Water-based flux with low volatility and low solid content and preparation method thereof

A technology with low solid content and flux, applied in welding equipment, welding medium, manufacturing tools, etc., can solve the problems of high residual solids, polluting the environment, and high volatility, and achieves a wide range of applicable processes, stable chemical properties, and low volatility. The effect of less sexual gas

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. The purpose of the present invention is to provide a low-volatility and low-solid-content water-based flux and a preparation method; organic substances such as alcohols and ketones are not used as solvent carriers; Disadvantages such as high residue, high cost, high volatility, flammable and explosive, polluting the environment, etc.

Method used

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preparation example Construction

[0039] A preparation method of low-volatility and low-solid-content 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 aforementioned second and third steps, use heating equipment to heat, so that the temperature is kept in the range of 30°C to 60°C.

[0044] The active agent of the present invention, its selectable specific mass percentage is: 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%,...

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 lactic acid, lactic acid: DL-malic acid=1:1, the mass ratio is 1.5%, and the surfactant NP-9 is mixed with AEC-9NA, which is 1.5 %, NP-9:AEC-9NA=1:1, the corrosion inhibitor is hydroxypropyl chitosan 0.01%, the antioxidant is hydroquinone 0.3%, and the film-forming agent is triethanolamine, 0.1%. The balance is solvent, and the solvent is deionized water. 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

[0048] 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 2.5%, DL-malic acid: adipic acid=4:1, the surfactant Surfynol465 is mixed with AEC-9NA, 3%, Surfynol465: AEC-9NA=1:2, film-forming agent is triethanolamine 0.15%, corrosion inhibitor is hydroxypropyl chitosan 0.2%, antioxidant hydroquinone 0.5%, additive polyethylene glycol Alcohol 400 is 0.2%, the balance is solvent, and the solvent is deionized water.

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Abstract

The invention provides a water-based flux with low volatility and low solid content and a preparation method thereof, wherein the components and the mass percents are as follows: 1.5 to 6 percents ofan active agent; 2.5 to 6 percents of a surfactant, 0 to 0.3 percent of a film-forming agent, 0.3 to 0.8 percent of an antioxidant, 0 to 0.8 percent of an additive, 0.01 to 0.5 percent of a corrosioninhibitor and the balance of solvent deionized water. The active agent is mixed by at least two kinds of lactic acid, acrylic acid, DL-malic acid, adipic acid and fumaric acid, and the mass ratio of each of which is greater than 0%, and the temperature is controlled at 30-60 DEG C during mixing. The surfactant is alcohol ether carboxylate, or alkylphenol polyoxyethylene, or acetylenic diol ethoxylates, or is mixed by any two of the above in a mass ratio of greater than 0% each. The film-forming agent is triethanolamine. The antioxidant is hydroquinone. The corrosion inhibitor is hydroxypropylchitosan. The water-based flux is halogen-free, rosin-free, and is low in solid content, and deionized water is used as a solvent, the cost is low, the volatile gas is little, the irritating odor is not present, the tin-frying phenomenon is not present, and the physical health is not affected, and the environment is protected.

Description

technical field [0001] The invention belongs to the chemical industry field of preparing flux for circuit welding, and relates to a low-volatility and low-solid-content 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 eco...

Claims

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Application Information

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IPC IPC(8): B23K35/36B23K35/362B23K35/40
CPCB23K35/3612B23K35/362B23K35/40
Inventor 甘贵生田谧哲刘歆蒋刘杰夏大权曹华东蒋妮杨栋华
Owner CHONGQING UNIV OF TECH
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