De-icing pseudo-plastic fluid

 

The invention relates to the creation of de-icing fluid (AMPS) to remove ice accumulation and prevent the icing surface, is used to protect aircraft or other equipment from freezing during their stay on earth. De-icing fluid contains alkylaryl, corrosion inhibitor, a nonionic surface-active agent (surfactant), water-insoluble additive, thickening agent, a hydroxide of an alkali metal and/or ammonium, and water. As a water-insoluble additive contains oleic acid. As the thickener is a copolymer of methyl methacrylate and methacrylic acid containing from 70 to 80% of methacrylic acid with an average molecular weight of from 500,000 to 700,000. De-icing fluid according to the invention is effective and keeps the fluid properties after exposure to temperatures of 70 and 95With within 30 days. 12 C. p. F.-ly, 3 tables.

The technical field to which the invention relates

The invention relates to aircraft and, in particular, for non-Newtonian pseudo-plastic de-icing fluid (AMPS) to remove ice accumulation (frost, hoarfrost, snow, ice) and p is used to protect aircraft or other equipment from freezing during their stay on earth.

The level of technology

When ground icing of aircraft ice deposits are usually formed on the fuselage, tail section and most of the wing surface. The phenomenon of icing increases the weight of the plane, the distortion of the profile, the increase in drag and reduction in aerodynamic characteristics. All this can lead to serious flight accidents with casualties.

In operation, the removal of glacial deposits from the surface of the aircraft is carried out by spraying by means of special nozzles heated to 70-80°C, diluted with water AFTER depending on weather conditions in the ratio of 75:25 or 50:50 by volume. In the case of expected icing preventive treatment of the surface of the plane AFTER without dilution and without heating.

In accordance with the international standard ISO 11078, which is characterized in table 1, tests to determine the effectiveness of the LATTER in terms of artificial icing (freezing rain) are carried out after mechanical mixing with a speed of 3500 rpm for 5 minutes and holding at least 20 minutes at rest.

Known after the aircraft (the patent is 1-1,2

Surfactants 0,5-1,0

Water To 100

In the specified ECW as a corrosion inhibitor is used disubstituted phosphate of an alkali metal, as the SAC - bansilalpet methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols, and water-insoluble additives - stearic acid.

According to the international standard ISO 11078 AMPS should meet the basic operational requirements, in particular the preservation of the properties of concentrated AFTER after heating at 70°C for 30 days and diluted with water in the ratio 50:50 by volume AMPS at 95°C for 30 days without significant changes of physico-chemical and performance properties, while also maintaining high efficiency in terms of loss of supercooled rain for at least 30 minutes after mixing with a speed of 3500 rpm for 5 minutes. Famous ECW does not meet these requirements. When warming up, especially at 95°C there is a selection of the specified surfactant. The viscosity of this PLEASE after stirring with a speed of 3500 rpm drops from 50-100 mm2/s up to 14-25 mm2/s, and its effectiveness in terms of supercooled rain drops to 5-15 minutes.

The closest analogue is the LATTER for which 0

Surfactant is 0.02 to 1.5

Thickener 0,05-1,5

Water To 100

The effectiveness of this PLEASE in conditions of artificial icing freezing rain is 43-55 minutes.

In the specified ECW as a corrosion inhibitor used is a water-soluble alkali metal salts of inorganic acids (boric, phosphoric, sulphuric, nitric, acetic), imidazoles or triazoles (benzotriazol, tolyltriazole), as surfactants - nonionic surfactants, which represents an ethoxylated higher fatty alcohol of the formula C6-C22O(C2H4O)]1-10N, and as a thickener - polymer is a water-soluble crosslinked polyacrylic or polymethacrylic acid or their mixture. The average molecular weight of the polymer is 750000-1250000 and viscosity of 0.5 wt.% an aqueous solution (pH 7.0) at 20°C and at a shear rate of 5.6 with-1is 1000-13000 MPaC.

Famous ECW does not meet the requirements sprinkling it on the surface through the nozzle, because when used as a thickener polymer with a molecular weight of more than 700 thousand AMPS at a temperature of 20°C and below shows the property wypadanie”. The term “wypadanie” characterizes the process of obtaining discussthe AMPS through the jet equipment spillages aircraft, the formation of polymer filaments, that is unacceptable, because the LATTER loses the property of fluidity. In addition, it does not satisfy the requirement for aerodynamic suitability due to insufficient removal from the surface of the aircraft by the air flow.

The invention

The invention consists in the creation of AMPS with high efficiency of removal of ice or prevent ground icing surface of the aircraft in conditions of freezing rain, meet the requirements of international standard ISO 11078.

Offer PLEASE include alkylaryl, corrosion inhibitor, surfactant, water-insoluble additive, thickening agent, a hydroxide of an alkali metal and/or ammonium, and water. As water-insoluble additives AMPS according to the invention contains oleic acid as a thickener contains a copolymer of methyl methacrylate and methacrylic acid.

Copolymer of methyl methacrylate and methacrylic acid contains from 70 to 80 % of methacrylic acid and has an average molecular weight of from 500,000 to 700,000.

Alkylaryl can be a glycol, propylene glycol, glycerin, diethylene glycol, triethylene glycol and/or mixtures thereof.

As the surfactant AFTER the invention contains nonionic surfactants.

In particular, as neyh fatty alcohols of the formula CnH2n+1O(C2H4O)mH, where n=10-18, m=8-10.

As a corrosion inhibitor ECW contains salts of phosphoric and/or nitric acid, in particular alkali metal salts and/or ammonium.

PLEASE according to the invention contains, wt%:

Alkylaryl 25-95

Water 5-75

The corrosion inhibitor of 0.5-2.0

Water-insoluble additive 0,02-1,0

Thickener 0,5-5,0

Surfactants 0,05-1,0

The alkaline hydroxide

metal or ammonium 0,15-2,0

Information confirming the possibility of carrying out the invention

Examples 1-12

Comparative examples 1-6

In a reactor with a stirrer, a jacket and a reflux condenser load 350 kg of water and 10 kg of dinatriumfosfaatti. Include the stirrer and heating. Dissolution of dinatriumfosfaatti hold for 15 minutes while operating the stirrer and a temperature of 60°C. Then load 650 kg of ethylene glycol, 25 kg of a copolymer of methyl methacrylate and methacrylic acid and 5 kg of sodium hydroxide. Their dissolution is carried out for 2 hours. After this time load 5 kg cintanya ALM-10 (mix polyoxyethyleneglycol synthetic esters of primary fatty alcohols) and 5 kg of oleic acid. Within 15 minutes spend their dissolution.

Table 2 shows the composition according to the invention AFTER (A1-A12) and the comparator is s (A1-A12) contains as a binder a water-insoluble copolymer of methyl methacrylate and methacrylic acid, in the process of obtaining the LATTER reacts with the hydroxide of an alkali metal and/or ammonium, forming a water-soluble salt, and as a water-insoluble additives oleic acid.

Table 3 shows basic physical and chemical properties AFTER the invention of the prototype and AFTER according to the invention with exorbitant number of components.

As shown in the table 3 data, increased efficiency in conditions of freezing rain AFTER according to the invention (A1-A12) after mixing with a speed of 3500 rpm for 5 minutes compared with the prior art (comparative examples C1 and C2) is provided by introducing into the composition after the thickener, which represents a copolymer of methyl methacrylate and methacrylic acid, and water-insoluble additives, representing oleic acid. When the content of alkalophile 25 wt.% enter the maximum content of additives, corrosion inhibitor, a thickening agent, a hydroxide of alkali metals, ammonium hydroxide and the lowest content of water-insoluble additives and surfactants, and when the content of alkalophile 95 wt.% - the minimum content of the additive corrosion inhibitor, a thickening agent, a hydroxide of an alkali metal or ammonium and the maximum plane of the air flow (wind suitability).

When the beyond a reduced content of components (comparative examples C3 and C5) shelf life and effectiveness AFTER in icing conditions is reduced.

With exorbitant high content of components (examples C4 and C6) of the composition are stratified within 1-3 months, which makes it impossible for its industrial use as storage time AFTER shall be not less than 2 years. PLEASE according to the invention has the following physical and chemical properties:

Density at 20°C, g/cm31,050-1,100

PH, pH 7,0-7,5

Kinematic viscosity

at 20°C, mm2/230-350

Flash point, °C 120-130

The onset temperature

crystallization, °C, not above

concentrate 32

- when diluted with water 50:50 by volume 10

Preservation properties AFTER after heating at 70°C for 30 days.

Property preservation diluted with water 50:50 by volume AMPS after heating at 95°C for 30 days.

Dynamic viscosity at 20°C and a shear rate of 5.6 with-1MPawith, 4550-6300.

The change in dynamic viscosity after mixing with a speed of 3500 rpm for 5 minutes not more than ±10%.

The efficiency is about rain, min, not less than 30.

Toxicity: lethal dose when injected into the stomach LD50mg/kg:

ECW-based glycol 10000

PLEASE propylene 22000

Hazard class effect on the human body 4.

PLEASE according to the invention is superior to the prototype efficiency in icing conditions and maintaining liquid properties after exposure to temperatures of 70 and 95°C for 30 days.

PLEASE according to the invention meets all the requirements of international standard ISO 11078.

With the introduction AFTER the invention of oleic acid as a water-insoluble additive and a copolymer of methyl methacrylate and methacrylic acid as a thickener received an unexpected effect of reducing the stability of the foam, increasing the viscosity of the ECW, and effectiveness in AFTER the icing conditions.

Claims

1. De-icing fluid to remove ice accumulation and/or prevention of ground icing of aircraft, including alkylaryl, corrosion inhibitor, a nonionic surface-active agent (surfactant), water-insoluble additive, thickening agent, a hydroxide of an alkali metal and/or ammonium and water, characterized in that as water is acrylaway acid, contains 70 - 80% of methacrylic acid with an average molecular weight of from 500,000 to 700,000.

2. De-icing fluid under item 1, in which as alkalophile use polyhydric alcohol containing 2 to 6 carbon atoms.

3. De-icing fluid under item 2, in which alkylaryl represents ethylene glycol, propylene glycol, glycerin, diethylene glycol, triethylene glycol and/or mixtures thereof.

4. De-icing fluid under item 1, in which the nonionic surfactant is a monoalkyl ethers of polyethylene glycol on the basis of primary fatty alcohols of the formula CnH2n+1O(C2H4O)mH, where n=10-18, m=8-10.

5. De-icing fluid under item 1, in which the corrosion inhibitor use salts of phosphoric and/or nitric acid.

6. De-icing fluid under item 5, in which the salt of phosphoric and/or nitric acids are alkali metal salts and/or ammonium.

7. De-icing fluid under item 1, in which oleic acid is contained in an amount of 0.02 to 1.0 wt.%.

8. De-icing fluid under item 1, in which the copolymer of methyl methacrylate and methacrylic acid is contained in the amount of 0.5-5.0 wt.%.

9. Protiva entellina fluid under item 1, in which the corrosion inhibitor is contained in an amount of 0.5-2.0 wt.%.

11. De-icing fluid under item 1, in which the surfactant is contained in an amount of 0.05 to 1.0 wt.%.

12. De-icing fluid under item 1, in which the hydroxide of an alkali metal and/or ammonium contained in an amount of 0.15-2.0 wt.%.

13. De-icing fluid under item 1, in which the water is contained in the amount of 5-75 wt.%.

 

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