RU2519175C1 - Deicing fluid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method is realised by application of the following composition, wt %: 80-88 -monoethylene glycol; 0.0006-0.0008 - organic triactive orange s-2r; 0.0018-0.0022 - organic direct red; 0.15-0.2 - tolyltriazole; 0.04-0.06 - sodium nitrite; 0.3-0.44 - oxyethylated nonylphenol - non-ionogenic surface-active substance; 0.04-0.06 - hydroxyethylenediaminetriacetic sodium - biodegradable complexon-forming agent - regulator of water hardness; 0.015-0.02 - potassium hydroxide - pH stabiliser; deionised water - the remaining part.

EFFECT: obtaining deicing fluid, possessing stable thermo-resistant properties and coloration, higher anticorrosion properties and exploitation characteristics, satisfying SAE AMS 1424 and ISO 11075 standards.

2 ex

Description

The invention relates to the field of chemical compositions for preventing icing, the use of liquids for de-icing (removal of snow and ice deposits) processing and anti-icing protection of aircraft on the ground.

The following compositions of anti-icing fluids are known from the prior art, which have one or another disadvantage, such as insufficient thermal stability, insufficient anti-corrosion properties, low operational characteristics that do not allow them to be recognized as meeting the standards adopted in the industry.

For example, an isopropyl alcohol-based liquid known from SU 947169 containing nonionic surfactants: monoalkyl ethers of polyethylene glycol based on primary alcohols of the formula or polyethylene glycol ethers of monoethanolamides of the formula CnH2n + 1CONHCH2CH2CH2O (C2H4O) mH or anionoHnono + H2On perfume, dye and water.

The disadvantage is that this fluid does not meet the requirements for anti-icing fluids to protect the aircraft from ground icing for anti-icing and anti-corrosion properties and the effects on paints, organic glass and rubber. The liquid removes ice deposits and protects the aircraft from re-icing for 3-5 minutes, which is not enough for the actual operating conditions of the aircraft.

A glycol-based anti-icing fluid containing a surfactant is known, which is used as the ethoxylated higher fatty alcohols of the C12-C18 fraction with an oxyethylation number of 7-10, a corrosion inhibitor, which is used as 1,2,3-benzotriazole or tolyltriazole , and a pH regulator, which is used as an alkali metal hydroxide, RU 2336290.

An important step forward in the technology of anti-aircraft icing fluids was provided by the compositions proposed in U.S. Patent 5,461,100 and in U.S. Patent Application 08/065237, with its filing date May 20, 1993, both pending and general purpose. Both of these documents are hereby incorporated by reference. These inventions are based on the unexpected discovery of the authors that some polymer thickeners containing macromonomers, the thickening effect of which is due to the association among hydrophobic groups, have specific effectiveness as thickeners for glycol-based fatty acids.

The patent UNION CARBIDE CHEMICALS AND PLASTICS TECHNOLOGY CORPORATION (US) RU2183216 is known, which describes a universal aircraft liquid based on an aqueous solution of glycols, or glycerol, or a mixture thereof, thickened with a polymer thickener and / or its salt after about 40% neutralization, which contains about 40% of neutralization and more glycols, or glycerol, or mixtures thereof, at least about 0.05% thickener, a neutralizing agent, which is sodium hydroxide to achieve a pH of about 7.1, the surfactant that forms an associate with thicken oil, corrosion inhibitor, dye and water - the rest. The thickener includes the following components: 1-99.9 one or more α-, β-unsaturated carboxylic acids with a monoethylene bond, 0-98.9% of one or more unsaturated monomers with a monoethylene bond, 0.1-99% of one and more unsaturated monomers with a monoethylene bond, preferably macromonomers containing at least one side hydrophobic fragment and 0-20% of one or more unsaturated monomers with polyethylene bonds. A method for producing a composition is described. EFFECT: liquid has good resistance to lowering viscosity and other critical parameters under the influence of heat and / or shear forces.

Known anti-icing fluid according to patent RU 2230091 for removing ice deposits and preventing icing of the surface, which is used to protect aircraft or other types of equipment from icing while they are standing on the ground. The anti-icing fluid contains an alkylene polyol, a corrosion inhibitor, a nonionic surfactant, a water-insoluble additive, a thickener, an alkali metal hydroxide and / or ammonium and water.

Common disadvantages of these inventions is that this fluid does not meet the requirements for anti-icing fluids to protect the aircraft from ground icing for anti-icing and anticorrosion properties.

The technical result of the claimed invention is to obtain a liquid that has stable thermostable properties and color, enhanced anti-corrosion properties and performance characteristics that meet the requirements of SAE AMS 1424 and ISO 11075.

The technical result is achieved by the following anti-icing fluid composition.

A water-glycol-based anti-icing liquid containing a surfactant, a corrosion inhibitor, characterized in that it contains monoethylene glycol, dyes, a biodegradable complexing agent-regulator of water hardness, hydroxyethylene ethylene diamine triacetic sodium, nonionic surfactant, pH stabilizers, at the following components, mass .%:

- 80-88 - monoethylene glycol;

- 0,0006-0,0008 - organic active orange 2K beef dye;

- 0.0018-0.0022 - organic direct scarlet dye;

- 0.15-0.2 - tolyltriazole;

- 0.04-0.06 - sodium nitrite;

- 0.3-0.44 - ethoxylated nonylphenol - nonionic surfactant;

- 0.04-0.06 - hydroxyethylethylene diamine triacetic sodium - biodegradable complexing agent-regulator of water hardness;

- 0.015-0.02 - potassium hydroxide - pH stabilizer;

- deionized water - the rest.

The composition of the compositions introduced biodegradable complexing agent - a regulator of water hardness - hydroxyethylethylenediamine triacetic sodium to create soluble complexes with metal ions in a wide range of pH (2-12) and temperature (up to 120 ° C);

EFFECT: invention makes it possible to remove snow-ice formations (SLO) from the aircraft surface and to provide the required level of anti-icing protection of aircraft surfaces under conditions of ground icing.

As you can see, the essence of the invention lies in the use of anti-icing liquid of a water-glycol mixture (monoethylene glycol, propylene glycol) and functional components:

- Acid, active, direct organic dyes;

- corrosion inhibitors;

- complexing agents (chelating agents);

- nonionic surfactant;

- pH stabilizers.

Acid dyes - active, direct organic, can be used in the composition.

Example 1. composition in wt.%

Prepare a liquid composition:

- 80 - monoethylene glycol;

- 0,0006 - organic active orange 2K beef;

- 0.0018 - organic direct scarlet;

- 0.15 - tolyltriazole;

- 0.04 - sodium nitrite;

- 0.3 - ethoxylated nonylphenol;

- 0.04 - hydroxyethylethylene diamine triacetic sodium;

- 0.015 - potassium hydroxide;

- deionized water - the rest.

Example 2. composition in wt.%

- 82 - monoethylene glycol;

- 0,00075 - organic active orange 2K beef;

- 0.0021 - organic direct scarlet;

- 0.19 - tolyltriazole;

- 0.05 - sodium nitrite;

- 0.41 - ethoxylated nonylphenol;

- 0,045 - hydroxyethylethylenediamine triacetic sodium;

- 0.0176 - potassium hydroxide;

- deionized water - the rest.

The anti-icing fluids obtained in examples 1, 2 have the following physicochemical and operational properties:

Density at 20 ° C, GOST 18.995.1-73, in the range of 1.105-1.07;

Hydrogen pH, GOST 22576.5-77, in the range of 7.8-8.6;

Flash point, ° C, GOST 6356-82, not lower than 100;

Freezing temperature, ° С, GOST 18995.5-73:

- without dilution with water - not higher than minus 56;

- when diluted with water 1: 1 by volume - not higher than minus 35;

Kinematic viscosity at 20 ° C, mm ² , GOST 33-82, no more than 250.

De-icing properties:

a) tests at high humidity (NO) - at least 20 minutes;

b) a test in conditions of freezing rain - at least 3 minutes.

Toxicity:

Hazard class according to GOST 12.1.007 - 4.

From the results it follows that the proposed anti-icing fluids fully comply with international standards SAE AMS and 1424 ISO 11075, the requirements of civil aviation in Russia.

Claims (1)

A water-glycol-based anti-icing liquid containing a surfactant, a corrosion inhibitor, characterized in that it contains monoethylene glycol, dyes, a biodegradable complexing agent-regulator of water hardness - hydroxyethylethylenediaminetriacetic sodium, nonionic surfactant, pH stabilizers, with the following components, mass%:
- 80-88 - monoethylene glycol;
- 0,0006-0,0008 - organic active orange 2K beef dye;
- 0.0018-0.0022 - organic direct scarlet dye;
- 0.15-0.2 - tolyltriazole;
- 0.04-0.06 - sodium nitrite;
- 0.3-0.44 - ethoxylated nonylphenol - nonionic surfactant;
- 0.04-0.06 - hydroxyethylethylene diamine triacetic sodium - biodegradable complexing agent-regulator of water hardness;
- 0.015-0.02 - potassium hydroxide - pH stabilizer;
- deionized water - the rest.