KR102613684B1 - Composition of Long Life Antifreezing Liquid and Manufacturing Method Of It - Google Patents

Abstract

The present invention relates to long life antifreeze compositions.
The method for producing a long-life antifreeze composition of the present invention includes 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and water in an amount of 0.2 to 2 times the combined weight of the above raw materials. A primary mixing step of preparing a primary mixture by putting it into the stirrer and stirring it while maintaining the internal temperature of the stirrer at 80 to 100°C for 6 to 24 hours; 4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and the remaining amount of ethylene glycol are mixed and placed inside a separate stirrer, then stirred inside the stirrer. A secondary mixing step of preparing a secondary mixture by stirring while maintaining the temperature at 75 to 85°C for 6 to 12 hours; It includes a tertiary mixing step of mixing the primary mixture and the secondary mixture and maturing them at room temperature for 24 to 48 hours to prepare an antifreeze composition.
According to the present invention, a long-life antifreeze composition is provided that can prevent freezing and prevent corrosion without generating deposits.

Description

Long life antifreeze composition and manufacturing method thereof {Composition of Long Life Antifreezing Liquid and Manufacturing Method Of It}

The present invention relates to antifreeze and a method for producing the same.

Conventional antifreeze compositions include, for example, “Inhibited antifreeze composition” (US Patent No. 3,362,910, Patent Document 1), “Inhibited single-phase anti-freeze formulations and method” (US Patent No. 3,282,946, Patent Document 2), etc. As described, these compositions include phosphoric acid and its salts, silicates, nitrates, nitrites, benzoates, mecaptobenzothiazole salts, toritriazole salts, triethanolamine, morpholine, tributyl phosphate, etc. as additives.

However, the effect of using these additives is only for the purpose of preventing corrosion of various metal materials, including aluminum and cast iron, and among the additives, amine and sodium nitrite are said to form nitrosamine, a carcinogenic substance, when used simultaneously. Because there are reports, its use is regulated.

In addition, silicates precipitate during long-term storage and operation, which reduces the function of the cooling system, so it is necessary to use a separate stabilizer.

Carboxyl-based stabilizers have been proposed as such stabilizers, but these stabilizers have the problem of not suppressing the interaction between calcium and silicate for a long time under high temperature and high pressure conditions.

A silicate stabilizer was also proposed as a stabilizer, but although it had excellent long-term storage stability, it had the problem of insufficient stability at high temperature and high pressure.

US 3,362,910 (1968.01.09) US 3,282,846 (1966.11.01)

The long-life antifreeze composition and method for producing the same of the present invention are intended to solve the problems occurring in the above-described prior art, and are intended to provide a long-life antifreeze composition that can prevent freezing and corrosion without generating deposits.

In order to solve the above-described problems, the method for producing a long-life antifreeze composition of the present invention includes 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and the combined weight of the above raw materials. A primary mixing step of preparing a primary mixture by adding 0.2 to 2 times the weight of water into the stirrer and stirring it while maintaining the internal temperature of the stirrer at 80 to 100°C for 6 to 24 hours; 4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and the remaining amount of ethylene glycol are mixed and placed inside a separate stirrer, then stirred inside the stirrer. A secondary mixing step of preparing a secondary mixture by stirring while maintaining the temperature at 75 to 85°C for 6 to 12 hours; It includes a tertiary mixing step of mixing the primary mixture and the secondary mixture and maturing them at room temperature for 24 to 48 hours to prepare an antifreeze composition.

Alternatively, 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 0.2 to 10 times the weight of the combined weight of the above raw materials are added into the stirrer, and then added to the stirrer. A primary mixing step of preparing a primary mixture by stirring while maintaining the internal temperature at 80 to 100°C for 6 to 24 hours; After preparing a slurry by mixing 4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and 5 to 15% by weight of ethylene glycol, A granule manufacturing step of manufacturing granules by spraying the slurry at high pressure into a granulator maintained at a temperature of 100 to 120°C; A secondary mixing step of preparing a secondary mixture by adding the granules and the remaining amount of ethylene glycol into a separate stirrer and stirring while maintaining the internal temperature of the stirrer at 75 to 85°C for 6 to 12 hours; It includes a tertiary mixing step of mixing the primary mixture and the secondary mixture and maturing them at room temperature for 24 to 48 hours to prepare an antifreeze composition.

In the above configuration, 1 to 2% by weight of shungite powder is further added when producing slurry in the granule production step.

Alternatively, 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 0.2 to 10 times the weight of the combined weight of the above raw materials are added into the stirrer, and then added to the stirrer. A primary mixing step of preparing a primary mixture by stirring while maintaining the internal temperature at 80 to 100°C for 6 to 24 hours; After preparing a slurry by mixing 4.5 to 5.5% by weight of sodium metasilicate, 1 to 2% by weight of shungite powder, and 5 to 15% by weight of ethylene glycol, the slurry was placed in a granulator maintained at an internal temperature of 100 to 120°C. A granule manufacturing step of manufacturing granules by spraying at high pressure; After adding 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, the remaining amount of ethylene glycol, and the above granules into a separate stirrer, the temperature inside the stirrer was adjusted to 75 to 85°C. A secondary mixing step of preparing a secondary mixture by stirring and maintaining for ~12 hours; It includes a tertiary mixing step of mixing the primary mixture and the secondary mixture and maturing them at room temperature for 24 to 48 hours to prepare an antifreeze composition.

The long-life antifreeze composition of the present invention is characterized in that it is manufactured by the above production method.

According to the present invention, a long-life antifreeze composition is provided that can prevent freezing and prevent corrosion without generating deposits.

Figure 1 is an excerpt of a report showing the results of a test agency analysis request for the long-life antifreeze composition of the present invention.

Hereinafter, the long-life antifreeze composition of the present invention and its manufacturing method will be described in detail.

The long-life antifreeze composition of the present invention consists of ethylene glycol as the main ingredient, and the additives include sodium metasilicate, sodium hydroxide, sodium benzoate, potassium nitrate, boric acid, triethanolamine, and sodium molybdate, and may further include shungite. .

Ethylene glycol, the main component of the present invention, plays a role in preventing freezing of the engine or coolant and damage caused by freezing, and the ethylene glycol is preferably contained in approximately 50 to 85% by weight of the total content of the coolant antifreeze. do.

If the content of ethylene glycol is less than 50% by weight, it may cause a slowdown in the cooling effect and overheat phenomenon due to a lowering of the boiling point in an environment where the outdoor temperature is high, and if it exceeds 85% by weight, it may cause a relatively different Due to a decrease in the amount of coolant antifreeze composition used, problems may arise in which the effect of preventing damage due to freezing and freezing or the ability to prevent corrosion is reduced.

Sodium metasilicate, the main ingredient of the additive, is a type of silicate.

Silicates added to antifreeze compositions containing ethylene glycol as a main ingredient form a protective film on the metal surface and prevent corrosion, thereby extending the life of the engine and cooling system. They also help particles in the antifreeze to be evenly dispersed and prevent the formation of deposits, thereby protecting the antifreeze. This has the effect of improving filtering performance and increasing overall liquidity.

Additionally, it contributes to improving acidity by neutralizing acidic substances in antifreeze.

However, the solubility may change depending on the chemical balance that affects the solubility of silicate, and in this case, there is a problem in that the stability and performance of the antifreeze change.

In addition, if the additive content is too high, the viscosity of the antifreeze may increase and precipitates may form, which may deteriorate the performance of the antifreeze.

For this reason, the silicate content in antifreeze is typically in the range of 0.1 to 2% by weight.

Meanwhile, silicates include sodium silicate nitrate, sodium silicate, and sodium metasilicate.

The present invention is characterized by using sodium metasilicate among various silicates, and unlike the prior art, it is characterized in that it is contained in a large amount such that its content is 4.5 to 5.5% by weight of the total content of the antifreeze composition.

As mentioned above, if a large amount of sodium metasilicate is contained, the viscosity increases and precipitates are generated.

However, sodium metasilicate has the advantage of being easy to handle and manufacture due to its excellent solubility and high stability compared to other silicates.

This sodium metasilicate is preferably used in approximately 5% by weight of the total content of the antifreeze composition.

Sodium benzoate, one of the additive ingredients, is formulated with phosphate and has been mainly used to prevent corrosion of iron and aluminum-based metals and to suppress cavitation damage.

Sodium benzoate and phosphate can be included together in antifreeze formulations because their functions are complementary and do not interfere with each other's performance.

However, sodium benzoate reacts with silicate (sodium silicate) to form a gel-like substance, which can actually reduce the corrosion prevention function. Therefore, when silicate is included as an additive raw material, sodium benzoate is generally excluded.

On the other hand, if bubbles are generated while the coolant antifreeze circulates through the cooling system, heat transfer may be interrupted and cavitation corrosion may occur. To prevent this, a defoaming agent is usually included, and the defoaming agent is a silicone emulsion or 1,2- Propanediol, 1,2-glycol, etc. have been used.

While the inventor of this application was actively trying to utilize sodium metasilicate, which is easy to handle, he discovered that when sodium benzoate is added in a larger amount than the normal antifreeze production content, it lowers the surface tension of the antifreeze and decomposes the foam, so he used sodium metasilicate. It was possible to prevent the problems of excessive use of , so it was used.

Accordingly, the appropriate content of sodium benzoate is approximately 4.5 to 5.5% by weight based on the entire antifreeze composition.

Meanwhile, during the manufacturing process, if sodium benzoate and sodium metasilicate are mixed at the same time, the ability to suppress foaming is reduced. Sodium benzoate, potassium nitrate, and sodium molybdate are mixed in advance, and sodium metasilicate is mixed with ethylene glycol and other additives. It is preferable to mix in a standing state.

Potassium nitrate, the main raw material of the additive in the present invention, helps inhibit or slow down corrosion by forming a protective layer on the metal surface.

It also helps lower the freezing point of antifreeze so that it remains in a liquid state at low temperatures.

Potassium nitrate not only provides a certain level of corrosion protection for non-ferrous metals such as aluminum, copper, and brass, but also has a corrosion prevention function for steel and cast iron alloys.

At this time, potassium nitrate is preferably contained in an amount of 4 to 5% by weight based on the total antifreeze composition.

If the content is less than the minimum content, the corrosion prevention effect is minimal, and if the content exceeds the maximum content, corrosion of non-ferrous metals such as aluminum and copper may be accelerated.

This is because the non-ferrous metal is sensitive to nitrate concentration.

In addition, potassium nitrate can affect the incorporation of air into antifreeze, increasing the amount of foam and affecting pH.

Triethanolamine, the main raw material of the additive in the present invention, functions as a pH buffer and corrosion inhibitor in antifreeze formulations.

For this purpose, triethanolamine is preferably contained in an amount of 2.5 to 3.5% by weight based on the total antifreeze composition.

If this triethanol content is used in excessive amounts, the pH may increase significantly.

High pH can cause chemical incompatibility with other components in antifreeze and cause problems such as large amounts of sediment being generated.

Sodium hydroxide, one of the additive components of the present invention, is a strong basic substance and plays a role in controlling the pH of the antifreeze composition.

It is preferable that sodium hydroxide is contained in an amount of approximately 0.5 to 1.5% by weight based on the total composition.

Boric acid, one of the additive components of the present invention, has excellent corrosion prevention function for cast iron, etc.

However, boric acid has the problem of corroding aluminum when used excessively, so in the present invention, it is preferable that boric acid is contained in an amount of 0.5 to 1.5% by weight in the composition.

Molybdenum soda, which is one of the additive components of the present invention, serves as a corrosion inhibitor for ferrous metals and protects iron, steel, cast iron, etc.

In particular, it forms a passivation layer on the metal surface to prevent corrosion by protecting against water, oxygen and other contaminants.

In particular, sodium molybdate maximizes the anti-corrosion function when used together with the boric acid and potassium nitrate mentioned above.

In the present invention, molybdenum soda is preferably contained in an amount of 0.25 to 0.75% by weight of the total content of the composition.

Hereinafter, the method for producing the long-life antifreeze composition of the present invention will be described in detail.

The manufacturing method of the present invention basically consists of a first mixing step, a second mixing step, and a third mixing step, and in some cases, a granulation step may be further performed prior to the second mixing step.

Below, an example of the manufacturing process is described.

<First mixing step>

After adding 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 0.2 to 2 times the weight of the combined weight of the above raw materials into the stirrer, the internal temperature of the stirrer Prepare the primary mixture by stirring while maintaining the temperature at 80 to 100°C for 6 to 24 hours.

Potassium nitrate, molybdenum soda, and sodium benzoate do not dissolve well in ethylene glycol, so they are dissolved in water at the appropriate temperature and then dispersed while dissolved in water in the third mixing step.

<Second mixing step>

4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and the remaining amount of ethylene glycol are mixed and placed inside a separate stirrer, then stirred inside the stirrer. Prepare a secondary mixture by stirring while maintaining the temperature at 75 to 85°C for 6 to 12 hours.

<Third mixing step>

An antifreeze composition is prepared by mixing the primary mixture and the secondary mixture and aging at room temperature for 24 to 48 hours.

As described above, it is divided into a first mixing step and a second mixing step, and as the materials and their contents mixed in each mixing step are limited, it has the following characteristics.

More specifically, the primary mixture forms a protective layer on metal surfaces within the cooling system, improving corrosion prevention and extending the life of system components.

In particular, sodium benzoate and potassium nitrate serve as buffers to maintain the pH level in antifreeze, contributing to corrosion prevention and improving the stability of antifreeze.

Additionally, potassium nitrate lowers the freezing point of antifreeze, allowing it to remain liquid at a lower temperature and prevent freezing.

In the above configuration, it is possible to have a granule manufacturing step for manufacturing granules before the secondary mixing step.

Below, another example of a manufacturing process equipped with a granule manufacturing step will be described.

<First mixing step>

After adding 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 0.2 to 10 times the weight of the combined weight of the above raw materials into the stirrer, the internal temperature of the stirrer Prepare the primary mixture by stirring while maintaining the temperature at 80 to 100°C for 6 to 24 hours.

<Granule manufacturing step>

After preparing a slurry by mixing 4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and 5 to 15% by weight of ethylene glycol, Granules are produced by spraying the slurry at high pressure into a granulator maintained at a temperature of 100 to 120°C.

At this time, when preparing the slurry, 1 to 2% by weight of shungite powder may be added.

Shungite is a mineral sourced from the Synga region of Karelia, Russia, and its main ingredients are silicate and fullerene, where fullerene refers to natural fullerene.

Depending on the fullerene content in Sungite, Sungite is divided into Normal Sungite and Elite Sungite.

Fullerene, which is contained in large quantities in shungite, is a carbon allotrope like graphite or diamond, but because it has a structural form different from graphite or diamond, it is called the third carbon allotrope.

Fullerenes have carbon rings in which carbon (C) atoms are arranged in a pentagonal or hexagonal shape, and these carbon rings are combined in a roughly spherical shape to form a hollow space.

It is known that fullerene has the function of purifying pollutants.

However, nothing is known about using fullerene as an antifreeze raw material.

The applicant applied the shungite powder collected by chance to the granulation process and confirmed that the viscosity control of antifreeze and pH control of sodium metasilicate were more effective, and longer lifespan was secured.

<Second mixing step>

The granules and the remaining amount of ethylene glycol are placed inside a separate stirrer, and then stirred while maintaining the internal temperature of the stirrer at 75 to 85°C for 6 to 12 hours to prepare a secondary mixture.

<Third mixing step>

An antifreeze composition is prepared by mixing the primary mixture and the secondary mixture and aging at room temperature for 24 to 48 hours.

In the above configuration, the granule manufacturing step can be carried out using only sodium metasilicate, shungite, and a small amount of ethylene glycol.

Below, this process is described.

<First mixing step>

After adding 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 0.2 to 10 times the weight of the combined weight of the above raw materials into the stirrer, the internal temperature of the stirrer Prepare the primary mixture by stirring while maintaining the temperature at 80 to 100°C for 6 to 24 hours.

<Granule manufacturing step>

After preparing a slurry by mixing 4.5 to 5.5% by weight of sodium metasilicate, 1 to 2% by weight of shungite powder, and 5 to 15% by weight of ethylene glycol, the slurry was placed in a granulator maintained at an internal temperature of 100 to 120°C. Granules are produced by spraying at high pressure.

<Second mixing step>

After adding 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, the remaining amount of ethylene glycol, and the above granules into a separate stirrer, the temperature inside the stirrer was adjusted to 75 to 85°C. Prepare a secondary mixture by stirring and maintaining for ~12 hours.

<Third mixing step>

An antifreeze composition is prepared by mixing the primary mixture and the secondary mixture and aging at room temperature for 24 to 48 hours.

Hereinafter, embodiments of the present invention will be described.

<Example 1>

Add 4.5% by weight of potassium nitrate, 5% by weight of sodium benzoate, 0.5% by weight of molybdenum soda, and 5% by weight of purified water into the stirrer, then stir while maintaining the internal temperature of the stirrer at 90°C for 6 hours to prepare the primary mixture. did.

5% by weight of sodium metasilicate, 1% by weight of sodium hydroxide, 1% by weight of boric acid, 3% by weight of triethanolamine, and the remaining amount of ethylene glycol were mixed and placed inside a separate stirrer, and the internal temperature of the stirrer was set at 80°C for 12 hours. A secondary mixture was prepared by maintaining and stirring.

An antifreeze composition was prepared by mixing the primary mixture and the secondary mixture and aging them at room temperature for 24 hours.

<Example 2>

Add 4.5% by weight of potassium nitrate, 5% by weight of sodium benzoate, 0.5% by weight of molybdenum soda, and 5% by weight of purified water into the stirrer, then stir while maintaining the internal temperature of the stirrer at 90°C for 6 hours to prepare the primary mixture. did.

After preparing a slurry by mixing 5% by weight of sodium metasilicate, 1% by weight of sodium hydroxide, 1% by weight of boric acid, 3% by weight of triethanolamine, and 10% by weight of ethylene glycol, the slurry was placed in a granulator maintained at an internal temperature of 100°C. Granules were prepared by spraying at high pressure.

delete

Then, the granules and the remaining amount of ethylene glycol were added into a separate stirrer and stirred while maintaining the internal temperature of the stirrer at 80°C for 12 hours to prepare a secondary mixture.

An antifreeze composition was prepared by mixing the primary mixture and the secondary mixture and aging them at room temperature for 24 hours.

<Examples 3 to 5>

Proceed in the same manner as in Example 2, but when preparing the slurry, 0.5% by weight, 1% by weight, and 2.5% by weight of shungite powder were added, respectively, and when preparing the secondary mixture, the remaining amount was adjusted with ethylene glycol to obtain the antifreeze of Examples 3 to 5. A composition was prepared.

<Examples 6 to 8>

Add 4.5% by weight of potassium nitrate, 5% by weight of sodium benzoate, 0.5% by weight of molybdenum soda, and 5% by weight of purified water into the stirrer, then stir while maintaining the internal temperature of the stirrer at 90°C for 6 hours to prepare the primary mixture. did.

A slurry is prepared by mixing 5% by weight of sodium metasilicate powder, shungite powder, and 6% by weight of ethylene glycol, and then the slurry is sprayed at high pressure into a granulator maintained at an internal temperature of 100°C to prepare granules.

At this time, 0.5% by weight (Example 6), 1% by weight (Example 7), and 2.5% by weight (Example 8) of shungite powder were added for each example.

Then, 1% by weight of sodium hydroxide, 1% by weight of boric acid, 3% by weight of triethanolamine, the remaining amount of ethylene glycol, and the above granules were placed inside a separate stirrer, and then stirred while maintaining the internal temperature of the stirrer at 80°C for 12 hours. A secondary mixture was prepared.

An antifreeze composition was prepared by mixing the primary mixture and the secondary mixture and aging them at room temperature for 24 hours.

Hereinafter, a comparative example for comparison with the above example will be described.

<Comparative Examples 1 to 10>

It was prepared in the same manner as in Example 1, but with the contents shown in Table 1 below.

A B C D E F G H I Comparative Example 1 3.5 5 0.5 5 5 One One 3 76 Comparative example 2 5.5 5 0.5 5 5 One One 3 74 Comparative example 3 5 4 0.5 5 5 One One 3 75 Comparative example 4 5 6 0.5 5 5 One One 3 73 Comparative Example 5 5 5 0.2 5 5 One One 3 74.3 Comparative Example 6 5 5 0.8 5 5 One One 3 73.7 Comparative example 7 5 5 0.5 5 4 One One 3 75 Comparative example 8 5 5 0.5 5 6 One One 3 73 Comparative Example 9 5 5 0.5 5 5 One One 2 75 Comparative Example 10 5 5 0.5 5 5 One One 4 73

(A: Potassium nitrate, B: Sodium benzoate, C: Molybdenum soda, D: Water, E: Sodium metasilicate, F: Sodium hydroxide, G: Boric acid, H: Triethanolamine, I: Ethylene glycol)

<Comparative Example 11>

Comparative Example 11 was prepared by mixing all raw materials at once in the same amount as in Example 1.

Hereinafter, an experimental example of the present invention will be described.

<Experimental Example 1> Corrosivity evaluation experiment

Copper, cast iron, aluminum, and steel metal specimens were added to the compositions of the examples and comparative examples, and set at 98°C to accelerate deterioration, and allowed to elapse for 3 weeks.

The specimen was used with a width and height of 2 cm and a thickness of 0.2 cm, and the amount removed due to corrosion of the base material was measured by weight loss measurement and is shown in Tables 2 to 4 below.

The corrosion rate was measured in the following manner.

Corrosion rate (%) = (Weight of specimen before experiment - Weight of specimen after experiment)/Weight of specimen after experiment ×100

<Corrosion rate of copper samples> Psalter Corrosion rate (%) Psalter Corrosion rate (%) Example 1 5.42×10 ^-3 Comparative Example 1 7.84×10 ^-3 Example 2 5.88×10 ^-3 Comparative example 2 6.24×10 ^-3 Example 3 5.84×10 ^-3 Comparative example 3 6.67×10 ^-3 Example 4 4.82×10 ^-3 Comparative example 4 8.52×10 ^-3 Example 5 5.67×10 ^-3 Comparative Example 5 7.12×10 ^-3 Example 6 5.43×10 ^-3 Comparative Example 6 7.24×10 ^-3 Example 7 4.02×10 ^-3 Comparative example 7 6.32×10 ^-3 Example 8 5.42×10 ^-3 Comparative example 8 7.74×10 ^-3 - Comparative Example 9 6.88×10 ^-3 - Comparative Example 10 6.78×10 ^-3 - Comparative Example 11 7.32×10 ^-3

<Corrosion rate of cast iron samples> Psalter Corrosion rate (%) Psalter Corrosion rate (%) Example 1 5.53×10 ^-3 Comparative Example 1 7.24×10 ^-3 Example 2 5.72×10 ^-3 Comparative example 2 7.32×10 ^-3 Example 3 5.17×10 ^-3 Comparative example 3 8.24×10 ^-3 Example 4 4.51×10 ^-3 Comparative example 4 8.87×10 ^-3 Example 5 5.42×10 ^-3 Comparative Example 5 7.52×10 ^-3 Example 6 5.17×10 ^-3 Comparative Example 6 7.79×10 ^-3 Example 7 4.24×10 ^-3 Comparative Example 7 7.31×10 ^-3 Example 8 5.51×10 ^-3 Comparative example 8 7.07×10 ^-3 - Comparative Example 9 7.74×10 ^-3 - Comparative Example 10 7.29×10 ^-3 - Comparative Example 11 7.67×10 ^-3

<Corrosion rate of aluminum samples> Psalter Corrosion rate (%) Psalter Corrosion rate (%) Example 1 5.88×10 ^-3 Comparative Example 1 7.33×10 ^-3 Example 2 5.74×10 ^-3 Comparative example 2 7.52×10 ^-3 Example 3 5.02×10 ^-3 Comparative Example 3 8.87×10 ^-3 Example 4 4.21×10 ^-3 Comparative example 4 9.21×10 ^-3 Example 5 5.33×10 ^-3 Comparative Example 5 8.12×10 ^-3 Example 6 5.13×10 ^-3 Comparative Example 6 7.79×10 ^-3 Example 7 3.24×10 ^-3 Comparative example 7 8.32×10 ^-3 Example 8 5.25×10 ^-3 Comparative example 8 7.41×10 ^-3 - Comparative Example 9 7.67×10 ^-3 - Comparative Example 10 7.88×10 ^-3 - Comparative Example 11 7.25×10 ^-3

<Corrosion rate of steel samples> Psalter Corrosion rate (%) Psalter Corrosion rate (%) Example 1 5.92×10 ^-3 Comparative Example 1 7.33×10 ^-3 Example 2 5.88×10 ^-3 Comparative example 2 7.42×10 ^-3 Example 3 5.33×10 ^-3 Comparative Example 3 9.42×10 ^-3 Example 4 4.33×10 ^-3 Comparative Example 4 9.67×10 ^-3 Example 5 5.24×10 ^-3 Comparative Example 5 7.62×10 ^-3 Example 6 5.17×10 ^-3 Comparative Example 6 8.17×10 ^-3 Example 7 3.77×10 ^-3 Comparative example 7 7.88×10 ^-3 Example 8 5.49×10 ^-3 Comparative example 8 7.46×10 ^-3 - Comparative Example 9 8.10×10 ^-3 - Comparative Example 10 7.79×10 ^-3 - Comparative Example 11 7.64×10 ^-3

As a result of the above experiments, it can be seen that the corrosion rates of the Examples for copper, aluminum, cast iron, and steel are much lower than those of the Comparative Example.

<Experimental Example 2> Sediment generation measurement experiment

After taking 50 ml of the antifreeze prepared in the above examples and comparative examples, it was placed in a 100 ml beaker, and then 100 ppm of FeCl ₃ was added to make 100 ml of 50% by volume tap water solution.

After the tap water solution was left in a place exposed to indoor lighting and indirect sunlight for 20 days, the left tap water solution was centrifuged at 2000 rpm for 10 minutes according to the KS M 2069 method to measure the volume of sediment. The results are as follows. It is shown in Table 6.

division
(Sediment volume %) exam time 5 days 10 days 20th



Example One 0.0 0.0 0.00 2 0.0 0.01 0.02 3 0.0 0.01 0.02 4 0.0 0.00 0.01 5 0.0 0.0 0.01 6 0.0 0.01 0.02 7 0.0 0.0 0.01 8 0.0 0.01 0.02





Comparative example
One 0.06 0.34 0.75 2 0.06 0.27 0.54 3 0.02 0.42 0.88 4 0.01 0.11 0.21 5 0.03 0.31 0.62 6 0.01 0.04 0.09 7 0.0 0.06 0.12 8 0.09 0.67 1.12 9 0.0 0.03 0.08 10 0.03 0.17 0.32 11 0.0 0.13 0.24

As a result of the above experiment, it can be seen that the Examples generate significantly less sediment than the Comparative Examples.

The antifreeze composition of Example 1 was requested to be tested and analyzed by the Korea Testing and Research Institute for items such as liquid state, freezing point, pH, corrosiveness, and specific gravity, and the results are shown in Figures 2 to 4.

As shown in the figure, the antifreeze composition was found to meet all criteria.

Claims (5)

In the method for producing an antifreeze composition,
Based on 100% by weight of the total antifreeze composition, 4 to 5% by weight of potassium nitrate, 4.5 to 5.5% by weight of sodium benzoate, 0.25 to 0.75% by weight of molybdenum soda, and 1.75 to 22.5% by weight of water are added into the stirrer, A primary mixing step of preparing a primary mixture by stirring while maintaining the internal temperature of the stirrer at 80 to 100°C for 6 to 24 hours;
Based on 100% by weight of the total antifreeze composition, 4.5 to 5.5% by weight of sodium metasilicate, 0.5 to 1.5% by weight of sodium hydroxide, 0.5 to 1.5% by weight of boric acid, 2.5 to 3.5% by weight of triethanolamine, and A secondary mixing step of mixing 54.25 to 81.5% by weight of ethylene glycol and adding it into a separate stirrer, then stirring while maintaining the internal temperature of the stirrer at 75 to 85°C for 6 to 12 hours to prepare a secondary mixture;
A tertiary mixing step of mixing the primary mixture and the secondary mixture and then aging at room temperature for 24 to 48 hours to prepare an antifreeze composition,
Method for producing a long-life antifreeze composition.
delete delete delete In the antifreeze composition,
Characterized in that it is manufactured by the manufacturing method of claim 1,
Long-life antifreeze composition.