A high-elasticity, high-hygroscopicity and antibacterial yarn and its preparation method

Abstract

The present invention discloses a high-elasticity, high-hygroscopicity, antibacterial yarn and a preparation method thereof. The high-elasticity, high-hygroscopicity, antibacterial yarn comprises a core yarn and a surface layer. The core yarn has a single fiber fineness of 3.5 to 5.0 dtex and comprises an inner core and a core layer. The inner core is formed of regenerated soybean protein fiber with a porosity of 20 to 30% and a single fiber fineness of 1.5 to 2.5 dtex. The core layer is a composite fiber spirally twisted from spandex fiber, polyester fiber, and high-hygroscopicity fiber. The core layer has an elliptical cross-section and is spirally twisted on the surface of the inner core. The surface layer is twisted from skin-friendly fibers and is spirally wrapped around the surface of the core yarn in a direction opposite to that of the composite fibers. The present invention has excellent elasticity, moisture absorption and breathability, and antibacterial effects. It can effectively improve the wearing comfort of fabrics woven using the yarn and is particularly suitable as a raw material yarn for sportswear fabrics.

Description

Technical Field

[0001] The present invention relates to yarn processing technology in the field of textile technology, and in particular to a high-elasticity, high-hygroscopicity and antibacterial yarn and a preparation method thereof. Background Art

[0002] Yarn is a soft, slender fiber aggregate with certain mechanical properties formed by the aggregation of various textile fibers along the length direction. It is also the most important and basic material for fabric production today and can be widely used in textile operations such as weaving, rope making, thread making, knitting, and embroidery. With the advancement of textile technology and the improvement of people's pursuit of quality of life, people's demand for various daily necessities is becoming more and more diversified. The requirements for fabrics are not limited to comfort. At the same time, people also hope that fabrics or fibers have some functionality. Yarns with corresponding enhanced functions have inherent advantages in the development of textile fabrics, which can contribute to the functionalization, comfort and high-end treatment of textile fabrics.

[0003] In recent years, people's demand for physical health has become increasingly high. With the increase in time spent outdoors, the demand for sportswear fabrics has been growing. This type of sportswear fabric is usually close-fitting fabric. In addition to having excellent skin-friendly properties, breathability, and thermal insulation properties, it also requires strong elasticity and hygroscopicity. The elasticity is mainly used to make the fabric fit the human body surface after cutting, thereby utilizing the elastic recovery force of the fabric to provide protection and shaping effects during exercise; while the hygroscopicity is used to quickly expel sweat during exercise and reduce the feeling of stuffiness on the skin surface. To achieve these effects, the yarns used to weave these fabrics are usually cotton fibers, polyester fibers, and spandex. The performance of these fibers themselves is unsatisfactory and it is difficult to meet the growing demand. At the same time, after the yarn absorbs moisture, the fibers swell laterally, closing the gaps between the yarns, resulting in slow water dissipation. The absorbed moisture cannot diffuse outward. The slow water dissipation rate is also very easy to breed bacteria in warm environments or if it is not dried or air-dried in time. Summary of the Invention

[0004] The technical problem solved by the present invention is to provide a high-elasticity, high-hygroscopicity and antibacterial yarn and a preparation method thereof to solve the defects in the above technical background.

[0005] The technical problem solved by the present invention is achieved by adopting the following technical solutions:

[0006] A high-elasticity, high-hygroscopicity and antibacterial yarn, comprising a core yarn and a surface layer;

[0007] The core yarn has a single fiber fineness of 3.5 to 5.0 dtex and includes an inner core and a core covering layer, and the gap between the inner core and the core covering layer is filled with a nano-antibacterial material. The inner core is a regenerated soybean protein fiber with a porosity of 20 to 30%, and the single fiber fineness of the inner core is 1.5 to 2.5 dtex. The core covering layer is formed on the surface of the inner core and is tightly spirally wrapped with a composite fiber on the entire surface of the inner core. The composite fiber is spirally twisted by 7 to 11% spandex fiber, 50 to 60% polyester fiber, and the remainder high moisture absorption fiber. The composite fiber has an elliptical cross-section, and the ratio of the major axis to the minor axis of the elliptical cross-section is 3:2 to 2:1, and the elliptical cross-section is tangent to the inner core in the long side direction.

[0008] The surface layer is formed by twisting skin-friendly fibers and is formed by spirally wrapping on the surface of the core wire in a manner opposite to the winding direction of the composite fibers.

[0009] As a further limitation, the regenerated soy protein fiber in the core wire is prepared by: bleaching the soy protein fiber and then soaking it in a constant temperature water bath with warm water, and then rapidly cooling it after soaking in the warm water bath to form structurally stable small-sized gap channels and spaces inside the fiber.

[0010] As a further limitation, the nano antibacterial materials are silver ions and nano titanium dioxide.

[0011] As a further limitation, the skin-friendly fiber is one of cotton fiber, linen fiber, bamboo fiber, wool fiber, or a mixture of cotton fiber, linen fiber, bamboo fiber, wool fiber and modal, polyester fiber, spandex, or lycra in any proportion.

[0012] As a further limitation, the skin-friendly fibers are pre-soaked in a solution of sodium bromide and polyvinyl alcohol before being twisted on the core covering layer to obtain better surface hydrophilicity.

[0013] A method for preparing a high-elasticity, high-hygroscopicity, and antibacterial yarn, which is used to prepare the high-elasticity, high-hygroscopicity, and antibacterial yarn having the above technical characteristics, specifically comprises the following steps:

[0014] 1) Bleaching the soybean protein fiber, adding the bleached soybean protein fiber into warm water at 50-60° C. and soaking it at a constant temperature for 1-2 hours, then taking it out and putting it into ice water for rapid cooling to obtain regenerated soybean protein fiber.

[0015] 2) 70-80% of the regenerated soybean protein fiber and the remaining water-soluble vinylon staple fiber are twisted in proportion to form an inner core monofilament, and the twisted inner core monofilament is added to hot water for a water bath devitrification treatment. During the devitrification, the hot water temperature is controlled to be 8-15° C. higher than the dissolution water temperature of the water-soluble vinylon staple fiber, and the devitrification bath ratio is controlled to be 1:15-1:20, and the devitrification time is controlled to be 30-45 minutes; after the devitrification is completed, the inner core is obtained.

[0016] 3) Spandex fiber, polyester fiber and high moisture absorption fiber that meet the mass ratio conditions are twisted in proportion to form a composite fiber, and during the twisting process, the composite fiber bundle is passed through an elliptical cross-section die to obtain an elliptical cross-section composite fiber bundle, and the composite fiber bundle is twisted spirally on the surface of the inner core to obtain a core wire.

[0017] 4) The core wire obtained in step 3) is immersed in a nano-antibacterial material impregnation solution, and then washed with running water to remove the surface slurry and then dried with hot air to obtain the treated core wire.

[0018] 5) A layer of skin-friendly fiber is twisted in a Z-twist direction on the outer surface of the core layer obtained in step 4) as a surface layer to obtain a finished antibacterial yarn.

[0019] Beneficial effects: The high-elasticity, high-hygroscopicity and antibacterial yarn of the present invention utilizes the fiber properties of modified soybean protein fiber and water-soluble vinylon staple fiber to twist into an inner core, and then undergoes devitrification treatment to obtain a regenerated soybean protein fiber core wire with a porosity of 20-30%. The core wire is combined with a composite fiber to spirally wrap to form a core layer to obtain a core wire with a space gap. The core wire has excellent elasticity, hygroscopicity and antibacterial properties, and is combined with skin-friendly fibers to improve the surface touch, so that the yarn has excellent feel and appearance while having antibacterial, high elasticity and high breathability to meet market demand. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the yarn cross section of a preferred embodiment of the present invention.

[0021] Among them: 1. Inner core; 2. Composite fiber; 3. Core covering layer; 4. Skin-friendly fiber yarn; 5. Surface layer. DETAILED DESCRIPTION

[0022] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0023] In the following embodiments, those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein.

[0024] In this embodiment, the yarn structure is as follows Figure 1 As shown, it includes an inner core 1, a core layer 3 and a surface layer 5, wherein the core wire 1 is made by twisting regenerated soybean protein fiber and water-soluble vinylon staple fiber, and the regenerated soybean protein fiber is prepared by the following method:

[0025] The finished soybean protein fiber is bleached with a bleaching agent, and the bleached soybean protein fiber is added to warm water at 55°C and soaked at a constant temperature for 90 minutes. The bleached soybean protein fiber is then taken out and immediately placed in ice water for rapid cooling. The ice water treatment time is 20 minutes. After being taken out and dried, regenerated soybean protein fiber is obtained. The regenerated soybean protein fiber has smaller intra-fiber gaps.

[0026] The core wire 1 includes 75wt% of regenerated soybean protein fiber and the rest of the water-soluble vinylon staple fiber with a dissolving water temperature of 75°C. The regenerated soybean protein fiber and the water-soluble vinylon staple fiber are twisted in proportion to form a core wire monofilament. The core wire monofilament is added to a hot water bath at 85°C for hot water devitrification treatment. The devitrification bath ratio is controlled to be 1:20, and the devitrification time is controlled to be 42min. After the devitrification treatment is completed, the core wire is added to a 15wt% nitrate glycine chelated silver soaking solution and soaked for 8h, and then put into a nano-titanium dioxide sol for ultrasonic separation. The dispersion was carried out for 25 minutes. After the dispersion was completed, the excess sol was filtered out, and the core 1 was obtained by washing with running water for 20 seconds and then drying with hot air. After the water-soluble vinylon staple fibers were removed, larger inter-fiber gaps were formed, which formed a large and small uniform space gap combination with the inter-fiber gaps in the regenerated soybean protein fibers. The silver ions in the nitrate glycine chelated silver immersion solution were filled in the corresponding space gap positions together with the nano-titanium dioxide sol during the soaking and dispersion process, and the single fiber fineness of the inner core 1 after stable formation was 2.0-2.3dtex.

[0027] The composite fiber 2 is made of 10wt% spandex fiber, 55wt% polyester fiber and 35wt% high hygroscopic fiber by spiral twisting, and during the twisting process, it passes through an elliptical cross-section mold with a major axis to minor axis ratio of 3:2 to obtain a composite fiber 2 with an elliptical cross-section.

[0028] Straighten the inner core 1 after the above steps. Figure 1The design shown here consists of a composite fiber bundle 2 twisted helically onto the inner core to create a core yarn with a single fiber fineness of 4.5 to 5.0 dtex. A skin-friendly fiber yarn 4 is then twisted clockwise helically onto the core sheath 3 to form a surface layer 5, creating the finished yarn.

[0029] Among them, the surface layer 5 shows the touch and surface properties of the yarn to the outside, so skin-friendly fiber yarn with better touch should be used. In this embodiment, the skin-friendly fiber yarn is made by twisting 78% cotton fiber, 15% polyester fiber and 7% Lycra.

[0030] In another embodiment, in order to obtain better surface hydrophilicity for the surface layer 5, the natural fiber components (such as cotton fiber, linen fiber, bamboo fiber, wool fiber) in the mixed fiber yarn 4 can also be pre-soaked in a solution of sodium bromide and polyvinyl alcohol before twisting to obtain better surface hydrophilicity.

[0031] In the present invention, the regenerated soybean protein fiber is prepared from soybean protein as raw material and is obtained by wet spinning. The soybean protein fiber has good physical and chemical properties, low single fiber fineness, and higher strength than natural fibers such as wool, cotton, and silk, and has good spinnability. At the same time, the soybean protein fiber, as a plant protein fiber, has the characteristics of soybean protein and contains a variety of amino acids necessary for the human body. It has certain health care functions when worn for a long time. At the same time, the soybean protein fiber can be soaked at a constant temperature of 50 to 60°C to make its surface swell. At this time, rapid cooling can destroy the internal structure of the plant protein, resulting in changes in the internal organizational structure of the fiber, inducing the mutual fusion of oil bodies, and destroying some of its protein bodies, so that gaps and channels are formed in the internal system of the bleached soybean protein fiber.

[0032] When bleached soy protein fiber is obtained, it is twisted with water-soluble vinylon staple fiber in proportion to form a core yarn, and after the water-soluble vinylon staple fiber in the core yarn is removed, a first type of smaller voids and channels existing inside the bleached soy protein fiber and a second type of larger voids existing between the inner core 1 fibers originally belonging to the water-soluble vinylon staple fiber will be formed in the core yarn. The yarn with the above two types of voids and channels is modified, and the chelated silver can be retained and fixed through these voids and channels, and the fiber surface is stabilized by titanium dioxide sol to prevent the precipitation of chelated silver, thereby consolidating the antibacterial properties of the chelated silver ions.

[0033] However, the toughness of the bleached soy protein fiber after rapid cooling is reduced, making it brittle and losing its elasticity, thus affecting the physical properties of the inner core 1. The spandex and polyester fibers in the composite fiber 2 wrapped around the outer core 1 have excellent elastic recovery and water permeability, while the highly hygroscopic fiber is water-absorbent. The twisted fibers of the three, wrapped around the outer core as a core wrapping layer, provide good dimensional stability for the core, while also providing high elasticity and high hygroscopicity for the yarn. The skin-friendly fibers formed in the outer layer are mainly used to compensate for the yarn's hand feel, making it closer to the feel of skin-friendly fibers.

[0034] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-elasticity, high-hygroscopicity and antibacterial yarn, characterized in that: Including core wire and surface layer; The core yarn has a single fiber fineness of 3.5 to 5.0 dtex and includes an inner core and a core covering layer, and the gap between the inner core and the core covering layer is filled with a nano-antibacterial material. The inner core is a regenerated soybean protein fiber with a porosity of 20 to 30%, and the single fiber fineness of the inner core is 1.5 to 2.5 dtex. The core covering layer is formed on the surface of the inner core and is tightly spirally covered on the entire surface of the inner core by a composite fiber. The composite fiber is spirally twisted by 7 to 11% spandex fiber, 50 to 60% polyester fiber, and the remainder high moisture absorption fiber. The composite fiber has an elliptical cross-section, and the ratio of the major axis to the minor axis of the elliptical cross-section is 3:2 to 2:1, and the elliptical cross-section is tangent to the inner core in the long side direction. The surface layer is formed by twisting skin-friendly fibers and is spirally wrapped on the surface of the core wire in a direction opposite to that of the composite fibers; Specifically, it is prepared by the following steps: 1) Bleaching the soy protein fiber, soaking the bleached soy protein fiber in warm water at 50-60° C. for 1-2 hours, then taking it out and placing it in ice water for rapid cooling to obtain regenerated soy protein fiber; 2) 70-80% regenerated soybean protein fiber and the remaining water-soluble vinylon staple fiber are twisted in proportion to form an inner core monofilament, and the twisted inner core monofilament is added to hot water for water bath devitrification treatment. During the devitrification, the hot water temperature is controlled to be 8-15°C higher than the dissolution temperature of the water-soluble vinylon staple fiber, the devitrification bath ratio is controlled to be 1:15-1:20, and the devitrification time is controlled to be 30-45 minutes; after the devitrification is completed, the inner core is obtained; 3) Spandex fiber, polyester fiber, and high moisture absorption fiber meeting the mass ratio conditions are twisted in proportion to form a composite fiber, and during the twisting process, the composite fiber bundle is passed through an elliptical cross-section die to obtain an elliptical cross-section composite fiber bundle, and the composite fiber bundle is twisted helically on the surface of the inner core to obtain a core yarn; 4) dipping the core wire obtained in step 3) in a nano-antibacterial material dipping solution, then washing the surface slurry with running water and drying with hot air to obtain the treated core wire; 5) A layer of skin-friendly fiber is twisted in a Z-twist direction on the outer surface of the core layer prepared in step 4) as a surface layer, thereby obtaining a finished antibacterial yarn.

2. The high-elasticity, high-hygroscopicity and antibacterial yarn according to claim 1, characterized in that: The nano antibacterial materials are silver ions and nano titanium dioxide.

3. The high-elasticity, high-hygroscopicity and antibacterial yarn according to claim 1, characterized in that: The skin-friendly fiber is one of cotton fiber, linen fiber, bamboo fiber, wool fiber, or a mixture of cotton fiber, linen fiber, bamboo fiber, wool fiber and modal, polyester fiber, spandex, or lycra in any proportion.

4. The high-elasticity, high-hygroscopicity and antibacterial yarn according to claim 1, characterized in that: The skin-friendly fibers are pre-soaked in a solution of sodium bromide and polyvinyl alcohol before being twisted on the core covering layer to obtain better surface hydrophilicity.

Images