Deflux cleaning composition

Abstract

To provide a flux cleaning composition.SOLUTION: A flux cleaning composition according to the present invention comprises, based on the total weight of the flux cleaning composition being 100%, includes: 2% to 20% of an amphoteric surfactant; 0.1% to 2% of a reducing agent; 5% to 10% of a chelating agent; 70% to 90% of an organic solvent; and 2.5% to 20% of water.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a cleaning composition, and in particular to a flux cleaning composition. [Background technology]

[0002] The assembly of electronic components usually requires soldering, and at high temperatures, an oxide film is likely to form on the metal surface of the solder joint, making it difficult for solder materials (such as tin) to adhere to the metal surface. Therefore, in the soldering process, flux is used to chemically remove the oxide layer on the surface of the soldered metal, preventing re-oxidation of the surface during soldering and favoring the progress of the soldering by the tin. However, solder and flux residues remain in the gaps of the printed circuit board, making cleaning difficult.

[0003] Because flux typically contains rosin as its primary component, conventional techniques use halogenated hydrocarbons such as fluorocarbons to clean rosin-based flux. However, halogenated hydrocarbons are highly toxic and carcinogenic to humans. Furthermore, volatile halogenated hydrocarbons not only deplete the ozone layer, but can also be distributed and circulated in the air, water, and soil through precipitation and surface currents, causing significant environmental damage.

[0004] Therefore, it is an important task for this industry to overcome the above-mentioned drawbacks by developing a defluxing composition that can clean effectively and is environmentally friendly through the improvement of its ingredients. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem that the present invention aims to solve is to provide a defluxing composition that addresses the shortcomings of the prior art. [Means for solving the problem]

[0006] The defluxing composition contains, based on the total weight of the defluxing composition being 100%, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof 2% to 20% of a solvent, 0.1% to 2% of a reducing agent, 5% to 10% of a chelating agent, 70% to 90% of an organic solvent, and 2.5% to 20% of water.

[0009] In one embodiment of the invention, the reducing agent is stannous chloride, ferrous sulfate, titanium trichloride, reduced iron powder, oxalic acid, sodium thiosulfate, sodium sulfite, hypophosphorous acid, dithiothreitol, or a combination thereof.

[0010] In one embodiment of the invention, the chelating agent is ethylenediamine, 2,2'-bipyridine, 1,10-phenanthroline, oxalate, ethylenediaminetetraacetic acid, 1,2-bis(dimethylarsino)benzene, citric acid, malic acid, or a combination thereof.

[0011] In one embodiment of the invention, the organic solvent is ethylene glycol monoalkyl ether, ethylene glycol monophenyl ether, diethylene glycol monophenyl ether, diethylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, diethylene glycol dialkyl ether, or a combination thereof.

[0012] In one embodiment of the present invention, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The content is 5% to 10%.

[0013] In one embodiment of the present invention, the content of the reducing agent is 0.5% to 1%.

[0014] In one embodiment of the present invention, the content of the chelating agent is 6% to 8%.

[0015] In one embodiment of the present invention, the content of the organic solvent is 80% to 85%.

[0016] In one embodiment of the present invention, the water content is 8% to 13%.

[0017] In one embodiment of the present invention, the flash point of the organic solvent is 100°C to 110°C.

[0018] In one embodiment of the present invention, the organic solvent has a pH of 8-9.

[0019] In one embodiment of the present invention, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The weight ratio of the surfactant to the reducing agent ( Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The ratio of toluene to reducing agent is 15:1 to 20:1.

[0020] In one embodiment of the present invention, the saturation of the defluxing composition after heating at 95° C. for 168 hours is less than 15G. [Effects of the Invention]

[0021] One of the advantageous effects of the present invention is that the defluxing composition of the present invention has the following properties: Polyoxypropylene propyl ether, ethambutol, or a mixture thereof With the technical feature of "containing 2%-20% of solvent, 0.1%-2% of reducing agent, 5%-10% of chelating agent, 70%-90% of organic solvent, and 2.5%-20% of water," the company provides a halogenated hydrocarbon-free formulation that effectively cleans flux, replacing existing halogenated hydrocarbon-based cleaners. DETAILED DESCRIPTION OF THE INVENTION

[0022] In order to better understand the features and technical contents of the present invention, please refer to the following detailed description of the present invention, however, the detailed description provided is only for reference and explanation, and is not intended to limit the scope of the claims of the present invention.

[0023] Hereinafter, the implementation of the "defluxing composition" according to the present invention will be described using certain specific embodiments, and those skilled in the art will be able to understand the advantages and effects of the present invention based on the contents disclosed herein. The present invention can be implemented or applied using other different specific embodiments, and various modifications and changes can be made to the details herein based on different perspectives and applications without departing from the concept of the present invention. The technical content of the present invention will be described in more detail based on the following implementation modes, but the disclosed contents do not limit the protection scope of the present invention.

[0024] The present invention provides a defluxing composition, specifically, a defluxing composition that does not contain halogenated hydrocarbons. In order to maintain good cleaning ability even for rosin-based fluxes, the defluxing composition does not contain halogenated hydrocarbons. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof By using provide.

[0026] In one embodiment, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof is 2% to 20% by weight of the total weight of the defluxing composition, i.e., 2% to 20% and any positive number therebetween, for example, 2%, 2.5%, 3%, 4%, 5%, 5.5%, 6%, 7%, 8%, 9%, 10%, 10.5%, 11%, 12%, 13%, 14%, 15%, 15.5%, 16%, 17%, 18%, 19%, or 20%. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof If the content is less than 2%, the cleaning effect of the deflux composition on rosin-based flux will be poor, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof If the content of exceeds 20%, excessive foaming occurs when the defluxing composition is used. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The content may be 5% to 10%.

[0027] However, the above Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The color may deepen after being heated. Polyoxypropylene propyl ether, ethambutol, or a mixture thereofIn order to avoid the color of the defluxing composition from deepening and affecting its use, the defluxing composition of the present invention may further contain a reducing agent to prevent oxidation of the surfactant and stabilize the components of the defluxing composition. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof It is an antioxidant.

[0028] For example, the reducing agent may be stannous chloride, ferrous sulfate, titanium trichloride, reduced iron powder, oxalic acid, sodium thiosulfate, sodium sulfite, hypophosphorous acid, dithiothreitol, or a combination thereof. However, the above example is merely one possible embodiment, and the present invention is not limited thereto. In a preferred embodiment of the present invention, the reducing agent may be stannous chloride or sodium sulfite.

[0029] In one embodiment, the content of the reducing agent is 0.1% to 2% of the total weight of the defluxing composition, i.e., 0.1% to 2% and any integer therebetween, such as 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, or 2%. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The maximum antioxidant effect of the present invention is poor, and a content of reducing agent exceeding 2% will result in an unnecessary increase in process costs for the defluxing composition of the present invention. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The content of may be 0.5% to 1%. It is worth noting that the reducing agent is effectively used to obtain the best results. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof To achieve the antioxidant effect of Polyoxypropylene propyl ether, ethambutol, or a mixture thereof and the reducing agent in a weight ratio of 15:1 to 20:1, for example, 15:1, 16:1, 17:1, 18:1, 19:1, or 20:1.

[0030] Furthermore, when cleaning printed circuit boards, metal ions are easily dissolved, affecting the performance of the defluxing composition. Therefore, the present invention may include a chelating agent capable of forming a coordinate or chelate with a metal or metal oxide so as to maintain the cleaning ability of the defluxing composition. In one embodiment, the content of the chelating agent is 5% to 10% of the total weight of the defluxing composition, i.e., 5% to 10% and any positive integer therebetween, such as 5%, 6%, 7%, 8%, 9%, or 10%. If the content of the chelating agent is less than 5%, the resulting cleaning composition will not overcome the problem of being affected by metal ions, while if the content of the chelating agent is more than 10%, it will be uneconomical. In a preferred embodiment, the content of the chelating agent is 6% to 8%.

[0031] For example, the chelating agent may be ethylenediamine, 2,2'-bipyridine, 1,10-phenanthroline, oxalate, ethylenediaminetetraacetic acid (EDTA), 1,2-bis(dimethylarsino)benzene, citric acid, malic acid, or a combination thereof. However, the above-mentioned examples are merely possible embodiments, and the present invention is not limited thereto. In a preferred embodiment of the present invention, the chelating agent may be citric acid or malic acid, which have good stability in the defluxing composition of the present invention.

[0032] The defluxing composition of the present invention uses an organic solvent. Polyoxypropylene propyl ether, ethambutol, or a mixture thereofThe organic solvent may be a fluorine-containing solvent, a reducing agent, and a chelating agent, which may be uniformly mixed. For example, the organic solvent may be ethylene glycol monoalkyl ether, ethylene glycol monophenyl ether, diethylene glycol monophenyl ether, diethylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, diethylene glycol dialkyl ether, or a combination thereof. However, the above example is merely one possible embodiment, and the present invention is not limited thereto. In order to maintain the stability of the defluxing composition and avoid crystal precipitation, in a preferred embodiment of the present invention, the organic solvent may be an ethylene glycol monoalkyl ether.

[0033] In one embodiment, the content of the organic solvent may be 70% to 90% of the total weight of the defluxing composition, i.e., 70% to 90% and any integer between these, such as 70%, 75%, 80%, 85%, or 90%. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof If the organic solvent content exceeds 90%, the concentration of the effective cleaning ingredients in the defluxing composition will be too low, which will affect the cleaning effect of the defluxing composition. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The content may be 80% to 85%.

[0034] In order for the defluxing composition of the present invention to be suitable for use in an environment with an operating temperature of about 75° C., it is preferable to select an organic solvent with a flash point of 100° C. to 110° C., and it is more preferable to select an organic solvent with a flash point of 105° C. At the same time, in order to prevent the defluxing composition from causing corrosiveness to circuit boards at the operating temperature, the pH of the organic solvent may be 8 to 9 or any positive number therebetween.

[0035] In the defluxing composition of the present invention, the total weight of the defluxing composition is taken as 100%, Polyoxypropylene propyl ether, ethambutol, or a mixture thereofThe remaining components other than the reducing agent, the chelating agent, and the organic solvent may be water. In other words, the water content may be 2.5% to 20% of the total weight of the defluxing composition, i.e., 2.5% to 20% and any positive number therebetween, for example, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 10%, 15%, or 20%. Preferably, the water content is 8% to 13% of the total weight of the defluxing composition. It is particularly noteworthy that Polyoxypropylene propyl ether, ethambutol, or a mixture thereof In order to achieve the effect of uniformly mixing the organic solvent, reducing agent, and chelating agent and to obtain a stable defluxing composition, the ratio of organic solvent to water is 10 to 35 or any positive number therebetween, for example, 10, 12, 14, 17.8, 22.9, 25, 28, or 32, and is preferably 15 to 32. [Example]

[0036] The present invention will be further described below with reference to examples so that those skilled in the art can more easily understand the advantages of the defluxing composition of the present invention, but the present invention is not limited to these examples. In the examples described below, the components were mixed simultaneously or in any order. Unless otherwise specified, "% (percentage of concentration)" in this specification is always expressed as "wt% (percentage by weight)."

[0037] [Example 1] 8% polyoxypropylene propyl ether, 0.5% stannous chloride, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 4.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E1, which is Example 1 of the present application.

[0038] [Example 2] 8% polyoxypropylene propyl ether, 0.5% sodium sulfite, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 4.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E2 of Example 2 of the present invention.

[0039] [Example 3] 9% polyoxypropylene propyl ether, 0.5% hypophosphorous acid, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 3.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E3 of Example 3 of the present application.

[0040] [Example 4] 10% polyoxypropylene propyl ether, 0.5% dithiothreitol, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 2.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E4 of Example 4 of the present invention.

[0041] [Example 5] 8% ethambutol, 0.5% stannous chloride, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 4.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E5 of Example 5 of the present invention.

[0042] [Example 6] 8% ethambutol, 0.5% sodium sulfite, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 4.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E6 of Example 6 of the present invention.

[0043] [Example 7] 9% ethambutol, 0.5% hypophosphorous acid, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 3.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E7 of Example 7 of the present invention.

[0044] [Example 8] 10% ethambutol, 0.5% dithiothreitol, 7% citric acid, 80% ethylene glycol monoalkyl ether, and 2.5% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E8 of Example 8 of the present invention.

[0045] [Example 9] 15% polyoxypropylene propyl ether, 1% stannous chloride, 7% malic acid, 70% ethylene glycol monoalkyl ether, and 7% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E9 of Example 9 of the present invention.

[0046] [Example 10] 15% ethambutol, 1% sodium sulfite, 7% malic acid, 70% ethylene glycol monoalkyl ether, and 7% water were uniformly mixed and stirred, and then filtered to obtain a defluxing composition E10 of Example 10 of the present invention.

[0047] [Comparative Example] 15% polyoxypropylene propyl ether, 7% citric acid, 70% ethylene glycol monoalkyl ether, and 8% water were uniformly mixed and stirred, and the mixture was filtered to prepare Comparative Example C.

[0048] To measure and evaluate cleaning power, test circuit boards for residual rosin-based flux were immersed in the defluxing composition at 75°C, rinsed with nitrogen, and dried. After the cleaning process, the test circuit boards were observed under a microscope and visually inspected. If no residual flux was found, an "O" was recorded, and if residual flux was found, an "X" was recorded.

[0049] [Color depth measurement] The defluxing compositions were heated at 95°C for 168 hours, and the saturation was measured using a colorimeter. The lower the color depth value, the brighter the color. The component formulations and test results for each example are recorded in Table 1 below.

[0050] [Table 1]

[0051] As shown in Table 1, the defluxing composition of the present invention does not contain halogenated hydrocarbons and contains, as a main cleaning component, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof By using the above, it is possible to ensure that the cleaning power for the rosin-based flux is achieved. Polyoxypropylene propyl ether, ethambutol, or a mixture thereof By using only a reducing agent, a chelating agent, an organic solvent and water, it is possible to achieve the effect of providing a defluxing composition that has strong cleaning power, is safe and environmentally friendly, and is economically effective in the actual application of cleaning rosin-based flux.

[0052] It is noteworthy that, as shown in Comparative Example C, the fluorine-containing compound contained in the defluxing composition Polyoxypropylene propyl ether, ethambutol, or a mixture thereof In Examples E1 to E10 of the present invention, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof A specific content of reducing agent is added relative to the content of stannous chloride, and the problem of the deflux composition becoming darker after heating can be improved compared to Comparative Example C. Here, Example 5 uses a combination of ethambutol and stannous chloride, and is most effective in improving the problem of the deflux composition becoming darker after heating.

[0053] [Advantageous Effects of the Embodiments] One of the advantageous effects of the present invention is that the defluxing composition of the present invention has the following properties: Polyoxypropylene propyl ether, ethambutol, or a mixture thereof With the technical feature of "containing 2%-20% of solvent, 0.1%-2% of reducing agent, 5%-10% of chelating agent, 70%-90% of organic solvent, and 2.5%-20% of water," the company provides a halogenated hydrocarbon-free formulation that effectively cleans flux, replacing existing halogenated hydrocarbon-based cleaners.

[0054] Furthermore, adding a reducing agent has the following advantages: Polyoxypropylene propyl ether, ethambutol, or a mixture thereofTherefore, in order to use a reducing agent economically, the deflux composition of the present invention contains Polyoxypropylene propyl ether, ethambutol, or a mixture thereof The weight ratio of the reducing agent to the catalyst is 15:1 to 20:1.

[0055] The flux cleaning composition of the present invention comprises: Polyoxypropylene propyl ether, ethambutol, or a mixture thereof , a reducing agent, and a chelating agent are simultaneously contained, Polyoxypropylene propyl ether, ethambutol, or a mixture thereof In order to achieve optimal effects by uniformly mixing the reducing agent and the chelating agent, the ratio of the organic solvent to water is controlled to 10 to 35. Preferably, the ratio of the organic solvent to water is 15 to 32.

[0056] The above disclosure is merely a preferred embodiment of the present invention, and the scope of the claims of the present invention is not limited thereto. Therefore, all equivalent technical modifications made using the specification and drawings of the present invention are included in the scope of the claims of the present invention.

Claims

1. The total weight of the defluxing composition is taken as 100%, 2% to 20% of polyoxypropylene propyl ether, ethambutol, or a mixture thereof; Reducing agent 0.1% to 2% 5% to 10% chelating agent, 70% to 90% organic solvent, and 2.5% to 20% water.

2. 2. The defluxing composition according to claim 1, wherein the reducing agent is stannous chloride, ferrous sulfate, titanium trichloride, reduced iron powder, oxalic acid, sodium thiosulfate, sodium sulfite, hypophosphorous acid, dithiothreitol, or a combination thereof.

3. 2. The flux cleaning composition according to claim 1, wherein the chelating agent is ethylenediamine, 2,2′-bipyridine, 1,10-phenanthroline, oxalate, ethylenediaminetetraacetic acid, 1,2-bis(dimethylarsino)benzene, citric acid, malic acid, or a combination thereof.

4. 2. The defluxing composition according to claim 1, wherein the organic solvent is ethylene glycol monoalkyl ether, ethylene glycol monophenyl ether, diethylene glycol monophenyl ether, diethylene glycol monoalkyl ether, dipropylene glycol monoalkyl ether, diethylene glycol dialkyl ether, or a combination thereof.

5. 2. The defluxing composition according to claim 1, wherein the content of the polyoxypropylene propyl ether, ethambutol, or a mixture thereof is 5% to 10%.

6. 2. The deflux composition according to claim 1, wherein the content of the reducing agent is 0.5% to 1%.

7. 2. The flux cleaning composition according to claim 1, wherein the content of the chelating agent is 6% to 8%.

8. 2. The defluxing composition according to claim 1, wherein the organic solvent content is 80% to 85%.

9. 2. The flux removing composition according to claim 1, wherein the water content is 8% to 13%.

10. 2. The defluxing composition according to claim 1, wherein the organic solvent has a flash point of 100°C to 110°C.

11. 2. The defluxing composition according to claim 1, wherein the organic solvent has a pH of 8 to 9.

12. 2. The defluxing composition according to claim 1, wherein a weight ratio of the polyoxypropylene propyl ether, ethambutol, or a mixture thereof to the reducing agent (polyoxypropylene propyl ether, ethambutol, or a mixture thereof:reducing agent) is 15:1 to 20:

1.

13. 2. The flux cleaning composition according to claim 1, wherein the saturation of the flux cleaning composition after heating at 95°C for 168 hours is less than 15G.

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