The invention relates to
solder paste applied to a
signal distributor. The
solder paste is composed of flux paste and
tin-based
alloy welding powder. The flux paste is obtained after 25%-40% of
solvent, 42%-50% of modified
rosin, 2%-5% of
organic acid, 2%-5% of borofluoride, 7%-10% of a thixotropic agent and 5%-10% of an
antioxidant are added in a reaction kettle to be stirred, heated to 150 DEG C and dissolved. The flux paste is evenly mixed with any one of several types of solder
powder, including Sn96.5Ag3.0Cu0.5, Sn97.5Ag2.0Cu0.5, Sn98.5Ag1.0Cu0.5, Sn99Ag0.3Cu0.7, Sn99Cu0.7, Sn42Bi58, Sn64Bi35Ag1.0, Sn64.7Bi35Ag0.3 and Sn64.9Bi35Ag0.1, in a mixing
machine according to the weight ratio being (10-15):(85-90) to obtain the
solder paste suitable for the
signal distributor. The solder paste is particularly suitable for the
signal distributor, the production cost can be reduced, and the production efficiency can be improved;
viscosity is appropriate,
thixotropy is high, the solder paste is not likely to be layered when a glue dispenser conducts dispensing, and the solder paste can be uniformly sprayed on an assigned
welding area; an oxidation film of an electroplated
coating on the surface of the solder
powder can be completely removed within 5-8 seconds, and false solder and missing solder can be prevented; and the storage life of the solder paste is long, and the solder paste can bear a high
welding temperature. Post-
soldering residues are few, and cleaning can be easily conducted through an environment-friendly
cleaning agent.