A light-cured film for a profiled composite material and a method for preparing the same

Abstract

The present application relates to the field of light solid film, and discloses a light solid film for special-shaped composite material and a preparation method thereof, the light solid film for special-shaped composite material comprises photocuring resin, tackifier, silica aerogel, flexible toughening agent, ultraviolet light catalyst, viscosity regulator, nano silicon, liquid crystal polymer, super-hydrophobic material, light-heat conversion material, reactive solvent and organic-inorganic composite material;After the light solid film coating is prepared, it is put into a vacuum degassing equipment to remove bubbles, and the light solid film coating after degassing is uniformly coated on the surface of the special-shaped composite material coated with tackifier, then the coated composite material is sent into an ultraviolet light curing equipment for curing by ultraviolet light irradiation;After curing treatment, the super-hydrophobic material is uniformly sprayed on the surface of the cured light solid film by using a spray gun, and the light solid film after curing is obtained by heating in a temperature control box until the resin is completely crosslinked, which can realize good adhesion on the surface of the special-shaped substrate.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of light-cured films, in particular to a light-cured film for profiled composite materials and a preparation method thereof. BACKGROUND

[0002] In modern manufacturing, profiled composite materials are increasingly widely used, especially in the automotive, aerospace, electronics, optics and other industries. As a high polymer material with excellent physical, optical and mechanical properties, polycarbonate (PC) material is widely used in these fields. Polycarbonate (PC) material is widely used in automotive exterior parts, electronic device housings, optical elements and other fields due to its excellent optical properties, impact resistance and heat resistance.

[0003] However, profiled processing and surface treatment of PC materials face a series of technical difficulties, especially when PC materials need to be laminated with other profiled composite materials. Due to the rigidity and surface hardness of PC materials, and often complex shape, the surface profile of the profiled substrate is often irregular, which makes it difficult for the film material to completely cover the surface during lamination, causing local warping, wrinkling or poor adhesion. Although there are a variety of film materials and forming processes for surface treatment of composite materials on the market, there is still a lack of a solution that can effectively solve the above problems for profiled PC composite materials in lamination. Therefore, it is of great application value and market demand to develop a light-cured film specifically for profiled PC composite materials and a preparation method thereof. SUMMARY

[0004] The purpose of this part is to provide a light-cured film for profiled composite materials and a preparation method thereof to solve the lamination problems of profiled PC composite material surface treatment in the prior art. The light-cured film can achieve good lamination on the surface of the profiled substrate, has excellent air exhaust performance, anti-rebound performance, and can adapt to complex shaped substrates, solving the lamination difficulties in the prior art.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] In one aspect, a light-cured film for profiled composite materials is provided, which comprises the following components by weight percentage:

[0007] 60-85% of light-cured resin;

[0008] 1-5% of tackifier;

[0009] 1-3% of silica aerogel;

[0010] 2-5% of flexible toughening agent;

[0011] UV light catalyst 0.5%~2%;

[0012] Viscosity regulator 1%~2%;

[0013] Nano-silicon 1%~3%;

[0014] Liquid crystal polymer (LCP) 5%~8%;

[0015] Super-hydrophobic material 1%~3%;

[0016] Photo-thermal conversion material 0.5%~1%;

[0017] Reactive solvent 2%~5%;

[0018] Organic-inorganic composite material 1%~3%.

[0019] As a further aspect of the present application: the viscosity of the light-cured resin is in the range of 100-1000 mPa·s, for forming a uniform film layer during coating and curing, the wavelength of the UV light for curing the light-cured resin is between 200-400 nm, and the curing time is 1-5 minutes.

[0020] As a further aspect of the present application: the light-cured resin is an epoxy resin, an acrylic resin, or a polyurethane resin.

[0021] As a further aspect of the present application: the tackifier is butyl acrylate (BA), octyl acrylate (OctA), or epoxy acrylate, for coating on the surface of the profiled composite material to form a viscosity-adjustable coating layer, to improve the adhesion of the light-cured resin to the surface of the profiled composite material, and to enhance the adhesion and durability of the film layer.

[0022] As a further aspect of the present application: the flexible toughening agent is polyurethane acrylate (PUA), polyurethane ether (PU Ether), silane-based acrylate, or polyacrylate toughening agent, for improving the flexibility, impact resistance, and low-temperature and high-temperature resistance of the film layer, to avoid cracking or deformation of the film layer under mechanical stress or temperature changes.

[0023] As a further aspect of the present application: the UV light catalyst is benzo i n, phenyl benzophenone (Benzo i n), or a photoinitiator BAPO, which can accelerate the cross-linking reaction of the resin under UV light irradiation, enhance the curing efficiency, and ensure complete curing of the film layer in a short time.

[0024] As a further aspect of the present application: the viscosity regulator is hydroxyethyl cellulose (HEC) or polyvinyl pyrrolidone (PVP), used to adjust the viscosity of the photocured resin, so as to have better fluidity and lower adhesion in the coating process, to ensure uniform coating and avoid the generation of bubbles or brush marks.

[0025] As a further aspect of the present application: the liquid crystal polymer is polyethylene terephthalate (PET) or liquid crystal polyamide (LCPs), used to enhance the thermal stability, mechanical strength and anti-aging performance of the photocured film, to improve the long-term durability of the film layer.

[0026] As a further aspect of the present application: the super-hydrophobic material is a fluororesin coating, fluorosilane trifluorochloroalkyl silane or nano-silicon dioxide coating, to give the film layer strong water-repellent and anti-fouling properties, to reduce the adhesion of water and oil, and to improve the performance of the film layer in wet or harsh environments.

[0027] As a further aspect of the present application: the photo-thermal conversion material is graphene, to improve the thermal conversion efficiency of the photocured film under ultraviolet light irradiation, to help optimize the thermal management of the composite material, and to enhance the high-temperature resistance of the film layer.

[0028] As a further aspect of the present application: the reactive solvent is butadiene, which helps the resin to dissolve and reduces the viscosity of the photocured film coating, facilitating the coating operation.

[0029] As a further aspect of the present application: the organic-inorganic composite material is siloxane, which provides better adhesion and surface modification function of the film layer of the photocured film, and enhances the chemical corrosion resistance and environmental stability of the film layer.

[0030] Another aspect of the present application provides a preparation method of a photocured film for a special-shaped composite material, comprising the following steps:

[0031] Prepare raw materials by weight percentage, add the reactive solvent to the reaction vessel and heat to 50-60℃, and add the photocured resin to the reactive solvent, stir until completely dissolved;

[0032] Slowly add the viscosity regulator to the reaction vessel, and add the silica aerogel, nano-silicon, liquid crystal polymer and organic-inorganic composite material to the reaction vessel, and disperse by ultrasonic or high-speed stirring to obtain a dispersion liquid;

[0033] After adding the flexible toughening agent to the dispersion liquid and continuing to stir until uniform, add the ultraviolet light catalyst and photo-thermal conversion material, and stir until uniform to obtain the photocured film coating;

[0034] The light-cured film coating is put into a vacuum degassing device, bubbles are removed by degassing, and the degassed light-cured film coating is uniformly coated on the profiled composite material surface coated with the adhesion promoter;

[0035] The coated composite material is sent into an ultraviolet light curing device, and ultraviolet light is used for irradiation and curing;

[0036] After the curing treatment, the super-hydrophobic material is uniformly sprayed on the surface of the cured light-cured film by using a spray gun, and the cured light-cured film is quality detected after being heated to complete resin crosslinking in a temperature control box. After the detection is completed, the light-cured film is packaged and stored.

[0037] As a further scheme of the present application, the light-cured film coating is put into a vacuum degassing device and degassed for 10-15 minutes.

[0038] As a further scheme of the present application, when the ultraviolet light is used for irradiation and curing, the wavelength range of the ultraviolet light is 200-400 nm, the ultraviolet light power is 200-300 mJ / cm 2 , and the curing time is 1-5 minutes. Under the irradiation of the ultraviolet light, the initiator in the light-cured resin starts to activate and promote the crosslinking reaction, and the film layer is cured within a few minutes.

[0039] As a further scheme of the present application, when the adhesion promoter is coated on the surface of the profiled composite material, the adhesion promoter is coated on the surface of the composite material by using a coating machine, the coating amount is 20-50 g / m 2 , the drying temperature is 40-60 DEG C, and the drying time is 1-3 minutes; and then the degassed light-cured film coating is uniformly coated on the surface of the profiled composite material coated with the adhesion promoter.

[0040] As a further scheme of the present application, when the super-hydrophobic material is uniformly sprayed on the surface of the cured light-cured film by using a spray gun, the coating amount of the super-hydrophobic material is 0.5-5 g / m 2 , the heating temperature is 60-100 DEG C, and the curing time is 20-60 minutes.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] The application provides a photocured film for a special-shaped composite material and a preparation method thereof. The prepared photocured film is significantly improved in surface functionality of the composite material by adding super-hydrophobic materials, light-heat conversion materials, nano-silicon, liquid crystal polymers (LCP) and the like. The photocured film not only has super-hydrophobicity, effectively resists the adhesion of water droplets and stains, and maintains the cleanliness of the composite material, but also enhances the ultraviolet resistance of the composite material, prolongs the service life, and by using liquid crystal polymers (LCP) and organic-inorganic composite materials, the photocured film has good flexibility and wear resistance, and also has excellent thermal stability and corrosion resistance, and can maintain long-term durability in harsh environments.

[0043] The photocured film for a special-shaped composite material and the preparation method thereof provided by the application not only have the firmness, durability and environmental protection of the photocured film, but also have super-hydrophobicity, self-cleaning, light-heat management and other functions, and are widely applicable to the surface protection of various special-shaped composite materials. The preparation method is simple, efficient and adaptable, and has a wide application prospect, especially in the fields of automobiles, aerospace, construction and electronics, and can greatly improve the performance and service life of the composite material. DETAILED DESCRIPTION

[0044] The above objects, features and advantages of the application will be more apparent from the following detailed description of the specific embodiments of the application.

[0045] In the following description, many specific details are set forth in order to provide a thorough understanding of the application. However, the application can be practiced without the specific details, other than those described herein, and it will be apparent to those skilled in the art that the application can be practiced in other ways than those described herein, and that the application is not limited to the specific embodiments disclosed below.

[0046] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent of or selected from other embodiments.

[0047] Embodiment 1

[0048] The embodiment of the application provides a photocured film for a special-shaped composite material and a preparation method thereof, and specifically as follows:

[0049] Preparation of raw materials:

[0050] The raw materials are prepared according to the following weight percentages:

[0051] Photocured resin (epoxy resin): 73%;

[0052] Tackifier (butyl acrylate): 3%;

[0053] Silica aerogel: 2%;

[0054] Flexible toughener (polyurethane acrylate): 3%;

[0055] UV light catalyst (benzoyl ethylene): 1%;

[0056] Viscosity regulator (hydroxyethyl cellulose, HEC): 1.2%;

[0057] Nano-silicon: 2%;

[0058] Liquid crystal polymer (polyethylene terephthalate, PET): 6%;

[0059] Super-hydrophobic material (fluororesin coating): 2%;

[0060] Light-heat conversion material (graphene): 0.8%;

[0061] Reactive solvent (butadiene): 4%;

[0062] Organic-inorganic composite (silicone): 2%.

[0063] The preparation steps of the light-cured film for the special-shaped composite material are as follows:

[0064] (1) Preparation of reaction solution:

[0065] Add the reactive solvent butadiene into the reaction container and heat to 55°C. Then add the light-cured resin (polyurethane acrylate) and stir until completely dissolved to form a uniform resin solution.

[0066] (2) Dispersion and homogenization:

[0067] Slowly add the viscosity regulator (HEC) to the resin solution, then add the silica aerogel, nano-silicon, liquid crystal polymer (PET), and organic-inorganic composite (silicone). Use ultrasonic or high-speed stirring equipment to disperse the mixture to ensure that each component is evenly dispersed, obtaining a dispersion liquid.

[0068] (3) Add toughener and catalyst:

[0069] Add the flexible toughener (polyurethane acrylate) to the dispersion liquid and continue to stir until uniform. Then add the UV light catalyst (benzoyl ethylene) and light-heat conversion material (graphene), and stir again until uniform to obtain the final light-cured film coating.

[0070] (4) Degassing and coating:

[0071] The light-cured film paint is placed in a vacuum degassing device and degassed for 10 minutes to remove bubbles. Then the degassed paint is evenly coated on the profiled composite material surface which has been coated with an adhesion promoter. The adhesion promoter is coated with butyl acrylate (BA) on the composite material surface, with a coating amount of 40 g / m 2 , and the drying temperature after coating is 50°C, and the drying time is 2 minutes.

[0072] (5) UV curing:

[0073] The coated composite material is sent into a UV curing device for UV irradiation in the wavelength range of 200-400 nm, with a UV power of 250 mJ / cm 2 , and the irradiation time is 3 minutes. The initiator in the light-cured resin is activated under UV irradiation, promoting crosslinking reaction, and the film layer is cured in a short time.

[0074] (6) Spraying super-hydrophobic material:

[0075] A fluororesin coating is uniformly sprayed on the surface of the cured light-cured film using a spray gun, with a spraying amount of 2 g / m 2 . Then the sprayed composite material is sent into a temperature control box and heated to 80°C, and the curing time is 30 minutes to ensure complete crosslinking of the resin.

[0076] (7) Final testing and packaging:

[0077] The cured light-cured film is tested for quality to ensure that the film layer is uniform, bubble-free and crack-free. After passing the test, the light-cured film is packaged and stored.

[0078] Performance test:

[0079] Film thickness test: The thickness of the light-cured film is measured using a digital thickness gauge, and three positions are randomly selected for testing, and the film thickness at each position is recorded, where the film thickness at the three positions is 13.6 μm, 13.5 μm and 13.8 μm, respectively, and the film thickness at each position is within the range of 12-15 μm, meeting the design requirements.

[0080] Surface contact angle test: The contact angle of the light-cured film surface is tested using a contact angle measuring instrument for super-hydrophobicity test, where the measured contact angle is 160°, indicating that the film layer has very good super-hydrophobicity and can effectively prevent water and dirt.

[0081] Mechanical strength and flexibility test: The light-cured film is tested for tensile strength and elongation at break using a tensile testing machine. The test results are as follows:

[0082] 1. Tensile strength: 45 MPa;

[0083] 2. Elongation at break: 8%.

[0084] The results show that the film layer has good mechanical strength and flexibility, and can effectively resist external force impact.

[0085] Thermal stability test: The thermal stability of the photocured film was tested using a thermal gravimetric analysis (TGA) instrument, and the results showed that the film layer was stable below 250℃ with a weight loss of less than 5%; this result indicates that the film layer has good thermal stability.

[0086] Curing efficiency test: The ultraviolet light absorption and crosslinking during the curing process were monitored by an ultraviolet curing test instrument, and the results showed that the curing efficiency was 98%, indicating that the crosslinking reaction of the resin under ultraviolet light irradiation was very efficient.

[0087] The data sheet is as follows:

[0088]

[0089]

[0090] The experimental results show that:

[0091] Film layer thickness: meets the design requirements, uniform and bubble-free, thickness is 12-15μm; superhydrophobicity: contact angle reaches 160°, with excellent water and stain resistance; mechanical strength and flexibility: tensile strength is 45MPa, elongation at break is 8%, with good flexibility; thermal stability: stable below 250℃ with a weight loss of less than 5%; curing efficiency: curing efficiency reaches 98% under ultraviolet light irradiation, resin crosslinking is complete, and the film layer is stable.

[0092] The photocured film prepared in this embodiment has excellent superhydrophobicity, mechanical strength, chemical corrosion resistance and thermal stability, and is suitable for surface coating of various irregular composite materials, which can effectively improve the performance of composite materials in harsh environments.

[0093] Example 2

[0094] The embodiments of the present application provide a photocured film for irregular composite materials and a preparation method thereof, as follows:

[0095] Raw material preparation:

[0096] Prepare raw materials in the following weight percentages:

[0097] Photocured resin (acrylic resin): 69%;

[0098] Tackifier (acrylic octyl ester): 4%;

[0099] Silica aerogel: 3%;

[0100] Flexible toughener (polyurethane ether): 4.5%;

[0101] UV light catalyst (phenyl benzophenone): 1.5%;

[0102] Viscosity regulator (polyvinyl pyrrolidone, PVP): 2%;

[0103] Nano-silicon: 1.5%;

[0104] Liquid crystal polymer (liquid crystal polyamide, LCPs): 8%;

[0105] Super-hydrophobic material (fluorosilane trifluorochloroalkyl silane): 1.5%;

[0106] Photo-thermal conversion material (graphene): 1%;

[0107] Reactive solvent (butadiene): 3%;

[0108] Organic-inorganic composite (siloxane): 1%.

[0109] The preparation steps of the light-cured film for the special-shaped composite material are as follows:

[0110] (1) Preparation of the reaction solution:

[0111] The reactive solvent butadiene is added to the reaction container and heated to 60°C. Then the light-cured resin (polyurethane ether) is added and stirred until completely dissolved to form a uniform resin solution.

[0112] (2) Dispersion and homogenization:

[0113] The viscosity regulator (polyvinyl pyrrolidone) is slowly added to the resin solution, followed by the addition of silica aerogel, nano-silicon, liquid crystal polymer (liquid crystal polyamide), and organic-inorganic composite (siloxane). The mixture is dispersed using ultrasonic or high-speed stirring equipment to ensure that each component is evenly dispersed, obtaining a dispersion liquid.

[0114] (3) Addition of toughener and catalyst:

[0115] The flexible toughener (polyurethane ether) is added to the dispersion liquid and stirred until uniform. Then the UV light catalyst (phenyl benzophenone) and the photo-thermal conversion material (graphene) are added and stirred again until uniform, obtaining the final light-cured film coating.

[0116] (4) Degassing and coating:

[0117] The light-cured film coating is placed in a vacuum degassing device and degassed for 15 minutes to remove bubbles. Then the degassed coating is evenly applied to the profiled composite material surface which has been pre-coated with an adhesion promoter. The adhesion promoter is applied to the composite material surface using octyl acrylate (OctA) at a coating amount of 50 g / m 2 , and the drying temperature after coating is 60°C, and the drying time is 3 minutes.

[0118] (5) UV light curing:

[0119] The coated composite material is sent to a UV light curing device for UV light irradiation in the wavelength range of 200-400 nm, with a UV light power of 300 mJ / cm 2 and an irradiation time of 1 minute. The initiator in the light-cured resin is activated under UV light irradiation, promoting cross-linking reaction, and the film layer is cured in a short time.

[0120] (6) Spraying super-hydrophobic material:

[0121] Fluorosilane trifluorochloroalkylsilane is uniformly sprayed on the surface of the cured light-cured film using a spray gun, with a spraying amount of 5 g / m 2 . Then the sprayed composite material is sent to a temperature control box and heated to 100°C, and the curing time is 20 minutes to ensure complete cross-linking of the resin.

[0122] (7) Final testing and packaging:

[0123] The cured light-cured film is tested for quality to ensure that the film layer is uniform, bubble-free, and crack-free. After passing the test, the light-cured film is packaged and stored.

[0124] Performance test:

[0125] Film thickness test: The thickness of the light-cured film is measured using a digital thickness gauge, and three positions are randomly selected for testing. The film thickness at each position is recorded, with the film thickness at the three positions being 12.5 μm, 13.1 μm, and 12.7 μm, respectively. The film thickness at each position is within the range of 12-15 μm, meeting the design requirements.

[0126] Surface contact angle test: The contact angle of the light-cured film surface is measured using a contact angle measuring instrument for super-hydrophobicity test. The measured contact angle is 158°, indicating that the film layer has very good super-hydrophobic properties and can effectively prevent water and dirt.

[0127] Mechanical strength and flexibility test: The light-cured film is tested for tensile strength and elongation at break using a tensile testing machine. The test results are as follows:

[0128] 1. Tensile strength: 50 MPa;

[0129] 2. Elongation at break: 10%.

[0130] The results show that the film layer has good mechanical strength and flexibility, and can effectively resist external force impact.

[0131] Thermal stability test: The thermal stability of the photocured film was tested using a thermal gravimetric analysis (TGA) instrument, and the results showed that the film layer was stable below 250℃ with a weight loss of less than 5%; this result indicates that the film layer has good thermal stability.

[0132] Curing efficiency test: The ultraviolet light absorption and crosslinking during the curing process were monitored by an ultraviolet curing test instrument, and the results showed that the curing efficiency was 96%, indicating that the crosslinking reaction of the resin under ultraviolet light irradiation was very efficient.

[0133] The data sheet is as follows:

[0134]

[0135]

[0136] The experimental results show that:

[0137] Film thickness: meets the design requirements, uniform and bubble-free, thickness is 12-15μm; superhydrophobicity: contact angle reaches 158°, with excellent water and stain resistance; mechanical strength and flexibility: tensile strength is 50MPa, elongation at break is 10%, with good flexibility; thermal stability: stable below 250℃ with a weight loss of less than 5%; curing efficiency: curing efficiency reaches 96% under ultraviolet light irradiation, resin crosslinking is complete, and the film layer is stable.

[0138] The photocured film prepared in this embodiment has excellent mechanical properties, superhydrophobicity, corrosion resistance and thermal stability, and can be widely used as a surface coating for special-shaped composite materials, improving the durability and functionality of composite materials in extreme environments.

[0139] Example 3

[0140] The embodiments of the present application provide a photocured film for special-shaped composite materials and a preparation method thereof, as follows:

[0141] Raw material preparation:

[0142] Prepare raw materials in the following weight percentages:

[0143] Photocured resin (polyurethane resin): 74%;

[0144] Tackifier (epoxy acrylate): 5%;

[0145] Silica aerogel: 1%;

[0146] Flexible toughener (silane-based acrylate): 2%;

[0147] UV light catalyst (photoinitiator BAPO): 0.5%;

[0148] Viscosity regulator (polyvinyl pyrrolidone, PVP): 1%;

[0149] Nano-silicon: 3%;

[0150] Liquid crystal polymer (liquid crystal polyamide, LCPs): 5%;

[0151] Super-hydrophobic material (nano-silicon dioxide coating): 3%;

[0152] Light-heat conversion material (graphene): 0.5%;

[0153] Reactive solvent (butadiene): 2%;

[0154] Organic-inorganic composite (silicone): 3%.

[0155] The preparation steps of the light-cured film for the special-shaped composite material are as follows:

[0156] (1) Preparation of reaction solution:

[0157] Add the reactive solvent butadiene into the reaction container and heat to 50°C. Then add the light-cured resin (silane-based acrylate) and stir until completely dissolved to form a uniform resin solution.

[0158] (2) Dispersion and homogenization:

[0159] Slowly add the viscosity regulator (polyvinyl pyrrolidone) to the resin solution, then add the silica aerogel, nano-silicon, liquid crystal polymer (liquid crystal polyamide), and organic-inorganic composite (silicone). Use ultrasonic or high-speed stirring equipment to disperse the mixture, ensuring that each component is fully and uniformly dispersed to obtain a dispersion liquid.

[0160] (3) Add toughener and catalyst:

[0161] Add the flexible toughener (silane-based acrylate) to the dispersion liquid and continue to stir until uniform. Then add the UV light catalyst (photoinitiator BAPO) and light-heat conversion material (graphene), and stir again until uniform to obtain the final light-cured film coating.

[0162] (4) Degassing and coating:

[0163] The light-cured film coating is placed in a vacuum degassing device and degassed for 10 minutes to remove bubbles. Then the degassed coating is uniformly applied to the profiled composite material surface which has been pre-coated with an adhesion promoter. The adhesion promoter is applied to the composite material surface using an epoxy acrylate, with an application amount of 35 g / m 2 , and a drying temperature of 40°C for 3 minutes after application.

[0164] (5) UV curing:

[0165] The coated composite material is sent to a UV curing device for UV irradiation in the wavelength range of 200-400 nm, with a UV power of 200 mJ / cm 2 and an irradiation time of 5 minutes. The initiator in the light-cured resin is activated under UV irradiation, promoting cross-linking reaction, and the film layer is cured in a short time.

[0166] (6) Spraying super-hydrophobic material:

[0167] A nano-silica coating is uniformly sprayed on the surface of the cured light-cured film using a spray gun, with a spraying amount of 0.5 g / m 2 . Then the sprayed composite material is sent to a temperature control box and heated to 60°C, with a curing time of 60 minutes to ensure complete cross-linking of the resin.

[0168] (7) Final testing and packaging:

[0169] The cured light-cured film is tested for quality to ensure uniformity, no bubbles, and no cracks. After passing the test, the light-cured film is packaged and stored.

[0170] Performance test:

[0171] Film thickness test: The thickness of the light-cured film is measured using a digital thickness gauge, and three random positions are tested to record the film thickness at each position. The film thickness at the three positions is 14.1 μm, 13.9 μm and 13.8 μm respectively, and the film thickness at each position is within the range of 12-15 μm, meeting the design requirements.

[0172] Surface contact angle test: The contact angle of the light-cured film surface is tested using a contact angle measuring instrument for super-hydrophobicity test. The measured contact angle is 162°, indicating that the film layer has very good super-hydrophobicity, effectively preventing water and dirt.

[0173] Mechanical strength and flexibility test: The light-cured film is tested for tensile strength and elongation at break using a tensile testing machine. The test results are as follows:

[0174] 1. Tensile strength: 48 MPa;

[0175] 2. Elongation at break: 9%.

[0176] The results show that the film layer has good mechanical strength and flexibility, and can effectively resist external force impact.

[0177] Thermal stability test: The thermal stability of the photocured film was tested using a thermal gravimetric analysis (TGA) instrument, and the results showed that the film layer was stable below 250°C with a weight loss of less than 5%; this result indicates that the film layer has good thermal stability.

[0178] Curing efficiency test: The ultraviolet light absorption and crosslinking during the curing process were monitored by an ultraviolet curing test instrument, and the results showed that the curing efficiency was 97%, indicating that the crosslinking reaction of the resin under ultraviolet light irradiation was very efficient.

[0179] The data sheet is as follows:

[0180]

[0181] The experimental results show that:

[0182] Film thickness: meets the design requirements, uniform and bubble-free, thickness is 12-15 μm; superhydrophobicity: contact angle reaches 162°, with excellent water and stain resistance; mechanical strength and flexibility: tensile strength is 48 MPa, elongation at break is 9%, with good flexibility; thermal stability: stable below 250°C with a weight loss of less than 5%; curing efficiency: curing efficiency reaches 97% under ultraviolet light irradiation, resin crosslinking is complete, and the film layer is stable.

[0183] The photocured film prepared in this embodiment has excellent mechanical properties, superhydrophobicity, corrosion resistance, and thermal stability, and can be widely used as a surface coating for special-shaped composite materials, improving the durability and functionality of composite materials in extreme environments.

[0184] Example 4

[0185] The embodiments of the present application provide a photocured film for special-shaped composite materials and a preparation method thereof, as follows:

[0186] Raw material preparation:

[0187] Prepare raw materials in the following weight percentages:

[0188] Photocured resin (acrylic resin): 68%;

[0189] Tackifier (acrylic octyl ester): 3%;

[0190] Silica aerogel: 2%;

[0191] Flexible toughening agent (polyacrylate toughening agent): 4%;

[0192] UV light catalyst (photoinitiator BAPO): 2%;

[0193] Viscosity modifier (hydroxyethyl cellulose, HEC): 1%;

[0194] Nano-silicon: 2%;

[0195] Liquid crystal polymer (polyethylene terephthalate): 7%;

[0196] Super-hydrophobic material (fluorosilane trifluorochloroalkyl silane): 5%;

[0197] Light-heat conversion material (graphene): 1%;

[0198] Reactive solvent (butadiene): 3%;

[0199] Organic-inorganic composite (siloxane): 2%.

[0200] The preparation steps of the light-cured film for the profiled composite material are as follows:

[0201] (1) Preparation of the reaction solution:

[0202] Add the reactive solvent butadiene to the reaction vessel and heat to 55°C. Then add the light-cured resin (polyacrylate toughener) and stir until completely dissolved to form a uniform resin solution.

[0203] (2) Dispersion and homogenization:

[0204] Slowly add the viscosity modifier (polyvinyl pyrrolidone) to the resin solution, then add the silica aerogel, nano-silicon, liquid crystal polymer (liquid crystal polyamide), and organic-inorganic composite (siloxane). Use ultrasonic or high-speed stirring equipment to disperse the mixture, ensuring that each component is evenly dispersed, obtaining a dispersion liquid.

[0205] (3) Addition of toughener and catalyst:

[0206] Add the flexible toughener (polyacrylate toughener) to the dispersion liquid and continue stirring until uniform. Then add the UV light catalyst (photoinitiator BAPO) and light-heat conversion material (graphene), and stir again until uniform, obtaining the final light-cured film coating.

[0207] (4) Degassing and coating:

[0208] Place the light-cured film coating in a vacuum degassing device and degas for 15 minutes to remove bubbles. Then evenly coat the degassed coating on the profiled composite material surface previously coated with adhesion promoter. The adhesion promoter is octyl acrylate, which is coated on the composite material surface at a coating amount of 45 g / m 2, the drying temperature after coating is 50℃, and the drying time is 2 minutes.

[0209] (5) UV curing:

[0210] The coated composite material is sent to a UV curing device for UV irradiation in the wavelength range of 200-400 nm, with a UV power of 250 mJ / cm 2 , and the irradiation time is 3 minutes. The initiator in the photocured resin is activated under UV irradiation, promoting crosslinking reaction, and the film layer is cured in a short time.

[0211] (6) Spraying super-hydrophobic material:

[0212] Uniformly spray fluorosilane trifluorochloroalkylsilane on the surface of the cured photocured film using a spray gun, with a spraying amount of 4 g / m 2 . Then, the sprayed composite material is sent to a temperature control box and heated to 80℃, and the curing time is 40 minutes to ensure complete crosslinking of the resin.

[0213] (7) Final detection and packaging:

[0214] The cured photocured film is subjected to quality detection to ensure that the film layer is uniform, bubble-free and crack-free. After detection, the photocured film is packaged and stored.

[0215] Performance test:

[0216] Film thickness test: The thickness of the photocured film is measured using a digital thickness gauge, and three positions are randomly selected for testing. The film thickness at each position is recorded, and the film thickness at the three positions is 13.8 μm, 13.5 μm and 13.6 μm, respectively. The film thickness at each position is within the range of 12-15 μm, meeting the design requirements.

[0217] Surface contact angle test: The contact angle of the photocured film surface is measured using a contact angle measuring instrument for super-hydrophobicity test. The measured contact angle is 160°, indicating that the film layer has very good super-hydrophobicity, effectively preventing water and dirt.

[0218] Mechanical strength and flexibility test: The photocured film is subjected to tensile test using a tensile testing machine to test the tensile strength and elongation at break of the film layer. The test results are as follows:

[0219] 1. Tensile strength: 50 MPa;

[0220] 2. Elongation at break: 10%.

[0221] The results show that the film layer has good mechanical strength and flexibility, and can effectively resist external force impact.

[0222] Thermal stability test: The thermal stability of the photocured film was tested using a thermal gravimetric analysis (TGA) instrument, and the results showed that the film layer was stable below 250°C with a weight loss of less than 5%; this result indicated that the film layer had good thermal stability.

[0223] Curing efficiency test: The ultraviolet light absorption and cross-linking during the curing process were monitored by an ultraviolet light curing test instrument, and the results showed that the curing efficiency was 98%, indicating that the cross-linking reaction of the resin under ultraviolet light irradiation was very efficient.

[0224] The data table is as follows:

[0225]

[0226] The experimental results showed that:

[0227] Film thickness: The thickness of the film layer was uniform and free of bubbles, with a thickness of 12-15 μm; superhydrophobicity: the contact angle reached 160°, with excellent water and stain resistance; mechanical strength and flexibility: the tensile strength was 50 MPa, the elongation at break was 10%, and the film had good flexibility; thermal stability: stable below 250°C with a weight loss of less than 5%; curing efficiency: the curing efficiency under ultraviolet light irradiation reached 98%, the resin was completely cross-linked, and the film layer was stable.

[0228] The photocured film prepared in this embodiment has excellent mechanical properties, superhydrophobicity, corrosion resistance, and thermal stability, and can be widely used as a surface coating for complex composite materials, improving the durability and functionality of the composite materials in extreme environments.

[0229] In summary, through the above four examples, it can be clearly seen that the photocured film for complex composite materials of the present application, by adding superhydrophobic materials, light-heat conversion materials, nano-silicon, liquid crystal polymers (LCP), etc., significantly improves the surface functionality of the composite materials. The photocured film not only has superhydrophobicity, effectively resisting the adhesion of water droplets and stains, maintaining the cleanliness of the composite materials, but also enhances the ultraviolet resistance of the composite materials, prolonging their service life. By using liquid crystal polymers (LCP) and organic-inorganic composite materials, the photocured film not only has good flexibility and wear resistance, but also exhibits excellent thermal stability and corrosion resistance, maintaining long-term durability in harsh environments.

[0230] It is important to note that the construction and arrangement of the application shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review the present disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Thus, the foregoing description is by way of example only, and is not intended to be limiting. The application is limited only as defined in the following claims and equivalents thereto. The sequence of any process or method steps, or the order in which they are carried out, can be altered or re-ordered without departing from the scope of the application. Any "articles of manufacture" or "manufacturing" as described herein are intended to encompass structures constructed of a multitude of different physical elements or components. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and also cover structures yet to be invented which perform the recited function but operate in a different manner. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the application as expressed in the appended claims.

[0231] Also, to provide a concise description of the exemplary embodiments, not all features of an actual implementation can be described (that is, not all implementations can include all of the features described or optional implementations can include only a subset of the features described).

[0232] It should be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions can be made. Such development efforts might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

[0233] It should be noted that the above-mentioned embodiments are only used to illustrate the technical solutions of the present application but not to limit the present application, and although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or equivalent replaced without departing from the spirit and scope of the present application, and they should be covered in the scope of claims of the present application.

Claims

1. A light-cured film for a profiled composite material, characterized in that, The light-cured film for the special-shaped composite material comprises the following components by weight percentage: Light-cured resin 60%-85%; Tackifier 1%-5%; Silica aerogel 1%-3%; Flexible toughening agent 2%-5%; Ultraviolet light catalyst 0.5%-2%; Viscosity regulator 1%-2%; Nano silicon 1%-3%; Liquid crystal polymer 5%-8%; Super-hydrophobic material 1%-3%; Photo-thermal conversion material 0.5%-1%; Reactive solvent 2%-5%; Organic-inorganic composite material 1%-3%; The viscosity of the light-cured resin is in the range of 100-1000 mPa·s, which is used to form a uniform film layer during coating and curing, the ultraviolet light wavelength for curing the light-cured resin is between 200-400 nm, and the curing time is 1-5 minutes; the light-cured resin is epoxy resin, acrylic resin or polyurethane resin; the liquid crystal polymer is polyethylene terephthalate or liquid crystal polyamide; the super-hydrophobic material is fluororesin coating, fluorosilane trifluorochloroalkyl silane or nano-silica coating; the photo-thermal conversion material is graphene; the reactive solvent is butadiene; and the organic-inorganic composite material is siloxane. The preparation method of the light-cured film for the special-shaped composite material comprises the following steps: Prepare raw materials by weight percentage, add the reactive solvent into the reaction container and heat to 50-60℃, and then add the light-cured resin into the reactive solvent and stir until completely dissolved; Slowly add the viscosity regulator into the reaction container, and then add the silica aerogel, nano silicon, liquid crystal polymer and organic-inorganic composite material into the reaction container, and disperse by ultrasonic wave or high-speed stirring to obtain a dispersion liquid; After adding the flexible toughening agent into the dispersion liquid and continuously stirring until uniform, add the ultraviolet light catalyst and photo-thermal conversion material, and stir until uniform to obtain a light-cured film coating; Put the light-cured film coating into a vacuum degassing device to remove bubbles by degassing, and then uniformly coat the degassed light-cured film coating on the surface of the special-shaped composite material coated with the tackifier; Put the coated composite material into an ultraviolet light curing device for curing by irradiation with ultraviolet light; After curing treatment, use a spray gun to uniformly spray the super-hydrophobic material on the surface of the cured light-cured film, heat in a temperature control box until the resin is completely cross-linked, and then perform quality detection on the cured light-cured film, package and store the light-cured film after completion of the detection.

2. A light-cured film for a profiled composite material according to claim 1, characterized in that, The tackifier is butyl acrylate, octyl acrylate or epoxy acrylate, which is used to coat on the surface of the special-shaped composite material to form a viscosity-adjustable coating.

3. A light-cured film for a profiled composite material according to claim 1, characterized in that, The flexible toughening agent is polyurethane acrylate, polyurethane ether, silane-based acrylate or polyacrylate toughening agent; the ultraviolet light catalyst is benzoyl ethylene, phenyl benzophenone or a photoinitiator BAPO; and the viscosity regulator is hydroxyethyl cellulose or polyvinyl pyrrolidone.

4. A process for the production of a lightfast film for profiled composites according to any one of claims 1 to 3, characterized in that The preparation method of the light-cured film for the special-shaped composite material comprises the following steps: Prepare raw materials by weight percentage, add the reactive solvent into the reaction container and heat to 50-60℃, and then add the light-cured resin into the reactive solvent and stir until completely dissolved; The viscosity modifier is slowly added to the reaction container, and the silica aerogel, nano-silicon, liquid crystal polymer and organic-inorganic composite material are added to the reaction container and dispersed by ultrasonic or high-speed stirring to obtain a dispersion liquid; After adding the flexible toughening agent to the dispersion liquid and continuing to stir until uniform, the ultraviolet light catalyst and the light-heat conversion material are added and stirred uniformly to obtain a photocured film coating; The photocured film coating is placed in a vacuum degassing device to remove bubbles by degassing, and the degassed photocured film coating is uniformly coated on the surface of the profiled composite material coated with the adhesion promoter; The coated composite material is sent into a ultraviolet light curing device for curing by ultraviolet light irradiation; After curing treatment, the super-hydrophobic material is uniformly sprayed on the surface of the cured photocured film using a spray gun, and the cured photocured film is heated to complete crosslinking of the resin in a temperature control box. The cured photocured film is subjected to quality detection, packaged and stored after detection.

5. The method of claim 4, wherein the light-cured film is prepared by the steps of: The photocured film coating is placed in a vacuum degassing device and degassed for 10-15 minutes.

6. The method of claim 5, wherein the light-cured film is prepared by the steps of: When curing by ultraviolet light irradiation, the wavelength range of the ultraviolet light is 200-400 nm, the ultraviolet light power is 200-300 mJ / cm², and the curing time is 1-5 minutes.

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