De-icing fluid

 

(57) Abstract:

The invention relates to compositions of de-icing fluid to remove ice accumulation (frost, hoarfrost, snow, ice) from the surface of the aircraft, as well as prevent re-ground icing of aircraft on the stage of their preparation for takeoff. Anti-icing fluid includes 50-55% alkalophile, 0.3 to 0.4% of benzosulfimide methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols, of 0.1-0.2% stearic acid, 0.15 to 0.2% of the Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine, 0.3 to 0.4% technical mixture of polyethylene glycol ethers of monoalkylphenols-based propylene trimer of the following composition: C9H19WITH6H4O(C2H4O)nH, where n is the average number of moles of ethylene oxide attached to one pray ALKYLPHENOLS, n=9-12, as a corrosion inhibitor 0.5 to 1.5% of sodium tetraborate and the rest water. An object of the invention is the creation of de-icing fluid with high efficiency prevent ground icing of aircraft, increased shelf life and low surface tension. table 2. (frost, frost, snow, ice) from the surface of the aircraft, as well as prevent re-ground icing of aircraft on the stage of their preparation for takeoff. The occurrence of ground icing leads to weighting, disbalancing, the distortion of the profile, increase the drag of the aircraft, which can lead to dangerous consequences in terms of safety.

Known anti-icing fluid for treatment of the fuselage, wings and empennage of the aircraft, containing 40-60% of the acetate of an alkali metal, not less than 0.8% of phosphate of an alkali metal, at least 0.015% of a silicate of an alkali metal, not less than 0.01% of aromatic triazole, 0.05 to 0.15% of a water-soluble surfactant - ester alkylarylsulfonate and not less than 0,0005% of water-soluble dye (U.S. patent No. 5435930, Appl. 28.03.94,; IPC: 09 K 3/18).

This fluid has no adverse impact on the environment and is not aggressive towards structural metals and alloys, but has little to prevent the ability for just 4-5 minutes instead of the required 30 minutes for the actual operating conditions of the aircraft.

Known de-icing liquid, a water-glycol is Oh acid (0.01 to 5 wt.%) and having in its composition from 0 to 1 wt.% corrosion inhibitor; from 0 to 2 wt.% surfactant; from 0 to 1 wt.% the base to maintain the pH 7-11 (U.S. patent No. 5750047, Appl. 13.03.97,; IPC 09 K 3/18).

The liquid of this composition effectively prevents icing (not less than 60 min), but its dynamic viscosity reaches a value of 25,000 centipoise, which does not allow to completely removed the protective liquid film during takeoff of the aircraft. This situation has consequences equivalent to the presence of ice forms on the surface of the aircraft during takeoff.

Closest to the proposed invention and adopted us for the prototype is de-icing liquid having the following composition, wt.%:

Alkylaryl 30-95

Disubstituted phosphate of an alkali metal of 0.5-1.5

Bansilalpet methyldecyl aminomethyl derivatives diethylenglycol esters

fatty alcohols 0,5-5,0

Stearic acid 0,1-1,2

Water To 100

(patent RF №2100398 priority from 05.04.93,; IPC 09 K 3/18).

Known anti-icing fluid has a low viscosity at temperatures below zero, but does not meet the technical requirements due to the high values of the surface tension greater than 40 mn/m, small term storage ( An object of the invention is the creation of de-icing fluid with high efficiency prevent ground icing of aircraft, extended shelf life and low surface tension.

The proposed anti-icing fluid containing alkylaryl, corrosion inhibitor, bansilalpet methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols, stearic acid, and water, characterized in that it further comprises a Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine and technical mixture of polyethylene glycol ethers of monoalkylphenols-based propylene trimer of the following composition:

WITH9H19WITH6H4ABOUT(C2H4O)nN

where n is the average number of moles of ethylene oxide attached to pray one of alkyl phenols; n=9-12, and as a corrosion inhibitor contains sodium tetraborate in the following ratio, wt.%:

Alkylaryl 50-55

The corrosion inhibitor of 0.5-1.5

Bansilalpet methyldecyl aminomethyl derivatives diethylenglycol ethers of fatty alcohols of 0.3-0.4

The Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine of 0.15-0.2

The technical mixture of polyethylene glycol ethers of monoalkylphenols 0,3-0,4

Walls is OI a mixture of polyethylene glycol ethers of monoalkylphenols-based propylene trimer not only reduces the surface tension of the composition to the desired values (less than 40 mn/m), but in conjunction with benzosulfimide methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols and Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine, leads to unexpected effect of a significant increase in time to prevent icing and retention of fluid without excessive increase of the viscosity, which is undesirable both from the point of view of the difficulty of applying liquids to the surface, and removal of the protective film of the liquid phase of the takeoff of the plane.

Examples of specific implementation.

Example 1

In a reactor equipped with a stirrer, a jacket for heating or cooling and reflux condenser, download 474 kg of water, 500 kg of 1,2-propylene glycol (TU 2422-069-05766801-97) and 15 kg of sodium tetraborate (GOST 8429-77) include the stirrer and heating. When the temperature of the mixture to 75-80C contents of the reactor are stirred for 15 minutes. Then load consistently 4 kg of benzosulfimide methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols (Alcamo OS-2, GOST 10106-75), 2 kg of the Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine (the Drug farm, is Kerov propylene (TU 2483-077-05766801-98) and 2 kg of stearic acid (GOST 9419-78). After loading each one of these components conduct stirring for 15 minutes at the same temperature, after which the resulting liquid is cooled to a temperature of 20C and unloaded from the reactor.

Similar technology is obtained liquid composition is shown in table 1 (examples 2 and 3).

Table 2 shows the properties of the proposed de-icing fluid in comparison with the prototype.

The notation in table 1:

PG - 1,2 - propylene glycol;

EG - ethylene glycol;

DG - diethylene glycol;

PAGAM - polietilenglikolya esters of monoalkylphenols based trimers of propylene;

DCP - dailypost (potassium phosphate disubstituted trihydrate);

Alcamo OS-2 - bansilalpet methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols;

The drug farm - Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine;

TBN - sodium tetraborate;

SC - stearic acid.

From table 2 it is seen that the proposed anti-icing fluid (examples 1-3) compared with the liquid composition of the prototype (example 4) has a surface tension of the re-10C 2.3-2.7 times greater than the thickness of the protective film of the prototype. Sorption of water vapor at a relative humidity =98% protective films offer liquid composition is 2-3 times lower compared to the same characteristic of the liquid film on the prototype, resulting in efficiency prevent icing of the proposed fluid is 90-108 minutes instead of 35 minutes for the prototype. In addition, the shelf life of the proposed de-icing fluid is significantly greater than that of the prototype, and is 3 years instead of 1 year.

Thus, the proposed anti-icing fluid allows to obtain on the surface of the aircraft protective film with a larger thickness and a low sorption capacity with respect to water vapor, which leads to its high efficiency prevent icing in freezing rain. In addition, the reduction of the surface tension of de-icing fluid improves the wettability of its surface finish, thereby also facilitated the process of removal of the protective film during takeoff of the aircraft.

Use in the formulation of the proposed liquid technical mixture of polyethylene glycol ethers of monoalkylphenols based trimers of propylene instead of expensive individual decision protective film performance of the proposed de-icing fluid in combination with its low corrosion activity leads not only to reduction of material and labor costs for maintenance and repair of aviation equipment but also increases the safety and regularity of flights.

Significant decrease in the content of alkalophile in the composition of the proposed de-icing fluid (55 wt.% instead of 95 wt.% for the composition of the liquid on the prototype) markedly improves Toxicological and ecological conditions in the production and use of liquid.

De-icing fluid containing alkylaryl, corrosion inhibitor, bansilalpet methyldiethanolamine derivatives diethylenglycol ethers of fatty alcohols, stearic acid, and water, characterized in that it further comprises a Quaternary methyl sulfate of the condensation product of stearic acid with diethanolamine and technical mixture of polyethylene glycol ethers of monoalkylphenols-based propylene trimer of the following composition:

WITH9H19WITH6H4O(C2H4O)nH

where n is the average number of moles of ethylene oxide attached to one pray ALKYLPHENOLS;

n=9-12,

and as a corrosion inhibitor contains sodium tetraborate in the following ratio, wt.%:

Alkylaryl 50-55

The corrosion inhibitor of 0.5-1.5

Bensalah CNY the methyl sulfate of the condensation product of stearic acid with diethanolamine of 0.15-0.2

The technical mixture of polyethylene glycol ethers of monoalkylphenols 0,3-0,4

Stearic acid is 0.1-0.2

Water To 100

 

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