Anti-icing composition

 

(57) Abstract:

Usage: to prevent icing of surfaces of airplanes, ships and other objects. The inventive composition further comprises a gel-like polyethylene oxide, obtained by irradiation of an aqueous solution of polyethylene oxide. The composition contains, wt%: propylene glycol 50-55, water 42-48, gel-like polyethylene oxide 0,2-3,0, surfactant is ethoxylated op, the controller pH of 1.5. Technical result: the creation of the anti-icing composition with easily obtainable and relatively cheap thickener, providing reliable protection of surfaces satisfying the requirements of the current regulations to the characteristics of runoff and enable its application on a protected surface with the aid of the ordinary means of sputtering.

The invention relates to anti-icing compositions based on glycols and water, used to prevent icing of surfaces of airplanes, ships and other objects.

Known anti-icing compositions based on glycols and water.

For example, in the United Kingdom patent 1026150, IPC C 09 K 3/18, 1966, described protivoobledinitelnoy as surfactants and corrosion inhibitors.

The main disadvantage of known composition - a little while protecting the surface from freezing is due to its low viscosity.

With the aim of increasing the viscosity and a corresponding increase in protection time period of heat exchange surfaces from freezing in the compositions added thickeners. The most widely as a thickening agent used is a water-soluble structured acripolymer, see, for example, U.S. patents 4358389, IPC C 09 K 3/18, 1982 and EP 0231869, IPC C 09 K 3/18, 1988

These high viscosity compositions have good adhesion with the aerodynamic surfaces of the aircraft and provide an acceptable practice for the protection of surfaces from freezing, but at the same time, their fluidity under the forces of wind shear at take-off speed of the plane is almost not changed and remains fairly low, so the characteristics of runoff is known compositions do not satisfy the requirements of the practice.

In addition, due to the high viscosity of compositions containing a known thickeners, for pumping and spraying requires expensive equipment.

Known anti-icing composition but the U.S. patent 5817252, IPC C 09 K 3/18, 1998, soinali) 0,18, thickener (polycarboxylate) 0,184 and pH regulator (the hydroxides of alkali metals).

This composition provides sufficient long-term protection of surfaces from freezing, but its rheological characteristics do not meet the requirements for de-icing compositions. Also used in a known structure as a thickener structured polycarboxylate get through a complex multistage reactions.

Thus, currently known anti-icing compositions according to its technical characteristics are far from ideal that encourages work on their improvement, mainly due to the receipt of new types of thickeners.

The present invention is the creation of a de-icing composition with easily obtainable and relatively cheap thickener, providing reliable protection of surfaces satisfying the requirements of the current regulations to the characteristics of runoff and enable its application on a protected surface with the aid of the ordinary means of sputtering.

This task is solved in that the de-icing composition containing about what asny polyethyleneoxide, obtained by irradiation of an aqueous solution of polyethylene oxide.

As surface-active substances are used, for example, the ethoxylated octyl - and nonylphenols, pH regulator are potassium hydroxide, ammonium phosphate.

Named parts (components) contained in the anti-icing composition in the following weight ratios, %:

Propylene glycol - 50-55

Water - 42-49

Gel-like polyethylene oxide - 0,2-3,0

Else - 1,5

The proposed anti-icing composition through the use of a new type of thickener - gel polyethylene oxide has distinct properties of non-Newtonian fluids at low shear rates (static position of the aircraft) has a higher viscosity (10000-20000 SP/cm), at high shear rates (during the spraying process and at the takeoff speed of the plane) is a small viscosity.

Thus, the claimed anti-icing composition provides regulated by ISO 11078 time protect the surface from freezing.

In addition, the low viscosity anti-icing composition at high shear rates allows to execute processing for the x terms on the aircraft simulators planes - dural plates length 240 cm, width of 40 cm and a thickness of 2 mm, installed at an angle of 15orelative to the horizon.

In the process of testing the above simulators were cooled to a temperature of minus 10oFrom then on their surface was applied subjects PIC. Measured the length of time between application of the composition and the beginning of the freezing surfaces imitators (the defense). The temperature during the entire time of the test was maintained at minus 10oC, humidity 70%.

Tested two types of SETTLEMENT.

1. The inventive composition 1, containing the weight. %: propylene glycol 50, water 47, gel-like polyethylene oxide of 1.5, a surfactant, a pH regulator 1,5.

2. The inventive composition 2 containing the weight. %: 51 propylene glycol, water 46,5, gel-like polyethylene oxide 1,0, a surfactant, a pH regulator 1,5.

Test results time anti-icing was 2.8 h and 3.0 h, respectively, for compounds 1 and 2.

Known anti-icing means, such as regular anti-icing fluid "CLARIANT" protects surfaces from freezing within 2 hours

In addition, testing of salestax.

The test results are considered satisfactory.

Anti-icing composition comprising propylene glycol, water, surfactant, which is used as ethoxylated op, and a pH Adjuster, characterized in that it further comprises a gel-like polyethylene oxide, obtained by irradiation of an aqueous solution of polyethylene oxide, in the following ratio, wt.%:

Propylene glycol 50-55

Water 42-48

Gel-like polyethylene oxide 0,2-3,0

Surface-active agent and a pH Adjuster 1,5

 

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