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Halogen-free soldering flux for high-activity tin wire and preparation method thereof

A flux, halogen-free technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of ineffective volatilization, reduced surface insulation resistance, blackening of solder joint residues, etc., to achieve a clear and transparent appearance, The effect of improved welding activity and high insulation resistance

Active Publication Date: 2016-05-25
昆山成利焊锡制造有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

The main activators of the flux used in lead-free tin wire are organic halides (dimethylamine hydrochloride, cyclohexylamine hydrochloride, etc.), but due to their strong corrosiveness, the residues of solder joints turn black, and the salts in soldering After completion, it cannot be effectively volatilized and remains in the rosin, resulting in a decrease in surface insulation resistance and the risk of corrosion and short circuit

Method used

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  • Halogen-free soldering flux for high-activity tin wire and preparation method thereof
  • Halogen-free soldering flux for high-activity tin wire and preparation method thereof
  • Halogen-free soldering flux for high-activity tin wire and preparation method thereof

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Embodiment Construction

[0016] The present invention will be described in detail below in conjunction with specific embodiments. Specific embodiments are prepared by the following steps with reference to the formula dosage described in Table 1.

[0017] A preparation method of halogen-free flux for highly active tin wire, the method comprising the steps of:

[0018] (1) Add the refined hydrogenated rosin in the formula dosage into the reaction kettle, heat and stir until it melts completely, then raise the temperature in the reaction kettle to 130-150°C, and then add the necessary and non-essential low boiling point solvents and the necessary type in the recipe dosage Mix with optional surfactant and Tween-80 for 15-30 minutes to obtain a premix;

[0019] (2) After adding the formula dosage of vanillin and resin softener to the pre-mixture obtained in step (1), stir for 15-30 minutes and mix evenly to obtain a halogen-free flux for highly active tin wire.

[0020] Table 1 specific embodiment

[00...

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Abstract

The invention discloses a halogen-free soldering flux for a high-activity tin wire. According to the soldering flux, refined hydrogenated rosin serving as a carrier is mixed with specific low-boiling-point solvent diethylene glycol dimethyl ether, surfactant cis-4-cyclohexene-1,2-dioctyl phthalate and nonionic surfactant twin-80. According to the halogen-free soldering flux, the soldering activity is greatly improved, metal oxide film can be effectively removed, and the soldering wettability can be improved; the soldering pad is prevented from being oxidized once again by adding the antioxidant vanilline, elements and parts are not corroded after soldering, the insulation resistance is high, and residues are prevented from turning black; residues are firm after the resin softener acetic acid,2-ethylhexyl ester and / or maleic acid di-n-butyl ester is added, and the appearance is bright and transparent. The halogen-free soldering flux can meet the requirement of automatic soldering and lead-free halogen-free soldering flux for solar energy.

Description

technical field [0001] The invention relates to a flux for tin wire, in particular to a halogen-free flux for highly active tin wire and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of the electronics industry, the lead-free tin wire for automatic soldering and solar energy requires fast soldering speed and halogen-free environmental protection. The main activators of the flux used in lead-free tin wire are organic halides (dimethylamine hydrochloride, cyclohexylamine hydrochloride, etc.), but due to their strong corrosiveness, the residues of solder joints turn black, and the salts in soldering After completion, it cannot be effectively volatilized and remains in the rosin, resulting in a decrease in surface insulation resistance and the risk of corrosion and short circuit. Therefore, the requirements for flux are more stringent. Contents of the invention [0003] In order to overcome the deficiencies in the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/363
CPCB23K35/3612B23K35/362
Inventor 何繁丽苏传猛苏明斌苏传港苏燕旋晏和刚
Owner 昆山成利焊锡制造有限公司
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