Circuit board character ink and printing method thereof

Abstract

The invention relates to circuit board character ink and a printing method thereof. The circuit board character ink is prepared from a main agent and a curing agent, wherein a mass ratio of the main agent to the curing agent is (0.93 to 0.94): (0.06 to 0.07), the main agent is prepared from the following components by mass percent: 35 to 37 percent of epoxy resin, 24 to 26 percent of titanium dioxide, 17 to 19 percent of barium sulfate, 9 to 11 percent of dibasic acid ester mixture and 10 to 12 percent of additives. According to the circuit board character ink disclosed by the invention, the mass percent of the main agent is increased, the mass percent of the epoxy resin, the titanium dioxide, the barium sulfate and the dibasic acid ester mixture in the main agent is adaptively adjusted, and the solid content is increased, so that the character ink is not easy to shrink after the silk printing and board baking, the ink can fill circuits and pore positions in one step, a purpose of enabling a white oil block formed on a circuit board to be smooth, flat and poreless can be achieved, the requirements of the laser carving can be met only by requiring one-time silk printing, the one-time silk printing process can be reduced, the production efficiency is increased, and the production cost can be decreased.

Description

technical field [0001] The invention relates to the field of circuit boards, in particular to a circuit board character ink and a printing method thereof. Background technique [0002] As PCB products are used more and more widely, the requirements for circuit boards are also getting higher and higher. In the past, information was added by sticking barcodes on the white oil block (character ink) of the circuit board. Now some enterprises need to use laser engraving in order to improve production efficiency and process. The laser engraving technology has strict requirements on the white oil block, and does not allow the white oil block to have unevenness, voids, etc. Now, in order to meet the requirements, the industry has to carry out secondary silk screen printing. For the first silk screen printing, first fill the uneven places in the circuit board, such as plug holes, line intervals, etc., and then bake the board, and then do the second silk screen printing to make the w...

AI Technical Summary

Problems solved by technology

However, the production process of the two silk screens is long, and at the same time it takes a lot of manpower and material resources, which affects production efficiency and increases production costs.