Low-carbon low-volatility water-based flux and preparation method thereof

A low-volatility, flux technology, used in welding equipment, welding media, manufacturing tools, etc., can solve the problems of many volatile gases, high solid residues, polluting the environment, etc., to achieve round and bright solder joints, solid residues Low, chemically stable effect

Pending Publication Date: 2019-03-29
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the above-mentioned deficiencies of the prior art, and the purpose of the present invention is to provide a low-carbon and low-volatility water-based flux and a preparation method; to solve the problem of high residual solids after soldering of existing fluxes, many volatile gases, and instability , flammable and explosive, polluting the environment and other disadvantages

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0039] A preparation method of low-carbon and low-volatility water-based flux, characterized in that: comprising the following steps:

[0040] Step 1: Prepare the components according to the ratio required by the process; add the active agent into the solvent and stir at a temperature of 30°C~60°C to dissolve the active agent;

[0041] The second step: add the surfactant to the solution obtained in the first step, stir and dissolve at a temperature of 30°C~60°C;

[0042] Step 3: Add film formers, antioxidants, corrosion inhibitors, and additives to the solution obtained in Step 2, stir and dissolve at a temperature of 30°C to 60°C, mix well, and filter to obtain the flux.

[0043] Further: in the second and third steps, use heating equipment to keep the temperature in the range of 30°C to 60°C.

[0044] Active agent of the present invention, its selectable specific mass percentage is: 2%, 2.5%, 3%, 3.5%, 4%, 4.5% etc., all can meet the needs of the present invention; Surfacta...

Embodiment 1

[0046] In this implementation, the raw materials are prepared according to the following mass ratio: the active agent is a mixture of DL-malic acid and succinic acid, succinic acid:DL-malic acid=1:1, the mass ratio is 2%, and the surfactant TX-10 phosphate is 1.5% , the corrosion inhibitor is 0.01% hydroxypropyl chitosan, the antioxidant is 0.01% hydroquinone, and the film-forming agent is triethanolamine, which is 0.12%. The balance is solvent, and the solvent is deionized water.

[0047] When preparing, add the active agent into the solvent, stir at a temperature of 30°C to 60°C to promote its full dissolution, then add the surfactant to the solution, and stir at a temperature of 30°C to 60°C until it is completely dissolved; then Add film-forming agent, corrosion inhibitor, antioxidant and additives (if any) to the aforementioned solution, stir and dissolve at a temperature of 30°C to 60°C, mix evenly and cool, then filter to obtain the flux.

Embodiment 2

[0049] In this implementation, the raw materials are prepared according to the following mass ratio: the active agent is a mixture of DL-malic acid and adipic acid, the mass ratio is 3%, DL-malic acid: adipic acid=3:2, and the surfactant AEC-9NA is 2% , the film forming agent is triethanolamine 0.15%, the corrosion inhibitor is benzotriazole 0.1%, the antioxidant hydroquinone is 0.1%, the additive polyethylene glycol 400 is 0.2%, the balance is solvent, and the solvent is deionized water.

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PUM

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Abstract

The invention provides a low-carbon low-volatility water-based flux and a preparation method thereof. The low-carbon low-volatility water-based flux is prepared from the following components, by mass:2-4.5% of an active agent, 1.5-4% of a surface active agent, 0-0.4% of a film-forming agent, 0.01-0.3% of an antioxidant, 0.01-0.4% of a corrosion inhibitor and the balance a solvent, specifically, the active agent is prepared by mixing at least two of succinic acid, benzoic acid, DL-malic acid and adipic acid at the mass ratio of greater than 0% respectively at the temperature of 30-60 DEG C; and the surface active agent is any one of AEC-9NA or TX-10 phosphate, or the surface active agent is prepared by mixing both of the AEC-9NA and TX-10 phosphate at the mass ratio of greater than 0% respectively. The flux has low solid residue content, no halogen, no rosin, low carbon, no volatile organic compound, no irritating odor, little corrosion to a circuit board, and round and bright solder joints. Besides, the flux is easy to manufacture, quite low in cost, convenient to store and transport, free of solder explosion, stable in chemical property, free of influence on physical health of operators and environmentally friendly.

Description

technical field [0001] The invention belongs to the chemical industry field of preparing flux for circuit welding, and relates to a low-carbon and low-volatility water-based flux and a preparation method thereof. Background technique [0002] Flux is an indispensable part of the welding process, and its main function is to remove oxides on the metal surface. In addition, it can also protect the welding area, reduce the surface tension of the liquid solder, improve the diffusion of the liquid solder, enhance the filling ability, and improve the heat transfer and balance of the welding area. [0003] At present, the active ingredients of some fluxes on the market contain halogens. Fluxes containing halogens can quickly remove the oxide film of the pad and enhance the wettability of the solder. However, the addition of halogens will weaken the reliability of solder joints and cause surface insulation. The reduction of resistance will also have adverse effects on the ecological...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/36B23K35/362B23K35/40
CPCB23K35/3612B23K35/362B23K35/40
Inventor 甘贵生田谧哲刘歆夏大权蒋刘杰曹华东吴应雪吴懿平
Owner CHONGQING UNIV OF TECH
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