Infrared blocking dustproof plate for vehicle-mounted HUD and preparation method of infrared blocking dustproof plate

Abstract

The invention discloses an infrared blocking dustproof plate for a vehicle-mounted HUD (Head Up Display) and a preparation method of the infrared blocking dustproof plate. The dustproof plate sequentially comprises a first protective film, a first supporting film, a first polarizer protective film, a polarizer film, a second polarizer protective film, a second supporting film and a second protective film from outside to inside, wherein the first polaroid protection film and the second polaroid protection film are adhered to the polaroid film through an adhesive, and the first supporting film and the second supporting film are adhered to the first polaroid protection film and the second polaroid protection film through adhesive respectively; the adhesive is prepared from the following raw materials in parts by weight: 20-60 parts of acrylic resin, 0.1-1 part of a chelating agent, 0.05-5 parts of a curing agent, 0.01-5 parts of a silane coupling agent, 0.06-0.2 part of an infrared blocking agent and 20-70 parts of an organic solvent. The infrared blocking agent is a diamine derivative or a phthalocyanine compound. The dustproof plate has good optical performance, an infrared blocking function and weather resistance at the same time.

Description

Technical Field

[0001] This invention belongs to the field of optical device technology, specifically relating to an infrared blocking dustproof plate for vehicle-mounted HUDs and its preparation method. Background Technology

[0002] Head-up display (HUD), also known as a head-up display system, uses optical principles to project relevant vehicle information (such as vehicle speed, navigation, steering, and ADAS warnings) onto the vehicle's windshield. Drivers can understand key driving and navigation information without looking down at the instrument panel, reducing the time drivers take their eyes off the road and greatly improving driving safety.

[0003] Currently, HUD display devices generally suffer from technical problems such as high cavity temperature after direct sunlight exposure, affecting display quality and reducing the lifespan of critical components. If HUD dustproof panels were equipped with infrared blocking capabilities, it could potentially reduce the operating temperature of sensitive optical components such as LCD displays and TFT electronic display modules, improving display quality and enhancing the long-term reliability and lifespan of the HUD system. However, commonly used infrared blocking agents on the market, such as tungsten oxide and lanthanum hexaboride, primarily achieve their blocking function through localized surface plasmon resonance and partial reflection. Their inorganic nanoparticles are prone to agglomeration in pressure-sensitive adhesive systems, which severely affects the transparency and weather resistance of the adhesive, making them unsuitable for HUD dustproof panels.

[0004] Meanwhile, the image formed by the information projected onto the windshield of the vehicle by the HUD is a virtual image, requiring the display medium to meet the stringent optical performance requirements of the in-vehicle terminal. The S-polarization component of natural light (approximately 53% linearly polarized) is amplified after reflection from the windshield, creating glare interference. Traditional dust covers lack polarization selectivity and cannot effectively filter ambient glare (extinction ratio <100:1), resulting in reduced readability of HUD information. Furthermore, existing commercially available dustproof materials generally suffer from insufficient weather resistance.

[0005] Therefore, there is an urgent need to develop a new dustproof plate that, while meeting the requirements of polarizers for vehicle HUD dustproof plates, has good infrared blocking function, improves the weather resistance of the dustproof plate, and enhances the long-term reliability and service life of the HUD system. Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an infrared blocking dustproof plate for vehicle-mounted HUDs and its preparation method, wherein the dustproof plate simultaneously possesses good optical performance, infrared blocking function, and weather resistance.

[0007] To solve the above-mentioned technical problems, the first aspect of the present invention provides an infrared blocking dustproof plate, which includes, from the outside to the inside, a first protective film, a first support film, a first polarizing element protective film, a polarizing element film, a second polarizing element protective film, a second support film, and a second protective film. The first polarizing element protective film and the second polarizing element protective film are bonded to the polarizing element film by an adhesive, and the first support film and the second support film are bonded to the first polarizing element protective film and the second polarizing element protective film by an adhesive, respectively. The raw materials for preparing the adhesive include, by weight: 20-60 parts of acrylic resin, 0.1-1 parts of chelating agent, 0.05-5 parts of curing agent, 0.01-5 parts of silane coupling agent, 0.06-0.2 parts of infrared blocking agent, and 20-70 parts of organic solvent; the infrared blocking agent includes diamine derivatives and / or phthalocyanine derivatives.

[0008] Specifically, this invention improves the infrared blocking function of the dustproof panel by using an adhesive with infrared blocking properties to bond the polarizing element film and the support film. The adhesive primarily consists of acrylic resin, with diamine derivatives and / or phthalocyanine compounds acting as infrared blocking agents. The diamine and phthalocyanine derivatives achieve their infrared blocking function mainly through molecular vibration absorption, and they exhibit good compatibility with the acrylic resin adhesive system. While filtering infrared light, they also ensure the transmission of visible light, thus contributing to improved image contrast and brightness.

[0009] Therefore, the infrared blocking dustproof plate of the present invention can significantly reduce the temperature of the HUD cavity, thereby reducing the operating temperature of sensitive optical components such as LCD and TFT modules, preventing virtual image jitter, image distortion, color drift or even permanent damage caused by overheating, and thus effectively improving the long-term reliability and service life of the HUD system; on the other hand, it can effectively improve the weather resistance of the dustproof plate, so that it does not change color during use.

[0010] In some embodiments of the present invention, the diamine derivative is selected from at least one of diammonium perchlorate derivative, diammonium tetraphenylborate derivative, and diammonium iodide derivative; the phthalocyanine derivative is selected from at least one of copper phthalocyanine derivative, indium phthalocyanine derivative, and naphthalene phthalocyanine derivative. These raw materials all possess good infrared blocking properties and have no negative impact on the transparency of the dustproof panel.

[0011] In some embodiments of the present invention, the acrylic resin is selected from at least one of acrylic resins containing hydrophobic groups and epoxy-modified acrylic resins. The acrylic resin containing hydrophobic groups can be an acrylic resin containing long-chain alkyl groups, such as isooctyl acrylate (2-EHA), methyl methacrylate (MMA), or butyl acrylate (BA), to provide flexibility and basic adhesion; it can also be isobornyl acrylate to provide rigid, large-volume hydrophobic groups. The epoxy-modified acrylic resin is mainly obtained by introducing epoxy resins, such as neopentyl glycol diglycidyl ether and trimethylolpropane triglycidyl ether, into the acrylic ester resin.

[0012] In some embodiments of the present invention, the chelating agent is selected from at least one of hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and hypozinotriacetic acid.

[0013] In some embodiments of the present invention, the curing agent is selected from at least one of toluene diisocyanate trimer, hexamethylene diisocyanate trimer, isophorone diisocyanate trimer, and aliphatic epoxy resin.

[0014] In some embodiments of the present invention, the silane coupling agent is selected from at least one of 3-glycidyl etheroxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and 3-mercaptopropyltrimethoxysilane.

[0015] In some embodiments of the present invention, the organic solvent is selected from at least one of ethyl acetate, n-propyl acetate, and isopropyl acetate.

[0016] In some embodiments of the present invention, the polarizing element film is a PVA (polyvinyl alcohol) film dyed with dichroic azo dyes; the PVA film is a conventional dye-based PVA polarizing element in the art, which has high durability.

[0017] In some embodiments of the present invention, the thickness of the polarizing element film is 15-20 μm, the transmittance is 38-52%, and the polarization is ≥93%.

[0018] In some embodiments of the present invention, the first polarizing element protective film and the second polarizing element protective film are made of the same material, namely TAC (cellulose triacetate) film; and the thickness of both TAC films is 70-90 μm. The TAC film not only effectively blocks ultraviolet rays but also has high transparency, thus not affecting the clarity of the projected display information.

[0019] In some embodiments of the present invention, the total thickness of the first polarizing element protective film and the second polarizing element protective film is 60-170 μm. This thickness range can ensure that the film layer does not warp after being heated during use.

[0020] In some embodiments of the present invention, the first support film is an HC-PC film, that is, a PC (polycarbonate) film undergoing surface hardening treatment to give its surface an HC anti-scratch coating, thereby giving the first support film good scratch and wear resistance. Furthermore, when the first support film is used on the outside of the dustproof plate, the HC anti-scratch coating helps to further improve the long-term reliability and service life of the dustproof plate. The first support film can effectively support the polarizing element film and the first polarizing element protective film.

[0021] In some embodiments of the present invention, the pencil hardness of the HC-PC film is ≥HB, and the hardness is tested according to the GB / T6739-2006 standard, with a load weight of 750g during the test; the pencil hardness grades from high to low are: 6H, 5H, 4H, 3H, 2H, H, HB, B, 2B, 3B, 4B, 5B, 6B.

[0022] In some embodiments of the present invention, the infrared blocking rate of the first support film is 30-60%.

[0023] In some embodiments of the present invention, the second support film is a PC film with an infrared blocking rate of 30-60%. The surface of the second support film may not undergo surface hardening treatment. When in use, the second support is located on the inner side of the dustproof plate, i.e., the side closer to the projection, and is mainly used to support the polarizing element film and the second polarizing element protective film. Simultaneously, both the first and second support films have certain infrared blocking properties, which, together with the adhesive, improve the infrared blocking performance of the dustproof plate.

[0024] In some embodiments of the present invention, the thickness of both the first support film and the second support film is 120-150 μm.

[0025] In some embodiments of the present invention, the first protective film and the second protective film are each independently selected from PET (ethylene phthalate) film or PE (polyethylene) film, and the thickness of both the first protective film and the second protective film is 30-100 μm. Preferably, the first protective film and the second protective film are made of different colored materials to facilitate the distinction between the first support film and the second support film during use.

[0026] In some embodiments of the present invention, the adhesive may be a commonly used adhesive in the art, such as an adhesive from Mitsubishi Chemical Corporation, which is prepared by mixing PVA powder into an aqueous solution with a crosslinking agent.

[0027] A second aspect of the present invention provides a method for preparing the above-mentioned infrared blocking dustproof plate, comprising the following steps: An adhesive is used to bond the first polarizing element protective film and the second polarizing element protective film to the upper and lower surfaces of the polarizing element film, respectively. Then, an adhesive is used to bond the first support film and the second support film to the surfaces of the first polarizing element protective film and the second polarizing element protective film, respectively. Finally, the first protective film and the second protective film are laminated onto the surfaces of the first support film and the second support film, respectively, to obtain the infrared blocking dustproof plate.

[0028] In some embodiments of the present invention, the preparation process of the adhesive includes the following steps: Acrylic resin, chelating agent, curing agent and silane coupling agent are added to a portion of organic solvent and mixed to prepare solution A; Add the infrared blocking agent to the remaining organic solvent, mix, and obtain solution B; The adhesive is prepared by mixing solution A and solution B.

[0029] In some embodiments of the present invention, the mixing method is to stir at 1000-1500 rpm for 2-5 minutes at room temperature.

[0030] In some embodiments of the present invention, the mass ratio of the organic solvent in solution A and solution B is (35-50):(50-65).

[0031] A third aspect of the present invention provides a vehicle head-up display device, the vehicle head-up display device including the above-mentioned infrared blocking dustproof plate.

[0032] Compared with the prior art, the above-described technical solution of the present invention has at least the following technical effects or advantages: (1) The present invention improves the infrared blocking function of the dustproof plate by using an adhesive with infrared blocking function to bond the polarizing element film and the support film. The adhesive introduces specific diamine derivatives and / or phthalocyanine compounds as infrared blocking agents into the acrylic resin adhesive, which can ensure the transmittance of visible light and improve the contrast and brightness of the image.

[0033] (2) The infrared blocking dustproof plate of the present invention has a single light transmittance of ≤20% in the infrared range (780-1100nm), which has good infrared blocking function. It can not only significantly reduce the temperature of the HUD cavity, improve the long-term reliability and service life of the HUD system, and meet the high reliability test requirements of 105℃×1000H and 85℃×85%×1000H; it can also effectively improve the weather resistance of the dustproof plate and prevent discoloration during use. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of the infrared blocking dustproof plate of the present invention. Detailed Implementation

[0035] The present invention will now be described in detail with reference to embodiments to facilitate understanding of the invention by those skilled in the art. It is particularly important to note that the embodiments are merely illustrative of the invention and should not be construed as limiting the scope of protection of the invention. Non-essential improvements and adjustments made to the invention by those skilled in the art based on the above description should still fall within the scope of protection of the invention. Furthermore, all raw materials mentioned below, unless otherwise specified, are commercially available products; all process steps or preparation methods not mentioned in detail are process steps or preparation methods known to those skilled in the art.

[0036] like Figure 1 As shown, the infrared blocking dustproof plate of the present invention comprises, from the outside to the inside, a first protective film 401, a first support film 301, a first polarizing element protective film 201, a polarizing element film 100, a second polarizing element protective film 202, a second support film 302, and a second protective film 402. The first polarizing element protective film 201 and the second polarizing element protective film 202 are bonded to the polarizing element film using an adhesive. The first support film 301 and the second support film 302 are bonded to the first polarizing element protective film 201 and the second polarizing element protective film 202 respectively using adhesive.

[0037] Example 1 An infrared blocking dustproof plate comprises, from the outside to the inside, a first protective film, a first supporting film, a first polarizing element protective film, a polarizing element film, a second polarizing element protective film, a second supporting film, and a second protective film; the first polarizing element protective film and the second polarizing element protective film are bonded to the polarizing element film by an adhesive, and the first supporting film and the second supporting film are bonded to the first polarizing element protective film and the second polarizing element protective film by adhesives, respectively.

[0038] Among them, the polarizing element film is a PVA film with a thickness of 15-20μm, a transmittance of 44%, and a polarization of 98%.

[0039] Both the first and second polarizing element protective films are TAC films, and the thickness of the two TAC films is the same, 80 μm.

[0040] The first supporting film is an HC-PC film with a hardness of HB, an infrared blocking rate of 44-46%, and a thickness of 120-150μm.

[0041] The second support film is a PC film with an infrared blocking rate of 44-46% and a thickness of 120-150μm.

[0042] The first protective film is a PET film, with a thickness of 30-100μm.

[0043] The second protective film is a PE film, with a thickness of 30-100μm.

[0044] The adhesive is an adhesive manufactured by Mitsubishi Chemical Corporation.

[0045] The raw materials for preparing the adhesive, by weight, include: 20 parts isooctyl acrylate, 1 part hydroxyethylidene diphosphonic acid, 0.5 parts toluene diisocyanate trimer, 0.5 parts 3-glycidyl etheroxypropyltrimethoxysilane, 0.08 parts diammonium perchlorate derivative (D-1000 produced by Gaoxiang Company), and 75 parts ethyl acetate.

[0046] The preparation process of the adhesive includes the following steps: Isooctyl acrylate, hydroxyethylidene diphosphonic acid, toluene diisocyanate trimer and 3-glycidyl ether oxypropyltrimethoxysilane were added to a portion of ethyl acetate (50 wt%) in a certain mass ratio and stirred evenly to obtain solution A; The diammonium perchlorate derivative was added to the remaining ethyl acetate (50 wt%) and stirred until homogeneous to obtain solution B; The solutions A and B are mixed and stirred until homogeneous to obtain the adhesive.

[0047] The preparation method of the above-mentioned infrared blocking dustproof plate includes the following steps: An adhesive is used to bond the first polarizing element protective film and the second polarizing element protective film to the upper and lower surfaces of the polarizing element film, respectively. Then, an adhesive is used to bond the first support film and the second support film to the surfaces of the first polarizing element protective film and the second polarizing element protective film, respectively. Finally, the first protective film and the second protective film are laminated to the surfaces of the first support film and the second support film, respectively, to obtain the infrared blocking dustproof plate of this embodiment.

[0048] Example 2 An infrared blocking dustproof plate comprises, from the outside to the inside, a first protective film, a first supporting film, a first polarizing element protective film, a polarizing element film, a second polarizing element protective film, a second supporting film, and a second protective film; the first polarizing element protective film and the second polarizing element protective film are bonded to the polarizing element film by an adhesive, and the first supporting film and the second supporting film are bonded to the first polarizing element protective film and the second polarizing element protective film by adhesives, respectively.

[0049] Among them, the polarizing element film is a PVA film with a thickness of 15-20μm, a transmittance of 44%, and a polarization of 98%.

[0050] Both the first and second polarizing element protective films are TAC films, and the thickness of the two TAC films is the same, 80 μm.

[0051] The first supporting film is an HC-PC film with a hardness of HB, an infrared blocking rate of 44-46%, and a thickness of 120-150μm.

[0052] The second support film is a PC film with an infrared blocking rate of 44-46% and a thickness of 120-150μm.

[0053] The first protective film is a PET film, with a thickness of 30-100μm.

[0054] The second protective film is a PE film, with a thickness of 30-100μm.

[0055] The adhesive is an adhesive manufactured by Mitsubishi Chemical Corporation.

[0056] The raw materials for preparing the adhesive, by weight, include: 20 parts methyl methacrylate, 1 part hydroxyethylidene diphosphonic acid, 0.5 parts toluene diisocyanate trimer, 0.5 parts 3-glycidyl etheroxypropyltrimethoxysilane, 0.12 parts diammonium perchlorate derivative (D-1000 produced by Gaoxiang Company), and 75 parts ethyl acetate.

[0057] The preparation process of the adhesive in Example 2 and the preparation method of the infrared blocking dustproof board are the same as those in Example 1.

[0058] Example 3 An infrared blocking dustproof plate comprises, from the outside to the inside, a first protective film, a first supporting film, a first polarizing element protective film, a polarizing element film, a second polarizing element protective film, a second supporting film, and a second protective film; the first polarizing element protective film and the second polarizing element protective film are bonded to the polarizing element film by an adhesive, and the first supporting film and the second supporting film are bonded to the first polarizing element protective film and the second polarizing element protective film by adhesives, respectively.

[0059] Among them, the polarizing element film is a PVA film with a thickness of 15-20μm, a transmittance of 44%, and a polarization of 98%.

[0060] Both the first and second polarizing element protective films are TAC films, and the thickness of the two TAC films is the same, 80 μm.

[0061] The first supporting film is an HC-PC film with a hardness of HB, an infrared blocking rate of 44-46%, and a thickness of 120-150μm.

[0062] The second support film is a PC film with an infrared blocking rate of 44-46% and a thickness of 120-150μm.

[0063] The first protective film is a PET film, with a thickness of 30-100μm.

[0064] The second protective film is a PE film, with a thickness of 30-100μm.

[0065] The adhesive is an adhesive manufactured by Mitsubishi Chemical Corporation.

[0066] The raw materials for preparing the adhesive, by weight, include: 20 parts neopentyl glycol diglycidyl ether, 1 part hydroxyethylidene diphosphonic acid, 0.5 parts toluene diisocyanate trimer, 0.5 parts 3-glycidyl etheroxypropyltrimethoxysilane, 0.2 parts copper phthalocyanine derivative (1,4,8,11,15,18,22,25-octabutoxy-29H,31H-phthalocyanine produced by Xi'an Ruixi Biotechnology Co., Ltd.), and 75 parts ethyl acetate.

[0067] The preparation process of the adhesive in Example 3 and the preparation method of the infrared blocking dustproof board are the same as those in Example 1.

[0068] Comparative Example 1 The only difference between Comparative Example 1 and Example 1 is that the raw materials used to prepare the adhesive do not contain diammonium perchlorate derivatives.

[0069] Comparative Example 2 The only difference between Comparative Example 2 and Example 1 is that the raw materials for preparing the adhesive do not contain diammonium perchlorate derivatives, and the first and second support films do not have infrared blocking properties.

[0070] Comparative Example 3 The only difference between Comparative Example 3 and Example 1 is that the first and second support films do not have infrared blocking properties.

[0071] Comparative Example 4 The only difference between Comparative Example 4 and Example 1 is that the amount of diammonium perchlorate derivative in the raw materials for preparing the adhesive is lower, at 0.04 parts by weight.

[0072] Comparative Example 5 The only difference between Comparative Example 5 and Example 1 is that an equal amount of lanthanum hexaboride was used instead of the diammonium perchlorate derivative in Example 1 in the raw materials for preparing the adhesive.

[0073] Comparative Example 6 The only difference between Comparative Example 6 and Example 1 is that an equal amount of tungsten oxide is used to replace the diammonium perchlorate derivative in Example 1 in the raw materials for preparing the adhesive.

[0074] Performance testing The infrared blocking performance and weather resistance of the infrared blocking dustproof panel samples prepared in Examples 1-3 and Comparative Examples 1-6 were tested. Specifically, the infrared blocking performance was characterized by the light transmittance and cooling performance of the infrared blocking dustproof panel. The specific experimental procedure was as follows: The transmittance of a single dustproof panel and two parallel dustproof panels was tested in visible light (420-680nm), 350nm, and infrared light (780-1100nm) using a Hitachi UH4150 spectrophotometer. The uniformity of the appearance of the dustproof panels was also observed. The results are shown in Table 1.

[0075] Table 1:

[0076] As shown in Table 1, the infrared-blocking dustproof panels prepared in Examples 1-3, compared with Comparative Example 1 (without infrared blocking agent but with infrared blocking properties in the support layer), Comparative Example 2 (without infrared blocking agent and no infrared blocking properties in the support layer), and Comparative Example 3 (with infrared blocking agent but no infrared blocking properties in the support layer), exhibit significantly lower transmittance in the infrared region (780-1100nm) and infrared absorptivity greater than 80%. Meanwhile, Comparative Example 4, due to its excessively low infrared blocking agent content, shows a correspondingly higher transmittance in the infrared region. Comparative Example 5, using lanthanum hexaboride as the infrared blocking agent, results in a decrease in transmittance in the visible light region. In Comparative Example 6, tungsten oxide, due to poor compatibility with the acrylic resin adhesive system, cannot be uniformly dispersed, leading to particulate product precipitation, which affects the appearance of the polarizer and causes inaccurate data testing due to the particles.

[0077] A xenon lamp test chamber (Q-Lab XE-3-HSE) was used for simulation. The dustproof plates prepared in Example 1 and Comparative Example 2 were attached to the surface of the HUD simulation box, and the thermometer was placed inside the box. The temperature before and after entering the xenon lamp test chamber was recorded to obtain the data. The results are shown in Table 2.

[0078] Table 2:

[0079] As shown in Table 2, Example 1, due to the addition of a specific infrared blocking agent to the adhesive and the infrared blocking properties of the first and second support films, exhibited a significant temperature reduction compared to the dustproof plate of Comparative Example 2, which lacked an infrared blocking agent and whose support films had no infrared properties, under the same time conditions. This verifies that, under simulated sunlight irradiation in a xenon lamp aging instrument, the infrared blocking function can significantly reduce the operating temperature of sensitive optical components such as LCDs and TFT modules.

[0080] Weather resistance was measured using a spectrophotometer (Hitachi UH4150). After the dustproof board was cut and attached to one side of the glass, it was defoamed in a high-temperature and high-pressure defoaming machine (Yongquan YQ-E0822) and then placed in a temperature and humidity test chamber (ESPEC GPS-4) for 1000 hours of dry and wet temperature simulation test. The optical data before and after were measured by the spectrophotometer to obtain the weather resistance performance. The results are shown in Table 3.

[0081] Table 3:

[0082] Table 3 shows that the dustproof panels prepared in Examples 1-3 and Comparative Examples 1-4 exhibited similar optical changes after weathering at 105°C for 1000 hours, 85°C for 1000 hours, and 85% humidity for 1000 hours, respectively. Neither the clarity nor the hue showed significant changes, meeting the requirements for polarizers used in vehicle HUD dust covers. This demonstrates that the introduction of the infrared blocking agent did not negatively impact the weather resistance of the dustproof panels. Comparative Example 5 affected the transmittance in the visible light range, and Comparative Example 6 contained particles that affected the appearance; therefore, no weathering tests were conducted on Comparative Example 6.

[0083] For those skilled in the art, several simple deductions or substitutions can be made without departing from the inventive concept, without requiring creative effort. Therefore, any simple improvements made to this invention by those skilled in the art based on the disclosure of this invention should be within the scope of protection of this invention. The above embodiments are preferred embodiments of this invention, and all processes similar to this invention and equivalent changes should fall within the scope of protection of this invention.

Claims

1. An infrared blocking dustproof plate, characterized in that, From the outside to the inside, it includes a first protective film, a first support film, a first polarizing element protective film, a polarizing element film, a second polarizing element protective film, a second support film, and a second protective film. The first polarizing element protective film and the second polarizing element protective film are bonded to the polarizing element film by an adhesive, and the first support film and the second support film are bonded to the first polarizing element protective film and the second polarizing element protective film by an adhesive, respectively. The raw materials for preparing the adhesive include, by weight: 20-60 parts of acrylic resin, 0.1-1 parts of chelating agent, 0.05-5 parts of curing agent, 0.01-5 parts of silane coupling agent, 0.06-0.2 parts of infrared blocking agent, and 20-70 parts of organic solvent; the infrared blocking agent includes diamine derivatives and / or phthalocyanine derivatives.

2. The infrared blocking dustproof plate according to claim 1, characterized in that, The diamine derivative is selected from at least one of perchlorate diammonium derivative, tetraphenylborate diammonium derivative, and iodide diammonium derivative. And / or, the phthalocyanine derivative is selected from at least one of copper phthalocyanine derivatives, indium phthalocyanine derivatives, and naphthalene phthalocyanine derivatives.

3. The infrared blocking dustproof plate according to claim 1 or 2, characterized in that, The acrylic resin is selected from at least one of acrylic resins containing hydrophobic groups and epoxy-modified acrylic resins. And / or, the chelating agent is selected from at least one of hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and hypozinotriacetic acid; And / or, the curing agent is selected from at least one of toluene diisocyanate trimer, hexamethylene diisocyanate trimer, isophorone diisocyanate trimer, and aliphatic epoxy resin; And / or, the silane coupling agent is selected from at least one of 3-glycidyl etheroxypropyltrimethoxysilane, 3-aminopropyltriethoxysilane, and 3-mercaptopropyltrimethoxysilane; And / or, the organic solvent is selected from at least one of ethyl acetate, n-propyl acetate, and isopropyl acetate.

4. The infrared blocking dustproof plate according to claim 1, characterized in that, The polarizing element film is a PVA film dyed with dichroic azo dye; and the thickness of the polarizing element film is 15-20 μm, the transmittance is 38-52%, and the polarization is ≥93%.

5. The infrared blocking dustproof plate according to claim 1, characterized in that, The first polarizing element protective film and the second polarizing element protective film are made of the same material, namely TAC film; and the thickness of both TAC films is 70-90μm.

6. The infrared blocking dustproof plate according to claim 1, characterized in that, The first support film is an HC-PC film, the pencil hardness of the HC-PC film is ≥HB, and the infrared blocking rate of the first support film is 30-60%. And / or, the second support film is a PC film; And / or, the thickness of both the first support film and the second support film is 120-150 μm.

7. The infrared blocking dustproof plate according to claim 1, characterized in that, The first protective film and the second protective film are independently selected from PET film or PE film, and the thickness of the first protective film and the second protective film is 30-100μm.

8. A method for preparing an infrared blocking dustproof plate as described in any one of claims 1-7, characterized in that, Includes the following steps: An adhesive is used to bond the first polarizing element protective film and the second polarizing element protective film to the upper and lower surfaces of the polarizing element film, respectively. Then, an adhesive is used to bond the first support film and the second support film to the surfaces of the first polarizing element protective film and the second polarizing element protective film, respectively. Finally, the first protective film and the second protective film are laminated onto the surfaces of the first support film and the second support film, respectively, to obtain the infrared blocking dustproof plate.

9. The method for preparing the infrared blocking dustproof plate according to claim 8, characterized in that, The preparation process of the adhesive includes the following steps: Acrylic resin, chelating agent, curing agent and silane coupling agent are added to a portion of organic solvent and mixed to prepare solution A; Add the infrared blocking agent to the remaining organic solvent, mix, and obtain solution B; The adhesive is prepared by mixing solution A and solution B.

10. A vehicle-mounted head-up display device, characterized in that, The vehicle head-up display device includes the infrared blocking dustproof plate as described in any one of claims 1-7.

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