Browning conditioning fluid containing sulfydryl compound

Abstract

The invention relates to a browning conditioning fluid containing sulfydryl compound. The browning conditioning fluid is the solution which is used for improving the bonding force between an inner-layer copper surface and a prepreg sheet and also can improve the copper loading amount of the browning conditioning fluid in the production and manufacture technology of the multilayer board of a printed circuit board (PCB). The browning conditioning fluid comprises 90-120g / L of sulfuric acid, 10-20g / L of hydrogen peroxide, 10-20g / L of corrosion inhibitor, 20-50mg / L of halide ion, 1.0-4.0g / L of bonding force accelerator and the balance of water which is added until the solution is 1L, wherein the bonding force accelerator is selected from a sulfydryl-substituted nitrogen-containing heterocycle compound. The copper carrying amount of the browning liquid can reach 50g / L and can be guaranteed to be 1-50g / L. The copper surface is browned to obtain an even and rough brown surface, and the copper surface is kept to have stable and favorable bonding force with the prepreg sheet and excellent heat resistance.

Description

technical field [0001] The invention relates to a browning treatment solution for improving the bonding force between the copper surface of the inner layer and the prepreg during the production process of a printed circuit board (PCB) multilayer board. Background technique [0002] The currently widely used inner layer browning process is a copper surface micro-etching chemical treatment process based on acid / hydrogen peroxide. It is named after the copper surface treated by this process is brown. Since the European and American manufacturers launched the market in the mid-to-late 1990s, the process is easy to operate, mild in conditions, high in production efficiency, and low in manufacturing costs. The treated board surface has strong acid resistance and can effectively suppress the "pink ring" The production and other characteristics of the brown oxidation process have gradually replaced the black oxidation process and become the main process for the inner layer of printe...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned browning treatment solution has a low copper content, resulting in frequent replacement of the solution in production, increasing labor intensity, reducing production efficiency, and producing a large amount of waste liquid, which is not good for the environment and does not conform to the concept of modern energy saving, emission reduction and green production.

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