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 pollutionto
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.