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Molten state lead-free welding flux anti-oxidation reducing agent and preparation process thereof

A lead-free solder, anti-oxidant technology, applied in welding equipment, manufacturing tools, metal processing equipment, etc., can solve the problems of short continuous use time, decreased insulation resistance, irritating odor, etc., to achieve long continuous use time, line The board surface is clean and the effect of no bad smell

Inactive Publication Date: 2010-04-14
丁璐
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

1. The reduction rate is low, mostly below 80%
2. Short continuous use time
3. Heavy smoke and pungent smell during use
4. There are obvious residues on the circuit board after soldering. If it is not cleaned, the insulation resistance will decrease. The residues are mainly alkylphenol ether surfactants and halogens after analysis.

Method used

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  • Molten state lead-free welding flux anti-oxidation reducing agent and preparation process thereof
  • Molten state lead-free welding flux anti-oxidation reducing agent and preparation process thereof
  • Molten state lead-free welding flux anti-oxidation reducing agent and preparation process thereof

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preparation example Construction

[0016] A preparation method of an oxidation-reduction agent for molten lead-free solder comprises the following steps:

[0017] a. Take the above-mentioned various raw materials by weight components.

[0018] b. First put the weighed reducing agent into a stainless steel container, heat until it is completely melted into liquid, and keep the temperature between 100-155°C.

[0019] c. Slowly and uniformly add the weighed antioxidant into the liquid prepared in step b while stirring, the stirring speed is 40-60n / min, and stop heating after stirring at the above temperature for 20-30min.

[0020] d. Continue to stir the material prepared in step c. When the temperature drops to 30-40°C, add a dispersion accelerator while stirring, and then stir for 0.5-1h to obtain the product of the present invention.

[0021] The oxidation-reduction principle of the present invention is: the melting point of antioxidant, potassium fluoroborate, zinc fluoroborate, tin fluoroborate, potassium fl...

Embodiment 1

[0033] Composition of anti-oxidation reducing agent raw materials: glutaric acid 18kg, potassium fluoroborate 30kg, tin fluoroborate 50kg, triethylenetetramine 2kg.

[0034] Preparation:

[0035] Put the glutaric acid in a stainless steel container and heat it until it completely melts into a liquid, keeping the temperature at 100°C.

[0036] Potassium fluoroborate and tin fluoroborate were slowly and uniformly added to the prepared liquid, stirred at 100° C. for 25 min at a stirring speed of 50 n / min, and then stopped heating.

[0037] Continue to stir the materials prepared above, when the temperature drops to 40°C, add triethylenetetramine, and stir for another 0.5h to obtain the oxidation-reducing agent of the present invention.

Embodiment 2

[0039] Composition of anti-oxidation reducing agent raw materials: suberic acid 2kg, adipic acid 10kg, sebacic acid 14kg, zinc fluorosilicate 31kg, sodium tetraborate 38kg, diethylenetriamine 3kg, triethylenetetramine 2g.

[0040] Preparation:

[0041] Put suberic acid, adipic acid, and sebacic acid in a stainless steel container, heat until they all melt into liquid, and keep the temperature at 155°C.

[0042] Zinc fluoroborate and sodium tetraborate were slowly and uniformly added to the prepared liquid, stirred at 155°C for 30min at a stirring speed of 60 / min, and then stopped heating.

[0043] Continue to stir the above-prepared materials, when the temperature drops to 30°C, add diethylenetriamine and triethylenetetramine, and stir for 1 hour to obtain the oxidation-reducing agent of the present invention.

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Abstract

The invention relates to a molten-state lead-free welding flux anti-oxidation reducing agent and a preparation process thereof, which comprise a reducing agent, an antioxidant and a dispersing accelerating agent. The preparation process includes: placing the weighed reducing agent into a stainless steel container, heating the container until the reducing agent is completely melted into liquid, keeping temperature within 100 DEG C-155 DEG C; then stirring and slowly adding the weighed antioxidant into the container at an even speed, adding the dispersing accelerating agent after stopping heating, and further stirring to obtain the molten-state lead-free welding flux anti-oxidation reducing agent. The molten-state lead-free welding flux anti-oxidation reducing agent has the advantages of apparent anti-oxidation effect, high reducing efficiency, long continuous service time, small smoke, no unpleasant odor, and economical and practical properties.

Description

technical field [0001] An anti-oxidation reduction agent for molten lead-free solder, which is applied to the surface of molten lead-free soldering tin furnace, can reduce the oxidation of solder at high temperature, and can reduce the oxidized tin. It belongs to the lead-free electronic Product assembly and welding technology field. Background technique [0002] During the assembly and welding process of electronic products, due to the continuous high-temperature heating of the solder furnace, the surface of the molten lead-free solder will continuously produce oxidized tin slag, which floats on the surface of the tin liquid, especially under the mechanical action of the wave solder furnace, the oxidation is accelerated, and a large amount of The tin slag falls into the tin furnace tank, and at the same time, a small amount of tin slag will be brought back to the tin wave peak in the form of ribbons, which not only affects the welding quality of the product, but also wastes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/08C22B5/00C22B7/04C22B25/06H05K3/34
CPCY02P10/20
Inventor 丁璐
Owner 丁璐
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