A kind of water-based flux and preparation method thereof

A flux, water-based technology, used in welding equipment, manufacturing tools, welding media, etc., can solve the problem that the insulation and flux performance of the solder resist cannot meet the requirements, and the flammability of organic solvents increases the product danger and product stability. Influence and other problems, to achieve the effect of improving spreadability, less surface residue, and no need for cleaning

Active Publication Date: 2022-07-01
NANXIONG JINHONGTAI CHEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Halogen-containing and organic solvent-containing fluxes seriously damage the atmosphere and form photochemical smog, which has a serious impact on the human body; the flammability of organic solvents also increases the danger of products; and traditional halogen-containing and rosin-containing fluxes It has a certain corrosion effect on the equipment, and there will be moisture absorption, which will affect the stability of the product and cause failures such as short circuit and open circuit.
With the continuous development and application of lightweight, miniaturized, foldable, high-performance, and high-density electronic products, higher requirements are placed on soldering fluxes. The current solder resists are still unable to achieve insulation and fluxing properties. Require

Method used

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  • A kind of water-based flux and preparation method thereof
  • A kind of water-based flux and preparation method thereof
  • A kind of water-based flux and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the glass dispersion bottle, add 300g of deionized water, add 27.0g of dipropylene glycol dimethyl ether as a co-solvent under stirring, add 10.0g of maleic anhydride and 8.0g of glycolic acid in sequence, and keep the temperature of the glass dispersion bottle: 30 ℃, stir for 20min, then add 1.2g benzotriazole, 1.5g PE6100 (BASF, Germany), 1.0g AEO-9 surfactant, 0.3g BYK019 defoamer in sequence, stirring speed: 1500 rpm / min, stirring: 30min, wait for each group After all the components are dissolved, stop stirring, filter and pack.

[0031] Environmentally friendly halogen-free water-based flux made above: expansion rate: 74%, insulation resistance value (Ω): 2.6X10 9 , pH (5% Sol) (pH value when the concentration of the solution is 5%): 7.1, the surface is clean, the compatibility is good, the mold growth grade is zero (grade 0: no mold growth in the material; grade 1: scattered, rare Or very limited mold growth; Grade 2: The mold spreads intermittently on the sur...

Embodiment 2

[0033] In a glass dispersion bottle, add 200g of deionized water, add 25.0g of dipropylene glycol dimethyl ether as a co-solvent under stirring, add 5.0g of suberic acid diethanolamide and 4.0g of glycolic acid in sequence, and keep the temperature of the glass dispersion bottle: 30°C, stir for 20min, then add 1.0g benzotriazole, 1.0g PE6100 (BASF, Germany), 1.0g AEO-9 surfactant, 0.2g BYK019 defoamer in sequence, stirring speed: 1500 rpm / min, stirring: 30min, wait for each After all the components are dissolved, stop stirring, filter and pack.

[0034] Environmentally friendly halogen-free water-based flux made above: expansion rate: 76%, insulation resistance value (Ω): 3.5X10 9 , pH (5%Sol): 7.0, the surface is clean, the compatibility is good, and the mold growth grade is zero.

Embodiment 3

[0036] In a glass dispersion bottle, add 200 g of deionized water, add 25.0 g of dipropylene glycol dimethyl ether as a co-solvent under stirring, and add 3.0 g of suberic acid diethanolamide, 2 g of itaconic acid and 4.0 g of glycolic acid in turn, keep Glass dispersing bottle temperature: 35℃, stirring for 18min, then adding 1.0g benzotriazole, 1.0g PE6100 (BASF, Germany), 1.0g AEO-9 surfactant, 0.2g BYK019 defoamer in sequence, stirring speed: 1200 rpm, stirring : 25min, after all components are dissolved, stop stirring, filter and pack.

[0037] Environmentally friendly halogen-free water-based flux made above: expansion rate: 75%, insulation resistance value (Ω): 3.5X10 9 , pH (5%Sol): 6.9, the surface is clean, the compatibility is good, and the mold growth grade is zero.

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Abstract

The invention belongs to the technical field of solder, and discloses a water-based flux and a preparation method thereof. The water-based flux comprises the following components: an organic acid activator, a surfactant, a buffer, a cosolvent, and a defoaming agent. and water; the surfactants include EO / PO block copolymers and polyoxyethylene ethers. The invention adopts EO / PO block copolymer and polyoxyethylene ether compound as surfactant, which improves the wettability and spreadability of lead-free solder, and can effectively prevent the re-oxidation of the surface during soldering; meanwhile, it has strong cleaning ability. ; Use water as the main solvent, which is environmentally safe, non-toxic, low VOC, not easy to burn, and does not need to be cleaned; the water-based flux has high insulation resistance, non-corrosiveness, strong bacteriostatic properties, and a mildew growth grade of zero. The preparation method has simple operation and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of solder, and particularly relates to a water-based flux and a preparation method thereof. Background technique [0002] Flux can help and promote the welding process in the welding process. The main function of the flux is to remove the oxides on the surface of the solder and the base metal to be welded, so that the metal surface can achieve the necessary cleanliness, and prevent the surface from re-oxidation during welding. Reducing the surface tension of the solder directly affects the entire production process and product quality of the circuit board. [0003] Fluxes containing halogens and a large amount of organic solvents seriously damage the atmosphere, form photochemical smog, and have a serious impact on the human body; the flammability of organic solvents also increases the risk of products; and traditional halogen-containing and rosin-containing fluxes It will have a certain corrosive effect on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/36B23K35/40
CPCB23K35/3613B23K35/40
Inventor 周小阳戴永红周仁杰史红涛
Owner NANXIONG JINHONGTAI CHEM NEW MATERIAL
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