RU2519177C1 - Deicing fluid - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: applied is the following composition, wt %: - 80-88 - polypropylene glycol; - 0.0006-0.0008 - organic triactive orange s-2r; - 0.0018-0.0022 - organic direct red; - 0.15-0.20 - 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; - 0,015-0,02 - sodium acetate pH stabiliser; deionised water - the remaining part.

EFFECT: obtaining deicing fluid, which is more environmentally friendly, possesses 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. In the claimed anti-icing composition, propylene glycol is used, which is an environmentally friendly substance, and sodium acetate provides enhanced thermal stability together with potassium hydroxide.

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, 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 CnH ₂ n + 1CONHCH ₂ CH ₂ CH ₂ O (C ₂ H ₄ O) mH or anionic Surfactant salts of alkyl aromatic sulfonic acids of the formula CnH ₂ n + 1C ₆ H ₄ SO ₃ Na), as well as fragrance, 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.

A patent is known for the UNION CARBIDE CHEMICALS AND PLASTICS TECHNOLOGY CORPORATION (US) RU 2183216, which describes a universal aircraft fluid based on an aqueous solution of glycols or glycerol or a mixture thereof, thickened with a polymer thickener and / or its salt after neutralization, which contains about 40% and contains about 40% 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, a surfactant that forms an associate with thicken cm, 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.

Known anti-icing fluid (options), RU 2192443, 2002, containing glycol, a surfactant, a corrosion inhibitor, disubstituted alkali metal phosphate, water, a surfactant is a technical mixture of polyethylene glycol ethers of monoalkylphenols based on propylene trimers. The disadvantages inherent in this fluid also relate to insufficiently high performance properties.

The technical result of the claimed invention is to obtain an anti-icing fluid, which has stable thermostable properties and color, enhanced anti-corrosion properties and performance characteristics that meet the requirements of SAE AMS 1424 and ISO 11075, which is more environmentally friendly.

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

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

- 80-88 - propylene glycol;

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

- 0.0018-0.0022 - organic direct scarlet dye;

- 0.15-0.20 - tolyltriazole;

- 0.04-0.06 - sodium nitrite;

- 0.3-0.44 - ethoxylated nonylphenol nonionic surfactant;

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

- 0.015-0.02 - potassium hydroxide, pH stabilizer;

- 0.015-0.02 - sodium acetate, pH stabilizer;

- deionized water - the rest.

The composition uses propylene glycol, which is a more environmentally friendly substance than its analogues, and sodium acetate provides enhanced thermal stability together with potassium hydroxide.

A biodegradable complexing agent, a water hardness regulator, hydroxyethylethylenediamine triacetic sodium, was introduced into the compositions 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 we see, the essence of the invention: consists 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 reagents);

- nonionic surfactant;

- pH stabilizers.

Acidic, active, direct organic colorants can be used in the composition.

Example 1. Composition in wt.%:

- 84 - propylene glycol;

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

- 0.0022 - organic direct scarlet;

- 0.20 - tolyltriazole;

- 0.04 - sodium nitrite;

- 0.3 - ethoxylated nonylphenol;

- 0.04 - hydroxyethylethylene diamine triacetic sodium;

- 0.017 - potassium hydroxide;

- 0.02 - sodium acetate;

- deionized water - the rest.

Example 2. Composition in wt.%:

- 88 - propylene glycol;

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

- 0.0018 - organic direct scarlet;

- 0.18 - tolyltriazole;

- 0.05 - sodium nitrite;

- 0.37 - ethoxylated nonylphenol;

- 0,047 - hydroxyethylethylenediamine triacetic sodium;

- 0.016 - potassium hydroxide;

- 0.02 - sodium acetate;

- 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, not less than 1.04.

Hydrogen pH, GOST 22576.5-77, in the range of 7.8-8.8.

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

Freezing temperature, ° C, GOST18995.5-73:

a) without dilution with water, not higher than minus 55;

b) when diluted with water 1: 1 by volume, not higher than minus 20.

Kinematic viscosity at 20 ° C, mm ² , GOST 33-82, no more than 25.

De-icing properties:

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

b) test in conditions of freezing rain - not less than 3 min.

Toxicity:

Hazard class according to GOST 12.1.007 - 4.

From the results it follows that the proposed anti-icing fluids (examples 1 and 2) 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 fluid containing a surfactant, a corrosion inhibitor, characterized in that it contains propylene glycol, dyes, a biodegradable complexing agent-regulator of water hardness, hydroxyethylene ethylene diamine triacetic sodium, nonionic surfactant, pH stabilizers, at the following components, wt .%:
- 80-88 - propylene glycol;
- 0,0006-0,0008 - organic active orange 2K beef dye;
- 0.0018-0.0022 - organic direct scarlet dye;
- 0.15-0.20 - 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;
- 0.015-0.02 - sodium acetate, pH stabilizer;
- deionized water - the rest.