Flux

A technology of flux and activator, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of residual dirt on the surface of the circuit board, prone to leakage risk, low insulation resistance, etc., and achieve low solid content. , The effect of high insulation resistance and high insulation resistance

Inactive Publication Date: 2012-06-27
广东中实金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main feature of rosin-based liquid flux is that it contains a certain amount of rosin, which has high activity and high insulation resistance. However, after soldering, the surface of the circuit board is dirty and sticky, and the problem of rosin whitening is prone to occur after a long time.
The no-cleaning liquid flux does not contain rosin or has a very low rosin content, and its activity is relatively low. On the basis of ensuring activity, it is necessary to increase the amount of other activators added, which causes the problem of low insulation resistance after soldering. There is a risk of electric leakage

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The components of the flux and the weight percent content of each component are:

[0017]

[0018] The flux is made as follows:

[0019] The solvent (isopropanol) is first added to the stirred tank, and then the active agent (succinic acid, itaconic acid, glycolic acid and dipropylene glycol methyl ether), film forming agent (hydrogenated rosin), additive (benzotriazepam, etc.) azole, stearic acid and dimethylacetamide) into the stirring tank, stirring at room temperature, when stirring until the material is completely dissolved, add a diffusing agent (non-ionic fluorosurfactant), stir and mix evenly, stop After stirring and filtering, the product is obtained, and the soldering flux of the present invention is obtained.

Embodiment 2

[0021] The components and weight percentages of the flux are:

[0022]

[0023] The flux is made as follows:

[0024] First add the solvent (ethanol) into the stirring tank, then the active agent (palmitic acid, adipic acid, butyl acetate and tripropylene glycol butyl ether), film-forming agent (polymerized rosin, acrylic rosin resin and disproportionated rosin), additives (triethylamine and ethylene glycol phenyl ether) into the stirring tank, stirring at room temperature, when stirring until the material is completely dissolved, add a diffusing agent (fatty alcohol polyoxyethylene ether), stir and mix evenly, stop stirring , which is the product after filtering to obtain the soldering flux of the present invention.

Embodiment 3

[0026] The composition and weight percentage of flux are:

[0027]

[0028] The flux is made as follows:

[0029] First add the solvent (propanol and isopropanol) into the stirred tank, then add the active agent (malonic acid, ethyl acetate, diethanolamine and ethylene glycol phenyl ether), film forming agent (water white rosin, acrylic resin, polyacrylamide and sorbitol), additives (dimethylacetamide, ethylene glycol monobutyl ether and lauramide) into the stirring tank, stirring at room temperature, when stirring until the material is completely dissolved, add the diffusing agent (perfluoroalkylammonium), after stirring and mixing evenly, stop stirring, and obtain the product after filtering to obtain the soldering flux of the present invention.

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Abstract

The invention belongs to the field of welding materials, and particularly relates to a halogen-free, low-residue, high-impedance and cleaning-free flux, which comprises the following components: 2-15wt% of activator, 0.05-2wt% of dispersing agent, 0.5-4wt% of film-forming agent, 0.1-4wt% of additive and 75-97.35wt% of solvent. Compared with the prior art, the flux has the advantages that the expansion ratio of the flux is higher than 80% of the standard, the flux is moderate in weldability and halogen-free, ionic contamination is at the highest I grade, the flux is applicable to high-reliability electronic products, the surface insulation resistance of the flux is at a 1010 grade after a copper mirror corrosion test, and the flux has the advantages that the flux is high in insulation impedance, high in insulation resistance, low in electric leakage risk, low in solid content, environment-friendly, clean and cleaning-free, residue is less, a post-weld board is tack-free and the like.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to a halogen-free, low-residue, high-impedance, no-clean flux. Background technique [0002] With the enhancement of people's awareness of environmental protection, people pay more and more attention to the halogen problem. The European Union has clearly stipulated the maximum halogen content requirements in electronic soldering materials for circuit boards. Halogen-free has become another green revolution in the electronics industry after the RoHS directive. Halogen plays a key role as an active agent in soldering flux. After halogenation, higher requirements must be placed on flux in terms of activity, stability and reliability. [0003] At present, the fluxes used in the field of electronic packaging are mainly divided into two types: rosin-based liquid fluxes and no-cleaning liquid fluxes. The main feature of rosin-based liquid flux is that it contains a certain amount of rosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
Inventor 陈锋方喜波梁静珊
Owner 广东中实金属有限公司
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