An infrared-transmissive intelligent exterior trim film layer and preparation method thereof

Abstract

The present invention belongs to the technical field of automobile exterior parts, and specifically relates to an infrared-transmissive intelligent exterior part film layer and a preparation method thereof. In the technical solution of the present invention, an infrared-transmissive intelligent exterior part film layer comprises a material layer and a front protection layer and an infrared-transmissive film layer located on both sides of the material layer, wherein the infrared-transmissive film layer is close to an infrared light source, the material layer and the infrared-transmissive film layer are bonded by an adhesive layer, the infrared-transmissive film layer is a PET infrared-transmissive film layer, and the initial transmittance of the 905nm band is 93-96%. The preparation method is to coat a 30-50 μm thick permeability-enhancing liquid on a PET film sheet and then perform photocuring to achieve the infrared permeability-enhancing effect, and the permeability-enhancing liquid comprises the following components in mass percentage: 45-55% polyacrylic acid resin, 3-5% hollow silica particles, 0.5-1.0% maleic anhydride compatibilizer, 40-50% solvent, and 0.5-1.0% curing agent. The PET infrared-transmissive film layer is obtained by using the permeability-enhancing liquid, and a direct bonding method is adopted, without the need for an optical coating process, to achieve the infrared-transmissive function of the intelligent exterior part.

Description

Technical Field

[0001] The present invention belongs to the technical field of automobile exterior decoration parts, and in particular relates to an infrared-transmissive intelligent exterior decoration part film layer and a preparation method thereof. Background Art

[0002] Automotive exterior parts refer to front and rear guard covers, front frame, rear spoiler, side skirts, anti-scratch strips, wheel eyebrows, trims, pillar trims, grilles, deflectors, fenders and other structural parts related to the aerodynamic performance of the vehicle or that play a decorative function. They also include functional parts such as wipers, rearview mirrors, front and rear combination lights, fog lights, etc. With the development of technology, automotive exterior parts not only play a decorative function, but also play more functions and roles. Under the wave of intelligent driving, more and more smart sensors are used in cars (such as laser radar, infrared cameras and other products). In order to meet normal use in specific weather and environment, smart exterior parts with infrared transmission function have become an important research direction.

[0003] Infrared rays are divided into near infrared (e.g. wavelength 0.7μm ~ 2μm), mid infrared (e.g. wavelength 3μm ~ 5μm) and far infrared (e.g. wavelength 8μm ~ 13μm) according to their wavelength bands. In general, exterior trim is plated with an optical infrared-transmitting film layer to achieve the effect of transmitting infrared rays of different wavelengths. There are currently three main ways to achieve optical thin films: physical vapor deposition (PVD), chemical vapor deposition (CVD), and chemical liquid deposition (CLD). Before coating, the substrate to be plated needs to be ultrasonically cleaned or plasma treated to increase adhesion, and requires a combination of special machines and specific tooling. Not only is the cost high, but the film layer also has poor aging resistance, and the actual application effect is not good. Summary of the invention

[0004] The purpose of the present invention is to solve the above technical problems and provide a film layer which has infrared transmission function and can improve infrared transmittance without affecting the original appearance and function of the product.

[0005] The technical solution of the present invention provides an infrared-transmissive smart exterior trim film layer, comprising a material layer and a front protection layer and an infrared-transmissive film layer located on both sides of the material layer, wherein the infrared-transmissive film layer is close to an infrared light source.

[0006] The intelligent exterior decoration film layer of the present invention can transmit infrared and improve the infrared transmittance function at the same time, and on the premise of increasing the infrared transmission effect, it does not affect the original appearance and function of the product.

[0007] Furthermore, the material layer and the infrared-transmitting film layer of the above-mentioned intelligent exterior trim film layer are bonded by an adhesive layer.

[0008] Furthermore, the front protection layer is a transparent acrylic UV curing coating with a thickness of 5.0 to 8.0 μm.

[0009] Furthermore, the UV curing energy is 2000-3000 mj, and the time is 30-50 min.

[0010] Furthermore, the material layer is one of polycarbonate (PC) and polymethyl methacrylate (PMMA), which is fully transparent or can transmit infrared light in the wavelength band of 905 to 1550 nm, and has a transmittance of 88 to 90%.

[0011] Furthermore, the thickness of the material layer is 1.8 to 2.5 mm.

[0012] Furthermore, when the material layer structure is a single curved surface or a flat surface without any irregular shape, the adhesive layer is a high temperature resistant silicone-based or acrylic optically transparent OCA tape with a thickness of 40 to 200 μm, a transmittance of 99.95 to 99.99%, and a pull-out force of 10 to 15 N. This ensures that the overall fit is tight and there is no blistering in harsh environments, so that the product can work normally.

[0013] Furthermore, the adhesive layer can be pressed in a vacuum environment with a vacuum degree of -100 to -90 MPa, a pressing temperature of 40 to 55°C, a pressure of 5 to 7 kg, and a holding time of 5 to 15 seconds, which can ensure that no bubbles are generated during pressing and improve the performance stability of the exterior film layer.

[0014] Furthermore, the infrared-transmitting film layer is a PET infrared-transmitting film layer, and the initial transmittance in the 905nm band is 93-96%.

[0015] The preparation method of the above-mentioned PET infrared-transmitting film layer is to coat a 30-50 μm thick anti-transmittance liquid on the PET film and then perform light curing to achieve the infrared anti-transmittance effect.

[0016] Furthermore, the permeability enhancement liquid includes the following components in mass percentage: 45-55% polyacrylic acid resin, 3-5% hollow silica particles, 0.5-1.0% maleic anhydride compatibilizer, 40-50% solvent, and 0.5-1.0% curing agent. After the permeability enhancement liquid is coated on the PET film, the infrared transmittance of the film can be increased from less than 89% to more than 94%. Silica particles with a hollow structure, when added to a coating or resin, can form nano-spaces inside, thereby adjusting the light curvature refractive index to achieve the purpose of improving transmittance.

[0017] Furthermore, the solvent is one or more of water, ethanol, isopropanol, and dimethyl sulfoxide.

[0018] Furthermore, the curing agent is one or more of a benzil curing agent, an alkyl phenone curing agent, a benzophenone curing agent, benzoin and its derivatives, and an acylphosphine oxide.

[0019] Furthermore, the permeability-enhancing liquid is obtained by mixing polyacrylic acid resin, hollow silica particles, maleic anhydride compatibilizer, solvent and curing agent with high-speed stirring for 5 to 10 minutes.

[0020] The present invention also provides a method for preparing the above-mentioned intelligent exterior trim film layer, comprising spraying a front protective layer on the surface of a material layer, and pasting a PET infrared-transmitting film layer on the other side of the material layer using an adhesive layer.

[0021] The present invention adopts a direct bonding method, which does not require an optical coating process to achieve the infrared transmission function of the smart exterior parts, avoids the failure of the infrared transmission function under high temperature and high humidity conditions, and has the advantages of high pass rate and low cost.

[0022] Furthermore, the curing time of the front protective layer is 15 to 30 minutes.

[0023] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0024] (1) Using an anti-permeability liquid to obtain a PET infrared-transmitting film layer, which is used as a film layer for smart exterior accessories, can realize the infrared-transmitting function of smart exterior accessories;

[0025] (2) Direct bonding is adopted, without the need for optical coating process, thus avoiding the failure of infrared transmission function under high temperature and high humidity conditions;

[0026] (3) The infrared transmittance of the infrared-transmissive smart exterior trim film obtained by the technical solution of the present invention can be increased by 1.0 to 1.5%;

[0027] (4) The preparation method of the present invention is simple and efficient, and has the advantages of high qualified rate and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a diagram of the film structure of the smart exterior trim obtained in the embodiment;

[0029] In the figure: 1-front protection layer, 2-material layer, 3-high temperature resistant silicone-based tape, 4-PET infrared transparent film layer. DETAILED DESCRIPTION

[0030] The technical scheme of the present invention is further described below by specific examples and accompanying drawings. It should be understood that the specific examples described herein are only used to help understand the present invention and are not used for specific limitations of the present invention. The accompanying drawings used herein are only for better illustrating the disclosure of the present invention and do not have a limiting effect on the scope of protection. Unless otherwise specified, the raw materials used in the embodiments of the present invention are all commonly used raw materials in the art, and the methods used in the embodiments are all conventional methods in the art.

[0031] Example 1

[0032] The preparation method of the film layer of the intelligent exterior decoration part of this embodiment adopts polycarbonate with an initial transmittance of 90% in the 905nm band as the material layer, sprays a front protective layer with a thickness of 5μm on the surface of the material layer with a thickness of 2.2mm, and uses a UV curing energy of 3000mj and a curing time of 30min. A PET infrared-transmitting film layer is adhered to the other side of the material layer using a 150μm thick high-temperature resistant silicone-based tape, and is pressed using a curved surface vacuum laminating device, with a vacuum degree of -100Mpa, a pressing temperature of 50°C, a pressure of 5kg, and a holding time of 10s to obtain the following Figure 1 The smart exterior trim film shown;

[0033] The preparation process of the PET infrared-transmitting film layer is to coat a 30 μm thick permeability-enhancing liquid on the PET film and then UV cure it. The permeability-enhancing liquid is obtained by mixing 54% polyacrylic acid resin, 4% hollow silica particles, 1.0 benzoin dimethyl ether, 1.0% PET-g-MAH and 40% water in a high-speed mixer at high speed for 5 minutes.

[0034] Example 2

[0035] The preparation method of the film layer of the intelligent exterior decoration part of this embodiment uses polymethyl methacrylate with an initial transmittance of 90% in the 905nm band as the material layer, sprays a front protective layer with a thickness of 6μm on the surface of the material layer with a thickness of 2.0mm, and the UV curing energy is 3000mj, and the curing time is 30min. On the other side of the material layer, a PET infrared-transmitting film layer is adhered with a 150μm thick acrylic optically transparent OCA tape, and is pressed using a curved surface vacuum laminating device, with a vacuum degree of -100Mpa, a pressing temperature of 50°C, a pressure of 5kg, and a holding time of 10s;

[0036] The preparation process of the PET infrared-transmitting film layer is to coat a 40 μm thick permeability-enhancing liquid on the PET film and then UV cure it. The permeability-enhancing liquid is obtained by mixing 52% polyacrylic acid resin, 5% hollow silica particles, 1.0% 2,4-dihydroxybenzophenone, 1.0% PET-g-MAH and 41% water in a high-speed mixer at high speed for 5 minutes.

[0037] Example 3

[0038] The only difference between this embodiment and embodiment 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 30 μm thick permeability-enhancing liquid on the PET film and then UV cure it. The permeability-enhancing liquid is prepared by mixing 51.2% polyacrylic acid resin, 4% hollow silica particles, 0.8% benzoin dimethyl ether, 1.0% PET-g-MAH and 43% water in a high-speed mixer at high speed for 5 minutes.

[0039] Example 4

[0040] The only difference between this embodiment and embodiment 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 20 μm thick permeability-enhancing liquid on the PET film.

[0041] Example 5

[0042] The only difference between this embodiment and embodiment 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 50 μm thick permeability-enhancing liquid on the PET film.

[0043] Example 6

[0044] The difference between this embodiment and embodiment 1 is that the permeability enhancement liquid is obtained by mixing 60% polyacrylic acid resin, 4% hollow silica particles, 0.8% benzoin dimethyl ether, 1.0% PET-g-MAH and 34.2% water in a high-speed mixer for 5 minutes.

[0045] Example 7

[0046] The difference between this embodiment and embodiment 1 is that the permeability enhancement liquid is obtained by mixing 40% polyacrylic acid resin, 4% hollow silica particles, 0.8 benzoin dimethyl ether, 1.0% PET-g-MAH and 54.2% water in a high-speed mixer for 5 minutes.

[0047] Comparative Example 1

[0048] The difference between this comparative example and Example 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 30 μm thick permeability-enhancing liquid on the PET film sheet and then UV cure it. The permeability-enhancing liquid is prepared by mixing 54% polyacrylic acid resin, 4% hollow silica particles, 1.0 benzoin dimethyl ether and 41% water in a high-speed mixer at high speed for 5 minutes.

[0049] Comparative Example 2

[0050] The difference between this comparative example and Example 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 30 μm thick permeability-enhancing liquid on the PET film and then UV cure it. The permeability-enhancing liquid is prepared by mixing 54% polyacrylic acid resin, 1.0% benzoin dimethyl ether, 1.0% PET-g-MAH and 44% water in a high-speed mixer at high speed for 5 minutes.

[0051] Comparative Example 3

[0052] The difference between this comparative example and Example 1 is that the preparation process of the PET infrared-transmitting film layer is to coat a 30 μm thick permeability-enhancing liquid on the PET film and then UV cure it. The permeability-enhancing liquid is prepared by mixing 54% polyacrylic acid resin, 4% hollow silica particles, 1.0% benzoin dimethyl ether, 1.0% silane coupling agent KH550 and 40% water in a high-speed mixer at high speed for 5 minutes.

[0053] In Examples 1-3, the PET infrared-transmitting film layer has a basic transmittance of generally 94-97%. After being attached to the product, the transmittance loss is only about 2%. The performance experiments are mainly reflected as follows: ① Double 85 (85% humidity, 85% temperature conditions) can meet 1000h, and the film layer has no undesirable phenomena such as shedding and blistering; ② High temperature resistance (110°C) can meet 1000h, and the film layer has no undesirable phenomena such as shedding and blistering; when the amount of permeability-enhancing liquid applied is too small, the infrared transmittance is low, when the amount of permeability-enhancing liquid applied is too much, the film layer is too thick, and shedding and blistering are prone to occur. When the content of hollow silica particles in the permeability-enhancing liquid is too little, the strengthening effect on the infrared transmittance is small. When the content of silica particles is too much, the permeability-enhancing liquid phase is uneven, the strength of the formed film layer is too hard, and it is easy to break, fall off and be uneven. When a silane coupling agent is used instead of a compatibilizer in the permeability-enhancing liquid, the uniformity of the system is significantly reduced, and the surface of the formed film layer is uneven, and it is easy to fall off and bulge.

[0054] Finally, it should be noted that the specific embodiments described herein are merely examples of the spirit of the present invention, and are not intended to limit the implementation methods of the present invention. Those skilled in the art of the present invention may make various modifications or supplements to the described embodiments or replace them in similar ways. 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. An infrared-transmissive smart exterior decoration film layer, characterized in that: It includes a material layer, a front protection layer and an infrared-transmitting film layer located on both sides of the material layer, and the infrared-transmitting film layer is close to the infrared light source; The infrared-transmitting film layer is a PET infrared-transmitting film layer, and the initial transmittance in the 905nm band is 93~96%; The preparation method of the PET infrared-transmitting film layer is to coat a 30-50 μm thick permeability-enhancing liquid on the PET film and then perform light curing; The permeability-enhancing liquid includes the following components in percentage by mass: 45-55% polyacrylic acid resin, 3-5% hollow silica particles, 0.5-1.0% maleic anhydride compatibilizer, 40-50% solvent, and 0.5-1.0% curing agent; The material layer and the infrared-transmitting film layer are bonded by an adhesive layer; The material layer is one of polycarbonate and polymethyl methacrylate, and the transmittance of infrared light in the 905~1550nm band is 88~90%.

2. The intelligent exterior decoration film layer according to claim 1, characterized in that: The front protective layer is a transparent acrylic UV curing coating with a thickness of 5.0~8.0μm.

3. The intelligent exterior decoration film layer according to claim 1, characterized in that: The adhesive layer is pressed in a vacuum environment, the vacuum degree is -100~-90Mpa, the pressing temperature is 40~55℃, the pressure is 5~7kg, and the pressure holding time is 5~15s.

4. A method for preparing a smart exterior decoration film layer according to claim 1, characterized in that: The process includes spraying a positive protective layer on the surface of the material layer, and sticking a PET infrared-transmitting film layer on the other side of the material layer using an adhesive layer.

Images