KR20230125449A - Manufacturing Method of Eco-friendly Rust remover which has Volatile Corrosion Inhibiting function - Google Patents

Abstract

The present invention relates to a method for manufacturing an eco-friendly rust remover with a rust resistance function. According to the present invention, a rust remover with a rust resistance function is harmless to a human body by using a fermented food product with high biodegradability, food additives, and the like. Moreover, the rust remover has the high biodegradability to be discarded after being used without an additional discarding process. The rust remover also uses organic acid as a main reductant. Therefore, the rust remover does not provide inconvenience like smell or a risk of use. The rust remover forms a water-soluble rust resistance film after rust on a metal surface is removed. So, the rust remover can be used without an additional rust resistance process after removing the rust. The rust remover does not cause a state change or discoloration on the metal surface after being used unlike a rust control agent or a product composed of general phosphoric acid or phosphate. Accordingly, the rust remover with the rust resistance function can be used to remove the rust from a precision machinery component, a vehicle component, and the like. To achieve the purpose of the present invention, the method for manufacturing an eco-friendly rust remover with a rust resistance function comprises: a first mixing and agitating unit mixing a rust removal ingredient and a contaminant on the metal surface; a second mixing and agitating unit mixing a rust resistance ingredient; and a third mixing and agitating unit mixing and agitating a chemical forming a hydrophilic rust resistance film on the metal surface.

Description

Manufacturing Method of Eco-friendly Rust Remover which has Volatile Corrosion Inhibiting function}

The present invention relates to a method for manufacturing a rust remover that removes contaminants or rust from a metal surface by using a biodegradable material. It can be disposed of without a separate wastewater treatment process after use, and it is an eco-friendly rust remover manufacturing method that eliminates the inconvenience of using rust removers made of inorganic acids or the harmfulness to the human body due to odor generation.

As the metal-related industry develops, the production of various metal products using ferrous and non-ferrous metals is increasing, but industrial losses due to corrosion occurring during transportation and storage of these products are increasing as much as production is being made.

In the case of the United States, about 3% of GNP is industrial loss due to corrosion, and vehicle defects due to corrosion are also a serious situation in the automobile industry.

In order to remove the rust of metal products generated by such corrosion, rust removers are mostly manufactured with inorganic acids as reducing agents, or by using chelating agents, precipitants, odor eliminators, etc. with organic acids and organic salts. Odor removers are mostly composed of harmful chemicals.

In particular, hydrogen sulfide is highly toxic and is registered as a hazardous substance in OSHA, TSCA, etc., so its use is limited. They are regulated hazardous drugs. In addition, benzotriazoles are used, but benzotriazoles are non-biodegradable substances and are not environmentally friendly as they are registered as REACH (Registration, Evaluation, Authorization & Restriction of Chemicals) regulatory preliminary substances in the European Union. In addition, most conventional rust removers do not have a rust prevention function, so they had to be treated separately after rust removal. In the case of products with a rust control function, a film is formed on the metal surface, so most of the surface state after rust removal, such as automobile parts and machine parts Products that do not require change have the disadvantage of not being usable. Prior art of such a rust remover includes Republic of Korea Patent No. 102280544 "Method of manufacturing paint stripper, rust remover, and degreaser using silver nanoparticles" (Registration date: July 16, 2021) and Republic of Korea Patent No. 102155545 "Eco-friendly rust control agent" And how to use it (registration date: 2020.9.8) Korean Patent Registration No. 101801002 "Rust removal composition and rust removal method using the same" (registration date: 2017.11.17), etc. are disclosed.

(1) Republic of Korea Patent No. 102280544 "Method for manufacturing paint stripper, rust remover, and degreaser using silver nanoparticles" (registration date: 2021.7.16) (2), Republic of Korea Patent No. 102155545 "Eco-friendly rust control agent and method of use (registration date: 2020.9.8) (3) Korean Registered Patent No. 101801002 "Rust removal composition and rust removal method using the same" (registration date: 2017.11.17), etc. are disclosed.

The purpose of the present invention is to supplement the environmental pollution and disadvantages in use that occur when using a rust remover due to the use of inorganic acid, etc., and to maintain the surface state of the metal without color change by not generating a rust transition material on the metal surface after rust removal. Chemicals with high biodegradability and increased economic effects due to simplification of the production process by adding anti-corrosion function that allows metal products to be used without separate anti-rust treatment by widening the range of objects and removing secondary corrosion that occurs after rust removal An object of the invention is to make an environmentally friendly rust remover that can be disposed of without a separate disposal procedure when discarded after use.

In order to achieve the above object, the first mixing and stirring step of mixing the contaminants and rust removal components on the metal surface, the second mixing and stirring step of mixing the rust preventive component, and the mixing and stirring agent for forming a hydrophilic rust preventive film on the metal surface It is characterized in that it consists of 3 mixing and stirring steps.

In addition, the mixed medicine is 100 to 200 parts by weight of distilled water, 100 to 200 parts by weight of glycolic acid, 50 to 100 parts by weight of citric acid, 25 to 50 parts by weight of malic acid, 30 to 50 parts by weight of sodium gluconate, 30 to 50 parts by weight of sodium caprylate Part, polyvinyl alcohol 20 to 50 parts by weight, polysorbate 80, characterized in that 20 to 50 parts by weight.

The rust remover with anti-rust function of the present invention is harmless to the human body by using fermented food and food additives with high biodegradability, and also has high biodegradability that can be discarded after use without a separate disposal process, and organic acid is used as the main reducing agent. There is no danger of use or inconvenience such as smell, and it has the effect of forming a water-soluble rust-preventive film after removing rust from the metal surface so that it can be used without a separate rust-prevention process after removing rust. Unlike other products, it does not cause discoloration or state change on the metal surface after use, so it has the advantage that it can be used for rust removal of precision machine parts and automobile parts.

1 is a process flow chart of a method for manufacturing an eco-friendly rust remover having a rust-preventing function.

Hereinafter, the manufacturing method of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, 100 to 200 parts by weight of glycolic acid, 50 to 100 parts by weight of citric acid, and 25 to 50 parts by weight of malic acid are added to 1000 parts by weight of distilled water of the present invention in a mixing stirrer to mix and dissolve the first mixing and stirring step ( S10), a second mixing and stirring step (S20) of adding 30 to 50 parts by weight of sodium gluconate and 30 to 50 parts by weight of sodium caprylate to the mixed and dissolved solution and mixing and dissolving 20 to 50 parts by weight of polyvinyl alcohol in the mixed and dissolved solution It consists of a third mixing and stirring step (S30) of mixing and dissolving 50 parts by weight and 20 to 50 parts by weight of polysorbate (80).

The mixed medicine is 100 to 200 parts by weight of distilled water, 100 to 200 parts by weight of glycolic acid, 50 to 100 parts by weight of citric acid, 25 to 50 parts by weight of malic acid, 30 to 50 parts by weight of sodium gluconate, 30 to 50 parts by weight of sodium caprylate , Polyvinyl alcohol 20 to 50 parts by weight, polysorbate 80, composed of 20 to 50 parts by weight

The process of manufacturing a rust remover having an anti-rust function according to the above configuration is as follows.

As shown in Figure 1)

In the first mixing and stirring step (S10), glycolic acid, citric acid, and malic acid, which have a function of removing rust and contaminants, are stirred for 20 minutes at a speed of 25 RPM/min. at room temperature (23 degrees Celsius) using a stirrer with distilled water. . Gluconic acid is an eco-friendly material with a biodegradability of more than 99% and has functions of cleaning the surface of metals and removing rust. Citric acid is a food additive with high biodegradability and has rust removal and pickling functions.

Malic acid has the function of promoting the reducing function of the organic acid used, so it is most effective when mixed with citric acid at a ratio of 2:1.

In the second mixing and stirring step, 50 parts by weight of sodium gluconate and 50 parts by weight of sodium caprylate are added to the mixed solution of the first mixing and dissolving step, and stirred at a speed of 25 RPM/min for 20 minutes to completely dissolve them.

Sodium gluconate is a food additive with high biodegradability. It has a chelating action, forms a chelate with free metal ions, and has good anti-corrosion properties for ferrous and non-ferrous metals. If less than the amount used in manufacturing is used, rust prevention is weak, and if more is used, rust removal ability is lowered.

Sodium caprylate has good anti-corrosive properties for ferrous metals and acts as a stabilizer when forming a water-soluble film on the metal surface. It is uneconomical when used in an appropriate amount.

In the third mixing and stirring step (S30), 20 to 50 parts by weight of polyvinyl alcohol and 20 to 50 parts by weight of polysorbate (80) are added to the mixed solution produced in the second mixing and stirring step, and the temperature of the stirrer is set to 40 degrees Celsius (+/- 3) Also, stir at 50 RPM/min for 40 minutes to make a mixed solution.

Polyvinyl alcohol is a water-soluble polymer that has good biodegradability and is a base material that forms a film on a metal surface. When used in an appropriate amount, polyvinyl alcohol causes drying problems when forming a film after use.

Polysorbate 80 forms a water-soluble rust-preventive film together with polyvinyl and has a good effect on preventing non-ferrous metals from rusting. It is possible to stably create polyvinyl alcohol and a water-soluble rust-preventive film only when an appropriate amount is used.

When used in a ratio of 1:1 with polyvinyl alcohol, it forms an optimal anti-rust film.

Each sample was prepared as follows to measure the rust removal ability, rust prevention test, and biodegradability according to the composition ratio of the vaporizable rust inhibitor prepared according to the present invention.

sample 1

200 parts by weight of glycolic acid, 50 parts by weight of citric acid, and 25 parts by weight of malic acid were added to 1000 parts by weight of distilled water and mixed for 20 minutes at 25 RPM/min at room temperature using an agitator to make a first mixed solution, followed by 30 parts by weight of sodium gluconate, Add 30 parts by weight of sodium caprylate and mix again at 25 RPM/min for 20 minutes to make a second mixed solution. A sample solution was prepared by adding 20 parts by weight of polyvinyl alcohol and 20 parts by weight of polysorbate (80) to the solution and stirring at 50 RPM/min for 40 minutes.

sample 2

200 parts by weight of glycolic acid, 100 parts by weight of citric acid, and 50 parts by weight of malic acid were added to 1000 parts by weight of distilled water and mixed at room temperature at 25 RPM/min for 20 minutes using an agitator to make a first mixed solution, and then 50 parts by weight of sodium gluconate, Add 50 parts by weight of sodium caprylate and mix again at 25 RPM/min for 20 minutes to make a second mixed solution. A sample solution was prepared by adding 50 parts by weight of polyvinyl alcohol and 50 parts by weight of polysorbate (80) to the solution and stirring at 50 RPM/min for 40 minutes.

sample 3

Add 200 parts by weight of glycolic acid, 100 parts by weight of citric acid, and 50 parts by weight of malic acid to 1000 parts by weight of distilled water and mix for 20 minutes at 25 RPM/min at room temperature using an agitator to make a first mixed solution, 50 parts by weight of sodium gluconate, Add 50 parts by weight of sodium caprylate and mix again at 25 RPM/min for 20 minutes to prepare a second mixed solution. 20 parts by weight of polyvinyl alcohol and 20 parts by weight of polysorbate (80) were added to the solution and stirred at 50 RPM/min for 40 minutes to prepare a sample solution.

sample 4

200 parts by weight of glycolic acid, 100 parts by weight of citric acid, and 50 parts by weight of malic acid were added to 1000 parts by weight of distilled water and mixed at room temperature at 25 RPM/min for 20 minutes using a stirrer to make a first mixed solution, followed by 40 parts by weight of sodium gluconate, Add 40 parts by weight of sodium caprylate and mix again at 25 RPM/min for 20 minutes to make a second mixed solution. 30 parts by weight of polyvinyl alcohol and 30 parts by weight of polysorbate (80) were added to the solution and stirred at 50 RPM/min for 40 minutes to prepare a sample solution.

sample 5

Add 150 parts by weight of glycolic acid, 60 parts by weight of citric acid, and 30 parts by weight of malic acid to 1000 parts by weight of distilled water and mix for 20 minutes at 25 RPM/min at room temperature using an agitator to make a first mixed solution, then 30 parts by weight of sodium gluconate, Add 30 parts by weight of sodium caprylate and mix again at 25 RPM/min for 20 minutes to make a second mixed solution. 40 parts by weight of polyvinyl alcohol and 40 parts by weight of polysorbate (80) were added to the solution and stirred at 50 RPM/min for 40 minutes to prepare a sample solution.

Metal surface observation test after rust removal

After removing the rust of the metal specimen using the above 5 mixture samples, the metal surface was observed under a microscope.

Test metal specimen: QQ-S-698 carbon steel (5X7.5cm)

Rust generation procedure: After immersing the specimen in a 5% salt water solution, it is placed in a constant temperature bath at 40 degrees Celsius for 24 hours to generate rust.

Experimental procedure 1) By the rust generation procedure, the test specimens in which rust was formed were immersed in each sample solution for 20 minutes to remove rust, and then dried at room temperature for 30 minutes, and then the metal surface was observed under a microscope.

Table 1)

As a result of the experiment, it was confirmed that the rust on the metal surface was cleanly removed and there was no discoloration on the metal surface in all samples 1 to 5.

CONTACT TEST

Test specimen: QQ-S-698, T3 copper, LY12 aluminum,

Test specimen rust generation procedure: After immersing the specimen in a 5% salt water solution, rust is generated by placing the specimen in a constant temperature bath at 40 degrees Celsius for 24 hours.

Experimental procedure 1) By the rust generation procedure, the test specimens in which rust was formed were immersed in each sample solution for 20 minutes to remove rust, and then dried at room temperature for 30 minutes.

2) Put Lucite in a 500ml Test Jar, mount the prepared metal specimen on it, put 30ml of a 25% glycerin solution, and seal the Test Jar using a CAP.

3) Put the jar prepared in 4) in a thermostat at a temperature of 50 degrees Celsius and observe the corrosion state after 72 hours.

- Evaluation: The anti-corrosion effect is based on the requirements below.

Grades 0 to 2 are considered to have passed this test.

Grades 3 to 6 are considered test failures.

diagram 2)

As a result of the experiment, it can be seen that carbon steel and non-ferrous metals such as copper and aluminum have good anti-rust effects.

biodegradability experiment

The biochemical degradability of the rust remover prepared as a sample was measured by the KS/ISO/7827:1994 (2018 CONFIRMED) method.

Test method: KS/ISO/7827:1994 (2018 CONFIRMED)

Incubation temperature: (23+/-2) degrees Celsius

Analysis equipment: TOC ANALYSER (total organic carbon analyzer)

Analysis period: 21 days

[Table 3]

As a result of the above experiment, samples 1, 2, 3, 4, and 5 all confirmed a high biodegradation rate of 93% or more.

Claims (3)

The mixed medicine is 100 to 200 parts by weight of distilled water, 100 to 200 parts by weight of glycolic acid, 50 to 100 parts by weight of citric acid, 25 to 50 parts by weight of malic acid, 30 to 50 parts by weight of sodium gluconate, 30 to 50 parts by weight of sodium caprylate, A method for manufacturing an eco-friendly rust remover with anti-rust function, characterized in that it consists of 20 to 50 parts by weight of polyvinyl alcohol, polysorbate (80), and 20 to 50 parts by weight. The method of manufacturing an eco-friendly rust remover having a rust-preventive function, characterized in that citric acid and malic acid are used in a mixing ratio of 2:1 to promote the rust removal effect in claim 1. In order to form a water-soluble film on the metal surface to maintain rust prevention, polyvinyl alcohol and polysorbate (80) are mixed at a ratio of 2 to 4%, and the mixing ratio of polyvinyl and polysorbate (80) is 1: 1 Method for manufacturing an eco-friendly rust remover having a rust-preventing function, characterized in that.