A low-temperature, halogen-free, low-solid-content modified rosin-type flux and preparation method thereof

Abstract

The invention relates to a low-temperature, halogen-free, low-solid-content modified rosin-type welding flux. The welding flux is prepared form, by mass, 10-15% of modified rosin, 1-5% of organic acidactivator, 0.35-1% of glycerin, 0.009-1% of benzotriazole, 0.3-1 % of triethanolamine, a surfactant and the balance organic solvent, wherein the surfactant is 0.5-3% of the mass of the organic acid activator. The prepared low-temperature, halogen-free and low-solid-content modified rosin-type welding flux prepared has good fluidity, no precipitation and delamination phenomena, no halogen elements, a small amount of modified rosin, a good spreading rate, good weldability, bright and full welding spots and less residues after welding, little corrosion is caused, and cleaning is not needed; therequirements for environmental protection are met; an operation method is sample, the temperature is moderate, there are less experimental steps, the cost is low, less by-products are generated in a synthesis process and are easy to remove, and the synthesis time is short.

Description

technical field [0001] The invention belongs to the technical field of no-cleaning flux, and in particular relates to a low-temperature, halogen-free, low-solid-content modified rosin-type flux and a preparation method. Background technique [0002] As the most important auxiliary material in soldering materials (mass fraction is 10%~20%), flux is an organic mixture with comprehensive functions, which can not only provide excellent soldering performance, but also directly affect the entire production process of the electronics industry And product quality, with the rapid development of the electronics industry and the continuous improvement of electronic precision, the requirements for flux are getting higher and higher. [0003] A commonly used flux is a mixture of rosin as the main component. In rosin-type fluxes, in order to obtain better fluxing performance, it is generally necessary to use halogen salts of organic amines as activators. Both the human body and the envir...

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Problems solved by technology

[0003] A commonly used flux is a mixture of rosin as the main component. In rosin-type fluxes, in order to obtain better fluxing performance, it is generally necessary to use halogen salts of organic amines as activators. Both the human body and the environment will cause certain hazards. Researchers at home and abroad have begun to study some new types of fluxes. However, due to the strong selectivity of fluxes to solder and the high solid content and corrosiveness of post-soldering residues, therefore Many fluxes cannot meet the requirements of environmental protection and welding process

For example, some halogen-free active agents usually use organic carboxylic acids such as succinic acid, glutaric acid, adipic acid, sebacic acid and salicylic acid. Compared with halogen-containing active agents, these active agents are more active and corrosive. Low, but the ability to remove the oxide layer of solder powder and improve the wettability of solder joints is insufficient, and the fluxing performance is not high

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