Automobile skylight roller shutter cloth with six-functional-layer composite structure

Abstract

The invention provides automobile skylight roller shutter cloth with a six-functional-layer composite structure, and relates to the technical field of automobile textiles. The automobile skylight roller shutter cloth with the six-functional-layer composite structure sequentially comprises a rare earth / graphene radiation cooling fabric layer, a first PUR dispensing layer, a silver reflective coating, a black TPU base film layer, a second PUR dispensing layer and an interior fabric layer from top to bottom. The woven fabric with the radiation cooling function and the composite fabric with the six functional layers of the woven fabric have the capability of reversely dissipating sunlight heat penetrating through skylight glass on the top of an automobile to the atmosphere outside the automobile and even the outer space through the skylight glass through absorption reflection and infrared radiation. The functions of cooling, heat insulation, shading, beautification and decoration of the six-layer composite skylight roller shutter fabric for the vehicle are achieved through the effects of absorption, reflection and anti-radiation of infrared rays.

Description

Technical Field

[0001] This invention relates to the field of automotive textile technology, specifically to a car sunroof roller blind fabric with a six-functional-layer composite structure. Background Technology

[0002] Sunroofs were first designed and manufactured by the German company Webasto in the 1930s and applied to a luxury car brand. They effectively improve interior ventilation and lighting. In the early days of gasoline-powered cars, sunroofs were generally manually operated and had a low adoption rate, with slow product and technological development. Until the 1960s, sunroof penetration exceeded 10-20%, and was only found in luxury cars. In the mid-1990s, Chinese sunroof manufacturers began production, and the sunroof configuration rate gradually climbed to 30-40%, starting to spread to mid-to-low-end brands. In the first decade of this century, panoramic sunroof technology matured, and its penetration rate further increased to over 50%, with some brands offering sunroofs as standard across their entire lineup. After 2020, sunroof penetration exceeded 65%, with panoramic sunroofs accounting for over 70% of passenger car sunroof configurations, becoming a mainstream feature. Especially with the development of new energy vehicles in China, electric sunroofs have almost become standard equipment, with mid-to-large SUVs featuring panoramic electric sunroofs as standard across their entire lineups.

[0003] The interior textiles and their composite structures used in the sunshade mechanism below the sunroof glass have also undergone several generations of development:

[0004] 1. In the early stages of sunroof technology development, sunroofs were manual, with a manually operated pull-out sun visor. The inner side of the pull-out visor simply needed to be fitted with the interior fabric to maintain consistency with the overall style of the headliner. This type of manual pull-out visor could be directly fitted with the car's interior fabric, or the interior fabric could be laminated with a thin sponge before being fitted to the inner side of the visor.

[0005] 2. Later, the sunroof control method was changed from manual to electric, and the rigid sunshade opening and closing device, the pull panel below the sunroof, gradually transitioned to a flexible opening and closing rolling device, such as an electric roller blind. The interior sunshade fabric is no longer attached to the inside of the rigid pull panel, but is directly rolled up or stretched out electrically for use. It can be a single layer of interior fabric or a three-in-one composite structure fabric composed of an interior fabric and an outer black woven fabric (with an adhesive layer in between the two layers).

[0006] 3. With the advent of electric vehicles, sunroofs have become increasingly larger, evolving into panoramic sunroofs exceeding 1 square meter. The electric sunshades beneath them have also become more complex in function and structure. They need to provide complete light blocking, sound insulation, noise reduction, and heat insulation. Therefore, they are typically composed of a five-in-one composite fabric: a black woven light-blocking layer on the back, a TPU elastic film layer in the middle, an inner decorative fabric, and two layers of PUR hot melt adhesive bonding the two fabrics to the inner and outer sides of the TPU film.

[0007] Solar heat travels from the distant sky through the sunroof to the car interior, raising the temperature and making it unbearable for passengers in hot summers. This heat is absorbed and converted into heat by solar radiation. Sunlight consists of electromagnetic waves of varying frequencies and wavelengths with different energy densities. The energy distribution is roughly as follows: visible light accounts for approximately 44%, infrared light for approximately 53%, and ultraviolet light for approximately 3%. This distribution may vary slightly depending on the region and season. A large portion of the ultraviolet radiation is absorbed and reflected back into the outside world through the sunroof. Therefore, the sunlight radiating into the car interior through the sunroof and converting into heat is primarily visible and infrared. In other words, by absorbing, reflecting, and redirecting the visible and infrared energy passing through the sunroof, the hot environment in the passenger compartment can be significantly improved, reducing the energy consumption of the car's air conditioning, lessening the load on the battery, and increasing the driving range of electric vehicles.

[0008] Currently, most cars equipped with panoramic sunroofs don't have electrically retractable roller blinds, resulting in noticeable discomfort from summer solar heat radiation and a heavy load on the air conditioning. A large proportion also use traditional five-in-one composite roller blinds, with only a few high-end cars now offering full blackout options. Even with these two types of five-in-one composite roller blinds, which only block some sunlight from entering the passenger compartment, the air conditioning load remains relatively high, lacking active radiant cooling functionality. With the increasing popularity of electric vehicles and car owners' growing pursuit of comfort, environmental friendliness, and energy efficiency, the development of new functional composite roller blind structures and products with highly efficient active radiant cooling is becoming increasingly necessary. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a car sunroof roller blind fabric with a six-functional-layer composite structure. This woven fabric with radiative cooling function and its six-functional-layer composite fabric have the ability to absorb and reflect solar heat passing through the sunroof glass of the car roof, and to divert it back through the sunroof glass to the outside atmosphere and even outer space through infrared radiation. Through this absorption, reflection, and infrared radiation, this six-layer composite car sunroof roller blind fabric achieves its functions of cooling, heat insulation, light blocking, and aesthetic decoration.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A car sunroof roller blind fabric with a six-functional-layer composite structure, wherein the six-functional-layer composite structure consists of, from top to bottom, a rare earth / graphene radiation cooling fabric layer, a first PUR adhesive layer, a silver reflective coating, a black TPU base film layer, a second PUR adhesive layer, and an interior fabric layer; the rare earth / graphene radiation cooling fabric layer is a woven fabric with a twill weave of rare earth polyester filaments containing rare earth metal inorganic compound powder as warp and graphene polyester filaments containing graphene as weft, and the twill weave is any one of the standard twill weaves of 1 bottom / 3 top, 1 bottom / 4 top, or 1 bottom / 5 top, and when used in composite applications, the warp side with more warp threads is the bonding surface with the first PUR hot melt adhesive.

[0012] Preferably, the twill weave is a 1-down / 4-up standard twill weave, which balances the fabric's softness, surface smoothness, and surface abrasion resistance due to the layered arrangement of the two functional fibers.

[0013] Preferably, the rare earth polyester filament is a polyester-based filament with a lanthanide rare earth inorganic compound micro-nano powder content of more than 1.0%, which absorbs infrared and visible light and converts light energy into heat energy; its filament morphology is FDY fully drawn multifilament or DTY textured multifilament.

[0014] Preferably, when the rare earth polyester filament is DTY textured multifilament, the specification range is 50D-150D, and the multifilament F number is in the range of 36F-72F.

[0015] Preferably, the graphene content in the graphene polyester filament is 0.1%-0.3%, and the filament morphology is FDY fully drawn multifilament or DTY textured multifilament.

[0016] Preferably, when the graphene polyester filament is DTY textured multifilament, the specification range is 50D-150D, and the multifilament F number is in the range of 36F-144F.

[0017] Preferably, both the first PUR dispensing layer and the second PUR dispensing layer are dotted PUR adhesive hot melt coatings, with a dot density ranging from 80 to 250 dots / cm², and a coating amount ranging from 8 to 20 grams / cm² when laminating one side.

[0018] Preferably, the black TPU base film layer is made by mixing black light-absorbing microparticles into TPU material, with a basis weight range of 25-45 g / m² and a thickness of 0.018-0.035 mm.

[0019] Preferably, the silver reflective coating is a silver PU coating containing reflective aluminum powder coated on the surface of a black TPU base film.

[0020] Preferably, the interior fabric layer is any one of knitted automotive interior fabric, woven automotive interior fabric, automotive non-woven microfiber leather fabric, and imitation leather automotive interior fabric.

[0021] This invention provides a car sunroof roller blind fabric with a six-functional-layer composite structure, which has the following advantages compared with the prior art:

[0022] This invention combines six functional layers—one for absorbing and heating visible and infrared light, the other for reflecting and reverse infrared radiation—into a passive active radiative cooling roller blind composite fabric structure, along with a rare-earth graphene woven composite roller blind fabric with passive active radiative cooling functionality. It significantly reduces solar heat generation compared to panoramic skylights without roller blinds (such as those with only colored and patterned awnings on the lower surface of the skylight glass), and also noticeably reduces solar heat generation compared to traditional five-in-one sunshade roller blinds. This is a novel, green composite roller blind structure and product that effectively improves the temperature environment of the passenger cabin in summer and is energy-saving and environmentally friendly.

[0023] This invention selects graphene, a material that heats up rapidly through infrared radiation and emits strong infrared rays, as the primary infrared emitting material. Graphene's planar structure results in low thermal resistance, rapid heat transfer, and strong infrared radiation emission. This synergistic mechanism of "rapid heat transfer—heat absorption and heating—high infrared radiation cooling and heat dissipation" is unmatched by many other materials with infrared absorption and emission capabilities. A graphene content of 0.1%-0.3% in the graphene-based polyester filament weft yarn exhibits significant infrared emission, balanced spinning and weaving quality control, and price advantages. The filaments can be either fully drawn FDY multifilament or textured DTY multifilament; DTY filament fabrics shrink and expand during subsequent heat treatment, with the fibers bending and spreading out to maximize the surface area of ​​the skylight glass, resulting in better radiative cooling by emitting infrared rays that carry away heat. Single-layer graphene has relatively poor visible light absorption; approximately 43% of visible light in sunlight requires other efficient materials for reflection, absorption, and conversion.

[0024] Polyester fibers containing rare earth compounds can absorb incident visible and infrared light and convert it into heat, thus warming the fabric. The principle is as follows: Rare earth elements (such as lanthanum and cerium) have unique electronic structure; their unfilled 4f electron layer resonates with and absorbs infrared light incident through the sunroof, converting it into heat and warming the fabric. Rare earth elements can absorb visible light and near-infrared solar light (400nm-2.5μm) and store this light energy as heat through their crystal structure. Under sunlight, rare earth fibers can heat up rapidly and transfer the heat to graphene in the graphene fibers, allowing the incident solar energy to radiate outwards as infrared rays through the sunroof glass with higher efficiency. This achieves passive automatic radiative cooling, reducing the load on the car's air conditioning system in summer.

[0025] The most efficient weave structure for fabrics composed of these two types of fibers is with the graphene fiber layer facing the sunroof glass and the rare earth fiber layer distributed in the lower layer. A single fabric fiber layer cannot absorb all incident sunlight, and the reflected infrared radiation cannot only radiate outwards towards the sunroof glass. If this light continues to radiate into the vehicle, it will still raise the temperature of the passenger compartment, resulting in a relatively high load on the vehicle's air conditioning system in summer. This necessitates functional optimization of the membrane layer in traditional five-in-one roller blind composite fabrics. Specifically, at least two improvements are required:

[0026] 1. The traditional TPU flexible film is changed from transparent or semi-gloss to a black film with added light absorbers such as carbon black. This will further convert the absorption of visible light and infrared rays that pass through the upper rare earth graphene fabric layer into heat, thus raising the temperature of the composite fabric layer.

[0027] 2. Further, a reflective coating is applied to the composite surface of the black film layer and the upper fabric layer. Micron-sized aluminum powder can be added to this reflective coating as a reflective agent. This reflects visible light and infrared electromagnetic waves that strike the surface back, where they are further absorbed and reflected back by the upper rare-earth graphene fabric layer, or reflected directly through the fiber gaps. Although the reflective TPU coating on this TPU black film is very thin, it is very effective in reducing solar energy entering the car interior in summer, a development concept behind many sunshades for sun protection and heat insulation. Moreover, the base material is TPU, ensuring good elasticity and bonding strength with the lower TPU black film. In addition to excellent reflective properties, aluminum powder and other metal particles also have excellent heat transfer properties. They can more quickly transfer the heat collected by the lower black film to the upper rare-earth fabric layer and the graphene layer above it. The graphene layer heats up and receives energy, which is then converted into infrared energy emitted by the graphene, thus enhancing the radiative cooling effect.

[0028] With these three rationally distributed and mutually cooperating functional layers, the bonding of them with the inner automotive interior fabric relies on the first and second PUR dot-distributed hot melt adhesive layers. The resulting structure of this novel six-in-one composite roller blind fabric is shown in the attached image. Figure 1 As shown. For electric vehicles that are sensitive to range anxiety and energy consumption, this new composite structure of electric roller blind fabric offers superior air conditioning energy efficiency and summer cabin comfort. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the heat insulation test chamber used for testing in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the six-functional-layer composite structure of the automotive sunroof roller blind fabric of the present invention. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1:

[0033] A six-in-one composite roller blind fabric consisting of a 1 / 4 twill rare earth graphene radiation cooling woven fabric, a reflective black film, and a warp-knitted interior fabric.

[0034] The structure from top to bottom consists of: rare earth / graphene radiation cooling fabric layer, first PUR adhesive layer, silver reflective coating, black TPU base film layer, second PUR adhesive layer, and interior fabric layer.

[0035] The selection of each layer:

[0036] 1. Design of rare earth / graphene radiation cooling fabric layer:

[0037] 1.1 Warp yarn selection: Polyester-based lanthanide rare earth DTY 75D / 48F filament produced by Baotou Steel Rare Earth Research Institute is selected as the warp yarn;

[0038] 1.2 Weft yarn selection: Polyester-based graphene yarn DTY 75D / 48F (Jiangshanhong graphene polyester-based gray DTY 75D / 48F) from Jiangsu Jiangshanhong Special Chemical Fiber Co., Ltd. is selected as the weft yarn for the outermost layer of the fabric to emit infrared cooling function;

[0039] To compare the differences in infrared heating and natural cooling rates between the two functional yarns mentioned above and common polyester and nylon yarns, the following experiment was conducted to verify this:

[0040] A. Baotou Rare Earth Polyester-Based Light Greenish Gray DTY 75D / 48F (Polyester-Based Lanthanide Rare Earth DTY 75D / 48F Filament);

[0041] B. Jiangshan Red Graphene Polyester Base Gray DTY 75D / 48F;

[0042] C. Shenghong Chemical Fiber Polyester DTY 75D / 48F;

[0043] D. Nylon 6 DTY 70D / 24F;

[0044] All four types of yarn were treated with a yarn binder of 30,000D (400 turns for 75D and 428 turns for 70D). The yarn was folded twice and then placed in boiling water at 100°C for 3 minutes to shrink and expand. After drying in an 80°C oven and cooling to room temperature, the yarn was tested for temperature rise and natural cooling at a distance of 15cm under a 250W far-infrared heating lamp. The data are shown in Table 1 below (tested using a handheld infrared non-contact thermometer).

[0045] Table 1

[0046]

[0047] Based on the infrared heating and natural cooling data of the yarns mentioned above, both rare earth and graphene yarns exhibit good infrared heating performance, which is related to their infrared absorption characteristics. In particular, graphene yarn heats up faster when energy is supplied, possibly due to the rapid heat transfer properties of graphene. Similarly, when the heater is removed and the yarns cool naturally, both rare earth and graphene yarns cool down relatively quickly. This is related to their energy-consuming cooling characteristics when radiating infrared radiation at high temperatures. Graphene yarn, in particular, cools down even faster at high temperatures, possibly due to the higher infrared emissivity and surface heat transfer efficiency of graphene.

[0048] Therefore, it is reasonable for this invention to select rare earth fibers as the bottom layer of the upper twill woven warp yarns of the composite roller blind, and it is also reasonable to select graphene fibers as the surface layer of the upper twill woven weft yarns of the composite roller blind.

[0049] 1.3 Process Parameters:

[0050] The 230 model water jet loom features a 1 / 4 standard twill weave. The warp and weft yarns are made of lanthanide light-absorbing and heat-generating rare earth polyester filament DTY 75D / 48F produced by Baotou Rare Earth Research Institute as the warp yarn and gray graphene polyester DTY 75D / 48F produced by Hai'an Jiangshan Hong Special Chemical Fiber Company as the weft yarn. The fabric width on the loom is 202cm, and the warp and weft density is 46x38 threads / cm.

[0051] 1.4 The finishing process and results of the grey fabric are as follows:

[0052] This invention's radiant cooling woven fabric, because it has a reflective black TPU layer underneath as a light-absorbing and light-shielding layer, can be base-treated with the natural light green-gray of the rare earth warp yarns and the light gray of the graphene polyester weft yarns without dyeing. This avoids the use of high-light-fastness disperse dyes and their costly dyeing processes used in automotive fabrics, thus promoting energy conservation and emission reduction, lowering costs, and ensuring ultra-high colorfastness (natural fiber color, more reliable fastness). Therefore, the finishing process is simple as follows:

[0053] Raw fabric --- overflow refining, cleaning, pre-shrinking and expanding --- shaping --- fabric inspection and winding --- laminating onto the reflective coating surface of the film;

[0054] Key quality control parameters for post-processing:

[0055] Finished width after shaping: 178cm; Finished weight per square meter: 47 + 38.85 = 86 ± 1g / m² 2 Of which rare earth polyester warp yarns account for 54.75% and graphene polyester weft yarns account for 45.25%; the finished warp and weft density is 52.2 x 41 yarns / cm; the heat shrinkage in the warp and weft directions at 140℃ for 15 seconds is no more than 2%. The infrared emissivity is 0.92.

[0056] 2. The TPU black film with a silver reflective coating and its composite process with the above-mentioned radiant cooling woven fabric.

[0057] 2.1 The silver reflective coating on the TPU black film is made of 20g / m² 2 A 17g / m² layer is then coated onto the surface of a black light-absorbing TPU film. 2 This composite film features a two-layer structure formed by TPU coatings containing reflective aluminum powder on both sides. The addition of black carbon powder and reflective aluminum powder effectively improves the lightfastness of the TPU and extends its service life. It functions by reflecting light (visible and infrared) on the upper surface and absorbing light to generate heat in the lower layer, transferring the heat from the film to the upper and lower fabric layers. This silver-black TPU film is 0.02mm thick, weighs 37 grams per square meter, and possesses excellent elasticity, light-blocking and anti-seepage properties, and durability.

[0058] 2.2 First PUR hot melt adhesive layer lamination process

[0059] On a PUR laminating machine, using a 1200-dot dense gluing roller, PUR hot melt adhesive is used to laminate the warp side (the side with the most rare earth warp yarns) of the top rare earth / graphene radiation-cooled fabric layer to the silver-coated side of the silver-coated TPU black film. The amount of PUR adhesive used in the coating is 12±1g / m². 2 After laminating the roll into a composite, seal the roll and place it in a curing chamber for 48 hours before laminating the next side.

[0060] 3. The lower layer of automotive interior fabric is laminated with the other side of the TPU black film using a composite process.

[0061] 3.1 Selection of Interior Fabrics

[0062] The choice of interior trim fabric for the inner layer is based on the OEM's selection (currently, German, American, and domestic OEMs generally use knitted fabrics, especially warp-knitted fabrics; Japanese and Korean OEMs also use woven or weft-knitted fabrics, and many high-end cars also choose microfiber leather, etc.) and color. In this example, a gray warp-knitted fabric with a weight of 145 grams per square meter and a thickness of 0.45 mm is selected as the inner trim fabric.

[0063] 3.2 Second PUR hot melt adhesive layer lamination process

[0064] On a PUR laminating machine, using a coating engraving roller with a density of 800-1200 dots / square inch (1200 dots in this example), PUR hot melt adhesive is used to laminate the back of the customer-selected warp-knitted fabric to the black side of the TPU black film using a coating engraving roller. The amount of PUR adhesive used for coating is 10±1g / m². 2 After the composite roll is sealed and placed in a curing chamber for 48 hours, the next pre-shrinking and sizing process is carried out.

[0065] 4. Pre-shrinking and flattening

[0066] The six-in-one radiant cooling, heat insulation, and light-blocking composite roller blind fabric, after two layers of lamination, may still have residual internal stress such as tension from the aforementioned processing. Therefore, it requires a 140-degree x 20-second test at 0.5 kg / cm². 2 The pre-shrinking and stress-relief process of the flatbed ironing machine stabilizes the size and shape, which helps reduce deformation of the roller blind after loading and makes it more reliable.

[0067] 5. After pre-shrinking and flattening, the composite fabric can be cut into pieces, and its appearance and internal quality indicators can be tested. After passing the inspection, it can be shipped to the skylight accessories factory for fine cutting and then assembled into a roller blind.

[0068] 6. Key performance indicators of the sample in this embodiment

[0069] Weight per square meter: 290±3g / m² 2 The warp and weft heat shrinkage is ≤1%, the thickness is 0.68±0.01mm, the light blocking rate is ≥99%, the infrared emissivity is ≥0.93, and other physical properties meet the requirements of the OEM.

[0070] Comparative example:

[0071] A five-in-one composite roller blind fabric consisting of 1 / 4 twill 75D black yarn woven fabric, TPU transparent film, and warp-knitted interior fabric.

[0072] 1. Top layer 1 / 4 twill black blackout woven fabric base fabric process

[0073] 1.1 Fabric weaving process:

[0074] The 230 type water jet loom has a 1 / 4 standard twill weave. The raw materials for both warp and weft yarns are polyester solution spun black filament DTY 75D / 48F from Shenghong Chemical Fiber Company. The fabric width on the loom is 202cm, and the warp and weft density is 46x38 threads / cm.

[0075] 1.2 The finishing process and results of the grey fabric are as follows:

[0076] Greige fabric --- overflow refining, cleaning, pre-shrinking and expanding --- setting --- fabric inspection and winding --- lamination

[0077] Key quality control parameters for post-processing:

[0078] Finished width after shaping: 178cm; finished weight per square meter: 86±1g / m² 2 Finished product warp and weft density: 52.2 x 41 threads / cm; heat shrinkage in the warp and weft directions at 140℃ for 15 seconds is no more than 2%. Infrared emissivity: 0.81; light blocking rate: ≥83%.

[0079] 2. TPU black film and its lamination process with the above-mentioned black light-absorbing woven fabric

[0080] 2.1 The TPU black film incorporates black carbon powder to absorb light, generate heat, and transfer the heat from the film to the upper and lower fabric layers. This black TPU film is 0.02mm thick, weighs 37 grams per square meter, and possesses excellent elasticity, light-blocking and anti-seepage properties, and durability.

[0081] 2.2 First PUR hot melt adhesive layer lamination process

[0082] On a PUR laminating machine, using a coating engraving roller with a density of 800-1200 dots / square inch (1200 dots in this example), PUR hot melt adhesive is used to first laminate the warp side of the top layer of black light-absorbing 1 / 4 twill woven fabric to one side of the TPU black film using a coating engraving roller. The amount of PUR adhesive used for the coating is 12±1 g / m². 2 After laminating the roll into a composite, seal the roll and place it in a curing chamber for 48 hours before laminating the next side.

[0083] 3. The lower layer of automotive interior fabric is laminated with the other side of the TPU black film using a composite process.

[0084] 3.1 Selection of Interior Fabrics

[0085] The inner lining fabric is made of gray warp-knitted fabric with a weight of 145 grams per square meter and a thickness of 0.45 mm.

[0086] 3. Second PUR hot melt adhesive layer lamination process

[0087] On a PUR laminating machine, using a coating engraving roller with a density of 800-1200 dots / square inch (1200 dots in this example), PUR hot melt adhesive is used to laminate the back of the customer-selected warp-knitted fabric to the second composite surface of the TPU black film using a coating engraving roller. The amount of PUR adhesive used for coating is 10±1g / m². 2 After the composite roll is sealed and placed in a curing chamber for 48 hours, the next pre-shrinking and sizing process is carried out.

[0088] 4. Pre-shrinking and flattening

[0089] The five-in-one standard heat-insulating and light-blocking composite roller blind fabric, after two layers of lamination, may still have residual internal stress such as tension from the aforementioned processing. Therefore, it needs to undergo a 140-degree x 20-second test at 0.5 kg / cm². 2 The pre-shrinking and stress-relief process of the flatbed ironing machine stabilizes the size and shape, which helps reduce deformation of the roller blind after loading and makes it more reliable.

[0090] 5. After pre-shrinking and flattening, the composite fabric can be cut into pieces, and its appearance and internal quality indicators can be tested. After passing the inspection, it can be shipped to the skylight accessories factory for fine cutting and then assembled into a roller blind.

[0091] 6. Key performance indicators of the sample in this embodiment

[0092] Weight per square meter: 290±3g / m² 2 The warp and weft heat shrinkage is ≤1%, the thickness is 0.68±0.01mm, the light blocking rate is ≥98%, the infrared emissivity is ≥0.85, and other physical properties meet the requirements of the OEM.

[0093] Detection:

[0094] Comparative analysis of performance test data:

[0095] To compare the temperature rise of the composite roller blind fabric prepared in the above embodiments and comparative examples with that of a glass sunroof without composite roller blind fabric, the temperature rise under direct sunlight in summer was simulated. The aforementioned yarn-heating infrared heater was used for irradiation. Partially referring to the test method of national standard GB / T 41560-2022, a heat insulation test chamber was assembled using a foam insulation box and glass. The composite roller blind fabric layer was tested, and a thermocouple was used at a certain distance below to measure the temperature, thus simulating the temperature felt by a person's head inside a car. The thermocouple temperature was recorded after 30 minutes of irradiation. A schematic diagram of the heat insulation test chamber is shown below. Figure 1 The specific results are shown in Tables 2 and 3 below:

[0096] Table 2

[0097]

[0098] Table 3 Comparative data based on tests conducted according to national standard GB / T 41560-2022

[0099]

[0100] The comparative analysis of the above experimental results shows that the six-in-one roller blind fabric in Example 1 has obvious heat insulation, light blocking, radiation cooling effect. It is significantly better than the five-in-one composite roller blind fabric in Example 2, and far superior to the effect of direct sunlight without motorized roller blinds.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A car sunroof roller blind fabric with a six-functional-layer composite structure, characterized in that, The six-functional-layer composite structure consists of, from top to bottom, a rare-earth / graphene radiation cooling fabric layer, a first PUR adhesive layer, a silver reflective coating, a black TPU base film layer, a second PUR adhesive layer, and an interior fabric layer. The rare earth / graphene radiation cooling fabric layer is a woven fabric with a twill weave, consisting of rare earth polyester filaments containing rare earth metal inorganic compound powder as warp and graphene polyester filaments containing graphene as weft. The twill weave is a standard twill weave of any one of 1-down / 3-up, 1-down / 4-up, or 1-down / 5-up. When used in combination, the warp side with more warp threads is the bonding side with the first PUR hot melt adhesive.

2. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The twill weave is a standard 1 / 4 upper twill weave.

3. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The rare earth polyester filament is a polyester-based filament with a lanthanide rare earth inorganic compound micro-nano powder content of more than 1.0%, which absorbs infrared and visible light and converts light energy into heat energy; its filament form is FDY fully drawn multifilament or DTY textured multifilament.

4. The automotive sunroof roller blind fabric according to claim 3, characterized in that: When rare earth polyester filament is DTY textured multifilament, the specification range is 50D-150D, and the multifilament F number is 36F-72F.

5. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The graphene content in the graphene polyester filament is between 0.1% and 0.3%, and the filament morphology is either FDY fully drawn multifilament or DTY textured multifilament.

6. The automotive sunroof roller blind fabric according to claim 5, characterized in that: When the graphene polyester filament is DTY textured multifilament, the specification range is 50D-150D, and the multifilament F number is 36F-144F.

7. The automotive sunroof roller blind fabric according to claim 1, characterized in that: Both the first PUR dispensing layer and the second PUR dispensing layer are dotted PUR adhesive hot melt coatings, with a dot density ranging from 80 to 250 dots / cm², and a coating amount ranging from 8 to 20 grams / cm² when laminating one side.

8. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The black TPU base film layer is made by mixing black light-absorbing microparticles into TPU material, with a basis weight range of 25-45 grams per square meter and a thickness of 0.018-0.035 mm.

9. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The silver reflective coating is a silver PU coating containing reflective aluminum powder coated on the surface of a black TPU base film.

10. The automotive sunroof roller blind fabric according to claim 1, characterized in that: The interior fabric layer can be any one of knitted automotive interior fabric, woven automotive interior fabric, automotive non-woven microfiber leather fabric, or imitation leather automotive interior fabric.

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