A stripping process of solder resist/character ink

A process and character technology, applied in the field of stripping technology, can solve the problems of copper surface corrosion of printed circuit boards, high waste rate of character ink boards, and high production costs, and achieve the effects of improving yield, low preparation cost and low price.

Active Publication Date: 2019-04-26
东莞市斯坦得电子材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many printed circuit board factories usually use sodium hydroxide high temperature immersion, its defects are: high temperature (90 ℃ ~ 95 ℃), long time (about 4 hours)
Such a high alkalinity, temperature and long time will easily cause the copper surface of the printed circuit board to corrode, the gold surface will change color, especially the corrugation (non-circuit part)
In particular, in today's era of halogen-free, halogen-free substrates simply cannot withstand such harsh conditions
Due to the high waste rate of single sodium hydroxide stripping solder mask / character ink board, the general base material is 25-30%, and the halogen-free base material is as high as 50-60%, so that the production cost remains high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] First configure the stripping agent aqueous solution 10wt.% of solder resist / character ink, wherein the stripping agent is NaOH 160g / L, NaOH 2 S 2 o 3 10g / L and TX-10 1ml / L; the alkalinity of the stripper aqueous solution is 4.0N, the specific gravity is 1.05, and the water in the stripper aqueous solution is deionized water. Use a 316 stainless steel heater to heat the 316 stainless steel stripping cylinder to 80°C, put the reworked printed circuit board 316 stainless steel insert into the 316 stainless steel stripping cylinder and soak for 1 hour. Take out the 316 stainless steel socket of the soaked reworked printed circuit board, rinse it with tap water or nylon brush at room temperature; and dry it at 100°C for 1 hour to transfer to the pre-treatment process of solder mask / character ink screen printing. Please refer to Table 1 for the quality performance of the 316 stainless steel frame after the stripping process.

[0014] Table 1

[0015] Test items...

Embodiment 2

[0018] First configure the stripping agent aqueous solution 16wt.% of solder resist / character ink, wherein the stripping agent is NaOH 160g / L, NaOH 2 S 2 o 3 10g / L and TX-10 1ml / L; the alkalinity of the stripper aqueous solution is 4.0N, the specific gravity is 1.25, and the water in the stripper aqueous solution is deionized water. Use a 316 stainless steel heater to heat the 316 stainless steel stripping cylinder to 85°C, put the reworked printed circuit board 316 stainless steel insert into the 316 stainless steel stripping cylinder and soak for 1 hour; soak the reworked printed circuit board Take out the PP frame, wash it with tap water or nylon brush at room temperature; and dry it at 100°C for 1 hour to transfer to the pre-treatment process of solder mask / character ink screen printing. Please refer to Table 2 for the quality performance of the 316 stainless steel frame after the stripping process.

[0019] Table 2

[0020] Test items

[0021] It can be se...

Embodiment 3

[0023] First configure the stripping agent aqueous solution 10wt.% of solder resist / character ink, wherein the stripping agent is NaOH 160g / L, NaOH 2 S 2 o 3 10g / L and; TX-10 1ml / L; the alkalinity of the stripper aqueous solution is 4.0N, the specific gravity is 1.053, and the water in the stripper aqueous solution is deionized water. Use a 316 stainless steel heater to heat the 316 stainless steel stripping cylinder to 83°C, put the reworked printed circuit board 316 stainless steel insert into the 316 stainless steel stripping cylinder and soak for 1 hour; soak the reworked printed circuit board The 316 stainless steel frame is taken out, rinsed with tap water or nylon brush at room temperature; and dried at 100°C for 1 hour to transfer to the pre-treatment process of solder mask / character ink screen printing. Please refer to Table 3 for the quality performance of the 316 stainless steel frame after the stripping process.

[0024] table 3

[0025] Test items ...

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PUM

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Abstract

The invention provides a solder-resistor / character ink stripping technology. The technology comprises the following steps that a 10-16wt% of a stripping agent solution of a solder-resistor / character ink is configured, and a stripping agent comprises 40g / L of NaOH, 10g / L Na2S2O3 and TX-101ml / L; a heater heats a stripping cylinder to 80 to 85 DEG C; a returned printed circuit board rack is placed in the stripping cylinder and immersed for 1 hour; the immersed returned printed circuit board rack is taken out and washed by tap water or brushed by a nylon brush at the room temperature; and drying is carried out for 1 hour at the temperature of 100 DEG C, and a pretreatment process of solder-resist / character ink screen-printing is turned to. The technology is suitable for common FR-4 base materials and halogen-free base materials, ripple exposure is prevented, and copper and golden surfaces are not attacked. According to the technology, complex equipment is not needed, the technology is simple, material resources are wide, the cost is low, the preparation cost is low, the production process is free of pollution, and the technology is suitable for industrial production.

Description

technical field [0001] The invention relates to a stripping process of printed circuit board solder resist / character ink after solidification. After stripping, there is no solder resist / character ink residue on the printed circuit board, and it will not attack the copper and gold surface of the printed circuit board base material. Causes ripples to appear, especially suitable for halogen-free substrates, and the ink stripping time is short. Background technique [0002] Printed circuit board solder resist ink is to prevent short circuit between lines or pads during soldering, and a layer of solder resist ink is screen printed on the printed circuit board, and the character ink is printed on the printed circuit board. Including symbols of components) to facilitate the assembly of components. Since the ink is printed on the circuit board through screen printing, especially the solder resist ink must be pre-cured and then screen-printed on the other side, and then pre-cured. A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K3/28
Inventor 束学习
Owner 东莞市斯坦得电子材料有限公司
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