Lead-free environmentally friendly soldering flux and preparation method thereof

Abstract

The invention relates to a lead-free environmentally friendly soldering flux and a preparation method thereof. The method comprises the following steps of: mixing synthetic organic acid, an activating agent and a mixed alcohol solvent at normal temperature according to a component formula; pouring an obtained mixture into a stainless steel container, and then adding modified rosin particles; stirring materials in the container until the rosins are all dissolved, and then stopping stirring; and standing still, filtering and hermetically packaging to obtain a soldering flux product. The lead-free environmentally friendly soldering flux is a no-clean soldering flux with low solid content, less rosin and no halide, has the characteristics of quick dry, bright and firm welding spot, uniform spreading, full structure, no corrosivity, excellent solderability, good soldering wetting, stable property, and the like, conforms to the property requirements of various electrical appliances and is suitable for soldering computers and peripheral equipment or high-precision multilayer board electronic assemblies. When in use, the soldering flux product has the advantages of low smoke, no pollution to working environment, no influence on the human health, no pollution to tracks and clamps of a tinning furnace, higher insulating impedance, good environment friendly performance and stronger market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of solder flux preparation, and relates to a lead-free and environmentally friendly solder flux suitable for welding electronic components such as electronics, electrical engineering, printed circuit boards, aerospace industry, military industry, household appliances and other products requiring high quality and reliability. Flux and method for its preparation. Background technique [0002] With the rapid development of the electronics industry and the improvement of people's awareness of environmental protection, lead-free solders are more and more widely used in the electronics industry. However, compared with traditional tin-lead solders, currently known lead-free solders also have some shortcomings and deficiencies. Its main manifestations are: ①. Existing lead-free solder residues contain a large amount of halogen ions, which will cause a decrease in electrical insulation performance, resulting in failu...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the electronics industry and the improvement of people's awareness of environmental protection, lead-free solders are more and more widely used in the electronics industry. However, compared with traditional tin-lead solders, currently known lead-free solders also have some shortcomings and deficiencies. Its main manifestations are: ①. Existing lead-free solder residues contain a large amount of halogen ions, which will cause a decrease in electrical insulation performance, resulting in failure problems such as short circuits and open circuits; ②. Stronger, more residues, there are some potential adverse effects on the mechanical properties and electrical properties of the product, and cleaning a large amount of rosin residues leads to increased production costs and decreased production efficiency; ③, most of the solvents in the existing lead-free solder Use ethanol, methanol and other alcohols with low boiling points as solvent carriers, which will form photochemical smog, cause transportation difficulties and air pollution, easily cause fires, and have poor safety performance