Colorful high-strength film for building decoration and preparation method thereof

Abstract

This application relates to the field of membrane materials, and in particular to a colored high-strength membrane for architectural decoration and its preparation method. The high-strength membrane comprises a base fabric layer and a colored surface layer. The colored surface layer, by weight, comprises the following raw materials: 35-45 parts PVDF fluorocarbon resin, 4-10 parts colored pigment, 6-12 parts functional resin, 4-8 parts reinforcing agent, 2-5 parts composite filler, 0.8-1.5 parts dispersant, 0.3-0.8 parts leveling agent, 0.2-0.5 parts defoamer, 0.3-0.5 parts UV stabilizer, 2-4 parts plasticizer, and 25-40 parts solvent. The colored high-strength membrane obtained by this application possesses advantages such as high strength and durability, rich and long-lasting color stability, and excellent weather resistance, fully meeting the urgent demand for high-quality membrane structure materials in modern green buildings and urban renewal.

Description

Technical Field

[0001] This application relates to the field of membrane materials, and in particular to a colored high-strength membrane for architectural decoration and its preparation method. Background Technology

[0002] With the development of modern architecture towards large spans, lightweighting, and landscaping, membrane structure materials have been widely used in stadiums, transportation hubs, commercial complexes, and urban landscape facilities. Currently, common architectural membrane materials on the market mainly include polyvinyl chloride (PVC) coated polyester fiber membranes, polytetrafluoroethylene (PTFE) coated fiberglass membranes, and ethylene-tetrafluoroethylene (ETF) copolymer films. Among these, PVC membrane materials occupy a large market share due to their good flexibility, ease of processing, and low cost. However, their surface is prone to dust accumulation, and they have poor weather resistance and self-cleaning properties. Long-term exposure to ultraviolet light can cause yellowing and chalking, leading to color fading. PTFE membrane materials have excellent chemical corrosion resistance, aging resistance, and self-cleaning properties, with a service life of over 25 years. However, due to their grayish-white color, it is difficult to achieve vibrant and rich decorative effects, usually requiring additional coating or dyeing processes to obtain color. These additional layers often have insufficient adhesion and weather resistance. While ETF copolymer films have excellent light transmittance and can be made in various colors, their mechanical strength is relatively low, making them unsuitable for high-tensile load-bearing structures, and they are also expensive.

[0003] To address the demand for colored architectural membrane materials, existing technologies have attempted to imbue these materials with decorative qualities through surface printing or coating. For example, applying acrylic or fluorocarbon topcoats to PVC or PTFE substrates can yield basic colors such as red, blue, and yellow. However, these colored coatings face significant durability issues in practical applications. For instance, under prolonged exposure to sunlight, rain, and fluctuating temperatures, the interfacial bonding between the coating and the base fabric gradually weakens, leading to peeling and flaking. Simultaneously, organic pigments or dyes are prone to molecular chain breakage under ultraviolet radiation, resulting in fading and darkening, causing significant deterioration of the building's appearance after only a few years of use. Furthermore, large-span membrane structures must withstand repeated wind vibrations, snow loads, and prestressing during use. The fatigue resistance and dimensional stability of colored membrane materials under sustained high stress are still unsatisfactory, with some products exhibiting delamination between the base fabric and coating or localized stress cracking, affecting structural safety.

[0004] In summary, existing technologies generally suffer from the problem of limited functionality. Colored films often sacrifice light transmittance, environmental friendliness, or self-cleaning ability, making it difficult to achieve a multi-functional integrated solution that combines high strength, long-lasting color, stain resistance, self-cleaning, and a certain degree of light transmittance. Summary of the Invention

[0005] Therefore, in order to solve the technical problems of existing colored membrane structure materials for architectural decoration, such as long-term UV resistance, anti-pollution and self-cleaning performance, structural stability under high tension, fatigue resistance, and the firmness between the base fabric and the colored surface layer, this application provides a colored high-strength membrane material that is both high-strength and durable, rich in color and long-term stable, and has excellent weather resistance, so as to meet the urgent needs of modern green buildings and urban renewal for high-quality membrane structure materials.

[0006] To achieve the above objectives, this application provides the following technical solution: The first aspect of this application provides a colored high-strength film for architectural decoration, which includes a base fabric layer and a colored surface layer.

[0007] Preferably, the base fabric layer is glass fiber cloth.

[0008] Preferably, the thickness of the glass fiber cloth is 0.15~0.25mm.

[0009] Preferably, the thickness of the glass fiber cloth is 0.15~0.2mm.

[0010] Preferably, the weight of the glass fiber cloth is 150~300 g / m².

[0011] Preferably, the weight of the glass fiber cloth is 180~240 g / m².

[0012] Preferably, the colored surface layer, by weight, comprises the following raw materials: 35-45 parts PVDF fluorocarbon resin, 4-10 parts colored pigment, 6-12 parts functional resin, 4-8 parts reinforcing agent, 2-5 parts composite filler, 0.8-1.5 parts dispersant, 0.3-0.8 parts leveling agent, 0.2-0.5 parts defoamer, 0.3-0.5 parts UV stabilizer, 2-4 parts plasticizer, and 25-40 parts solvent.

[0013] Preferably, the PVDF fluorocarbon resin is Kynar 500 FSF, manufactured by Arkema, France.

[0014] Preferably, the colored pigment is at least one of cobalt chromium blue, iron oxide red, iron oxide yellow, titanium nickel yellow, and titanium chromium brown.

[0015] Preferably, the mass ratio of the PVDF fluorocarbon resin, functional resin and reinforcing agent is (3.8~4.2):(0.8~1.1):(0.5~0.8).

[0016] Preferably, the mass ratio of the PVDF fluorocarbon resin, functional resin and reinforcing agent is (3.8~4):(0.8~1):(0.6~0.7).

[0017] Preferably, the functional resin is a combination of an acrylic-compatible resin and a thermosetting acrylic resin.

[0018] Preferably, the mass ratio of the acrylic compatible resin to the thermosetting acrylic resin is (6~8):(2~4).

[0019] Preferably, the mass ratio of the acrylic compatible resin to the thermosetting acrylic resin is (7~8):(2~3).

[0020] Preferably, the weight-average molecular weight of the acrylic-compatible resin is 70,000 to 120,000 Da.

[0021] Preferably, the weight-average molecular weight of the acrylic-compatible resin is 80,000 to 100,000 Da.

[0022] Preferably, the acid value of the acrylic-compatible resin is 1.8~2.6 mgKOH / g.

[0023] Preferably, the acid value of the acrylic-compatible resin is 2~2.3 mgKOH / g.

[0024] Preferably, the acrylic compatible resin is Acoma-S5440, manufactured by Acoma Chemical Co., Ltd. in Xiamen, China.

[0025] Preferably, the acid value of the thermosetting acrylic resin is 4~8 mg KOH / g.

[0026] Preferably, the acid value of the thermosetting acrylic resin is 5~7 mg KOH / g.

[0027] Preferably, the viscosity of the thermosetting acrylic resin is 1000~3000 cps / 25℃.

[0028] Preferably, the viscosity of the thermosetting acrylic resin is 1500~2500 cps / 25℃.

[0029] Preferably, the thermosetting acrylic resin is RS-360A, manufactured by Shenzhen Jinfengyuan Polymer Materials Co., Ltd., China.

[0030] In this application, the acrylic resin and PVDF form a uniform physical entanglement network at the molecular chain level, significantly improving the phase stability of the system and providing a good wetting and dispersion environment for the pigments. During the curing process, the active hydroxyl groups in the thermosetting hydroxyl acrylic resin interact with the unstable fluorine atoms of the PVDF molecular chain, gradually forming hydrogen bonds and producing localized chemical crosslinks. Through this complementary effect, a composite network structure with moderate rigidity is established within the coating, effectively improving the overall mechanical properties and resistance to media, and providing a solid foundation for comprehensive performance.

[0031] Preferably, the reinforcing agent is a combination of hydroxyl-terminated hyperbranched polyester and hydrogenated castor oil.

[0032] Preferably, the mass ratio of the terminal hydroxyl hyperbranched polyester to hydrogenated castor oil is (2~4):(0.7~1.2).

[0033] Preferably, the mass ratio of the terminal hydroxyl hyperbranched polyester to hydrogenated castor oil is (3~3.5):(0.9~1.2).

[0034] Preferably, the hydroxyl-terminated hyperbranched polyester has a hydroxyl value of 500~700 mgKOH / g.

[0035] Preferably, the hydroxyl-terminated hyperbranched polyester has a hydroxyl value of 550~600 mgKOH / g.

[0036] Preferably, the hydroxyl-terminated hyperbranched polyester is HyPer H103, manufactured by Wuhan Hyperbranched Resin Technology Co., Ltd., China.

[0037] By incorporating hydroxyl-terminated hyperbranched polyester, its highly branched molecular structure and densely packed terminal hydroxyl groups form hydrogen bonds with the PVDF matrix during coating curing, providing internal bonding strength and improving the overall density and cohesive strength of the coating. Hydrogenated castor oil, as a rheology modifier, inhibits coating sagging during the coating stage and absorbs and disperses local stress through its long-chain structure in the later stages of curing, preventing excessive network rigidity. Together, these factors enable the coating to achieve high strength while maintaining good impact toughness and film uniformity.

[0038] Preferably, the composite filler is a combination of zirconium phosphate and cellulose nanocrystals.

[0039] Preferably, the mass ratio of zirconium phosphate to cellulose nanocrystals is (4~6):(0.8~1.5).

[0040] Preferably, the mass ratio of zirconium phosphate to cellulose nanocrystals is (4~5):(1~1.2).

[0041] Preferably, the zirconium phosphate has an average particle size of 2~3 μm.

[0042] Preferably, the cellulose nanocrystals have a fiber diameter of 5-15 nm and a length of 200-400 nm.

[0043] Preferably, the dispersant is BYK-163.

[0044] Preferably, the leveling agent is at least one of BYK-358N, BYK-361N, and polyacrylate.

[0045] Preferably, the leveling agent is BYK-358N or BYK-361N.

[0046] Preferably, the defoamer is BYK-1790 or BYK-054.

[0047] Preferably, the UV stabilizer is at least one of Tinuvin 292, Tinuvin 770 DF, Tinuvin 123 and Chimassorb 944.

[0048] Preferably, the UV stabilizer is Tinuvin 292 or Tinuvin 770 DF.

[0049] Preferably, the UV stabilizer is Tinuvin 292.

[0050] Preferably, the plasticizer is at least one selected from triethyl citrate, acetylated tributyl citrate, dipropylene glycol dibenzoate, and diethylene glycol dibenzoate.

[0051] Preferably, the plasticizer is triethyl citrate or acetylated tributyl citrate.

[0052] Preferably, the plasticizer is triethyl citrate.

[0053] Preferably, the solvent is a combination of N,N-dimethylformamide and methyl ethyl ketone.

[0054] Preferably, the mass ratio of N,N-dimethylformamide to methyl ethyl ketone is (1~2.5):1.

[0055] Preferably, the mass ratio of N,N-dimethylformamide to methyl ethyl ketone is (1.5~2):1.

[0056] The second aspect of this application provides a method for preparing the above-mentioned colored high-strength film for architectural decoration, specifically including the following steps: S1: After ultrasonic cleaning, the glass fiber cloth is dried, then immersed in a 0.5~1wt% KH-550 ethanol solution, and then dried; S2: A solvent is added to a reaction vessel and heated, and a functional resin is added and stirred, then a reinforcing agent and a composite filler are added. After each addition, the mixture is stirred evenly to obtain a pre-dispersed slurry. The remaining raw materials are then added to the pre-dispersed slurry in sequence, and the mixture is stirred each time until the fineness is ≤20μm. After completion, the mixture is filtered through a sieve to remove bubbles; S3: The glass fiber cloth obtained in S1 is coated using a gravure roller, dried, and cured at 180~200℃ for 8~12min. After cooling to room temperature, the cloth is rolled up, allowed to stand, and then cut to obtain the final product.

[0057] Preferably, the preparation method of the colored high-strength film for architectural decoration specifically includes the following steps: S1: Ultrasonic cleaning of glass fiber cloth at 40~50℃ for 15~20 min, followed by drying at 100~110℃, then immersion in a 0.5~1wt% KH-550 ethanol solution for 5~10 min, followed by drying at 80~90℃ for 12~15 min; S2: Adding solvent to a reaction vessel and heating to 40~45℃, adding functional resin, stirring at 50~60℃ for 45~60 min, then sequentially adding reinforcing agent and composite filler, each addition followed by a 600~ Stir at 800 rpm for 20-25 min to obtain a pre-dispersed slurry. Then add the remaining raw materials to the pre-dispersed slurry in sequence, stirring at 600-800 rpm each time until the fineness is ≤20μm. After completion, filter through a 200-300 mesh sieve and let stand to defoam for 30-40 min. S3: Coat the glass fiber cloth obtained in S1 with a gravure roller at a coating speed of 8-12 m / min. The wet film thickness is 40-60μm on one side. After completion, dry and cure at 180-200℃ for 8-12 min. Cool to room temperature and roll up. Let stand at 60-70℃ for 24-48 h and cut to obtain the final product.

[0058] The beneficial effects and application advantages of this application are as follows: 1. The colored high-strength membrane for architectural decoration produced in this application achieves a high-strength interfacial bond between the base fabric and the colored coating. The coating internally constructs a dense physical barrier and reinforcing structure, endowing the material with excellent tensile strength and fatigue resistance. Simultaneously, the use of highly weather-resistant cold pigments and self-cleaning surface technology ensures that the membrane maintains vibrant and stable colors during long-term outdoor use, and possesses good anti-fouling and self-cleaning capabilities. It exhibits advantages such as overall lightweight yet high strength, durability, and aesthetic appeal, meeting the engineering requirements for high-performance decorative membranes in large buildings such as stadiums and transportation hubs.

[0059] 2. In this application, the acrylic resin and PVDF form a uniform physical entanglement network at the molecular chain level, significantly improving the phase stability of the system and providing a good wetting and dispersion environment for the pigments. The active hydroxyl groups in the thermosetting hydroxyl acrylic resin interact with the unstable fluorine atoms of the PVDF molecular chain during curing, gradually forming hydrogen bonds and producing localized chemical crosslinks, improving the overall mechanical properties and media resistance, and providing a good foundation for comprehensive performance.

[0060] 3. This application incorporates hydroxyl-terminated hyperbranched polyester, which, with its highly branched molecular structure and dense terminal hydroxyl groups, forms hydrogen bonds with the PVDF matrix during the coating curing process, providing internal bonding strength and improving the overall density and cohesive strength of the coating. Meanwhile, hydrogenated castor oil absorbs and disperses local stress, preventing the network from becoming excessively brittle. Together, these factors enable the coating to achieve high strength while maintaining good impact toughness and film uniformity. Detailed Implementation

[0061] In the following specific embodiments, unless otherwise specified, the sources / preparation methods of some raw materials are as follows: The fiberglass cloth has a thickness of 0.2mm and a weight of 220g / m². It is manufactured by Haining Jiete Fiberglass Cloth Industry Co., Ltd.

[0062] Kynar 500 FSF PVDF fluorocarbon resin, Arkema, France.

[0063] Acoma-S5440, an acrylic-compatible resin, is manufactured by Acoma Chemical Co., Ltd. in Xiamen, China.

[0064] Thermosetting acrylic resin RS-360A, manufactured by Shenzhen Jinfengyuan Polymer Materials Co., Ltd., China.

[0065] The hydroxyl-terminated hyperbranched polyester is specifically HyPer H103, manufactured by Wuhan Hyperbranched Resin Technology Co., Ltd., China.

[0066] Example 1 A colored high-strength membrane for architectural decoration, comprising a base fabric layer and a colored surface layer.

[0067] The base fabric layer is made of fiberglass cloth with a thickness of 0.2mm and a weight of 220g / m².

[0068] The colored surface layer, by weight, comprises the following raw materials: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8.6 parts functional resin, 6.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0069] The PVDF fluorocarbon resin is Kynar 500 FSF.

[0070] The colored pigment is cobalt chromium blue.

[0071] The functional resin is a combination of acrylic-compatible resin and thermosetting acrylic resin in a mass ratio of 7:3.

[0072] The acrylic-compatible resin Acoma-S5440 has a weight-average molecular weight of 100,000 Da and an acid value of 2 mg KOH / g.

[0073] The thermosetting acrylic resin, RS-360A, has an acid value of 5.8 mg KOH / g and a viscosity of 2000 cps / 25℃.

[0074] The reinforcing agent is a combination of hydroxyl-terminated hyperbranched polyester and hydrogenated castor oil in a mass ratio of 3.3:1.2.

[0075] Hydroxyl-terminated hyperbranched polyester HyPer H103 has a hydroxyl value of 560 mg KOH / g.

[0076] The composite filler is a combination of zirconium phosphate and cellulose nanocrystals in a mass ratio of 4.8:1.2; the average particle size of zirconium phosphate is 2.2 μm; the fiber diameter of the cellulose nanocrystals is 12 nm and the length is 300 nm.

[0077] The dispersant is BYK-163; the leveling agent is BYK-358N; the defoamer is BYK-1790; the UV stabilizer is Tinuvin 292; and the plasticizer is triethyl citrate.

[0078] The solvent is a combination of N,N-dimethylformamide and methyl ethyl ketone in a mass ratio of 2:1.

[0079] A method for preparing a colored high-strength film for architectural decoration includes the following steps: S1: Ultrasonic cleaning of glass fiber cloth at 50℃ for 20 min, followed by drying at 100℃, then immersion in 0.8wt% KH-550 ethanol solution for 10 min, followed by drying at 90℃ for 15 min; S2: Adding solvent to a reaction vessel and heating to 45℃, adding functional resin, stirring at 55℃ for 50 min, then sequentially adding reinforcing agent and composite filler, stirring at 800 rpm for 25 min after each addition to obtain a pre-dispersed slurry, then sequentially adding the remaining raw materials to the pre-dispersed slurry, stirring at 800 rpm for each addition until the fineness is ≤20μm, filtering through a 200-mesh sieve, and allowing to stand for defoaming for 40 min; S3: Coating the glass fiber cloth obtained in S1 using a gravure roller at a coating speed of 10 m / min, with a wet film thickness of 50 μm on one side, drying and curing at 190℃ for 10 min, cooling to room temperature and winding, standing at 65℃ for 30 h, and then cutting to obtain the final product.

[0080] Example 2 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 10.2 parts functional resin, 5.4 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0081] The above are the only differences between this embodiment and Embodiment 1; all other aspects are the same.

[0082] Example 3 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8 parts functional resin, 7.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0083] The above are the only differences between this embodiment and Embodiment 1; all other aspects are the same.

[0084] Comparative Example 1 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 2.2 parts functional resin, 11 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0085] The above are the only differences between this comparative example and Example 1; all other aspects are the same.

[0086] Comparative Example 2 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8.6 parts functional resin, 6.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0087] The functional resin is a combination of acrylic-compatible resin and thermosetting acrylic resin in a mass ratio of 9.5:0.5.

[0088] The above are the only differences between this comparative example and Example 1; all other aspects are the same.

[0089] Comparative Example 3 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8.6 parts functional resin, 6.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0090] The functional resin is a combination of acrylic-compatible resin and thermosetting acrylic resin in a mass ratio of 3.5:6.5.

[0091] The above are the only differences between this comparative example and Example 1; all other aspects are the same.

[0092] Comparative Example 4 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8.6 parts functional resin, 6.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0093] The reinforcing agent is a combination of hydroxyl-terminated hyperbranched polyester and hydrogenated castor oil in a mass ratio of 4.5:0.5.

[0094] The above are the only differences between this comparative example and Example 1; all other aspects are the same.

[0095] Comparative Example 5 A colored high-strength film for architectural decoration, with a colored surface layer, comprises the following raw materials by weight: 40 parts PVDF fluorocarbon resin, 5.2 parts colored pigment, 8.6 parts functional resin, 6.6 parts reinforcing agent, 3.4 parts composite filler, 1.1 parts dispersant, 0.6 parts leveling agent, 0.3 parts defoamer, 0.3 parts UV stabilizer, 2.9 parts plasticizer, and 30.5 parts solvent.

[0096] The reinforcing agent is a combination of hydroxyl-terminated hyperbranched polyester and hydrogenated castor oil in a mass ratio of 2:3.

[0097] The above are the only differences between this comparative example and Example 1; all other aspects are the same.

[0098] Performance testing 1. Peel strength: The high-strength films prepared in the examples and comparative examples were conditioned for 24 hours in a constant temperature and humidity environment of 20±2℃ and 65±4% relative humidity. Five samples with a width of 50 mm and a length of not less than 200 mm were cut from the finished film material along the warp and weft directions. Using a tensile testing machine with the clamp spacing set to 100 mm, the coating was separated from the base fabric in a 180° direction at a constant peel speed of 100 mm / min. The peel load curve of at least 150 mm length during the peeling process was continuously recorded. The average value of the middle section of the peel curve was taken as the peel strength, with the unit being N / cm. The results were the average of 5 tests and recorded in Table 1.

[0099] 2. Tensile strength and elongation at break: The test was conducted in accordance with GB / T 1040.5-2008, and the results were the average of 5 tests and recorded in Table 1.

[0100] 3. Aging resistance: The test references GB / T 16422.2-2022. After 3000h of aging, the color difference ΔE value is taken, and the result is the average of 5 tests, which is recorded in Table 1.

[0101] 4. Water contact angle: The surface was tested using the seat drop method. The test drop was 2 μL and the test time was 20 s. The water contact angle was taken as °. The result was the average of 5 tests and recorded in Table 1.

[0102] Table 1 Performance Test Results Example Peel strength (N / cm) Tensile strength (MPa) Elongation at break (%) Aging resistance (ΔE) Water contact angle (°) Example 1 5.97 88.6 36 1.84 123.6 Example 2 6.01 85.5 33 1.91 120.7 Example 3 5.88 87.3 35 2.20 122.3 Comparative Example 1 4.34 74.2 30 4.68 110.3 Comparative Example 2 4.77 70.6 27 6.14 108.9 Comparative Example 3 5.10 77.6 28 5.55 114.3 Comparative Example 4 4.96 78.2 31 5.69 98.6 Comparative Example 5 4.87 79.0 26 6.01 100.7 Analysis of Test Results: Examples 1-3, by employing the corresponding technical solutions defined in this application, significantly outperformed Comparative Examples 1-5 in terms of their respective functional test results. Examples 1-3, using the corresponding technical solutions defined in this application, significantly improved the phase stability of the system by forming a uniform physical entanglement network between acrylic resin and PVDF at the molecular chain level. This also provided a good wetting and dispersion environment for the pigments. Furthermore, the addition of terminal hydroxyl hyperbranched polyester, with its highly branched molecular structure and dense terminal hydroxyl groups, formed hydrogen bonds with the PVDF matrix during coating curing, providing internal bonding strength and improving the overall density and cohesive strength of the coating. Hydrogenated castor oil absorbed and dispersed local stress, preventing excessive network rigidity. All these factors combined resulted in a coating that achieved high strength while maintaining good impact toughness and film uniformity, thus achieving excellent overall performance. Comparative Examples 1-5, however, employed different technical solutions defined in this application, leading to a significant decrease in the technical effects of their respective raw materials, ultimately resulting in worse overall performance compared to Examples 1-3.

[0103] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A colored high-strength film for architectural decoration, characterized in that: It comprises a base fabric layer and a colored surface layer; the base fabric layer is fiberglass cloth; The colored surface layer, by weight, comprises the following raw materials: 35-45 parts PVDF fluorocarbon resin, 4-10 parts colored pigment, 6-12 parts functional resin, 4-8 parts reinforcing agent, 2-5 parts composite filler, 0.8-1.5 parts dispersant, 0.3-0.8 parts leveling agent, 0.2-0.5 parts defoamer, 0.3-0.5 parts UV stabilizer, 2-4 parts plasticizer, and 25-40 parts solvent; The functional resin is a combination of acrylic compatibility resin and thermosetting acrylic resin in a mass ratio of (6~8):(2~4). The reinforcing agent is a combination of hydroxyl-terminated hyperbranched polyester and hydrogenated castor oil in a mass ratio of (2~4):(0.7~1.2).

2. The colored high-strength film for architectural decoration as described in claim 1, characterized in that: The mass ratio of the PVDF fluorocarbon resin, functional resin and reinforcing agent is (3.8~4.2):(0.8~1.1):(0.5~0.8).

3. The colored high-strength film for architectural decoration as described in claim 2, characterized in that: The colored pigments are at least one of cobalt chromium blue, iron oxide red, iron oxide yellow, titanium nickel yellow, and titanium chromium brown.

4. The colored high-strength film for architectural decoration as described in claim 3, characterized in that: The acrylic-compatible resin has a weight-average molecular weight of 70,000 to 120,000 Da; the acrylic-compatible resin has an acid value of 1.8 to 2.6 mg KOH / g.

5. The colored high-strength film for architectural decoration as described in claim 4, characterized in that: The thermosetting acrylic resin has an acid value of 4~8 mg KOH / g and a viscosity of 1000~3000 cps / 25℃.

6. The colored high-strength film for architectural decoration as described in claim 5, characterized in that: The hydroxyl-terminated hyperbranched polyester has a hydroxyl value of 500~700 mgKOH / g.

7. The colored high-strength film for architectural decoration as described in claim 6, characterized in that: The composite filler is a combination of zirconium phosphate and cellulose nanocrystals in a mass ratio of (4~6):(0.8~1.5).

8. The colored high-strength film for architectural decoration as described in claim 7, characterized in that: The zirconium phosphate has an average particle size of 2-3 μm; the cellulose nanocrystals have a fiber diameter of 5-15 nm and a length of 200-400 nm.

9. The colored high-strength film for architectural decoration as described in claim 8, characterized in that: The plasticizer is at least one of triethyl citrate, acetylated tributyl citrate, dipropylene glycol dibenzoate, and diethylene glycol dibenzoate.

10. A method for preparing a colored high-strength film for architectural decoration according to any one of claims 1 to 9, characterized in that: Specifically, the following steps are included: S1: After ultrasonic cleaning, the fiberglass cloth is dried and then immersed in a 0.5~1wt% KH-550 ethanol solution, and then dried. S2: Add solvent to the reactor and heat it, then add functional resin and stir. Then add reinforcing agent and composite filler. Stir evenly after each addition to obtain a pre-dispersed slurry. Then add the remaining raw materials to the pre-dispersed slurry in sequence. Stir each time until the fineness is ≤20μm. After completion, filter with a sieve to remove bubbles. S3: Coat the glass fiber cloth obtained in S1 with a gravure roller. After completion, dry it and cure it at 180~200℃ for 8~12min. Cool it to room temperature, roll it up, let it stand, and then cut it to obtain the final product.