Water-based cleaning-free flux for lead-free welding flux and preparation method thereof

A lead-free solder, water-based technology, applied in the direction of welding equipment, welding/cutting media/materials, welding media, etc., can solve the problems of reducing flux activity, flux activator volatilization, and insulation performance reduction, so as to improve activation performance, surface tension reduction, and wettability improvement

Active Publication Date: 2012-04-04
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rosin-based fluxes are widely used in the electronics industry, and can be used in high-reliability products after cleaning with chlorofluorocarbons (CFCs), but such fluxes are restricted for environmental reasons
In the early 1980s, the water-soluble fluxes developed by people were usually only used for the soldering of non-electronic products, and they had to be cleaned strictly. With the development of fine-pitch devices, cleaning of micro-components was difficult due to small gaps and other rea

Method used

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  • Water-based cleaning-free flux for lead-free welding flux and preparation method thereof
  • Water-based cleaning-free flux for lead-free welding flux and preparation method thereof
  • Water-based cleaning-free flux for lead-free welding flux and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Add 0.3% of itaconic acid, 0.4% of glutaric acid and 0.3% of lactic acid, the balance of self-distilled deionized water, 0.6% of isopropanol, 1% of ethylene glycol, 1% of ethylene glycol butyl ether and Ethylene glycol ether 1%, polyethylene glycol 1000 0.62%, hydrazine hydrate 0.01%, DP-205 0.1%; after adding each component, stir at 35-45°C until completely dissolved and mixed evenly, after the mixture is cooled Filter to obtain flux.

Embodiment 2

[0037] Add 0.8% of succinic acid, 0.4% of triethanolamine and 0.4% of lactic acid, the balance of self-distilled deionized water, 1% of isopropanol, 1% of diethylene glycol, 1% of dipropylene glycol dimethyl ether and ethyl alcohol in the reaction vessel. Diol butyl ether 1%, glycerin 0.74%, hydrazine hydrate 0.03%, benzotriazole 0.01%, AP2590 0.08% and OP-10 0.46%; after adding each component, stir at 35-45°C until complete Dissolve and mix evenly, and filter to obtain flux after the mixture is cooled.

Embodiment 3

[0039] Add 1% succinic acid, 0.5% triethanolamine and 0.75% dl-malic acid successively in the reaction vessel, and the balance of self-evaporating deionized water,

[0040] Isopropyl Alcohol 0.64%, Triethylene Glycol 1.2%, Propylene Glycol Methyl Ether 1.2%, Ethylene Glycol Butyl Ether 1.2%, Polyethylene Glycol 2000 0.5%,

[0041] Hydrazine hydrate 0.04%, OP-10 0.1%; After adding each component, stir at 35-45°C until completely dissolved and mixed evenly. After the mixture is cooled, filter to obtain flux.

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Abstract

The invention discloses a water-based cleaning-free flux for a lead-free welding flux and a preparation method thereof. The flux is suitable to be coated on the welding surface of a printed circuit board by a spraying and dipping mode, and mainly comprises deionized water, a composite mixed activator, a surface active agent, a composite mixed cosolvent, a film-forming agent, a corrosion inhibitor, a microorganism growth inhibitor, and the like. According to the water-based cleaning-free flux for the lead-free welding flux, prepared by the invention, the content of a VOC (Volatile Organic Compound) is lower than 5%, so the environmental-friendliness is achieved; and as necessary, the microorganism growth inhibitor is added, so that the water-based cleaning-free flux has certain stability during the storage process. The water-based cleaning-free flux for the lead-free welding flux, prepared by the invention, has the comprehensive advantages that halogen is free, residuals are fewer, cleaning is free, dielectric resistance is high, combustion is difficult, the storage and the transportation are convenient, the environmental-protection effect is achieved, and the like; the combined circuit is simple and rapid, the raw materials are easy to obtain, and the price is lower; and the water-based cleaning-free flux for the lead-free welding flux is suitable for large scale preparation and industrial production.

Description

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Claims

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Application Information

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Owner GUANGDONG UNIV OF TECH
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