PCB developing tank cleaning solution and method for cleaning developing tank by using same

Abstract

The invention provides a PCB developing tank cleaning solution and a method for cleaning a developing tank by using the same. The PCB developing tank cleaning solution comprises the following components in percentage by mass: 10-20% of ethylene glycol monobutyl ether, 15-30% of an emulsifying agent, 20-40% of acid and the balance of water. Ethylene glycol monobutyl ether is used as a bulking agent in the PCB developing tank cleaning solution to ensure that non-photosensitive solder resist ink is gradually dissolved into the PCB developing tank cleaning solution, beads formed by the solder resist ink are further decomposed into very fine particles by using emulsifying agent, a layer of milky substances is formed on the surfaces of the particles, and therefore, the non-photosensitive solder resist ink remained in a PCB developing tank is effectively cleaned under the combination action of acid and water; when the developing tank is cleaned by using the PCB developing tank cleaning solution, the PCB developing tank cleaning solution is not needed to be heated to very high temperature, the cleaning time is relatively short, and the cleaning effect is rather ideal.

Description

technical field [0001] The invention relates to the field of PCB production, in particular to a PCB developing tank cleaning solution and a method for cleaning the developing tank using the PCB developing tank cleaning solution. Background technique [0002] Most of the solder resist inks used in PCB production are photosensitive inks, which belong to the category of polyurethane. Unsensitized ink is washed away during development and becomes a paste, which is easy to adhere to the cylinder, forming dirt that is difficult to clean over time, and will block the nozzle, affect the development spray pressure, and cause poor development. Generally, PCB factories will require maintenance once a week during the production period, wash with sodium hydroxide for 2-3 hours, pickle for 1-2 hours after washing with water, and then wash with water and developer. This process is very complicated and consumes a lot of time. It lasts for 8-10 hours, and when cleaning with acid, it needs t...

AI Technical Summary

Problems solved by technology

Unsensitized ink is washed away during development, and it is a paste, which is easy to adhere to the cylinder, forming dirt that is difficult to clean over time, and will block the nozzle, affect the development spray pressure, and cause poor development

Generally, PCB factories will require maintenance once a week during the production period, wash with sodium hydroxide for 2-3 hours, pickle for 1-2 hours after washing with water, and then wash with water and developer. This process is very complicated and consumes a lot of time. It lasts for 8-10 hours, and when using acid cleaning, it needs to be heated to above 40°C

Later, some people also tried to use glacial acetic acid to clean, but because of the strong pungent smell of glacial acetic acid, few people use this method now.

Images