The invention discloses high-stability spot-
coating needle cylinder
solder paste and a preparation method thereof. The high-stability spot-
coating needle cylinder
solder paste is prepared from, by weight, 82.0%-88.0% of
soldering tin powder, 3.5%-5.0% of hydrogenated
rosin, 1.2%-2.0% of modified phenolic resin, 0.8%-1.5% of
adipic acid, 0.5%-1.0% of
diethylamine hydrobromide, 2.0%-3.5% of
propylene glycol methyl
ether acetate, 0.6%-1.2% of hydrogenated
castor oil, 0.3%-0.8% of
polyamide wax, 0.3%-0.8% of 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate, 0.3%-0.8% of
sodium hydroxide, 0.3%-0.8 the raw materials comprise, by weight, 0.1%-0.3% of 2, 6-
butylated hydroxytoluene, 0.2%-0.5% of polyoxyethylene
sorbitan monooleate, 0.3%-0.7% of
fumed silica, 0.05%-0.15% of
ethylene diamine tetraacetic acid disodium salt and 0.1%-0.3% of
benzotriazole; through the synergistic effect of the
soldering tin powder and the
soldering flux, the spot
coating performance of the needle cylinder
solder paste is remarkably improved,
tin output is stable in the continuous spot coating process, and the hole blocking rate is remarkably reduced. The
antioxidant, the
metal chelating agent and other components are added, oxidation and layering of the solder paste are effectively inhibited, the
viscosity change rate is low after the solder paste is stored for 30 days, and the storage stability is greatly improved.