Anti-oxidation flux and preparation method thereof

Abstract

The invention discloses an anti-oxidation flux and a preparation method thereof. The anti-oxidation flux is prepared from, by weight, 100-200 parts of vegetable oil modified rosin, 120-150 parts of ethyl alcohol, 60-80 parts of carbitol, 40-120 parts of polyethylene glycol, 20-60 parts of sebacic acid, 50-80 parts of maleic acid, 90-100 parts of malic acid, 40-60 parts of citric acid, 20-30 parts of butyl acetate, 7-15 parts of malonic acid amide, 20-60 parts of nicotinamide, 10-20 parts of zinc nitrate, 20-60 parts of olein, 40-80 parts of isocyanate and 40-90 parts of dichlorodifluoromethane. The preparation method includes: adding the raw materials, performing heating reaction, adding the nicotinamide, and well stirring. The anti-oxidation flux is excellent in wettability, surface tension of welded materials is reduced, and accordingly surface oxidation of the welded materials is prevented.

Description

technical field [0001] The invention relates to an anti-oxidation flux and a preparation method thereof. Background technique [0002] In the atmosphere, the surface of the base metal to be welded is always covered by an oxide film, and its thickness is about 2×10-9~2×10-8m. During welding, the oxide film will inevitably prevent the solder from wetting the base metal, and the welding will not proceed normally. In addition, the base metal needs to be heated during the welding process, and the oxidation of the metal surface will be accelerated at high temperature. Flux is usually a mixture of rosin as the main component, which is an auxiliary material to ensure the smooth progress of the soldering process. Welding is the main process in electronic assembly. Flux is an auxiliary material used in welding. The main function of flux is to remove the oxides on the surface of the solder and the base material to be welded, so that the metal surface can reach the necessary cleanli...

AI Technical Summary

Problems solved by technology

However, this patent improves the anti-oxidation performance of the flux by adding antioxidants. During the welding process, the base metal to be welded is easily oxidized again, and the wetting time is too long to affect the anti-oxidation effect.

[0004] The Chinese patent application with the application number CN201610157719.5 discloses a new type of environmentally friendly flux, which includes solvents, surfactants and additives. The main components of the flux include deionized water, polypropylene glycol 1200, and hydroxybenzotriazole , secondary alcohol polyoxyethylene ether, tripropylene glycol butyl ether, tetraethylene glycol dimethyl ether, succinic acid and aliphatic dicarboxylic acid mixture, the solvent of the flux is different types of deionized water, alcohols and ethers Mixed composition, the mixed solvent has a suitable boiling point, more polar groups and medium viscosity, endows the flux with high activity, very little residue, and forms a protective effect on the soldering surface. Different types and components of surfactants are combined Use, has a good synergistic effect, can improve solder wettability, prevent oxidation, although the flux has a certain anti-oxidation performance, but the same, in the welding process, the base metal to be welded is easy to oxidize again, the wetting time Too long will affect the antioxidant effect