A test device for the fog resistance of an anti-fog agent

Abstract

The present application relates to the technical field of anti-fog, in particular to a kind of testing device for fog resistance of anti-fog agent.The testing device comprises cold and hot environment box, windshield test piece and refrigeration and heating device for controlling the internal temperature of cold and hot environment box to rise or fall, and the cold and hot environment box is provided with opening for installing windshield test piece;The box body of cold and hot environment box is sandwich glass structure, and the inside of sandwich glass structure is provided with heat insulation film layer.The purpose of the testing device for fog resistance of anti-fog agent is to solve the problem that existing test method cannot simulate the cold and hot cycle of windshield surface anti-fog agent.

Description

Technical Field

[0001] This invention relates to the field of anti-fogging technology, and more specifically to a testing device for the fog resistance of anti-fogging agents. Background Technology

[0002] During flight, changes in altitude and external climate create significant temperature differences between the inside and outside of the aircraft. Windshields, made of polymer materials, are hydrophobic. When the surface temperature of the windshield drops below its dew point, water vapor in the air forms tiny droplets on its surface, obscuring the view and causing fogging—the condensation of water vapor onto the transparent glass surface. This fogging impairs the pilot's visibility and thus affects aircraft safety. To prevent windshield fogging, anti-fogging agents are widely used.

[0003] Antifog agents are low-molecular-weight dispersants containing hydrophilic groups. They are composed of molecules with a defined molecular weight. When applied to the surface of a transparent object, they form a coating. The hydrophilic groups in the coating can adsorb water molecules in the air, wetting and spreading on the surface of the transparent object to form a water film (rather than water droplets). This prevents light passing through the object from being scattered and avoids fogging.

[0004] When anti-fogging agents are applied to the surface of windshields, existing technologies test the fog resistance of these agents under constant temperature conditions, regardless of whether the cold fog method or the hot fog method is used. However, when the flight altitude of aircraft changes continuously, the anti-fogging agent on the windshield surface is subjected to thermal cycling conditions. If the cold fog method or the hot fog method is still used to test the fog resistance of the anti-fogging agent, it will lead to inaccurate fog resistance test results.

[0005] Therefore, the inventors have provided a testing device for the fog resistance of antifog agents. Summary of the Invention

[0006] (1) Technical problems to be solved

[0007] This invention provides a testing device for the fog resistance of antifog agents, which solves the technical problem that existing testing methods cannot simulate the cold and hot cycling of antifog agents on windshield surfaces.

[0008] (2) Technical solution

[0009] This invention provides a testing device for the anti-fogging properties of an anti-fogging agent, comprising a hot and cold environment chamber, a windshield test piece, and a cooling and heating device for controlling the rise or fall of the internal temperature of the hot and cold environment chamber. The hot and cold environment chamber has an opening for installing the windshield test piece. The chamber body is a laminated glass structure, and the interior of the laminated glass structure is provided with a heat insulation film layer.

[0010] Furthermore, the thermal conductivity of the heat insulation film is 0.02–0.3 W / m·K.

[0011] Furthermore, the heat insulation film layer is made of functional materials, which include the following substances in parts by weight: 10-30 parts of heat insulation material, 0.5-3 parts of composite material, 0.01-0.5 parts of dispersant, 0.5-5 parts of plasticizer, and 70-85 parts of thermoplastic resin.

[0012] Furthermore, the heat insulation material includes titanium dioxide and hollow SiO2 nanofibers, and the mass ratio of the hollow SiO2 nanofibers to the titanium dioxide is 1:(0.1~0.8).

[0013] Furthermore, the mass ratio of the hollow SiO2 nanofibers to the titanium dioxide is 1:(0.4-0.8).

[0014] Furthermore, the titanium dioxide is at least one of rutile, anatase, and plate titanium dioxide.

[0015] Furthermore, the composite material is a mixture of silicone and graphene-encapsulated silicone.

[0016] Furthermore, the cooling and heating device includes at least two sets, with at least one set used only for cooling and at least one set used only for heating.

[0017] Furthermore, the cooling and heating device includes heat insulation cotton, a first radiator, a second radiator, and a cooling plate. The first radiator and the second radiator are respectively connected to both sides of the heat insulation cotton, and the heat insulation cotton has a connection port for placing the cooling plate.

[0018] Furthermore, the cooling and heating device also includes a first fan and a second fan, wherein the second fan is installed on the side of the first radiator away from the insulation cotton, and the first fan is installed on the side of the second radiator away from the insulation cotton.

[0019] (3) Beneficial effects

[0020] In summary, by setting up a heat insulation film layer, the present invention can quickly adjust the temperature of the hot and cold environment chamber to achieve environmental conditions that can simulate the take-off and landing process of aircraft and other flight equipment, thereby enabling more accurate testing of the anti-fogging performance of anti-fogging agents under different temperature conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a testing device for the fog resistance of an anti-fogging agent provided in an embodiment of the present invention;

[0023] Figure 2 This is the book Figure 1 Enlarged view of the structure at point A in the middle;

[0024] Figure 3 This is a schematic diagram of the assembly structure of the cooling element in a testing device for the fog resistance of an anti-fogging agent provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the hot and cold environment chamber in a testing device for the fog resistance of an anti-fogging agent provided in an embodiment of the present invention.

[0026] In the picture:

[0027] 1-Hot and cold environment chamber; 2-Windshield test piece; 3-Refrigeration and heating device; 301-First fan; 302-Insulation cotton; 303-First radiator; 304-Second fan; 305-Second radiator; 306-Refrigeration chip. Detailed Implementation

[0028] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention. That is, the present invention is not limited to the described embodiments, and any modifications, substitutions and improvements to the parts, components and connection methods are covered without departing from the spirit of the present invention.

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0032] Figure 1 This is a schematic diagram of the structure of a testing device for the fog resistance of an anti-fogging agent provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the device may include a hot and cold environment chamber 1, a windshield test piece 2, and a cooling and heating device 3 for controlling the rise or fall of the internal temperature of the hot and cold environment chamber 1. An opening is provided on the hot and cold environment chamber 1 for installing the windshield test piece 2.

[0033] like Figure 4 As shown, the enclosure of the hot and cold environment chamber 1 is a laminated glass structure, with an insulating film layer inside. A laminated glass structure refers to a structure in which the insulating film layer is sandwiched between two glass structures.

[0034] In the above embodiment, when testing the anti-fogging performance of the anti-fogging agent, the cooling and heating device 3 is first installed on the side of the hot and cold environment chamber 1, with at least two sets of cooling and heating devices 3 installed to provide a cold source and a heat source for the hot and cold environment chamber 1 respectively. After controlling the temperature and relative humidity of the air inside and outside the hot and cold environment chamber 1 to the conditions required for the experiment, the inside of the hot and cold environment chamber 1 is dehydrated. Then, a windshield test piece 2 is installed at the opening on the hot and cold environment chamber 1. After the temperature inside and outside the hot and cold environment chamber 1 is stable for 48 to 72 hours, the windshield test piece 2 is cleaned and coated with anti-fogging agent. The temperature and relative humidity of the air outside the hot and cold environment chamber 1 are kept constant. By continuously controlling the temperature inside the hot and cold environment chamber 1, the anti-fogging agent on the windshield surface is simulated to be under different temperature conditions to test the anti-fogging performance of the anti-fogging agent.

[0035] The insulation film layer reduces heat conduction between the inside and outside of the hot and cold environment chamber, thereby increasing the rate at which the internal temperature of the chamber rises or falls. Without composite materials in the insulation film layer, the settling of the insulation material will reduce the rate at which the internal temperature of the hot and cold environment chamber rises or falls.

[0036] As an optional implementation, the thermal conductivity of the insulation film is 0.02 to 0.3 W / m·K.

[0037] Specifically, the thermal conductivity of the insulation film layer can be any one of 0.02 W / m·K, 0.04 W / m·K, 0.06 W / m·K, 0.08 W / m·K, 0.1 W / m·K, 0.12 W / m·K, 0.14 W / m·K, 0.16 W / m·K, 0.18 W / m·K, 0.2 W / m·K, 0.22 W / m·K, 0.24 W / m·K, 0.26 W / m·K, 0.28 W / m·K, 0.29 W / m·K, and 0.3 W / m·K.

[0038] Preferably, the thermal conductivity of the insulation film layer is 0.02 to 0.15 W / m·K. The low thermal conductivity of the insulation film layer improves the thermal insulation performance of the hot and cold environment chamber 1, thereby preventing heat transfer between the outside and the inside of the hot and cold environment chamber 1. This avoids the internal temperature of the hot and cold environment chamber 1 becoming unstable and fluctuating due to heat transfer between the inside and outside of the chamber after it has been cooled or heated to the required temperature. This would affect the test results of the anti-fogging agent's fog resistance. Furthermore, the low thermal conductivity of the insulation film layer can also improve the internal cooling or heating efficiency of the hot and cold environment chamber 1.

[0039] As an optional implementation, the heat insulation film layer is made of functional materials, which include the following substances in parts by weight: 10-30 parts of heat insulation material, 0.5-3 parts of composite material, 0.01-0.5 parts of dispersant, 0.5-5 parts of plasticizer, and 70-85 parts of thermoplastic resin.

[0040] Specifically, the composite material can be one of 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, and 3 parts; more preferably, the composite material can be 2 to 3 parts; preferably, the thermal insulation material is 10 to 30 parts, and the thermal insulation material can be one of 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, and 30 parts; more preferably, the thermal insulation material is 15 to 25 parts; the dispersant can be at least one of toluene, xylene, cyclohexane, etc.; and the plasticizer can be triethylene glycol di-2-ethylbutyrate or triethylene glycol di-2-ethylhexyl... The thermoplastic resin may be at least one of the following: ester, dibutyl sebacate, ethylene glycol di-2-ethylbutyrate, 1,3-propanediol di-2-ethylbutyrate, 1,4-butanediol di-2-ethylbutyrate, diethylene glycol di-2-ethylbutyrate, dihexyl adipate, oil-modified sebacate, tributoxyethyl phosphate, triisopropyl phosphate, dihexyl adipate, and triethylene glycol di-heptyl ester; the thermoplastic resin may be at least one of the following: polyvinyl alcohol acetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyacetal resin, modified polyphenylene ether resin, and polyphenylene sulfide resin.

[0041] As an optional implementation, the thermal insulation material includes titanium dioxide and hollow SiO2 nanofibers, and the mass ratio of hollow SiO2 nanofibers to titanium dioxide is 1:(0.1 to 0.8).

[0042] Specifically, the mass ratio of hollow SiO2 nanofibers to titanium dioxide can be one of 1:0.1, 1:0.2, 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7, or 1:0.8. More preferably, the mass ratio of hollow SiO2 nanofibers to titanium dioxide is 1:0.4 to 0.8. Hollow SiO2 nanofibers have low gas thermal conductivity and solid thermal conductivity, but relatively high radiative thermal conductivity, which reduces the thermal insulation performance of the insulation film. Titanium dioxide has a high refractive index, resulting in high solid thermal conductivity. When the mass ratio of hollow SiO2 nanofibers to titanium dioxide is greater than 1:0.1, it will lead to high radiative thermal conductivity and poor thermal insulation. However, when the mass ratio of hollow SiO2 nanofibers to titanium dioxide is less than 1:0.8, it will lead to high solid thermal conductivity, which will affect the thermal insulation of the cold and hot environment box 1.

[0043] The titanium dioxide is at least one of rutile, anatase, and plate titanium dioxide.

[0044] The composite material was prepared by the following method:

[0045] A: Place the graphene oxide dispersion and the amino silica gel dispersion into the reaction vessel and mix them evenly;

[0046] B: The substance in step A is subjected to a hydrothermal reaction at a temperature of 100-250℃ for 5-10 hours, followed by dehydration and purification. This dehydration and purification process removes water from the silica gel.

[0047] C: The material from step B is fed into a calcination furnace at a calcination temperature of 940–1000℃ for 0.5–1.5 hours to obtain a composite material. Calcination in the furnace can remove the water absorption properties of the dehydrated silica gel. Furthermore, when the temperature of the environment in which the silica gel is located changes, the silica gel will expand or contract, causing the silica gel to carry other substances to move and preventing incompatible substances from settling and affecting the thermal insulation performance of the product.

[0048] Further, in step A, the concentration of the graphene oxide dispersion is 0.1–2 mg / mL, and the concentration of the amino silica gel dispersion is 10–40 mg / mL. Preferably, the concentration of the graphene oxide dispersion is 0.1–2 mg / mL. The concentration of the graphene oxide dispersion can be 0.1 mg / mL, 0.3 mg / mL, 0.5 mg / mL, 0.8 mg / mL, 1 mg / mL, 1.1 mg / mL, 1.5 mg / mL, 1.8 mg / mL, or 2 mg / mL. More preferably, the concentration of the graphene oxide dispersion is 0.5–1 mg / mL, and more preferably, the concentration of the amino silica gel dispersion is 10–40 mg / mL. The concentration of the amino silica gel dispersion can be any one of 10 mg / mL, 13 mg / mL, 16 mg / mL, 19 mg / mL, 21 mg / mL, 25 mg / mL, 28 mg / mL, 30 mg / mL, 32 mg / mL, 36 mg / mL, 38 mg / mL, and 40 mg / mL. More preferably, the concentration of the amino silica gel dispersion is 20–30 mg / mL. The concentration settings of the graphene oxide dispersion and the amino silica gel dispersion allow the graphene oxide in the graphene oxide dispersion to fully encapsulate the silica gel, preventing excess graphene oxide, and requiring multiple removals of the graphene oxide.

[0049] The composite material is a mixture of silicone and graphene-encapsulated silicone. The silicone treated with this invention is non-absorbent and expands or contracts with temperature changes, promoting the movement of molecules within the insulation material. This prevents incompatibility with other substances, which could lead to sedimentation and affect the insulation performance. Furthermore, when the silicone expands, the graphene encapsulating it detaches from the surface. During silicone contraction or expansion, the graphene moves, entering the pores of the hollow SiO2 nanofibers and reducing the pore size between them. The smaller the pores between fibers, the greater the restriction on the movement of gas molecules, resulting in lower gas thermal conductivity. Furthermore, because graphene is located inside the hollow SiO2 nanofibers, the presence of graphene increases the heat transfer path and creates more obstacles, thus reducing the thermal conductivity of the solid. Additionally, the increased obstacles cause multiple reflections and refractions of infrared radiation at the interface, further reducing radiative heat transfer. This improves the thermal insulation performance of the insulating film. Moreover, graphene's conductivity prevents static electricity buildup in the insulating film, thus avoiding potential hazards. The silica gel in the composite material consists of dehydrated and modified spherical silica gel particles with a diameter of 2–3 mm and a density controlled at 1–2 g / cm³. 3 .

[0050] As an optional implementation method, such as Figure 1 As shown, the cooling and heating device 3 includes at least two sets, and at least one set is used only for cooling and at least one set is used only for heating.

[0051] As an optional implementation method, such as Figure 2-3 As shown, the cooling and heating device 3 includes heat insulation cotton 402, a first radiator 303, a second radiator 305 and a cooling plate 306. The first radiator 303 and the second radiator 305 are respectively connected to both sides of the heat insulation cotton 402, and the heat insulation cotton 402 has a connection port for placing the cooling plate 306.

[0052] As an optional implementation method, such as Figure 2 As shown, the cooling and heating device 3 also includes a first fan 301 and a second fan 304. The second fan 304 is installed on the side of the first radiator 303 away from the insulation cotton 302, and the first fan 301 is installed on the side of the second radiator 305 away from the insulation cotton 302.

[0053] Regarding the thermal conductivity of the insulation film and the insulation performance of the hot and cold environment chamber 1, the present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0054] Example 1

[0055] Preparation of the heat insulation film: By mass, 10 parts of heat insulation material, 0.5 parts of composite material, 0.01 parts of cyclohexane, 0.5 parts of dibutyl sebacate, and 70 parts of polyacetal resin were placed into an extruder for co-extrusion (temperature controlled at 80℃); the extrudate was remelted and molded (temperature controlled at 140℃ and pressure controlled at 15MPa) to obtain a heat insulation film with a thickness of 1mm.

[0056] The thermal insulation material includes titanium dioxide and hollow SiO2 nanofibers, with a mass ratio of hollow SiO2 nanofibers to titanium dioxide of 1:0.1. The titanium dioxide is rutile type, and the hollow SiO2 nanofibers have a diameter of 30 nm.

[0057] The composite material is prepared by the following method:

[0058] A: Place the graphene oxide dispersion and the amino silica gel dispersion into the reaction vessel and mix them evenly;

[0059] B: The substance in step A is subjected to a hydrothermal reaction at a temperature of 100℃ for 5 hours, and then dehydrated and purified.

[0060] C: The material from step B is fed into a calcining furnace, calcined at 940℃ for 0.5 hours to obtain the composite material.

[0061] In step A, the concentration of the graphene oxide dispersion is 0.1 mg / mL, and the concentration of the amino silica gel dispersion is 10 mg / mL.

[0062] Example 2

[0063] Preparation of the heat insulation film: By mass, 30 parts of heat insulation material, 3 parts of composite material, 0.5 parts of xylene, 5 parts of dihexyl adipate, and 85 parts of polyphenylene sulfide resin were placed into an extruder for co-extrusion (temperature controlled at 85℃); the extrudate was remelted and molded (temperature controlled at 145℃ and pressure controlled at 15MPa) to obtain a heat insulation film with a thickness of 1mm.

[0064] The thermal insulation material includes titanium dioxide and hollow SiO2 nanofibers, with a mass ratio of hollow SiO2 nanofibers to titanium dioxide of 1:0.8. The titanium dioxide is anatase and the hollow SiO2 nanofibers have a diameter of 80 nm.

[0065] The composite material is prepared by the following method:

[0066] A: Place the graphene oxide dispersion and the amino silica gel dispersion into the reaction vessel and mix them evenly;

[0067] B: The substance in step A is subjected to a hydrothermal reaction at a temperature of 200℃ for 10 hours, and then dehydrated and purified.

[0068] C: The material from step B is fed into a calcining furnace, calcined at 1000℃ for 1.5 hours to obtain the composite material.

[0069] In step A, the concentration of the graphene oxide dispersion is 2 mg / mL, and the concentration of the amino silica gel dispersion is 40 mg / mL.

[0070] Example 3

[0071] Preparation of the heat insulation film: By mass, 20 parts of heat insulation material, 1.5 parts of composite material, 0.2 parts of toluene, 2 parts of ethylene glycol di-2-ethylbutyrate, and 80 parts of polyphenylene sulfide resin were placed into an extruder for co-extrusion (temperature controlled at 80℃). The extrudate was remelted and then molded (temperature controlled at 140℃ and pressure controlled at 18MPa) to obtain a heat insulation film with a thickness of 1mm.

[0072] The thermal insulation material includes titanium dioxide and hollow SiO2 nanofibers, with a mass ratio of hollow SiO2 nanofibers to titanium dioxide of 1:0.5. The titanium dioxide is rutile and the hollow SiO2 nanofibers have a diameter of 50 nm.

[0073] The composite material is prepared by the following method:

[0074] A: Place the graphene oxide dispersion and the amino silica gel dispersion into the reaction vessel and mix them evenly;

[0075] B: The substance in step A is subjected to a hydrothermal reaction at a temperature of 150°C for 6 hours, and then dehydrated and purified.

[0076] C: The material from step B is fed into a calcining furnace, calcined at 950°C for 1 hour, to obtain the composite material.

[0077] In step A, the concentration of the graphene oxide dispersion is 1 mg / mL, and the concentration of the amino silica gel dispersion is 20 mg / mL.

[0078] Example 4

[0079] The enclosure of the hot and cold environment chamber is a laminated glass structure;

[0080] Preparation of laminated glass structure: The heat insulation film layer is sandwiched between two glass structures. The two glass structures with the heat insulation film layer sandwiched between them are placed in a sealed environment. After the sealed environment is evacuated, it is heated and subjected to high pressure treatment. The heating temperature is 80℃ and the heating time is 20min. The high pressure temperature is 120℃ and the pressure is 1MPa for 20min, which yields the laminated glass structure.

[0081] The preparation of the heat insulation film layer is the same as in Example 1.

[0082] Example 5

[0083] The enclosure of the hot and cold environment chamber is a laminated glass structure;

[0084] Preparation of laminated glass structure: The heat insulation film layer is sandwiched between two glass structures. The two glass structures with the heat insulation film layer sandwiched between them are placed in a sealed environment. After the sealed environment is evacuated, the sealed environment is subjected to high-pressure heating treatment. The heating temperature is 100℃ and the heating time is 30min. The high-pressure temperature is 150℃ and the pressure is 3MPa for 30min, which yields the laminated glass structure.

[0085] The preparation of the heat insulation film layer is the same as in Example 2.

[0086] Example 6

[0087] The enclosure of the hot and cold environment chamber is a laminated glass structure;

[0088] Preparation of laminated glass structure: The heat insulation film layer is sandwiched between two glass structures. The two glass structures with the heat insulation film layer sandwiched between them are placed in a sealed environment. After the sealed environment is evacuated, it is subjected to high-pressure heating treatment. The heating temperature is 90℃ and the heating time is 25min. The high-pressure temperature is 120℃ and the pressure is 1.53MPa for 30min, thus obtaining the laminated glass structure.

[0089] The preparation of the heat insulation film layer is the same as in Example 3.

[0090] Comparative Example 1

[0091] The composition of the heat insulation film layer used is basically the same as that in Example 1, and the preparation process is the same as that in Example 1. The difference is that the functional material does not contain composite materials.

[0092] Comparative Example 2

[0093] The hot and cold environment chamber is made of ordinary laminated glass.

[0094] Comparative Example 3

[0095] The hot and cold environment chamber is the same as in Example 1, and the preparation of the heat insulation film layer is the same as in Comparative Example 1.

[0096] Thermal conductivity experiments were conducted on Examples 1-3 and Comparative Example 1. The thermal insulation film layer in the experiment was a thermal insulation film layer that had been placed for one month.

[0097] Contact heat transfer experiments were conducted on Examples 4-6 and Comparative Examples 2-3. The insulation film layer sandwiched in the hot and cold environment chambers of Examples 4-6 and Comparative Example 3 was also an insulation film layer that had been placed for one month. The dimensions of the hot and cold environment chambers in Examples 4-6 and Comparative Examples 2-3 were 5cm*5cm*5cm, and the cooling and heating device installed on the side of the hot and cold environment chamber had a cooling power of 80W. The specific experimental methods are as follows:

[0098] Contact heat transfer test: The test was conducted according to ISO 12127-1:2007. In Examples 4-6 and Comparative Examples 2-3, the internal temperature of the hot and cold environment chamber was 30°C, and the chamber was dehydrated. The external temperature of the hot and cold environment chamber was 30°C, and the relative humidity was 50%. The time it took for the temperature at the same point inside the hot and cold environment chamber to drop to 23°C was measured.

[0099] Thermal conductivity test: Thermal conductivity test shall be conducted in accordance with GB / T 5990-2006 standard.

[0100] The experimental data obtained from Examples 1-6 and Comparative Examples 1-3 are shown in Table 1 below:

[0101] Table 1

[0102] Serial Number Contact heat transfer time (seconds) Thermal conductivity (W / m·K) Example 1 / 0.14 Example 2 / 0.09 Example 3 / 0.03 Example 4 21 / Example 5 38 / Example 6 11 / Comparative Example 1 / 0.45 Comparative Example 2 73 / Comparative Example 3 46 /

[0103] As can be seen from the comparison between Examples 1-3 and Comparative Example 1, after one month of placement, due to the addition of composite materials, the composite materials and other components in the heat insulation film still have good stability, resulting in a low thermal conductivity of the heat insulation film.

[0104] Comparative analysis of Examples 4-6 and Comparative Examples 2-3 shows that, under the condition that the cooling power of the refrigeration and heating device is 80W, the setting of the heat insulation film layer can reduce the heat conduction between the inside and outside of the cold and hot environment box, thereby increasing the rate of temperature rise or fall inside the cold and hot environment box. Under the condition that no composite material is set in the heat insulation film layer, the settling of the heat insulation material will reduce the rate of temperature rise or fall inside the cold and hot environment box.

[0105] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. The present invention is not limited to the specific steps and structures described above and shown in the figures. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0106] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art without departing from the scope of the invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the scope of the claims of this application.

Claims

1. A testing device for the anti-fogging properties of an anti-fogging agent, characterized in that, The device includes a hot and cold environment chamber (1), a windshield test piece (2), and a cooling and heating device (3) for controlling the rise or fall of the internal temperature of the hot and cold environment chamber (1). The hot and cold environment chamber (1) has an opening for installing the windshield test piece (2). The chamber body of the hot and cold environment chamber (1) is a laminated glass structure, and the interior of the laminated glass structure is provided with a heat insulation film layer. The heat insulation film layer is made of functional materials, which include the following substances in parts by weight: 10-30 parts of heat insulation material, 0.5-3 parts of composite material, 0.01-0.5 parts of dispersant, 0.5-5 parts of plasticizer, and 70-85 parts of thermoplastic resin; the heat insulation material includes titanium dioxide and hollow SiO2 nanofibers, and the mass ratio of hollow SiO2 nanofibers to titanium dioxide is 1:(0.1-0.8); The composite material is a mixture of silicone and graphene-encapsulated silicone, and its preparation method includes: A: Place the graphene oxide dispersion and the amino silica gel dispersion into the reaction vessel and mix them evenly; B: The substance in step A is subjected to a hydrothermal reaction at a temperature of 100-250℃ for 5-10 hours, followed by dehydration and purification. This dehydration and purification process removes water from the silica gel. C: The material from step B is fed into a calcining furnace, calcined at a temperature of 940–1000℃ for 0.5–1.5 h, to obtain the composite material.

2. The testing device for the anti-fogging resistance of the anti-fogging agent according to claim 1, characterized in that, The thermal conductivity of the heat insulation film is 0.02 to 0.3 W / m·K.

3. The testing device for the anti-fogging resistance of the anti-fogging agent according to claim 1, characterized in that, The mass ratio of the hollow SiO2 nanofibers to the titanium dioxide is 1:(0.4-0.8).

4. The testing device for the anti-fogging resistance of the anti-fogging agent according to claim 1, characterized in that, The titanium dioxide is at least one of rutile, anatase, and plate titanium dioxide.

5. The testing device for the anti-fogging resistance of the anti-fogging agent according to claim 1, characterized in that, The cooling and heating device (3) includes at least two sets, and at least one set is used only for cooling and at least one set is used only for heating.

6. The testing apparatus for the anti-fogging resistance of an anti-fogging agent according to any one of claims 1-5, characterized in that, The cooling and heating device (3) includes heat insulation cotton (302), a first radiator (303), a second radiator (305) and a cooling plate (306). The first radiator (303) and the second radiator (305) are respectively connected to both sides of the heat insulation cotton (302). The heat insulation cotton (302) has a connection port for placing the cooling plate (306).

7. The testing apparatus for the anti-fogging resistance of the anti-fogging agent according to claim 6, characterized in that, The cooling and heating device (3) further includes a first fan (301) and a second fan (304). The second fan (304) is installed on the side of the first radiator (303) away from the heat insulation cotton (302), and the first fan (301) is installed on the side of the second radiator (305) away from the heat insulation cotton (302).

Images