PCB (Polychlorinated Biphenyl) acidic etching solution

An acid etching solution and etching technology, applied in the field of PCB acid etching solution, can solve the problems of low etched circuit pattern accuracy, high HCl dosage, insufficient uniformity, etc., and achieve the benefits of production efficiency, simple preparation method, and reduced usage. Effect

Active Publication Date: 2014-10-01
长沙牧泰莱电路技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the object of the present invention is to propose a kind of PCB acid etchant, solve the technical problem that the precision of the etching circuit pattern existing in the prior art is not high, the uniformity is not high enough and the HCl consumption is higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] PCB acidic etching solution components and the content of each component are: etching mother liquid copper (copper chloride) 140g / L, hydrochloric acid (HCl content is 31%) 160g / L, NaClO 3 200g / L, sodium chloride 150g / L, urea 0.5g / L, potassium chloride 5g / L, sodium hydroxide 0.1g / L, and the rest is water.

[0018] This NaClO 3 The following reactions occurred during the acidic etching solution of the / HCl system:

[0019] 1. Copper corrosion reaction: Copper can exist in three oxidation states, metal copper CuO on the board surface, blue ion Cu in the etching bath 2+ , and the less common cuprous ion Cu + . Metallic copper CuO can be removed by Cu in the etching bath 2+ Oxidation and dissolution, see the following reaction formula (1)

[0020] 3Cu+3CuCl 2 →6CuCl-------------(1)

[0021] 2. Regeneration reaction: Metal copper CuO is etched by Cu in the bath solution 2+ Oxidation and dissolution, the resulting 2Cu + The oxidizing agent NaClO added to the etching b...

Embodiment 2

[0028] PCB acidic etching solution components and the content of each component are: etching mother liquid copper (copper chloride) 150g / L, hydrochloric acid (HCl content is 36%) 140g / L, NaClO 3 200g / L, urea 1.0g / L, thiourea 1g / L, sodium chloride 200g / L, potassium chloride 25g / L, sodium hydroxide 0.2g / L, and the rest is water.

[0029] All the other are with embodiment 1.

[0030] The PCB acidic etchant used in this embodiment can control the acid value of hydrochloric acid at 1.8N, which is much lower than the 2.5N of the prior art; the etching uniformity can reach 92%; the etching factor is 3.8. The stability of the etchant and the accuracy of the etched circuit pattern are effectively guaranteed, the speed of the etched circuit pattern is effectively improved, and the usage of HCl is effectively reduced.

Embodiment 3

[0032] PCB acidic etching solution components and the content of each component are: etching mother liquid copper (copper chloride) 160g / L, hydrochloric acid (HCl content is 31%) 200g / L, NaClO 3 250g / L, sodium chloride 150g / L, thiourea 0.5g / L, potassium chloride 15g / L, urea 0.5g / L and the rest is water.

[0033] Reaction process is with embodiment 1.

[0034] The PCB acidic etchant used in this embodiment can control the acid value of hydrochloric acid at 2.0N, much lower than the 2.5N of the prior art; the etching uniformity can reach 90%; the etching factor is 3.5. The stability of the etchant and the accuracy of the etched circuit pattern are effectively guaranteed, the speed of the etched circuit pattern is effectively improved, and the usage of HCl is effectively reduced.

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PUM

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Abstract

The invention discloses a PCB (Polychlorinated Biphenyl) acidic etching solution which comprises the following components: 130-180 g / L of etching mother liquid copper, 120-200 g / L of hydrochloric acid (the concentration of the hydrochloric acid is 30%-38%), 150-250 g / L of oxidizing agents, 120-250 g / L of industrial salt, 0.5-15 g / L of stabilizing agents, 5-30 g / L of accelerating agents, 0.05-0.2 g / L of buffering agents and the balance of water. According to the PCB acidic etching solution, the acid value of the hydrochloric acid can be controlled to be less than 1.8 N and is greatly lower than the acid value less than 2.5 N in the prior art; the etching uniformity can reach more than 90%; and the etching factor is more than 3.5, so that the accuracy of an etching route figure and the stability of the etching solution are effectively ensured.

Description

technical field [0001] The invention relates to the technical field of PCB (printed circuit board) manufacturing technology, in particular to a PCB acid etching solution. Background technique [0002] In the manufacture of printed circuit boards, in addition to multiple wiring, additive methods, etc., traditional printed circuit boards use chemical reactions to remove unnecessary copper on the PCB to form the required circuit. graphics. The pattern transfer or screen printing method used as the circuit pattern part makes the photoresist of the organic compound system or the metal resist layer cover the surface of the circuit pattern to prevent the metal copper from being etched away. Therefore, the etching process is an indispensable and important step in the manufacture of printed circuit boards. The resist used in PCB acid etching solution is coated with screen printing or coated with anti-corrosion dry film, liquid photoresist and other materials, which are suitable for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/18
Inventor 陈兴农陈意军
Owner 长沙牧泰莱电路技术有限公司
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