RU2253663C1 - Coolant fluid - Google Patents

Abstract

FIELD: special-destination fluids.

SUBSTANCE: coolant fluid used in cooling systems of internal combustion engines and as heat carrier in heat-exchangers is based on ethylene glycol or water-glycol solution (from ethylene glycol production) and contains, wt %: benzoic acid 1.28-3.40m sodium hydroxide 0.56-1.60, sodium nitrite 0.03-0.18, sodium metasilicate nonahydrate 0.05-0.45, sodium tetraborate 0.45-1.35, benzotriazole or tolylotriazole 0.05-0.27, colorant 0.001-0.004, water 1.5-45.0, and ethylene glycol to 100%. Fluid can optionally contain up to 0.001% of foam suppressor.

EFFECT: improved corrosion protein of ferrous and nonferrous metals and reduced foaming.

2 cl, 2 tbl

Description

The invention relates to low-freezing coolants used for cooling internal combustion engines, and also suitable as a coolant in heat exchangers.

The liquids used in the cooling system of internal combustion engines of automobiles are subject to stringent requirements for the lower limit of operating temperature, for pricing, and for the corrosive and chemical effects on metal and rubber parts of engines.

The known composition of the coolant based on ethylene glycol, patent SU No. 1822406, publ. 06/15/93, including, wt.%: Benzoic acid 1.5-3.0; sodium hydroxide 0.5-1.0; alkali metal nitrite 0.05-0.2; sodium salt of 2-mercaptobenzthiazole 0.001-0.015; dextrin 0.05-02; sodium tetraborate hydrate 0.6-1.5; dye 0.005-0.002; silicone polymer 0.007-0.015; potassium rosin soap 0.002-0.004; water 1.0-5.0; ethylene glycol is the rest. The composition has a high crystallization onset temperature: minus 32.5 ° C when diluted with distilled water in a volume ratio of 1: 1, which does not meet the requirements of GOST 28084-89 for coolant concentrate (not higher than minus 35 ° C). In addition, to achieve the desired value of the index "foaming" a rather large amount of antifoam is introduced into the composition - silicone polymer.

Known cooling liquid, publ. 09/27/2003, containing as the basis ethylene glycol or a mixture of ethylene glycol with di -, triethylene glycol and / or monoalkyl ethers (C ₁ -C ₂ ) of polyoxyalkylene glycols of average molecular weight 90-210, and as anti-corrosion additives:

sodium tetraborate ten-water, benzotriazole and / or its derivatives, and / or the sodium or potassium salt of 2-mercaptobenzthiazole, alkali metal hydroxide and / or carbonate, boric or adipic, or sebacic, or benzoic, or triazinotriyl triiminopolyhexane, or 2-ethyl sorbic or 2-mercaptobenzothiazoyl succinic acid, or a mixture of these acids, alkali metal phosphate, and / or high-modulus liquid glass, and / or Trilon B, and / or dextrin, as well as water, a dye, and / or an organosilicon antifoam. This coolant has a complex composition, including 9 additives with their total content from 0.821 to 29.325 wt.%, Which complicates the technology for producing coolant.

The closest in composition to the claimed coolant is the patent, 306162, publ. 30.03.93, containing ethylene glycol, water, sodium hydroxide, benzoic acid, borax, nitrite, nitrate and alkali metal silicate, dye - uranine, antifoam PMS- 200A. This composition has insufficiently high anticorrosive and anti-foaming properties.

The technical task of this invention is to reduce the corrosive effects of coolant on metals and reduce foaming.

The proposed glycol-based coolant contains benzoic acid, sodium hydroxide, sodium nitrite, sodium metasilicate, sodium tetraborate, benzotriazole or tolyltriazole, dye and water in the following ratio, wt.%:

benzoic acid 1.28-3.40

sodium hydroxide 0.56-1.60

sodium nitrite 0.03-0.18

9-aqueous sodium metasilicate 0.05-0.45

sodium tetraborate hydrate (borax) 0.45-1.35

benzotriazole or tolyltrazole 0.05-0.27

dye 0.001-0.004

water 1.5-45.0

glycol rest

Ethylene glycol and / or a water-glycol solution of ethylene glycol production containing 4-15% water, up to 5% diethylene glycol, up to 1% triethylene glycol, and the rest ethylene glycol can be used as glycol in the coolant.

The proposed cooling liquid may additionally contain as a defoamer a block copolymer of propylene oxide and ethylene oxide with a molecular weight of about 3500 EPE-282 or an organosilicon antifoam, in particular polymethylsiloxane liquid.

As a colorant in the proposed coolant, one of the following colorants can be used: sodium fluorescein (uranin), bright blue organic acid dye “Z”, direct organic turquoise color fast-dye, or other similar organic dyes.

The inventive coolant differs from the prototype in the introduction of new components and a new ratio of components.

The use in the proposed composition of the coolant of new components in combination with the known and the found ratio of all ingredients provides such properties that are manifested only in the specified technical solution, namely: low corrosive effects of the coolant on structural materials: steel, cast iron, copper, brass, solder , aluminum and low foaming.

Coolant is prepared as follows. Sodium hydroxide, benzoic acid, sodium tetraborate, benzotriazole or tolyltriazole and antifoam are successively dissolved in ethylene glycol or in a water-glycol solution with stirring at a temperature of 50-55 ° C. Separately, sodium hydroxide, sodium metasilicate, sodium nitrite, and dye are dissolved in water with stirring and at a temperature of 50-55 ° C. Then the solutions are mixed and filtered.

Table 1 presents the compositions of the samples of the coolant. These compositions for all indicators (appearance, density, temperature of crystallization onset, fractional data, corrosive effects on metals, foaming, rubber swelling, hydrogen index, alkalinity, hard water resistance) meet the requirements of GOST 28084: examples 1 to 5 for cooling coolant-K fluids, examples 6 through 11 for coolant-65, examples 12 through 17 for coolant-40. Moreover, the proposed coolant surpasses the prototype in terms of corrosivity to metals and foaming.

Table 2 shows comparative data on the corrosion effect on metals and the expandability of the known coolant and the proposed coolant prepared according to formulations 1-17 of table 1.

Tests of liquids for corrosion on metals and foaming were carried out according to the methods described in GOST 28084-89, which are in full accordance with ASTM methods.

The test results show that the indicators of corrosive effects on metals and foaming samples of the inventive liquid are better than the prototype. It should be noted that for most of the tested samples, foaming is practically absent even without antifoam.

Claims (2)

1. Coolant containing glycol, benzoic acid, sodium hydroxide, sodium nitrite, sodium metasilicate, sodium tetraborate, dye and water, characterized in that it additionally contains benzotriazole or tolyltriazole, contains ethylene glycol and / or water-glycol solution as glycol the production of ethylene glycol in the following ratio of components, wt.%: Benzoic acid 1.28-3.40 Sodium hydroxide 0.56-1.60 Sodium nitrite 0.03-0.18 Sodium metasilicate 9-water 0.05-0.45 Sodium tetraborate hydrate (borax) 0.45-1.35 Benzotriazole or Tolyltriazole 0.05-0.27 Dye 0.001-0.004 Water 1.5-45.0 Ethylene glycol and / or water glycol  ethylene glycol production solution 2. The cooling liquid according to claim 1, characterized in that it can additionally contain as a defoamer a block copolymer of propylene oxide and ethylene oxide or an silicone antifoam in an amount of not more than 0.001 wt.%.