RU2263131C1 - Antifreeze concentrate - Google Patents

Abstract

FIELD: chemical technology, antifreezes.

SUBSTANCE: invention relates to antifreeze concentrates used in cooling system of internal combustion motors and as heat-carriers in heat-exchange devices. Antifreeze concentrate comprises the following components, wt.-%: mixture of alkaline metal salts of adipic or succinic, or sebacic, or benzoic, or 2-ethylhexanoic acids taken in any combination, 0.005-60.0; sodium molybdate, 0.01-10.0 benzotriazole or tolyltriazole, or their mixture taken in equal ratios, 0.001-5.0; alkaline metal salt of 2-mercaptobenzthiazole (Captax), 0.005-1.2; caprolactam, 0.001-1.5; sodium polyacrylate, 0.001-3.0; water, 5.0-15.0; ethylene glycol or propylene glycol, or polyglycols, the balance. Invention provides improving exploitation properties of antifreeze and its stability in storage at high temperatures.

EFFECT: improved and valuable properties of antifreeze.

2 cl, 4 tbl, 34 ex

Description

The invention relates to the field of chemical technology, in particular to antifreeze concentrates, for the manufacture of coolants used in cooling systems of internal combustion engines of cars, and also as a coolant intended for use in heating and air conditioning systems of buildings.

Known compositions of antifreeze concentrates (CS patent No. 226394, IPC, 6, C 23, F 11/10, 1985; YP patent 59157167, IPC, 6, 09, K 3/00, 1984), which do not prevent the corrosion of ferrous metals . Antifreeze, made on the basis of a ferrous metal inhibitor (CS patent No. 213154, IPC, 6, C 23, F 11/10, 1984), is aggressive towards brass.

A known glycol-based antifreeze concentrate (FR application No. 2489355, IPC, 6, C 09, K 15/04, 1982). Although it prevents corrosion of ferrous and non-ferrous metals, however, the antifreeze obtained on its basis is unstable with respect to hard water.

Known corrosion inhibitors, which are a concentrate of antifreezes (RU patent No. 2046815, IPC, 6, 09, K 5/00, 1995; RU patent No. 2050397, IPC, 6, 09, K 5/00, 1995; RU patent No. 2095388, IPC, 6, C 09, K 5/00, 1997), which provide protection for ferrous and non-ferrous metals, but containing sodium tetraborate (borax), the presence of which can impair the protection of aluminum and its alloys under heating conditions.

A highly concentrated superconcentrate for the production of antifreezes and coolants (RU patent No. 2196797, IPC, 7, C 09, K 5/00, 2001), on the basis of which antifreezes with improved anti-corrosion properties are made, as in previous inventions, has a significant drawback in that that triethanolamine is present in its composition. It is believed that such compounds can break down at high temperatures and lead to the formation of high molecular weight carcinogenic compounds, such as nitrosoamines, which are toxicologically hazardous.

Similar disadvantages preclude corrosion inhibitor compositions for glycol-based antifreezes (RU patent No. 2104330, IPC, 6, C 09, K 5/00, 1999; RU patent No. 2143499 IPC, 6, C 09, K 5/00, 1999; RU patent No. 2125074, IPC, 6, C 09, K 5/00, 1999). However, the presence of potassium phosphates in the compositions of these inventions reduces the stability of antifreeze during its operation, the reason for this is the formation of precipitation that interferes with the circulation of the coolant and thereby reduces heat transfer.

The phosphate-free corrosion inhibitor is known (US 5422026 MKI 6, C 09, K 5/00, 1995), which contains borax, nitrates and silicates, the presence of which is characterized by the precipitation of insoluble silicate modifications at high temperatures, which indicates the instability of antifreeze in general.

Known aqueous corrosion inhibitor (US patent No. 6228283, IPC 7, C 09, K 5/00, 2001), the composition of which is represented by stabilized silicate, however, the presence in it of alkali metal phosphates, nitrate and alkali metal nitrite does not allow such antifreezes to be recognized as relevant modern requirements for antifreeze.

A polyglycol-based coolant is known containing mono- and dicarboxylic acids, alkali metal phosphate sodium tetraborate, and / or high-modulus liquid glass, and / or Trilon B, and / or dextrin as anti-corrosion additives (Patent RF 2213149 C, 7, C 09 K 5/00, 2003). The presence of such components reduces the stability of the coolant as a whole. It is known that the presence of borax contributes to increased corrosion of aluminum, alkali metal phosphate does not provide a long-term protective film on the metal surface, and the inclusion of high-modulus liquid glass (sodium silicate) helps to reduce the stability of antifreeze during storage and the formation of a gel-like precipitate in operating conditions at high temperatures.

Known ethylene glycol-based antifreeze concentrate containing monocarboxylic acids of the following composition: alkali metal salt 6, 6 ', 6 "- (1, 3, 5-triazine-2, 4, 6-tril-triimino) -trihexanoic acid (0, 1 - 6.0 wt.%), Benzotriazole or tolyltriazole (0.02 - 2.0 wt.%), Magnesium nitrate (0.01 - 1.0 wt.%) (DE patent 19930682, IPC 7, C 09 , K 5/00, 2001) However, the antifreeze obtained on the basis of this concentrate, despite the high anticorrosion properties, is not available for domestic production due to the shortage of raw materials of this composition and the undesirable presence of nitrate.

The closest in composition, properties and purpose to the claimed composition of antifreeze concentrates is an antifreeze cooling concentrate and its variants of the following composition, wt.%:

Sodium or potassium salt

2-ethylhexanoic acid or mixtures thereof 2.4-3.3 wt.%

Sodium or potassium salt

neodecanoic acid or mixtures thereof 0.8-1.1 wt.%

Benzotriazole alkali metal salt

or tolyltriazole 0.2-0.5 wt.%

Sodium nitrate 0-0.26 wt.%

Alkali metal molybdate 0-0.51 wt.%

Borax 0-2.1 wt.%

Sodium salt of mercaptobenzthiazal 0-0.55 wt.%

Sodium silicate 0-0.33 wt.%

Sodium hydroxide 0.68-1.7 wt.%

Water 0.1-1.34 wt.%

Liquid alcohol (alkanols, or alkanediols, or

glycols, or glycerin) the rest

However, high anticorrosion protection of metals of this antifreeze is provided not only due to the presence of salts of monocarboxylic acids, but also due to the presence of borax, nitrate, silicate in its composition, the presence of which contradicts modern requirements of automakers (see Ford WSS-M97 B44D Engineering Materials Specification, where the presence of silicates, phosphates is limited to 0.001 wt.%, borax - 0.0005 wt.%; see Technical requirements of AvtoVAZ TTM 1.97.1172 - 2004, in which the presence of nitrate and nitrite is completely eliminated).

Antifreeze formulas with enhanced performance characteristics were further developed through the use of a selected combination of mono- and dicarboxylic acids and a number of other corrosion inhibitors. The composition of new modern antifreezes completely eliminates the presence of silicates, phosphates, nitrates and nitrites, amines, borates while maintaining high corrosion protection of metals, especially aluminum, steel, cast iron, solder, copper and brass.

The aim of this invention is to obtain antifreeze with high protective properties based on domestic raw materials that do not contain silicates, borates, phosphates, amines, nitrates, nitrites, which has increased stability when operating at high temperatures.

This goal is achieved in that a glycol-based antifreeze concentrate containing, as an inhibitory composition, a carefully selected combination of alkali metal salts from one to five mono- and dicarboxylic acids, such as adipic, succinic, sebacic, benzoic, 2-ethylhexanoic, in any of them combination and in any ratio, additionally contain benzotriazole or tolyltriazole, or their mixture in equal proportions, sodium molybdate, alkali metal salt of 2-mercaptobenzthiazole (captax), caprolactam, sodium polyacrylate, water, and as glycol - monoethylene glycol, or propylene glycol, or polyglycols with

the following ratio of components, wt.%:

Sodium or potassium salt

adipic acid, or

sodium or potassium salt

succinic acid, or

sodium or potassium salt of sebacic acid, or sodium or potassium salt

benzoic acid, or

sodium or potassium salt

2-ethylhexanoic acid, or a mixture thereof

in any combination and in any ratio of 0.005-60.0

Sodium molybdate 0.01-10.0

Benzotriazole or tolyltriazole, or

their mixture in equal proportions of 0.001-5.0

Sodium or potassium salt

2-mercaptobenzthiazole (captax) 0.005-1.2

Caprolactam 0.001-1.5

Sodium Polyacrylate (Medium Molecular

mass 8000 g / mol) 0.001-3.0

Water 5.0-15.0

Monoethylene glycol, or propylene glycol, or

Polyglycols the rest

Moreover, as a specified anti-corrosion composition of alkali metal salts of mono- and dicarboxylic acids, their mixture can be used in the following ratio of components, wt.%: 0.01-10.0 sodium or potassium salt of adipic acid, or 0.01-10, 0 sodium or potassium salt of succinic acid, or 0.01-10.0 sodium or potassium salt of sebacic acid, or 0.005-10.0 sodium or potassium salt of benzoic acid, or 0.005-20.0 sodium or potassium salt of 2-ethylhexanoic acid , or their mixture in any combination and in any ratio.

At the same time, polyglycols (TU 6-15-1761-94) are a by-product of the production of ethylene glycol and are an aqueous solution of a mixture of glycols with a mass fraction of 75-90%, which contains 60-80 wt.% Ethylene glycol, 5-20 wt.% diethylene glycol, up to 5% triethylene glycol.

Comparative analysis with the prototype shows that this composition of the antifreeze concentrate differs from the known one by the introduction of new components: anticorrosive compositions containing from one to five alkali metal salts of adipic, succinic, sebacic, benzoic, 2-ethylhexanoic acids in any combination and in any ratio, caprolactam, sodium polyacrylate. The composition of the antifreeze concentrate is represented by readily available domestic raw materials.

Thus, the claimed technical solution meets the criterion of novelty.

The use of new components in this composition in combination with the known and the found ratio of all ingredients provide properties that are manifested only in the specified technical solution, namely:

- high anticorrosive properties of antifreeze or coolant obtained on its basis, relative to structural materials (copper, solder, brass, steel, cast iron, aluminum), including protection against cavitation and erosion (see table 2);

- a high degree of stability of antifreeze during storage and operation at high temperatures (see table 4).

The proposed composition prevents mineral deposits in closed water systems, is resistant to hard water, and prevents the oxidation of ethylene glycol.

When studying other technical solutions in this field of technology, signs that distinguish the claimed invention from the prototype were not identified, which ensures that this technical solution meets the criterion of significant differences.

A concentrate of this composition is prepared by sequentially mixing the components.

Example 1. In a container with a stirrer, 5.0 g of water, 0.01 g of sodium molybdate, 0.001 g of benzotriazole, 0.001 g of caprolactam, 0.001 g of sodium polyacrylate, 74.97 g of ethylene glycol, 0.005 g of sodium salt of 2-mercaptobenzthiazole, 10, 0 g of sodium salt of adipic acid, 0.01 g of sodium salt of sebapinic acid, 10.0 g of sodium salt of benzoic acid. The mixture is stirred at ambient temperature for 1 h until the components are completely dissolved.

Example 2. In a container with a stirrer placed 8.0 g of water, 3.0 g of sodium molybdate, 1.2 g of tolyltriazole, 1.5 g of caprolactam, 0.05 g of sodium polyacrylate, 72.65 g of ethylene glycol, 0.1 g potassium salt of 2-mercaptobenzthiazole, 0.5 g of potassium salt of adipic acid, 10.0 g of potassium salt of succinic acid, 3.0 g of potassium salt of benzoic acid. The mixture is stirred at ambient temperature for 1 h until the components are completely dissolved.

Examples 3 and 4 are carried out analogously to Example 2.

Example 5. 12.0 g of water, 3.0 g of sodium molybdate, 5.0 g of tolyltriazole, 0.5 g of caprolactam, 0.05 g of sodium polyacrylate, 57.83 g of ethylene glycol, 1.1 g the sodium salt of 2-mercaptobenzthiazole, 0.5 g of the sodium salt of adipic acid, 0.01 g of the sodium salt of succinic acid, 0.01 g of the sodium salt of sebapinic acid, 20.0 g of the sodium salt of 2-ethylhexanoic acid. The mixture is stirred as described in example 1.

Examples 6-27 are prepared analogously to Examples 1 and 2.

Example 28. In a container with a stirrer placed 10.0 g of water, 3.0 g of sodium molybdate, 2.0 g of benzotriazole, 1.0 g of caprolactam, 0.05 g of sodium polyacrylate, 72.41 g of propylene glycol, 1.0 g potassium salt of 2-mercaptobenzthiazole, 0.5 g of potassium salt of adipic acid, 5.0 g of potassium salt of succinic acid, 5.0 g of potassium salt of sebacic acid, 0.01 g of potassium salt of benzoic acid, 0.03 g of potassium salt 2- ethylhexanoic acid. The mixture is stirred as described in example 1.

Examples 29-30 are prepared analogously to Example 28.

Example 31. In a container with a stirrer, 10.0 g of water, 3.0 g of sodium molybdate, 2.0 g of tolyltriazole, 1.0 g of caprolactam, 0.05 g of sodium polyacrylate, 72.41 g of polyglycols containing ethylene glycol 78 wt. %, diethylene glycol 5.2 wt.% and water 16.8 wt.%, 1.0 g of sodium salt of 2-mercaptobenzthiazole, 0.5 g of sodium salt of adipic acid, 5.0 g of sodium salt of succinic acid, 5.0 g of sodium salt of sebacic acid, 0.01 g of sodium salt of benzoic acid, 0.03 g of sodium salt of 2-ethylhexanoic acid. The mixture is stirred as described in example 1.

Examples 32-34 are prepared analogously to Example 31.

The compositions of the antifreeze concentrate according to examples 1-34 and the prototype are shown in table 1.

From the compositions of the antifreeze concentrate shown in table 1, antifreeze samples are prepared for testing for corrosion by metals by diluting it with ethylene glycol, or propylene glycol, or polyglycols in a ratio of 1: 4.

Antifreeze samples are subjected to corrosion tests in the form of their 50% solutions according to ASTM D 1384 for 336 hours at 88 ± 1 ° C with aeration by air.

Comparative results of corrosion tests are presented in table 2. The main physico-chemical properties of the antifreeze concentrate and antifreeze obtained on its basis are presented in table 3.

Determination of storage stability at elevated temperatures of coolants obtained on the basis of antifreeze concentrate is carried out according to the methodology of AvtoVAZ Technical Requirements (TTM 1.97.1172 - 2004) and Ford Engineering Materials Specification (WSS-M97 B44-D). The coolant concentrate in an amount of 60 ml is placed in a thermostat in a hermetically sealed vessel and heated to 65 ± 2 ° C for 14 days. The presence of gelatinous sediment is monitored on days 2, 7, 10, 14. If sediment appears, the test is terminated. In the absence of sediment, 30 ml of the test liquid is dissolved in the same amount of synthesized hard water containing 275 mg / dm ³ calcium chloride, 148 mg / dm ³ sodium sulfate, 165 mg / dm ³ sodium chloride, 138 mg / dm ³ sodium bicarbonate. The resulting solution was again placed in a thermostat at a temperature of 65 ± 2 ° C for the next 14 days, the presence of sediment was monitored on days 2, 7, 10 and 14. If sediment is present, the liquid is considered to have failed the test.

The results of tests for stability at high temperature are presented in table 4.

In addition, antifreeze samples prepared on the basis of an antifreeze concentrate are tested for hardness in hard water according to GOST 28084-89. The criterion for the resistance of antifreeze to hard water is the absence of sediment and separation of the liquid phase. The determination of the alkalinity reserve is carried out according to the method of ASTM D 1121. The hydrogen index (pH) is measured in 30% aqueous solutions of the samples of the concentrate according to the method of ASTM D 1287.

As can be seen from tables 1 and 2, the compositions 1-3, 5-7, 27-29, 31, 32 have high anticorrosive properties. A decrease in the concentration of sodium molybdate below 0.01 wt.% Causes increased corrosion of steel (example 4), and an increase above 10.0 wt.% Does not increase the positive effect (example 8).

A decrease in the concentration of benzotriazole or tolyltriazole below 0.001 wt.%, I.e. practically their exclusion causes corrosion of copper and brass (example 9), and its increase above 5.0 wt.% does not lead to a positive effect (examples 10 and 30, respectively).

With a decrease in the content of sodium or potassium salt of 2-mercaptobenzthiazole below 0.005 wt.%, The protection of non-ferrous metals is significantly reduced (example 11), and an increase in its content above 1.2 wt.% Leads to the formation of an insoluble precipitate, as well as to a decrease in the protection of non-ferrous metals ( example 12).

A decrease in the concentration of caprolactam below 0.001 wt.%, Practically its exclusion, leads to a decrease in the corrosion resistance of non-ferrous metals (example 13), an increase in its content above 1.5 wt.% Sharply enhances the corrosion of all metals (example 14).

A decrease in the content of sodium polyacrylate below 0.001 wt.%, Practically its exclusion, leads to precipitation when mixed with hard water (example 15). The increase in its concentration above 3.0 wt.% Does not give a positive effect (example 16).

With a decrease in the content of sodium or potassium salt of adipic acid below 0.01 wt.%, The corrosion of steel and cast iron increases sharply (example 17), with an increase in its content above 10.0 wt.%, The concentrate is obtained in the form of a saturated solution, which leads to precipitation and reduces the corrosion protection of ferrous metals and aluminum (example 18).

A decrease in the concentration of sodium or potassium salt of succinic acid below 0.01 wt.% Slightly reduces the protection of solder and aluminum from corrosion (example 19), an increase in its content above 10.0 wt.% Leads to the formation of a precipitate (example 20).

With a decrease in the content of sodium or potassium salt of sebacic acid below 0.01 wt.%, There is a decrease in the protection of solder, steel, cast iron (example 23). The increase in the content above 10.0 wt.% Leads to the formation of a precipitate (example 24).

A decrease in the concentration of sodium or potassium salt of benzoic acid below 0.005 wt.% Leads to an increase in corrosion of ferrous metals (example 21), an increase in its content above 10.0 wt.% Leads to the formation of a precipitate (example 22).

When the content of sodium or potassium salt of 2-ethylhexanoic acid is lower than 0.005 wt.%, The corrosion protection of ferrous metals and aluminum is sharply reduced (example 25), with an increase in its content above 20.0 wt.%, A saturated salt solution is formed, which leads to corrosion all metals (example 26).

The decrease in the total concentration of the mixture of sodium or potassium salts of adipic, succinic, sebacic, benzoic, 2-ethylhexanoic acids below the lower limit causes increased corrosion of copper, solder, steel, cast iron, aluminum (example 33). The increase in the total concentration of the mixture of these components above the upper limit leads to the formation of an insoluble precipitate in the form of a suspension, which sharply reduces the corrosion protection of all metals (example 34).

Dilution of the antifreeze concentrate with ethylene glycol, or propylene glycol, or with a water-glycol mixture or polyglycols allows to obtain antifreeze and coolants with a given freezing temperature from minus 10 to minus 65 ° C.

Thus, the use of new components in the composition of the antifreeze concentrate according to the invention in combination with the known ones and the found ratio of ingredients and the synergistic combination of mono- and dicarboxylic acids allows to obtain antifreezes and coolants that provide high and long-term corrosion protection with respect to structural materials of internal combustion engines or heat exchangers (copper, solder, brass, steel, cast iron, aluminum), protection against cavitation and erosion without the use of nitrites, resistance to of a tight water, stability at high temperatures.

Table 1 Name of components Composition of antifreeze concentrate 1 2 3 4 5 6 7 Content, wt.% 1. Sodium molybdate 0.01 3.0 10.0 0.005 3.0 5,0 1,0 2. Benzotriazole 0.001 - 5,0 1,5 - - 1,0 3. Tolyltriazole - 1,2 - 1,5 5,0 0.001 1,0 4. Sodium or potassium salt of 2-mercaptobenzthiazole 0.005 0.1 1,2 0.9 1,1 1,0 0.1 5. Caprolactam 0.001 1,5 0.15 0.2 0.5 0.2 0.2 6. Sodium polyacrylate 0.001 0.05 3.0 0.05 0.05 0.003 0.05 7. Sodium or potassium salt of adipic acid 10.0 0.5 0.01 10.0 0.5 0.01 10.0 8. Sodium or potassium salt of succinic acid - 10.0 5.7 0.01 0.01 10.0 3.2 9. Sodium or potassium salt of sebacic acid 0.01 - 10.0 7.4 0.01 3,5 10.0 10. Sodium or potassium salt of benzoic acid 10.0 3.0 0.005 0.1 - - - 11. Sodium or potassium salt of 2-ethylhexanoic acid - - - - 20,0 10.0 0.005 12. The alkali metal salt of neodecane
acid - - - - - - - 13. Sodium nitrate - - - - - - - 14. Sodium silicate - - - - - - - 15. Borax - - - - - - - 16. Water 5,0 8.0 15.0 15.0 12.0 10.0 10.0 17. Ethylene glycol rest 18. Propylene glycol - - - - - - - 19. Polyglycols - - - - - - -

Table 1 (continued) Name of components Composition of antifreeze concentrate 8 nine 10 eleven 12 thirteen 14 Content, wt.% 1. Sodium molybdate 12.0 5,0 5,0 5,0 5,0 3.0 3.0 2. Benzotriazole 0.5 - 7.0 1,5 1,5 2.0 - 3, Tolyltriazole - - - 1,5 1,5 - 2.0 4. Sodium or potassium salt of 2-mercaptobenzthiazole 0.1 1,0 1,0 0.001 2.0 1,0 1,0 5. Caprolactam 0.2 0.5 0.5 0.5 0.5 - 2.0 6. Sodium polyacrylate 0.1 2.0 2.0 2.0 0.5 0.1 0.1 7. Sodium or potassium salt of adipic acid - 0.5 0.5 - - 10.0 10.0 8. Sodium or potassium salt of succinic acid - - - 5,0 - 5,0 5,0 9. Sodium or potassium salt of sebacic acid 0.5 0.5 0.5 2.0 2.0 - - 10. Sodium or potassium salt of benzoic acid 0.005 10.0 3.0 - 2.0 2.0 2.0 11. Sodium or potassium salt of 2-ethylhexanoic acid 0.005 10.0 20.0 2.0 - - - 12. The alkali metal salt of neodecane
acid - - - - - - - 13. Sodium nitrate - - - - - - - 14. Sodium silicate - - - - - - - 15. Borax - - - - - - - 16. Water 10.0 12.0 12.0 10.0 10.0 11.0 11.0 17. Ethylene glycol rest 18. Propylene glycol - - - - - - - 19. Polyglycols - - - - - - -

Table 1 (continued) Name of components Composition of antifreeze concentrate fifteen 16 17 eighteen 19 7 20 21 Content, wt.% 1. Sodium molybdate 3.0 3.0 3.0 3.0 3.0 3.0 10.0 2. Benzotriazole 2.0 2.0 - - - - 5,0 3. Tolyltriazole - - 1,2 1,2 5,0 5,0 - 4. Sodium or potassium salt of 2-mercaptobenzthiazole 1,0 0.5 0.1 0.1 1,1 1,1 1.2 5. Caprolactam 0.2 0.2 1,5 1,5 0.5 0.5 0.15 6. Sodium polyacrylate - 4.0 0.05 0.05 0.05 0.05 3.0 7. Sodium or potassium salt of adipic acid - - 0.005 11.0 0.5 0.5 0.01 8. Sodium or potassium salt of succinic acid - - 10.0 10.0 0.005 11.0 5.7 9. Sodium or potassium salt of sebacic acid 5,0 3.0 - - 0.01 0.01 10.0 10. Sodium or potassium salt of benzoic acid 2.0 2.0 3.0 3.0 - - 0.001 11. Sodium or potassium salt of 2-ethylhexanoic acid 10.0 5,0 - - 20,0 20,0 - 12. The alkali metal salt of neodecane
acid - - - - - - - 13. Sodium nitrate - - - - - - - 14. Sodium silicate - - - - - - - 15. Borax - - - - - - 16. Water 10.0 10.0 5,0 5,0 12.0 12.0 15.0 17. Ethylene glycol rest 18. Propylene glycol - - - - - - - 19. Polyglycols - - - - - - -

Table 1 (continued) Name of components Composition of antifreeze concentrate 22 23 24 25 26 1 27 28 Content, wt.% 1. Sodium molybdate 0.01 3.0 1,0 1,0 3.0 3.0 3.0 2. Benzotriazole 0.001 - 1,0 1,0 - 2.0 2.0 3. Tolyltriazole - 5,0 1,0 1,0 5,0 - - 4. Sodium or potassium salt of 2-mercaptobenzthiazole 0.005 1,1 0.1 0.1 1,1 1,2 1,0 5. Caprolactam 0.001 0.5 0.2 0.2 0.5 1,5 1.0 6. Sodium polyacrylate 0.001 0.05 0.05 0.05 0.05 0.05 0.05 7. Sodium or potassium salt of adipic acid 10.0 0.5 10.0 10.0 0.5 0.01 0.5 8. Sodium or potassium salt of succinic acid - 0.01 3.2 3.2 0.01 0.01 5,0 9. Sodium or potassium salt of sebacic acid 0.01 0.005 11.0 3,5 0.01 0.01 5,0 10. Sodium or potassium salt of benzoic acid 11.0 - - - - 0.005 0.01 11. Sodium or potassium salt of 2-ethylhexanoic acid - 20,0 0.005 0.001 21.0 0.005 0,03 12. The alkali metal salt of neodecane
acid - - - - - - - 13. Sodium nitrate - - - - - - - 14. Sodium silicate - - - - - - - 15. Borax - - - - - - - 16. Water 5,0 12.0 10.0 10.0 12.0 9.0 10.0 17. Ethylene glycol rest 18. Propylene glycol - - - - - rest 19. Polyglycols - - - - - - -

Table 1 (continued) Name of components Composition of antifreeze concentrate 29th thirty 31 32 33 34 prototype The content, wt.% 1. Sodium molybdate 0.01 3.0 3.0 0.01 3.0 0.01 - 2. Benzotriazole 0.5 - - - 2.0 0.5 0.02-2.0 3. Tolyltriazole - 5.8 2.0 0.5 - - 0.02-2.0 4. Sodium or potassium salt of 2-mercaptobenzthiazole 0.02 1,2 1,0 0.02 1,2 0.01 - 5. Caprolactam 0.05 1,5 1,0 0.05 1,5 0.05 - 6. Sodium polyacrylate 0.05 0.05 0.05 0.05 0.05 0.03 - 7. Sodium or potassium salt of adipic acid 10.0 0.01 0.5 10.0 0.005 10.5 - 8. Sodium or potassium salt of succinic acid 10.0 0.01 5,0 10.0 0.002 10,2 - 9. Sodium or potassium salt of sebacic acid 10.0 0.01 5.0 10.0 0.005 10.5 - 10. Sodium or potassium salt of benzoic acid 10.0 0.005 0.01 10.0 0.001 11.0 - 11. Sodium or potassium salt of 2-ethylhexanoic acid 20,0 0.005 0,03 20,0 0.001 20.7 0.1-6.0 12. The alkali metal salt of neodecane
acid - - - - - - 0.8-1.1 13. Sodium nitrate - - - - - - 0.26 14. Sodium silicate - - - - - - 0.33 15. Borax - - - - - - 2.1 16. Water 15.0 9.0 10.0 15.0 10.0 15.0 4.0 17. Ethylene glycol - - - - - - rest 18. Propylene glycol rest - - - - - - 19. Polyglycols - rest -

table 2
Results of corrosion tests of antifreeze obtained on the basis of antifreeze concentrate. Tests were conducted according to GOST 28084-89 Composition Material copper solder brass steel cast iron aluminum weight loss, g / m ² · day 1 0,03 0.08 0,03 0.01 0.02 0.02 2 0.02 0.09 0.02 0.02 0,03 0.01 3 0.02 0.10 0.02 0.01 0.02 0.02 4 0.03 0.09 0,03 0.019 0.04 0,03 5 0.01 0.05 0,03 0.01 0.01 0.01 6 0.02 0.08 0.02 0.01 0.02 0.02 7 0.01 0.08 0,03 0.02 0.02 0.01 8 0.02 0.08 0.04 0.04 0,03 0.02 nine 0.21 0.10 0.17 0,03 0.02 0.02 10 0,03 0.09 0,03 0.01 0.02 0.01 eleven 0.15 0.28 0.25 0.04 0,03 0,03 12 0.17 0.23 0.15 0,03 0.02 0.02 thirteen 0.18 0.23 0.19 0,03 0.01 0.01 14 0.20 0.25 0.15 0.19 0.20 0.23 fifteen 0.05 0.09 0.05 0.10 0,03 0,03 16 0.08 0.10 0.06 0.02 0.04 0.05 17 0.06 0.10 0.05 0.29 0.31 0.06 eighteen 0.09 0.09 0.04 0.18 0.29 0.38 19 0.04 0.32 0.04 0.02 0.02 0.29 twenty 0.05 0.20 0.08 0.05 0,03 0.12 21 0,03 0.12 0.04 0.37 0.29 0.05 22 0,03 0.15 0.05 0.35 0.30 0.06 23 0,03 0.33 0.05 0.28 0.30 0.05 24 0.06 0.09 0.06 0.29 0.32 0.38 25 0.05 0.20 0,07 0.34 0.35 0.40 26 0.15 0.26 0.18 0.23 0.28 0.34 27 0,03 0.05 0,03 0.01 0.02 0.01 28 0.02 0.06 0.01 0.02 0.02 0,03 29th 0.02 0,07 0.02 0.01 0.01 0.01 thirty 0,03 0.12 0,03 0.01 0.04 0.02 31 0.02 0.08 0,03 0.02 0.01 0.02 32 0.02 0.05 0.01 0.01 0.02 0.02 33 0.19 0.32 0.05 0.26 0.18 0.23 34 0.21 0.33 0.28 0.20 0.21 0.32

Table 2 (continued) Prototype
g / m ² -0.4 -3.9 -0.3 -1.8 -1.3 -9.4 Requirements GOST 28084-89, g / m ² · day 0.1 0.2 0.1 0.1 0.1 0.1 Table 3
Physico-chemical properties of the antifreeze concentrate and antifreeze obtained on its basis No. Name of indicator Antifreeze concentrate Antifreeze 1. Appearance Transparent colorless homogeneous liquid without mechanical impurities Transparent painted liquid without mechanical impurities 2. Density at 20 ° C
g / cm ³ 1,100-1,220 1,110-1,145 3. Hydrogen index (pH) at 20 ° С 7.5-9.0
when diluted with distilled water in a ratio of 1: 2 7.5-9.0
when diluted with distilled water in a ratio of 1: 1 4. Alkalinity reserve,
cm ³ - not less than 5.0 5. Hard water resistance - No stratification and sediment

Table 4.
The results of determining the stability of coolants obtained on the basis of antifreeze concentrate during storage at high temperature Composition of antifreeze concentrate Type of coolant after heating at 65 ± 2 ° C without dilution after dilution on day 2 on day 7 on day 10 on day 14 on day 2 on day 7 on day 10 on day 14 Compositions
1-3, 5-7, 27-29.31, 32 no sediment no sediment no sediment no sediment no sediment no sediment no sediment no sediment Composition 1 with the addition of 0.33 wt.% Sodium silicate no sediment no sediment the presence of a gel-like precipitate - - - - - Composition 27 with the addition of 0.33 wt.% Sodium silicate no sediment the presence of sediment - - - - - - Composition 32 with the addition of 0.33 wt.% Sodium silicate no sediment no sediment the presence of sediment - - - - -

Claims (2)

1. A glycol-based antifreeze concentrate containing anticorrosive additives and water, characterized in that a mixture of alkali metal salts of mono- and dicarboxylic acids — adipic, succinic, sebacic, benzoic and 2-ethylhexanoic acid in any combination of them and in any combination, is used as anticorrosive additives any ratio, benzotriazole or tolyltriazole, sodium molybdate, alkali metal salt of 2-mercaptobenzthiazole (captax), caprolactam, sodium polyacrylate, in the following ratio, wt.%: Sodium or potassium salt adipic acid or sodium or potassium salt succinic acid or sodium or potassium salt sebacic acid or sodium or potassium salt benzoic acid or sodium or potassium salts 2-ethylhexanoic acid or a mixture thereof  in any combination and in any ratio 0.005-60.0 Sodium Molybdate 0.01-10.0 Benzotriazole or tolyltriazole or their mixture in equal proportions 0.001-5.0 Sodium or potassium salt 2-mercaptobenzthiazole (captax) 0.005-1.2 Caprolactam 0.001-1.5 Sodium Polyacrylate (average molecular weight 8000 g / mol) 0.001-3.0 Water 5.0-15.0 Ethylene glycol or propylene glycol or polyglycols Rest 2. The antifreeze concentrate according to claim 1, characterized in that it contains, as a corrosion inhibitor, wt.%: 0.01-10.0 sodium or potassium salt of adipic acid, or 0.01-10.0 sodium or potassium salt succinic acid, or 0.01-10.0 sodium or potassium salt of sebacic acid, or 0.005-10.0 sodium or potassium salt of benzoic acid, or 0.005-20.0 sodium or potassium salt of 2-ethylhexanoic acid, or a mixture thereof any combination or in any ratio.