A low-temperature, halogen-free, low-solid-content modified rosin-type flux and preparation method thereof

Abstract

The invention relates to a low-temperature, halogen-free, low-solid-content modified rosin-type welding flux. The welding flux is prepared form, by mass, 10-15% of modified rosin, 1-5% of organic acidactivator, 0.35-1% of glycerin, 0.009-1% of benzotriazole, 0.3-1 % of triethanolamine, a surfactant and the balance organic solvent, wherein the surfactant is 0.5-3% of the mass of the organic acid activator. The prepared low-temperature, halogen-free and low-solid-content modified rosin-type welding flux prepared has good fluidity, no precipitation and delamination phenomena, no halogen elements, a small amount of modified rosin, a good spreading rate, good weldability, bright and full welding spots and less residues after welding, little corrosion is caused, and cleaning is not needed; therequirements for environmental protection are met; an operation method is sample, the temperature is moderate, there are less experimental steps, the cost is low, less by-products are generated in a synthesis process and are easy to remove, and the synthesis time is short.

Description

technical field

[0001] The invention belongs to the technical field of no-cleaning flux, and in particular relates to a low-temperature, halogen-free, low-solid-content modified rosin-type flux and a preparation method. Background technique

[0002] As the most important auxiliary material in soldering materials (mass fraction is 10%~20%), flux is an organic mixture with comprehensive functions, which can not only provide excellent soldering performance, but also directly affect the entire production process of the electronics industry And product quality, with the rapid development of the electronics industry and the continuous improvement of electronic precision, the requirements for flux are getting higher and higher.

[0003] A commonly used flux is a mixture of rosin as the main component. In rosin-type fluxes, in order to obtain better fluxing performance, it is generally necessary to use halogen salts of organic amines as activators. Both the human body and the envir...

Examples

Embodiment 1

[0020] A low-temperature, halogen-free, low-solid content modified rosin flux, which is prepared from modified rosin, organic acid activator, glycerin, benzotriazole, triethanolamine, surfactant and organic solvent, Among them, modified rosin accounts for 10-15% of the total mass of raw materials, organic acid activator accounts for 1-5%, glycerin accounts for 0.35-1%, benzotriazole accounts for 0.009-1%, triethanolamine accounts for 0.3-1%, Surfactant content is 0.5 ~ 3% of organic acid activator quality; Surplus is organic solvent; Described modified rosin is made up of water-white rosin and hydrogenated rosin with mass ratio of 11: (3 ~ 8), organic acid activation The surfactant is composed of glutaric acid, succinic acid and adipic acid with a mass ratio of 1:(0.4~2):(0.4~2); the surfactant is composed of Span 80 with a mass ratio of 1:(0.5~2). and Tween 60; the organic solvent is composed of absolute ethanol and isopropanol with a volume ratio of (57~68):50.

[0021] In ...

Embodiment 2

[0040] A low-temperature, halogen-free, low-solid-content modified rosin-type flux, add 9 g of water-white rosin and 6 g of hydrogenated rosin to a mixture of 62.5 mL of absolute ethanol and 50 mL of isopropanol, and stir to mix the raw materials After uniformity, raise the temperature to 70 °C, add 1 g of organic acid activator glutaric acid, 0.5 g of succinic acid, and 1 g of adipic acid to the above solution in sequence, and then add 0.03 g of nonionic surfactant Span 80 and 0.03 g non-ionic surfactant Tween 60, finally, add 0.4 mL wetting agent glycerin and 0.01 g benzotriazole corrosion inhibitor, use 0.3 mL triethanolamine to adjust the pH value of the mixture to 6.5, at a temperature of Stirring at 70 °C for 2.5 h, and after natural cooling, an orange-yellow viscous liquid was obtained.

[0041] The welding flux welding photo that this embodiment obtains is as in the accompanying drawing of description figure 1 shown.

Embodiment 3

[0043] A low-temperature, halogen-free, low-solid-content modified rosin-type flux. Add 7.5 g of water-white rosin and 7.5 g of hydrogenated rosin to a mixture of 62.5 mL of absolute ethanol and 50 mL of isopropanol, and stir to mix the raw materials After uniformity, raise the temperature to 65°C, add 1 g of organic acid activator glutaric acid, 0.5 g of succinic acid, and 1 g of adipic acid to the above solution in sequence, and then add 0.01 g of nonionic surfactant Span 80 and 0.01 g nonionic surfactant Tween 60, finally, add 0.3 mL wetting agent glycerin and 0.01 g benzotriazole corrosion inhibitor, use 0.5 mL triethanolamine to adjust the pH value of the mixture to 6.8, at a temperature of Stirring at 65 °C for 2.5 h, the orange-yellow viscous liquid was obtained after natural cooling.

[0044] The welding flux welding photo that this embodiment obtains is as in the accompanying drawing of description figure 2 shown.

technical field

[0001] The invention belongs to the technical field of no-cleaning flux, and in particular relates to a low-temperature, halogen-free, low-solid-content modified rosin-type flux and a preparation method. Background technique

[0002] As the most important auxiliary material in soldering materials (mass fraction is 10%~20%), flux is an organic mixture with comprehensive functions, which can not only provide excellent soldering performance, but also directly affect the entire production process of the electronics industry And product quality, with the rapid development of the electronics industry and the continuous improvement of electronic precision, the requirements for flux are getting higher and higher.

[0003] A commonly used flux is a mixture of rosin as the main component. In rosin-type fluxes, in order to obtain better fluxing performance, it is generally necessary to use halogen salts of organic amines as activators. Both the human body and the envir...

Examples

Embodiment 1

[0020] A low-temperature, halogen-free, low-solid content modified rosin flux, which is prepared from modified rosin, organic acid activator, glycerin, benzotriazole, triethanolamine, surfactant and organic solvent, Among them, modified rosin accounts for 10-15% of the total mass of raw materials, organic acid activator accounts for 1-5%, glycerin accounts for 0.35-1%, benzotriazole accounts for 0.009-1%, triethanolamine accounts for 0.3-1%, Surfactant content is 0.5 ~ 3% of organic acid activator quality; Surplus is organic solvent; Described modified rosin is made up of water-white rosin and hydrogenated rosin with mass ratio of 11: (3 ~ 8), organic acid activation The surfactant is composed of glutaric acid, succinic acid and adipic acid with a mass ratio of 1:(0.4~2):(0.4~2); the surfactant is composed of Span 80 with a mass ratio of 1:(0.5~2). and Tween 60; the organic solvent is composed of absolute ethanol and isopropanol with a volume ratio of (57~68):50.

[0021] In ...

Embodiment 2

[0040] A low-temperature, halogen-free, low-solid-content modified rosin-type flux, add 9 g of water-white rosin and 6 g of hydrogenated rosin to a mixture of 62.5 mL of absolute ethanol and 50 mL of isopropanol, and stir to mix the raw materials After uniformity, raise the temperature to 70 °C, add 1 g of organic acid activator glutaric acid, 0.5 g of succinic acid, and 1 g of adipic acid to the above solution in sequence, and then add 0.03 g of nonionic surfactant Span 80 and 0.03 g non-ionic surfactant Tween 60, finally, add 0.4 mL wetting agent glycerin and 0.01 g benzotriazole corrosion inhibitor, use 0.3 mL triethanolamine to adjust the pH value of the mixture to 6.5, at a temperature of Stirring at 70 °C for 2.5 h, and after natural cooling, an orange-yellow viscous liquid was obtained.

[0041] The welding flux welding photo that this embodiment obtains is as in the accompanying drawing of description figure 1 shown.

Embodiment 3

[0043] A low-temperature, halogen-free, low-solid-content modified rosin-type flux. Add 7.5 g of water-white rosin and 7.5 g of hydrogenated rosin to a mixture of 62.5 mL of absolute ethanol and 50 mL of isopropanol, and stir to mix the raw materials After uniformity, raise the temperature to 65°C, add 1 g of organic acid activator glutaric acid, 0.5 g of succinic acid, and 1 g of adipic acid to the above solution in sequence, and then add 0.01 g of nonionic surfactant Span 80 and 0.01 g nonionic surfactant Tween 60, finally, add 0.3 mL wetting agent glycerin and 0.01 g benzotriazole corrosion inhibitor, use 0.5 mL triethanolamine to adjust the pH value of the mixture to 6.8, at a temperature of Stirring at 65 °C for 2.5 h, the orange-yellow viscous liquid was obtained after natural cooling.

[0044] The welding flux welding photo that this embodiment obtains is as in the accompanying drawing of description figure 2 shown.

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