Sun-protecting yarn, preparation method thereof, knitted sun-protecting fabric, sun-protecting clothing product and sun-protecting pantyhose

Abstract

The present application relates to the technical field of textile fabric, in particular to a sunscreen yarn, a preparation method thereof, a knitted sunscreen fabric, a preparation method thereof and a sunscreen clothing product. The sunscreen yarn comprises an elastic core yarn and a skin layer, the skin layer comprises a wrapping yarn, the wrapping yarn comprises nano-sized titanium dioxide particles and micron-sized metal oxide two-dimensional sheet layers, and the wrapping yarn is spirally wrapped or parallelly wrapped outside the elastic core yarn to form the skin layer. According to the setting of the yarn structure and components, the bottleneck of the traditional fabric that only thick fabric can provide sunscreen function is broken, a full-waveband double-sunscreen mechanism of 'absorption + reflection' is established in the present application, the different scales of titanium dioxide particles or the two-dimensional sheet structure of metal oxide in the skin layer can realize efficient blocking of UVA and UVB full-waveband. In addition, the sunscreen particles matched with the elastic core yarn can also improve the durability of the sunscreen function.

Description

Technical Field

[0001] This invention relates to the field of textile fabrics, and particularly to a sun-protective yarn and its preparation method, knitted sun-protective fabrics, sun-protective clothing and pantyhose. Background Technology

[0002] As consumers become more aware of UV protection, functional sun-protective knitted fabrics are increasingly used in outdoor clothing, sportswear, and intimate apparel. Currently, most mainstream sun-protective knitted fabrics on the market achieve their sun protection function by adding sun-protective solvents during the dyeing and finishing process or simply mixing sun-protective particles into the fibers. However, these methods suffer from poor sun protection durability, easy washing away of sun-protective agents in finishing processes, and rapid functional degradation.

[0003] The present invention aims to provide a sun-protective yarn, fabric, novel sun-protective knitted product and its preparation process, in order to solve the key problems in the prior art and achieve stable and durable sun protection function. Summary of the Invention

[0004] To address the issues of poor sun protection durability and effectiveness in existing sun protection knitted products, this invention provides a sun protection yarn and its preparation method, a knitted sun protection fabric, sun protection clothing, and sun protection pantyhose.

[0005] The present invention provides a sun-protective yarn, comprising an elastic core yarn and a sheath layer. The sheath layer comprises a covering yarn, which includes nano-sized titanium dioxide particles and micron-sized two-dimensional metal oxide sheets. The nano-sized titanium dioxide particles account for 2%-5% of the total mass of the sheath layer, and the micron-sized two-dimensional metal oxide sheets account for 1%-3.5% of the total mass of the sheath layer. The covering yarn is spirally or parallelly wrapped around the elastic core yarn to form the sheath layer.

[0006] Preferably, the skin layer includes a first covering layer and a second covering layer. The first covering layer includes a first covering yarn having a mixture of nano-sized titanium dioxide particles and polyester. The first covering yarn covers the elastic core yarn to form a composite core. The second covering layer includes a second covering yarn having a mixture of micron-sized two-dimensional metal oxide sheets and polyamide. The second covering yarn covers the composite core to form the sunscreen yarn.

[0007] Preferably, the fineness of the first covering yarn and the second covering yarn is 3D-6D, and / or the fineness of the elastic core yarn is 15D-30D-30D.

[0008] Preferably, the nano-sized titanium dioxide particles have a particle size of 5-80 nm; and / or the lateral dimension of the micron-sized metal oxide two-dimensional sheet is 0.5-5 μm.

[0009] Preferably, the first coated yarn comprises one or a combination of several of nano silver ions, zinc oxide, copper ions, and organosilicon quaternary ammonium salts; and / or the second coated yarn further comprises one or a combination of several of menthol microcapsules, xylitol microcapsules, and zero-degree titanium yarn.

[0010] The present invention also provides a method for preparing sunscreen yarn, as described above. The steps of the method are as follows: polyester and nano-sized titanium dioxide particles are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 250℃-270℃ to obtain fine denier polyester fiber filaments. After stretching and setting, the desired first covering yarn is obtained. Using an elastic core yarn as the core yarn, the first covering yarn is spirally or parallelly wrapped around the elastic core yarn to form a composite core. Polyamide and micron-sized two-dimensional metal oxide sheets are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 260℃-290℃ to obtain fine denier polyamide fiber filaments. After stretching and setting, the desired second covering yarn is obtained. The second covering yarn is spirally or parallelly wrapped around the composite core and then twisted and set to obtain the sunscreen yarn.

[0011] The present invention also provides a knitted sun-protective fabric, comprising a surface layer and a bottom layer made of the sun-protective yarn, wherein the bottom layer is made of abrasion-resistant yarn with a fineness of 15D-30D using a yarn-addition knitting process, and the knitted sun-protective fabric has a weight of 25g / m². 3 -35g / m 3 .

[0012] Preferably, the surface of the knitted sun protection fabric is provided with at least a phosphorescent powder layer, wherein the particle size of the phosphorescent powder layer is 3-15μm; and / or the surface of the knitted sun protection fabric is attached with a hydrated shell layer.

[0013] The present invention also provides a sun protection garment made of the knitted sun protection fabric described above; the sun protection garment includes any one of sun protection pantyhose, sun protection clothing, sun protection arm sleeves, sun protection hats, sun protection face masks, sun protection neck warmers, sun protection yoga wear, and cycling sun protection sets.

[0014] The present invention also provides a sun-protective pantyhose, which is woven from the sun-protective yarn as described in the claims, wherein the weaving density of the sun-protective pantyhose is greater than or equal to 360N / 0.2cm, and the sun-protective pantyhose includes an upper thigh area and a calf area, wherein the weaving density of the upper thigh area is less than the weaving density of the calf area.

[0015] Compared with the prior art, the sun-protective yarn, its preparation method, knitted sun-protective fabric, sun-protective clothing, and sun-protective pantyhose provided by the present invention have the following beneficial effects: 1. This invention provides a sun-protective yarn that specifically protects the elastic core yarn and the outer layer. The outer layer includes a covering yarn, which comprises nano-sized titanium dioxide particles and micron-sized two-dimensional metal oxide sheets. The nano-sized titanium dioxide particles account for 2%-5% of the total mass of the outer layer, and the micron-sized metal oxide sheets account for 1%-3.5% of the total mass of the outer layer, thus protecting the basic yarn structure and components. A dual sun protection mechanism of "absorption + reflection" across the entire wavelength range is established. Utilizing titanium dioxide particles or two-dimensional metal oxide sheets of different sizes in the outer layer, the nano-sized titanium dioxide particles can absorb UVB rays, while the micron-sized metal oxide sheets, due to their planar structure, can effectively reflect UVA rays. The combination of nano-sized titanium dioxide particles and micron-sized metal oxide sheets achieves highly efficient blocking of both UVA and UVB across the entire wavelength range, with ultraviolet protection performance far exceeding that of a single system. Because the sun-protective particles are combined with the elastic core yarn, the durability of the sun protection function is also improved.

[0016] 2. The sunscreen yarn provided by this invention further defines the skin layer as including a first covering layer and a second covering layer, and further defines how the sunscreen yarn specifically forms the corresponding first and second covering layers from the first and second covering yarns. By placing nano-sized titanium dioxide particles in the first covering layer (i.e., the inner layer) and using the second covering layer (i.e., the outer fiber) for isolation, the photocatalytic safety risk caused by direct contact between nano-sized titanium dioxide particles and the skin is fundamentally solved. At the same time, the outer layer's covering effect on the inner layer particles effectively prevents the fabric from turning white due to the exposure of sunscreen particles, maintaining the aesthetic appeal of the "second skin".

[0017] 3. The sun-protective yarn provided by this invention further specifies the yarn fineness parameters. Specifically, the fineness of the covering yarn is specified to be 3D-6D, and the fineness of the elastic core yarn is specified to be 15D-30D. It is evident that the fineness specification achieves the dual functions of "ultra-thin and skin-friendly" and "high-level sun protection." The extremely fine specifications result in a very low fabric weight, providing a lightweight and comfortable wearing experience while ensuring high elasticity, ensuring that the clothing fits the skin without feeling tight.

[0018] 4. The sun-protective yarn provided by this invention further defines the size of the particles and sheets. Specifically, the nano-titanium dioxide particles have a diameter of 5-80 nm, and the transverse dimension of the micron-sized two-dimensional sheets is 0.5-5 μm. By precisely controlling the particle morphology, the absorption and reflection efficiency of ultraviolet rays is improved. In addition, this size design ensures high sun protection performance while reducing the impact of particles on the fiber mechanical properties and improving the smoothness of the yarn surface.

[0019] 5. The sun-protective yarn provided by the present invention is further limited to the addition of antibacterial agents such as nano silver ions, zinc oxide, copper ions, and organosilicon quaternary ammonium salts to the first covering yarn, which can give the fabric good antibacterial properties; menthol microcapsules, zero-degree titanium metal yarn, etc. can also be selectively added to the second covering yarn, so that the second covering layer made based on the second covering yarn has multi-functional properties such as cooling, providing a lasting cooling sensation, and can also inhibit and reduce the generation of odors, meeting the needs of all-weather outdoor sports.

[0020] 6. The sunscreen yarn preparation method provided by this invention adopts a distributed layered coating preparation method, combined with reverse spiral coating and ply setting, which can deeply integrate the sunscreen components with polyester / nylon fibers. This "non-surface adhesion" process ensures excellent washability and sun protection effect. After multiple standard washes, the UPF value of the knitted sunscreen fabric made from the sunscreen yarn is still ≥50, which greatly improves the service life.

[0021] 7. The knitted sun-protective fabric provided by the present invention, wherein the knitted fabric structure and weight control are such that the outer layer is made of the sun-protective yarn, and the inner layer is made of 15D-30D abrasion-resistant yarn for weaving, and the fabric weight is 25-35g / m². 3 Based on specific parameter limitations, extremely lightweight yet high-strength fabrics can be manufactured. Furthermore, the combination of high-strength nylon yarns in the outer and inner layers effectively supports the ultra-thin outer layer, solving the problem of insufficient strength in ultra-thin fabrics and achieving structural stability.

[0022] 8. The knitted sun-protective fabric provided by the present invention features a functional coating, wherein a phosphorescent powder layer and / or an attached hydration shell layer are provided on the surface of the knitted sun-protective fabric. The phosphorescent powder layer enhances safety during outdoor nighttime activities; while the hydration shell layer improves skin-care safety, reduces the risk of skin sensitization and dryness caused by sun exposure, and reinforces the product concept of "sunscreen + skincare".

[0023] 9. The sun protection clothing products provided by this invention can be widely used in sun protection clothing, arm sleeves, yoga wear and other clothing, thereby realizing the market application of "ultra-thin skin-transparent and high-level sun protection integration", breaking the industry bottleneck and prejudice of "thick material for sun protection".

[0024] 10. The sun-protective pantyhose provided by this invention is woven from the provided sun-protective yarn; the weaving density of the sun-protective pantyhose is greater than or equal to 360N / 0.2cm, and the sun-protective pantyhose includes an upper thigh area and a calf area, wherein the weaving density of the upper thigh area is less than that of the calf area. A gradient weaving with a looser weave on the thigh and a denser weave on the calf creates a pressure distribution that is tighter at the bottom and looser at the top, improving the comfort of the wearer. By using the sun-protective yarn provided in the first embodiment above, combined with a specific weaving density limitation, the sun protection performance of the sun-protective pantyhose can be improved while ensuring breathability and comfort in the thigh area, and a comfortable fit without constriction, while the calf area is abrasion-resistant and provides coverage. Therefore, the sun-protective pantyhose provided by this invention combines the advantages of health, comfort, and aesthetics. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of the sunscreen yarn provided in the first embodiment of the present invention.

[0027] Figure 2 yes Figure 1 The diagram shows a cross-sectional structure along the AA direction.

[0028] Figure 3 This is a schematic cross-sectional view of the covering yarn of the skin layer provided by the present invention.

[0029] Figure 4 yes Figure 2 The diagram shows a cross-sectional structure of the sheath of the sunscreen yarn, including a first covering layer and a second covering layer.

[0030] Figure 5A yes Figure 4 The diagram shows a cross-sectional structure of the first covering layer corresponding to the first covering yarn.

[0031] Figure 5B yes Figure 4 The diagram shows a cross-sectional structure of the second covering layer corresponding to the second covering yarn.

[0032] Figure 6 This is a schematic flowchart of the steps in the preparation method of the sunscreen yarn provided in the second embodiment of the present invention.

[0033] Figure 7 This is a structural schematic diagram of the knitted sun protection fabric provided in the third embodiment of the present invention.

[0034] Figure 8 This is a schematic flowchart of the knitted sun-protective fabric preparation method provided in the fourth embodiment of the present invention.

[0035] Figure 9 This is a structural schematic diagram of the sun-protective clothing provided in the fifth embodiment of the present invention.

[0036] Figure 10 This is a schematic diagram of the structure of one side of the sun-protective pantyhose provided in the sixth embodiment of the present invention.

[0037] Explanation of reference numerals in the attached diagram: 10. Sunscreen yarn; 11. Elastic core yarn; 12. Sheet layer; 120. Covering yarn; 121. First covering layer; 122. Second covering layer; 1211. First covering yarn; 1221. Second covering yarn; 101. Nano-sized titanium dioxide particles; 102. Micron-sized two-dimensional metal oxide sheets; 109. Composite core; 20. Knitted sun-protective fabric; 21. Top layer; 22. Bottom layer; 50. Sun protection clothing and accessories; 60. Sun protection pantyhose; 601. Upper thigh area; 602. Lower leg area. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0039] In the embodiments provided by this invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0040] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the invention.

[0041] In various embodiments of the present invention, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process defined by the present invention.

[0042] The flowcharts and block diagrams in the accompanying drawings illustrate methods and possible architectures, functions, and operations according to various embodiments of this application. In this regard, each block in the flowchart or block diagram may represent part of a step. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved.

[0043] Please see Figure 1 and Figure 2 The first embodiment of the present invention is a sunscreen yarn 10, which includes an elastic core yarn 11 and a skin layer 12. The skin layer 12 includes a covering yarn 120, which further includes nano-sized titanium dioxide particles 101 and micron-sized two-dimensional metal oxide sheets 102. The nano-sized titanium dioxide particles 101 account for 2%-5% of the total mass of the skin layer 12, and the micron-sized two-dimensional metal oxide sheets 102 account for 1%-3.5% of the total mass of the skin layer 12. The covering yarn 120 is spirally or parallelly wrapped around the elastic core yarn 11 to form the skin layer 12.

[0044] The coated yarn 120, formed by compounding nano-sized titanium dioxide particles 101 with micron-sized two-dimensional metal oxide sheets 102 as additives, can achieve highly efficient blocking of UVA and UVB across the entire spectrum, with ultraviolet protection performance far exceeding that of a single system. In this embodiment, the combination of sunscreen particles and elastic core yarn in the sunscreen yarn 10 can effectively improve the sun protection performance and durability of sunscreen clothing made from the sunscreen yarn 10.

[0045] In this material, the nano-sized titanium dioxide particles 101 account for 2%-5% of the total mass of the skin layer 12, and the micron-sized two-dimensional metal oxide sheets 102 account for 1%-3.5% of the total mass of the skin layer 12. This specific ratio and combination of proportions enables the material to provide protection across the entire wavelength range. The nano-sized titanium dioxide particles are absorptive, while the micron-sized two-dimensional metal oxide sheets are reflective. Their synergistic action allows the yarn to achieve a high UPF50+ sun protection effect while maintaining an extremely fine yarn density (15D-30D).

[0046] If the proportion of the nano-sized titanium dioxide particles 101 and the micron-sized two-dimensional metal oxide sheets 102 is too high, it will disrupt the continuity of the fine denier fibers (3D-6D), leading to frequent fiber breakage during spinning. If the proportion of the nano-sized titanium dioxide particles 101 and the micron-sized two-dimensional metal oxide sheets 102 is too low, the expected UPF protective effect cannot be achieved. Furthermore, the nano-sized titanium dioxide particles 101 and the micron-sized two-dimensional metal oxide sheets 102 also need to be maintained within the selected percentage range.

[0047] Among them, the UVA band refers to 320nm-400nm, which belongs to long-wave ultraviolet radiation. It has the strongest penetrating power and is the main cause of skin tanning and aging. The UVB band refers to 280nm-320nm, which belongs to medium-wave ultraviolet radiation. It is the main cause of skin sunburn and redness.

[0048] Specifically, the term "spiral wrapping" generally refers to the process of twisting the outer fibers into a spiral shape around the elastic core yarn 11. The twist direction of the elastic core yarn 11 is the basis for understanding the forward and reverse directions: S-twist (left twist): the fibers or plies in the elastic core yarn 11 are inclined in an "S" shape. Z-twist (right twist): the fibers or plies in the elastic core yarn 11 are inclined in a "Z" shape.

[0049] If the above-mentioned "spiral wrapping" is a two-layer wrapping structure, the winding direction of the first layer (inner layer) is usually defined as "forward" (e.g., Z twist), and if the second layer (outer layer) adopts the opposite winding direction (S twist), it is "reverse".

[0050] Furthermore, in some specific embodiments, when the covering yarn 120 is "parallel-wrapped" outside the elastic core yarn 11, the "parallel wrapping" usually refers to parallel spinning, also known as wrap spinning or hollow spindle spinning. Parallel wrapping is a simpler process with higher production efficiency, although the bonding strength between layers is slightly reduced. It is prone to delamination after repeated stretching, making it suitable for sun protection products requiring slight stretching, such as sunscreen masks.

[0051] In this invention, to ensure the softness and elastic recovery rate of the sun-protective fabric, the elastic core yarn 11 is made of any one or more of spandex and polyester elastic fiber (PTT, Polytrimethylene terephthalate), and the fineness of the elastic core yarn is 15D-30D-30D, with an elastic recovery rate ≥95%. The formula for the elastic recovery rate is as follows:

[0052] Parameter explanation: R: Elastic recovery rate (%). The closer the value is to 100%, the better the elasticity and the less likely it is to deform.

[0053] L0: Original length, which is the initial length of the material when no external force is applied.

[0054] L1: Tensile length, which is the length of a material after being subjected to a specified external force (or reaching a specified elongation) and held for a certain period of time.

[0055] L2: Recovery length, which is the length of the material after a certain period of time in a free state after the external force is removed, that is, the degree of recovery after stretching.

[0056] like Figure 3 As shown, in some specific embodiments of the present invention, the covering yarn 120 of the skin layer 12 of the sunscreen yarn 10 may simultaneously contain dispersed nano-sized titanium dioxide particles 101 and micron-sized two-dimensional metal oxide sheets 102, wherein the percentage of the nano-sized titanium dioxide particles 101 in the total mass of the skin layer 12 is greater than the percentage of the micron-sized two-dimensional metal oxide sheets 102 in the total mass of the skin layer 12.

[0057] The nano-sized titanium dioxide particles 101 have a particle size of 5nm-80nm. Further, in some specific embodiments, the particle size of the nano-sized titanium dioxide particles 101 can also be 5nm-20nm, 15nm-60nm, 30nm-80nm, etc., and the particle size can further be 5nm, 10nm, 25nm, 35nm, 40nm, 50nm, 60nm, 75nm, or 80nm, etc. It is understood that in this invention, if the particle size of the nano-sized titanium dioxide particles 101 is greater than 80nm, it will affect the extensibility and elasticity of the sunscreen yarn 10, and will cause the sunscreen yarn 10 to turn white overall, affecting its use. Conversely, if the particle size of the nano-sized titanium dioxide particles 101 is less than 5nm, such as 3nm, it will affect the sun protection effect of the finished product made from the sunscreen yarn 10. Furthermore, the specific range of particle size of the nano-sized titanium dioxide particles 101 allows even ultra-fine denier yarns of 15D-30D to achieve a high sun protection rating of UPF 50+. Due to the specific particle size range, the nano-sized titanium dioxide particles 101 are not simply attached to the surface, but are integrated with the fiber material, thereby improving the stability of the sun protection performance.

[0058] like Figure 3As shown, the lateral dimension of the micron-sized metal oxide two-dimensional sheet 102 is 0.5 μm-5 μm. In some specific embodiments, the lateral dimension of the micron-sized metal oxide two-dimensional sheet 102 can also be 0.5 μm-2 μm, 1.5 μm-3 μm, 2 μm-5 μm, etc., and the lateral dimension of the micron-sized metal oxide two-dimensional sheet 102 can further be 0.5 μm, 1 μm, 1.5 μm, 2 μm, 2.8 μm, 3 μm, 3.6 μm, 4 μm, or 5 μm, etc. In this invention, the lateral dimension of the two-dimensional sheet is defined as 0.5 μm-5 μm, which is larger than the particle size of the micron-sized metal oxide two-dimensional sheet 102. The surface of the two-dimensional sheet can form a micro-reflective surface, which can form a complementary mechanism with the micron-sized metal oxide two-dimensional sheet 102, reducing the risk of photocatalysis. While leveraging the reflective advantages of the two-dimensional sheet, the impact on fiber continuity and strength is reduced.

[0059] When the lateral dimension of the micron-sized metal oxide two-dimensional sheet 102 is larger than a certain range, such as greater than 5μm, the excessively large sheet will block the spinneret or cause fiber breakage when manufacturing 3D-6D fine denier covered yarn, which will seriously affect the smoothness of spinning.

[0060] When the lateral dimension of the micron-scale metal oxide two-dimensional sheet 102 is smaller than a certain range, such as less than 0.5 μm, the sheet will lose its unique advantage of a micro-reflective surface. Meanwhile, if the scale is reduced to the nanometer scale, there will be safety risks associated with nanophotocatalysis, potentially leading to skin sensitization or dryness.

[0061] The lateral dimension refers to the anisotropic structure of the micron-scale metal oxide two-dimensional sheet 102, which has a large specific surface area. Specifically, the metal oxide in the micron-scale metal oxide two-dimensional sheet 102 can be titanium dioxide, zinc oxide, etc. The micron-scale metal oxide two-dimensional sheet 102 refers to a layer structure with an extremely thin atomic thickness, but a large size in the other two dimensions, such as the lateral dimension reaching the micron level. This structure allows the atoms within the micron-scale metal oxide two-dimensional sheet 102 to be tightly connected by strong chemical bonds (such as covalent bonds), while the layers are connected by weak van der Waals forces. This structural characteristic allows them to be separated into single-layer or few-layer sheet structures by methods such as mechanical exfoliation or liquid-phase exfoliation.

[0062] In this embodiment, the addition of nano-sized titanium dioxide particles 101 and micron-sized two-dimensional metal oxide sheets 102 to the covering yarn 120 of the skin layer 12 can optimize the morphology and particle size of the sunscreen ingredients, thereby achieving a better sunscreen effect.

[0063] Furthermore, to simultaneously ensure lightweight properties, the fineness of the yarn in the knitted sun-protective fabric 20 is further limited in this invention to achieve ultra-thin, high-density weaving, thereby giving the fabric a lightweight and skin-friendly characteristic. Specifically, in some embodiments, the fineness of the composite yarn forming the skin layer 12 is 15D-30D. 15D achieves ultra-thin and skin-permeable properties, with a slight decrease in sun protection effect (UPF≈45+), suitable for the ultra-lightweight needs of summer; 30D improves fabric durability, achieving a snag resistance level of 5, while maintaining the same sun protection effect (UPF≥50+), suitable for high-intensity outdoor use.

[0064] Please combine Figure 4 , Figure 5A ,as well as Figure 5B As shown, the skin layer 12 includes a first covering layer 121 and a second covering layer 122. The first covering layer 121 includes a first covering yarn 1211 having a mixture of nano-sized titanium dioxide particles 101 and polyester. The first covering yarn 1211 covers the elastic core yarn 11 to form a composite core 109.

[0065] The first coating layer 121 is the inner layer, which uses nano-sized titanium dioxide particles 101 to achieve efficient UVB absorption. The second coating layer 122 is the outer layer, which uses micron-sized two-dimensional metal oxide sheets 102. Since the metal oxides in the micron-sized two-dimensional metal oxide sheets 102 are relatively stable, there is no risk of nano-photocatalysis. Through the double coating of the first coating layer 121 and the second coating layer 122, the nano-sized titanium dioxide particles 101 contained in the first coating layer 121 can be effectively prevented from directly contacting the skin. This solves the skin safety risk of photocatalysis of nano-titanium dioxide from the root cause, and also prevents the nano-sized titanium dioxide particles 101 from being exposed, causing the fabric to turn white, or the fabric use to cause skin sensitization and dryness, thus avoiding the skin safety risks associated with skin contact.

[0066] like Figure 4 As shown, by using the combined effect of the first covering layer 121 and the second covering layer 122 provided in this embodiment, the fabric obtained by weaving the sun-protective yarn 10 as defined in this embodiment can be free from whitening, have good skin permeability, and maintain a beautiful "second skin" effect.

[0067] It is understood that the first covered yarn 1211 is formed into a yarn with a specific fineness by spinning a mixture of nano-sized titanium dioxide particles 101 and polyester. Specifically, the nano-sized titanium dioxide particles 101 and the polyester mixture are spun into 5D fine denier polyester fibers using a melt spinning machine. Specifically, polyester chips and 10-50nm nano TiO2 are mixed at a mass ratio of (92-95):(5-8), 0.1% antioxidant is added, and the mixture is melt-blended at 260-270℃ and spun into 5D fine denier polyester fibers using a melt spinning machine. After further pre-stretching at 80℃-100℃ and heat-setting at 110℃-130℃, the inner skin layer UVB absorbing fiber is obtained. In some other embodiments, the first covered yarn 1211 is also spun using a sol-gel method, in which the nano-sized titanium dioxide particles 101 are sol-coated onto the surface of the elastic core yarn 11 to form the first covering layer 121. The UVA absorption range is 320nm-400nm, and the UVB absorption range is 280nm-320nm.

[0068] The second coating layer 122 comprises a second coating yarn 1221 having a mixture of a micron-sized two-dimensional sheet of metal oxide 102 and a polyamide. Specifically, the polyamide mixture, wherein in some embodiments the polyamide is specifically nylon-66 fiber (also known as nylon) chips and the two-dimensional sheet at a mass ratio of (94-97):(3-6), with the addition of 0.1% lubricant, is melt-blended at 270°C-280°C, and spun into 5D fine denier nylon fiber filaments using a melt spinning machine. After pre-stretching at 60°C-80°C and heat-setting at 100°C-130°C, the outer sheath UVA reflective fiber is obtained. The lubricant may be any one or a combination of several of the following: titanate coupling agents, aluminate coupling agents, silane coupling agents, zinc stearate / calcium stearate, and silicone oil or silicone resin powder.

[0069] Furthermore, continue to combine Figure 4 as well as Figure 5B As shown, the second covering yarn 1221 covers the composite core 109 to form the sunscreen yarn 10. In some specific steps of the present invention, the process of forming the second covering layer 122 on the composite core 109, relative to the secondary covering and plying of the elastic core yarn 11, includes the following specific steps: Using the composite core 109 as the core, and 5D nylon sunscreen fiber as the outer covering yarn, the yarn is wrapped again in a reverse spiral using a high-speed wrapping machine (wrapping twist 700-900 twists / meter). After plying, it is heat-set at 100℃ for 5 minutes to obtain a finished 15D-30D double-shell core structure composite yarn. This yarn achieves a three-layer synergistic structure of "elastic core layer + UVB absorption layer + UVA reflection layer".

[0070] like Figure 5A As shown, the first covering yarn 1211 includes any one or a combination of several of nano silver ions, zinc oxide, copper ions, and organosilicon quaternary ammonium salts; nano silver ions and copper ions can destroy the cell wall and DNA of bacteria, and have a strong killing effect on common pathogenic bacteria such as Escherichia coli and Staphylococcus aureus, inhibiting the odor produced by bacteria decomposing sweat from the source, and playing a role in deodorization.

[0071] The antibacterial agent is not merely adhered to the fabric surface, but is physically encapsulated or tightly bound within the sun-protective yarn 10. This structure makes the antibacterial agent less prone to detachment during washing, increasing its wash resistance, and avoiding potential skin irritation from direct skin contact, thus improving safety and achieving long-lasting "built-in" protection. Furthermore, the synergistic effect of different antibacterial mechanisms can be utilized to further enhance antibacterial efficiency and delay the development of bacterial resistance.

[0072] The second covering yarn 1221 further includes one or a combination of menthol microcapsules, xylitol microcapsules, and zero-degree titanium yarn. The menthol and xylitol microcapsules are released through friction or body temperature. Menthol stimulates cold receptors in the skin, producing a cooling sensation; xylitol absorbs heat from the body surface using its heat-absorbing properties, also providing a cooling sensation. The zero-degree titanium yarn has an extremely high thermal conductivity, acting like a heat sink to rapidly conduct body heat to the outside world upon skin contact, producing a significant "cooling sensation upon contact" and solving the problem of stuffiness. The selection of different materials can meet specific product design needs, thereby improving the user experience.

[0073] Furthermore, in some specific embodiments of the present invention, the fineness of the first covering yarn 1211 and the second covering yarn 1221 is 3D-6D. In this document, the fineness unit for all fibers is expressed as D, which stands for Denier. The fineness range of 3D-6D indicates that both the first covering layer 121 and the second covering layer 122 are made of extremely fine fibers, belonging to the category of microfiber or fine denier fibers. For example, a fineness of 3D means that 9000 meters of this fiber weighs 3 grams, and a fineness of 6D means that 9000 meters of this fiber weighs 6 grams. The choice of fineness balances both fiber weaving and sun protection effects; values ​​greater than or less than this range will disrupt the balance. It can be understood that the fineness selection of the first covering yarn 1211 and the second covering yarn 1221 is related to the particle size of the aforementioned nano-sized titanium dioxide particles 101 and the lateral dimensions of the micron-sized two-dimensional sheet 102. It is necessary to meet the sun protection performance of the sun protection yarn 211 while improving the comfort of the sun protection yarn 211.

[0074] Furthermore, in order to achieve a higher effect of reflecting and blocking ultraviolet rays, titanium dioxide matting agent is added to the first coating layer 121 to further form a corresponding protective barrier.

[0075] In this embodiment, by adding titanium dioxide with optimized morphology and particle size to the skin layer 12, the outer layer adopts a two-dimensional sheet 102 of micron-sized metal oxide, which fully considers reflection or scattering to achieve UVA blocking without the photocatalytic risk of nano-sized particles; the inner layer adopts 10-50nm nano-sized titanium dioxide particles 101 to achieve efficient UVB absorption. The skin layer 12, through its encapsulation design, avoids direct contact between nano-sized titanium dioxide particles 101 and the skin, thus balancing sun protection efficiency and safety of use.

[0076] Please see Figure 6 The second embodiment of the present invention provides a method for preparing sunscreen yarn, which can be used to prepare the sunscreen yarn as described in claim 1, specifically, it may include the following steps: Step S1: Polyester and nano-sized titanium dioxide particles are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 250℃-270℃ to obtain fine denier polyester fiber filaments. After stretching and shaping, the desired first covered yarn is obtained. Step S2: Using the elastic core yarn as the core yarn, the first covering yarn is spirally or parallelly wrapped around the elastic core yarn to form a composite core. Step S3: Polyamide and micron-sized two-dimensional metal oxide sheets are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 260℃-290℃ to obtain fine denier polyamide fibers. After stretching and setting, the desired second covered yarn is obtained; and Step S4: The second covering yarn is wrapped around the composite core body in a reverse spiral or in parallel, and then twisted and shaped to obtain the sun protection yarn.

[0077] Specifically, in some specific implementation methods, combined with Figure 4 As shown, in the above steps, the sunscreen yarn can be obtained by using an elastic core yarn 11 as the core layer, forming a double core-sheath structure with the inner and outer sheath layers. The elastic core yarn 11 serves as the supporting substrate, using 15D-30D-30D spandex fiber to provide the yarn's elastic recovery.

[0078] The first coating layer 121 serves as the inner skin layer, wrapping around the outer side of the core layer. It is composed of a polyester fiber substrate and nano-sized titanium dioxide particles 101. The nano-sized titanium dioxide particles have a particle size of 10-50 nm and account for 5%-8% of the mass of the inner skin layer. The nano-sized titanium dioxide particles 101 account for 2%-5% of the total mass of the skin layer. The first coating layer 121 mainly plays a basic sun protection role by absorbing UVB ultraviolet rays. The selection of the particle size of the nano-sized titanium dioxide particles 101 is related to that shown in the first embodiment above, and will not be repeated here.

[0079] The second coating layer 122 serves as the outer skin layer, wrapping around the outer side of the inner skin layer. It is composed of a nylon fiber substrate and a micron-sized titanium dioxide two-dimensional sheet 102. The micron-sized titanium dioxide two-dimensional sheet 102 has a lateral dimension of 1-3 μm, an atomic thickness, and accounts for 3%-6% of the mass of the outer skin layer. The micron-sized titanium dioxide two-dimensional sheet 102 accounts for 1%-3.5% of the total mass of the skin layer. It can block UVA band ultraviolet rays through reflection and scattering, forming full-band protection. The lateral dimension of the micron-sized titanium dioxide two-dimensional sheet 102 is related to that shown in the first embodiment above, and will not be repeated here.

[0080] The elastic core yarn 11 is made of spandex fiber with a fineness of 15D-30D and an elastic recovery rate of ≥95%. The elastic core yarn 11 provides both yarn elasticity and fabric support. The use of fine denier spandex in the elastic core yarn 11 ensures the overall yarn is ultra-thin; the high elastic recovery rate allows the fabric to quickly rebound after stretching, maintaining its sun-protective structure.

[0081] The first coating layer 121 is an inner skin layer, equivalent to a UVB absorption layer. Specifically, the first coating layer 121 may include polyester fiber (PET) spinning grade, formed by adding nano-sized titanium dioxide particles with a particle size of 10-50 nm at a melting point of 255℃-260℃ to create a mixture. The specific steps of polyester fiber spinning corresponding to the first coating layer 121 are as follows: Polyester chips are mixed with 10nm-50nm nano-sized titanium dioxide particles at a mass ratio of (92-95):(5-8), and 0.1% antioxidant is added. The mixture is melt-blended at 260℃-270℃ and spun into 5D fine denier polyester filaments by melt spinning machine. After pre-stretching at 70℃-90℃ and heat setting at 110℃-130℃, the first coating layer 121 is obtained to absorb UVB band light.

[0082] Furthermore, the core layer is covered with spandex: 15D-30D spandex fiber is used as the core yarn, and the above-mentioned 5D polyester sun protection fiber is used as the covering yarn. The core is spirally covered by a high-speed covering machine (covering twist 800-1000 twists / meter) to obtain a composite core of "spandex core layer + polyester inner skin layer". The second coating layer 122 is the outer skin layer, which is equivalent to the UVA reflection blocking layer. The nylon fiber (PA66) is made of spinning-grade nylon chips with a melting point of 265℃-270℃. It is mixed with micron-sized metal oxide two-dimensional sheets 102 with a transverse size of 0.5μm-5μm.

[0083] Using a composite core as the core and 5D nylon sunscreen fiber as the outer covering yarn, the yarn is then spirally wrapped again using a high-speed wrapping machine (wrapping twist 700-900 twists / meter). After plying, the yarn is heat-set at 100℃ for 5 minutes to obtain a finished 15D-30D double-shell core structure composite yarn. This yarn achieves a three-layer synergistic structure of "elastic core layer + UVB absorption layer + UVA reflection layer".

[0084] In this embodiment, the core of the invention is the preparation of a double-core-sheath composite yarn. A step-by-step spinning and coating process of "inner sheath spinning → core coating → outer sheath spinning → secondary coating" is adopted to achieve precise distribution of components in each layer and avoid cross-mixing of sunscreen particles.

[0085] Please see Figure 8 The fourth embodiment of the present invention provides a knitted sun protection fabric 20, which includes a surface layer 21 and a bottom layer 22 made of sun protection yarn 10 provided in the first embodiment and sun protection yarn 10 made based on the sun protection yarn preparation method provided in the second embodiment. The bottom layer 22 is made of abrasion-resistant yarn with a fineness of 15D-30D using a yarn-adding knitting process. The weight of the knitted sun protection fabric is 25g / m². 3 -35g / m 3 .

[0086] Specifically, the abrasion-resistant yarn may include nylon yarn or polyester yarn, or other high-strength abrasion-resistant yarn, and should have certain light resistance and abrasion resistance.

[0087] Specifically, in some implementation schemes, 15D-30D double-core composite yarn is used as the main body, and 15D-30D high-strength low-elasticity nylon covering yarn is used as the filler yarn, with the fabric weight controlled at 30-35g / ㎡, to achieve an ultra-thin and skin-transparent effect of 15D-30D.

[0088] Specifically, the surface layer 21 of the knitted sun protection fabric 20 is provided with at least a phosphorescent powder layer (not shown in the figure), wherein the particle size of the phosphorescent powder layer is 3-15μm.

[0089] The surface layer 21 of the knitted sunscreen fabric 20 may also be attached to a hydration shell (not shown). The hydration shell, also known as the ectoin layer, mainly consists of tetrahydromethylpyrimidine carboxylic acid. The hydration shell can adhere to the fiber surface and has both anti-photoaging and skin-soothing effects, making it suitable for sensitive skin and mature skin.

[0090] In the knitted sun-protective fabric provided in this embodiment, the sun-protective components are deeply integrated with the core fibers, rather than being merely surface-attached. After 20 standard washes, the UPF (Ultraviolet Protection Factor) value remains greater than 50. UPF, or Ultraviolet Protection Factor, specifically refers to the ratio of the average effective ultraviolet radiation (UVR) that transmits and reaches the air without the sample, calculated to the average effective UVR that transmits and reaches the fabric. Furthermore, the knitted sun-protective fabric employs a high-density weave and an elastic core yarn design, ensuring that even after the fabric is stretched by 50%, the fiber gaps still effectively block ultraviolet rays, and the sun-protective effect does not significantly decrease.

[0091] Please see Figure 8 The fourth embodiment of the present invention provides a method for preparing a knitted sun-protective fabric, specifically comprising the following steps: Step T1: At least four sun-protective yarns are threaded into the loom's yarn guide, and a plain weave and anti-fraying rib knit are used to create the surface layer. Abrasion-resistant yarns are introduced into the abrasion-resistant areas of the surface layer using a yarn-adding weaving technique. The transverse weaving density of the surface layer is greater than or equal to 360N / 0.2cm, where N represents the number of loop rows per unit length; the loom is operated at a speed of 500 revolutions per second or higher.

[0092] Step T2: Introduce at least one spandex core-spun yarn through an interlacing process to create a mesh structure bottom layer; Step T3: After continuous knitting, the knitted sun-protective fabric blank is vacuum-treated to stabilize the elasticity of the spandex and sun-protective yarns. After obtaining the knitted sun-protective fabric blank, it is then pre-shaped. Step T4 involves dyeing, fixing, softening, and setting the pre-shaped knitted sun protection fabric to obtain the desired knitted sun protection fabric.

[0093] Specifically, for knitted fabrics, knit density includes transverse density, longitudinal knit density, and total density (i.e., areal density). Longitudinal knit density is the number of rows of loops per unit length along the longitudinal direction of the loops; transverse density is the number of rows of loops per unit length along the longitudinal direction of the loops; and areal density is the total number of loops per unit area. In this embodiment, transverse knit density is used to evaluate knit density.

[0094] Specifically, in step T1 above, the calculation formula related to the transverse weave density includes: Surface density = longitudinal weave density × transverse weave density.

[0095] In some preferred embodiments, the transverse knitting density is greater than 400N / 0.2cm, or further, the transverse knitting density is greater than or equal to 480N / 0.2cm and less than 680N / 0.2cm. Specifically, a transverse knitting density of 480N / 0.2cm means that there are 480 knitting loops (N=Number, number of loops) within a 0.2cm length; this transverse knitting density represents an extremely high-density knitted fabric specification.

[0096] In the preparation method of the knitted sun protection fabric provided in this embodiment, the fabric is woven using a computerized flat knitting machine, incorporating anti-unraveling structure throughout the process to achieve a high-density, ultra-thin, and anti-snagging knitting effect.

[0097] In some specific embodiments, step T1 specifically includes: using a 72-needle computerized flat knitting machine, knitting width of 160cm, horizontal knitting density of 480N / 0.2cm, 55 rows / 10cm, using plain knitting basic structure, and incorporating anti-runaway rib structure throughout (3cm at the edge). In step T2 above, 15D-30D high-strength low-elasticity nylon covering yarn is introduced into the bottom layer of the fabric. The yarn-adding weaving process is used to make the wear-resistant covering yarn form a tight mesh bottom layer inside the fabric. The surface layer is a double-core sun protection yarn, which not only ensures the lightness, sun protection and soft feel of the surface layer, but also strengthens the wear resistance and anti-snagging performance of the bottom layer. Furthermore, in step T2 above, the high-strength, low-elasticity nylon-coated yarn in the abrasion-resistant layer of the yarn-adding structure has a fineness of 15D-30D and a breaking strength ≥5cN / dtex. The yarn-adding structure effectively improves the fabric's anti-snagging and anti-unraveling properties. The fine denier specification defined in this embodiment does not increase the fabric thickness. The knitted sun-protective fabric 20 prepared using the above method has a reinforced fabric underlayer with high breaking strength, thus effectively preventing snagging and breakage.

[0098] In step T3 above, continuous knitting is performed according to the above parameters. After the knitting is completed, the fabric is unloaded to obtain the knitted sun-protective fabric blank. Here, unloading refers to the process of removing the completed fabric from the loom and preparing it for the weaving of the next piece of fabric.

[0099] Furthermore, in step T3, the pre-shaped shape facilitates ensuring the dimensional shrinkage limit of the knitted sun protection fabric blank and removing surface oil.

[0100] Specifically, when the knitted sun protection fabric blank is a tubular fabric, the weave markings on the tubular fabric need to be removed during the pre-forming process in step T3.

[0101] In step T4 above, dyeing and finishing auxiliaries, high-temperature disperse dyes, leveling agents, softeners, etc., are used. The processing temperature of the dyeing and finishing auxiliaries is a high temperature greater than 140°C, and the high-temperature dyes are suitable for dyeing polyester / nylon blended fabrics; the leveling agent added in step T4 above ensures uniform color and solves the problem of whitening.

[0102] The dyeing and finishing auxiliaries include dispersants, high-temperature carriers / dyeing accelerators, and pH adjusters / buffers. Specifically, the dispersants include sodium lignosulfonate, naphthalenesulfonic acid formaldehyde condensate, polycarboxylate, etc., the high-temperature carriers / dyeing accelerators include o-phenylphenol, p-phenylphenol, etc., and the pH adjusters / buffers include acetic acid, sodium acetate, ammonium dihydrogen phosphate, etc.

[0103] The leveling agents include fiber-friendly leveling agents, dye-friendly leveling agents, and high-temperature leveling agents. Specifically, they include cationic surfactants, nonionic / anionic surfactants, and high-temperature leveling agents.

[0104] The softener includes silicone softeners, cationic softeners, nonionic softeners, and special functional softeners.

[0105] Furthermore, in some specific embodiments, due to the multi-material blended nature of the knitted sunscreen fabric 20 with its double-core structure, a high-temperature, long-time dyeing and finishing process is used to ensure full dye penetration, thus solving the problem of whitening caused by using titanium dioxide alone. Simultaneously, a softening finish is applied to improve wearing comfort. Specific steps include: Pretreatment: Immerse the fabric blank in a degreasing agent solution (concentration 1%-2%) at 40℃ for 8-15 minutes to remove oil stains from the weaving process. Rinse with clean water and dry to ensure uniform dyeing. High-temperature long-time dyeing: Place the pretreated fabric into a high-temperature and high-pressure dyeing machine, add high-temperature resistant disperse dye (concentration 2%-3%) and leveling agent (concentration 0.5-1%), raise the temperature to 130-140℃, and keep it at the temperature for 60-90 minutes (conventional dyeing is 20-40 minutes), so that the dye can fully penetrate into the interior of polyester and nylon fibers and cover a small number of exposed titanium dioxide particles on the fiber surface; Reduction cleaning and color fixing: After dyeing, cool to 70℃-90℃, add reduction cleaning agent (concentration 1%-2%) and clean for 20 minutes to remove floating color; then add color fixing agent (concentration 0.6%-1%) and fix at 60℃-70℃ for 10-30 minutes to improve color fastness; Softening and finishing: After color fixing, the fabric is immersed in a softener solution (organosilicon, concentration 1%-3%) and padded (padded rate 65%-75%). After pre-drying at 70℃-90℃, it is stretched and set at 110℃-130℃ (width deviation ±1cm). At the same time, it is pre-shrinked (pre-shrinkage rate 3%-5%) to obtain the finished knitted sun protection fabric.

[0106] To expand the diversity of fabrics, high-temperature long-time dyeing and finishing can be replaced with low-temperature carrier dyeing and finishing (80℃-90℃), which consumes less energy, is gentler in process, has slightly lower dye penetration, and the fabric is slightly whitish, making it suitable for light-colored sun protection fabrics, such as white, beige and other light colors.

[0107] In step T4 of the above-mentioned method for preparing knitted sun-protective fabric, an ectoin finishing agent, namely tetrahydromethylpyrimidine carboxylic acid, is added during the dyeing and finishing of the fabric. The concentration of tetrahydromethylpyrimidine carboxylic acid added is 0.5%-2%. Tetrahydromethylpyrimidine carboxylic acid can adhere to the fiber surface and has both anti-photoaging and skin-soothing effects, making it suitable for sensitive skin and mature skin.

[0108] In the method for preparing the knitted sunscreen fabric claimed in this embodiment, the combination of ultra-thin high-density and anti-runaway structure and yarn-filling structure is utilized. At the same time, fine denier double-core composite yarn is used for high-density weaving to ensure that it is light and skin-permeable while preventing ultraviolet rays from penetrating after stretching. Anti-runaway structure is integrated throughout the weaving process, and wear-resistant high-strength covering yarn is introduced to form a tight bottom layer, which greatly improves the fabric's anti-snagging and anti-runaway properties and solves the problem of easy damage to ultra-thin fabrics. Throughout the entire weaving process, anti-fraying structures are incorporated, high-density weaving is used, and the yarn-adding structure is activated to introduce an additional abrasion-resistant, high-strength covering yarn, which forms a tight bottom layer inside the fabric, thereby thickening and strengthening the area.

[0109] Furthermore, in this embodiment, a high-temperature dyeing and finishing process (130-140℃) is adopted and the dyeing time is extended to allow the dye to fully penetrate into the fiber interior, cover the small amount of exposed titanium dioxide particles on the fiber surface, solve the problem of fabric whitening, and ensure skin permeability and color saturation.

[0110] The knitted sun-protective fabric of this invention uses 15D-30D double-core composite yarn as the core raw material. It is prepared through a standardized process of yarn preparation → fabric weaving → dyeing and finishing → finished product inspection, achieving an ultra-thin 15D-30D fabric with UPF50. + Its core features include high sun protection, safe and washable properties, and resistance to snagging and fraying.

[0111] Please see Figure 9 The fifth embodiment of the present invention provides a sun protection clothing item 50, which is made of the knitted sun protection fabric 20 provided in the third embodiment above; the sun protection clothing item 50 includes any one of sun protection pantyhose, sun protection clothing, sun protection arm sleeves, sun protection hats, sun protection face masks, sun protection scarves, sun protection yoga clothes or cycling sun protection sets.

[0112] It is understood that the sun-protective clothing provided in the fourth embodiment of the present invention has related beneficial effects with the knitted sun-protective fabric 20 provided in the third embodiment of the present invention and the sun-protective yarn 10 provided in the first embodiment of the present invention, which will not be elaborated here. In addition, the sun-protective clothing 50 made from the knitted sun-protective fabric 20 provided in the third embodiment also has the following effects: The knitted sun protection fabric 20 provided in the third embodiment is suitable for skin-friendly sun protection products such as 15D-30D ultra-thin sun protection pantyhose, sun protection clothing, sun protection arm sleeves, sun protection face masks, sun protection neck warmers, and lightweight knitted sun protection skirts. It is a mainstream category of outdoor sun protection in summer, with a large market demand and a wide audience. Furthermore, due to the product characteristics of the knitted sun protection fabric 20 and its special surface properties, it is possible to develop niche products such as those for sensitive skin, mother and baby, medical antibacterial, and outdoor professional. It is also possible to develop cross-border products that combine sun protection with fashion and sun protection with sports, such as ultra-thin sun protection knitted cardigans, sun protection yoga wear, and cycling sun protection sets, thereby expanding product application scenarios and enhancing brand competitiveness. It is evident that the dual-core structure sunscreen yarn 10 and the ultra-thin, high-density, anti-loosening knitting process of the present invention can be extended to other knitted products such as knitted underwear, stockings, and lightweight scarves, thereby upgrading the sunscreen function of these products, enriching the product portfolio, and expanding the company's market coverage.

[0113] The technical solution of this invention not only solves the core technical defects of existing knitted sun protection fabrics, but also promotes the upgrading of yarn structure, optimization of sun protection mechanism and improvement of process level in the knitted sun protection fabric industry, providing a new technical direction for the research and development of functional knitted fabrics; at the same time, the product accurately matches the high-end core needs of the market, has significant functional advantages and market selling points, can effectively improve the added value of textile products, create good economic benefits for enterprises, and has technical value, market value and industry value.

[0114] Please see Figure 10 The fifth embodiment of the present invention provides a sun-protective pantyhose 60, which is woven from the sun-protective yarn 10 provided in the first embodiment above; the weaving density of the sun-protective pantyhose 60 is greater than or equal to 360N / 0.2cm.

[0115] like Figure 10 As shown, the sun-protective pantyhose 60 includes an upper thigh region 601 and a calf region 602, wherein the knitting density of the upper thigh region 601 is less than that of the calf region 602.

[0116] It is understood that in this embodiment, the weaving density of the upper thigh region 601 and the lower leg region 602 is inconsistent, employing a gradient weaving with a looser weave on the thigh and a denser weave on the lower leg to create a pressure distribution that is tighter at the bottom and looser at the top, thus improving the comfort of the wearer. Using the sun-protective yarn 10 provided in the first embodiment, combined with a specific weaving density limit, the sun-protective performance of the sun-protective pantyhose 60 can be improved while ensuring that the thigh area is breathable, non-suffocating, and fits snugly without constriction; while the lower leg area is abrasion-resistant and provides coverage. Therefore, the sun-protective pantyhose 60 provided in this embodiment can balance health, comfort, and aesthetics, enhancing the wearing experience.

[0117] Specifically, the knitting density of the upper thigh region 601 is 360N / 0.2cm-400N / 0.2cm. The knitting density of the calf region 602 is 400N / 0.2cm-480N / 0.2cm. The different knitting densities in different areas of the sun-protective pantyhose 60 better suit the comfort of specific users and the aesthetic appearance of the product.

[0118] The manufacturing process of the sun-protective pantyhose 60 is as follows: In some specific embodiments, the sun-protective pantyhose 60 is knitted into a three-dimensional shape that fits the foot using a small circular knitting machine (also known as a single-cylinder circular sock machine). The small circular knitting machine can automatically switch knitting modes according to different parts of the sock (such as the sock cuff, heel, and toe).

[0119] Yarn threading on the loom: Two sun-protective yarns 10 are used to maintain the elasticity of the sock body, and four nylon yarns are threaded into the yarn guide of the loom. The density and weave structure are set. The knitting density of the sun-protective pantyhose 60 is 480N / 0.2cm.

[0120] Knitting and shaping: The knitting machine operates at 600-800 rpm, and the loop density is adjusted from top to bottom, gradually increasing to form the sock body. The crotch and toe areas are reinforced with additional yarn increases and decreases.

[0121] Vacuuming: High pressure stabilizes the elasticity of spandex and sun-protective yarns, removing weave marks from the tubular fabric.

[0122] Pre-order type: Ensure the sock size and remove oil stains from the surface of the sock.

[0123] Waistband and trousers: Position the waist and sew with a three-needle, five-thread sewing machine.

[0124] Sock toe sewing: Turn the sock inside out, sew the toe with the sewing machine, and simultaneously cut off any excess material.

[0125] Pretreatment: The sock blanks are placed in an industrial dyeing vat, and detergent is added and boiled at 90-95℃ to remove oil and impurities and improve the dyeing rate.

[0126] High-temperature dyeing: Use reactive dyes, keep the temperature at 90-98℃, and dye in a circulating manner; add leveling agent and fixing agent to prevent color spots and fading.

[0127] Washing and color fixing: Cold water → warm water → soaping → color fixing → multiple rinses with clean water to remove floating color and additives.

[0128] Dehydration and drying: centrifugal dehydration, hot air drying at 80-100℃ to avoid fiber damage.

[0129] Sizing: Dry the pantyhose and insert it into the shaping board (precisely shaped according to size), stretch it to the standard size.

[0130] Steam setting: The fiber is fed into a setting machine and treated with saturated steam at 120-140℃ for 5-10 seconds to crystallize the fiber and shape it.

[0131] Automatic plate removal: The stockings automatically remove the plate, returning them to their natural state, ensuring stable size and no wrinkles.

[0132] To further evaluate the performance of the knitted sun protection fabric, thereby assessing the technical effectiveness of the sun protection yarn and corresponding sun protection clothing.

[0133] Experimental Example 1 Preparation process of 20D double core-sheath composite yarn Inner layer polyester fiber spinning: Polyester chips are mixed with 10-50nm nano titanium dioxide particles at a mass ratio of 95:5, and 0.1% antioxidant 5057 (IRGANOX 5057) is added. The mixture is melt-blended at 260℃ and spun into 5D fine denier polyester fiber filaments by melt spinning machine. After pre-stretching at 80℃ and heat setting at 120℃, the inner layer UVB absorbing fiber is obtained; the nano titanium dioxide particles have a particle size of 30nm.

[0134] Spandex core layer coating: 20D spandex fiber is used as the core yarn, and the above-mentioned 5D polyester sun protection fiber is used as the first coating yarn. The yarn is spirally coated by a high-speed coating machine (coating twist 800 twists / meter) to obtain a primary core-sheath yarn with "spandex core layer + polyester inner sheath layer". Outer sheath nylon fiber spinning: Nylon-66 chips and two-dimensional sheet titanium dioxide particles are mixed at a mass ratio of 94:6, and 0.1% lubricant isooctyl stearate is added. The mixture is melt-blended at 270-280℃ and spun into 5D fine denier nylon fibers by melt spinning machine. After pre-stretching at 70℃ and heat setting at 110℃, the outer sheath UVA reflective fiber is obtained; the transverse dimension of the micron-sized metal oxide two-dimensional sheet is 2μm.

[0135] The total mass of the skin layer is the sum of the masses of the inner and outer skin layers. In Experimental Example 1, the nano-titanium dioxide particles account for 2.5% of the total mass of the skin layer, and the micron-sized two-dimensional metal oxide sheets account for 3% of the total mass of the skin layer.

[0136] Secondary wrapping and ply setting: The primary core yarn is used as the core, and 5D nylon sunscreen fiber is used as the outer wrapping yarn. It is then wrapped again in a reverse spiral by a high-speed wrapping machine (wrapping twist 700-900 twists / meter). After plying, it is heat-set at 100℃ for 5 minutes to obtain the finished 20D double core-sheath composite yarn. This yarn achieves a three-layer synergistic structure of "elastic core layer + UVB absorption layer + UVA reflection layer".

[0137] Knitting process of sun protection fabric The main body is made of 20D double-core composite yarn, supplemented with 20D high-strength, low-elasticity nylon covered yarn. It is woven using a computerized flat knitting machine, incorporating anti-fraying structures throughout the process to achieve a high-density, ultra-thin, and snag-resistant weaving effect. Specific process parameters and steps are as follows: Equipment and process parameters: A 72-needle computerized flat knitting machine is used, with a knitting width of 160cm and a knitting density of 480N / 0.2cm. Plain knitting is used as the basic structure, and anti-runaway rib knitting is incorporated throughout the process (3cm at the edge). Adding yarn structure introduction: 20D high-strength low-elasticity nylon covering yarn is introduced into the bottom layer of the fabric. The adding yarn weaving process is used to make the wear-resistant covering yarn form a tight mesh bottom layer inside the fabric. The surface layer is a double-core sun protection yarn, which not only ensures the lightness, sun protection and soft feel of the surface layer, but also strengthens the wear resistance and anti-snagging performance of the bottom layer. Knitting and shaping: Knit continuously according to the above parameters. After knitting is completed, the fabric is unwound to obtain the knitted sun protection fabric blank. The fabric weight is controlled at 30-35g / m². 2 .

[0138] The desired knitted sun protection fabric is obtained by dyeing, finishing, softening and shaping the raw knitted sun protection fabric.

[0139] The corresponding knitted sun protection fabric is flat.

[0140] Experimental Example 2: The only difference between it and Experimental Example 1 is that the nano-titanium dioxide particles account for 5% of the total mass of the skin layer, and the micron-sized metal oxide two-dimensional sheets account for 1% of the total mass of the skin layer.

[0141] Experimental Example 3: The only difference between it and Experimental Example 1 is that the nano-titanium dioxide particles account for 3% of the total mass of the skin layer, and the micron-sized two-dimensional metal oxide sheets account for 3% of the total mass of the skin layer.

[0142] Experimental Example 4: The only difference between it and Experimental Example 1 is that the nano-titanium dioxide particles account for 2% of the total mass of the skin layer, and the micron-sized metal oxide two-dimensional sheets account for 1% of the total mass of the skin layer.

[0143] Experimental Example 5: The only difference between it and Experimental Example 1 is that the particle size of the nano-titanium dioxide particles is 80 nm.

[0144] Experimental Example 6: The only difference between it and Experimental Example 1 is that the particle size of the nano-titanium dioxide particles is 5 nm.

[0145] Experimental Example 7: Its only difference from Experimental Example 1 is that the lateral dimension of the micron-scale metal oxide two-dimensional sheet is 0.5 μm.

[0146] Experimental Example 8: The only difference between it and Experimental Example 1 is that the lateral dimension of the micron-scale metal oxide two-dimensional sheet is 5 μm.

[0147] Experimental Example 9: The only difference between it and Experimental Example 1 is that the fineness of the first covering yarn is 3D, the fineness of the second covering yarn is also 3D, and the fineness of the elastic core yarn is 30D.

[0148] Experimental Example 10: The only difference between it and Experimental Example 1 is that the fineness of the first covering yarn is 6D, the fineness of the second covering yarn is also 6D, and the fineness of the elastic core yarn is 15D.

[0149] Experimental Example 11: The difference between this and Experimental Example 1 is that a small circular knitting machine is used to knit sun-protective pantyhose made from the sun-protective yarn prepared in Experimental Example 1. Specifically, this includes yarn threading: two of the sun-protective yarns are used to maintain the elasticity of the pantyhose body, and four nylon filaments are threaded into the yarn guide of the knitting machine, with the density and weave structure set.

[0150] Knitting and shaping: The knitting machine operates at 700 rpm, and the loop density is adjusted from top to bottom, gradually increasing to form the sock body. Reinforcement is achieved by adding yarn at the crotch and toe areas using stitches. Other specific methods and steps not mentioned can be found in Experimental Example 1.

[0151] The upper thigh area of ​​the sun-protective pantyhose has a knitting density of 360N / 0.2cm, and the lower leg area has a knitting density of 480N / 0.2cm.

[0152] Experimental Example 12: The difference between it and Experimental Example 1 is that the skin layer consists of only one layer, and the covering yarn forming the skin layer is prepared by the following steps: Polyester chips, nylon-66 chips, 10-50nm nano-titanium dioxide particles, and micron-sized metal oxide two-dimensional sheets were mixed in a mass ratio of 40:45:2:3, and 0.1% antioxidant 5057 (IRGANOX 5057) was added. The mixture was melt-blended at 260°C and spun into 5D fine denier fibers using a melt spinning machine. After pre-stretching at 75°C and heat-setting at 120°C, the coated yarn was obtained. The nano-titanium dioxide particles had a particle size of 30nm, and the transverse dimension of the micron-sized metal oxide two-dimensional sheet 102 was 2μm.

[0153] Using 20D spandex fiber as the elastic core yarn, the covered yarn is spirally wrapped by a high-speed covering machine (covering twist 800 twists / meter), and heat-set at 100℃ for 5 minutes to obtain a sunscreen yarn with a composite skin layer.

[0154] To better verify the effectiveness of Experimental Examples 1-10 above, the following comparative examples are provided: Comparative Example 1: The difference between it and Experimental Example 1 is that nano-sized titanium dioxide material is added only in the inner skin layer nylon fiber spinning and the outer skin layer nylon fiber spinning, wherein the particle size of the nano-sized titanium dioxide material is 30μm.

[0155] Comparative Example 2: The difference between it and Experimental Example 1 is that only the inner and outer sheath nylon fiber spinning processes add micron-sized two-dimensional metal oxide sheets, wherein the particle size of the micron-sized metal oxide two-dimensional sheets is 2 μm.

[0156] Comparative Example 3: The difference between it and Experimental Example 1 is that the nano-titanium dioxide particles account for 6% of the total mass of the skin layer, and the micron-sized metal oxide two-dimensional sheets account for 5% of the total mass of the skin layer.

[0157] Comparative Example 4: The difference between it and Experimental Example 1 is that the nano-titanium dioxide particles account for 1% of the total mass of the skin layer, and the micron-sized metal oxide two-dimensional sheets account for 0.8% of the total mass of the skin layer.

[0158] Comparative Example 5: It differs from Experimental Example 1 only in that the fineness of the first covering yarn is 1D, the fineness of the second covering yarn is also 1D, and the fineness of the elastic core yarn is 30D.

[0159] Comparative Example 6: Its only difference from Experimental Example 1 is that the fineness of the first covering yarn is 10D, the fineness of the second covering yarn is also 10D, and the fineness of the elastic core yarn is 30D.

[0160] Comparative Example 7: Its only difference from Experimental Example 1 is that the knitting density of the sun protection fabric is 280N / 0.2cm.

[0161] Comparative Example 8: Its only difference from Experimental Example 1 is that the knitting density of the sun protection fabric is 520N / 0.2cm.

[0162] Comparative Example 9: The difference between it and Experimental Example 12 is that the knitting density of the upper thigh area of ​​the sun-protective pantyhose is 340N / 0.2cm, and the knitting density of the calf area is 500N / 0.2cm.

[0163] Experimental methods: I. Snagging performance: Test subjects: Knitted sun protection fabrics prepared using the above-mentioned experimental examples 1-11 and comparative examples 1-8. Among them, experimental example 12 and comparative example 9 were tested on the upper thigh area and the lower leg area, respectively.

[0164] Test method: The test specimens were compared with standard photographs according to the national standard GB / T 11047-2008 "Evaluation of the snag performance of textiles - hammer test", and rated according to the standard of 1-5 levels. Test requirements: Level 5 (Optimal): No snagging or fraying on the surface.

[0165] Grade 4: Slight snagging.

[0166] Level 3: There are obvious streaks.

[0167] Level 2: Contains many hooks and threads.

[0168] Level 1 (Worst): Severe snagging, even with holes.

[0169] The higher the grade, the better the snag resistance of the stockings. Generally, a grade of 4 or higher is considered to have good snag resistance.

[0170] Specifically, the testing standards for this invention are as follows: Grade 4 or higher, with good anti-snagging ability; Grade 3-4, with anti-snagging properties; ≤3 grade, poor anti-snagging performance.

[0171] II. UV protection performance testing: Test subjects: Knitted sun protection fabrics prepared using the above-mentioned experimental examples 1-11 and comparative examples 1-8. Among them, experimental example 12 and comparative example 9 were tested on the upper thigh area and the lower leg area, respectively.

[0172] Test method: GB / T 18830-2009 "Evaluation of UV Protection Performance of Textiles" According to GB / T 18830-2009, only textiles that meet both of the following conditions can be called "UV protection products": Test data: UPF (Ultraviolet Protection Factor) ≥ 50 III. Wet UV Protection Performance Test Test subjects: Knitted sun protection fabrics prepared using the above-mentioned experimental examples 1-11 and comparative examples 1-8. Among them, experimental example 12 and comparative example 9 were tested on the upper thigh area and the lower leg area, respectively.

[0173] Test method: AATCC™ 183-2020e "Test of the transmission or blocking properties of ultraviolet radiation through fabrics"; the wet pretreatment adopts the immersion method: the sample is immersed in distilled water / artificial sweat, soaked at room temperature for 30 minutes, and lightly pressed to ensure wetting, to obtain a wet test sample; during the test, the wet sample is spread out on the test port, naturally covered without stretching, and the wet UPF and UVA transmittance are measured.

[0174] Test requirements: UPF (ultraviolet protection factor) ≥ 50; and T(UVA) AV (UVA transmittance) <5%; T(UVA) AV (UVB transmittance) <1%; UV-A blocking rate >95%; UV-B blocking rate >95%; UPFAV (Ultraviolet Protection Factor) ≥50.

[0175] IV. Stretched UV Protection Performance Test subjects: Knitted sun protection fabrics prepared using the above-mentioned experimental examples 1-11 and comparative examples 1-8. Among them, experimental example 12 and comparative example 9 were tested on the upper thigh area and the lower leg area, respectively.

[0176] Test method: Janezt-JSBZ-5002 Method 1, specifically testing UV protection through unidirectional (vertical or transverse) or bidirectional (simultaneous vertical and transverse stretching). This test uses unidirectional (transverse) stretching. The specific steps are as follows: Cut a 7cm long and 12cm long piece of fabric along the weft (horizontal) direction. Then fold each end of the fabric inward by 2cm and sew it into a sleeve 1cm from the folded edge. Mark a 5cm*5cm mark in the middle of the fabric.

[0177] Place the sample in the holder and adjust the holder according to the required weft stretch ratio. When the lateral stretch is 110%, place it in the UV tester with the right side of the fabric facing the integrating sphere emitter.

[0178] The UV protection performance under tensile conditions was tested in accordance with GB / T 18830.

[0179] Test requirements: UPF (ultraviolet protection factor) ≥ 50; and T(UVA) AV (UVA transmittance) <5%.

[0180] Stretch laterally to 110%.

[0181] V. Washability test: Test subjects: Knitted sun protection fabrics prepared using the above-mentioned experimental examples 1-11 and comparative examples 1-8. Among them, experimental example 12 and comparative example 9 were tested on the upper thigh area and the lower leg area, respectively.

[0182] Test method: GB / T 8629 "Home washing and drying procedures for textile testing" For sun-protective clothing, a Type A washing machine is typically used, along with 4A or ECE standard detergent, to wash and spin-dry at a water temperature of 40℃.

[0183] Refer to GB / T 18830 to test the UV protection performance of washed fabrics or products. If the UPF (ultraviolet protection factor) is less than 50, stop the washing process and record the number of washes.

[0184] Table 1. List of test results for Experimental Examples 1-12 and Comparative Examples 1-9

[0185] The above-mentioned experimental examples 1-10 used composite sunscreen functional components, yarn fineness, covering structure, and weaving density as the main variables; Comparative Examples 1-8 were compared with the experimental examples in terms of the types of functional components, their amounts, particle size, yarn fineness, and weaving density. In Experiment 11 (thigh and calf) and Experiment 9, the sun-protective yarn was further made into sun-protective pantyhose and knitted using zoned density.

[0186] Comparative Example 1 only added nano-sized titanium dioxide particles, and Comparative Example 2 only added micron-sized two-dimensional metal oxide sheets. Both had a certain blocking effect on ultraviolet rays, but the protection against UVA and UVB was uneven, resulting in a low overall UPF. In contrast, Experimental Examples 1-4 of this invention used a combination of nano-sized titanium dioxide particles and micron-sized two-dimensional metal oxide sheets. By utilizing the ultraviolet absorption and scattering effect of nano-sized titanium dioxide particles, combined with the planar physical shielding effect of micron-sized two-dimensional sheets, a synergistic sun protection system covering the entire spectrum was formed, significantly improving the UVA and UVB blocking rate and UPF value, with a protection effect far superior to that of a single component.

[0187] In further comparison, in Experiments 2-4, the amount of nano-TiO2 added was 2%-5%, and the amount of micron-sized metal oxide two-dimensional sheets added was 1%-3%. The fibers had good spinnability, the functional components were evenly dispersed, and a continuous and stable sunscreen layer could be formed, which had both excellent sunscreen performance and mechanical properties and hand feel.

[0188] In Comparative Example 3, the addition amount of nano-TiO2 was 6% and the addition amount of two-dimensional sheets was 5%. Excessive addition amounts easily lead to particle agglomeration, increased fiber brittleness, decreased strength, a stiffer feel, and poorer wearability. However, in Comparative Example 4, the addition amount of nano-TiO2 was 1% and the addition amount of two-dimensional sheets was 0.8%. Insufficient functional sites resulted in an inability to form effective shielding, significantly reducing the UV blocking effect. Therefore, within the addition amount range defined in this invention, an optimal balance can be achieved between sun protection performance, processing performance, and wearability.

[0189] Further comparisons in Examples 5 and 6, which used nano-TiO2 with particle sizes of 80 nm and 5 nm respectively, showed superior UV blocking effects. Smaller particle size TiO2 has a larger specific surface area and stronger UV absorption capacity; larger particle size TiO2 exhibits more pronounced scattering and better dispersibility. In Examples 7 and 8, the micron-sized metal oxide two-dimensional sheets had lateral dimensions of 0.5-5 μm, allowing for uniform orientation within the fiber sheath to form a continuous shielding layer, balancing shielding efficiency and spinnability. It is evident that within the particle size and dimensions described in this invention, efficient and stable UV protection can be achieved through the synergistic effect of absorption and scattering.

[0190] Further comparison revealed that in Experiments 1, 9, and 10, the fineness of the first covering yarn, the second covering yarn, and the elastic core yarn were adjusted. When the covering yarn fineness was 3D-6D and the elastic core yarn fineness was 15D-30D, the covering was tight and uniform, the sun protection layer was continuous and complete, and the yarn elasticity, resilience, hand feel, and strength were all excellent. In contrast, Comparative Example 5 used 1D covering yarn, resulting in insufficient covering, easy yarn leakage, discontinuous sun protection layer, and insufficient yarn strength; Comparative Example 6 used 10D covering yarn, which was too coarse and stiff, reducing elasticity and comfort. Therefore, in this invention, the fineness combination ensures a balance between sun protection effect, yarn structural stability, and wearing comfort.

[0191] Further experiment 1 employed an appropriate weave density and moderate fabric porosity, achieving a balance between high UPF and good breathability and elasticity through the combined effects of physical shielding and functional components. In contrast, Comparative Example 7 had a lower weave density, resulting in larger fabric pores that allowed UV rays to pass through easily, thus reducing sun protection performance; Comparative Example 8 had an excessively high weave density, resulting in a stiff fabric with poor breathability, restricted elasticity, and a stuffy, uncomfortable feel when worn. It is evident that weave density directly affects fabric porosity and physical shielding effectiveness; only within the range described in this invention can high sun protection and high comfort be achieved simultaneously.

[0192] Comparative analysis shows that Experiment 11 used sun-protective yarn to produce sun-protective pantyhose on a small circular knitting machine, employing a zoned (thigh and calf) density design: the upper thigh section had a knit density of 360N / 0.2cm, ensuring comfort, breathability, and a non-restrictive feel; the calf section had a knit density of 480N / 0.2cm, enhancing sun protection and support, and preventing sagging and deformation. In contrast, the upper thigh section of the sun-protective pantyhose in Comparative Example 9 had a knit density of 340N / 0.2cm, which was too low, resulting in insufficient sun protection and support. Conversely, the calf section of Comparative Example 9 had a knit density of 500N / 0.2cm, which was too high, causing tightness and compression, thus reducing the wearing experience.

[0193] It should be noted that although Comparative Examples 3, 8, and 9 (lower leg) have better sun protection factors, they are not suitable for use as sun protection clothing.

[0194] Taking Comparative Example 8 as an example, it also has a high weaving density, so it has a high washability coefficient, poor breathability, and the fabric is relatively stiff, making it unsuitable for sun protection clothing or sun protection pantyhose.

[0195] It is evident that the sun-protective yarn, knitted sun-protective veil, and sun-protective clothing or bodysuits supported by the present invention, due to the combination of nano-sized titanium dioxide particles and micron-sized metal oxide two-dimensional sheets, can achieve efficient blocking of the entire UVA and UVB bands, and the ultraviolet protection performance is far superior to that of a single system.

[0196] Furthermore, rationally controlling the particle size of nano-sized titanium dioxide particles and the lateral dimensions of nano-sized metal oxide two-dimensional sheets can also help improve sun protection stability and fiber spinnability.

[0197] Furthermore, optimizing the fineness of the covering yarn and the elastic core yarn can also ensure the continuity of the sun protection layer, the stability of the yarn structure, and excellent elasticity and hand feel.

[0198] In the specific weaving process, by controlling the appropriate weaving density or using zoned density weaving, the breathability, elasticity and wearing comfort of the fabric can be significantly improved while ensuring high UV protection.

[0199] The foregoing has provided a detailed description of a sun-protective yarn and its preparation method, as well as knitted sun-protective fabrics, sun-protective clothing, and sun-protective pantyhose disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention. Any modifications, equivalent substitutions, and improvements made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sun-protective yarn, characterized in that: The sun-protective yarn includes an elastic core yarn and a sheath layer. The sheath layer includes a covering yarn, which comprises nano-sized titanium dioxide particles and micron-sized two-dimensional metal oxide sheets. The nano-sized titanium dioxide particles account for 2%-5% of the total mass of the sheath layer, and the micron-sized two-dimensional metal oxide sheets account for 1%-3.5% of the total mass of the sheath layer. The covering yarn is spirally or parallelly wrapped around the elastic core yarn to form the sheath layer.

2. The sun-protective yarn as described in claim 1, characterized in that: The skin layer includes a first covering layer and a second covering layer. The first covering layer includes a first covering yarn having a mixture of nano-sized titanium dioxide particles and polyester. The first covering yarn covers the elastic core yarn to form a composite core. The second covering layer includes a second covering yarn having a mixture of micron-sized two-dimensional metal oxide sheets and polyamide. The second covering yarn covers the composite core to form the sunscreen yarn.

3. The sun-protective yarn as described in claim 2, characterized in that: The fineness of the first and second covering yarns is 3D-6D; and / or the fineness of the elastic core yarn is 15D-30D-30D.

4. The sun-protective yarn as described in claim 1, characterized in that: The nano-sized titanium dioxide particles have a particle size of 5-80 nm; and / or the lateral dimension of the micron-sized metal oxide two-dimensional sheets is 0.5-5 μm.

5. The sun-protective yarn as described in claim 2, characterized in that: The first coated yarn includes one or a combination of several of the following: nano silver ions, zinc oxide, copper ions, and organosilicon quaternary ammonium salts; and / or the second coated yarn includes one or a combination of several of the following: menthol microcapsules, xylitol microcapsules, and zero-degree titanium yarn.

6. A method for preparing a sunscreen yarn, characterized in that: It includes the following steps: Polyester and nano-sized titanium dioxide particles are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 250℃-270℃ to obtain fine denier polyester filaments. After stretching and shaping the fine denier polyester filaments, the desired first covered yarn is obtained. Using an elastic core yarn as the core yarn, the first covering yarn is spirally or parallelly wrapped around the elastic core yarn to form a composite core. Polyamide and micron-sized metal oxide two-dimensional sheets are mixed at a mass ratio of (90-98):(2-10) and melt-blended at 260℃-290℃ to obtain fine denier polyamide fibers. After stretching and setting, the desired second covered yarn is obtained. as well as The second covering yarn is wrapped around the composite core in a reverse spiral or in parallel, and then twisted and shaped to obtain the sun-protective yarn as described in claim 1.

7. A knitted sun-protective fabric, characterized in that: It comprises a top layer and a bottom layer made of the sun-protective yarn as described in any one of claims 1-4, wherein the bottom layer is made of abrasion-resistant yarn with a fineness of 15D-30D using a yarn-addition weaving process, and the knitted sun-protective fabric has a weight of 25g / m². 3 -35g / m 3 .

8. The knitted sun-protective fabric as described in claim 7, characterized in that: The surface of the knitted sun protection fabric is provided with at least a phosphorescent powder layer, wherein the particle size of the phosphorescent powder layer is 3-15μm; and / or the surface of the knitted sun protection fabric is attached with a hydrated shell layer.

9. A type of sun-protective clothing, characterized in that: Made from the knitted sun-protective fabric as described in claim 7; the sun-protective clothing includes any one of sun-protective pantyhose, sun-protective clothing, sun-protective arm sleeves, sun-protective hats, sun-protective face masks, sun-protective scarves, sun-protective yoga wear, and cycling sun-protective sets.

10. A type of sun-protective pantyhose, characterized in that: The sun-protective pantyhose is woven from the sun-protective yarn as described in any one of claims 1-5, and the knitting density of the sun-protective pantyhose is greater than or equal to 360N / 0.2cm. The sun-protective pantyhose includes an upper thigh area and a calf area, wherein the knitting density of the upper thigh area is less than the knitting density of the calf area.

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