BE1022204B1 - A NON-WASHABLE LIQUID ALUMINUM WELDING FLOW AND PROCESS FOR PREPARING THE SAME - Google Patents

Abstract

The present invention relates to a non-washable liquid aluminum solder flux and its preparation process comprising the following steps: 1) depending on the percentage by weight, weighing the hydroxylamine fluoride from 60 to 85%, the active metal salt of 5 to 30%, the active agent from 1 to 5% and the corrosion inhibitor from 0.1 to 5%, mix them evenly to obtain a ready-to-use active substance; 2) depending on the weight percentage, weighing the aforementioned active substance 15-30% and said solvent 70-85% respectively to ready for use; 3) Mix the above-mentioned well-weighed solvent and active substance, and keep stirring during mixing, and then heat them up to 50-60 ° C, stir them for a period of 8-12 minutes, and put them in a sealed container to keep. In this way, it is thus able to obtain the non-washable liquid aluminum solder flux. The non-washable liquid aluminum solder flux of the object of the present invention is characterized by good solderability, high soldering efficiency; small projection during welding, scarcity of projection, welding economy, rare residue after welding, no need to clean welding joints and long service life.

Description

A soldering flux of non-washable liquid aluminum and its preparation process

Technical field of the invention

The present invention relates to a flux to be welded, and particularly to the non-washable liquid aluminum soldering flux and its method of preparation which are applicable in the electronic industrial field of aluminum solder products. State of the art

Currently, as the electronics and electrical industry progressively progresses, demands on series soldering materials are becoming higher, while the importance of human health is also being drawn. . A series of measures are recommended and taken by developed countries to improve the global environment for human survival. And the correction period is also proposed by the United Nations to correct requirements of harmful substances in the atmosphere. And for the electronics and electrical industry sector, because of the high reliability requirements on certain products, the existing soldering flux only guarantees product performance after welding of the components to be welded for performance reasons. However, the majority of cleaning products currently used contain hydrocarbon compounds such as fluorine, the chlorine substituent. And these substances have serious adverse effects on the ozone layer and belong to the areas of production and use prohibition within the time period proposed by ΓΕΡΑ, while the exploitation of these substances will produce considerable toxic effects on the health of the ozone layer. operators. Focusing on these elements, there is an urgent need for the electronics and electrical sector to improve existing processes in order to achieve the objective of protecting man and the atmospheric environment. Among which, an important measure is the use of the non-washable soldering flux. And some establishments in the country contribute to research and develop the non-washable soldering flux, but there are disadvantages such as bad foam when welding the non-washable soldering flux. And said product is generally used to carry out spraying.

At present, the application of aluminum solder products is becoming more and more extensive in the field of the electronics industry. As a relatively difficult metal to weld, aluminum is rarely used in the field of civil electronic soldering. But with the ever-increasing cost, the demand for copper replacement by aluminum by companies is more and more urgent in order to stimulate the development of applicable aluminum soldering technologies, from aluminum to aluminum. using a liquid type flow. At present, a relatively common form of welding is the use of the aluminum solder flux as a liquid. For example, when welding some small aluminum components, the flux to be welded aluminum with tempered liquid will be immersed in the tin furnace. This type of welding which is characterized by high efficiency and obtaining smooth welding surface, has been widely adopted in the practical production. At present, the most typical problems generally existing in similar commercialized products are: 1 Active welding insufficiently. It is characterized by the modest adhesion of tin and the exposure of aluminum in the tinned surface. 2 Strong residual welding corrosion. To improve the activity, the existing soldering flux generally uses high activity acids or alkalis. At the end of welding, the active substance can not be completely volatile, and a large quantity of the corrosive substances is residual in the welding and will thus cause the considerable reduction of the lifetime of the solder joint.

Disclosure of the invention

The inventor aims to provide a non-washable aluminum liquid soldering flux which is intended to overcome such problems as modest adhesion of tin, exposure of aluminum in the tinned surface, insufficient activity of welding, large residual corrosion welding, etc.

The technical solution of the present invention is carried out by the following modes: according to the weight percentage, a non-washable liquid aluminum welding flux comprises the active substance of 15 to 30% and the solvent of 70 to 85%. Among them, for said active substance, according to the weight percentage, it contains hydroxylamine fluoride of 60 to 85%, the active metal salt of 5 to 30%, the active agent of 1 to 5% and the inhibitor corrosion of 0.1 to 5%.

As the preferred technical solution, said active substance, according to the weight percentage, comprises 80% hydroxylamine fluoride, 15% active metal salt, 2% active agent and the corrosion inhibitor of 3%.

As the preferred technical solution, said process for the preparation of hydroxylamine fluoride comprises the following steps: 1) Depending on the weight percentage, take ethylene diamine from 1 to 5%, ethanolamine from 3 to 30% , ethanolamine from 20 to 90%, and triethanolamine from 5 to 80%, mix them uniformly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 6.5 to 8; 3) Evaporate the above-mentioned neutralized product at 140 to 160 ° C for a period of 3.5 to 4.5 hours.

As a preferred technical solution, said metal active salt is the combination of one or more of the products of tin fluoride, stannous fluoride, stannous fluorite borate, stannous chloride, zinc fluoride, fluorite borate zinc, zinc chloride or bismuth chloride.

As a preferred technical solution, said active agent is the combination of one or more of the products of diethylamine hydrochloride, triethylamine hydrochloride, lithium fluoride, sodium fluoride, magnesium fluoride and fluoride. 'aluminum.

As a preferred technical solution, said solvent is the combination of one or more of the products of water, ethanol, isopropanol, glycol, and propylene glycol.

As a preferred technical solution, said corrosion inhibitor is benzotriazole and / or piperazine.

The present invention also provides a method for preparing the nonwash liquid aluminum soldering flux comprising the following steps: 1) Based on the weight percentage, weigh the hydroxylamine fluoride 60 to 85%, the active metal salt from 5 to 30%, the active agent from 1 to 5% and the corrosion inhibitor from 0.1 to 5%, to mix them uniformly to obtain a ready-to-use active substance; 2) Depending on the weight percentage, respectively weighing the above-mentioned active substance from 15 to 30% and said solvent from 70 to 85% to be ready for use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

As a preferred technical solution, depending on the weight percentage, weigh hydroxylamine fluoride 80%, metal salt 15%, active agent 2% and corrosion inhibitor 3%, mix them evenly to obtain a ready-to-use active substance.

As a preferred technical solution, said metal active salt is the combination of one or more of the products of tin fluoride, stannous fluoride, stannous fluorite borate, stannous chloride, zinc fluoride, fluorite borate zinc, zinc chloride or bismuth chloride. Said active agent is the combination of one or more diethylamine hydrochloride products, triethylamine hydrochloride, lithium fluoride, sodium fluoride, magnesium fluoride and aluminum fluoride. Said solvent is the combination of one or more products of water, ethanol, isopropanol, glycol, and propylene glycol. And said corrosion inhibitor is benzotriazole and / or piperazine.

Due to the application of the technical solutions, a solder flux of non-washable liquid aluminum, according to the percentage of weight, the active substance of 15 to 30% and the solvent of 70 to 85%. Among them, for said active substance, according to the weight percentage, it contains hydroxylamine fluoride of 60 to 85%, the active metal salt of 5 to 30%, the active agent of 1 to 5% and the inhibitor corrosion of 0.1 to 5%. And it is characterized by good weldability, high welding efficiency; the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the welding joints and the long service life. Descriptions of figures

Figure 1 gives the process flow diagram for hydroxylamine fluoride.

FIG. 2 gives the flow diagram of the non-washable liquid aluminum welding flux preparation process.

Embodiments of the invention

By combining the accompanying figures in the embodiments of the invention, he is able to clearly and completely describe the technical solution proposed in the present invention. Obviously, the described embodiments are only part of the present invention but not all. Based on these embodiments of the invention, all other embodiments achieved by ordinary technicians in the present field with the absence of non-creative work will be within the scope of the present invention. According to FIG. 1 and FIG. 2, the technical solution of the present invention is realized by the following modes: as a function of the weight percentage, a non-washable liquid aluminum welding flux comprises the active substance from 15 to 30 % and the solvent from 70 to 85%. Among them, for said active substance, according to the weight percentage, it contains hydroxylamine fluoride of 60 to 85%, the active metal salt of 5 to 30%, the active agent of 1 to 5% and the inhibitor corrosion of 0.1 to 5%.

Said active substance, according to the weight percentage, comprises 80% hydroxylamine fluoride, 15% active metal salt, 2% active agent and 3% corrosion inhibitor.

Said method for preparing hydroxylamine fluoride comprises the following steps: 1) Depending on the percentage of weight, take ethylene diamine from 1 to 5%, ethanolamine from 3 to 30%, ethanolamine from 20 to 90% %, and triethanolamine 5 to 80%, mix them evenly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 6.5 to 8; 3) Evaporate the above-mentioned neutralized product at 140 to 160 ° C for a period of 3.5 to 4.5 hours.

The said metal active salt is the combination of one or more of the products of tin fluoride, stannous fluoride, stannous fluorite borate, stannous chloride, zinc fluoride, zinc fluorite borate, zinc chloride or zinc fluoride. bismuth chloride.

Said active agent is the combination of one or more diethylamine hydrochloride products, triethylamine hydrochloride, lithium fluoride, sodium fluoride, magnesium fluoride and aluminum fluoride.

Said solvent is the combination of one or more products of water, ethanol, isopropanol, glycol, and propylene glycol.

The said corrosion inhibitor is benzotriazole and / or piperazine.

A process for preparing the non-washing liquid aluminum soldering flux comprises the following steps: 1) Depending on the percentage of weight, the hydroxylamine fluoride weigh 60 to 85%, the active metal salt 5 to 30%, the active agent of 1 to 5% and the corrosion inhibitor of 0.1 to 5%, to mix them uniformly to obtain a ready-to-use active substance; 2) Depending on the weight percentage, respectively weighing the above-mentioned active substance from 15 to 30% and said solvent from 70 to 85% to be ready for use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The said metal active salt is the combination of one or more of the products of tin fluoride, stannous fluoride, stannous fluorite borate, stannous chloride, zinc fluoride, zinc fluorite borate, zinc chloride or zinc fluoride. bismuth chloride.

Said active agent is the combination of one or more diethylamine hydrochloride products, triethylamine hydrochloride, lithium fluoride, sodium fluoride, magnesium fluoride and aluminum fluoride.

Said solvent is the combination of one or more products of water, ethanol, isopropanol, glycol, and propylene glycol. I Preparation of hydroxylamine fluoride Example 1

The process for the preparation of hydroxylamine fluoride comprises the following steps: 1) Based on the weight percentage, take ethylene diamine of 1%, ethanolamine of 30%, ethanolamine of 64%, and triethanolamine of 5%, mix them evenly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 6.5; 3) Evaporate the above neutralized product at 140 ° C for a period of 4.5 hours to remove water and avoid the next welding spatter.

Example 2

The process for preparing the hydroxylamine fluoride comprises the following steps: 1) Depending on the weight percentage, take ethylene diamine of 5%, ethanolamine of 3%, ethanolamine of 84%, and triethanolamine of 8%, mix them evenly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 7; 3) Evaporate the above neutralized product at 160 ° C for 3.5 hours to remove water and avoid the next weld spatter.

Example 3

The process for preparing the hydroxylamine fluoride comprises the following steps: 1) Depending on the weight percentage, take 2% ethylene diamine, 3% ethanolamine, 20% ethanolamine, and triethanolamine. 75%, mix them evenly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 8; 3) Evaporate the above-mentioned neutralized product at 150 ° C for 4 hours to remove water and avoid the next weld spatter.

Example 4

The process for preparing the hydroxylamine fluoride comprises the following steps: 1) Depending on the weight percentage, take 2% ethylene diamine, 3% ethanolamine, 90% ethanolamine, and triethanolamine. 5%, mix them evenly to obtain a mixture; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 7; 3) Evaporate the above-mentioned neutralized product at 155 ° C for 4.5 hours to remove water and avoid the next weld spatter. II Preparation of the solder flux of non-washable liquid aluminum Example 5

A process for preparing the non-washing liquid aluminum weld stream comprises the following steps: 1) Based on the weight percentage, weigh the 80% hydroxylamine fluoride prepared in Example 1, the 15% tin fluoride 2% diethylamine hydrochloride and 3% benzotriazole, mix them uniformly to obtain an active substance and ready to use; 2) According to the percentage by weight, respectively weighing the active substance of 15%, water of 50%, ethanol of 35% to lend to use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The non-washable liquid aluminum welding flux prepared in the present example is characterized by the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the joints Welding and long service life.

Example 6

A process for preparing the non-washing liquid aluminum soldering flux comprises the following steps: 1) Depending on the weight percentage, weigh the 60% hydroxylamine fluoride prepared in Example 2, the stannous fluoride of 30%, the 5% lithium fluoride and 5% piperazine, mix them evenly to obtain an active substance and ready to use; 2) Based on the weight percentage, respectively weighing the active substance by 30%, isopropyl alcohol 20%, glycol 20% and propylene glycol 30% ready to use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The non-washable liquid aluminum welding flux prepared in the present example is characterized by the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the joints Welding and long service life.

Example 7

A process for preparing the non-washing liquid aluminum weld stream comprises the following steps: 1) Based on the weight percentage, weigh the 85% hydroxylamine fluoride prepared in Example 3, the 5% zinc fluorite borate , 2.5% triethylamine hydrochloride, 2.5% sodium fluoride, 2% benzotriazole and 3% piperazine, mix them uniformly to obtain an active substance and ready to use; 2) Depending on the percentage by weight, weigh 25% of the active substance and 75% of the water, respectively, to be ready for use; Mix the above-mentioned well-weighed solvent and active substance, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and put in a waterproof container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The non-washable liquid aluminum welding flux prepared in the present example is characterized by the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the joints Welding and long service life.

Example 8

A process for preparing the non-washing liquid aluminum weld stream comprises the following steps: 1) Based on the weight percentage, weigh the 83% hydroxylamine fluoride prepared in Example 4, the 5% stannous fluorite borate, 5% zinc fluoride, 5.9% bismuth chloride, 0.25% diethylamine hydrochloride, 0.25% triethylamine hydrochloride, 0.25% magnesium fluoride, fluoride of 0.25% aluminum, benzotriazole 0.1%, mix them uniformly to obtain an active substance and ready to use; 2) Based on the weight percentage, respectively weighing the active substance of 20% and isopropanol 80% to be ready to use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The non-washable liquid aluminum welding flux prepared in the present example is characterized by the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the joints Welding and long service life.

Example 9

A process for preparing the non-washing liquid aluminum soldering flux comprises the following steps: 1) Depending on the weight percentage, the hydroxylamine fluoride of 83% prepared in Example 2, the stannous fluoride of 5%, the zinc fluoride 5%, stannous fluorite borate 5%, zinc fluorite borate 0.9%, diethylamine hydrochloride 0.5%, triethylamine hydrochloride 0.5%, benzotriazole 0 , 1%, mix them evenly to obtain an active substance and ready to use; 2) According to the percentage by weight, respectively weighing the active substance of 23%, ethanol 15%, isopropyl alcohol 30%, glycol 17% and propylene glycol 15% ready to use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum.

The non-washable liquid aluminum welding flux prepared in the present example is characterized by the small projection during welding, the scarcity of projection, the welding economy, the rare residue after welding, the need not to clean the joints Welding and long service life.

Above modes are only the optimal modes of the present invention, and can not be used to limit the present invention. All modifications, equivalent substitutions, improvements in the spirit and principle of the present invention will be within the scope of the present invention.

Claims (10)

2014/01 Claims 1. A nonwashable liquid aluminum welding flux characterized by, according to the weight percentage, it comprises the active substance of 15 to 30% and the solvent of 70 to 85%. Among them, for said active substance, according to the weight percentage, it contains hydroxylamine fluoride of 60 to 85%, the active metal salt of 5 to 30%, the active agent of 1 to 5% and the inhibitor corrosion of 0.1 to 5%. The non-washable liquid aluminum solder flux of claim 1, wherein said active substance, by weight percentage, comprises 80% hydroxylamine fluoride, 15% metal active salt, 2% active and the 3% corrosion inhibitor. The non-washable liquid aluminum solder flux of claim 2, wherein said process for preparing the hydroxylamine fluoride comprises the following steps: 1) Based on the weight percentage, take the ethylene diamine from 1 to 5%, ethanolamine of 3 to 30%, ethanolamine of 20 to 90%, and triethanolamine of 5 to 80%, mix and shake evenly to obtain a mixture and ready to use; 2) Use hydrofluoric acid to neutralize the resulting mixture to a pH value of 6.5 to 8 to obtain the neutralized product; 3) Evaporate the neutralized product obtained above at 140 to 160 ° C for a period of 3.5 to 4.5 hours. The non-washable liquid aluminum solder flux of claim 2, wherein said metal active salt is the combination of one or more of tin fluoride, stannous fluoride, stannous fluoritic borate, chloride stannous, zinc fluoride, zinc fluorite borate, zinc chloride or bismuth chloride. The non-washable liquid aluminum solder flux of claim 2, wherein said active agent is the combination of one or more of the products of diethylamine hydrochloride, triethylamine hydrochloride, lithium fluoride, sodium fluoride and the like. sodium, magnesium fluoride and aluminum fluoride. The non-washable liquid aluminum solder flux of claim 2, wherein said solvent is the combination of one or more of the products of water, ethanol, isopropanol, water and water. glycol, and propylene glycol. The non-washable liquid aluminum solder stream of claim 2, wherein said corrosion inhibitor is benzotriazole and / or piperazine. The process for preparing the unwashed liquid aluminum soldering flux of claims 1 to 7, wherein, comprises the following steps: 1) Based on the weight percentage, weigh the hydroxylamine fluoride from 60 to 85% the metal active salt of 5 to 30%, the active agent of 1 to 5% and the corrosion inhibitor of 0.1 to 5%, mix them uniformly to obtain a ready-to-use active substance; 2) Depending on the weight percentage, respectively weighing the above-mentioned active substance from 15 to 30% and said solvent from 70 to 85% to be ready for use; 3) Mix the above-mentioned well-weighed solvent and active ingredient, and maintain stirring during mixing, and then heat to 50-60 ° C, shake for 8-12 minutes, and apply in a sealed container to keep. In this way, it is thus able to obtain the soldering flux of non-washable liquid aluminum. The process for preparing the unwashed liquid aluminum soldering flux of claim 8, wherein, depending on the weight percentage, the hydroxylamine fluoride is 80%, the active metal salt is 15%, the agent is 2% active and the 3% corrosion inhibitor, mix them evenly to obtain the active substance and ready to use. The process for preparing the unwashed liquid aluminum solder stream of claim 8, wherein said metal salt is the combination of one or more of the tin fluoride, stannous fluoride, fluorite borate products. stannous, stannous chloride, zinc fluoride, zinc fluorite borate, zinc chloride or bismuth chloride; Said active agent is the combination of one or more of the products of diethylamine hydrochloride, triethylamine hydrochloride, lithium fluoride, sodium fluoride, magnesium fluoride and aluminum fluoride; Said solvent is the combination of one or more products of water, ethanol, isopropanol, glycol, and propylene glycol; The said corrosion inhibitor is benzotriazole and / or piperazine.