KR100859802B1 - Cleaning composition of alluminum form and cleaning method - Google Patents

Abstract

A cleaning composition for an aluminum mold is provided to remove a concrete compound attached to an aluminum mold used in various buildings and structures and an organic release coating layer at the same time, while not adversely affecting the human body. A cleaning composition for an aluminum mold comprises 20-60 wt% of nitric acid, 38.7-74.0 wt% of water, 0.2-1.0 wt% of a metal anti-corrosive agent, 1-10 wt% of an organic coating layer removing agent, and 0.1-1.0 wt% of a surfactant. The metal anti-corrosive agent is at least one selected from the group consisting of cyclohexylamine(C6H13N), aniline(C6H7N) and 1,2,3-benzotriazole(C6H5N3). The organic coating layer removing agent is at least one selected from the group consisting of toluene(C7H8), xylene(C8H10), isopropanol(C3H8O), n-butanol(C4H10O), cyclohexanone(C6H10O), methyl ethyl ketone(C4H8O), methyl isobutyl ketone(C6H12O), ethyl acetate(C4H8O2), butyl acetate(C6H12O2), 2-ethoxyethyl acetate(C6H12O3), ethylene glycol monoethyl ether(C4H10O2), ethylene glycol monobutyl ether(C6H14O2), propylene glycol monomethyl ether(C4H10O2) and ethylene glycol monomethyl ether acetate(C5H10O3).

Description

Aluminum formwork cleaning liquid composition and cleaning method using the same {Cleaning composition of alluminum form and Cleaning method}

The present invention relates to an aluminum formwork cleaning liquid composition and a cleaning method using the same, and more particularly, by adding a metal corrosion inhibitor, an organic film remover, and a surfactant to a nitric acid (NITRIC ACID) acid cleaning solution. It is possible to remove the concrete compound and release agent attached to the aluminum formwork in a short time, and to be able to reuse the cleaned aluminum form several times repeatedly to maximize the workability in the field, and there is no need to secure space for loading large formwork. The present invention relates to an aluminum formwork washing liquid composition and a cleaning method using the same.

In general, when a building is constructed, reinforcing bars are formed to form a skeleton, and formwork is installed on the inner and outer sides of the skeleton, and then concrete is cast between the inner and outer molds to cure for a certain period of time.

As mentioned above, the formwork used in the construction site is made of plywood, lumber, metal, etc., but it is damaged or deformed due to moisture, temperature, external impact, friction, corrosion, etc. when used more than once. This resulted in poor dimensional stability, and due to the high weight, there was always a potential risk of poor site construction and building collapse.

As a result, the use of environmentally friendly aluminum formwork with excellent physical properties such as light weight, strength, processability, and corrosion resistance is increasing day by day to minimize site damage and property damage at construction sites.

As such, the aluminum formwork is increasing in use, and once used aluminum formwork can be reused by removing the adhered concrete compound, mold release agent and other contaminants. A conventional cleaning method for this purpose is water jet cleaning. ), Chemical cleaning and blast cleaning have been performed, and as an example of a chemical cleaning method, a technology related to a polishing agent for recycling euroforms is disclosed in Korean Patent Publication No. 10-2007-0007239. It consists of a debris remover selected from sodium chlorate, sodium persulfate and sodium chloride and a chemical abrasive selected from sodium hydroxide, potassium hydroxide and sodium silicate.

However, conventional cleaning methods have poor removal of concrete compounds and mold release agents and damage to formwork, resulting in poor dimensional stability. In particular, the use of chemical cleaning methods with high concentrations of hydrochloric acid, hydrofluoric acid, phosphoric acid, etc., is harmful to the human body. Problems such as unavailability due to the generation and corrosion of aluminum formwork occur, and work efficiency such as reprocessing and rework due to lack of cleaning power is reduced.

An object of the present invention for solving the above problems is to provide a cleaning solution composition composed of a metal corrosion inhibitor, an organic film remover and a surfactant in a nitric acid (NITRIC ACID) acid cleaning solution, and a cleaning method using the same. To reduce the harmfulness of the human body while easily removing the concrete compound attached to the aluminum mold used for office buildings, special structures, etc. and the release agent, which is an organic coating applied in advance, to prevent the adhesion of the concrete compound. There is this.

Features of the present invention for achieving the above object is 20 to 60% by weight of nitric acid, 38.7 to 74.0% by weight of water, 0.2 to 1.0% by weight of metal corrosion inhibitor, 1 to 10% by weight of organic film remover, and 0.1 to 1.0 surfactant It is characterized by providing a detergent composition comprising a weight percent.

And another feature of the present invention is the detergent composition is put in an acid resistant container and maintained by heating to 50 ~ 70 ℃ and immersed in aluminum formwork for 10 to 30 minutes and then taken out and stagnated for 2 to 10 minutes to bury in aluminum formwork The present invention provides a cleaning method for removing concrete compounds, mold release agents and other contaminants attached to concrete formwork by removing the acidic aqueous solution composition.

Hereinafter, an embodiment of the present invention will be described in more detail.

The aluminum formwork cleaning liquid composition according to the present invention is largely composed of a nitric acid-based component, a metal corrosion inhibitor, an organic film remover, a surfactant, and water (H ₂ O).

Among these, nitric acid is preferably 20 to 60% by weight of the total weight. When the mixed amount of nitric acid is less than 20% by weight, the erosion and decomposition performance of the concrete compound attached to the aluminum formwork is degraded, so that the long time is required to remove the concrete compound from the aluminum formwork. Excessive time and cost, such as needing to be reprocessed additionally because it is not necessary and not removed cleanly, and if the amount of nitric acid mixture exceeds 60% by weight, harmful nitrate gas (fume, fume) is generated when the temperature rises. Corrosion of the aluminum formwork and the increase in the thickness of the dimensional stability, such as the change in thickness may reduce the number of repeated reuse.

The amount of the aromatic hydrocarbon compound, which is a metal corrosion inhibitor, is preferably 0.2 to 1.0% by weight, and when the amount of the metal corrosion inhibitor is less than 0.2% by weight, the effect of preventing corrosion is lowered and the amount of corrosion of aluminum formwork due to nitric acid increases when the temperature rises. This results in a decrease in the dimensional stability, such as a change in thickness, and a reduction in the number of repeated reuses, resulting in an excessive cost. When the amount of the metal corrosion inhibitor exceeds 1.0% by weight, the removal of the concrete compound and the release agent is rather adversely affected. .

These metal corrosion inhibitors are cyclohexylamine (C ₆ H ₁₃ N), aniline (C ₆ H ₇ N), 1,2,3-benzotriazole (C ₆ H ₅ N ₃ ), and the like. It is used as a mixture above.

In addition, the mixing amount of the organic film remover is preferably 1 to 10% by weight, and toluene (C ₇₎ may be used as an organic compound of aromatic, cycloaliphatic, aliphatic hydrocarbons and their derivatives, ethers, esters, their derivatives and alcohols. H ₈ ), xylene (C ₈ H ₁₀ ), isopropanol (C ₃ H ₈ O), normal butanol (C ₄ H ₁₀ O), cyclohexanone (C ₆ H ₁₀ O), methyl ethyl ketone (C ₄ H ₈ O), methyl isobutyl ketone (C ₆ H ₁₂ O), ethyl acetate (C ₄ H ₈ O ₂ ), butyl acetate (C ₆ H ₁₂ O ₂ ), 2-ethoxyethyl acetate (C ₆ H ₁₂ O ₃ ), ethylene glycol monoethyl ether (C ₄ H ₁₀ O ₂ ), ethylene glycol monobutyl ether (C ₆ H ₁₄ O ₂ ), propylene glycol monomethyl ether (C ₄ H ₁₀ O ₂ ), ethylene glycol monomethyl ether Acetates (C ₅ H ₁₀ O ₃ ), and these organic compounds are used in one or two or more mixtures.

When the amount of the organic film remover is less than 1.0% by weight, the performance of penetrating into the mold release agent, which is an organic film coated on the aluminum formwork, softens and decomposes. The inability to remove would result in increased time and expense. If the amount of the organic film remover exceeds 10% by weight, volatile gases are generated when the temperature rises, which may cause a risk of explosion or fire in a closed workplace.

As for the mixture amount of surfactant, 0.1-1.0 weight% is preferable. A compound having both a hydrophilic group and a hydrophobic group in the molecule as a surfactant to enable uniform mixing of the organic compound and the acid composition, which is the organic film remover, and to facilitate the removal of oils and other contaminants attached to the aluminum formwork. There are various kinds such as anionic, cationic and nonionic.

Surfactants that can be used include polyoxyethylene lauryl ether, polyoxyethylene octyldecyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene nonylphenyl ether (polyoxyethylene nonylphenyl ether) Polyoxyethylene Nonylphenol Ether), Dimethyl Alkylamine Derivative, and the like, and the compounds are used in one or two or more mixtures.

If the amount of the surfactant is less than 0.1% by weight, it is difficult to remove the oil-based components such as lubricating oil and rust-preventive oil on the aluminum formwork, and when the oil-soluble component is not completely removed, the adhesion to the aluminum formwork is reduced when the release agent, which is an organic coating, is applied. When concrete is poured, concrete is easily attached to the aluminum formwork and contaminated, so it is difficult to remove it.

If the amount of the surfactant is more than 1.0% by weight, the synergistic effect of the oil and fat component removal cannot be expected according to the amount of the excess mixture, and it is unnecessary to remove the surfactant component upon washing the metal compound and the release agent attached to the aluminum formwork. Additional use of water is required, which leads to an increase in costs.

Hereinafter, the configuration of the present invention in detail through the following examples.

1. Test body production

1) Concrete test body production

For the test body fabrication used for the weight loss test of the concrete compound, uniformly mix 20 g of Portland cement and 50 g of sand having a particle size of 0.5 to 2.0 mm, add 10 to 15 g of water, and uniformly mix it using a stirrer, The length and thickness were made to be 4 cm x 4 cm x 1.5 cm, and the resultant was cured for 7 days.

2) Fabrication of test pieces for aluminum formwork corrosion inhibition test

A-shaped aluminum formwork cut to a size of 63 mm x 145 mm was used as a test piece.

3) Manufacture of test piece for release agent removal ability test

After the release agent coating solution was applied to a thickness of about 15 to 30 μm in an L-shaped aluminum die cut to a size of 100 mm × 145 mm, it was used as a test piece for 24 hours at room temperature.

2. Aluminum Die Washing Liquid Manufacture

As an embodiment of the present invention, aluminum die washing solution was prepared as shown in Table 1 below, and a phosphoric acid composition used as a conventional pickling solution was used as a comparative example.

Composition Example Comparative example 1a 1b 1c 2a 2b 2c Nitric Acid (HNO ₃ ) 60.0 20.0 35.0 - - - Phosphoric Acid (H3PO4) - - - 60.0 20.0 35.0 Metal corrosion inhibitor 0.2 0.5 1.0 0.2 0.5 1.0 Organic film remover 1.0 5.0 10.0 - - - Surfactants 0.1 0.5 1.0 - - - Water (H ₂ O) 38.7 74.0 53.0 39.8 79.5 64.0

In Table 1 the units are weight percent.

3. Comparison test of physical properties of aluminum formwork washing liquid

1) Weight loss test of concrete compound test body

Example 1a, 1b, 1c and Comparative Examples 2a, 2b, 2c solution composition while maintaining the 60 ℃ immersed concrete test body prepared above 10 minutes after taking out to remove the moisture after weighing 15 hours after drying at room temperature The weight change before and after dipping was measured and the results are shown in Tables 2 and 3 below.

When looking at the increase and decrease (%) according to the number of immersion of the concrete compound specimens of Examples 1a, 1b, 1c of Table 2 up to 1 to 15 times, there is a mutual difference, but the weight is markedly reduced. Sand present in the test body by eroding or destroying the test body by reacting the nitric acid component in the pickling solution composition of Examples 1a, 1b, and 1c of Table 1 with the Portland cement component, which is a component of the concrete compound, in a short time. As the number of times decreased, as the concentration of nitrate decreased due to the reaction with the concrete compound, the weight loss effect gradually decreased, but the number of immersion showed up to 15 times. have.

However, when looking at the rate of change (%) of Comparative Examples 2a, 2b, and 2c of Table 3, the rate of change (%) of the concrete compound was significantly lower than that of Examples 1a, 1b, and 1c of Table 2, in particular, In the case of 2b and 2c of 3), the weight of the concrete compound test specimen increases as the number of immersions is repeated. This is due to the fact that phosphoric acid is weaker than nitric acid and the erosion and destruction ability of concrete compound is weak. In addition, it is slightly reduced by reaction with constituents of concrete compound in one immersion. As the weight increases, the weight increases as the phosphate is generated by the reaction with the concrete compound test specimen, and the weight increases as the phosphate is attached to the test surface and gradually grows. Finally, the removal and dropping of the concrete compound from the aluminum formwork, which is the object of the present invention, is eliminated. Results in a factor that makes this impossible.

2) Corrosion inhibitory effect test of aluminum formwork

Example 1a, 1b, 1c and Comparative Examples 2a, 2b, 2c solution composition prepared in accordance with the contents of Table 1 while maintaining the 65 ℃ ℃ horizontally and vertically 70 mm × 150 mm sized aluminum dies After taking out every hour and washed with tap water to completely remove the water and the weight was measured by measuring the weight change before / after immersion, the results are shown in Table 4 and Table 5.

As shown in Table 4, Examples 1a, 1b and 1c showed a slight change in the weight of the aluminum formwork itself before and after immersion, and this shows that the corrosion inhibitor contained in the cleaning liquid composition inhibits corrosion by nitric acid. . Although there is a difference in the content of the corrosion inhibitor in the compositions of Examples 1a, 1b, and 1c, the weight reduction of the aluminum formwork appears to be almost similar, and thus the difference in the effect of the corrosion inhibitor according to the change in the content may be insignificant. The slight change in weight indicates that it is possible to secure the dimensional stability of the new aluminum formwork, which is an initial new material, and that the economical efficiency is excellent, such as cost reduction and construction time, due to repeated reuse.

However, when looking at the increase and decrease (g) of Comparative Examples 2a, 2b and 2c of Table 5, the weight of the aluminum formwork is remarkably reduced by 4 to 13 times compared to Examples 1a, 1b and 1c of Table 4, and the aluminum formwork The corrosion inhibitory effect of the corrosion inhibitor in the phosphoric acid-containing composition such as discoloration may not be expected.

3. Release agent removal test

Example 1a, 1b, 1c and Comparative Examples 2a, 2b, 2c solution composition prepared according to the contents of Table 1 while maintaining the temperature of 65 ℃ releasing agent test piece for removal ability test immersed in each solution composition after 10 minutes Immediately washed with running tap water to confirm the degree of release of the release agent from the aluminum formwork, the results are shown in Table 6 below.

As shown in Table 6, Examples 1a, 1b, and 1c showed a result of removing 98% or more of the organic coating, which is a release agent, while Comparative Examples 2a, 2b, and 2c showed significantly lower results. This is made possible by the addition of aromatic, aliphatic, cycloaliphatic hydrocarbons or alcoholic organic compounds which are organic film removers in the composition. These organic compounds penetrate into the organic film, which is a release agent adhered to the aluminum formwork, soften or destroy, thereby inducing dropping from the aluminum formwork surface.

As described above, the present invention calculates nitric acid (NITRIC ACID) containing organic film remover, metal corrosion inhibitor, and surfactant to remove concrete compound and release agent attached to aluminum formwork (ALUMINUM FORM) used in constructing concrete building structures. As an aqueous solution composition for cleaning, it removes the release agent and other contaminants, which are organic coatings applied to the aluminum formwork and prevents adhesion of the concrete compound, in a short time and easily, and can reuse the aluminum formwork several times. It is effective in maximizing workability and securing economic feasibility.

Claims (5)

20-60 wt% nitric acid, 38.7-74.0 wt% water, 0.2-1.0 wt% metal corrosion inhibitor, 1-10 wt% organic film remover, and 0.1-1.0 wt% surfactant Composition. The method of claim 1, wherein the metal corrosion inhibitor is one of cyclohexylamine (C ₆ H ₁₃ N), aniline (C ₆ H ₇ N), 1,2,3-benzotriazole (C ₆ H ₅ N ₃ ) Aluminum formwork washing liquid composition, characterized in that it is selected and used above. The method of claim 1, wherein the organic film remover is toluene (C ₇ H ₈ ), xylene (C ₈ H ₁₀ ), isopropanol (C ₃ H ₈ O), normal butanol (C ₄ H ₁₀ O), cyclohexanone (C ₆ H ₁₀ O), methyl ethyl ketone (C ₄ H ₈ O), methyl isobutyl ketone (C ₆ H ₁₂ O), ethyl acetate (C ₄ H ₈ O ₂ ), butyl acetate (C ₆ H ₁₂ O ₂ ), 2-ethoxyethyl acetate (C ₆ H ₁₂ O ₃ ), ethylene glycol monoethyl ether (C ₄ H ₁₀ O ₂ ), ethylene glycol monobutyl ether (C ₆ H ₁₄ O ₂ ), propylene glycol monomethyl Ether (C ₄ H ₁₀ O ₂ ), Aluminum die washing liquid composition, characterized in that at least one selected from ethylene glycol monomethyl ether acetate (C ₅ H ₁₀ O ₃ ) used. The method of claim 1, wherein the surfactant is polyoxyethylene lauryl ether, polyoxyethylene octyldecyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene A non-polyphenol ether (Polyoxyethylene Nonylphenol Ether), Dimethyl alkyl amine derivative (Dimethyl Alkylamine Derivative), at least one aluminum die cleaning liquid composition characterized in that it is used. The washing liquid composition according to any one of claims 1 to 4 is put in an acid resistant container and maintained at 50 to 70 ° C., maintained by heating to 50 to 70 ° C., dipped in aluminum form, held for 10 to 30 minutes, and taken out for 2 to 10 minutes. Washing method using an aluminum formwork washing liquid composition, characterized in that washing with water.