Self-heating heat preservation window film with photothermal conversion performance and preparation method of self-heating heat preservation window film

Abstract

The invention belongs to the technical field of heat preservation window films, and relates to a self-heating heat preservation window film with photothermal conversion performance and a preparation method thereof.The self-heating heat preservation window film with photothermal conversion performance sequentially comprises a self-heating polyurethane coating, a first heat preservation layer, a core layer, a second heat preservation layer and a bonding layer; the self-heating polyurethane coating is prepared from a Prussian blue composite polyurethane coating solution; the addition amount of the Prussian blue nano particles in the Prussian blue composite polyurethane coating liquid is 0.1 to 10 weight percent; the average particle size of the Prussian blue nano particles is 10 to 50 nm. The self-heating heat preservation window film with the photo-thermal conversion performance absorbs near-infrared light to increase the temperature and preserve heat under the irradiation of sunlight, heat transferred outwards can be reduced at night, and energy consumed for heating in high-latitude areas is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of thermal insulation window films, and relates to a self-heating thermal insulation window film with light-heat conversion performance and a preparation method thereof. Background Art

[0002] In winter, the solar altitude angle is small, the daytime is short, and the amount of solar radiation received is small, resulting in lower temperatures. Especially in high-latitude areas, due to their special geographical location, they often face extreme climatic conditions. In summer, although the solar altitude angle is large and the daytime is long, due to the climatic characteristics of high-latitude areas, the temperature is also significantly lower than that of low-latitude areas.

[0003] Windows are an indispensable and important part of residential buildings, but they are also the weakest part of the building in terms of thermal insulation performance. Windows are made of materials such as glass, which have a high thermal conductivity coefficient and are easy to dissipate heat, making their thermal insulation performance relatively weak. Therefore, residents usually use window films to assist in thermal insulation. Currently, most window films on the market are mainly for heat insulation, and window films for the thermal insulation needs of high-latitude areas are rare, and most window films can only achieve the function of thermal insulation and cannot meet the needs. Summary of the invention

[0004] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose a self-heating thermal insulation window film with light-to-heat conversion performance, which can quickly heat up and effectively keep warm under sunlight.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A self-heating thermal insulation window film with light-to-heat conversion performance comprises: a self-heating polyurethane coating, a first thermal insulation layer, a core layer, a second thermal insulation layer, and an adhesive layer in sequence; the self-heating polyurethane coating is made of a Prussian blue composite polyurethane coating liquid; the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.1-10wt%; and the average particle size of the Prussian blue nanoparticles is 10-50nm.

[0006] Preferably, the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.1-5wt%.

[0007] More preferably, the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating solution is 0.1-0.9 wt %.

[0008] Preferably, the thickness ratio of the self-heating polyurethane coating, the first thermal insulation layer, the core layer and the second thermal insulation layer is (1-10): (20-50): (200-500): (20-50).

[0009] Preferably, a release layer is further provided on the other side of the adhesive layer.

[0010] Preferably, the raw materials of the Prussian blue composite polyurethane coating liquid include: 100-1000 parts of water-based polyester, 500-3000 parts of water-based polyurethane, 10-200 parts of melamine resin, 10-100 parts of Prussian blue nanoparticles, 10-100 parts of silicon dioxide nanoparticles, 1-20 parts of wetting agent, and the balance is water.

[0011] Preferably, the preparation method of the Prussian blue composite polyurethane coating liquid comprises: sequentially adding a wetting agent diluent, an aqueous polyester diluent, an aqueous polyurethane, a melamine resin diluent, a Prussian blue nanoparticle dispersion, and an aqueous silica dispersion into an alkaline aqueous solution and stirring the mixture to obtain an aqueous Prussian blue composite polyurethane coating liquid.

[0012] Preferably, the solid content of the Prussian blue composite polyurethane coating liquid is 5-20%.

[0013] Preferably, the preparation method of the Prussian blue composite polyurethane coating liquid comprises: (1) Take 50-80% of water and adjust the pH value to 8.0-9.0; take a wetting agent and add an organic solvent to dilute it to obtain a wetting agent dilution solution, slowly add the wetting agent dilution solution to the above aqueous solution and mix and stir evenly to obtain solution A; (2) Add water to dilute the aqueous polyester to obtain an aqueous polyester dilution solution, add the aqueous polyester dilution solution to solution A, stir evenly, then slowly add the aqueous polyurethane, and continue stirring to obtain solution B; (3) taking melamine resin and adding water to dilute it to obtain a melamine resin dilution solution, adding the melamine resin dilution solution to solution B, and continuously stirring to obtain solution C; (4) adding Prussian blue nanoparticles to an organic solvent and ultrasonically dispersing the particles to obtain a Prussian blue nanoparticle dispersion, and slowly adding the Prussian blue nanoparticle dispersion to solution C while continuously stirring to obtain solution D; (5) Add water to the silica nanoparticles to dilute them to obtain an aqueous silica dispersion, stir the solution D, and slowly add the silica dispersion into the solution D under stirring. After stirring evenly, add the remaining 20-50% of water, adjust the pH value to 8.0-9.0, continue stirring, and obtain a Prussian blue composite polyurethane coating solution.

[0014] More preferably, (1) the mass ratio of the wetting agent to the organic solvent in the wetting agent dilution solution is 1:(1-10).

[0015] More preferably, the mass ratio of the aqueous polyester, aqueous polyurethane and water in (2) solution B is 1:(1.5-10):(1-5).

[0016] More preferably, the mass ratio of melamine resin to water in (3) the melamine resin dilution solution is 1:(1-10).

[0017] More preferably, (4) the mass ratio of the Prussian blue nanoparticles to the organic solvent in the Prussian blue nanoparticle dispersion is 1:(1-10).

[0018] More preferably, (5) the mass ratio of the silica nanoparticles to water in the silica aqueous dispersion is 1:(1-10).

[0019] More preferably, the mass ratio of the wetting agent, the aqueous polyester, the aqueous polyurethane, the melamine resin, the Prussian blue nanoparticles, and the silica nanoparticles is (1-10): (200-600): (800-2000): (60-90): (20-70): (10-50).

[0020] Preferably, the first thermal insulation layer and the second thermal insulation layer are respectively a silicon dioxide coating layer and a super hydrophobic TPU / SiO 2 One or both of the sponge layers.

[0021] Preferably, the first thermal insulation layer and the second thermal insulation layer are both super hydrophobic TPU / SiO 2 Sponge layer.

[0022] Further preferably, the super hydrophobic TPU / SiO 2 The sponge layer is composed of PDMS / SiO 2 / ECA dispersion sprayed on porous TPU / SiO 2 The surface of the sponge is obtained after drying.

[0023] Further preferably, the super hydrophobic TPU / SiO 2 The preparation method of the sponge layer comprises: (1) Dissolve TPU in an organic solvent, add silicon dioxide, and heat and stir; then add glucose and stir to obtain TPU / SiO 2 / glucose dispersion, deposited at room temperature and then heated and cured to obtain a semi-cured film; (2) The semi-cured film was placed in deionized water to remove glucose and obtain porous TPU / SiO 2 sponge; (3) Dissolve PDMS in an organic solvent, then add silica and ethyl cyanoacrylate (ECA) to form PDMS / SiO 2 / ECA dispersion; (4) PDMS / SiO 2 / ECA dispersion sprayed on porous TPU / SiO 2 The surface of the sponge was naturally air-dried to obtain super-hydrophobic TPU / SiO2 (S-TPU / SiO 2 )sponge.

[0024] Preferably, the core layer is a BOPET high-transparency layer.

[0025] A method for preparing a self-heating thermal insulation window film with light-to-heat conversion performance comprises: After coating light-curing glue on both sides of the core layer, the first insulation layer and the second insulation layer are attached, cured by ultraviolet light, and then Prussian blue composite polyurethane coating liquid is coated on the surface of the first insulation layer and dried. Then, the adhesive layer is covered on the surface of the second insulation layer to obtain a self-heating insulation window film with light-to-heat conversion performance.

[0026] More preferably, the UV curing wavelength is 220-260 nm and the curing time is 1-20 s.

[0027] More preferably, the coating amount of the Prussian blue composite polyurethane coating liquid is 1 to 30 g / m 2 .

[0028] More preferably, the coating amount of the Prussian blue composite polyurethane coating liquid is 4 to 10 g / m 2 .

[0029] More preferably, the Prussian blue composite polyurethane coating liquid is dried at a temperature of 200-290° C. for a time of 1-60 seconds.

[0030] Compared with the prior art, the present invention has the following beneficial effects: 1. The self-heating thermal insulation window film with light-to-heat conversion performance of the present invention absorbs near-infrared light to increase the temperature and keep warm under sunlight, which can reduce the heat transferred to the outside at night and greatly reduce the energy consumed for heating in high-latitude areas; 2. The self-heating polyurethane coating in the self-heating thermal insulation window film with light-to-heat conversion capability of the present invention includes Prussian blue nanoparticles, which have strong near-infrared absorption capability and can raise a certain temperature in a short time under the irradiation of light source. Moreover, the color of the Prussian blue nanoparticles is dark blue, and they can effectively absorb ultraviolet rays on the film surface, thereby improving the ultraviolet blocking rate. 3. The self-heating thermal insulation window film with light-to-heat conversion capability of the present invention is easy to implement, cost-effective, and has excellent energy-saving effect, effectively filling the gap in the current market for window films that do not meet the special needs of high-latitude areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The temperature change diagram of the self-heating thermal insulation window films with light-to-heat conversion capability of Examples 1 to 10 of the present invention and the thermal insulation window films of Comparative Examples 1 to 2 under sunlight.

[0032] Figure 2The thermal insulation temperature variation diagram of the self-heating thermal insulation window films with light-to-heat conversion capability according to Examples 1 to 10 of the present invention and the thermal insulation window films of Comparative Examples 1 to 2 is shown. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further described below through specific embodiments and drawings. It should be understood that the specific embodiments described herein are only used to help understand the present invention and are not specifically limited to the present invention. The drawings used herein are only for better illustrating the disclosed content of the present invention and do not have a limiting effect on the scope of protection.

[0034] Unless otherwise specified, the materials used in the present invention are conventional commercial products, and the methods used are conventional technical means.

[0035] In this article, the raw materials include: Prussian blue nanoparticles: Xi'an Qiyue Biotechnology, with average particle sizes of 10, 25, and 50 nm.

[0036] BOPET high transparency layer: Ningbo Changyang Technology, OSG model product.

[0037] Adhesive layer: Tianjin Binlian Technology, BL308 water-based environmentally friendly PVC window adhesive.

[0038] In this article, every 100 parts of the Prussian blue composite polyurethane coating liquid contains 0.1 to 10 parts of Prussian blue nanoparticles.

[0039] In this article, the core layer and the adhesive layer may be replaced by other commercially available products, which can also achieve the temperature increase and heat preservation effects described in the present invention.

[0040] In this article, the first thermal insulation layer and the second thermal insulation layer can be replaced by other commercially available products having similar performance to the first thermal insulation layer and the second thermal insulation layer of the present application.

[0041] In this paper, the test conditions are as follows: at room temperature (25°C), a self-heating thermal insulation window film with light-heat conversion energy is attached to the surface of glass (a small enclosed glass room), continuously exposed to sunlight, and recorded with an infrared thermometer for 60 minutes; the temperature change is shown in Figure 1 Block the sunlight and use an infrared thermometer to record the temperature change for 60 minutes. Figure 2 . Example 1

[0042] The self-heating thermal insulation window film with light-to-heat conversion performance in this embodiment includes: a self-heating polyurethane coating, a first thermal insulation layer, a core layer, a second thermal insulation layer, and an adhesive layer; the total thickness is 33.8 μm, and the thickness ratio is 5:40:250:40:3. The first thermal insulation layer and the second thermal insulation layer are both super hydrophobic TPU / SiO 2 Sponge layer; the core layer is BOPET high transparency layer.

[0043] Self-heating polyurethane coating: (1) Take 60% water and adjust the pH value to 8.5; take 5 parts of wetting agent and dilute it with 10 parts of ethanol, then slowly add the diluted wetting agent solution into the above aqueous solution and mix and stir evenly to obtain solution A; (2) 400 parts of water-based polyester were added to 800 g of deionized water to obtain a water-based polyester diluent, the water-based polyester diluent was added to solution A, stirred evenly, and then 1200 parts of water-based polyurethane were slowly added, and stirred continuously to obtain solution B; (3) 80 parts of melamine resin were added to 160 parts of deionized water to obtain a melamine resin dilution solution, and the melamine resin dilution solution was added to solution B, and the mixture was continuously stirred to obtain solution C; (4) 50 parts of Prussian blue nanoparticles with an average particle size of 10 nm (the amount added is 0.5 wt%) are added to 200 parts of deionized water and ultrasonically dispersed to obtain a Prussian blue nanoparticle dispersion, and the Prussian blue nanoparticle dispersion is slowly added to solution C with continuous stirring to obtain solution D; (5) Take 30 parts of silica nanoparticles (average particle size of 100 nm) and add 60 parts of deionized water to dilute to obtain an aqueous silica dispersion. Stir solution D. Under stirring conditions, slowly add the aqueous silica dispersion to solution D. After stirring evenly, add the remaining 40% of water, adjust the pH value to 8.5, and continue stirring for 2 hours to obtain an aqueous Prussian blue composite polyurethane coating solution.

[0044] Super hydrophobic TPU / SiO 2 Sponge layer (S-TPU / SiO 2 ): 1) Dissolve 15.2 parts of TPU in 200 parts of DMF and add 2 parts of SiO 2 The mixture was heated and stirred at 80 °C for 1 h to obtain a TPU / SiO 2 Then, 100 parts of glucose (average particle size 300 μm) was added and stirred evenly to obtain TPU / SiO 2 / Glucose dispersion, TPU / SiO 2 / Glucose dispersion was poured into a culture dish, and after natural sedimentation at room temperature for 1 hour, it was heated and cured at 60°C for 3 hours to obtain a semi-cured film; (2) The semi-cured film was immersed in 40°C deionized water to remove glucose and obtain porous TPU / SiO 2 sponge; (3) Dissolve 20 parts of PDMS in 500 parts of ethyl acetate, then add 10 parts of SiO 2 Mix with 10 parts of ECA to form PDMS / SiO2 / ECA dispersion; (4) PDMS / SiO 2 / ECA dispersion sprayed on porous TPU / SiO 2 The surface of the sponge is sprayed at a rate of 10 g / m 2 , naturally air-dried to obtain super-hydrophobic TPU / SiO 2 (S-TPU / SiO 2 )sponge.

[0045] The preparation method of the self-heating thermal insulation window film with light-to-heat conversion performance comprises: taking the finished OSG product, coating both sides with acrylic light-curing glue by slit coating, and then 2 (S-TPU / SiO 2 ) sponge is attached, and cured after 5s under 235nm ultraviolet irradiation to obtain a membrane with a first and second insulation layer. Then, the prepared water-based Prussian blue composite polyurethane coating liquid is coated on the surface of the first insulation layer through D-Bar, wherein the wet coating amount is 8g / m 2 , and then baked in an oven at 250°C for 10 seconds to solidify the coating, and finally the adhesive layer is coated on the surface of the second insulation layer through slit coating to obtain a self-heating insulation window film with light-to-heat conversion performance.

[0046] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 2

[0047] Compared with Example 1, the difference is that the self-heating thermal insulation window film with light-to-heat conversion performance in this embodiment includes: a self-heating polyurethane coating, a first thermal insulation layer, a core layer, a second thermal insulation layer, and an adhesive layer; the first thermal insulation layer and the second thermal insulation layer are both super-hydrophobic TPU / SiO 2 Sponge layer; total thickness is 34.3μm, and thickness ratio is 10:40:250:40:3.

[0048] Self-heating polyurethane coating: (1) Take 80% of water and adjust the pH value to 8.5; take 8 parts of wetting agent and dilute it with 20 parts of ethanol, then slowly add the diluted wetting agent solution into the above aqueous solution and mix and stir evenly to obtain solution A; (2) 200 parts of water-based polyester were added to 800 parts of deionized water to obtain a water-based polyester diluent, the water-based polyester diluent was added to solution A, stirred evenly, and then 1000 parts of water-based polyurethane were slowly added, and stirred continuously to obtain solution B; (3) 80 parts of melamine resin were added to 160 parts of deionized water to obtain a melamine resin dilution solution, and the melamine resin dilution solution was added to solution B, and the mixture was continuously stirred to obtain solution C; (4) 50 parts of Prussian blue nanoparticles with an average particle size of 10 nm (the amount added is 0.5 wt%) are added to 300 parts of deionized water and ultrasonically dispersed to obtain a Prussian blue nanoparticle dispersion, and the Prussian blue nanoparticle dispersion is slowly added to solution C with continuous stirring to obtain solution D; (5) Take 20 parts of silica nanoparticles (average particle size of 100 nm) and add 60 parts of deionized water to dilute to obtain an aqueous silica dispersion. Stir solution D. Under stirring conditions, slowly add the aqueous silica dispersion to solution D. After stirring evenly, add the remaining 20% ​​of water, adjust the pH to 8.5, and continue stirring for 5 hours to obtain an aqueous Prussian blue composite polyurethane coating solution.

[0049] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 3

[0050] Compared with Example 1, the difference is that the self-heating thermal insulation window film with light-to-heat conversion performance in this embodiment includes: a self-heating polyurethane coating, a first thermal insulation layer, a core layer, a second thermal insulation layer, and an adhesive layer; the first thermal insulation layer and the second thermal insulation layer are both super-hydrophobic TPU / SiO 2 Sponge layer; total thickness is 34.8μm, and thickness ratio is 15:40:250:40:3.

[0051] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 4

[0052] Compared with Example 1, the difference is that the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.1wt%.

[0053] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 5

[0054] Compared with Example 1, the difference is that the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.7wt%.

[0055] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 6

[0056] Compared with Example 1, the difference is that the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.9wt%.

[0057] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 7

[0058] Compared with Example 1, the difference is that the average particle size of the Prussian blue nanoparticles in the Prussian blue composite polyurethane coating liquid is 25 nm.

[0059] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 8

[0060] Compared with Example 1, the difference is that the average particle size of the Prussian blue nanoparticles in the Prussian blue composite polyurethane coating liquid is 50 nm.

[0061] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Example 9

[0062] Compared with Example 1, the difference is that the first thermal insulation layer and the second thermal insulation layer are silicon dioxide coating layers.

[0063] The preparation method of the silicon dioxide coating comprises: taking an OSG finished product, coating silicon dioxide on both sides of the OSG by a PEVCD method, and obtaining a membrane with a first and a second insulation layer, and then coating the prepared water-based Prussian blue composite polyurethane coating liquid on the surface of the first insulation layer by a D-Bar, wherein the wet coating amount is 8g / m 2 , and then baked in a 250°C oven for 10 seconds to solidify the coating, and finally the adhesive layer is coated on the second thermal insulation layer through slit coating to obtain a self-heating thermal insulation window film with light-to-heat conversion performance.

[0064] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1; See the change of insulation temperature Figure 2 . Example 10

[0065] Compared with Example 1, the difference is that the self-heating thermal insulation window film with light-to-heat conversion performance in this embodiment includes: a self-heating polyurethane coating, a core layer, an insulation layer, and an adhesive layer; the Prussian blue composite polyurethane coating liquid is directly coated on the surface of one side of the core layer.

[0066] The self-heating thermal insulation window film with light-heat conversion performance is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in Figure 2. Figure 1 ; See the change of insulation temperature Figure 2 . Comparative Example 1

[0067] Compared with Example 1, the difference is that the thermal insulation window film in this comparative example does not have a self-heating polyurethane coating.

[0068] The thermal insulation window film in this comparative example includes: a first thermal insulation layer, a core layer, a second thermal insulation layer, and an adhesive layer; the first thermal insulation layer and the second thermal insulation layer are both super hydrophobic TPU / SiO 2 Sponge layer; total thickness is 33.3μm, thickness ratio is 40:250:40:3.

[0069] The thermal insulation window film in this comparative example is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in FIG. Figure 1 ; See the change of insulation temperature Figure 2 . Comparative Example 2

[0070] Compared with Example 1, the difference is that the self-heating polyurethane coating of the thermal insulation window film in this comparative example does not contain Prussian blue nanoparticles.

[0071] The thermal insulation window film in this comparative example is attached to the glass surface, and the temperature change after irradiation with sunlight is shown in FIG. Figure 1 ; See the change of insulation temperature Figure 2 .

[0072] according to Figure 1 , Figure 2 It can be seen that in the present invention, by changing the amount and particle size of Prussian blue nanoparticles added in the self-heating polyurethane coating, the number of layers and components of the thermal insulation layer are adjusted to achieve better heating and thermal insulation effects; without adding Prussian blue nanoparticles or abandoning the self-heating polyurethane coating, the heating and thermal insulation performances are significantly reduced.

[0073] In summary, the self-heating thermal insulation window film with light-to-heat conversion performance of the present invention absorbs near-infrared light to increase the temperature and keep warm under sunlight, which can reduce the heat transferred to the outside at night and greatly reduce the energy consumed for heating in high-latitude areas.

[0074] The various aspects, embodiments, and features of the present invention should be considered to be illustrative in all aspects and not limiting of the present invention, the scope of which is defined solely by the claims. Other embodiments, modifications, and uses will be apparent to those skilled in the art without departing from the spirit and scope of the claimed invention.

[0075] In the preparation method of the present invention, the order of each step is not limited to the order listed. For those skilled in the art, without creative work, the order of each step is also within the protection scope of the present invention. In addition, two or more steps or actions can be performed simultaneously.

[0076] Finally, it should be noted that the specific embodiments described herein are merely examples of the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art of the present invention may make various modifications or supplements to the specific embodiments described, or replace them in a similar manner. It is not necessary and impossible to provide all examples of all implementation methods here. However, these obvious changes or modifications derived from the essential spirit of the present invention still fall within the scope of protection of the present invention, and interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A self-heating thermal insulation window film with light-to-heat conversion performance, characterized in that: The invention comprises in sequence: a self-heating polyurethane coating, a first heat-insulating layer, a core layer, a second heat-insulating layer and an adhesive layer; the self-heating polyurethane coating is prepared from a Prussian blue composite polyurethane coating liquid; the amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating liquid is 0.1-10wt%; and the average particle size of the Prussian blue nanoparticles is 10-50nm.

2. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The amount of Prussian blue nanoparticles added to the Prussian blue composite polyurethane coating solution is 0.1-5wt%.

3. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The thickness ratio of the self-heating polyurethane coating, the first thermal insulation layer, the core layer, and the second thermal insulation layer is (1-10): (20-50): (200-500): (20-50).

4. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The raw materials of the Prussian blue composite polyurethane coating liquid include: 100-1000 parts of water-based polyester, 500-3000 parts of water-based polyurethane, 10-200 parts of melamine resin, 10-100 parts of Prussian blue nanoparticles, 10-100 parts of silicon dioxide nanoparticles, 1-20 parts of wetting agent, and the balance is water.

5. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 4, characterized in that: The mass ratio of the wetting agent, water-based polyester, water-based polyurethane, melamine resin, Prussian blue nanoparticles and silicon dioxide nanoparticles is (1-10): (200-600): (800-2000): (60-90): (20-70): (10-50).

6. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The preparation method of the Prussian blue composite polyurethane coating liquid comprises: sequentially adding a wetting agent diluent, an aqueous polyester diluent, an aqueous polyurethane, a melamine resin diluent, a Prussian blue nanoparticle dispersion liquid, and an aqueous silicon dioxide dispersion liquid into an alkaline aqueous solution, and then stirring the mixture to obtain an aqueous Prussian blue composite polyurethane coating liquid.

7. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The first thermal insulation layer and the second thermal insulation layer are respectively one or two of a silicon dioxide coating layer and a super-hydrophobic TPU / SiO2 sponge layer.

8. The self-heating thermal insulation window film with light-to-heat conversion performance according to claim 1, characterized in that: The core layer is a BOPET high-transparency layer.

9. A method for preparing a self-heating thermal insulation window film with light-to-heat conversion performance as claimed in claim 1, characterized in that: The preparation method comprises: After coating light-curing glue on both sides of the core layer, the first insulation layer and the second insulation layer are attached, cured by ultraviolet light, and then Prussian blue composite polyurethane coating liquid is coated on the surface of the first insulation layer and dried. Then, the adhesive layer is covered on the surface of the second insulation layer to obtain a self-heating insulation window film with light-to-heat conversion performance.

10. The method for preparing the self-heating thermal insulation window film with light-to-heat conversion performance according to claim 9, characterized in that: The coating amount of the Prussian blue composite polyurethane coating liquid is 1-30 g / m 2 .

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