Design Development and Performance Research of Eco-Friendly Film Stripping Solutions for Printed Circuit Boards

• Published in: Cai liao bao hu Vol. 57; no. 4; pp. 163 - 168
• Main Author: LI Liqing, ZHANG Lixu, XUE Ruping, OUYANG shaobo, LIN Liupeng, ZHANG Benhan, XU Yongzhang
• Format: Journal Article
• Language: Chinese
• Published: Editorial Department of Materials Protection 01.04.2024
• Subjects: printed circuit board; film stripping solution; eco-friendly
• ISSN: 1001-1560
• DOI: 10.16577/j.issn.1001-1560.2024.0090

In order to improve the environmental friendliness of the film stripping solution for printed circuit boards, through experimental research, the formula of the eco-friendly film stripping solution with inorganic alkali as the main component was determined to contain: inorganic base NaOH at 0.5 mol/L, film breaker diethylene glycolmonobutyl ether at 10 mL/L, surfactant alcohols R at 5 mL/L, tin protectant potassium citrate at 1 g/L, with the remainder pure water. The film stripping solution was found to be colorless and transparent, maintaining a stable state. Under the condition of a temperature of 50 ℃, the film was removed within 50～70 s, the size of the film ranged from 5 to 10 mm, the average tin thickness variable was less than 0.5 μm, and the ammonia nitrogen value was measured at 4.632 mg/L. Comparing the film stripping solution with products from the same production line, it was found that the film stripping performance of the two was extremely close. The eco-friendly film stripping solution exhibited