Aircraft deicing and anti-icing fluid thickened by compounding alkyl alcohol amine / polyoxyethylene ether surfactant as well as preparation method and application of aircraft deicing and anti-icing fluid

Abstract

The invention discloses an airplane deicing and anti-icing fluid for compounding and thickening an alkyl alcohol amine / polyoxyethylene ether surfactant and a preparation method of the airplane deicing and anti-icing fluid. The deicing and anti-icing fluid for the airplane comprises the following components in parts by mass: 33-60 parts of alcohol, 39-64.27 parts of deionized water, 1-9 parts of an alkyl alcohol amine surfactant and 1-9 parts of a polyoxyethylene ether surfactant, wherein the mass ratio of the alkyl alcohol amine surfactant to the polyoxyethylene ether surfactant is (1-10): 1. The alkyl alcohol amine surfactant and the polyoxyethylene ether surfactant in the deicing and anti-icing fluid are nonionic surfactants, and the molecular structure does not contain any ion head group. The alkyl alcohol amine surfactant is weakly ionized after being solvated, the polyoxyethylene ether surfactant cannot be ionized, the overall charge effect is further weakened after a compound system is formed, metal cannot be corroded, and good compatibility is achieved. The problems that the deicing and anti-icing fluid easily forms hydrated gel on the surface of an airplane and corrodes the surface of the airplane are solved.

Description

Technical Field

[0001] The invention belongs to the field of deicing and anti-icing, and in particular relates to a deicing and anti-icing liquid for the outer surface of an aircraft and a preparation method thereof. Background Art

[0002] Ice on the surface of an aircraft is a major hidden danger to flight safety. For some extremely low-temperature airports, frost is easily accumulated on the wings, engine air intakes and other parts of the aircraft during ground parking. Ice crystals not only increase the weight of the aircraft, but also affect the flight dynamics of the aircraft. In severe cases, they cause safety hazards and lead to aircraft crashes. Therefore, aviation systems around the world require that the ice and snow on the surface of the aircraft be cleaned before taking off. At present, physical deicing technologies include mechanical deicing, gas-heat anti-icing, electric-heat anti-icing and the use of anti-icing materials. However, physical methods consume a lot of energy and have complex modules, which is not conducive to ground deicing and anti-icing operations. The most effective ground deicing and anti-icing fluid method is a chemical method, that is, the use of non-Newtonian fluid deicing and anti-icing fluid, which can effectively remove ice and snow while preventing new ice from forming. The international aviation industry generally uses alcohol / water mixtures thickened by water-soluble polymers to prepare non-Newtonian deicing and anti-icing fluids. These polymers include synthetic and natural polymers, such as polyacrylic acid and its derivatives, xanthan gum, guar gum and fiber. Although most of the de-icing and anti-icing fluid will be blown away by the wind during high-speed flight, a small amount of residue may still be left. These residues are easy to reabsorb water to form hydrated gels, and freeze at sub-zero temperatures at an altitude of 10,000 meters, which may cause rudder jamming problems in key parts and pose a safety hazard. Although the commonly used polymer thickeners on the market can provide good thickening effects, their rheological properties are not ideal, their viscosity is not very stable, and they are difficult to completely blow off due to their strong elasticity, and are more likely to form hydrated gels.

[0003] How to significantly reduce or even avoid the use of polymers in aircraft deicing and anti-icing fluids is an effective way to solve the above problems. The patent application with publication number CN106883819A discloses "a deicing and anti-icing fluid based on ultra-long chain viscoelastic surfactants and its preparation method". This technology uses artificially synthesized ultra-long chain organic acids as raw materials, and its preparation process is complicated, which further increases the cost of the product. In addition, the thickening body is charged on the molecule after solvation, and has a certain degree of corrosiveness. The patent application with publication number CN108441171A discloses "an aircraft deicing and anti-icing fluid thickened with alkyl alcohol amine surfactants and its preparation method". Based on the patent with publication number CN106883819A, it relies on non-ionic surfactants to improve material compatibility. However, in a high-content alkyl alcohol amine surfactant system, the tertiary amine group on the molecular chain will absorb protons, resulting in a higher solution alkalinity. Summary of the invention

[0004] The purpose of the present invention is to provide an aircraft deicing and anti-icing fluid thickened by a composite of alkyl alcohol amine / polyoxyethylene ether surfactant and a preparation method thereof in view of the deficiencies in the prior art, so as to solve the problem that the deicing and anti-icing fluid is easy to form a hydrated gel on the aircraft surface and causes corrosion to the aircraft surface, and obtain a deicing and anti-icing fluid with stable performance, simple preparation and low cost.

[0005] In this specification, the “ / ” in “alkyl alcohol amine / polyoxyethylene ether surfactant” means that alkyl alcohol amine and polyoxyethylene ether are compounded and used as thickeners.

[0006] The aircraft deicing and anti-icing fluid thickened by compounding alkyl alcohol amine / polyoxyethylene ether surfactant of the present invention has the following components and the mass fractions of each component: 33-60 parts by weight of alcohol, 39-64.27 parts by weight of deionized water, 1-9 parts by weight of alkyl alcohol amine surfactant, 1-9 parts by weight of polyoxyethylene ether surfactant, and the mass ratio of the alkyl alcohol amine surfactant to the polyoxyethylene ether surfactant is (1-10):1.

[0007] The alkylolamine surfactant is at least one of the alkylolamine surfactants having the following structural formula 1.

[0008] Structural formula 1

[0009] In the general structural formula, n is 1 to 5, m is 1 to 5, p is 6 to 18, p is 6 to 18, and n, m, p, and q are all integers.

[0010] The polyoxyethylene ether surfactant is at least one of the polyoxyethylene ether surfactants having structural formulas 2 and 3.

[0011] Structural formula 2

[0012] In the general structural formula 2, n is 1 to 5, m is 7 to 8, 9 to 10 or 11 to 12, and n and m are both integers.

[0013] Structural formula 3

[0014] In the general structural formula 3, n is 1 to 5, m is 7 to 8, 9 to 10 or 11 to 12, and n and m are both integers.

[0015] In the above technical solution of the present invention, further, the alkyl alcoholamine surfactant is preferably octadecyl diethanolamine.

[0016] In the above technical solution of the present invention, further, the polyoxyethylene ether surfactant preferably satisfies at least one of Triton X-144 (n=7, 8), Triton X-100 (n=9, 10) satisfying the general structural formula 2, and lauryl alcohol polyoxyethylene ether satisfying the general structural formula 3.

[0017] In the above technical solution of the present invention, further, the alcohol is at least one of a divalent alkyl alcohol having 2 to 5 carbon atoms and a polyvalent alkyl alcohol having 2 to 5 carbon atoms. The divalent alkyl alcohol is preferably 1,2-propylene glycol.

[0018] In the above technical solution of the present invention, further, the mass ratio of the alkyl alcohol amine surfactant to the polyoxyethylene ether surfactant is preferably 1:1, 2:1, 5:1, or 10:1.

[0019] In the above technical solution of the present invention, further, the compounding ratio of the alkyl alcoholamine surfactant octadecyl diethanolamine and Triton X-100 is preferably (2-10):1, more preferably 2:1.

[0020] In the above technical solution of the present invention, further, calculated based on 100 parts by volume, the volume ratio of water to alcohol is preferably 50:50 to 70:30, more preferably 50:50.

[0021] The present invention also provides a method for preparing the aircraft deicing and anti-icing fluid thickened by the above-mentioned alkyl alcohol amine / polyoxyethylene ether surfactant compound: Deionized water and alcohol were mixed and stirred in a volume fraction ratio, and then alkyl alcohol amine surfactant and polyoxyethylene ether surfactant were added. After accelerated dissolution at an ambient temperature of 80°C for 4 hours, the mixture was placed in an ambient temperature of 25°C to cool.

[0022] The present invention also provides a combined application of alkyl alcohol amine and polyoxyethylene ether surfactant in aircraft deicing and anti-icing fluid. Further, the application is as a compound thickener.

[0023] In the above technical solutions of the present invention, the surfactants are all existing products and can be purchased on the market.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. The alkyl alcohol amine surfactant and the polyoxyethylene ether surfactant in the deicing and anti-icing fluid of the present invention are both non-ionic surfactants, and do not contain any ionic head groups in their molecular structures. The alkyl alcohol amine surfactant is weakly ionized after solvation, and the polyoxyethylene ether surfactant will not be ionized. After forming a composite system, the overall charge effect is further weakened, and the metal will not be corroded, and the system has good compatibility.

[0025] 2. The deicing and anti-icing fluid of the present invention has simple ingredients and is easy to prepare. The surfactants can be purchased on the market. It has stable performance, is simple to prepare, and has low cost.

[0026] 3. After the surfactant of the deicing and anti-icing fluid of the present invention forms lamellar micelles through self-assembly, the aqueous solution will show the viscoelasticity of the polymer solution and the apparent viscosity will increase. Due to its non-Newtonian fluid properties, it is easier to adhere to the surface of the object and show shear thinning properties, which meets the requirements of deicing and anti-icing fluid.

[0027] 4. The deicing and anti-icing fluid of the present invention has low elasticity, is easy to blow off under shearing action, has low residue and is difficult to form hydrated gel, thus avoiding the safety problems caused by the formation of hydrated gel by existing deicing and anti-icing fluids.

[0028] 5. The freezing point of the deicing and anti-icing fluid of the present invention can be adjusted by changing the type and content of alcohol, and has a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 3 is a viscosity-shear rate relationship diagram of the four deicing and anti-icing fluids in Example 1 at 20°C (a) and -20°C (b) (in the figure, SDA represents octadecyl diethanolamine, TX-100 represents Triton X-100, TX-114 represents Triton X-114, and DAPE represents lauryl alcohol polyoxyethylene ether).

[0030] Figure 2 4 is a viscosity-shear rate relationship diagram of the deicing and anti-icing fluid of Example 2 at different temperatures.

[0031] Figure 3 This is a viscosity-shear rate relationship diagram of deicing and anti-icing at different compounding ratios of octadecyl diethanolamine and Triton X-100 in Example 3.

[0032] Figure 4 It is a diagram of small-angle neutron scattering results of the four deicing and anti-icing fluids in Example 4 (a is the scattering curves of the four deicing and anti-icing fluids, and b is a diagram of the layer structure thickness corresponding to the four deicing and anti-icing fluids).

[0033] Figure 5 The following are the small angle neutron scattering results of the deicing and anti-icing fluid in Example 5 at different temperatures (a is the scattering curve of the deicing and anti-icing fluid at different temperatures, and b is the corresponding layer structure thickness diagram at different temperatures).

[0034] Figure 6 This is a small angle neutron scattering result diagram of the deicing and anti-icing fluids with four different compounding ratios of octadecyl diethanolamine and Triton X-100 in Example 6. (a is the scattering curve of the deicing and anti-icing fluids with different compounding ratios, and b is the layer structure thickness diagram corresponding to the deicing and anti-icing fluids with different compounding ratios) Figure 7 These are the small-angle neutron scattering results of three deicing and anti-icing fluids at different water / 1,2-propylene glycol (30 / 70, 50 / 50, 70 / 30) volume ratios in Example 7 (a is the scattering curve of deicing and anti-icing fluids with different compounding ratios of different water / 1,2-propylene glycol volume ratios, and b is the corresponding layer structure thickness diagram).

[0035] Figure 8 The graph shows the anti-icing conditions and anti-icing time of the four deicing and anti-icing fluids in Example 8 (one pure solvent, and three with a compound thickener added) in a -5°C continuous spraying water mist environment.

[0036] Fig. 9 This is a surface observation picture of the AMS aluminum alloy plate after the deicing and anti-icing liquid in Example 9 is applied to the AMS2024 aluminum alloy plate and then dried and repeatedly hydrated.

[0037] Fig.10 The following is a comparison of the apparent states of the AMS 4376 aluminum-magnesium alloy test plate and the low-brittle cadmium-plated test plate in the aircraft de-icing and anti-icing fluid thickened by the compound of octadecyl diethanolamine and Triton X-100 (a), in the de-icing and anti-icing fluid diluted 50% by volume (a), and after full immersion for 24 hours (b). DETAILED DESCRIPTION

[0038] The aircraft deicing and anti-icing fluid thickened by compounding an alkyl alcohol amine / polyoxyethylene ether surfactant and the preparation method thereof are further described below by way of examples.

[0039] In the following examples, the surfactants and alcohols used were purchased from commercial reagent companies.

[0040] Example 1

[0041] In this embodiment, there are 4 kinds of deicing and anti-icing fluids, and their formulas are as follows:

[0042] Preparation: Add the formulated amount of 1,2-propylene glycol to deionized water at room temperature, then add octadecyl diethanolamine and the formulated amount of Triton X-100, Triton X-114 or lauryl alcohol polyoxyethylene ether, heat to 80°C and stir until the surfactant is completely dissolved to obtain a deicing and anti-icing fluid.

[0043] The relationship between the apparent viscosity and shear rate of the above deicing and anti-icing fluids was measured at 20°C and −20°C using a rotational rheometer (Anto Paar, MCR 302e). The results are shown in Figure 2. Figure 1 As shown. Figure 1It can be seen that the de-icing and anti-icing fluid exhibits a higher apparent viscosity at low shear rates, and as the shear rate increases, the viscosity decreases, that is, it exhibits shear-thinning characteristics, which meets the rheological performance requirements of non-Newtonian fluid de-icing and anti-icing fluids. Among them, the de-icing and anti-icing fluid thickened by the compound of octadecyl diethanolamine and Triton X-100 has significantly higher viscosity and stronger shear-thinning effect, indicating that the de-icing and anti-icing fluid can form a more stable liquid film on the surface of the aircraft wing, and at the same time, it is easier to be blown off under a certain wind speed shear when the aircraft takes off, thereby achieving "stable adhesion and low residue".

[0044] Example 2

[0045] In this embodiment, the composition ratio of the deicing and anti-icing fluid is the same as that of the deicing and anti-icing fluid thickened by compounding octadecyl diethanolamine and Triton X-100 in Embodiment 1, and the preparation method is the same as that in Embodiment 1.

[0046] The relationship between the apparent viscosity and shear rate of the deicing and anti-icing fluid thickened by octadecyl diethanolamine and Triton X-100 was measured using a rotational rheometer (Anto Paar, MCR 302) at 40°C, 20°C, 0°C, and −20°C. The results are shown in Figure 2 As shown. Figure 2 It can be seen that the deicing and anti-icing fluid exhibits a higher apparent viscosity and a stronger shear-thinning effect in a low-temperature environment. This shows that the non-Newtonian deicing and anti-icing fluid has good adaptability to different temperatures, and exhibits a higher viscosity and a stronger shear-thinning effect in a sub-zero low-temperature extreme environment, indicating that the deicing and anti-icing fluid can form a more stable liquid film at low temperatures and is more easily blown off by strong wind shear during takeoff.

[0047] Example 3 In this embodiment, there are 4 kinds of deicing and anti-icing fluids. The first kind has the same component ratio as the deicing and anti-icing fluid compounded with octadecyl diethanolamine and Triton X-100 in Embodiment 1 (the weight ratio of octadecyl diethanolamine to Triton X-100 is 2:1). The weight ratios of octadecyl diethanolamine to Triton X-100 in the other 3 kinds of deicing and anti-icing fluids are 10:1, 5:1, and 1:1, respectively. The other component ratios are the same as in Embodiment 1, as shown in the table below.

[0048]

[0049] Preparation: Add the formulated amount of 1,2-propylene glycol to deionized water at room temperature, then add octadecyl diethanolamine and Triton X-100 in the formulated weight ratio, heat to 80°C and stir until the surfactant is completely dissolved to obtain a deicing and anti-icing fluid.

[0050] The relationship between the apparent viscosity and shear rate of the above deicing and anti-icing fluids was measured at 20°C using a rotational rheometer (Anto Paar, MCR 302e). The results are as follows: Figure 3 As shown. Figure 3 It can be seen that the deicing and anti-icing fluids with different compounding ratios of octadecyl diethanolamine and Triton X-100 all show high apparent viscosity, and as the shear rate increases, the viscosity decreases, that is, it shows shear thinning characteristics, which meets the rheological property requirements of non-Newtonian fluid deicing and anti-icing fluids. Among them, the deicing and anti-icing fluid with a weight ratio of octadecyl diethanolamine to Triton X-100 of 2:1 has more considerable viscosity and shear thinning effect, indicating that the deicing and anti-icing fluid can form a more stable liquid film and is easier to be blown off under shear.

[0051] Example 4 In this embodiment, the composition ratio of the four deicing and anti-icing fluids is the same as that in Embodiment 1, and the preparation method is the same as that in Embodiment 1.

[0052] The solution structures of the four deicing and anti-icing fluids were characterized at 20°C using a small angle neutron scattering spectrometer (CSNS). Figure 4 As shown. Figure 4 It can be seen that the octadecyl diethanolamine solution and the mixed solution of octadecyl diethanolamine solution and polyoxyethylene ether surfactant all formed long-range ordered layered structures, and the distance between the structural layers in the mixed solution was shorter, and the formed ordered structure was more dense. This shows that the viscosity increase caused by the addition of polyoxyethylene ether surfactant is caused by the need to overcome greater relative friction resistance for the interaction between denser layers in the solution; however, as the shear rate increases, the mutation caused by the destruction of the multilayer structure is greater, so the shear thinning effect is stronger.

[0053] Example 5 In this embodiment, the composition ratio of the deicing and anti-icing fluid is the same as that of the deicing and anti-icing fluid thickened by compounding octadecyl diethanolamine and Triton X-100 in Embodiment 1, and the preparation method is the same as that in Embodiment 1.

[0054] The solution structure of the above-mentioned Triton X-100 compound deicing and anti-icing fluid was measured by small angle neutron scattering spectrometer (CSNS) at 20℃, 0℃, and −20℃. The results are as follows: Figure 5 As shown. Figure 5 It can be seen that the layered structure in the solution remains stable under different temperature environments. In addition, lowering the temperature is conducive to the formation of a denser layered structure. This result corresponds to the macro-rheological performance results in Example 2, indicating that the dense layered structure formed by octadecyl diethanolamine and Triton X-100 described in Example 1 can give the solution high viscosity and strong shear thinning effect, which is also the key to the effective performance of the compound deicing and anti-icing fluid.

[0055] Example 6 In this embodiment, the composition ratio of the four deicing and anti-icing fluids is the same as that in Embodiment 3, and the preparation method is the same as that in Embodiment 1.

[0056] The solution structures of the four ice deicing fluids were characterized at 20°C using a small angle neutron scattering spectrometer (CSNS). Figure 6 As shown. Figure 6 It can be seen that a layered structure is formed in the deicing and anti-icing fluid at different compounding ratios. In addition, the layered structure becomes loose first and then dense as the content of Triton X-100 increases; this is because at low concentrations, due to the long hydrophilic structure of Triton X-100, the increase in its content will significantly enhance the solvophobic interaction of the system, thereby shortening the interlayer spacing and making the layered structure dense; but when the weight of Triton X-100 is as high as 0.375, the content of octadecyl diethanolamine is too low to effectively arrange in opposite directions to form a double-layer structure. This result corresponds to the macroscopic rheological performance results in Example 3. Preferably, the compounding ratio of octadecyl diethanolamine to Triton X-100 can be concentrated in 2:1~10:1. When the compounding ratio is 2:1, the effect is optimal.

[0057] Example 7 In this embodiment, the formula of the deicing and anti-icing fluid is as follows:

[0058] Preparation: Add the formulated amount of 1,2-propylene glycol to deionized water at room temperature, then add octadecyl diethanolamine and Triton X-100 in the formulated weight ratio, heat to 80°C and stir until the surfactant is completely dissolved to obtain a deicing and anti-icing fluid.

[0059] The solution structures of the deicing and anti-icing fluid prepared with Triton X-100 in Example 1 and the above two deicing and anti-icing fluids were characterized at 20°C using a small angle neutron scattering spectrometer (CSNS). The results are as follows: Figure 7 As shown. Figure 7 It can be seen that after octadecyl diethanolamine and Triton X-100 were compounded, they assembled into a layered structure in mixed solvents with different alcohol contents; and as the alcohol content increased, the ability of the mixed solvent to induce the surfactant to self-assemble weakened, which led to an increase in the spacing between the double-layer structure and the layered structure became sparse after swelling. This shows that thanks to the dense layered structure of the deicing and anti-icing fluid at low alcohol content, it can achieve higher viscosity and stronger shear thinning effect.

[0060] Example 8 The components of the deicing and anti-icing fluid without thickener in this embodiment, and the content of each component are shown in the following table. In addition, there are three kinds of deicing and anti-icing fluids containing octadecyl diethanolamine and Triton X-100, which are the deicing and anti-icing fluids compounded with Triton X-100 in Example 1, and the two deicing and anti-icing fluids in Example 7.

[0061]

[0062] The water mist durability anti-icing test (WEST) was conducted with reference to BG / T 20857-2012 "Aircraft Non-Newtonian De-icing and Anti-icing Fluid Type II, III and IV" issued by the Standardization Administration of China in 2013, and the "Aerospace Technical Standard (Aerospace Standard) AS5901" issued by the Society of Automotive Engineers in 2014, and the "Aerospace Technical Standard AS5900 TM" issued in 2016. The water mist durability test was carried out on the experimental platform independently built by the Civil Aviation Administration of China Test Center. The specific process is to evenly apply the solution sample on a 10 cm´5 cm aviation-specific super-smooth AMS2024 aluminum alloy test plate, and tilt the aluminum alloy plate (about 10 degrees from the horizontal) o The aluminum alloy test plate was placed in a low-temperature test chamber with a continuous water mist spray nozzle. The experimental temperature was set to −5 °C and the water mist spray intensity was 5.0 g / dm / h. After the experiment started, the water mist was turned on and the spray continuously hit the surface of the aluminum alloy test plate in the form of water droplets. The time when the anti-icing effect on the surface of the test plate failed and ice formed under this condition was recorded. The experiment was repeated four times and the average value was taken as the final result. The final result is as follows Figure 8 shown.

[0063] Depend on Figure 8 It can be seen that in the absence of a compound thickener, the anti-icing time is only 5 minutes, because the liquid viscosity is low and an effective anti-icing liquid film cannot be formed. However, after adding octadecyl diethanolamine and Triton X-100 compound thickeners to mixed solvents with different water / 1,2-propylene glycol ratios (30 / 70, 50 / 50, 70 / 30), the anti-icing time increases to varying degrees. Among them, when the water content is as high as 70vol%, the freezing point of the system is high, so the anti-icing ability is not significantly enhanced. However, with the increase of the content of 1,2-propylene glycol, the anti-icing time increases effectively. The anti-icing time is 35min and 31min at an alcohol content of 50vol% and 70vol%, respectively, which meets the requirements for type II non-Newtonian deicing and anti-icing fluids in the national standard G / T 20857-2012 "Aircraft Non-Newtonian Deicing and Anti-icing Fluids Type II, III, and IV".

[0064] Example 9 The components, contents of each component and preparation method of the deicing and anti-icing fluid v in this embodiment are the same as those of the deicing and anti-icing fluid thickened by compounding octadecyl diethanolamine and Triton X-100 in Example 1.

[0065] A high-speed camera was used to observe the formation of hydrogel by de-icing and anti-icing fluid. First, the AMS2024 aluminum alloy test plate was fully immersed in the de-icing and anti-icing fluid sample, taken out within 4 seconds, and hung on the bracket. After repeating this process 6 times, it was placed in an environment of 30-35°C to dry, and the camera was used to observe whether residue was formed on the surface of the metal plate. Then, the test plate was fully immersed in deionized water, hydrated for 30 seconds, taken out and hung for 60 seconds, and the process was repeated 10 times. Finally, the camera was used to observe the formation of hydrated gel on the surface of the metal plate. The results are as follows: Fig. 9 As shown, the above deicing and anti-icing fluid forms less residue and no obvious hydrated gel is formed after repeated hydration.

[0066] Example 10 The components, contents of the components and preparation method of the deicing and anti-icing fluid in this embodiment are the same as those of the deicing and anti-icing fluid thickened by compounding octadecyl diethanolamine and Triton X-100 in Embodiment 1.

[0067] AMS 4376 magnesium alloy (dichromate oxidation) and low-brittle cadmium-plated test plates of specified size were selected for full immersion corrosion test. During the test, the test plate was fully immersed in the deicing and anti-icing fluid thickened by octadecyl diethanolamine and Triton X-100, as well as the deicing and anti-icing fluid diluted by 50% by volume. After 24 hours, the changes in the apparent state of the observation period and the changes in the weight of the weighed test plate were observed. The apparent state results are as follows: Fig.10 As shown. Fig.10 It can be seen that the appearance of the two test plates did not change significantly after being immersed in the undiluted and diluted de-icing and anti-icing fluids for 24 hours. The weight changes are shown in the following table, and the results show that no significant changes were found in the test plates after full immersion. The above results show that the de-icing and anti-icing fluid thickened by the compound of octadecyl diethanolamine / Triton TX-100 has low corrosion to aircraft metals and has good material compatibility.

[0068]

Claims

1. Aircraft thickened with alkyl alcohol amine / polyoxyethylene ether surfactant compound Deicing and anti-icing fluid, characterized in that Its components and the mass percentage of each component are as follows: 33-60 parts by weight of alcohol, 39-64.27 parts by weight of deionized water, 1-9 parts by weight of alkyl alcohol amine surfactant, 1-9 parts by weight of polyoxyethylene ether surfactant, and the mass ratio of the alkyl alcohol amine surfactant to the polyoxyethylene ether surfactant is (1-10):1; The alkyl alcohol amine surfactant is at least one of the alkyl alcohol amine surfactants having the following structural formula 1: Structural formula 1 , In the general structural formula, n is 1 to 5, m is 1 to 5, p is 6 to 18, p is 6 to 18, and n, m, p, and q are all integers; The polyoxyethylene ether surfactant is at least one of the polyoxyethylene ether surfactants having structural formula 2 and 3, Structural formula 2 , In the general structural formula 2, n is 1 to 5, m is 7 to 8, 9 to 10 or 11 to 12, and n and m are both integers; Structural formula 3 , In the general structural formula 3, n is 1 to 5, m is 7 to 8, 9 to 10 or 11 to 12, and n and m are both integers.

2. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: The alkyl alcohol amine surfactant is preferably octadecyl diethanolamine.

3. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: The polyoxyethylene ether surfactant is selected from at least one of Triton X-144 satisfying the general structural formula 2, wherein n=7, 8, Triton X-100, wherein n=9, 10, and lauryl alcohol polyoxyethylene ether satisfying the general structural formula 3.

4. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: The alcohol is at least one of a divalent alkyl alcohol having 2 to 5 carbon atoms and a polyvalent alkyl alcohol having 2 to 5 carbon atoms.

5. The aircraft deicing and anti-icing fluid according to claim 4, characterized in that: The dihydric alkyl alcohol is 1,2-propylene glycol.

6. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: The mass ratio of the alkyl alcohol amine surfactant to the polyoxyethylene ether surfactant is 1:1, 2:1, 5:1 or 10:

1.

7. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: The compounding ratio of the alkyl alcoholamine surfactant octadecyl diethanolamine and Triton X-100 is preferably (2-10):

1.

8. The aircraft deicing and anti-icing fluid according to claim 1, characterized in that: Calculated based on 100 parts by volume, the volume ratio of water to alcohol is preferably (50-70):(50-30).

9. The preparation method of the aircraft deicing and anti-icing fluid thickened by compounding alkyl alcohol amine / polyoxyethylene ether surfactant according to claim 1: Deionized water and alcohol were mixed and stirred in a volume fraction ratio, and then alkyl alcohol amine surfactant and polyoxyethylene ether surfactant were added. After accelerated dissolution at an ambient temperature of 80°C for 4 hours, the mixture was placed in an ambient temperature of 25°C to cool.

10. Combined application of alkanolamine and polyoxyethylene ether surfactant in aircraft deicing and anti-icing fluid.

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