Vanadated cotton yarn and its manufacturing method

Abstract

To provide a functional cotton yarn which is almost uniformly colored and can be used as a material for cotton fabric having the functions of absorbing light to generate heat and keeping warm, and which has the functions of absorbing light to generate heat and keeping warm. [Solution] A method for producing vanadated colored cotton yarn with the functions of absorbing light to generate heat and retaining heat includes a yarn immersion step and a dyeing step. In the yarn immersion step, cationized cotton yarn whose surface has been cationized is immersed in a liquid containing vanadium-containing ions, causing the vanadium-containing ions to adhere to the surface of the cationized cotton yarn, thereby obtaining vanadated cotton yarn with the functions of absorbing light to generate heat and retaining heat. In the dyeing step, the vanadated cotton yarn is dyed with a dye to obtain vanadated colored cotton yarn with the functions of absorbing light to generate heat and retaining heat.

Description

[Technical Field]

[0001] This application relates to a cotton yarn having a vanadium component attached to its surface and having the functions of absorbing light to generate heat and retaining heat, and a method for producing this cotton yarn. [Background technology]

[0002] A technology is known in which vanadium components and chemical dyes are attached to wool fabric to impart the wool fabric with the ability to absorb light and generate heat and retain heat (Patent Document 1). The functional wool fabric described in Patent Document 1 has excellent heat generation and heat retention properties. However, it has been difficult to attach vanadium components to cotton fabric and uniformly attach dye to the cotton fabric, i.e., to produce cotton fabric that is uniformly colored and has vanadium components attached to it. This is thought to be due to the different surface properties of wool and cotton, making it more difficult for vanadium components and dyes to adhere to cotton fabric compared to wool fabric. If uniformly colored cotton fabric could absorb light and generate heat and retain heat, the options for materials such as clothing would be expanded. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6792108 Summary of the Invention [Problem to be solved by the invention]

[0004] The present application was made in light of these circumstances, and aims to provide functional cotton fibers and functional cotton yarns that are substantially uniformly colored and can be used as materials for cotton fabrics that have the functions of absorbing light to generate heat and retaining heat. To avoid confusion, the present application uses the kanji character "men" (cotton) to represent cotton, and the katakana character "wata" (cotton) to represent clumps of tangled fibers. Therefore, clumps of tangled cotton fibers are sometimes referred to as "cotton-like cotton." [Means for solving the problem]

[0005] The method for producing vanadated cotton fibers of the present application includes a fiber immersion step of immersing cationized cotton fibers, the surfaces of which have been cationized, in a liquid containing vanadium-containing ions to attach vanadium-containing ions to the surfaces of the cationized cotton fibers, thereby obtaining vanadated cotton fibers that have the functions of absorbing light to generate heat and retaining heat.

[0006] A method for producing vanadated cotton yarn in one embodiment of the present application includes a fiber immersion step of immersing cationized cotton fibers, the surfaces of which have been cationized, in a liquid containing vanadium-containing ions to attach vanadium-containing ions to the surfaces of the cationized cotton fibers, thereby obtaining vanadated cotton fibers that have the functions of absorbing light to generate heat and retaining heat, and a vanadation spinning step of spinning the vanadated cotton fibers to obtain vanadated cotton yarn.

[0007] A method for producing vanadated cotton yarn in another embodiment of the present application includes a cationization spinning step of spinning cationized cotton fibers whose surfaces have been cationized to obtain a cationized cotton yarn, and a yarn immersion step of immersing the cationized cotton yarn in a liquid containing vanadium-containing ions to attach the vanadium-containing ions to the surface of the cationized cotton yarn, thereby obtaining a vanadated cotton yarn that has the function of absorbing light to generate heat and the function of retaining heat.

[0008] A method for producing vanadated cotton yarn in yet another embodiment of the present application includes a yarn immersion step of immersing cationized cotton yarn, the surface of which has been cationized by cationization treatment, in a liquid containing vanadium-containing ions, thereby attaching vanadium-containing ions to the surface of the cationized cotton yarn, thereby obtaining vanadated cotton yarn having the function of absorbing light to generate heat and the function of retaining heat.

[0009] The method for producing vanadated colored cotton yarn of the present application includes a dyeing step of dyeing the vanadated cotton yarn obtained by the method for producing vanadated cotton yarn of the present application with a dye to obtain vanadated colored cotton yarn having the function of absorbing light to generate heat and the function of retaining heat.

[0010] The vanadated cotton fiber of the present invention comprises cotton fibers, cations provided on the surface of the cotton fibers, and vanadium-containing ions attached to the cations, and has the function of absorbing light to generate heat and retain heat.

[0011] The vanadated cotton yarn of the present invention comprises a cotton yarn, a cation provided on the surface of the cotton yarn, and a vanadium-containing ion attached to the cation, and has the function of absorbing light to generate heat and retain heat.

[0012] The vanadated colored cotton yarn of the present invention comprises a cotton yarn, a cation provided on the surface of the cotton yarn, and a vanadium-containing ion and a dye attached to the cation, and has the function of absorbing light to generate heat and retain heat. [Effects of the Invention]

[0013] According to the manufacturing method of the vanadated cotton fiber of the present application, vanadated cotton fiber that is almost uniformly colored and can be used as a material for cotton fabric having the functions of absorbing light to generate heat and retaining heat can be obtained. Also, according to the manufacturing method of the vanadated cotton yarn of the present application, vanadated cotton yarn that is almost uniformly colored and can be used as a material for cotton fabric having the functions of absorbing light to generate heat and retaining heat can be obtained. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the manufacturing method of vanadated cotton fiber, the manufacturing method of vanadated cotton yarn, the manufacturing method of vanadated colored cotton yarn, the vanadated cotton fiber, the vanadated cotton yarn, and the vanadated colored cotton yarn of the present application will be described based on embodiments and examples. Duplicate explanations will be omitted as appropriate. Note that, in the present application, "having the function of absorbing light to generate heat and the function of retaining heat" means having both the function of absorbing light to generate heat and the function of absorbing light to retain heat.

[0015] Vanadated colored cotton yarn capable of absorbing light and generating heat refers to vanadated colored cotton yarn whose temperature after 10 minutes of light irradiation is at least 3°C ​​higher than the temperature of cationic cotton yarn after 10 minutes of light irradiation. The temperatures of the vanadated colored cotton yarn after 10 minutes of light irradiation are preferably at least 5°C higher than the temperatures of the cationic cotton yarn after 10 minutes of light irradiation. Similarly, vanadated cotton yarn capable of absorbing light and generating heat refers to vanadated cotton yarn whose temperature after 10 minutes of light irradiation is at least 3°C ​​higher than the temperature of the cationic cotton yarn after 10 minutes of light irradiation. Vanadated cotton fiber capable of absorbing light and generating heat refers to vanadated cotton fiber whose temperature after 10 minutes of light irradiation is at least 3°C ​​higher than the temperature of the cationic cotton fiber after 10 minutes of light irradiation. The temperatures of the vanadated cotton yarn and vanadated cotton fiber after 10 minutes of light irradiation are preferably at least 5°C higher than the temperatures of the cationic cotton yarn and cationic cotton fiber after 10 minutes of light irradiation.

[0016] Vanadated colored cotton yarn having the ability to absorb light and retain heat refers to vanadated colored cotton yarn whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped is at least 1°C higher than the temperature of a cationic cotton yarn whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped. Similarly, vanadated cotton yarn having the ability to absorb light and retain heat refers to vanadated cotton yarn whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped is at least 1°C higher than the temperature of a cationic cotton yarn whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped. Vanadated cotton fiber having the ability to absorb light and retain heat refers to vanadated cotton fiber whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped is at least 1°C higher than the temperature of a cationic cotton fiber whose temperature one minute after light irradiation has stopped after 10 minutes has been stopped.

[0017] The method for producing vanadated cotton fibers according to an embodiment of the present application includes a fiber immersion process. In the fiber immersion process, cationized cotton fibers whose surfaces have been cationized are immersed in a liquid containing vanadium-containing ions, and the vanadium-containing ions are attached to the surfaces of the cationized cotton fibers. The surfaces of the cotton fibers do not have to be entirely cationized, and at least a portion of the surface may be cationized. The same applies to the cationization of the surface of cotton yarn, which will be described later. The cotton fibers are cotton fibers in a fibrous state. Examples of cotton fibers include cotton in a downy state. The cotton fibers may be natural cotton fibers, or may be regenerated fibers made from natural cotton fibers, such as cupra.

[0018] Cationized cotton fibers, in which the surface of cotton fibers is cationized, can be obtained, for example, by mixing a cationizing agent commercially available as a fiber treatment agent with an alkaline aqueous solution, immersing cotton in the mixture, stirring for several tens of minutes while heating to 50 to 90°C, and then rinsing with running water. Examples of cationizing agents include those containing quaternary ammonium salts. This surface cationization treatment of cotton fibers results in cationized cotton fibers in which cations, i.e., cationic functional groups, are attached to the surface of the cotton fibers.

[0019] Examples of vanadium-containing ions include vanadium ions, vanadyl ions, pervanadyl ions, metavanadate ions, and orthovanadate ions. When cationic cotton fibers are immersed in a liquid containing vanadium-containing ions, the vanadium-containing ions are thought to adhere to the cationic cotton fibers by coordinating with the coordinating groups, such as quaternary ammonium groups, present on the surface of the cationic cotton fibers. Furthermore, when the vanadium-containing ions themselves are anionic, the vanadium-containing ions bond with the cations on the surface of the cationic cotton fibers, thereby adhering to the cationic cotton fibers.

[0020] By attaching an appropriate amount of vanadium-containing ions to cationic cotton fibers, vanadated cotton fibers with the functions of absorbing light, generating heat, and retaining heat can be obtained. If the amount of vanadium-containing ions attached to the cationic cotton fibers is too small, these functions cannot be exerted. Therefore, it is preferable that the vanadium-containing ion concentration of the liquid containing vanadium-containing ions is high, for example, 10 mM or more.

[0021] There are no particular limitations on the wavelength of light irradiated onto vanadated cotton fibers and the vanadated cotton yarn and vanadated colored cotton yarn described below, but vanadated cotton fibers, vanadated cotton yarn, and vanadated colored cotton yarn particularly absorb light on the short wavelength side of the near-infrared region and exhibit high heat generation and heat retention properties. Sunlight has a high energy intensity on the short wavelength side even in the near-infrared region. Therefore, vanadated cotton fibers, vanadated cotton yarn, and vanadated colored cotton yarn are advantageous in demonstrating heat generation and heat retention properties using sunlight.

[0022] The method for producing vanadated cotton yarn of the first embodiment of the present application includes a fiber immersion step and a vanadation spinning step. The fiber immersion step is the same as the fiber immersion step in the method for producing vanadated cotton fiber of the embodiment. In the vanadation spinning step, vanadated cotton fiber is spun to obtain vanadated cotton yarn. The vanadated cotton fiber can be spun using a general fiber spinning method. Note that when vanadated cotton fiber having the functions of absorbing light to generate heat and retaining heat is spun, these functions are maintained, and vanadated cotton yarn having the functions of absorbing light to generate heat and retaining heat is obtained.

[0023] The method for producing vanadated cotton yarn of the second embodiment of the present application comprises a cationization spinning step and a yarn soaking step. In the method for producing vanadated cotton yarn of the first embodiment, vanadium-containing ions are attached to cotton fibers, while in the method for producing vanadated cotton yarn of the second embodiment, vanadium-containing ions are attached to cotton yarn. In the cationization spinning step, cationized cotton fibers whose surfaces have been cationized are spun to obtain cationized cotton yarn. The obtained cationized cotton yarn comprises cotton yarn and cations provided on the surface of the cotton yarn. In other words, the cations on the surface of the fiber remain even after the fiber has been spun into yarn.

[0024] In the yarn immersion process, the cationized cotton yarn is immersed in a liquid containing vanadium-containing ions, and the vanadium-containing ions are attached to the surface of the cationized cotton yarn. In the yarn immersion process, similar to the fiber immersion process, when the cationized cotton yarn is immersed in a liquid containing vanadium-containing ions, it is thought that the vanadium-containing ions are attached to the cationized cotton yarn by, for example, coordinating with the coordinating groups present on the surface of the cationized cotton yarn. By attaching an appropriate amount of vanadium-containing ions to the cationized cotton yarn, a vanadated cotton yarn having the function of absorbing light to generate heat and the function of retaining heat can be obtained.

[0025] A method for producing vanadated cotton yarn according to a third embodiment of the present application includes a yarn immersion step. In the yarn immersion step, cationized cotton yarn, the surface of which has been cationized by cationizing the cotton yarn, is immersed in a liquid containing vanadium-containing ions, and vanadium-containing ions are attached to the surface of the cationized cotton yarn, thereby obtaining vanadated cotton yarn having the functions of absorbing light to generate heat and retaining heat. The methods for producing vanadated cotton yarn according to the first and second embodiments use cationized cotton fibers whose surface has been cationized, while the method for producing vanadated cotton yarn according to the third embodiment uses cationized cotton yarn obtained by cationizing the surface of the cotton yarn.

[0026] Cationized cotton yarn, in which the surface of cotton yarn has been subjected to a cationization treatment, can be obtained, for example, by mixing a cationizing agent commercially available as a thread treatment agent with an alkaline aqueous solution, immersing cotton yarn in the mixture, stirring for several tens of minutes while heating to 50°C to 90°C, and then rinsing with running water. Examples of cationizing agents include those containing quaternary ammonium salts. This type of cationization treatment of the cotton yarn surface results in cationized cotton yarn in which cations, i.e., cationic functional groups, have been added to the surface of the cotton yarn.

[0027] The manufacturing method of vanadated colored cotton yarn of the embodiment of the present application includes a dyeing step. In the dyeing step, the vanadated cotton yarn obtained by the manufacturing method of vanadated cotton yarn of the first to third embodiments is dyed with a dye to obtain a vanadated colored cotton yarn having the functions of absorbing light to generate heat and retaining heat. Even when the vanadated cotton yarn having the functions of absorbing light to generate heat and retaining heat is dyed, these functions remain. This is thought to be because even when an appropriate amount of vanadium-containing ions is attached to the cationized cotton yarn, sufficient cations remain, and the dye can attach to these remaining cations.

[0028] There are no particular restrictions on the dye as long as it can dye cotton. Since it easily adheres to cations, it is preferable that the dye be anionic. Furthermore, when the surface of the vanadated cotton yarn has cations containing quaternary ammonium salts, it is preferable that the dye be a direct dye or reactive dye, which easily adheres to quaternary ammonium salts. Furthermore, from the viewpoint of quality stability, it is preferable that the dye be a chemical dye.

[0029] On the other hand, when an attempt was made to attach vanadium-containing ions to cationic cotton yarn after dyeing it with a dye, almost no vanadium-containing ions were attached. The fact that almost no vanadium-containing ions were attached was confirmed by experimental results showing that no heat was generated even when irradiated with light. This is thought to be due to the fact that when cationic cotton yarn is dyed with a dye, the dye attaches to most of the cations, leaving almost no room for the vanadium-containing ions to attach, and that even if vanadium-containing ions attach to the cationic cotton yarn through the dye, the vanadium-containing ions are easily removed by the subsequent water washing treatment.

[0030] The vanadated cotton fiber of the present embodiment has the function of absorbing light to generate heat and retaining heat. The vanadated cotton fiber of the present embodiment comprises cotton fibers, cations provided on the surface of the cotton fibers, and vanadium-containing ions attached to the cations. The vanadated cotton yarn of the present embodiment has the function of absorbing light to generate heat and retaining heat. The vanadated cotton yarn of the present embodiment comprises cotton yarns, cations provided on the surface of the cotton yarns, and vanadium-containing ions attached to the cations. The vanadated colored cotton yarn of the present embodiment has the function of absorbing light to generate heat and retaining heat. The vanadated colored cotton yarn of the present embodiment comprises cotton yarns, cations provided on the surface of the cotton yarns, and vanadium-containing ions and dyes attached to the cations. [Example]

[0031] Example 1: Vanadated cotton fibers ·Vanadized cotton fiber manufacturing Vanadium-containing ions were attached to the surface of cationic cotton fibers (Asahi Kasei Corporation, Bemberg) prepared by cationizing the surface of regenerated cotton fibers in the form of a cotton wool, as follows: Vanadyl sulfate VOSO4 (Kanto Chemical Co., Ltd.) was dissolved in distilled water to prepare a vanadium-containing aqueous solution with a vanadyl ion concentration of 10 mM.

[0032] Using a small rotary pot dyeing tester (Texam Giken Co., Ltd., MINI COLOUR) (hereinafter sometimes simply referred to as the "rotary pot"), the cationized cotton fiber was immersed in this vanadium-containing aqueous solution at a bath ratio of 1:20, and subjected to a rotary treatment at 60°C for 1 hour. Next, using the rotary pot, the treated cationized cotton fiber was immersed in a 2.0 g / L Marcel soap solution at a bath ratio of 1:20, and subjected to rotary soaping at 50°C for 20 minutes. After soaping, the cationized cotton fiber was washed with running water for 5 minutes and dried to obtain a vanadated cotton fiber.

[0033] Light absorption heat generation and heat retention performance test Cationic cotton fiber and vanadated cotton fiber were placed side by side on a polystyrene foam sample stage and irradiated with light from a photographic reflector lamp (PRF-500WB / D, Panasonic Corporation) from a distance of 30 cm for 10 minutes. The temperatures of the cationized cotton fiber and vanadated cotton fiber after 10 minutes of irradiation were measured using an infrared camera (NEC Avio Infrared Technologies Corporation, InfReC Thermo GEAR G100) (same below). The temperatures of the cationized cotton fiber and vanadated cotton fiber were also measured 1 minute after the reflector lamp was turned off.

[0034] The temperature of the cationized cotton fiber after 10 minutes of light irradiation was 44.4°C, and the temperature of the vanadated cotton fiber after 10 minutes of light irradiation was 53.7°C, a difference of 9.3°C. Therefore, this vanadated cotton fiber has the function of absorbing light and generating heat. In addition, the temperature of the cationized cotton fiber after 1 minute of light extinction was 33.5°C, and the temperature of the vanadated cotton fiber after 1 minute of light extinction was 38.3°C, a difference of 4.8°C. Therefore, this vanadated cotton fiber also has the function of absorbing light and retaining heat.

[0035] Example 2: Vanadated cotton yarn ·Vanadized cotton yarn manufacturing Vanadium-containing ions were attached to the surface of cationized cotton yarn (Asahi Kasei Corporation, Bemberg), which was made from recycled cotton fibers and had its surface cationized, in a manner similar to that of Example 1 to obtain vanadium-containing cotton yarn.

[0036] Light absorption heat generation and heat retention performance test In the same manner as in Example 1, various temperatures of the cationized cotton yarn and the vanadated cotton yarn were measured. The temperature of the cationized cotton yarn after 10 minutes of light irradiation was 38.3°C, and the temperature of the vanadated cotton yarn after 10 minutes of light irradiation was 46.9°C, a difference of 8.6°C. Therefore, this vanadated cotton yarn has the function of absorbing light and generating heat. Furthermore, the temperature of the cationized cotton yarn after 1 minute of light extinction was 30.1°C, and the temperature of the vanadated cotton yarn after 1 minute of light extinction was 34.8°C, a difference of 4.7°C. Therefore, this vanadated cotton yarn also has the function of absorbing light and retaining heat.

[0037] Example 3: Vanadated dyed cotton yarn ·Manufacturing vanadium colored cotton yarn The vanadated cotton yarn of Example 2 was dyed using the following three dyes to obtain vanadated colored cotton yarn. Dye A: 0.2% by mass aqueous solution of Kayarus Light Red F5G Dye B: 5.8% by mass aqueous solution of Kayarus Light Red F5G Dye C: 3.0% by mass aqueous solution of Kayarus Light Yellow F8G

[0038] Vanadated cotton yarns were immersed in dyes A, B, and C in a 1:20 bath ratio using a rotary pot, and rotary dyeing was performed at 60°C for 1 hour. Next, the dyed vanadated cotton yarns were immersed in a 2.0 g / L Marcel soap solution in a 1:20 bath ratio using a rotary pot, and rotary soaping was performed at 50°C for 20 minutes. After soaping, the vanadated cotton yarns were washed in running water for 5 minutes and dried to obtain three types of vanadated-colored cotton yarns. These vanadated-colored cotton yarns were nearly uniformly colored. Therefore, even if cotton fabrics were made from the vanadated-colored cotton yarns, the coloring of the cotton fabrics was also nearly uniform. Even if the color uniformity of the vanadated-colored cotton yarns was slightly lower, the resulting cotton fabrics would have a harmonious texture.

[0039] Light absorption heat generation and heat retention performance test The temperatures of the three types of vanadated colored cotton yarns were measured in the same manner as in Example 1. The temperatures of the cationized cotton yarns were measured using the values ​​in Example 2. The temperatures of the vanadated colored cotton yarns dyed with dyes A to C after 10 minutes of light irradiation were 44.8°C, 47.4°C, and 41.5°C, respectively. The temperature of the cationized cotton yarn after 10 minutes of light irradiation was 38.3°C, so the temperature differences between the cationized cotton yarn and the vanadated colored cotton yarn were 6.5°C, 9.1°C, and 3.2°C, respectively. Therefore, these vanadated colored cotton yarns have the ability to absorb light and generate heat.

[0040] Furthermore, the temperatures of the vanadate-colored cotton yarns dyed with dyes A to C one minute after the lights were turned off were 36.0°C, 37.3°C, and 34.1°C, respectively. The temperature of the cationic cotton yarn one minute after the lights were turned off was 30.1°C, so the temperature differences between the cationic cotton yarn and the vanadate-colored cotton yarn were 5.9°C, 7.2°C, and 4.0°C, respectively. Therefore, these vanadate-colored cotton yarns also have the function of absorbing light and retaining heat.

Claims

1. A method for producing vanadated cotton fibers includes a fiber immersion step of immersing cationized cotton fibers, which are cotton-like cotton fibers whose surfaces have been cationized, in a liquid containing vanadium-containing ions, and attaching the vanadium-containing ions to the surfaces of the cationized cotton fibers to obtain vanadated cotton fibers that have the functions of absorbing light to generate heat and retaining heat.

2. 2. The method for producing vanadated cotton yarn according to claim 1, further comprising a vanadation spinning step of spinning the vanadated cotton fiber to obtain vanadated cotton yarn having the functions of absorbing light to generate heat and retaining heat.

3. A method for producing vanadated colored cotton yarn, comprising a dyeing step of dyeing the vanadated cotton yarn obtained by the method for producing vanadated cotton yarn of claim 2 with a dye to obtain vanadated colored cotton yarn having the functions of absorbing light to generate heat and retaining heat.

4. A method for manufacturing a fiber spun from a cotton fiber, the fiber having a cation attached to the surface of the cotton fiber, and a vanadium-containing ion attached to the cation, Vanadated cotton fiber that has the function of absorbing light to generate heat and retain heat.