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A kind of flux and preparation method thereof

A technology of flux and flux, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of low corrosion, uninhibited, high surface insulation resistance, and achieve low corrosion, high safety, and high surface insulation. The effect of resistance

Active Publication Date: 2021-10-29
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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  • A kind of flux and preparation method thereof
  • A kind of flux and preparation method thereof
  • A kind of flux and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of Polyaniline - Polystyrene Sulfonate Composites

[0034] The polystyrene sodium sulfonate is dissolved in water, and the addition of dilute hydrochloric acid is added to stir, rapidly drying, and concentrated hydrochloric acid is added again, filtrate, and the filtrate is dried 60 ° C to give a solid powder of the polystyrene sulfonate. Solid powder; Sodium polystyrene sulfonate: dilute hydrochloric acid: The weight ratio of concentrated hydrochloric acid is 1: 0.01: 0.01; at 15 ° C, the solid powder of the polystyrene sulfonate template solid powder is dissolved in water, add an aniline monomer, poly The molar ratio of sodium styrene sulfonate and aniline is 10: 7, the pH is adjusted to 3, rapidly stirred for 10 h, slowly dropped with ammonium sulfate solution, ammonium sulfate and aniline molar ratio of 4:10, After the addition of the reaction of 10 h, filtration was dried in 2 hours, and the filtrate was dried after removal of unreacted monomers a...

Embodiment 2

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

[0036] The polystyrene sodium sulfonate is dissolved in water, and the addition of dilute hydrochloric acid is added to stir, rapidly drying, and concentrated hydrochloric acid is added again, filtrate, and the filtrate is dried 60 ° C to give a solid powder of the polystyrene sulfonate. Solid powder; The sodium polystyrene sulfonate: dilute hydrochloric acid: the weight ratio of concentrated hydrochloric acid is 1: 0.005: 0.01; at 10 ° C, the sodium polystyrene sulfonate template solid powder is dissolved in water, add an aniline monomer, polymer The molar ratio of sodium styrene sulfonate and aniline is 10: 7, and the pH is adjusted to 4 with dilute hydrochloric acid to stir. After the addition of 2 hours, it was continued for 8 h, filtrate the insoluble material of the unreacted monomer and aniline oligomer, was dried, and the powder was dried, and the powder was cleaned with ethanol, dried in ...

Embodiment 3

[0037] Example 3 Preparation of flux

[0038] A flux including the following mass percentage of components: 1.5% hydrogenated roster glycerides, 1.5% acrylate glycerides, DWF-6240 5%, polyaniline-polystyrene sulfonate complex 4%, 1- Ethyl-3-methylimidazole tetrafluororate 8%, dodecyl dimethyl oxide 1%, amide-modified hydrogenated castor oil 7%, diethylene glycol butyl ether 5%, ethylene glycol 5%, the margin is water.

[0039] Preparation steps:

[0040] S1: Pattern, acrylate, and diethylene glycol butyl ether, ethylene glycol, heated to 110 ° C, stir until the rosin is completely dissolved, and the solution A is obtained.

[0041] S2: Sodium DWF-6240, polyaniline-polystyrene sulfonate, 1-ethyl-3-methylimidazoliolirate, dodecyl dimethyl oxide, amide modified hydrogenation Castor oil is dissolved in water, heated to 55 ° C, stir until the material is completely dissolved, and the solution B is obtained.

[0042] S3: The solution A and solution B were mixed, stirred well, cooled to r...

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Abstract

The invention discloses a flux and a preparation method thereof. The flux includes the following components in terms of mass percentage: rosin ester 2-5%, polybranched alcohol modified surfactant 3-5%, polyaniline-polystyrene sodium sulfonate compound 4-8% , 5-10% of 1-ethyl-3-methylimidazolium tetrafluoroborate, 0.5-1.5% of activity enhancer, 3-10% of thixotropic agent, 10-15% of co-solvent, and the balance is water. 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.

Description

Technical field [0001] The present invention relates to the technical field of electronic packaging welding materials, and more particularly to a flux and a preparation method thereof. Background technique [0002] With the continuous development of the electronics industry, the continuous upgrade of electronic products and continuous upgrades of environmental protection regulations, the market's requirements for flux are also increasing. High-efficiency flux as a key connection material in the SMT (surface mounting technology) industry, with the continuous development of the SMT industry, demand will continue to increase. China as one of the world's important SMT equipment manufacturing bases will grow year by year. With the enhancement of human environmental awareness and the implementation of lead-free products and frerenza policy, lead-free brazing technology and exemption tolerable fluxing with them are used to become a hot spot in domestic and foreign research. However, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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