Halogen-free water-soluble flux with weak acidity and low corrosion

A weak corrosion and flux technology, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve problems such as damage to equipment and appliances, corrosion of soldering iron tips, high corrosiveness, etc., to expand the application field and scope , Improve production efficiency and reduce production costs

Inactive Publication Date: 2011-03-30
PERFECTION SCI & TECH DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But existing water-soluble soldering flux has following shortcoming: the one, acidity is strong, and corrosivity is big, and the damage to equipment and utensils in welding process is very big, corrodes seriously to soldering iron tip when soldering with manual soldering iron, can shorten the service life of soldering iron tip greatly. Second, most of the water-soluble fluxes contain organic halides, and the halogen ions remain on the printed circuit board during the welding process. After the soldering is completed, cleaning with water cannot ensure complete cleaning, and the residual halogens Ions are prone to electromigration, which reduces the electrical performance of the printed circuit board and seriously affects the reliability and service life of the product
In addition, the existing water-soluble flux cannot meet the industry's requirements for halogen-free products, which greatly limits the application of water-soluble flux

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1, each composition is by weight percentage (%),

[0015] DL-Malic Acid 2.5%

[0016] Glycolic Acid 2.5%

[0017] Triisopropanolamine 2%

[0018] Cyclohexylamine 1%

[0019] Tetrahydrofurfuryl Alcohol 9%

[0020] Dipropylene glycol methyl ether 6%

[0021] Surfynol 104 (alkyne diol surfactant produced by Air Products and Chemicals, USA) 0.7%

[0022] Surfynol 604 (alkyne diol surfactant produced by Air Products and Chemicals, USA) 0.3%

[0023] NP-9 (nonylphenol ethoxylate) 0.5%

[0024] NP-15 (nonylphenol ethoxylate) 0.5%

[0025] Deionized water 75%

[0026] The preparation method is: put deionized water, DL-malic acid, glycolic acid, triisopropanolamine and cyclohexylamine in a stirring tank and stir evenly, then add tetrahydrofurfuryl alcohol, dipropylene glycol methyl ether, Surfynol 104, Surfynol 604, NP-9 and NP-15 until they are evenly stirred to obtain the water-soluble flux.

Embodiment 2

[0027] Embodiment 2, each composition is by weight percentage (%),

[0028] Maleic anhydride 1%

[0029] Glycolic Acid 1%

[0030] Triisopropanolamine 1%

[0031] Triethylene glycol 1%

[0032] Surfynol 465 (alkyne diol surfactant produced by Air Products and Chemicals, USA) 0.5%

[0033] Deionized water 95.5%

[0034] The preparation method is: put deionized water, maleic anhydride, glycolic acid and triisopropanolamine in a stirring tank and stir evenly, then add triethylene glycol and Surfynol 465 in turn during the stirring process until the stirring is uniform, then The water-soluble flux is obtained.

Embodiment 3

[0035] Embodiment 3, each composition is by weight percentage (%),

[0036] DL-malic acid 0.5%

[0037] Glycolic Acid 1%

[0038] Triisopropanolamine 0.8%

[0039] Tetrahydrofurfuryl Alcohol 3%

[0040] Triethylene glycol 1%

[0041] Surfynol 465 0.5%

[0042] NP-9 0.5%

[0043] Deionized water 92.7%

[0044] The preparation method is: put deionized water, DL-malic acid, glycolic acid and triisopropanolamine in a stirring tank and stir evenly, then add tetrahydrofurfuryl alcohol, triethylene glycol, Surfynol 465 and NP- 9. Stir evenly to obtain the water-soluble flux.

[0045] The water-soluble flux prepared by the above method has excellent performance in many performance indicators, see the following table for details:

[0046] Table 1 is the comparison data of the test results of Examples 1-3 of the present invention and certain water-soluble flux products commonly used in the market, such as soldering property, acidity, copper mirror corrosion, copper plate corrosi...

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PUM

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Abstract

The invention discloses a halogen-free water-soluble flux with weak acidity and low corrosion, which comprises the following components in percentage by weight: 3 to 8 percent of organic acid and organic amine active agent, 0.5 to 2 percent of halogen-free surfactant, 1 to 15 percent of cosolvent, and the balance of deionized water. A preparation method comprises the following steps of: weighing the organic acid and organic amine active agent, the halogen-free surfactant and the cosolvent, putting the deionized water and the organic acid active agent into a stirring kettle, uniformly stirring, sequentially adding the cosolvent and the halogen-free surfactant in the stirring process, and uniformly stirring to obtain a finished product. Compared with the conventional water-soluble flux, the halogen-free water-soluble flux has the advantages that: 1, the flux has weak acidity and low corrosion, and small damage to welding equipment and appliances, improves production efficiency and reduces production cost; and 2, the flux does not contain halogens at all, so that a printed circuit board has high electric property, high reliability and long service life and meets the halogen-free requirement after being welded, and the application field and application range of the water-soluble flux are greatly expanded.

Description

technical field [0001] The invention relates to the technical field of welding supplies in the electronics industry, in particular to a brine-free water-soluble flux with weak acidity and low corrosion. Background technique [0002] At present, the electronic industry is developing rapidly. The electronic components on the circuit board are welded on the circuit board. Flux is used when soldering electronic components. Flux (flux) can remove oxides during the welding process, help and promote In the welding process, it also has the functions of preventing re-oxidation and assisting heat conduction. In recent years, water-soluble fluxes have been widely used because they avoid the use of organic solvent cleaning agents that are harmful to the human body and the atmosphere. But existing water-soluble soldering flux has following shortcoming: the one, acidity is strong, and corrosivity is big, and the damage to equipment and utensils is very big in welding process, corrodes se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/362
Inventor 徐安莲邓小安
Owner PERFECTION SCI & TECH DONGGUAN
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