KR20220150654A - Metal cleaner and method for cleaning metal - Google Patents

Abstract

The present invention relates to a metal cleaner containing a purified corrosion inhibitor and an ester-based compound, and a method for cleaning metal using the same. More specifically, the present invention relates to a non-aqueous metal cleaner which has improved corrosion resistance to metal and improved cleaning power by applying refining technology. The ester-based compound includes C1 to C10 alkyl acetate, C1 to C10 alkyl butyrate, C1 to C10 alkyl lactate, C1 to C10 alkyl hexanoate, or a combination thereof.

Description

Metal cleaner and metal cleaning method {METAL CLEANER AND METHOD FOR CLEANING METAL}

It relates to a metal cleaner and a method for cleaning metal.

In modern industrial society, the use of metal cleaners is essential, but there is a problem of containing toxic substances, and the development of eco-friendly, low-toxic cleaners is required. Various metals such as stainless steel (SUS), aluminum and aluminum alloys, nickel and nickel alloys, copper and copper alloys, and brass alloys are widely used in our lives, from small electronic device parts to automobile parts, large ships and aircraft. Processing oil such as punching oil, anti-rust oil, and cutting oil is used for the metal surface, and such processing oil facilitates metal processing and improves fairness by preventing corrosion and friction during processing.

TCE (trichloroethylene), MC (dichloromethane), NPBr (1-bromopropane), PCE (tetrachloroethylene), etc., which are components contained in commercially available detergents, are carcinogenic and toxic substances, restricted substances and air pollution. classified as substances. In addition, some organic solvent components in detergents have a high risk of fire during work due to their low flash points, cause occupational diseases of workers due to their odor, and have disadvantages in that additional investment in environmental safety and disaster prevention facilities is required. Therefore, in order to develop an eco-friendly cleaner that has excellent cleaning power and secures work safety, existing toxic substances are being replaced with low-toxic cleaners.

The most important thing in cleaning is the cleaning power of the object to be cleaned and whether or not the substrate is corroded after cleaning. If the cleaning power of the detergent is low, problems may occur in subsequent processes, such as poor formation of fine patterns, poor deposition, and poor plating due to organic substances remaining on the metal substrate. When damage such as corrosion occurs to the substrate after cleaning, it is impossible to utilize the cleaned metal substrate, resulting in economic loss. In addition, if foreign substances and substances that promote corrosion remain on the metal surface, normal operation of the product is difficult and may cause failure within a short period of time. Therefore, it is necessary to develop a safe and environmentally friendly metal cleaner that has excellent cleaning power and does not cause corrosion of the substrate.

Existing metal cleaners use hazardous chemicals and are harmful to the human body and are not environmentally friendly, or have poor long-term metal corrosion resistance in the process of reducing toxicity even though their cleaning power is good. In one embodiment, by solving these existing problems, providing an eco-friendly metal cleaner having excellent cleaning power and not causing corrosion of metal substrates for a long time, securing work safety and storage stability and reducing harmfulness to the human body, which It is intended to provide a method for cleaning metal using the present invention.

One embodiment provides a metal cleaner comprising a purified corrosion inhibitor and an ester-based compound. The ester-based compound is propyl acetate, isopropyl acetate, n-butyl acetate, tert-butyl acetate, pentyl acetate, hexyl acetate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, amyl lactate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, or combinations thereof.

Another embodiment provides a metal cleaning method comprising the step of cleaning the metal with the metal cleaner.

The metal cleaner according to one embodiment has excellent cleaning power against various oil components and fluxes on the surface of a metal substrate, and is environmentally friendly because it secures work safety and storage stability without causing corrosion of the metal substrate and reduces harmfulness to the human body. The metal cleaner may exhibit long-term metal corrosion resistance. In the case of a product cleaned using such a metal cleaner, the safety and workability of the process may be improved, and the durability of the final product may be improved.

1 is a photograph of a plated specimen after cleaning with a metal cleaner according to an embodiment after oil is applied to the metal specimen.
2 is a photograph of a specimen plated without cleaning after oil is applied to the metal specimen.

Hereinafter, specific embodiments will be described in detail so that those skilled in the art can easily implement them. However, the present invention may be embodied in many different forms and is not limited to the embodiments set forth herein.

Terms used herein are merely used to describe exemplary implementations and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

As used herein, “combination thereof” means a mixture of constituents, laminates, composites, copolymers, alloys, blends, reaction products, and the like.

The terms “comprise,” “comprise,” or “have” are intended to indicate that there is an embodied feature, number, step, component, or combination thereof, but that one or more other features, numbers, or steps are present. It should be understood that it does not preclude the possibility of existence or addition of components, components, or combinations thereof.

One embodiment provides a metal cleaner to which a purification technique is applied, and specifically provides a metal cleaner containing a purified corrosion inhibitor. In one embodiment, by removing foreign substances in the corrosion inhibitor by purifying the corrosion inhibitor, to increase the corrosion resistance of the metal cleaner containing the same, and also to increase the eco-friendliness by using low-toxic raw materials for the metal cleaner. Here, the metal cleaning agent may be expressed as a metal cleaning composition, a metal cleaning composition, or a non-aqueous metal cleaning agent.

The corrosion inhibitor is a compound containing an atom such as -N-, -S-, or -O- having an unshared electron pair, and may be an additive having a function of inhibiting corrosion of a metal substrate in the metal cleaner. The corrosion inhibitor may be, for example, a compound having a functional group such as a nitro group (-NO ₂ ), a dialkoxy group, an amine group (-NH ₃ ), and the dialkoxy group may be a C1 to C3 dialkoxy group. For example, it may be a dimethoxy group or a diethoxy group. Specifically, the corrosion inhibitor may be a C1 to C10 alkane containing at least one of a nitro group, a dialkoxy group, and an amine group, or an amine in which a C1 to C10 alkyl group is substituted.

The C1 to C10 alkane may be, for example, a C1 to C8 alkane, a C1 to C6 alkane, a C1 to C5 alkane, or a C1 to C4 alkane, and may be, for example, methane, ethane, propane, or butane. The C1 to C10 alkyl group may be, for example, a C1 to C8 alkyl group, a C1 to C6 alkyl group, a C1 to C5 alkyl group, or a C1 to C4 alkyl group, and may be, for example, a methyl group, an ethyl group, a propyl group, a subscript group, and the like. The C1 to C10 alkyl group-substituted amine may be a primary amine in which one alkyl group is substituted, a secondary amine in which two alkyl groups are substituted, or a tertiary amine in which three alkyl groups are substituted.

The corrosion inhibitor is, for example, nitromethane, nitroethane, 1-nitropropane, 2-nitropropane, dimethoxy methane, dimethoxy ethane Contains dimethoxy ethane, dimethoxy propane, monoethyl amine, diethyl amine, triethyl amine, isopropyl amine, or combinations thereof can do. They can inhibit metal corrosion even in small amounts and are environmentally friendly because of their low harmfulness to the human body.

In one embodiment, in order to prevent the metal substrate from being corroded due to some contaminants in the detergent, a technique of purifying the corrosion inhibitor has been introduced. Purifying the corrosion inhibitor may be, for example, purification using a porous adsorbent such as activated carbon, silica clay, charcoal, alumina, zeolite, or molecular sieve. The porous adsorbent refers to a material having a plurality of pores of various sizes, such as micropores (20 nm or less in diameter), mesopores (20 to 50 nm in diameter), and macropores (50 nm or more in diameter). When a chemical substance passes through such a porous adsorbent, an adsorption reaction occurs due to physical and chemical interactions within the pores, and the chemical substance is purified through this process.

In one embodiment, by purifying the corrosion inhibitor with a porous adsorbent such as activated carbon, foreign substances in the detergent were removed by themselves. Accordingly, it is possible to increase the cleaning power of the metal cleaner and improve the corrosion resistance and long-term storage of the metal substrate.

The corrosion inhibitor may be purified by a method utilizing boiling point or specific gravity. For example, the corrosion inhibitor may be purified through a distillation method. Even in this case, it is possible to improve the corrosion resistance and long-term storage of the metal substrate while securing the cleaning power of the metal cleaner.

The purified corrosion inhibitor may be included in an amount of 0.1% to 10% by weight, for example, 1% to 7% by weight, or 1% to 4% by weight, based on the total weight of the metal cleaner. When the content of the corrosion inhibitor is as described above, the metal cleaner may exhibit excellent corrosion resistance while maintaining excellent cleaning power.

The metal cleaner according to one embodiment further includes an ester-based compound in addition to the purified corrosion inhibitor. The ester-based compound may include a C1 to C10 alkyl acetate, a C1 to C10 alkyl butyrate, a C1 to C10 alkyl lactate, a C1 to C10 alkyl hexanoate, or a combination thereof. Wherein C1 to C10 alkyl can be, for example, C1 to C8 alkyl, C1 to C6 alkyl, or C1 to C5 alkyl, such as methyl, ethyl, propyl, isopropyl, n-butyl, tert-butyl, pentyl, hexyl, etc. can

The ester-based compound is, for example, propyl acetate, isopropyl acetate, n-butyl acetate, tert-butyl acetate, pentyl acetate ), hexyl acetate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, hexyl butyrate , methyl lactate, ethyl lactate, propyl lactate, butyl lactate, amyl lactate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, or a combination thereof. They are eco-friendly, biodegradable, highly soluble in various resins, and have excellent detergency due to low harm to the human body and high work stability.

The ester-based compound may be included in the metal cleaner in an amount of 7% to 20% by weight, for example, 7% to 18% by weight, or 8% to 15% by weight based on the total weight. When the ester-based compound is included in this content range, the metal cleaner can implement excellent processability and safety while using environmentally friendly raw materials and exhibiting excellent cleaning power.

The metal cleaner may further include dimethyl carbonate. Dimethyl carbonate has a high solubility, so it can play a role in improving the cleaning power of metal cleaners, and it can be said to be an eco-friendly material because of its low harmfulness to the human body and high work safety. The dimethyl carbonate may be included in an amount of 10% to 50% by weight based on the total weight of the metal cleaner, for example, 20% to 45% by weight, 25% to 40% by weight, or 30% to 40% by weight. can be included as When the dimethyl carbonate is included in this content range, the metal cleaner can secure excellent corrosion resistance and work safety while exhibiting excellent cleaning power.

The metal cleaner may further include dibromomethane, trans-1,2-dichloroethylene, or a combination thereof. These can suppress the flammability of the ester-based compound in a gaseous state, improve the cleaning power of the metal cleaner, and add flame retardancy. The dibromomethane, trans-1,2-dichloroethylene, or a combination thereof may be included in an amount of 40% to 60% by weight based on the total weight of the metal cleaner, for example, 45% to 60% by weight, Or it may be included in 50% by weight to 60% by weight. In this case, the metal cleaner can realize excellent corrosion resistance and work safety while exhibiting excellent detergency and flame retardancy. When the dibromomethane, trans-1,2-dichloroethylene, or a combination thereof is excessively contained, it may not be economical due to an increase in process cost.

The metal cleaner according to an embodiment includes (1) 0.1% to 10% by weight of a purified corrosion inhibitor; (2) 7% to 20% by weight of propyl acetate, isopropyl acetate, n-butyl acetate, tert-butyl acetate, pentyl acetate, hexyl acetate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, pentyl butyrate, hexyl Esters comprising butyrate, methyl lactate, ethyl lactate, propyl lactate, butyl lactate, amyl lactate, methyl hexanoate, ethyl hexanoate, propyl hexanoate, butyl hexanoate, or combinations thereof based compounds; (3) 10% to 50% by weight of dimethyl carbonate; and (4) 40% to 60% by weight of dibromomethane, trans-1,2-dichloroethylene, or combinations thereof. In this case, the metal cleaner has excellent cleaning power against various oil components and fluxes on the surface of the metal substrate, and is environmentally friendly because it does not cause corrosion of the metal substrate, secures work safety and storage stability, and reduces harmfulness to the human body.

Meanwhile, the metal cleaner may further include a fluorine-based flame retardant. The fluorine-based flame retardant may include, for example, hydrofluorocarbon (HFC), hydrofluoroether (HFE), hydrofluoroolefin (HFO), or a combination thereof. The fluorine-based flame retardant may be included in an amount of 1% to 20% by weight based on the total weight of the metal cleaner. In this case, the metal cleaner may exhibit excellent detergency and flame retardancy at the same time.

The metal cleaner has excellent ability to dissolve various polymers and resins, and can be used as a polymer solubilizer, emulsifier, or diluent in addition to a detergent. For example, the metal cleaner may be used as a solubilizer, an emulsifier, or a diluent for acrylic resins, epoxy resins, and silicone resins.

Meanwhile, one embodiment provides a method of cleaning metal using the metal cleaner described above. A metal cleaning method according to an embodiment may include cleaning the metal with the above-described metal cleaning agent. Alternatively, the metal cleaning method may include purifying the corrosion inhibitor, mixing the purified corrosion inhibitor with a metal cleaner, and cleaning the metal with the metal cleaner.

Here, the step of purifying the corrosion inhibitor may be a method of purifying by passing the corrosion inhibitor through a porous adsorbent containing activated carbon, diatomaceous earth, charcoal, alumina, zeolite, molecular sieve, or a combination thereof, as described above. Alternatively, it may be a method of purifying by distilling the corrosion inhibitor.

The content of the corrosion inhibitor and the types and contents of the compositions included in the metal cleaner are as described above. The step of cleaning the metal may be, for example, cleaning by immersion, brush, spray, ultrasonic, or steam methods, and may be, for example, cleaning by ultrasonic methods and steam methods. An appropriate cleaning method can be applied according to the type and characteristics of the object to be cleaned.

Examples and comparative examples of the present invention are described below. The following examples are only examples of the present invention, but the present invention is not limited to the following examples.

Example 1

32.6% by weight of dimethyl carbonate (DMC), 55.6% by weight of dibromomethane (DBM), 10.0% by weight of n-butyl acetate, 1.8% by weight of 1-nitropropane purified with a porous adsorbent % to prepare a metal cleaner.

Example 2

Mixing 32.6% by weight of dimethyl carbonate (DMC), 55.6% by weight of dibromomethane (DBM), 10.0% by weight of ethyl butyrate, and 1.8% by weight of 1-nitropropane purified as a porous adsorbent to prepare a metal cleaner.

Example 3

32.6% by weight of dimethyl carbonate (DMC), 55.6% by weight of dibromomethane (DBM), 10.0% by weight of ethyl hexanoate, and 1.8% by weight of 1-nitropropane purified with a porous adsorbent Mix to make a metal cleaner.

Example 4

42.6% by weight of dimethyl carbonate (DMC), 45.6% by weight of dibromomethane (DBM), 10.0% by weight of n-butyl acetate, 1.8% by weight of 1-nitropropane purified with a porous adsorbent % to prepare a metal cleaner.

Example 5

52.6% by weight of dimethyl carbonate (DMC), 35.6% by weight of dibromomethane (DBM), 10.0% by weight of n-butyl acetate, 1.8% by weight of 1-nitropropane purified with a porous adsorbent % to prepare a metal cleaner.

Example 6

32.6% by weight of dimethyl carbonate (DMC), 55.6% by weight of dibromomethane (DBM), 10.0% by weight of n-butyl acetate, and 1.8% by weight of purified 1-nitropropane by distillation by mixing to prepare a metal cleaner.

Comparative Example 1

Dimethyl carbonate (DMC) 32.6% by weight, dibromomethane (DBM) 55.6% by weight, n-butyl acetate (n-Butyl Acetate) 10.0% by weight, unrefined 1-nitropropane 1.8% by weight Mix to make a metal cleaner.

Comparative Example 2

A metal cleaner was prepared by mixing 42.6% by weight of dimethyl carbonate (DMC), 55.6% by weight of dibromomethane (DBM), and 1.8% by weight of 1-nitropropane purified with a porous adsorbent.

Comparative Example 3

A metal cleaner was prepared by mixing 60.0% by weight of dimethyl carbonate (DMC), 38.2% by weight of dibromomethane (DBM), and 1.8% by weight of 1-nitropropane purified with a porous adsorbent.

Table 1 below is a table summarizing the design contents of Examples and Comparative Examples, and the unit of each value is % by weight.

Example 1 Example 2 Example 3 Example
4 Example
5 Example 6 Comparative Example 1 Comparative Example 2 Comparative Example 3 Furtherance DMC 32.6 32.6 32.6 42.6 52.6 32.6 32.6 42.6 60.0 DBM 55.6 55.6 55.6 45.6 35.6 55.6 55.6 55.6 38.2 n-butyl acetate 10.0 10.0 10.0 10.0 10.0 Ethyl butyrate 10.0 Ethyl hexanoate 10.0 NP 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8

Evaluation Example 1: Flame retardancy evaluation

The metal cleaners prepared in Examples 1 to 3 were subjected to flash point analysis (ASTM D92-18) according to the Cleveland open method, and the results are shown in Table 2 below.

flame retardant Example 1 O Example 2 O Example 3 O

Referring to Table 2, it is confirmed that all of the metal cleaners of Examples 1 to 3 have excellent flame retardancy.

Evaluation Example 2: Confirmation of Residual Foreign Matter

The metal cleaners prepared in Example 1 and Comparative Example 1 were subjected to thermogravimetric analysis (TGA) in the range of 25 ° C to 200 ° C to measure the residual foreign matter content in the cleaner, and the results are shown in Table 3 below.

Residual foreign matter content Surface of the material after cleaning Example 1 0.07% No stains upon visual inspection Comparative Example 1 0.49% There are many stains on visual inspection.

Referring to Table 3, in the case of Comparative Example 1 using an unrefined corrosion inhibitor, the residual foreign matter content was much higher than that of Example 1, and a large amount of stains were generated on the surface of the metal material after cleaning, which may cause problems in subsequent processes. expected to be able to

Evaluation Example 3: Evaluation of metal corrosion

While heating 100 mL of the metal cleaner prepared in Examples 1 to 6 and Comparative Example 1 above the boiling point, a reflux condenser is installed and prepared. In this, some of the degreased copper, brass, aluminum and stainless steel SUS specimens were immersed and the corrosion time of each metal specimen was checked, and the results are shown in Table 4 below. This is used as a basis for determining the corrosion resistance of metal materials. In Table 4 below, the unit of each numerical value is time, which means the time taken for corrosion to occur.

Copper brass aluminum SUS Example 1 5 1.5 > 8 > 8 Example 2 3 One > 8 > 8 Example 3 2.5 1.5 > 8 > 8 Example 4 5 1.5 > 8 > 8 Example 5 4 One > 8 > 8 Example 6 5 1.5 > 8 > 8 Comparative Example 1 0.5 0.5 > 8 > 8

Referring to Table 4, in the case of Comparative Example 1, which did not go through the refining process, corrosion occurred after 0.5 hours in the copper and brass specimens, so the corrosion resistance was not excellent, but in the case of Examples 1 to 6, the corrosion resistance of the copper and brass specimens This was improved from Comparative Example 1, and corrosion did not occur in aluminum and SUS specimens even after 8 hours or more, indicating excellent corrosion resistance in all specimens such as copper, brass, aluminum and SUS. Here, in the case of Examples 1 to 4 and 6, after the above evaluation, an evaluation of leaving at room temperature for 30 minutes or more was additionally performed, and as a result, no corrosion or discoloration appeared even after being left at room temperature. Accordingly, it can be seen that the metal cleaners of the Examples secured long-term metal corrosion resistance.

Evaluation Example 4: Eco-friendliness

In order to replace existing halogen-based organic solvents in an eco-friendly way, Article 7 of the Clean Air Conservation Act and GSK solvent selection guide were used. Table 5 below provides information on trichlorethylene (TCE) and dichloromethane (MC) previously used and n-butyl acetate and dimethyl carbonate used in Examples.

TCE MC n-butyl acetate DMC waste recyclability 4 3 7 4 environmental impact 4 6 7 8 harmless to human body 2 4 8 7 flame retardant 6 6 8 6 stability 10 9 10 10 life span 7 7 5 8 Legal and regulatory status - Air Pollutants - Harmful Air Monitoring Substances
-Specific atmospheric pollutants - Air Pollutants
-Hazardous atmospheric monitoring substances
-Specific atmospheric pollutants - -

Each score in Table 5 is indicated from 0 to 10, and the closer to 10, the better the solvent selection. Trichlorethylene (TCE) and dichloromethane (MC), which were used in existing metal cleaners, are included in the volatile organic compounds recognized as causes of air pollution in accordance with Article 7 of the Clean Air Conservation Act. These solvents are judged to be substances that may directly or indirectly harm human health or the growth of animals and plants even at low concentrations due to long-term ingestion or exposure, and the need for replacement is increasing. Accordingly, based on the GSK solvent selection guide, eco-friendly solvents that can replace these solvents were identified, and ester compounds such as acetate, lactate, and dimethyl carbonate were confirmed to have a high eco-friendliness index. This means that the possibility of using eco-friendly raw materials with less harm to the human body can increase in the detergent market, where most of the existing hazardous chemicals are in the composition. In one embodiment, dimethyl carbonate is used instead of TCE and MC, and esters such as acetate are used. By using the compound, the eco-friendliness and safety of the metal cleaner were secured.

Evaluation Example 5: Detergency

Prepare a metal specimen with a size of 20 x 40 mm in which 0.6 μL of metalworking oil (Oil A, Oil B, and Oil C) has been applied and left for at least 3 hours. 100 mL of the metal cleaner prepared in Examples 1 to 6 and Comparative Examples 1 to 3 was prepared and the prepared metal specimen was immersed in ultrasonic cleaning (55 ° C, 1 minute) and steam cleaning (boiling point, 1 minute), and then the metal The surface state of the specimen was checked using a Dyne pen, and the results are shown in Table 6 below. The higher the dyne value, the higher the cleaning power. Here, oil A is a punching oil, oil B is an anti-rust oil, and oil C is a flux oil.

Oil A Oil B Oil C Example 1 48 42 48 Example 2 40 36 50 Example 3 52 40 54 Example 4 50 48 44 Example 5 48 Insufficient cleaning 46 Example 6 48 43 49 Comparative Example 1 54 Insufficient cleaning Insufficient cleaning Comparative Example 2 54 36 56 Comparative Example 3 53 Insufficient cleaning 41

In Table 6, the unit of each numerical value is a dyne (Dyn). Here, insufficient cleaning means that the specimen is not properly cleaned, so measurement is difficult or the evaluation value is 30 or less. Referring to Table 6, the metal cleaners prepared in Examples 1 to 4 and 6 showed high detergency for all three types of oil. In the case of Example 5, only oil A and oil B showed high detergency. In the case of Comparative Example 1 in which purification was not performed, it was confirmed that foreign matter components remained after cleaning due to low cleaning power for Oil B and Oil C, and these foreign matter components are expected to cause defects. In the case of Comparative Example 3, it is confirmed that the detergency for Oil B is low.

Evaluation Example 6: Comparison of detergency by process

Prepare a metal specimen with a size of 20 x 40 mm in which 0.6 μL of metalworking oil (Oil A, Oil B, and Oil C) has been applied and left for at least 3 hours. 100 mL of the metal cleaner prepared in Example 1 was prepared and immersed the prepared metal specimen, and cleaning processes 1 and 2 were performed as follows.

Cleaning Process 1: After ultrasonic cleaning (55℃, 2 minutes), immersion (room temperature, 2 minutes), and steam cleaning (boiling point, 2 minutes), the surface condition of the specimen is checked using a Dyne pen. do.

Cleaning process 2: After immersion (room temperature, 2 minutes), ultrasonic cleaning (55 ° C, 2 minutes), and immersion (room temperature, 2 minutes), the surface state of the specimen is checked using a Dyne pen .

cleaning process 1 cleaning process 2 Oil A detergency 52 48 Oil B cleaning power 40 32 Oil C cleaning power 56 40

In Table 7, the unit of each numerical value is Dyn. Referring to Table 7, it can be seen that cleaning process 1 in which steam cleaning was additionally performed exhibited higher cleaning power.

Evaluation Example 7: Resin Solubility

After evenly applying 0.100 g of acrylic resin and 0.100 g of epoxy resin to a size of 10x10x0.2 mm on a slide glass, dipping in 50 mL of the detergent prepared in Examples 1 to 3 and Comparative Example 2, the time required for the resin to completely dissolve It was confirmed, and the results are shown in Table 8 below.

acrylic resin epoxy resin Example 1 45 30 Example 2 30 30 Example 3 45 30 Comparative Example 2 70 30

In Table 8, the unit of each value is seconds. Referring to Table 8, in the case of Comparative Example 2, it can be seen that the solubility of the acrylic resin is low. In the case of Examples 1 to 3, it can be confirmed that both the acrylic resin and the epoxy resin have high solubility.

Evaluation Example 8: Plating evaluation after cleaning

In general, metal materials can obtain various effects such as rust prevention and lubrication by applying oil. However, when a post-process such as plating is applied, detergency against oil must be secured. In order to confirm the effect in the post-process of the metal cleaner according to one embodiment, the effect of the post-process on the specimens cleaned with the metal cleaner of Example 1 and the specimens not cleaned was evaluated.

After oil was applied to copper specimen 1, it was cleaned with the metal cleaner prepared in Example 1, and the cleaning condition was good. Plating with nickel was performed here, and the results are shown in FIG. 1 . Referring to the photograph of FIG. 1 , it can be seen that the plated surface was uniformly plated and the plated surface condition was good. As a comparative example, after oil was applied to copper specimen 2, plating was performed without cleaning, and the results are shown in FIG. 2 . Referring to FIG. 2 , it can be seen that the surface condition is not good due to non-uniform plating. Through this, it can be confirmed that when the metal cleaner according to the embodiment is applied, excellent effects can be exhibited in a post-process such as plating.

Although the preferred embodiments have been described in detail, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts defined in the following claims are also within the scope of the present invention. it belongs

Claims (16)

As a metal cleaner comprising a purified corrosion inhibitor and an ester-based compound,
The ester-based compound is a metal cleaner comprising a C1 to C10 alkyl acetate, a C1 to C10 alkyl butyrate, a C1 to C10 alkyl lactate, a C1 to C10 alkyl hexanoate, or a combination thereof. In paragraph 1,
The corrosion inhibitor is
A C1 to C10 alkane containing at least one of a nitro group, a C1 to C3 dialkoxy group and an amine group, or
A metal cleaner wherein the C1 to C10 alkyl group is an amine substituted. In paragraph 1,
The corrosion inhibitor is nitromethane, nitroethane, 1-nitropropane, 2-nitropropane, dimethoxy methane, dimethoxy ethane, dimethoxy propane, monoethylamine, diethylamine, triethylamine, isopropylamine, or these A metal cleaner comprising a combination of In paragraph 1,
The corrosion inhibitor is purified with a porous adsorbent,
The porous adsorbent is a metal cleaner comprising activated carbon, diatomaceous earth, charcoal, alumina, zeolite, molecular sieve, or a combination thereof. In paragraph 1,
The corrosion inhibitor is a metal cleaner that is purified by a distillation method. In paragraph 1,
The purified corrosion inhibitor is a metal cleaner that is contained in 0.1% to 10% by weight relative to the metal cleaner. In paragraph 1,
The ester-based compound is a metal cleaner contained in 7% by weight to 20% by weight relative to the metal cleaner. In paragraph 1,
The metal cleaner further comprises dimethyl carbonate. In paragraph 8,
The dimethyl carbonate is a metal cleaner contained in 10% to 50% by weight relative to the metal cleaner. In paragraph 1,
The metal cleaner further comprises dibromomethane, trans-1,2-dichloroethylene, or a combination thereof. In paragraph 10,
The dibromomethane, trans-1,2-dichloroethylene, or a combination thereof is included in an amount of 40% to 60% by weight based on the metal cleaner. In paragraph 1,
The metal cleaner
0.1% to 10% by weight of a purified corrosion inhibitor;
7% to 20% by weight of an ester-based compound comprising a C1 to C10 alkyl acetate, a C1 to C10 alkyl butyrate, a C1 to C10 alkyl lactate, a C1 to C10 alkyl hexanoate, or a combination thereof;
10% to 50% by weight of dimethyl carbonate; and
40% to 60% by weight of dibromomethane, trans-1,2-dichloroethylene, or a combination thereof;
A metal cleaner comprising a. In paragraph 1,
The metal cleaner further comprises a fluorine-based flame retardant. In paragraph 1,
The metal cleaner is a metal cleaner that is used as a polymer solubilizer, emulsifier, or diluent. A method of cleaning metal comprising the step of cleaning metal with a metal cleaner according to any one of claims 1 to 14. In clause 15,
wherein the step of cleaning the metal is cleaning by immersion, brush, spray, ultrasonic, and/or steam methods.

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