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Environment-friendly soldering paste and preparing method thereof

A solder paste, environmental protection technology, applied in the direction of welding equipment, welding medium, manufacturing tools, etc., can solve the problems of physical and environmental hazards, failure of electronic product parts, etc., and achieve the effect of good printing performance

Inactive Publication Date: 2016-09-07
深圳市唯特偶新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Halogen-containing solder paste volatilizes halogen-containing fumes during soldering, which will cause harm to the body and the environment, and the fumes will generate halogen acids after absorbing water, which will cause electronic product components to fail

Method used

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  • Environment-friendly soldering paste and preparing method thereof
  • Environment-friendly soldering paste and preparing method thereof
  • Environment-friendly soldering paste and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An environmentally friendly solder paste is composed of 90wt% solder powder and 10wt% solder paste, and the solder powder is composed of the following weight ratios:

[0029] Silver (Ag) 2%

[0030] Copper (Cu) 0.5%

[0031] Tin (Sn) 97.5%;

[0032] Described flux paste is made up of the material of following weight ratio:

[0033]

[0034]

[0035] Concrete preparation method comprises the following steps:

[0036] 1. Preparation of solder powder

[0037] Put tin, silver and copper in the container, stir and mix to become solder powder;

[0038] 2. Preparation of solder paste

[0039] Put the organic solvent and organic acid activator in a reaction kettle with a stirrer, heat to 110°C-130°C, stir to mix evenly, after the solid content is completely dissolved, add the modified rosin; after it is completely dissolved Add corrosion inhibitor, hydrogenated castor oil and surfactant; after they are mixed evenly, add paraffin wax and polyethylene glycol 2000, sti...

Embodiment 2

[0042] An environmentally friendly solder paste is composed of 90wt% solder powder and 10wt% solder paste, and the solder powder is composed of the following weight ratios:

[0043] Silver (Ag) 2%

[0044] Copper (Cu) 0.5%

[0045] Tin (Sn) 97.5%;

[0046] Described flux paste is made up of the material of following weight ratio:

[0047]

[0048] Concrete preparation method is identical with embodiment 1.

Embodiment 3

[0050] An environmentally friendly solder paste is composed of 90wt% solder powder and 10wt% solder paste, and the solder powder is composed of the following weight ratios:

[0051] Silver (Ag) 2%

[0052] Copper (Cu) 0.5%

[0053] Tin (Sn) 97.5%;

[0054] Described flux paste is made up of the material of following weight ratio:

[0055]

[0056]

[0057] Concrete preparation method is identical with embodiment 1.

[0058] The solder pastes of Examples 1-3 above were inspected according to the standard SJ / T11188, and the indicators are shown in Table 1 below.

[0059] Table 1

[0060]

[0061] After testing, the solder paste of the present invention does not contain halogen, and the insulation resistance of the printed board after welding and power-on wet test is >1.8×10 9 Ω, expansion rate ≥ 75%, solder paste physical stability, copper mirror corrosion test, viscosity are all qualified, the residue after soldering is a colorless and transparent film, stable at ...

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Abstract

The invention discloses environment-friendly soldering paste and a preparing method thereof. The environment-friendly soldering paste is composed of, by weight percent, 90% of soldering powder and 10% of flux paste. The soldering powder is composed of, by weight percent, 2% of silver, 0.5% of copper and 97.5% of tin. The flux paste is composed of, by weight percent, 10% of an organic acid activating agent, 20% of an organic solvent, 5% of polyethylene glycol 2000, 2% of paraffin, 4% of hydrogenated castor oil, 4% of a surface active agent, 5% of a corrosion inhibitor and 50% of modified rosin. The preparing method of the environment-friendly soldering paste includes preparing of the soldering powder and preparing of the flux paste; and then the soldering powder and the flux paste are sufficiently mixed to obtain the environment-friendly soldering paste. The soldering powder of the environment-friendly soldering paste does not contain lead, the flux paste does not contain halogen, environment friendliness is better facilitated, residues are few after welding, cleaning is not needed, the spreadability of welding flux is good, a copper mirror cannot be pierced after the prepared soldering paste is welded, and the requirement for packaging high-end precise electronic products can be met.

Description

technical field [0001] The invention relates to an environment-friendly solder paste and a preparation method thereof. Background technique [0002] At present, due to the effective promotion of factors such as environmental protection, lead ban regulations and market competition, the global electronics industry has set off an upsurge in research and development of new lead-free solders to replace traditional tin-lead solders. Among them, Sn-Ag-Cu alloy has become one of the most promising lead-free solders due to its wetting and spreading properties closest to that of tin-lead eutectic solder, good mechanical properties, and easy availability of raw materials. The halogens commonly used in the flux in solder paste are chlorine (Cl), bromine (Br), and fluorine (F). These halogen compounds have strong activity and can enhance the ability of solder paste to remove oxides on the surface of the metal to be welded. . Therefore, in the solder paste used for electronic connection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/26B23K35/363B23K35/40
CPCB23K35/025B23K35/262B23K35/3612B23K35/3613B23K35/362B23K35/40
Inventor 刘竞郑世忠刘芳李维俊廖高兵
Owner 深圳市唯特偶新材料股份有限公司
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