Non-volatile organic water-based soldering flux and preparation method thereof

Abstract

The invention provides a non-volatile organic water-based soldering flux and a preparation method thereof. The soldering flux is prepared from, by mass, 2.5-7% of an active agent, 2-5% of a surfactant, 0-0.6% of a film forming agent, 0.01-0.2% of an antioxidant, 0.01-0.2% of a corrosion inhibitor, and the balance being deionized solvent water, wherein the active agent is prepared by mixing at least two of itaconic acid, pimelic acid, DL-malic acid, dimethylol butyric acid and methyl succinic acid in a corresponding mass ratio of more than 0% at 30-60 DEG C; the film forming agent is triethanolamine; the antioxidant is hydroquinone; and the corrosion inhibitor is hydroxypropyl chitosan. The water-based soldering flux has no halogen, no rosin, less solid content and small residual after welding and reduces corrosion on a circuit board; the welded surfaces are clean and bright; the volatile gas is little; the irritating odor is inexistent; the health of the operators is not affected; andthe soldering flux is environmentally friendly.

Description

technical field

[0001] The invention belongs to the chemical industry field of preparing flux for circuit welding, and relates to a water-based flux without volatile organic matter and a preparation method thereof. Background technique

[0002] Flux is an indispensable part of the welding process, and its main function is to remove oxides on the metal surface. In addition, it can also protect the welding area, reduce the surface tension of the liquid solder, improve the diffusion of the liquid solder, enhance the filling ability, and improve the heat transfer and balance of the welding area.

[0003] At present, the active ingredients of some fluxes on the market contain halogens. Fluxes containing halogens can quickly remove the oxide film of the pad and enhance the wettability of the solder. However, the addition of halogens will weaken the reliability of solder joints and cause surface insulation. The reduction of resistance will also have adverse effects on the ecologic...