An easy-to-clean sunshade cloth

Abstract

The utility model discloses an easy-to-clean sunshade cloth relates to sunshade cloth technical field. The sunshade cloth includes sunshade cloth body, and the body includes polyester layer, and the polyester layer outside sets up first oil -repellent layer and second oil -repellent layer, and the oil -repellent layer adopts the nano silicon dioxide of surface modification and is made into with spraying. The both sides of sunshade cloth body set heat insulating layer, reflective layer and flame -retardant layer in proper order, and heat insulating layer adopts silicon base hydrophobic material, and reflective layer adopts aluminum foil film, and flame -retardant layer adopts polyurethane material. The utility model discloses through the modified nano silicon dioxide realizes excellent oil -repellent performance, makes the sunshade cloth easy to clean, and integrates heat -insulating, reflective, flame -retardant multifunction simultaneously, and the structure is reasonable, and the durability is strong, is applicable to the open -air scene such as car, tent.

Description

Technical Field

[0001] This utility model relates to the field of sunshade fabric technology, and in particular to an easy-to-clean sunshade fabric, specifically an easy-to-clean sunshade fabric with multiple functions such as oleophobicity, heat insulation, light reflection, and flame retardancy, which is particularly suitable for use in outdoor environments such as cars, tents, and outdoor facilities. Background Technology

[0002] Sunshade fabric, also known as shade cloth, is a functional auxiliary fabric used to block sunlight and UV rays. It is often used in combination with other fabrics to cover items to prevent direct contact with strong light, effectively blocking glare and ultraviolet rays. With the increase in outdoor activities and the development of the automotive industry, sunshade fabric is being used more and more widely in outdoor environments, such as car sunshades, camping tents, and outdoor billboards.

[0003] While the functionality of existing sunshade fabrics is constantly being enhanced, many problems still exist. For example, utility model patent CN215512661U discloses an environmentally friendly sunshade fabric, including a body with a drainage mechanism in the middle. The body includes a base layer, a PA silver coating on top of the base layer, a first flame-retardant layer on top of the PA silver coating, a finishing layer on top of the first flame-retardant layer, a waterproof layer below the base layer, a second flame-retardant layer below the waterproof layer, and a protective layer below the second flame-retardant layer. The aforementioned application, through the drainage mechanism, can easily drain water accumulated in the middle of the body, preventing excessive weight from the central area from causing strain on the sides of the body, thus contributing to its long-term use.

[0004] However, currently available shade fabrics easily accumulate dirt, oil stains, dust, and other contaminants when used in outdoor environments. Due to the complexity of outdoor environments, shade fabrics are often exposed to harsh conditions such as sandstorms, rain, and oil stains, making cleaning and maintenance difficult. The main problems with existing shade fabrics include:

[0005] Insufficient stain resistance: Traditional shade fabrics lack effective oil and water repellency, allowing oil stains and dirt to easily penetrate the fibers, forming stubborn stains that are difficult to remove. Ordinary shade fabrics are mostly made of PVC or polyester materials, which have high surface energy and easily absorb pollutants.

[0006] Cleaning is inconvenient: Adhered contaminants require chemical cleaners or high-pressure water guns to be thoroughly removed, which not only increases maintenance costs but may also damage the structure of the shade cloth. The lack of cleaning resources in outdoor environments further complicates the cleaning process.

[0007] Limited Functionality: Most shade fabrics focus solely on shading, lacking integration of multiple functions such as heat insulation, reflection, and flame retardancy. In high-temperature environments, insufficient heat insulation can lead to excessively high internal temperatures; in high-risk outdoor environments, insufficient flame retardancy may cause safety accidents.

[0008] Poor durability: After repeated cleaning, the surface coating of traditional sunshade fabric is prone to wear and peeling, gradually losing its function. Environmental factors such as ultraviolet radiation and temperature changes will accelerate material aging and shorten its service life.

[0009] Environmental concerns: Some shade fabrics use fluorinated compounds as a stain-resistant coating. While these coatings offer good stain resistance, they pose environmental pollution and health risks. More environmentally friendly stain-resistant technologies need to be developed.

[0010] To address the aforementioned problems, the market urgently needs to develop a multifunctional, easy-to-clean, and durable sunshade fabric to overcome the shortcomings of existing technologies. This invention innovatively combines an oleophobic layer, a heat-insulating layer, a reflective layer, and a flame-retardant layer, and uses surface-modified nano-silica as the oleophobic material, effectively solving the problems of sunshade fabrics being easily soiled and difficult to clean during outdoor use. Utility Model Content

[0011] To address the shortcomings of existing technologies, the purpose of this invention is to provide an easy-to-clean sunshade fabric, solving the problem that existing sunshade fabrics easily accumulate mud and oil stains on their surface when used outdoors, making cleaning inconvenient. Simultaneously, this invention also integrates excellent heat insulation, reflective, and flame-retardant properties, meeting the needs of use in complex environments.

[0012] The above-mentioned utility model objective is achieved through the following technical solution:

[0013] This utility model provides an easy-to-clean sunshade fabric, including a sunshade fabric body. The sunshade fabric body includes a polyester layer, and a first oleophobic layer and a second oleophobic layer are respectively disposed on the outer side of the polyester layer. The first oleophobic layer and the second oleophobic layer are respectively located on the outermost layer of the sunshade fabric body. The first oleophobic layer and the second oleophobic layer are made by spraying with surface-modified nano-silica. The surface modification includes grafting fluorosilane or alkylsiloxane. The contact angle of the surface-modified nano-silica is greater than 150° and the surface energy is less than 20mN / m.

[0014] According to one embodiment of the present invention, a first heat insulation layer is provided on one side of the sunshade cloth body. The first heat insulation layer is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / (m·K). A first reflective layer is provided on one side of the first heat insulation layer. The first reflective layer is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of greater than 90%.

[0015] According to one embodiment of the present invention, a first flame-retardant layer is provided on one side of the first reflective layer. The first flame-retardant layer is made of flame-retardant polyurethane spray material with a thickness of 0.05-0.2 mm and a limiting oxygen index greater than 28%. The first flame-retardant layer is bonded to the first oleophobic layer.

[0016] According to one embodiment of the present invention, a second heat insulation layer is provided on the other side of the sunshade cloth body. The second heat insulation layer is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / . A second reflective layer is provided on one side of the second heat insulation layer. The second reflective layer is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of greater than 90%.

[0017] According to one embodiment of the present invention, a second flame-retardant layer is provided on one side of the second reflective layer. The second flame-retardant layer is made of flame-retardant polyurethane spray material with a thickness of 0.05-0.2 mm and a limiting oxygen index greater than 28%. The second flame-retardant layer is bonded to the second oleophobic layer.

[0018] According to one embodiment of the present invention, the sunshade fabric body is provided with edge sealing on all four sides. The edge sealing is made of wear-resistant polyester material with a thickness of 0.3-0.8mm. The edge sealing is provided with fixing buckles, which are connected to the seams of the sunshade fabric body. The fixing buckles are made of stainless steel and there are 4-8 of them.

[0019] According to one embodiment of the present invention, the preparation method of the surface-modified nano silica includes the following steps: dispersing nano silica in an ethanol solution, adding a fluorosilane modifier, reacting at 60-80°C for 2-4 hours, washing and drying to obtain oleophobic nano silica, wherein the amount of fluorosilane modifier added is 5-15% of the mass of nano silica.

[0020] According to one embodiment of the present invention, the thickness of the polyester layer is 0.2-0.6 mm, and the basis weight is 150-300 g / m². 2 The tensile strength is greater than 40 N / cm, and the polyester layer is waterproofed with a hydrostatic pressure greater than 5000 Pa.

[0021] According to one embodiment of this utility model, the silicon-based hydrophobic spray-on thermal insulation material is an aerogel composite material comprising silica aerogel and reinforcing fibers, with a porosity greater than 90% and a specific surface area greater than 600 m². 2 / g, hydrophobic angle greater than 120°.

[0022] According to one embodiment of this utility model, the overall thickness of the sunshade fabric body is 1.5-3.0 mm, and the weight is 800-1500 g / m². 2 It has an ultraviolet protection factor (UPF) greater than 50, a light transmittance of less than 5%, and a service life of more than 5 years.

[0023] In summary, compared with the prior art, the present invention has at least one of the following beneficial technical effects:

[0024] Exceptional ease of cleaning: An oleophobic layer is formed by spraying with surface-modified nano-silica, effectively reducing interfacial tension (surface energy below 20mN / m), making it difficult for water and grease to adhere. With a contact angle greater than 150°, it achieves anti-fouling and anti-fingerprint functions. Cleaning can be done directly with water; oil stains and sludge are easily removed, greatly simplifying the cleaning process.

[0025] Multifunctional integration: The heat insulation layer uses a silicon-based hydrophobic material (such as aerogel), the reflective layer uses a metallized film, and the flame-retardant layer uses polyurethane material. Each layer has a clearly defined material composition, synergistically enhancing the heat insulation, reflectivity, and flame-retardant properties of the sunshade fabric. Tests show that this sunshade fabric can reduce the internal temperature by 10-15℃, reflect over 90% of solar radiation, and achieve a flame-retardant rating of B1.

[0026] High durability: Through optimized design and material selection, each functional layer possesses excellent weather resistance, aging resistance, and mechanical strength. Testing shows that after 100 washing cycles, the shading fabric of this invention retains more than 85% of its oleophobic properties and more than 90% of its heat insulation properties, with a service life of over 5 years.

[0027] Environmentally friendly and safe: Nano-silica is used instead of traditional fluorinated antifouling agents, avoiding environmental pollution and health risks from perfluorinated compounds (PFCs). All materials meet environmental standards and are recyclable.

[0028] Reasonable structure: Through multi-layer composite structure design, the functions are perfectly integrated, while maintaining the flexibility and lightweight of the materials, which facilitates transportation, installation and storage.

[0029] Wide range of applications: Not only suitable for traditional fields such as car sunshades and tents, but also for various scenarios such as outdoor billboards, temporary buildings, and agricultural greenhouses, meeting the needs of different environments. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the sunshade fabric body of this utility model;

[0031] Figure 2 This is a front view of a sunshade cloth that is easy to clean according to this utility model.

[0032] Reference numerals in the attached drawings: 1. Shade fabric body; 2. Edge sealing; 3. Fastening buckle; 4. Polyester layer; 5. First heat insulation layer; 6. First reflective layer; 7. First flame retardant layer; 8. First oleophobic layer; 9. Second heat insulation layer; 10. Second reflective layer; 11. Second flame retardant layer; 12. Second oleophobic layer. Detailed Implementation

[0033] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0034] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0036] Example 1:

[0037] Reference Figure 1 and Figure 2 This utility model discloses an easy-to-clean sunshade fabric, including a sunshade fabric body 1. The sunshade fabric body 1 includes a polyester layer 4. A first oleophobic layer 8 and a second oleophobic layer 12 are respectively disposed on the outer side of the polyester layer 4. The first oleophobic layer 8 and the second oleophobic layer 12 are respectively located on the outermost layer of the sunshade fabric body 1. The first oleophobic layer 8 and the second oleophobic layer 12 are made by spraying with surface-modified nano-silica. The surface modification includes grafting fluorosilane or alkylsiloxane. The contact angle of the surface-modified nano-silica is greater than 150° and the surface energy is less than 20mN / m.

[0038] A first heat insulation layer 5 is provided on one side of the sunshade fabric body 1. The first heat insulation layer 5 is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / (m·K). A first reflective layer 6 is provided on one side of the first heat insulation layer 5. The first reflective layer 6 is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of greater than 90%. A first flame retardant layer 7 is provided on one side of the first reflective layer 6. The first flame retardant layer 7 is made of flame retardant polyurethane sprayed material with a thickness of 0.05-0.2 mm and a limiting oxygen index of greater than 28%. The first flame retardant layer 7 is bonded to the first oleophobic layer 8.

[0039] A second heat insulation layer 9 is provided on the other side of the sunshade fabric body 1. The second heat insulation layer 9 is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / m². A second reflective layer 10 is provided on one side of the second heat insulation layer 9. The second reflective layer 10 is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of greater than 90%. A second flame retardant layer 11 is provided on one side of the second reflective layer 10. The second flame retardant layer 11 is made of flame retardant polyurethane sprayed material or other halogenated flame retardants with a thickness of 0.05-0.2 mm and a limiting oxygen index of greater than 28%. The second flame retardant layer 11 is bonded to the second oleophobic layer 12.

[0040] The sunshade fabric body 1 is surrounded by edge sealing 2. The edge sealing 2 is made of wear-resistant polyester material with a thickness of 0.3-0.8mm. The edge sealing 2 is equipped with fixing buckles 3, which are connected to the seam of the sunshade fabric body 1. The fixing buckles 3 are made of stainless steel and there are 4-8 of them.

[0041] The preparation method of surface-modified nano silica includes the following steps: dispersing nano silica in an ethanol solution, adding a fluorosilane modifier, reacting at 60-80℃ for 2-4 hours, washing and drying to obtain oleophobic nano silica, wherein the amount of fluorosilane modifier added is 5-15% of the mass of nano silica, preferably perfluorooctyltriethoxysilane as the modifier.

[0042] The polyester layer 4 has a thickness of 0.2-0.6 mm and a weight of 150-300 g / m². 2 The tensile strength is greater than 40 N / cm, and the polyester layer 4 is waterproofed with a hydrostatic pressure greater than 5000 Pa, ensuring that the substrate has good mechanical properties and waterproofness.

[0043] Silicon-based hydrophobic sprayable thermal insulation material is an aerogel composite material, comprising silica aerogel and reinforcing fibers, with a porosity greater than 90% and a specific surface area greater than 600 m². 2 With a hydrophobic angle greater than 120°, it exhibits excellent thermal insulation and hydrophobic properties. The overall thickness of the shading fabric body 1 is 1.5-3.0 mm, and its weight is 800-1500 g / m².2 With an ultraviolet protection factor (UPF) greater than 50, light transmittance less than 5%, and a service life of more than 5 years, it meets the needs of long-term use in the field.

[0044] In this embodiment, an easy-to-clean sunshade fabric includes a sunshade fabric body 1, which includes a polyester layer 4. The polyester layer 4 is made of high-density polyester fabric with a thickness of 0.4 mm and a weight of 200 g / m². 2 The tensile strength is 45 N / cm. The polyester layer 4 is waterproofed and withstands a hydrostatic pressure of 6000 Pa, ensuring that the substrate has good mechanical strength and waterproof performance.

[0045] A first oleophobic layer 8 and a second oleophobic layer 12 are respectively disposed on the outer side of the polyester layer 4, and the first oleophobic layer 8 and the second oleophobic layer 12 are located on the outermost layer of the sunshade fabric body 1. The first oleophobic layer 8 and the second oleophobic layer 12 are made by spraying with surface-modified nano-silica. The surface modification process is as follows: nano-silica with a particle size of 20-30 nm is dispersed in an ethanol solution, perfluorooctyltriethoxysilane (10% of the mass of nano-silica) is added, and the reaction is carried out at 70°C for 3 hours. After washing and drying, oleophobic nano-silica is obtained. The modified nano-silica has a contact angle of 155° and a surface energy of 18 mN / m, and has excellent oleophobic and hydrophobic properties.

[0046] A first heat insulation layer 5 is provided on one side of the sunshade fabric body 1. The first heat insulation layer 5 is made of silicon-based hydrophobic sprayed heat insulation material, specifically silica aerogel composite material, with a thickness of 0.3 mm, a thermal conductivity of 0.025 W / (m·K), and a hydrophobic angle of 125°. A first reflective layer 6 is provided on one side of the first heat insulation layer 5. The first reflective layer 6 is made of aluminum foil metallized film with a thickness of 0.05 mm and a reflectivity of 92%. A first flame retardant layer 7 is provided on one side of the first reflective layer 6. The first flame retardant layer 7 is made of flame retardant polyurethane sprayed material with a thickness of 0.1 mm and a limiting oxygen index of 30%. The first flame retardant layer 7 is bonded to the first oleophobic layer 8.

[0047] A second heat insulation layer 9 is provided on the other side of the sunshade fabric body 1. The second heat insulation layer 9 also uses a silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.3 mm. A second reflective layer 10 is provided on one side of the second heat insulation layer 9. The second reflective layer 10 uses an aluminum foil metallized film with a thickness of 0.05 mm. A second flame-retardant layer 11 is provided on one side of the second reflective layer 10. The second flame-retardant layer 11 uses a flame-retardant polyurethane sprayed material with a thickness of 0.1 mm. The second flame-retardant layer 11 is bonded to the second oleophobic layer 12.

[0048] The sunshade fabric body 1 is surrounded by edge sealing 2, which is made of wear-resistant polyester material with a thickness of 0.5mm. The edge sealing 2 is equipped with fixing buckles 3, which are made of stainless steel and are connected to the sunshade fabric body 1 by high-strength stitching. There are 6 fixing buckles 3, which are evenly distributed around the sunshade fabric.

[0049] The overall thickness of the sunshade fabric in this embodiment is 2.2mm, and its weight is 1200g / m². 2 It has a UV protection factor (UPF) of 55 and a light transmittance of 3%. Tests have shown that this sunshade fabric can reduce the internal temperature by 12°C, achieve an oil stain removal rate of over 95%, and has a flame retardant rating of B1.

[0050] Example 2: Material Parameter Optimization Implementation Method:

[0051] In this embodiment, the material parameters of each layer of the sunshade fabric are optimized to meet the higher requirements of the usage environment.

[0052] The polyester layer 4 is made of ultra-fine polyester fiber, with a thickness of 0.25 mm and a weight of 180 g / m². 2 The tensile strength is 50 N / cm, and the hydrostatic pressure reaches 7000 Pa. The polyester fiber undergoes plasma treatment to introduce hydrophilic groups on the surface, improving its bonding strength with the functional layer.

[0053] The oleophobic layer utilizes nano-silica that has undergone dual modification with fluorosilanes and alkylsiloxanes. The modification process involves pretreating the nano-silica with 3-aminopropyltriethoxysilane, followed by the addition of perfluorooctyltriethoxysilane, and reacting at 75°C for 3.5 hours. The resulting modified nano-silica achieves a contact angle of 160° and a surface energy reduction to 15 mN / m, exhibiting significantly improved oleophobic properties.

[0054] The thermal insulation layer is a composite material of nanoporous silica aerogel and ceramic fiber, with a thickness of 0.4 mm, a thermal conductivity of 0.022 W / (m·K), and a hydrophobic angle of 130°. The aerogel content is 70%, and the ceramic fiber acts as a reinforcement to improve the flexibility and strength of the material.

[0055] The reflective layer uses a multi-layer composite metallized film, including an aluminum foil layer, a titanium dioxide layer, and a silicon dioxide protective layer, with a total thickness of 0.08 mm and a reflectivity of 95%. The silicon dioxide protective layer prevents the aluminum foil from oxidizing and extends its service life.

[0056] The flame-retardant layer is made of polyurethane material modified with nano-magnesium hydroxide, with a thickness of 0.15 mm and a limiting oxygen index of 32%. The addition of nano-magnesium hydroxide not only improves the flame-retardant performance but also enhances the smoke suppression effect of the material.

[0057] The overall thickness of the sunshade fabric in this embodiment is 2.5mm, and its weight is 1000g / m².2 It has a UPF of 60 and a light transmittance of 2%. It is especially suitable for high-temperature and high-UV environments, such as car sunshades in desert areas.

[0058] Example 3: Low-cost and practical implementation method:

[0059] For cost-sensitive applications, this embodiment provides an economical and practical sunshade fabric solution.

[0060] The polyester layer 4 is made of conventional polyester fabric with a thickness of 0.5 mm and a weight of 250 g / m². 2 The tensile strength is 35 N / cm, and the hydrostatic pressure is 4500 Pa. By optimizing the weaving process, the cost is reduced while ensuring performance.

[0061] The oleophobic layer is made of nano-silica modified with alkylsiloxane, and the modifier is hexadecyltrimethoxysilane, which has a low cost. The modification process is carried out at 65°C for 2 hours. The resulting oleophobic material has a contact angle of 145° and a surface energy of 22mN / m, which still meets the basic oleophobic requirements.

[0062] The insulation layer is made of a composite material of expanded perlite and silicone rubber, with a thickness of 0.2 mm and a thermal conductivity of 0.035 W / (m·K). Expanded perlite is inexpensive and has good thermal insulation performance, while the silicone rubber coating provides hydrophobicity.

[0063] The reflective layer uses aluminized PET film with a thickness of 0.03mm and a reflectivity of 88%. PET film is less expensive than aluminum foil and has better flexibility.

[0064] The flame-retardant layer is a blend of chlorinated paraffin and polyurethane, with a thickness of 0.08 mm and a limiting oxygen index of 26%. Although its flame-retardant performance is slightly lower than that of the previous two embodiments, it still meets general usage requirements.

[0065] The overall thickness of the sunshade fabric in this embodiment is 1.8mm, and its weight is 900g / m². 2 It has an ultraviolet protection factor (UPF) of 40 and a light transmittance of 4%. The cost is 30% lower than that of Example 1, making it suitable for large-scale applications that are price-sensitive.

[0066] Example 4: High-performance special implementation method:

[0067] For applications requiring use in extreme environments, this embodiment provides a high-performance sunshade fabric solution.

[0068] The polyester layer 4 is a blend of aramid fiber and polyester, with a thickness of 0.3 mm and a weight of 280 g / m². 2The tensile strength is 60 N / cm, and the hydrostatic pressure is 8000 Pa. The addition of aramid fibers significantly improves the material's heat resistance and flame retardancy.

[0069] The oleophobic layer is made of nano-silica synergistically modified with fluorosilane and carbon nanotubes. Fluorosilane is first grafted onto the surface of the nano-silica, and then carboxylated carbon nanotubes are added to form a three-dimensional oleophobic network through chemical bonding. This oleophobic layer achieves a contact angle of 165°, a surface energy of only 12 mN / m, and excellent wear resistance.

[0070] The insulation layer employs a composite structure of vacuum insulation board (VIP) and aerogel, with a thickness of 0.5 mm and a thermal conductivity of 0.015 W / (m·K). The vacuum insulation board provides the core insulation performance, while the aerogel layer fills the gaps and provides hydrophobic functionality.

[0071] The reflective layer employs a composite structure of a silver reflective film and a transparent conductive oxide, with a thickness of 0.1 mm and a reflectivity of 98%. The silver layer provides high reflectivity, while the transparent conductive oxide prevents the silver layer from oxidizing and improves conductivity.

[0072] The flame-retardant layer is a composite material of phosphorus-nitrogen intumescent flame retardant and silicone rubber, with a thickness of 0.2 mm and a limiting oxygen index of 35%. The intumescent flame retardant forms a dense char layer when heated, resulting in a significant flame-retardant effect and environmental friendliness.

[0073] The overall thickness of the sunshade fabric in this embodiment is 3.0mm, and its weight is 1500g / m². 2 It has an ultraviolet protection factor (UPF) of 80 and a light transmittance of 1%. It is suitable for special fields such as military and aerospace.

[0074] Detailed description of the preparation process:

[0075] The preparation process of this utility model sunshade cloth includes the following steps:

[0076] Substrate pretreatment: The polyester layer 4 is cleaned and plasma treated to improve surface activity and adhesion.

[0077] Functional layer coating: A multi-layer co-extrusion or sequential coating process is used to form a heat insulation layer, a reflective layer, a flame retardant layer, and an oleophobic layer in sequence. The coating method can be selected from scraping, spraying, or dipping, and the specific parameters are adjusted according to the material characteristics.

[0078] Preparation of modified nano-silica: Nano-silica is dispersed in a solvent, a modifier is added, and the reaction is carried out under controlled temperature and time. After post-treatment, oleophobic nano-silica is obtained.

[0079] Oleophobic layer formation: Modified nano-silica is formulated into a coating and uniformly applied to the surface of the flame-retardant layer by spraying. After curing, an oleophobic layer is formed.

[0080] Post-processing: hot pressing, cutting, edge sealing, and fastening buckle installation are carried out to obtain the final product.

[0081] Key process control points include coating uniformity, interlayer adhesion strength, and functional performance indicators. Large-scale stable production can be achieved by optimizing process parameters.

[0082] Performance testing and data analysis:

[0083] The performance of the sunshade fabrics of various embodiments of this utility model was tested, and the results are as follows:

[0084] Oleophobic properties: Contact angle and droplet sliding angle were tested according to GB / T 22899-2008 standard. Example 1: Contact angle 155°, droplet sliding angle 10°; Example 2: Contact angle 160°, droplet sliding angle 8°; Example 3: Contact angle 145°, droplet sliding angle 15°; Example 4: Contact angle 165°, droplet sliding angle 5°. All examples exhibited good oleophobic properties.

[0085] Thermal insulation performance: Thermal conductivity and temperature difference were tested according to GB / T 11048-2018 standard. At 1000W / m... 2 Under thermal radiation, the temperature difference between the inside and outside of Example 1 was 12°C, the temperature difference in Example 2 was 15°C, the temperature difference in Example 3 was 8°C, and the temperature difference in Example 4 was 18°C.

[0086] Flame retardant performance: The flame retardant rating was tested according to GB 8624-2012 standard. Examples 1 and 2 achieved B1 rating, Example 3 achieved B2 rating, and Example 4 achieved A rating.

[0087] Durability: After 1000 hours of xenon lamp aging test, the performance retention rate of each embodiment was above 80%. After 100 washing cycles, the oleophobic property retention rate was greater than 85%.

[0088] Environmental performance: All materials meet the environmental requirements according to RoHS standards, and no harmful substances were detected.

[0089] Test results show that the sunshade cloth of this invention has excellent overall performance and meets the needs of various application scenarios.

[0090] Application Examples:

[0091] The sunshade cloth of this invention can be widely used in the following scenarios:

[0092] Car sunshades: Used to shade the windshields and windows of cars, preventing excessive heat inside the vehicle and premature aging of the interior. An oleophobic coating makes the sunshades easy to clean and extends their lifespan.

[0093] Outdoor tent: Used for the outer protective layer of camping tents, providing heat insulation, waterproofing, and flame retardancy. Mud and oil stains that easily accumulate in the wild can be easily washed off.

[0094] Temporary building protection: Used for temporary fencing and protection of construction sites to resist wind and rain erosion, and is easy to maintain and clean.

[0095] Agricultural greenhouse: The outer covering material used in agricultural greenhouses to regulate the internal temperature and prevent dust accumulation from affecting light transmission.

[0096] Outdoor billboards: The base material used for outdoor billboards keeps the advertising image clean and reduces maintenance costs.

[0097] In practical applications, users have reported that the sunshade cloth of this invention is easy to clean, has stable performance, and a long service life, resulting in significant economic and social benefits.

[0098] The implementation principle of this utility model is as follows: This utility model discloses an easy-to-clean sunshade fabric, relating to the field of sunshade fabric technology. The sunshade fabric includes a body, which comprises a polyester layer. A first oleophobic layer and a second oleophobic layer are disposed on the outer side of the polyester layer. The oleophobic layer is made by spraying with surface-modified nano-silica. A heat insulation layer, a reflective layer, and a flame-retardant layer are sequentially disposed on both sides of the sunshade fabric body. The heat insulation layer uses a silicon-based hydrophobic material, the reflective layer uses an aluminum foil film, and the flame-retardant layer uses a polyurethane material. This utility model achieves excellent oleophobic properties through modified nano-silica, making the sunshade fabric easy to clean. It also integrates multiple functions such as heat insulation, reflectivity, and flame retardancy, has a reasonable structure, and strong durability, making it suitable for outdoor scenarios such as cars and tents.

[0099] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An easy-to-clean sunshade fabric, comprising a sunshade fabric body (1), characterized in that: The sunshade fabric body (1) includes a polyester layer (4), and a first oleophobic layer (8) and a second oleophobic layer (12) are respectively provided on the outer side of the polyester layer (4). The first oleophobic layer (8) and the second oleophobic layer (12) are respectively located on the outermost layer of the sunshade fabric body (1). The first oleophobic layer (8) and the second oleophobic layer (12) are made by spraying with surface-modified nano-silica. The surface modification includes grafting fluorosilane or alkylsiloxane. The surface-modified nano-silica has a contact angle greater than 150° and a surface energy less than 20mN / m.

2. The easy-to-clean sunshade fabric according to claim 1, characterized in that: A first heat insulation layer (5) is provided on one side of the sunshade cloth body (1). The first heat insulation layer (5) is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / (m·K). A first reflective layer (6) is provided on one side of the first heat insulation layer (5). The first reflective layer (6) is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of greater than 90%.

3. The easy-to-clean sunshade fabric according to claim 2, characterized in that: A first flame-retardant layer (7) is provided on one side of the first reflective layer (6). The first flame-retardant layer (7) is made of flame-retardant polyurethane spray material with a thickness of 0.05-0.2 mm and a limiting oxygen index greater than 28%. The first flame-retardant layer (7) is bonded to the first oleophobic layer (8).

4. The easy-to-clean sunshade fabric according to claim 1, characterized in that: A second heat insulation layer (9) is provided on the other side of the sunshade cloth body (1). The second heat insulation layer (9) is made of silicon-based hydrophobic sprayed heat insulation material with a thickness of 0.1-0.5 mm and a thermal conductivity of less than 0.03 W / (m·K). A second reflective layer (10) is provided on one side of the second heat insulation layer (9). The second reflective layer (10) is made of aluminum foil metallized film with a thickness of 0.02-0.1 mm and a reflectivity of more than 90%.

5. The easy-to-clean sunshade fabric according to claim 4, characterized in that: A second flame-retardant layer (11) is provided on one side of the second reflective layer (10). The second flame-retardant layer (11) is made of flame-retardant polyurethane spray material with a thickness of 0.05-0.2 mm and a limiting oxygen index greater than 28%. The second flame-retardant layer (11) is bonded to the second oleophobic layer (12).

6. The easy-to-clean sunshade fabric according to claim 1, characterized in that: The sunshade fabric body (1) is provided with edge sealing (2) on all four sides. The edge sealing (2) is made of wear-resistant polyester material with a thickness of 0.3-0.8mm. The edge sealing (2) is provided with fixing buckles (3). The fixing buckles (3) are connected to the seam of the sunshade fabric body (1). The fixing buckles (3) are made of stainless steel and there are 4-8 of them.

7. The easy-to-clean sunshade fabric according to claim 1, characterized in that: The polyester layer (4) has a thickness of 0.2-0.6 mm and a basis weight of 150-300 g / m². 2 The tensile strength is greater than 40 N / cm, and the polyester layer (4) is waterproofed with a hydrostatic pressure greater than 5000 Pa.

8. The easy-to-clean sunshade fabric according to claim 2, characterized in that: The silicon-based hydrophobic spray-on thermal insulation material is an aerogel composite material, comprising silica aerogel and reinforcing fibers, with a porosity greater than 90% and a specific surface area greater than 600 m². 2 / g, hydrophobic angle greater than 120°.

9. The easy-to-clean sunshade fabric according to claim 1, characterized in that: The overall thickness of the sunshade fabric body (1) is 1.5-3.0 mm, and its weight is 800-1500 g / m². 2 It has an ultraviolet protection factor (UPF) greater than 50 and a light transmittance of less than 5%.

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