mask stripping agent possesses excellent stripping effect, is suitable for stripping of a plurality of kinds of PCB board solder masks, and is especially excellent in stripping effect on halogen-free PCB board solder mask; when the halogen-free PCB board special-purpose solder mask stripping agent is adopted for solder mask peeling, texture exposure and white spot are not easily caused, after processing, PCB board cooper surface damage is avoided, no blacking is caused, halogen-free PCB board solder mask stripping reworking qualified yield is increased greatly, no obvious solid residue is detected in waste liquid obtained through processing, no obvious residue attached onto liquid tank internal walls is detected, production equipmentcleaning maintenance cost is reduced greatly. The invention also discloses the preparation method and applications of the halogen-free PCB board special-purpose solder mask stripping agent.

Description

technical field [0001] The invention belongs to the technical field of solder resist green paint strippers for printed circuit boards, and more specifically relates to a special solder resist green paint stripper for halogen-free PCB boards and its preparation method and application. Background technique [0002] Halogen refers to the seventh group (VIIA) non-metallic elements in the periodic table: fluorine (Fluorine), chlorine (Chlorine), bromine (Bromine), iodine (Iodine) and astatine (Astatine) five elements, collectively referred to as halogen. These halogen elements are often used in plastic additives, flame retardants, and organic solvents for industrial products such as cable sheaths, PCBs, electrical casings, and coatings. For example, adding a small amount of halogen-containing flame retardants to PCB substrates or solder resist green paints , It can greatly improve the flame retardancy level of PCB. This kind of PCB containing halogen is called halogen PCB. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D9/04C09D9/00
Inventor 饶猛夏金良莫庆生
Owner 上海富柏化工有限公司
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