Mosquito repellent skin-friendly fiber blended yarn for clothing and its production method

Abstract

The application provides a mosquito-repelling skin-friendly fiber blended yarn for clothing, which is blended by 65-75 parts by weight of modified viscose fiber and 35-40 parts by weight of multifunctional diatomite fiber. The mosquito-repelling skin-friendly fiber blended yarn for clothing of the application is blended by two kinds of artificial fibers, i.e. modified viscose fiber and multifunctional diatomite fiber, and has good antibacterial performance and good adsorption performance; the moisture absorption and quick drying property are greatly improved, the skin-friendliness is good, the mosquito-repelling effect is good and long-lasting, the mosquito-repelling effect is still good after 20 times of washing; and the breaking strength is high, the mechanical property is good, the antibacterial adsorption property is good, and the comprehensive performance is excellent.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, specifically to a mosquito-repellent and skin-friendly fiber blended yarn for clothing and its preparation method. Background Technology

[0002] Diatomaceous earth is a siliceous rock, a biogenic siliceous sedimentary rock primarily composed of the remains of ancient diatoms. Its main component is silicate, and its surface has countless tiny pores that can absorb and decompose odors in the air, providing humidity control and deodorization. Diatomaceous earth possesses characteristics such as ultra-fiber and high porosity; its ultra-micropores are 5000 to 6000 times more numerous than those of charcoal, giving it strong adsorption properties. It can automatically regulate indoor humidity; when indoor humidity rises, the ultra-micropores on diatomaceous earth automatically absorb and store moisture from the air. If the indoor air moisture decreases and humidity drops, the diatomaceous earth releases the stored moisture. Furthermore, diatomaceous earth wall materials also eliminate odors, acting as a deodorizer and maintaining indoor cleanliness. The absorption and release of moisture by diatomaceous earth wall materials creates a waterfall effect, decomposing water molecules into positive and negative ions. Positive and negative ion clusters float around in the air and have bactericidal properties; based on the advantages and benefits of diatomaceous earth, its application in home textile products will have broader application value.

[0003] Patent CN107326466A discloses a method for preparing diatomaceous earth fibers. The method involves physically and mechanically pulverizing diatomaceous earth to a particle size of 400-800 mesh (18-38 μm), followed by surface chemical treatment for modification. The modified diatomaceous earth powder is then added to the melt spinning process to obtain diatomaceous earth fibers. However, 400-800 mesh powder is still relatively fine (18-38 μm) for melt spinning solutions; generally, fiber dyes can achieve a fineness of 15-25 μm. Therefore, it tends to aggregate during melt spinning, easily leading to uneven fiber fineness, resulting in uneven fiber strength and making spinning difficult.

[0004] With the continuous development of the textile industry and the continuous improvement of people's living standards, people have a more urgent desire and higher requirements for comfortable and functional home textile products. Blending has become one of the development trends of textile fabrics. There are many ways and methods of blending, such as blending natural fibers, blending functional fibers, blending chemical fibers and natural fibers, etc., so that they are intertwined to obtain multifunctional yarns or textile fabrics.

[0005] However, existing conventional fiber blended yarns cannot meet the comprehensive performance requirements in terms of mosquito repellency, yarn strength, skin-friendliness, and moisture absorption and wicking. Therefore, how to prepare a mosquito-repellent and skin-friendly fiber blended yarn for clothing that is more suitable for home textile products is a question we need to study.

[0006] To this end, we have developed a blended yarn of mosquito-repellent and skin-friendly fiber for clothing that exhibits excellent overall performance in terms of mosquito repellency, yarn strength, skin-friendliness, and moisture absorption and wicking. Summary of the Invention

[0007] This invention addresses the problems existing in the prior art by providing a mosquito-repellent and skin-friendly blended yarn for clothing. This yarn is made by blending two types of man-made fibers (modified viscose fiber and multifunctional diatomaceous earth fiber), maintaining good antibacterial and adsorption properties. Its moisture absorption and quick-drying properties are significantly improved, resulting in excellent skin-friendliness and making it a better raw material for clothing fabrics. Furthermore, it has a good and long-lasting mosquito-repellent effect, maintaining excellent mosquito-repellent properties even after 20 washes. It also has high tensile strength and good mechanical properties.

[0008] The present invention utilizes a special multifunctional diatomaceous earth fiber to address the problems of existing diatomaceous earth chemical fiber melt spinning, such as easy aggregation, spinning difficulties, and the inability to simultaneously achieve antibacterial, adsorption, and moisture-wicking properties. The present invention proposes a multifunctional diatomaceous earth fiber and its preparation method, which features high-quality finished fiber filaments, good antibacterial and adsorption properties, and excellent comprehensive performance.

[0009] To achieve the above objectives, the present invention proposes the following technical solution:

[0010] A mosquito-repellent and skin-friendly fiber blended yarn for clothing, wherein the mosquito-repellent and skin-friendly fiber blended yarn for clothing is composed of 65-75 parts by weight of modified viscose fiber and 35-40 parts by weight of multifunctional diatomaceous earth fiber.

[0011] The mosquito-repellent and skin-friendly blended yarn for clothing of this invention is made by blending two kinds of man-made fibers (modified viscose fiber and multifunctional diatomaceous earth fiber). It still maintains good antibacterial properties and good adsorption properties; the moisture absorption and quick-drying properties are greatly improved, making it more skin-friendly and a better raw material for clothing fabrics; it has a good mosquito-repellent effect and a long duration, and still maintains a good mosquito-repellent effect after 20 washes; it also has high tensile strength and good mechanical properties.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme, the mosquito-repellent and skin-friendly fiber blended yarn for clothing is made of 70 parts by weight of modified viscose fiber and 37.5 parts by weight of multifunctional diatomaceous earth fiber.

[0013] Based on the above scheme and as a preferred embodiment of the above scheme, the modified viscose fiber is made from raw materials comprising the following parts by weight:

[0014] Artemisia argyi extract 3.5-4.2 parts, pyrethrum extract 2-2.6 parts, Nepeta cataria extract 1.5-2 parts, ultrafine diatomaceous earth 8-12 parts, viscose spinning solution 100 parts.

[0015] Based on the above scheme and as a preferred embodiment of the above scheme, the method for preparing the modified viscose fiber includes the following steps:

[0016] 1) Preparation of ultrafine diatomaceous earth

[0017] Diatomaceous earth calcined at 800℃ was selected for fine treatment and ball milling was performed using wet ball milling with deionized water as the dispersion medium and 10% of the diatomaceous earth mass as a mixed dispersant. The ball milling ratio was 7:1. The resulting mixed solution was precipitated for 6 hours, the supernatant was taken, and then precipitated for another 12 hours. The precipitate was then taken, dried, and ground to obtain ultrafine diatomaceous earth.

[0018] 2) Dilute the Artemisia argyi extract, pyrethrum extract and Nepeta cataria extract with 2 times their weight of anhydrous ethanol, mix well, and then add ultrafine diatomaceous earth and stir continuously for 1-2 hours.

[0019] 3) Then add it to the viscose spinning solution and mix evenly. After spinning, the modified viscose fiber is obtained.

[0020] Based on the above scheme and as a preferred embodiment of the above scheme, the multifunctional diatomaceous earth fiber includes a core and a fixed number of covering filaments, wherein the core comprises a number of polyester-based fiber filaments arranged in parallel.

[0021] The coating filament is a modified ultrafine diatomaceous earth fiber, and several of the modified ultrafine diatomaceous earth fibers are spirally wound around the outer surface of the filament core.

[0022] Based on the above scheme and as a preferred embodiment of the above scheme, the polyester-based fiber filament is a polyester-based diatomaceous earth fiber filament, and the polyester-based diatomaceous earth fiber filament is arranged in parallel in three strands; the modified ultrafine diatomaceous earth fiber filament is arranged in parallel in four strands.

[0023] Based on the above scheme and as a preferred embodiment of the above scheme, the method for preparing a multifunctional diatomaceous earth fiber includes the following steps:

[0024] 1) Preparation of ultrafine diatomaceous earth

[0025] Diatomaceous earth calcined at 800℃ was selected for fine treatment and ball milling was performed using wet ball milling with deionized water as the dispersion medium and 10% of the diatomaceous earth mass as a mixed dispersant. The ball milling ratio was 7:1. The resulting mixed solution was precipitated for 6 hours, the supernatant was taken, and then precipitated for another 12 hours. The precipitate was then taken, dried, and ground to obtain ultrafine diatomaceous earth.

[0026] 2) Preparation of polyester-based fiber filaments

[0027] Weigh the ultrafine diatomaceous earth described in step 1), and blend and melt it with polyester at a mass ratio of 5-30:100 to obtain a spinning solution. The spinning solution is extruded through a screw extruder and then enters a spinneret. The resulting fiber is then subjected to “stretching → washing → spraying with polyether moisture-wicking finishing agent → six-stage baking” to obtain polyester-based fiber filament.

[0028] 3) Preparation of modified ultrafine diatomaceous earth fibers

[0029] Place the ultrafine diatomaceous earth from step 1) in deionized water and add a 20%-50% polyacrylamide solution. Stir the mixture evenly in a water bath at 40℃-70℃. Then, add an appropriate amount of ammonia water dropwise at a rate of 0.5mL / min and continue stirring evenly for 1-5 hours. After soaking for 10-24 hours, dry the precipitate to obtain modified ultrafine diatomaceous earth, and grind it for later use.

[0030] Modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent are added to polyvinyl alcohol solution and magnetically stirred until uniform. After ultrasonic treatment for 20-50 minutes, the suspension is taken and wet-spun to obtain modified ultrafine diatomaceous earth fiber filaments.

[0031] 4) Preparation of multifunctional diatomaceous earth fibers

[0032] Polyester-based fiber filaments and modified ultrafine diatomaceous earth fiber filaments are simultaneously fed into a filament cutter, a first roller, a pre-network, an anti-twist device, a deformation heat box, a cooling plate, a false twister, a second roller, a main networker, a shaping heat box oil wheel, and then wound to obtain the multifunctional diatomaceous earth fiber of the present invention.

[0033] The draw ratio of the second roller to the first roller is 1.015-1.7325, and the winding speed of the second roller is -3.9%.

[0034] Based on the above scheme and as a preferred option, the calcination time of the diatomaceous earth in step 1) is 25-120 min.

[0035] Based on the above scheme and as a preferred embodiment of the above scheme, the mixing dispersant in step 1) is a mixture of acrylate, maleic isool diester, and polyvinylpyrrolidone in a mass ratio of 2:1:2.

[0036] Based on the above scheme and as a preferred embodiment of the above scheme, the molecular weight of the polyvinylpyrrolidone in step 1) is 130000 g / mol.

[0037] Based on the above scheme and as a preferred embodiment of the above scheme, the particle size of the ultrafine diatomite in step 1) is 500nm-900nm.

[0038] Based on the above scheme and as a preferred embodiment of the above scheme, the cross-section of the spinneret micro-hole in step 2) is one of a hollow circle, a hollow trilobal shape, or a hollow cross shape.

[0039] Based on the above scheme and as a preferred embodiment of the above scheme, in step 3), the mass fraction concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; the concentration of the ammonia solution is 0.5-10M; and the drying temperature of the precipitate is the same as the water bath temperature.

[0040] Based on the above scheme and as a preferred embodiment of the above scheme, the wet spinning step in step 3) is as follows:

[0041] A 15% (w / w) aqueous solution of polyvinyl alcohol was prepared, ultrasonically treated for 20 min, and then magnetically stirred and heated at 85℃-120℃ for 2 h. Modified ultrafine diatomaceous earth and a polyether-based moisture-wicking finishing agent were added to the prepared polyvinyl alcohol solution at a mass ratio of 4:1. The solution was magnetically stirred for 1 h, ultrasonically treated for 30 min, and then allowed to cool to room temperature before emulsion spinning. The wet spinning process parameters were as follows:

[0042] Spinning solution: concentration 16%;

[0043] Metering pump: 0.8 mL / r;

[0044] Rotational speed: 38 r / min;

[0045] Pump flow rate: 30 mL / min;

[0046] Spinneret has 1000 holes; hole diameter: 0.08 mm.

[0047] The coagulation bath length is 1.2m, the coagulation time is 15 seconds, and the fiber generation speed in the coagulation bath is 6m / min.

[0048] Guide wire disc diameter: 80mm;

[0049] First roller speed: 18 r / min (4.8 m / min); Second roller speed: 25 r / min (stretching 1.4 times);

[0050] Moist heat stretching temperature: 120-150℃.

[0051] This invention also provides a method for producing a mosquito-repellent and skin-friendly fiber blended yarn for clothing, comprising the following steps:

[0052] 1) Modified viscose fiber and multifunctional diatomaceous earth fiber are mixed to form cotton rolls;

[0053] 2) Then, the yarn is sequentially processed through carding, drawing, roving, spinning and winding to obtain the mosquito-repellent and skin-friendly fiber blended yarn for clothing described in this invention.

[0054] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0055] The mosquito-repellent and skin-friendly fiber blended yarn for clothing of the present invention is made by blending two kinds of man-made fibers. It still maintains good antibacterial properties and good adsorption properties. The moisture absorption and quick-drying properties are greatly improved, making it more skin-friendly and a better raw material for clothing fabrics. It also has a good mosquito-repellent effect that lasts for a long time, and it still maintains a good mosquito-repellent effect after 20 washes. In addition, it has high tensile strength and good mechanical properties.

[0056] The modified viscose fiber used in this invention, through the addition of Artemisia argyi extract, pyrethrum extract, and Nepeta cataria extract, works synergistically to achieve a significant mosquito-repellent effect in the modified viscose fiber and the final blended yarn, while also possessing certain antibacterial properties. Furthermore, the addition of self-made ultrafine diatomaceous earth, with its large specific surface area and porosity, and its abundance of silanol groups, effectively adsorbs the mosquito-repellent components from the Artemisia argyi extract, pyrethrum extract, and Nepeta cataria extract. This allows for the slow release of these extracts, ensuring a long-lasting mosquito-repellent effect. Additionally, the self-made ultrafine diatomaceous earth's excellent adsorption properties further enhance its moisture absorption and quick-drying properties, as well as its ability to eliminate sweat odor. Furthermore, the modified viscose fiber used in this invention, along with extracts of Artemisia argyi, pyrethrum, and Nepeta cataria, is easily and evenly dispersed in the viscose components, and the components have good compatibility, thus ensuring the mechanical properties of this invention. The use of wet spinning avoids the high-temperature volatilization or decomposition of mosquito-repellent components in Artemisia argyi, pyrethrum, and Nepeta cataria extracts, maximizing the mosquito-repellent effect and other comprehensive performance of the final product.

[0057] This invention utilizes a special multifunctional diatomaceous earth fiber and its preparation method. The multifunctional diatomaceous earth fiber uses irregularly shaped polyester-based multifunctional diatomaceous earth fiber filaments as the core and modified ultrafine diatomaceous earth fiber filaments as the covering filaments. The core filaments are lightweight, high-strength, and warm. Combined with the synergistic effect of moisture-wicking finishing agents and diatomaceous earth, the moisture absorption and quick-drying properties of the multifunctional diatomaceous earth fiber are effectively improved. The modified ultrafine diatomaceous earth fiber filaments exhibit good structural stability and high adsorption capacity. Using the multifunctional diatomaceous earth fiber preparation method of this invention, the resulting fiber filaments possess high quality, good antibacterial adsorption properties, and excellent overall performance.

[0058] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered part of the subject matter disclosure of the present invention, provided that such concepts do not contradict each other.

[0059] The foregoing and other aspects, embodiments, and features of the teachings of this invention will be more fully understood from the following description. Other additional aspects of the invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of this invention. Attached Figure Description

[0060] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0061] Figure 1 This is a schematic diagram of the multifunctional diatomaceous earth fiber structure described in this invention;

[0062] Figure 2 Example 1 is the specific surface area test and analysis of ultrafine diatomaceous earth.

[0063] In the diagram, 1 represents polyester-based fiber filaments; 2 represents coated filaments. Detailed Implementation

[0064] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this invention pertains.

[0065] The terms "first," "second," and similar words used in the specification and claims of this patent application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" mean that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0066] Diatomaceous earth's main component is silicon dioxide, which possesses strong adsorption properties and exhibits negative charge due to the presence of numerous silanol groups on its surface, allowing it to effectively adsorb metals and organic polymers. The varying composition and content of diatomaceous earth result in different appearances and microstructures, with porosities ranging from 80% to 90%, thus contributing to its good water absorption. Given these advantages, the application of diatomaceous earth in home textile products is a growing trend. However, the current application of diatomaceous earth fibers is limited by issues such as uneven fiber strength and easy agglomeration during spinning. Therefore, further research on multifunctional diatomaceous earth fibers is necessary.

[0067] Viscose fiber is a major type of man-made fiber. It is produced by alkalizing natural cellulose to form alkali cellulose, which then reacts with carbon disulfide to form cellulose xanthate. The resulting viscous solution, dissolved in a dilute alkali solution, is called viscose. Viscose undergoes wet spinning and a series of processing steps to become viscose fiber. Viscose is a cellulose fiber produced from cotton or other natural fibers. Among the 12 major textile fibers, viscose has the moisture content that best meets the physiological requirements of human skin, and it is characterized by its smoothness, coolness, breathability, antistatic properties, UV protection, and vibrant colors.

[0068] Mugwort has a close relationship with Chinese life. During the Dragon Boat Festival, people place mugwort in their homes to ward off evil spirits. Mugwort stalks are soaked in water for fumigation to disinfect and relieve itching. Newborns and postpartum women often use mugwort water for bathing or fumigation. Mugwort leaves are one of the few medicinal herbs mentioned in the *Huangdi Neijing* (Yellow Emperor's Inner Classic). The classic Chinese medicine texts *Shanghan Lun* (Treatise on Cold Damage) and *Jinkui Yaolue* (Essential Prescriptions of the Golden Chamber) contain two prescriptions using mugwort: Jiao Ai Tang and Bai Ye Tang. Traditional Chinese medicine theory believes that mugwort leaves have the effects of regulating qi and blood, dispelling cold and dampness, warming the meridians, stopping bleeding, and calming the fetus. Modern experimental research has proven that mugwort leaves have antibacterial and antiviral effects; anti-asthmatic, antitussive, and expectorant effects; hemostatic and anticoagulant effects; sedative and anti-allergic effects; and hepatoprotective and choleretic effects. Pharmacological studies have found that mugwort leaves have antibacterial, antiviral, anti-asthmatic, antitussive, expectorant, anti-allergic, hemostatic, anticoagulant, and immune-enhancing effects.

[0069] The Artemisia argyi extract in this embodiment of the invention was purchased from Xi'an Changyue Botanical Chemical Co., Ltd., the Pyrethrum extract was purchased from Shanxi Yuning Biotechnology Co., Ltd., and the Nepeta cataria extract was purchased from Xi'an Changyue Biotechnology Co., Ltd.

[0070] Unless otherwise specified, the test methods or experimental methods described in the following examples are conventional methods; unless otherwise specified, the reagents and materials are obtained from conventional commercial sources or prepared by conventional methods.

[0071] Example 1

[0072] A multifunctional diatomaceous earth fiber includes a core and a fixed number of covering filaments. The core comprises a number of polyester-based fiber filaments arranged in parallel. The covering filaments are modified ultrafine diatomaceous earth fiber filaments, and a number of the modified ultrafine diatomaceous earth fiber filaments are spirally wound around the outer surface of the core.

[0073] The polyester-based fiber filament is a polyester-based diatomaceous earth fiber filament, and the polyester-based diatomaceous earth fiber filament is arranged in parallel in three strands; the modified ultrafine diatomaceous earth fiber filament is arranged in parallel in four strands.

[0074] Furthermore, the preparation method of the multifunctional diatomaceous earth fiber includes the following steps:

[0075] 1) Preparation of ultrafine diatomaceous earth

[0076] Diatomaceous earth calcined at 800℃ for 60 min was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone in a 2:1:2 (by weight) mixture, and the ball milling time was 6 h. The resulting mixed solution was allowed to precipitate for 6 h, the supernatant was collected, and then allowed to precipitate for another 12 h. The precipitate was then dried and ground to obtain ultrafine diatomaceous earth.

[0077] In this embodiment, the molecular weight of the polyvinylpyrrolidone is 130,000 g / mol.

[0078] 2) Preparation of polyester-based fiber filaments

[0079] Weigh the ultrafine diatomaceous earth described in step 1), and blend and melt it with polyester at a mass ratio of 20:100 to obtain a spinning solution. The spinning solution is extruded through a screw extruder and then enters a spinneret. The resulting fiber is then subjected to “stretching → washing → spraying with polyether moisture-wicking finishing agent → six-stage baking” to obtain polyester-based fiber filament.

[0080] 3) Preparation of modified ultrafine diatomaceous earth fibers

[0081] Place the ultrafine diatomaceous earth from step 1) in deionized water and add a 35% polyacrylamide solution. Stir the mixture evenly in a 55°C water bath. Then, add an appropriate amount of ammonia water dropwise at a rate of 0.5 mL / min to adjust the pH to 10. Continue stirring evenly for 3 hours, then soak for 15 hours. Dry the precipitate to obtain modified ultrafine diatomaceous earth, and grind it for later use.

[0082] The concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide, and the mass ratio of ultrafine diatomaceous earth to polyacrylamide is 3:1; the concentration of the ammonia solution is 2.5M; and the drying temperature of the precipitate is the same as the water bath temperature. Then, the modified ultrafine diatomaceous earth and the moisture-wicking finishing agent are added to a 15% polyvinyl alcohol aqueous solution at a mass ratio of 4:1, and magnetically stirred until homogeneous. After ultrasonic treatment for 30 minutes, the suspension is taken for wet spinning to obtain multifunctional diatomaceous earth fibers.

[0083] Modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent (QTG-410 moisture-wicking finishing agent purchased from Guangzhou Qiantai Chemical Co., Ltd.) were added to a polyvinyl alcohol solution and magnetically stirred evenly. After ultrasonic treatment for 30 minutes, the suspension was taken and wet-spun to obtain modified ultrafine diatomaceous earth fiber filaments.

[0084] 4) Preparation of multifunctional diatomaceous earth fibers

[0085] Polyester-based fiber filaments and modified ultrafine diatomaceous earth fiber filaments are simultaneously fed into a filament cutter, a first roller, a pre-network, an anti-twist device, a deformation heat box, a cooling plate, a false twister, a second roller, a main networker, a shaping heat box oil wheel, and then wound to obtain the multifunctional diatomaceous earth fiber of the present invention.

[0086] The draw ratio of the second roller to the first roller is 1.015, and the winding speed of the second roller is -3.9%.

[0087] The ultrafine diatomite in this embodiment has a particle size of 780 nm.

[0088] In step 2), the cross-section of the spinneret's micro-orifices is a hollow trilobal shape. Furthermore, in step 3), the mass fraction concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; and the drying temperature of the precipitate is the same as the water bath temperature.

[0089] Furthermore, in step 3) of this embodiment, the wet spinning step is as follows:

[0090] A 15% (w / w) aqueous solution of polyvinyl alcohol was prepared, ultrasonically treated for 20 min, and then magnetically stirred and heated at 90℃ for 2 h. Modified ultrafine diatomaceous earth and a polyether-based moisture-wicking finishing agent were added to the prepared polyvinyl alcohol solution at a mass ratio of 4:1. The solution was magnetically stirred for 1 h, ultrasonically treated for 30 min, and then the suspension was allowed to cool to room temperature before wet spinning. The wet spinning process parameters were as follows:

[0091] Spinning solution: Concentration 16% (The concentration of the spinning solution (suspension) increases due to the addition of modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent);

[0092] Metering pump: 0.8 mL / r;

[0093] Rotational speed: 38 r / min;

[0094] Pump flow rate: 30 mL / min;

[0095] Spinneret has 1000 holes; hole diameter: 0.08 mm.

[0096] The coagulation bath length is 1.2m, the coagulation time is 15 seconds, and the fiber generation speed in the coagulation bath is 6m / min.

[0097] Guide wire disc diameter: 80mm;

[0098] First roller speed: 18 r / min (4.8 m / min); Second roller speed: 25 r / min (stretching 1.4 times);

[0099] Moist heat stretching temperature: 120-150℃.

[0100] Example 2

[0101] Unlike Example 1 above, a method for preparing the multifunctional diatomaceous earth fiber includes the following steps:

[0102] 1) Preparation of ultrafine diatomaceous earth

[0103] Diatomaceous earth calcined at 800℃ for 25 min was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone in a 2:1:2 (by weight) mixture, and the ball milling time was 6 h. The resulting mixed solution was allowed to precipitate for 6 h, the supernatant was collected, and then allowed to precipitate for another 12 h. The precipitate was then dried and ground to obtain ultrafine diatomaceous earth.

[0104] In this embodiment, the molecular weight of the polyvinylpyrrolidone is 130,000 g / mol.

[0105] 2) Preparation of polyester-based fiber filaments

[0106] Weigh the ultrafine diatomaceous earth described in step 1), and blend and melt it with polyester at a mass ratio of 5:100 to obtain a spinning solution. The spinning solution is extruded through a screw extruder and then enters a spinneret. The resulting fiber is then subjected to "stretching → washing → spraying with polyether moisture-wicking finishing agent → six-stage baking" to obtain polyester-based fiber filament.

[0107] 3) Preparation of modified ultrafine diatomaceous earth fibers

[0108] Place the ultrafine diatomaceous earth from step 1) in deionized water and add a 20% polyacrylamide solution. Stir the mixture evenly in a 40°C water bath. Then, add an appropriate amount of ammonia water dropwise at a rate of 0.5 mL / min and continue stirring evenly for 1 hour. After soaking for 10 hours, dry the precipitate to obtain modified ultrafine diatomaceous earth, and grind it for later use.

[0109] The concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; the concentration of the ammonia solution is 0.5M; and the drying temperature of the precipitate is the same as the water bath temperature. Then, the modified ultrafine diatomaceous earth and polyether-based moisture-wicking finishing agent are added to a 15% polyvinyl alcohol aqueous solution at a mass ratio of 4:1, and magnetically stirred until homogeneous. After ultrasonic treatment for 20 minutes, the suspension is taken and wet-spun to obtain multifunctional diatomaceous earth fibers.

[0110] Modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent were added to a polyvinyl alcohol solution and magnetically stirred until uniform. After ultrasonic treatment for 30 minutes, the suspension was taken and wet-spun to obtain modified ultrafine diatomaceous earth fiber filaments.

[0111] 4) Preparation of multifunctional diatomaceous earth fibers

[0112] Polyester-based fiber filaments and modified ultrafine diatomaceous earth fiber filaments are simultaneously fed into a filament cutter, a first roller, a pre-network, an anti-twist device, a deformation heat box, a cooling plate, a false twister, a second roller, a main networker, a shaping heat box oil wheel, and then wound to obtain the multifunctional diatomaceous earth fiber of the present invention.

[0113] The draw ratio of the second roller to the first roller is 1.015, and the winding speed of the second roller is -3.9%.

[0114] The ultrafine diatomaceous earth in this embodiment has a particle size of 500 nm.

[0115] In step 2), the cross-section of the spinneret's micro-orifices is a hollow trilobal shape. Furthermore, in step 3), the mass fraction concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; and the drying temperature of the precipitate is the same as the water bath temperature.

[0116] Furthermore, in step 3) of this embodiment, the wet spinning step is as follows:

[0117] A 15% (w / w) aqueous solution of polyvinyl alcohol was prepared, ultrasonically treated for 20 min, and then magnetically stirred and heated at 85℃ for 2 h. Modified ultrafine diatomaceous earth and a polyether-based moisture-wicking finishing agent were added to the prepared polyvinyl alcohol solution at a mass ratio of 4:1. The solution was magnetically stirred for 1 h, ultrasonically treated for 30 min, and then allowed to cool to room temperature before emulsion spinning. The wet spinning process parameters were as follows:

[0118] Spinning solution: concentration 16%;

[0119] Metering pump: 0.8 mL / r;

[0120] Rotational speed: 38 r / min;

[0121] Pump flow rate: 30 mL / min;

[0122] Spinneret has 1000 holes; hole diameter: 0.08 mm.

[0123] The coagulation bath length is 1.2m, the coagulation time is 15 seconds, and the fiber generation speed in the coagulation bath is 6m / min.

[0124] Guide wire disc diameter: 80mm;

[0125] First roller speed: 18 r / min (4.8 m / min); Second roller speed: 25 r / min (stretching 1.4 times);

[0126] Moist heat stretching temperature: 120-150℃.

[0127] Example 3

[0128] Unlike Example 1 above, a method for preparing the multifunctional diatomaceous earth fiber includes the following steps:

[0129] 1) Preparation of ultrafine diatomaceous earth

[0130] Diatomaceous earth calcined at 800℃ for 120 min was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone in a 2:1:2 (by weight) mixture, and the ball milling time was 6 h. The resulting mixed solution was allowed to precipitate for 6 h, the supernatant was collected, and then allowed to precipitate for another 12 h. The precipitate was then dried and ground to obtain ultrafine diatomaceous earth.

[0131] In this embodiment, the molecular weight of the polyvinylpyrrolidone is 130,000 g / mol.

[0132] 2) Preparation of polyester-based fiber filaments

[0133] Weigh the ultrafine diatomaceous earth described in step 1), and blend and melt it with polyester at a mass ratio of 30:100 to obtain a spinning solution. The spinning solution is extruded through a screw extruder and then enters a spinneret. The resulting fiber is then subjected to “stretching → washing → spraying with polyether moisture-wicking finishing agent → six-stage baking” to obtain polyester-based fiber filament.

[0134] 3) Preparation of modified ultrafine diatomaceous earth fibers

[0135] Place the ultrafine diatomaceous earth from step 1) in deionized water and add a 50% polyacrylamide solution. Stir the mixture evenly in a 70°C water bath. Then, add an appropriate amount of ammonia water dropwise at a rate of 0.5 mL / min and continue stirring evenly for 5 hours. After soaking for 24 hours, dry the precipitate to obtain modified ultrafine diatomaceous earth, and grind it for later use.

[0136] The concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; the concentration of the ammonia solution is 10M; and the drying temperature of the precipitate is the same as the water bath temperature. Then, the modified ultrafine diatomaceous earth and the moisture-wicking finishing agent are added to a 15% polyvinyl alcohol aqueous solution at a mass ratio of 4:1, and magnetically stirred until homogeneous. After ultrasonic treatment for 50 minutes, the suspension is taken and wet-spun to obtain multifunctional diatomaceous earth fibers.

[0137] Modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent were added to a polyvinyl alcohol solution and magnetically stirred until uniform. After ultrasonic treatment for 30 minutes, the suspension was taken and wet-spun to obtain modified ultrafine diatomaceous earth fiber filaments.

[0138] 4) Preparation of multifunctional diatomaceous earth fibers

[0139] Polyester-based fiber filaments and modified ultrafine diatomaceous earth fiber filaments are simultaneously fed into a filament cutter, a first roller, a pre-network, an anti-twist device, a deformation heat box, a cooling plate, a false twister, a second roller, a main networker, a shaping heat box oil wheel, and then wound to obtain the multifunctional diatomaceous earth fiber of the present invention.

[0140] The draw ratio of the second roller to the first roller is 1.7325, and the winding speed of the second roller is -3.9%.

[0141] The ultrafine diatomite in this embodiment has a particle size of 900 nm.

[0142] In step 2), the cross-section of the spinneret's micro-orifices is a hollow trilobal shape. Furthermore, in step 3), the mass fraction concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; and the drying temperature of the precipitate is the same as the water bath temperature.

[0143] Furthermore, in step 3) of this embodiment, the wet spinning step is as follows:

[0144] A 15% (w / w) aqueous solution of polyvinyl alcohol was prepared, ultrasonically treated for 20 min, and then magnetically stirred and heated at 120℃ for 2 h. Modified ultrafine diatomaceous earth and a polyether-based moisture-wicking finishing agent were added to the prepared polyvinyl alcohol solution at a mass ratio of 4:1. The solution was magnetically stirred for 1 h, ultrasonically treated for 30 min, and then allowed to cool to room temperature before emulsion spinning. The wet spinning process parameters were as follows:

[0145] Spinning solution: concentration 16%;

[0146] Metering pump: 0.8 mL / r;

[0147] Rotational speed: 38 r / min;

[0148] Pump flow rate: 30 mL / min;

[0149] Spinneret has 1000 holes; hole diameter: 0.08 mm.

[0150] The coagulation bath length is 1.2m, the coagulation time is 15 seconds, and the fiber generation speed in the coagulation bath is 6m / min.

[0151] Guide wire disc diameter: 80mm;

[0152] First roller speed: 18 r / min (4.8 m / min); Second roller speed: 25 r / min (stretching 1.4 times);

[0153] Moist heat stretching temperature: 120-150℃.

[0154] Comparative Example 1

[0155] Unlike Example 1, the mixing dispersant in step 1) is replaced with an equal mass of polyvinylpyrrolidone, while the other process steps are the same.

[0156] Comparative Example 2

[0157] Unlike Example 1, in step 1), the ball milling time of the diatomaceous earth in the preparation of ultrafine diatomaceous earth is 24 hours, while the other process steps are the same.

[0158] Comparative Example 3

[0159] The difference from Example 1 is that the polyether-based moisture-wicking finishing agent is replaced with moisture-wicking finishing agent LD-9020, while the other process steps are the same.

[0160] Comparative Example 4

[0161] Unlike Example 1, in step 3), the same volume of pure ammonia solution was used to treat the ultrafine diatomaceous earth during the preparation of the modified ultrafine diatomaceous earth, while the other process steps were the same.

[0162] Comparative Example 5

[0163] Unlike Example 1, in step 3), the modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent are added to the polyethylene terephthalate solution, while the other process steps are the same.

[0164] Performance testing

[0165] 1. Antibacterial properties

[0166] The antimicrobial properties of fibers against Staphylococcus aureus, Escherichia coli and Candida albicans were tested according to GB / T 20944.3—2008 "Evaluation of antimicrobial properties of textiles - Part 3: Vibration method".

[0167] 2. Moisture-wicking properties

[0168] The finished fibers were woven into wadding sheets of the same specifications, and their moisture absorption and wicking properties were tested. The moisture permeability was measured using the ASTM E96-1995BW standard, with the temperature maintained at 23°C and relative humidity at 50% in a constant temperature and humidity chamber. The moisture permeability of Examples 1-3 and Comparative Examples 1-3 was measured.

[0169] The perspiration performance is tested according to GB / T 21655.1—2008 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", which measures water absorption rate, water droplet diffusion time and water evaporation rate.

[0170] 3. Adsorption

[0171] The finished fibers are woven into wadding sheets of the same specifications. According to QB / T 2761—2006 "Method for Determining the Purification Effect of Indoor Air Purification Products", a 100g sample of fiber wadding sheets is placed in a 1.5m... 3 The test was conducted inside the test chamber, and the change rate of ammonia gas in the chamber over 24 hours was compared to test the adsorption performance of the fiber.

[0172] In addition, particle size tests were conducted on the ultrafine diatomaceous earth samples from Example 1 and Comparative Examples 1-5. The average diameter of the particles in Comparative Example 2 was significantly larger than that of the other samples, indicating that prolonged ball milling in liquid led to more significant agglomeration of the powder, which is detrimental to the spinnability and dimensional stability of the diatomaceous earth.

[0173] Table 1 shows the test results of the finished fiber filaments of Examples 1-3 and Comparative Examples 1-5 according to different performance test requirements. The relevant test results are shown in the table below:

[0174] Table 1. Tests on the properties of finished fiber fabrics

[0175]

[0176] Based on the above data, and combined with Figure 2 The nitrogen adsorption curve in the specific surface area test analysis of ultrafine diatomaceous earth shows that the diatomaceous earth particles still exhibit adsorption properties after ball milling. Furthermore, during the preparation process of this invention, the particle size of the ultrafine diatomaceous earth ensures that the modified ultrafine multifunctional diatomaceous earth fibers remain within the spinnable fiber range.

[0177] Furthermore, a mixture of acrylate, maleic isool diester, and polyvinylpyrrolidone (PVP) in a mass ratio of 2:1:2 was selected as the dispersant for ball milling. This serves two purposes: firstly, the dispersant effect of PVP enhances the uniformity and dimensional stability of the diatomaceous earth; secondly, the amphiphilic activation effect of the acrylate and maleic isool diester mixture on the diatomaceous earth facilitates its modification, promotes hydrogen bonding between diatomaceous earth particles in aqueous solution, reduces the possibility of diatomaceous earth aggregation, and thus enhances the stability and mechanical properties of the formed fibers. Mechanical property tests were conducted on the fibers from Comparative Example 1 and Example 1. The relevant mechanical properties of Example 1 were significantly better than those of Comparative Example 1.

[0178] Analysis of the adsorption comparison test data of ammonia removal rate shows that the multifunctional diatomaceous earth fiber of the present invention has excellent adsorption performance. Moreover, the multifunctional diatomaceous earth fiber prepared by the present invention has excellent performance in moisture absorption and perspiration, antibacterial properties, etc. The reason for this is that in the preparation process, the polyacrylamide solution system under a weak alkaline atmosphere can not only achieve flocculation, but also accelerate precipitation and active adsorption, and also help polyacrylamide modify diatomaceous earth: (1) Polyacrylamide is a linear polymer. Polyacrylamide can be hydrolyzed in alkaline conditions to undergo methylation and hydroxylation reactions of amines, resulting in hydroxyl groups, which makes the surface properties of diatomaceous earth active; (2) Hydroxyl groups can be adsorbed with charged particles in the solution to maintain charge neutralization, thereby enhancing its active adsorption effect; (3) Especially in the wet spinning process of polyvinyl alcohol, diatomaceous earth with activated hydroxyl groups can accumulate and generate hydrogen bonds, etc., resulting in good stability. Adding polyacrylamide to the modified ultrafine diatomaceous earth fiber preparation system can build channel structures between fibers, increasing the contact time and contact area, thereby improving adsorption.

[0179] For polyether-based moisture-wicking finishing agents, the polymer chain structure of polyether-based moisture-wicking finishing agents is highly similar to that of polyester polymers. Therefore, they have extremely high affinity between ultrafine diatomite and polyester in polyester-based fiber filaments, between modified ultrafine diatomite in wet spinning, and between polyether-based moisture-wicking finishing agents. The compound use of polyether-based moisture-wicking finishing agents and diatomite can effectively reduce costs while ensuring moisture-wicking performance. Moreover, diatomite itself has antibacterial adsorption properties, which is conducive to the synergistic effect between moisture-wicking finishing agents and diatomite, effectively improving the moisture absorption and quick-drying properties of multifunctional diatomite fibers.

[0180] The use of polyvinyl alcohol (PVA) involves using stable heating conditions to cause PVA to lose some of its bound water, thereby disrupting intermolecular forces and reducing the impact of excessive hydroxyl groups in the wet spinning system on the stability of the fiber.

[0181] In summary, the preparation method of the multifunctional diatomaceous earth fiber of the present invention is simple to operate, uses inexpensive raw materials, and has the advantages of being green and economical. Moreover, the prepared multifunctional diatomaceous earth fiber has excellent comprehensive performance, which is conducive to its further development and application.

[0182] Example 4

[0183] A mosquito-repellent and skin-friendly fiber blended yarn for clothing, wherein the mosquito-repellent and skin-friendly fiber blended yarn for clothing is made of 65 parts by weight of modified viscose fiber and 35 parts by weight of multifunctional diatomaceous earth fiber.

[0184] The modified viscose fiber described in this embodiment is made from raw materials comprising the following parts by weight:

[0185] Artemisia argyi extract 3.5 parts, pyrethrum extract 2 parts, Nepeta cataria extract 1.5 parts, ultrafine diatomaceous earth 8 parts, viscose spinning solution 100 parts.

[0186] The method for preparing the modified viscose fiber described in this embodiment includes the following steps:

[0187] 1) Preparation of ultrafine diatomaceous earth

[0188] Diatomaceous earth calcined at 800℃ was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone mixed in a 2:1:2 (by weight) mixture, and the ball milling time was 6 hours. The resulting mixed solution was allowed to precipitate for 6 hours, the supernatant was collected, and then allowed to precipitate for another 12 hours. The precipitate was then collected, dried, and ground to obtain ultrafine diatomaceous earth.

[0189] 2) Dilute Artemisia argyi extract, Pyrethrum extract and Nepeta cataria extract with 2 times their weight of anhydrous ethanol, mix well and then add ultrafine diatomaceous earth and stir continuously for 1 hour.

[0190] 3) Then add it to the viscose spinning solution and mix evenly. After spinning, the modified viscose fiber is obtained.

[0191] The multifunctional diatomaceous earth fiber described in this embodiment is the multifunctional diatomaceous earth fiber obtained in Embodiment 2 of the present invention.

[0192] The production method of the mosquito-repellent and skin-friendly fiber blended yarn for clothing in this embodiment includes the following steps:

[0193] 1) Modified viscose fiber and multifunctional diatomaceous earth fiber are mixed to form cotton rolls;

[0194] 2) Then, the yarn is sequentially processed through carding, drawing, roving, spinning and winding to obtain the mosquito-repellent and skin-friendly fiber blended yarn for clothing described in this invention.

[0195] Example 5

[0196] A mosquito-repellent and skin-friendly fiber blended yarn for clothing, wherein the mosquito-repellent and skin-friendly fiber blended yarn for clothing is made of 75 parts by weight of modified viscose fiber and 40 parts by weight of multifunctional diatomaceous earth fiber.

[0197] The modified viscose fiber described in this embodiment is made from raw materials comprising the following parts by weight:

[0198] Artemisia argyi extract 4.2 parts, pyrethrum extract 2.6 parts, Nepeta cataria extract 2 parts, ultrafine diatomaceous earth 12 parts, viscose spinning solution 100 parts.

[0199] The method for preparing the modified viscose fiber described in this embodiment includes the following steps:

[0200] 1) Preparation of ultrafine diatomaceous earth

[0201] Diatomaceous earth calcined at 800℃ was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone mixed in a 2:1:2 (by weight) mixture, and the ball milling time was 6 hours. The resulting mixed solution was allowed to precipitate for 6 hours, the supernatant was collected, and then allowed to precipitate for another 12 hours. The precipitate was then collected, dried, and ground to obtain ultrafine diatomaceous earth.

[0202] 2) Dilute the Artemisia argyi extract, pyrethrum extract and Nepeta cataria extract with 2 times their weight of anhydrous ethanol, mix well and then add ultrafine diatomaceous earth and stir continuously for 2 hours.

[0203] 3) Then add it to the viscose spinning solution and mix evenly. After spinning, the modified viscose fiber is obtained.

[0204] The multifunctional diatomaceous earth fiber described in this embodiment is the multifunctional diatomaceous earth fiber obtained in Embodiment 3 of the present invention.

[0205] The production method of the mosquito-repellent and skin-friendly fiber blended yarn for clothing in this embodiment includes the following steps:

[0206] 1) Modified viscose fiber and multifunctional diatomaceous earth fiber are mixed to form cotton rolls;

[0207] 2) Then, the yarn is sequentially processed through carding, drawing, roving, spinning and winding to obtain the mosquito-repellent and skin-friendly fiber blended yarn for clothing described in this invention.

[0208] Example 6

[0209] A mosquito-repellent and skin-friendly fiber blended yarn for clothing, wherein the mosquito-repellent and skin-friendly fiber blended yarn for clothing is composed of 70 parts by weight of modified viscose fiber and 37.5 parts by weight of multifunctional diatomaceous earth fiber.

[0210] The modified viscose fiber described in this embodiment is made from raw materials comprising the following parts by weight:

[0211] Artemisia argyi extract 3.85 parts, pyrethrum extract 2.3 parts, Nepeta cataria extract 1.75 parts, ultrafine diatomaceous earth 10 parts, viscose spinning solution 100 parts.

[0212] The method for preparing the modified viscose fiber described in this embodiment includes the following steps:

[0213] 1) Preparation of ultrafine diatomaceous earth

[0214] Diatomaceous earth calcined at 800℃ was selected for refining treatment. It was then ball-milled using a wet ball milling method with deionized water as the dispersion medium and a 10% (by weight) mixed dispersant (a ball-to-material ratio of 7:1). The mixed dispersant consisted of acrylate, maleic isool diester, and polyvinylpyrrolidone mixed in a 2:1:2 (by weight) mixture, and the ball milling time was 6 hours. The resulting mixed solution was allowed to precipitate for 6 hours, the supernatant was collected, and then allowed to precipitate for another 12 hours. The precipitate was then collected, dried, and ground to obtain ultrafine diatomaceous earth.

[0215] 2) Dilute the Artemisia argyi extract, pyrethrum extract and Nepeta cataria extract with 2 times their weight of anhydrous ethanol, mix well, and then add ultrafine diatomaceous earth and stir continuously for 1-2 hours.

[0216] 3) Then add it to the viscose spinning solution and mix evenly. After spinning, the modified viscose fiber is obtained.

[0217] The multifunctional diatomaceous earth fiber described in this embodiment is the multifunctional diatomaceous earth fiber obtained in Embodiment 1 of the present invention.

[0218] The production method of the mosquito-repellent and skin-friendly fiber blended yarn for clothing in this embodiment includes the following steps:

[0219] 1) Modified viscose fiber and multifunctional diatomaceous earth fiber are mixed to form cotton rolls;

[0220] 2) Then, the yarn is sequentially processed through carding, drawing, roving, spinning and winding to obtain the mosquito-repellent and skin-friendly fiber blended yarn for clothing described in this invention.

[0221] Comparative Example 6

[0222] Unlike Example 6, the modified viscose fiber is a viscose fiber obtained by spinning the viscose spinning solution alone. The raw material composition does not contain Artemisia argyi extract, pyrethrum extract, Nepeta cataria extract, or ultrafine diatomaceous earth. Other process steps are the same.

[0223] Comparative Example 7

[0224] Unlike Example 6, the modified viscose fiber raw material composition does not contain Artemisia argyi extract, but the other process steps are the same.

[0225] Comparative Example 8

[0226] Unlike Example 6, the modified viscose fiber raw material composition does not contain pyrethrum extract, but the other process steps are the same.

[0227] Comparative Example 9

[0228] Unlike Example 6, the modified viscose fiber raw material composition does not contain catnip extract, but the other process steps are the same.

[0229] Comparative Example 10

[0230] Unlike Example 6, the modified viscose fiber raw material composition does not contain ultrafine diatomaceous earth, but the other process steps are the same.

[0231] Comparative Example 11

[0232] Unlike Example 6, the multifunctional diatomaceous earth fiber is replaced with pure polyester fiber, while the other process steps are the same.

[0233] Performance testing

[0234] 1. Antibacterial properties

[0235] The antimicrobial properties of fibers against Staphylococcus aureus, Escherichia coli and Candida albicans were tested according to GB / T 20944.3—2008 "Evaluation of antimicrobial properties of textiles - Part 3: Vibration method".

[0236] 2. Moisture-wicking properties

[0237] The finished fibers were woven into wadding sheets of the same specifications, and their moisture absorption and wicking properties were tested. The moisture permeability was measured using the ASTM E96-1995BW standard, with the temperature maintained at 23°C and relative humidity at 50% in a constant temperature and humidity chamber. The moisture permeability of Examples 1-3 and Comparative Examples 1-3 was measured.

[0238] The perspiration performance is tested according to GB / T 21655.1—2008 "Evaluation of the moisture absorption and quick-drying properties of textiles - Part 1: Single combination test method", which measures water absorption rate, water droplet diffusion time and water evaporation rate.

[0239] 3. Adsorption

[0240] The finished fibers are woven into wadding sheets of the same specifications. According to QB / T 2761—2006 "Method for Determining the Purification Effect of Indoor Air Purification Products", a 100g sample of fiber wadding sheets is placed in a 1.5m... 3 The test was conducted inside the test chamber, and the change rate of ammonia gas in the chamber over 24 hours was compared to test the adsorption performance of the fiber.

[0241] 4. Mosquito repellency performance (repellency method) test

[0242] The procedure was performed according to GB / T 30126-2013, specifically as follows: 10 mL of blood was added to the feeding box of the blood-sucking insect donor device, and the blood was sealed with an artificial membrane. The non-woven fabric prepared in the comparative and example samples was then placed over the artificial membrane of the feeding box. The blood temperature was set to 36°C using a temperature controller. When the blood temperature reached the set temperature of 36°C, the feeding box was placed at the bottom of a mosquito cage containing 300 female mosquitoes. The number of mosquitoes that landed on the surface of the test sample and the control sample after 2 minutes was counted.

[0243] Mosquito repellency rate is calculated using the following formula:

[0244] Mosquito repellency rate (%) = (Ac - Ai) / Ac × 100%

[0245] Wherein, Ai represents the number of mosquitoes repelled by the nonwoven fabric in the embodiments and comparative examples of the present invention, and Ac represents the number of mosquitoes repelled by the cotton lining fabric used as a control sample, which was treated according to the standard (GB_T30126-2013).

[0246] The measurement was repeated three times, and the average value was taken as the final result. The higher the repellency rate, the stronger the mosquito repellency ability.

[0247] 5. Yarn tensile strength

[0248] The test was conducted according to GB / T 3916-2013 "Determination of breaking strength and elongation at break of single yarn in packaged textiles".

[0249] Table 2 shows the test results of the finished blended yarns of Examples 3-6 and Comparative Examples 6 and 11 according to different performance test requirements. The relevant test results are shown in the table below:

[0250] Table 2. Fabric properties tests of finished blended yarns from Examples 3-6 and Comparative Examples 6 and 11.

[0251]

[0252] As can be seen from the above data, the finished blended yarn fabric of the present invention, after being blended with two kinds of man-made fibers, still maintains good antibacterial properties and good adsorption properties; the moisture absorption and quick-drying properties are greatly improved, resulting in good skin-friendliness and making it a better raw material for clothing fabrics.

[0253] Table 3 shows the test results of the finished blended yarns of Examples 3-6 and Comparative Examples 6-11 according to different performance test requirements. The relevant test results are shown in the table below:

[0254] Table 3. Fabric properties tests of finished blended yarns from Examples 3-6 and Comparative Examples 6-11

[0255]

[0256] As can be seen from the above data, the finished blended yarn fabric of the present invention has a good mosquito-repellent effect and a long duration. It still maintains a good mosquito-repellent effect after 20 washes. It also has high tensile strength and good mechanical properties, making it suitable for use as clothing fabric.

[0257] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A mosquito-repellent and skin-friendly fiber blended yarn for clothing, characterized in that: The mosquito-repellent and skin-friendly fiber blended yarn for clothing is made of 65-75 parts by weight of modified viscose fiber and 35-40 parts by weight of multifunctional diatomaceous earth fiber. The multifunctional diatomaceous earth fiber includes a core and a fixed number of covering filaments. The core is composed of a number of polyester-based fiber filaments arranged in parallel. The coating filament is a modified ultrafine diatomaceous earth fiber filament, and several of the modified ultrafine diatomaceous earth fiber filaments are spirally wound around the outer surface of the filament core. The modified viscose fiber is made from the following raw materials in parts by weight: 3.5-4.2 parts of Artemisia argyi extract, 2-2.6 parts of pyrethrum extract, 1.5-2 parts of Nepeta cataria extract, 8-12 parts of ultrafine diatomaceous earth, and 100 parts of viscose spinning solution; the preparation method of the multifunctional diatomaceous earth fiber includes the following steps: 1) Preparation of ultrafine diatomaceous earth Diatomaceous earth calcined at 800℃ was selected for fine treatment and ball milling was performed using wet ball milling with deionized water as the dispersion medium and 10% of the diatomaceous earth mass as a mixed dispersant. The ball milling ratio was 7:

1. The resulting mixed solution was precipitated for 6 hours, the supernatant was taken, and then precipitated for another 12 hours. The precipitate was then taken, dried, and ground to obtain ultrafine diatomaceous earth. 2) Preparation of polyester-based fiber filaments Weigh the ultrafine diatomaceous earth described in step 1), and blend and melt it with polyester at a mass ratio of 5-30:100 to obtain a spinning solution. The spinning solution is extruded through a screw extruder and then enters a spinneret. The resulting fiber is then subjected to "stretching → washing → spraying with polyether moisture-wicking finishing agent → six-stage baking" to obtain polyester-based fiber filament. 3) Preparation of modified ultrafine diatomaceous earth fibers Place the ultrafine diatomaceous earth from step 1) in deionized water, and add a 20%-50% polyacrylamide solution. Stir the mixture evenly in a water bath at 40℃-70℃. Then, add an appropriate amount of ammonia water dropwise at a rate of 0.5mL / min and continue stirring evenly for 1-5 hours. After soaking for 10-24 hours, dry the precipitate to obtain modified ultrafine diatomaceous earth, and grind it for later use. Modified ultrafine diatomaceous earth and polyether moisture-wicking finishing agent are added to polyvinyl alcohol solution and magnetically stirred until uniform. After ultrasonic treatment for 20-50 minutes, the suspension is taken and wet-spun to obtain modified ultrafine diatomaceous earth fiber filaments. 4) Preparation of multifunctional diatomaceous earth fibers Polyester-based fiber filaments and modified ultrafine diatomaceous earth fiber filaments are simultaneously fed into a filament cutter, a first roller, a pre-network, an anti-twist device, a deformation heat box, a cooling plate, a false twister, a second roller, a main networker, a shaping heat box oil wheel, and then wound to obtain multifunctional diatomaceous earth fiber. The draw ratio of the second roller to the first roller is 1.015-1.7325, and the winding speed is -3.9% of the winding ratio of the second roller.

2. The mosquito-repellent and skin-friendly blended yarn for clothing according to claim 1, characterized in that, The mosquito-repellent and skin-friendly fiber blended yarn for clothing is made of 70 parts by weight of modified viscose fiber and 37.5 parts by weight of multifunctional diatomaceous earth fiber.

3. The mosquito-repellent and skin-friendly fiber blended yarn for clothing according to claim 1, characterized in that, The preparation method of the modified viscose fiber includes the following steps: 1) Preparation of ultrafine diatomaceous earth Diatomaceous earth calcined at 800℃ was selected for fine treatment and ball milling was performed using wet ball milling with deionized water as the dispersion medium and 10% of the diatomaceous earth mass as a mixed dispersant. The ball milling ratio was 7:

1. The resulting mixed solution was precipitated for 6 hours, the supernatant was taken, and then precipitated for another 12 hours. The precipitate was then taken, dried, and ground to obtain ultrafine diatomaceous earth. 2) Dilute the Artemisia argyi extract, pyrethrum extract and Nepeta cataria extract with 2 times their weight of anhydrous ethanol, mix well, and then add ultrafine diatomaceous earth and stir continuously for 1-2 hours. 3) Then add it to the viscose spinning solution and mix evenly. After spinning, the modified viscose fiber is obtained.

4. The mosquito-repellent and skin-friendly fiber blended yarn for clothing according to claim 1, characterized in that, The polyester-based fiber filament is a polyester-based diatomaceous earth fiber filament, and three polyester-based diatomaceous earth fiber filaments are arranged side by side; four modified ultrafine diatomaceous earth fiber filaments are arranged side by side.

5. The mosquito-repellent and skin-friendly fiber blended yarn for clothing according to claim 1, characterized in that, In the preparation method of the multifunctional diatomaceous earth fiber, the calcination time of the diatomaceous earth in step 1) is 25-120 min; the mixing dispersant in step 1) of the preparation method of the multifunctional diatomaceous earth fiber is a mixture of acrylate, maleic isool diester, and polyvinylpyrrolidone in a mass ratio of 2:1:2; the molecular weight of the polyvinylpyrrolidone in step 1) of the preparation method of the multifunctional diatomaceous earth fiber is 130000 g / mol; and the particle size of the ultrafine diatomaceous earth in step 1) of the preparation method of the multifunctional diatomaceous earth fiber is 500 nm-900 nm.

6. The mosquito-repellent and skin-friendly fiber blended yarn for clothing according to claim 1, characterized in that, Step 2) The cross-section of the spinneret micro-orifice in the spinneret is one of a hollow circle, a hollow trilobal shape, or a hollow cross shape.

7. The mosquito-repellent and skin-friendly fiber blended yarn for clothing according to claim 1, characterized in that, Step 3) The mass fraction concentration of the ultrafine diatomaceous earth is the same as the concentration of polyacrylamide; the concentration of the ammonia solution is 0.5-10M; the drying temperature of the precipitate is the same as the water bath temperature; Step 3) The wet spinning step is as follows: A 15% (w / w) aqueous solution of polyvinyl alcohol was prepared, ultrasonically treated for 20 min, and then magnetically stirred and heated at 85℃-120℃ for 2 h. Modified ultrafine diatomaceous earth and a polyether-based moisture-wicking finishing agent were added to the prepared polyvinyl alcohol solution at a mass ratio of 4:

1. The solution was magnetically stirred for 1 h, ultrasonically treated for 30 min, and then allowed to cool to room temperature before emulsion spinning. The wet spinning process parameters were as follows: Spinning solution: concentration 16%; Metering pump: 0.8 mL / r; Rotational speed: 38 r / min; Pump flow rate: 30 mL / min; The number of spinneret holes is 1000; Hole diameter: 0.08mm; The coagulation bath length is 1.2m, the coagulation time is 15 seconds, and the fiber generation speed in the coagulation bath is 6m / min. Guide wire disc diameter: 80mm; Roller speed: 18 r / min; Roller speed: 25 r / min; Moist heat stretching temperature: 120-150℃.

8. A method for producing a mosquito-repellent and skin-friendly blended yarn for clothing according to any one of claims 1-7, characterized in that, Includes the following steps: 1) Modified viscose fiber and multifunctional diatomaceous earth fiber are mixed to form cotton rolls; 2) Then, the yarn is successively processed through carding, drawing, roving, spinning and winding to obtain the aforementioned mosquito-repellent and skin-friendly fiber blended yarn for clothing.

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