Lead-free environmentally friendly soldering flux and preparation method thereof

A flux and environmental protection technology, which is applied in the field of solder flux preparation, can solve the problems of decreased electrical insulation performance, increased production cost, and decreased production efficiency, and achieves excellent solderability, improved production efficiency, and stable performance.

Inactive Publication Date: 2011-02-16
DANFENG RONGYI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the electronics industry and the improvement of people's awareness of environmental protection, lead-free solders are more and more widely used in the electronics industry. However, compared with traditional tin-lead solders, currently known lead-free solders also have some shortcomings and deficiencies. Its main manifestations are: ①. Existing lead-free solder residues contain a large amount of halogen ions, which will cause a decrease in electrical insulation performance, resulting in failure problems such as short circui

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0017] Example one

[0018] An embodiment of the present invention is made of raw materials containing the following mass percentages:

[0019] Polymerized rosin 0.005%,

[0020] Hydrogenated rosin 0.006%,

[0021] Succinic acid 0.5%,

[0022] Salicylic acid 0.4%,

[0023] Malic acid 0.599%,

[0024] Polyoxyethylene octylphenol ether 1.3%,

[0025] Diethylene glycol 50%,

[0026] Glycerol 47.19%.

[0027] The preparation process of the flux is: the polymerized rosin and hydrogenated rosin are pulverized by an X7-D small pulverizer, the pulverization fineness is 20-80 mesh, and the pulverization is once per 500 grams. The organic synthetic acid is pulverized at room temperature. Activator and mixed alcohol solvent are mixed according to the component formula ratio, poured into a stainless steel container, and then polymerized rosin and hydrogenated rosin powder are added to stir, stir until all the rosin is dissolved, then stop stirring, let stand for 4-6 hours, using 30 tablets The stainle...

Example Embodiment

[0028] Example two

[0029] An embodiment of the present invention is made of raw materials containing the following mass percentages:

[0030] Polymerized rosin 0.002%,

[0031] Hydrogenated rosin 0.003%,

[0032] Water white rosin 0.005%,

[0033] Oxalic acid 0.6%,

[0034] Succinic acid 0.5%,

[0035] Sorbic acid 0.5%,

[0036] Isooctylphenol polyoxyethylene ether 1.19%,

[0037] Ethylene glycol 48.5%,

[0038] Glycerol 48.7%.

[0039] The preparation method is the same as in Example 1.

Example Embodiment

[0040] Example three

[0041] An embodiment of the present invention is made of raw materials containing the following mass percentages:

[0042] Polymerized rosin 0.01%,

[0043] Oxalic acid 0.6%,

[0044] Salicylic acid 0.6%,

[0045] Sorbic acid 0.4%,

[0046] Fatty alcohol polyoxyethylene ether 1.39%,

[0047] Diethylene glycol 49.3%,

[0048] Glycerol 47.7%.

[0049] The preparation method is the same as in Example 1.

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Abstract

The invention relates to a lead-free environmentally friendly soldering flux and a preparation method thereof. The method comprises the following steps of: mixing synthetic organic acid, an activating agent and a mixed alcohol solvent at normal temperature according to a component formula; pouring an obtained mixture into a stainless steel container, and then adding modified rosin particles; stirring materials in the container until the rosins are all dissolved, and then stopping stirring; and standing still, filtering and hermetically packaging to obtain a soldering flux product. The lead-free environmentally friendly soldering flux is a no-clean soldering flux with low solid content, less rosin and no halide, has the characteristics of quick dry, bright and firm welding spot, uniform spreading, full structure, no corrosivity, excellent solderability, good soldering wetting, stable property, and the like, conforms to the property requirements of various electrical appliances and is suitable for soldering computers and peripheral equipment or high-precision multilayer board electronic assemblies. When in use, the soldering flux product has the advantages of low smoke, no pollution to working environment, no influence on the human health, no pollution to tracks and clamps of a tinning furnace, higher insulating impedance, good environment friendly performance and stronger market competitiveness.

Description

technical field [0001] The invention belongs to the technical field of solder flux preparation, and relates to a lead-free and environmentally friendly solder flux suitable for welding electronic components such as electronics, electrical engineering, printed circuit boards, aerospace industry, military industry, household appliances and other products requiring high quality and reliability. Flux and method for its preparation. Background technique [0002] With the rapid development of the electronics industry and the improvement of people's awareness of environmental protection, lead-free solders are more and more widely used in the electronics industry. However, compared with traditional tin-lead solders, currently known lead-free solders also have some shortcomings and deficiencies. Its main manifestations are: ①. Existing lead-free solder residues contain a large amount of halogen ions, which will cause a decrease in electrical insulation performance, resulting in failu...

Claims

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Application Information

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IPC IPC(8): B23K35/362
Inventor 徐保田陈元星李宏涛
Owner DANFENG RONGYI ELECTRONICS
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