Sun-proof cool pure cotton imitation woven fabric as well as preparation method and application thereof

Abstract

The invention relates to the technical field of fabrics, in particular to a sunscreen cool pure cotton imitation woven fabric as well as a preparation method and application thereof. The invention discloses a sun-proof cool-feeling pure cotton imitation woven fabric, the fabric is formed by weaving composite yarns, and the composite yarns are prepared by combining micro-nano fibers with a cool-feeling function and pure cotton fibers. According to the preparation method, the micro-nano fibers with the cool feeling function are mixed with the pure cotton fibers, and the composite yarn with the sun-proof cool feeling function is prepared; a weft knitting single-side circular knitting machine is adopted, the composite yarn is woven into the knitted fabric with the tatting imitating style, the problems that traditional pure cotton fabric is insufficient in sunscreen performance and cannot effectively block penetration of ultraviolet rays are solved, and meanwhile the problems that when a user wears the traditional fabric in summer, enough cool feeling cannot be provided, and the sun-proof effect is poor are solved. And the wearing comfort is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of fabrics, and in particular to a sun-proof cool pure cotton imitation woven fabric and a preparation method and application thereof. Background Art

[0002] As people's living standards improve, the requirements for the quality of summer clothing are gradually increasing. Traditional textiles can no longer meet the needs of modern consumers for comfort, functionality and environmental protection, so a variety of functional summer clothing has emerged on the market. These products not only need to have a good wearing experience, but also need to provide additional functions, such as sun protection, cooling, etc., to meet the needs of use in different environments. Especially in seasons with frequent outdoor activities, effectively protecting against ultraviolet radiation and providing an immediate cool feeling have become one of the important considerations for consumers to choose clothing. Although there are many fabrics with sun protection and cooling properties on the market, they each have certain limitations:

[0003] Sun protection: In order to improve the UV resistance of fabrics, organic or inorganic sunscreen additives are usually added to sun protection clothing. However, organic UV screeners have a relatively short absorption wavelength range and are easily decomposed under long-term exposure to UV rays, producing substances that may cause skin allergies; while inorganic UV screeners have better stability, they are easy to fall off from the surface of the fabric, affecting the long-term protection effect.

[0004] In terms of cooling sensation: Existing cooling fabrics mostly use jade fiber to enhance the cooling effect, but due to the large amount of jade powder added, the fiber strength decreases, reducing the durability and comfort of the fabric. In addition, traditional cooling materials are often difficult to combine well with natural fibers such as pure cotton, thus limiting their scope of application.

[0005] Therefore, although some woven fabrics on the market have good shape retention, strong crispness and diverse patterns, they generally have problems such as poor elasticity, poor comfort and lengthy production processes; and although conventional knitted fabrics are soft and breathable, they are not as structurally dense as woven fabrics, and cannot achieve excellent sun protection and cooling properties at the same time.

[0006] To this end, the present application provides a sun-proof cool pure cotton imitation woven fabric and a preparation method and application thereof. Summary of the invention

[0007] The present application provides a sun-proof cool pure cotton imitation woven fabric and a preparation method and application thereof. In the preparation method, jade powder, graphene and other materials with a cool feeling function are mixed with polystyrene, lignin and the like, and dissolved in a specific organic solvent to prepare a cool spinning solution; the cool spinning solution is spun using an electrostatic spinning device to form micro-nano fibers; the micro-nano fibers are mixed with pure cotton fibers, and composite yarns with a cool feeling function are prepared through processes such as drawing, roving, spun yarn and winding; a weft knitting single-sided large circular machine is used to weave the composite yarn and spandex into a knitted fabric with an imitation woven style, thereby solving the problem that traditional pure cotton fabrics are insufficient in terms of sun protection performance and cannot effectively block the penetration of ultraviolet rays. At the same time, it can also solve the problem that traditional fabrics often cannot provide sufficient coolness when worn in summer, resulting in reduced wearing comfort, and solve the problem that knitted fabrics with an imitation woven style are prone to structural instability and unevenness during the weaving process.

[0008] The technical solution adopted by this application to solve its technical problem is:

[0009] In a first aspect, the present application provides a sun-proof cool pure cotton imitation woven fabric, the fabric is formed by weaving a composite yarn and spandex, the composite yarn is prepared by combining micro-nano fibers with a cool feeling function and pure cotton fibers;

[0010] The method for preparing the micro-nano fibers comprises the following steps:

[0011] The polystyrene, graphene and lignin are mixed, the mixed solution is extruded through a screw extruder, and jade powder is added to obtain a cool spinning solution;

[0012] The electrostatic spinning technology is used to prepare the cool spinning solution into micro-nano fibers.

[0013] In some specific embodiments, in the cool spinning solution, the weight proportion of jade powder is 3-6%, the weight proportion of graphene is 6-12%, the weight proportion of polystyrene is 8-12%, the weight proportion of lignin is 5-8%, and the weight proportion of organic solvent is 62-78%.

[0014] In some specific embodiments, the particle size of graphene is ≤8 μm; and the particle size of the jade powder is ≤6 μm.

[0015] In some specific embodiments, the process conditions of the electrospinning technology are: spinning temperature is 24-26°C, spinning humidity is 23%-40%, spinning cotton web receiving distance is 20-40cm, the electrospinning equipment is turned on, and the applied voltage is set to 8-12KV.

[0016] In some specific embodiments, in the composite yarn, the weight content of the micro-nano fibers is 2-5%, and the weight content of the pure cotton fibers is 95-98%.

[0017] In some specific embodiments, the instantaneous coolness value of the imitation woven fabric is ≥ 0.23 W / cm 2 , air permeability ≥328mm / s, UPF value ≥41.

[0018] In a second aspect, the present application provides a method for preparing the sun-proof cool pure cotton imitation woven fabric according to the first aspect, characterized in that it comprises the following steps:

[0019] S1. Preparation of cool spinning solution

[0020] S2. Preparation of micro-nano fibers by electrospinning technology

[0021] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0022] The micro-nano fibers and pure cotton fibers are mixed and made into composite yarns through drawing, roving, spinning and winding processes;

[0023] S4. The composite yarn and 20D spandex yarn are prepared by weaving a woven fabric;

[0024] The composite yarn and 20D spandex are made into sun-proof and cool pure cotton imitation woven fabric using a weft knitting single-sided circular machine.

[0025] In some specific embodiments, in step S4, the composite yarn and the spandex yarn are combined and woven in a cycle of 4 passes; the first pass is sequentially looping and floating line; the second pass is sequentially floating line and looping; the third pass is sequentially floating line and looping; the fourth pass is sequentially looping and floating line.

[0026] In some specific embodiments, the prepared imitation woven fabric has a horizontal density of 40-80 wales / 5 cm and a vertical density of 25-50 wales / 5 cm.

[0027] In some specific embodiments, the prepared imitation woven fabric has a composite yarn content of 96-98% and a 20D spandex content of 2-4%. In a third aspect, the present application provides an application of the imitation woven fabric, wherein the sun-proof cool pure cotton imitation woven fabric described in the first aspect or the sun-proof cool pure cotton imitation woven fabric obtained by the preparation method described in the second aspect is applied to summer clothing.

[0028] The beneficial effects of this application are:

[0029] The fabric described in the present application is prepared by using polystyrene, graphene, lignin and jade powder to form a cool spinning solution, and then obtaining micro-nano fibers through electrostatic spinning. In the micro-nano fibers, the jade powder is effectively adsorbed on the surface of the micro-nano fiber structure to form micro-nano fibers with a cool feeling, which can not only improve the coolness of the fibers, but also improve the toughness of the fibers. Furthermore, the micro-nano fibers and pure cotton fibers are combined to prepare composite yarns, and then the composite yarns are woven into sun-proof cool pure cotton woven fabrics, which have a soft texture, good elasticity, compact structure, low porosity, and good UV protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 This is a weaving schematic diagram of the sun-proof cool pure cotton imitation woven fabric described in this application.

[0032] Figure 2 This is a schematic diagram of the triangular arrangement of the sun-proof cool pure cotton imitation woven fabric described in this application. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0035] In the present application, "at least one" means one or more, and "plurality" means two or more. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, "at least one of a, b, or c", or "at least one of a, b, and c" can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple, respectively.

[0036] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and 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 of the embodiments of the present application.

[0037] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0038] The weight of the relevant components mentioned in the embodiment description of the present application can not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the embodiment description of the present application, it is within the scope disclosed in the embodiment description of the present application. Specifically, the mass described in the embodiment description of the present application can be a mass unit known in the chemical industry such as μg, mg, g, kg, etc.

[0039] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0040] Terminology explanation:

[0041] Knitted fabrics are made by continuously forming a series of interconnected loops from one or more yarns. Knitting can be divided into weft knitting and warp knitting according to the way the yarn is fed. Weft knitting: The yarn is fed horizontally to the needle bed, and each row is completed with the same yarn. This process can be done using a circular knitting machine or a flat knitting machine; Warp knitting: Multiple yarns are arranged in parallel and fed longitudinally, and each yarn forms a loop in each row. The characteristics of knitted fabrics are: usually good elasticity, fast production speed, relatively low cost, and the surface texture may be soft and delicate.

[0042] Woven fabrics are formed by interweaving two sets of perpendicularly intersecting yarns - warp (longitudinal) and weft (transverse). The traditional weaving method is carried out on a loom, where the weft is carried by a shuttle through the fixed warp. Modern machinery uses shuttleless looms, such as rapier looms, air jet looms, etc. to improve efficiency. The characteristics of woven fabrics are: stable structure, not easy to deform, not easy to unravel at the edges, can produce complex patterns and high density, relatively hard, not as elastic as knitted fabrics.

[0043] A sun-proof cool pure cotton imitation woven fabric, the fabric is woven by composite yarn, and the composite yarn is prepared by combining micro-nano fibers with cool function and pure cotton fibers;

[0044] The method for preparing the micro-nano fibers comprises the following steps:

[0045] The polystyrene, graphene and lignin are mixed, the mixed solution is extruded through a screw extruder, and jade powder is added to obtain a cool spinning solution;

[0046] The electrostatic spinning technology is used to prepare the cool spinning solution into micro-nano fibers.

[0047] Specifically, in the cool spinning solution, the weight proportion of jade powder is 3-6%, the weight proportion of graphene is 6-12%, the weight proportion of polystyrene is 8-12%, the weight proportion of lignin is 5-8%, and the weight proportion of organic solvent is 62-78%.

[0048] Wherein: the particle size of graphene is ≤8 μm; the particle size of the jade powder is ≤6 μm; and the organic solvent is selected from one or two of N,N-dimethylformamide and tetrahydrofuran.

[0049] The preparation process of the cool spinning solution is as follows: polystyrene, graphene and lignin are dissolved in an organic solvent, and the mixed solution is extruded from a screw extruder at 180-200° C.; jade powder is then added to the mixed solution, and stirred at room temperature for 70-90 minutes to obtain the cool spinning solution.

[0050] In this application, the addition of jade powder (3-6%) and graphene (6-12%) gives the fabric a cooling property. The particle sizes of jade powder and graphene are controlled at ≤6μm and ≤8μm, respectively, to ensure that these particles are evenly dispersed in the fiber and do not affect the feel and strength of the fiber. If the particle size is too large, it may not effectively provide a cooling effect, and may reduce the flexibility and durability of the fiber.

[0051] The addition of polystyrene (8-12%) and lignin (5-8%) helps to form a stable micro-nano fiber structure, thereby improving the mechanical properties of the fiber, such as strength and elastic modulus. In addition, the good biocompatibility of polystyrene also enables it to be used as a carrier to fix other functional components on the fiber surface.

[0052] The organic solvent (62-78%) is mainly used to dissolve the above solid components so that they can be evenly distributed during the mixing process. The selected N,N-dimethylformamide or tetrahydrofuran has appropriate volatility and is easy to remove during the subsequent treatment process without remaining in the final product.

[0053] Specifically, the process conditions of the electrospinning technology are as follows: the cool spinning solution is transferred into the electrospinning solution supply system of the electrospinning equipment, the spinning temperature is 24-26°C, the spinning humidity is 23%-40%, the spinning cotton web receiving distance is 20-40cm, the electrospinning equipment is turned on, the applied voltage is set to 8-12KV, the speed of the carding machine is controlled, and the corresponding parameters are matched according to the silk output state to obtain continuously produced and uniformly inlaid micro-nano fibers.

[0054] The spinning temperature is 24-26°C, which ensures that the spinning solution will not decompose or change its properties due to excessively high temperature during the spraying process, nor will it affect the fluidity of the spinning solution due to excessively low temperature, thus failing to form an ideal fiber structure.

[0055] The spinning humidity is 23% to 40%, which is helpful for charge retention and fiber morphology control during the spinning process. If the humidity is too high, the fiber may absorb too much water, affecting its physical properties; if the humidity is too low, the fiber may dry too quickly and be difficult to form.

[0056] The receiving distance of the spinning cotton net is 20-40cm, ensuring that there is enough time and space for the spinning solution to be stretched and solidified from the nozzle to the collector to form uniform and slender fibers. If the distance is too short, the fibers may pile up before they are completely solidified, and if the distance is too long, the fibers may fly in the air for too long, lose directionality, and be difficult to distribute evenly.

[0057] The applied voltage is 8-12KV, which determines whether the spinning solution can be effectively stretched into fine fibers. If the voltage is too low, the spinning solution may not be fully stretched, and the formed fiber diameter is large, or even continuous fibers cannot be formed; if the voltage is too high, it may cause excessive current, causing safety problems, and may damage the spinning solution components, affecting the quality of the final fiber.

[0058] Control the carding machine speed and match the corresponding parameters according to the silk output status to ensure that the fibers can be evenly spread and embedded in the yarn, while avoiding fiber breakage or accumulation caused by speed mismatch.

[0059] In some specific embodiments, the weight content of the micro-nano fiber in the composite yarn is 2-5%, and the weight content of the pure cotton fiber is 95-98%. The short fiber in the composite raw sliver of the cool micro-nano fiber and short fiber is pure cotton fiber; in the composite process of the cool micro-nano fiber and the short fiber, an oven and a far-infrared heating device are installed before the composite web is gathered to ensure that the raw sliver is dry and the solvent is completely volatilized without residue.

[0060] In the present application, the micro-nano fibers have a weight content of 2-5% and contain jade powder, graphene and other ingredients, which can give the fabric an instant cool feeling and sun protection function.

[0061] Most of the composite yarn is pure cotton fiber, which ensures that the fabric has good moisture absorption and breathability, providing comfort. At the same time, the pure cotton fiber provides sufficient mechanical strength, making the fabric more durable.

[0062] In some specific embodiments, the instantaneous coolness value of the imitation woven fabric is ≥ 0.23 W / cm 2 , air permeability ≥328mm / s, UPF value ≥41.

[0063] In addition, the preparation method of the above-mentioned imitation woven fabric comprises the following steps:

[0064] S1. Preparation of cool spinning solution

[0065] Dissolve polystyrene, graphene and lignin in N,N-dimethylformamide and tetrahydrofuran, and extrude the mixed solution from a screw extruder at 180-200° C.; then add jade powder into the mixed solution, stir at room temperature for 70-90 minutes, and obtain a cool spinning solution.

[0066] In the cool spinning solution: the weight proportion of jade powder is 3-6%, the weight proportion of graphene is 6-12%, the weight proportion of polystyrene is 8-12%, the weight proportion of lignin is 5-8%, and the weight proportion of organic solvent is 62-78%; the particle size of graphene is ≤8μm; the particle size of the jade powder is ≤6μm.

[0067] S2. Preparation of micro-nano fibers by electrospinning technology

[0068] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is 24-26°C, the spinning humidity is 23%-40%, the spinning cotton web receiving distance is 20-40cm, the electrospinning equipment is turned on, and the applied voltage is set to 8-12KV to obtain micro-nano fibers.

[0069] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0070] The micro-nano fibers and pure cotton fibers are mixed, and composite yarns are prepared through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarns is 2-5%, and the weight content of the pure cotton fibers is 95-98%;

[0071] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0072] S4. The composite yarn and 20D spandex are prepared by weaving a woven fabric;

[0073] like Figure 1 , 2As shown, a weft knitting single-sided circular machine is used to make composite yarn and 20D spandex into a woven-like fabric.

[0074] The composite yarn and spandex yarn are combined and woven in a cycle of 4 routes; the first route is looping and floating; the second route is floating and looping; the third route is floating and looping; the fourth route is looping and floating. The 1st and 4th routes and the 2nd and 3rd routes are woven with low and high foot stitches respectively. This weaving structure makes the cloth surface flat, drapey, and the fabric is more compact.

[0075] The above-mentioned preparation method obtains imitation woven fabrics, the width of which is controlled at 140-160cm, and the weight of which is controlled at 90-150g / m 2 The transverse density of the fabric is 40-80 wales / 5cm, the longitudinal density is 25-50 wales / 5cm, the content of composite yarn is controlled at 96-98%, and the content of 20D spandex yarn is controlled at 2-4%.

[0076] The imitation woven fabric described in the present application is further described through the following embodiments and comparative examples.

[0077] Example 1

[0078] The method for preparing the imitation woven fabric comprises the following steps:

[0079] S1. Preparation of cool spinning solution

[0080] Polystyrene, graphene and lignin are dissolved in N,N-dimethylformamide, and the mixed solution is extruded from a screw extruder at 180°C; jade powder is then added to the mixed solution, and stirred at room temperature for 70 minutes to obtain a cool spinning solution.

[0081] In the cool spinning solution: the weight of jade powder accounts for 3%, the weight of graphene accounts for 6%, the weight of polystyrene accounts for 8%, the weight of lignin accounts for 5%, and the weight of N,N-dimethylformamide accounts for 78%; the particle size of graphene is 8 μm; the particle size of the jade powder is 6 μm;

[0082] S2. Preparation of micro-nano fibers by electrospinning technology

[0083] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is controlled at 24-26°C, the spinning humidity is controlled at 23%-40%, the spinning cotton net receiving distance is 20cm, the electrospinning equipment is turned on, and the applied voltage is set to be controlled at 8-12KV to obtain micro-nano fibers.

[0084] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0085] The micro-nano fibers and pure cotton fibers are mixed, and composite yarn is made through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarn is 2%, and the weight content of the pure cotton fibers is 98%;

[0086] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0087] S4. The composite yarn and 20D spandex are prepared by weaving a woven fabric;

[0088] Using a weft knitting single-sided circular machine, the composite yarn and 20D spandex are made into 80S sun-proof and cool pure cotton imitation woven fabric.

[0089] The composite yarn and spandex yarn are combined and woven in a cycle of 4 routes; the first route is looping and floating line; the second route is floating line and looping; the third route is floating line and looping; the fourth route is looping and floating line.

[0090] The imitation woven fabric is knitted fabric, the width is controlled at 140-160cm, and the weight is controlled at 120-130g / m 2 , the content of composite yarn is 96%, and the content of 20D spandex yarn is 4%.

[0091] Example 2

[0092] The method for preparing the imitation woven fabric comprises the following steps:

[0093] S1. Preparation of cool spinning solution

[0094] Polystyrene, graphene and lignin are dissolved in N,N-dimethylformamide, and the mixed solution is extruded from a screw extruder at 200°C; jade powder is then added to the mixed solution, and stirred at room temperature for 90 minutes to obtain a cool spinning solution.

[0095] In the cool spinning solution: the weight of jade powder accounts for 6%, the weight of graphene accounts for 12%, the weight of polystyrene accounts for 12%, the weight of lignin accounts for 8%, and the weight of N,N-dimethylformamide accounts for 62%; the particle size of graphene is 7 μm; the particle size of the jade powder is 5 μm;

[0096] S2. Preparation of micro-nano fibers by electrospinning technology

[0097] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is controlled at 24-26°C, the spinning humidity is controlled at 23%-40%, the spinning cotton net receiving distance is 30cm, the electrospinning equipment is turned on, and the applied voltage is set to be controlled at 8-12KV to obtain micro-nano fibers.

[0098] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0099] The micro-nano fibers and pure cotton fibers are mixed, and composite yarn is prepared through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarn is 5%, and the weight content of the pure cotton fibers is 95%;

[0100] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0101] S4. The composite yarn and 20D spandex are prepared by weaving a woven fabric;

[0102] Using a weft knitting single-sided circular machine, the composite yarn and 20D spandex are made into 80S sun-proof and cool pure cotton imitation woven fabric.

[0103] The composite yarn and spandex yarn are combined and woven in a cycle of 4 routes; the first route is looping and floating line; the second route is floating line and looping; the third route is floating line and looping; the fourth route is looping and floating line.

[0104] Get imitation woven fabrics, the width is controlled at 140-160cm, the weight is controlled at 90-100g / m 2 , the content of composite yarn is 98%, and the content of 20D spandex yarn is 2%.

[0105] Example 3

[0106] The method for preparing the imitation woven fabric comprises the following steps:

[0107] S1. Preparation of cool spinning solution

[0108] Polystyrene, graphene and lignin are dissolved in N,N-dimethylformamide, and the mixed solution is extruded from a screw extruder at 180°C; jade powder is then added to the mixed solution, and stirred at room temperature for 70 minutes to obtain a cool spinning solution.

[0109] In the cool spinning solution: the weight proportion of jade powder is 4%, the weight proportion of graphene is 8%, the weight proportion of polystyrene is 10%, the weight proportion of lignin is 6%, and the weight proportion of N,N-dimethylformamide is 72%; the particle size of graphene is 6 μm; the particle size of the jade powder is 4 μm;

[0110] S2. Preparation of micro-nano fibers by electrospinning technology

[0111] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is controlled at 24-26°C, the spinning humidity is controlled at 23%-40%, the spinning cotton net receiving distance is 40cm, the electrospinning equipment is turned on, and the applied voltage is set to be controlled at 8-12KV to obtain micro-nano fibers.

[0112] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0113] The micro-nano fibers and pure cotton fibers are mixed, and composite yarn is made through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarn is 3%, and the weight content of the pure cotton fibers is 97%;

[0114] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0115] S4. The composite yarn is prepared by weaving a woven fabric;

[0116] Using a weft knitting single-sided circular machine, the composite yarn and 20D spandex are made into 80S sun-proof and cool pure cotton imitation woven fabric.

[0117] The composite yarn and spandex yarn are combined and woven in a cycle of 4 routes; the first route is looping and floating line; the second route is floating line and looping; the third route is floating line and looping; the fourth route is looping and floating line.

[0118] Get imitation woven fabrics, the width is controlled at 140-160cm, the weight is controlled at 100-110g / m 2 , the content of composite yarn is 97%, and the content of 20D spandex yarn is 3%.

[0119] Example 4

[0120] The method for preparing the imitation woven fabric comprises the following steps:

[0121] S1. Preparation of cool spinning solution

[0122] Polystyrene, graphene and lignin are dissolved in tetrahydrofuran, and the mixed liquid is extruded from a screw extruder at 180-200° C.; jade powder is then added to the mixed liquid, and stirred at room temperature for 70-90 minutes to obtain a cool spinning solution.

[0123] In the cool spinning solution: the weight proportion of jade powder is 3%, the weight proportion of graphene is 12%, the weight proportion of polystyrene is 9%, the weight proportion of lignin is 8%, and the weight proportion of tetrahydrofuran is 68%; the particle size of graphene is 8 μm; the particle size of the jade powder is 6 μm;

[0124] S2. Preparation of micro-nano fibers by electrospinning technology

[0125] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is controlled at 24-26°C, the spinning humidity is controlled at 23%-40%, the spinning cotton net receiving distance is 25cm, the electrospinning equipment is turned on, and the applied voltage is set to be controlled at 8-12KV to obtain micro-nano fibers.

[0126] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0127] The micro-nano fibers and pure cotton fibers are mixed, and composite yarn is made through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarn is 4%, and the weight content of the pure cotton fibers is 96%;

[0128] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0129] S4. The composite yarn is prepared by weaving a woven fabric;

[0130] Using a weft knitting single-sided circular machine, the composite yarn and 20D spandex are made into 80S sun-proof and cool pure cotton imitation woven fabric.

[0131] The composite yarn and spandex yarn are combined and woven in a cycle of 4 routes; the first route is looping and floating line; the second route is floating line and looping; the third route is floating line and looping; the fourth route is looping and floating line.

[0132] Get imitation woven fabrics, the width is controlled at 140-160cm, the weight is controlled at 110-120g / m 2 , the content of composite yarn is 96%, and the content of 20D spandex yarn is 4%.

[0133] Example 5

[0134] The method for preparing the imitation woven fabric comprises the following steps:

[0135] S1. Preparation of cool spinning solution

[0136] Polystyrene, graphene and lignin are dissolved in tetrahydrofuran, and the mixed liquid is extruded from a screw extruder at 180-200° C.; jade powder is then added to the mixed liquid, and stirred at room temperature for 70-90 minutes to obtain a cool spinning solution.

[0137] In the cool spinning solution: the weight of jade powder accounts for 5%, the weight of graphene accounts for 11%, the weight of polystyrene accounts for 11%, the weight of lignin accounts for 7%, and the weight of tetrahydrofuran accounts for 66%; the particle size of graphene is 5 μm; the particle size of the jade powder is 5 μm;

[0138] S2. Preparation of micro-nano fibers by electrospinning technology

[0139] The cool spinning solution of step S1 is transferred into the electrospinning liquid supply system of the electrospinning equipment; the electrospinning conditions are set as follows: the spinning temperature is controlled at 24-26°C, the spinning humidity is controlled at 23%-40%, the spinning cotton net receiving distance is 35cm, the electrospinning equipment is turned on, and the applied voltage is set to be controlled at 8-12KV to obtain micro-nano fibers.

[0140] S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers

[0141] The micro-nano fibers and pure cotton fibers are mixed, and composite yarn is made through drawing, roving, spinning and winding processes; the weight content of the micro-nano fibers in the composite yarn is 3.5%, and the weight content of the pure cotton fibers is 96.5%;

[0142] The spinning method adopts compact spinning, and the pure cotton fiber is 80s / 1 combed pure cotton.

[0143] S4. The composite yarn is prepared by weaving a woven fabric;

[0144] Using a weft knitting single-sided circular machine, the composite yarn and 20D spandex are made into 80S sun-proof and cool pure cotton imitation woven fabric.

[0145] Among them: the composite yarn and the spandex yarn are combined and woven in a cycle of 4 routes; the first route is loop formation and floating line; the second route is floating line and loop formation; the third route is floating line and loop formation; the fourth route is loop formation and floating line.

[0146] Get imitation woven fabrics, the width is controlled at 140-160cm, the weight is controlled at 130-150g / m 2 , the content of composite yarn is 96%, and the content of 20D spandex yarn is 4%.

[0147] Comparative Example 1

[0148] The preparation method of the imitation woven fabric comprises the following steps:

[0149] No graphene and lignin were added to the cool spinning solution, and finally 80S sun-proof cool pure cotton imitation woven fabric was woven; the other conditions were the same as those in Example 1.

[0150] Comparative Example 2

[0151] The preparation method of the imitation woven fabric comprises the following steps:

[0152] There is no electrospinning equipment, pure cotton yarn and spandex yarn are combined, the fabric weaving process remains unchanged, and finally 80S sun-proof pure cotton imitation woven fabric is woven; the other conditions are the same as those in Example 1.

[0153] Comparative Example 3

[0154] The preparation method of the imitation woven fabric comprises the following steps:

[0155] There is no electrospinning equipment, and pure cotton yarn (without spandex yarn) is used to weave 80S pure cotton woven plain fabric through a rapier loom; the other conditions are the same as those in Example 1.

[0156] The fabrics prepared in Examples 1 to 5 and Comparative Examples 1 to 3 were tested according to the following testing methods, and the results are summarized in Table 1.

[0157] (1) Contact coolness coefficient test:

[0158] The test method of contact coolness coefficient refers to GB / T 35263-2017. In the test, a heat detection plate with a temperature higher than the specified temperature difference of the sample is in contact with the sample at a certain pressure. The maximum value of the heat flux density during the heat transfer process after the heat detection plate contacts the sample is recorded as qmax, with the unit of joule per square centimeter second [J / (cm 2 ·s)].

[0159] (2) Air permeability test

[0160] The air permeability was determined according to GB / T 5453-1997 "Determination of air permeability of textile fabrics". Under the specified pressure difference conditions, the air flow rate passing vertically through a given area of ​​the sample within a certain period of time was measured to calculate the air permeability. The test area used in this paper is 20cm 2 , the pressure drop is 100Pa.

[0161] (3) UV resistance test

[0162] The anti-ultraviolet performance refers to GB / T18830-2009 "Evaluation of the Anti-ultraviolet Performance of Textiles", and the testing instrument is HB902C Fabric Anti-ultraviolet Transmission and Sunscreen Protection Instrument. The fabric samples are tested at a temperature of 25°C and a humidity of 65%. Each sample is tested 5 times, and the measured values ​​are averaged.

[0163] Table 1

[0164] <![CDATA[Instantaneous cool feeling value / qmax (W / cm 2 )]]> Air permeability / (mm / s) UPF value Example 1 0.23 328 43 Example 2 0.25 330 44 Example 3 0.24 335 42 Example 4 0.26 340 45 Example 5 0.27 338 46 Comparative Example 1 0.2 332 41 Comparative Example 2 0.17 356 40 Comparative Example 3 0.18 408 38

[0165] From Table 1, we can see that:

[0166] The instantaneous coolness value / qmax (W / cm 2 ) is 0.23-0.27, showing a good instantaneous coolness value; air permeability / (mm / s) ≥328, with high air permeability; UPF value ≥42, with good protection against ultraviolet rays, which can solve the problem that traditional pure cotton fabrics have insufficient sun protection performance and cannot effectively block ultraviolet penetration, as well as solve the problem that traditional fabrics cannot provide enough coolness when worn in summer, and improve the problem of unstable and uneven structure of imitation woven style knitted fabrics during the weaving process.

[0167] The fabric of comparative example 1, instant coolness value / qmax(W / cm 2 ): 0.20, air permeability / (mm / s): 332, UPF value: 41; Compared with Example 1, the coolness value of Comparative Example 1 is slightly lower than that of Example 1, because no graphene and lignin are added in Comparative Example 1, and these two materials play a synergistic role in Example 1, and improve the coolness effect by forming a nanofiber structure. In terms of air permeability, the air permeability of Comparative Example 1 is slightly higher than that of Example 1, which may be due to the fact that the fiber structure is relatively looser after the lack of components such as graphene, thereby increasing the space for air circulation. In terms of UPF value, the UPF value of Comparative Example 1 is also slightly lower, indicating that the UV protection ability of the fabric is weakened after the lack of graphene and lignin.

[0168] The instantaneous coolness value / qmax(W / cm 2 ): 0.17, air permeability / (mm / s): 356, UPF value: 40; the cool feeling value of comparative example 2 is significantly lower than that of example 1, because comparative example 2 does not have an electrospinning device, and micro-nano fibers cannot be prepared, resulting in the inability of jade powder and graphene and other components to be effectively embedded on the fiber surface, thereby greatly reducing the cool feeling effect. In terms of air permeability, the air permeability of comparative example 2 is very high (356mm / s), because it has not been treated with electrospinning, the fiber structure is looser, and more air circulation paths are provided, and the UPF value is therefore reduced, slightly lower than that of comparative example 1, but because the woven structure is the same as that of comparative example 1, it still provides a certain degree of UV protection.

[0169] The instantaneous coolness value / qmax(W / cm 2): 0.18, air permeability / (mm / s): 408, UPF value: 38; In terms of instant coolness value, the coolness value of Comparative Example 3 is lower, because it is a traditional woven plain fabric and lacks the coolness property imparted by a specific process in Example 1. In terms of air permeability, the air permeability of Comparative Example 3 is significantly higher than that of Example 1 (408mm / s), because the knitted imitation woven structure of Example 1 is tighter than the traditional woven plain structure, and there is less space for air circulation. In terms of UPF value, the UPF value of Comparative Example 3 is the lowest, which may be because the traditional woven plain structure is relatively loose and has a higher ultraviolet transmittance. If its sun protection performance is to be improved, its tightness needs to be improved. However, the tightness of this structure is at the expense of air permeability and coolness.

[0170] Therefore, based on Example 1 and Comparative Examples 1-3, it can be found that the fabric of the present invention, the added graphene, lignin and polystyrene have a synergistic effect, polystyrene has good biocompatibility, and can be blended with lignin and graphene to form a nanofiber structure, thereby effectively adsorbing nano zinc oxide and jade powder and embedding them on the surface of the nanofiber structure, which can not only improve the cool feeling, but also enhance the fiber strength and improve the service life of the material.

[0171] Secondly, the sun protection UPF value of the knitted imitation woven tight structure is better than that of the woven plain weave structure, and the air permeability value is slightly lower, but meets the standard requirements, indicating that in the fabric of the present invention, the knitted imitation woven weaving structure is flatter, more uniform and tighter than the woven plain weave structure.

[0172] In addition, knitted fabrics have great extensibility and will deform to a certain extent as the body moves during wearing. This deformation helps to exchange air and thus improves breathability. Since the knitted imitation woven structure is made of coils, even if the imitation woven effect makes the structure tighter, there may still be more gaps in comparison, so the effect of the structure on sun protection performance will be lower than that of the woven plain structure; however, the knitted imitation woven fabric is more compact in structure than ordinary woven plain fabric, which will improve the ability to block ultraviolet rays to a certain extent, so the final sun protection effect is not much different from that of woven plain fabric.

[0173] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A sun-proof cool pure cotton imitation woven fabric, the fabric is woven from composite yarns, characterized in that: The composite yarn is prepared by combining micro-nano fibers with a cooling function and pure cotton fibers; The method for preparing the micro-nano fibers comprises the following steps: The polystyrene, graphene and lignin are mixed, the mixed solution is extruded through a screw extruder, and jade powder is added to obtain a cool spinning solution; The electrostatic spinning technology is used to prepare the cool spinning solution into micro-nano fibers.

2. The sun-proof cool pure cotton imitation woven fabric according to claim 1, characterized in that: In the cool spinning solution, the weight proportion of jade powder is 3-6%, the weight proportion of graphene is 6-12%, the weight proportion of polystyrene is 8-12%, the weight proportion of lignin is 5-8%, and the weight proportion of organic solvent is 62-78%.

3. The sun-proof cool pure cotton imitation woven fabric according to claim 1, characterized in that: The particle size of the graphene is ≤8 μm; the particle size of the jade powder is ≤6 μm.

4. The sun-proof cool pure cotton imitation woven fabric according to claim 1, characterized in that: The process conditions of the electrospinning technology are: spinning temperature of 24-26° C., spinning humidity of 23%-40%, spinning cotton web receiving distance of 20-40 cm, turning on the electrospinning equipment, and setting the applied voltage to 8-12 KV.

5. The sun-proof cool pure cotton imitation woven fabric according to claim 1, characterized in that: In the composite yarn, the weight content of the micro-nano fiber is 2-5%, and the weight content of the pure cotton fiber is 95-98%.

6. The sun-proof cool pure cotton imitation woven fabric according to claim 1, characterized in that: The instant coolness value of the imitation woven fabric is ≥ 0.23W / cm 2 , air permeability ≥328mm / s, UPF value ≥41.

7. The method for preparing the sun-proof cool pure cotton imitation woven fabric according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preparation of cool spinning solution S2. Preparation of micro-nano fibers by electrospinning technology S3. Preparation of composite yarn by combining micro-nano fibers and pure cotton fibers The micro-nano fibers and pure cotton fibers are mixed and made into composite yarns through drawing, roving, spinning and winding processes; S4. The composite yarn is prepared by weaving a woven fabric; The composite yarn and 20D spandex are made into sun-proof and cool pure cotton imitation woven fabric using a weft knitting single-sided circular machine.

8. The preparation method according to claim 7, characterized in that: In step S4, weaving is performed with 4 routes as a cycle; the first route is looping and floating thread; the second route is floating thread and looping; the third route is floating thread and looping; the fourth route is looping and floating thread.

9. The preparation method according to claim 7, characterized in that: The prepared imitation woven fabric has a horizontal density of 40-80 wales / 5cm and a vertical density of 25-50 wales / 5cm.

10. Application of imitation woven fabrics, characterized in that: The sun-proof cool pure cotton imitation woven fabric described in any one of claims 1 to 6 or the sun-proof cool pure cotton imitation woven fabric obtained by the preparation method described in any one of claims 7 to 9 is applied to summer clothing.

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