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Soldering flux and preparation method thereof

A flux and co-solvent technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of low corrosiveness, uninhibited, high surface insulation resistance, and achieve low corrosiveness, oxidation prevention, and high wetting rate. Effect

Active Publication Date: 2019-10-15
浙江强力控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux overcomes the defect that the existing water-based no-cleaning flux cannot inhibit the formation of solder bridges, and has the characteristics of high soldering activity, strong solderability, less residue, and high surface insulation resistance. Low corrosion, good storage stability, good applicability to lead-free soldering, meet the requirements of no-cleaning

Method used

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  • Soldering flux and preparation method thereof
  • Soldering flux and preparation method thereof
  • Soldering flux and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of polyaniline-sodium polystyrene sulfonate complex

[0034] Dissolve sodium polystyrene sulfonate in water, add dilute hydrochloric acid under stirring to acidify, quickly spin-dry, add concentrated hydrochloric acid to dissolve again, suction filtration, the filtrate is spin-dried and vacuum-dried at 60°C to obtain sodium polystyrene sulfonate template solid powder; The weight ratio of said sodium polystyrene sulfonate: dilute hydrochloric acid: concentrated hydrochloric acid is 1:0.01:0.01; at 15°C, the solid powder of polystyrene sulfonate template is dissolved in water, and aniline monomer is added to polymerize The molar ratio of sodium styrene sulfonate and aniline is 10:7. Adjust the pH to 3 with dilute hydrochloric acid. After stirring quickly for 10 hours, slowly add ammonium persulfate solution. The molar ratio of ammonium persulfate to aniline is 4:10. After dripping in 2h, continue the reaction for 10h, filter to remove unreacted monomer ...

Embodiment 2

[0035] Example 2 Preparation of polyaniline-sodium polystyrene sulfonate complex

[0036] Dissolve sodium polystyrene sulfonate in water, add dilute hydrochloric acid under stirring to acidify, quickly spin-dry, add concentrated hydrochloric acid to dissolve again, suction filtration, the filtrate is spin-dried and vacuum-dried at 60°C to obtain sodium polystyrene sulfonate template solid powder; The weight ratio of said sodium polystyrene sulfonate: dilute hydrochloric acid: concentrated hydrochloric acid is 1:0.005:0.01; at 10°C, the solid powder of polystyrene sulfonate template is dissolved in water, and aniline monomer is added to polymerize The molar ratio of sodium styrene sulfonate and aniline is 10:7, adjust the pH value to 4 with dilute hydrochloric acid, stir quickly for 12h, slowly add ammonium persulfate solution, the molar ratio of ammonium persulfate to aniline is 4:10, After dripping in 2h, continue the reaction for 8h, filter to remove unreacted monomers and inso...

Embodiment 3

[0037] Example 3 Preparation of flux

[0038] A flux comprising the following components in mass percentage: 1.5% hydrogenated rosin glyceride, 1.5% glyceryl rosin acrylate, DWF-6240 5%, polyaniline-sodium polystyrene sulfonate complex 4%, 1- Ethyl-3-methylimidazole tetrafluoroborate 8%, dodecyl dimethyl amine oxide 1%, amide modified hydrogenated castor oil 7%, diethylene glycol butyl ether 5%, ethylene glycol 5%, the balance is water.

[0039] Preparation steps:

[0040] S1: Mix hydrogenated rosin glyceride, glyceryl rosin acrylate, diethylene glycol butyl ether and ethylene glycol, heat to 110°C, and stir until the rosin ester is completely dissolved to obtain solution A;

[0041] S2: DWF-6240, polyaniline-sodium polystyrene sulfonate complex, 1-ethyl-3-methylimidazole tetrafluoroborate, dodecyldimethylamine oxide, amide modified hydrogenation Castor oil is dissolved in water, heated to 55°C, stirred until the material is completely dissolved, and solution B is obtained;

[0042] ...

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Abstract

The invention discloses a soldering flux and a preparation method thereof. The soldering flux comprises the following components of, in percentage by mass, 2%-5% of rosin ester, 3%-5% of multi-branched-chain alcohol modified surfactants, 4%-8% of polyaniline-sodium polystyrenesulfonate compounds, 5%-10% of 1-ethyl-3-methylimidazolium tetrafluoroborate, 0.5%-1.5% of active enhancers, 3%-10% of thixotropic agents, 10%-15% of cosolvents and the balance water. The soldering flux overcomes the defects that an existing water-based cleaning-free soldering flux cannot inhibit the formation of a tin bridge of a soft solder, and has the characteristics that the soldering flux is high in soldering activity, strong in solderability, less in residue, high in surface insulation resistance, low in corrosivity, good in storage stability, good in applicability to lead-free soldering and free of cleaning requirements.

Description

Technical field [0001] The invention relates to the technical field of soldering materials for electronic packaging, in particular to a flux and a preparation method thereof. Background technique [0002] With the continuous development of the electronics industry, the continuous updating of electronic products and the continuous upgrading of environmental protection regulations, the market's requirements for flux are also increasing. As the key connecting material in the SMT (Surface Mount Technology) industry, high-efficiency flux is bound to increase in demand as the SMT industry continues to develop. As one of the world's important SMT equipment manufacturing bases, my country's demand for high-efficiency flux will increase year by year. With the enhancement of human environmental protection awareness and the implementation of the ban on the use of lead-containing products and the implementation of the Freon policy, lead-free soldering technology and the no-clean flux used i...

Claims

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Application Information

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IPC IPC(8): B23K35/362B23K35/363B23K35/40
CPCB23K35/3606B23K35/362B23K35/40
Inventor 何雪连
Owner 浙江强力控股有限公司
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