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Low-smoke non-toxic soldering flux for circuit board soldering

A flux and circuit board technology, applied in welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of smoke, unpleasant smell, harm to the health of welding operators, avoid corrosion and improve reliability , Improve the effect of unpleasant odor

Inactive Publication Date: 2018-06-29
HEFEI DONGHENGRUI ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional fluxes contain halides, rosin, and organic solvents. Rosin and other components of fluxes are volatile at high temperatures and produce smoke and unpleasant odors. In addition, some halides and organic substances may also produce toxic substances when chemical reactions occur at high temperatures. Harm to the health of welding operators

Method used

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  • Low-smoke non-toxic soldering flux for circuit board soldering
  • Low-smoke non-toxic soldering flux for circuit board soldering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A low-smoke non-toxic flux for circuit board soldering. According to the mass parts, the composition of the flux includes: 80 parts of low-smoke modified rosin, 6 parts of hydrogenated rosin methyl ester, 3 parts of zinc chloride, 2 parts of ammonium chloride 5 parts of hydrochloric acid, 1 part of polyglycol, 3 parts of glycerin, 2 parts of citric acid, 15 parts of organic solvent, 1 part of co-solvent, 2 parts of lubricant, 4 parts of thixotropic agent, and 3 parts of fragrance.

[0020] Among them, the preparation method of low-smoke modified rosin is as follows: rosin resin and cyclohexane are added to the reactor according to the mass ratio of 3:1, dissolved at a temperature of 150 ° C, and the nickel-based catalyst is added to the reactor. Simultaneously vacuumize the inside of the reactor, then fill the reactor with hydrogen, keep the pressure in the reactor at 8MPa, react for 3h, depressurize the reactor after the reaction, and remove the residual cyclohexane by ...

Embodiment 2

[0024] A low-smoke non-toxic flux for circuit board soldering. According to parts by mass, the composition of the flux includes: 90 parts of low-smoke modified rosin, 10 parts of hydrogenated rosin methyl ester, 6 parts of zinc chloride, and 5 parts of ammonium chloride 7 parts of hydrochloric acid, 2 parts of polyglycol, 5 parts of glycerin, 4 parts of citric acid, 20 parts of organic solvent, 3 parts of co-solvent, 3 parts of lubricant, 7 parts of thixotropic agent, and 5 parts of fragrance.

[0025] Among them, the preparation method of low-smoke modified rosin is as follows: rosin resin and cyclohexane are added to the reactor according to the mass ratio of 3:1, dissolved at a temperature of 180 ° C, and the nickel-based catalyst is added to the reactor. Simultaneously vacuumize the inside of the reactor, then fill the reactor with hydrogen, keep the pressure in the reactor at 10MPa, react for 5h, depressurize the reactor after the reaction, and remove the residual cyclohex...

Embodiment 3

[0029] A low-smoke non-toxic flux for circuit board soldering. According to the mass parts, the composition of the flux includes: 85 parts of low-smoke modified rosin, 8 parts of hydrogenated rosin methyl ester, 4 parts of zinc chloride, 3 parts of ammonium chloride 6 parts of hydrochloric acid, 1.5 parts of polyglycol, 4 parts of glycerin, 3 parts of citric acid, 17 parts of organic solvent, 2 parts of cosolvent, 2.5 parts of lubricant, 6 parts of thixotropic agent, and 4 parts of aromatic agent.

[0030] Among them, the preparation method of low-smoke modified rosin is as follows: rosin resin and cyclohexane are added to the reactor according to the mass ratio of 3:1, dissolved at a temperature of 165 ° C, and the nickel-based catalyst is added to the reactor. Simultaneously vacuumize the inside of the reactor, then fill the reactor with hydrogen, keep the pressure in the reactor at 9MPa, react for 4h, depressurize the reactor after the reaction, and remove the residual cyclo...

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Abstract

The invention belongs to the technical field of soldering materials, and particularly relates to a low-smoke non-toxic soldering flux for circuit board soldering. The soldering flux comprises the following components of low-smoke modified rosin, hydrogenated rosin methyl ester, zinc chloride, ammonium chloride, hydrochloric acid, polyethylene glycol, glycerol, citric acid, an organic solvent, a cosolvent, a lubricant, a thixotropic agent and an aromatic; and when the modified rosin is used, the content of smoke is low; the components of the cosolvent comprise sodium benzoate and sodium salicylate; the lubricant is nonylphenol polyoxyethylene ether; and the thixotropic agent is hydrogenated castor oil. According to the soldering flux, the soldering effect is excellent, the solderability ofthe soldering flux can be remarkably improved, the soldering flux does not need to be cleaned after soldering, the amount of the smoke generated in the soldering process is low, volatile substances are fragrant, and poisonous and harmful peculiar smell gas is prevented from being generated.

Description

technical field [0001] The invention belongs to the technical field of soldering materials, and in particular relates to a low-smoke and non-toxic flux for circuit board soldering. Background technique [0002] Some small integrated circuit boards need to manually solder electronic components to the universal board. This kind of integrated circuit board has a high degree of personalization. Customers can design circuits and use corresponding electronic components according to work needs, and manually weld the relevant components on the universal board. Above; this kind of circuit board has practical performance, long service life, low failure rate, and relatively low manufacturing cost, which is very suitable for application in equipment with relatively low output. [0003] Welding circuits are usually completed by soldering. In addition to solder, flux is also used during soldering. Flux can improve the quality of solder joints, make component welding more stable, and form ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
CPCB23K35/3613B23K35/362
Inventor 齐慧
Owner HEFEI DONGHENGRUI ELECTRONICS TECH CO LTD
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