Heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles

Abstract

The present invention provides a heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles that reduces the amount of composite tungsten oxide particles used, suppresses the bluish tint of the fiber structure, obtains a sufficient heat-generating effect, and suppresses the shedding of composite tungsten oxide particles from the fiber structure during washing. [Solution] Polycations and composite tungsten oxide particles are attached to a fibrous structure. Two methods can be employed: attaching polycations to the fibrous structure first, and then attaching the composite tungsten oxide particles; or attaching polycations and composite tungsten oxide particles to the fibrous structure simultaneously. The content of composite tungsten oxide particles per unit area in the heat-retaining fibrous structure is preferably 0.01 g / m² or more and less than 0.05 g / m².

Description

Technical Field

[0001] The present invention relates to a heat storage and heat preservation fiber structure using composite tungsten oxide particles.

Background Art

[0002] As heat-generating fiber products, there are known a moisture-absorbing and heat-generating fiber structure in which heat is generated when the fiber adsorbs moisture, and a heat storage and heat preservation fiber structure in which the fiber absorbs sunlight and converts it into heat.

[0003] As a heat storage and heat preservation fiber structure, a fiber structure to which an infrared absorber is added is known. By adding an infrared absorber to the fiber structure, infrared rays can be absorbed from sunlight or the like, and the temperature inside the fiber can be raised.

[0004] As the infrared absorber used in the heat storage and heat preservation fiber structure, composite tungsten oxide particles typified by Cs0.33WO3 as described in Patent Document 1 are used.

[0005] Such composite tungsten oxide particles exhibit a blue color. When an amount sufficient to obtain a sufficient effect is added to a white fiber structure, the blue color of the fiber structure becomes strong, and there is a problem that the color is limited.

[0006] In addition, the composite tungsten oxide particles are a water dispersant and have high water solubility. On the other hand, there is also a problem that the agent easily falls off by washing. [[ID=三十]]

[0007] Furthermore, the blue color of the fiber structure due to the composite tungsten oxide particles can be made substantially white by using a yellow dye in combination. However, there is a problem that the fiber structure becomes yellowish due to the脱落 of the composite tungsten oxide particles by washing.

[0008] <# Patent Document 2 describes a tungsten-based infrared-absorbing pigment dispersion comprising a tungsten-based infrared-absorbing pigment, a vinyl chloride resin emulsion, and water, as well as a textile product treated with a treatment solution containing the tungsten-based infrared-absorbing pigment dispersion, and a method for treating a textile product comprising a cationization treatment step of treating the textile product with a treatment solution containing a cationizing agent, and an adhesion treatment step of treating the textile product with a treatment solution containing the tungsten-based infrared-absorbing pigment dispersion to adhere the tungsten-based infrared-absorbing pigment to the textile product.

[0009] According to the invention of Patent Document 2, a dispersion liquid in which aggregation of tungsten-based infrared-absorbing pigments is suppressed can be obtained, and processing irregularities are suppressed, resulting in a textile product with heat storage and heat retention functions in which the tungsten-based infrared-absorbing pigments are uniformly attached. Furthermore, even when a structure that has already been given a shape is used as the object to be processed, it is possible to impart heat storage and heat retention functions.

[0010] However, the invention described in Patent Document 2 has the problem that, because it uses vinyl chloride, which is susceptible to ultraviolet light, in a tungsten-based infrared-absorbing pigment dispersion, it becomes easily embrittlement due to ultraviolet light during use.

[0011] Patent Document 3 describes a deodorizing fiber structure characterized by having polycations attached to a fiber structure.

[0012] According to the invention of Patent Document 3, it is possible to provide a fiber structure and a processing method thereof that have excellent washing durability and high deodorizing performance against nonenal.

[0013] Furthermore, Patent Document 3 does not mention a heat-retaining and heat-insulating fiber structure to which a composite tungsten oxide is applied. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] Japanese Patent Publication No. 2006-132042 [Patent Document 2] Japanese Patent Publication No. 2022-101126 [Patent Document 3] Japanese Patent Publication No. 2004-100060 [Overview of the project] [Problems that the invention aims to solve]

[0015] The objective is to provide a heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles that reduces the amount of composite tungsten oxide particles used, suppresses the bluish tint of the fiber structure, obtains a sufficient heat-generating effect, and suppresses the shedding of composite tungsten oxide particles from the fiber structure during washing. [Means for solving the problem]

[0016] As a result of diligent research, the inventors have discovered that in a heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles, by attaching polycations and composite tungsten oxide particles to the fiber structure, the amount of composite tungsten oxide particles used can be reduced, and while suppressing the bluish tint of the fiber structure, a sufficient heat-generating effect can be obtained, and the shedding of composite tungsten oxide particles from the fiber structure during washing can be suppressed, thus completing the present invention.

[0017] This invention relates to a heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles, and is based on the following technologies.

[0018] (1) A heat-retaining and heat-insulating fiber structure having polycations and composite tungsten oxide particles attached to a fiber structure.

[0019] (2) A heat-retaining and heat-insulating fiber structure of (1), wherein polycations are attached to the fiber structure, and then composite tungsten oxide particles are attached to it.

[0020] (3) The heat storage and heat preservation fiber structure of (1), which is obtained by simultaneously attaching a polycation and composite tungsten oxide particles to a fiber structure.

[0021] (4) The heat storage and heat preservation fiber structure of (1) to (3), wherein the content per area of the composite tungsten oxide particles with respect to the heat storage and heat preservation fiber structure is 0.01 g / m2 or more and less than 0.05 g / m2.

[0022] (5) The heat storage and heat preservation fiber structure of (1) to (4), wherein the adhesion amount of the polycation with respect to the heat storage and heat preservation fiber structure is 0.3 to 5.0% by weight.

[0023] (6) The heat storage and heat preservation fiber structure of (1) to (5), wherein after attaching a polycation and composite tungsten oxide particles to the fiber structure, a morphological stability treatment is performed.

[0024] Hereinafter, the present invention will be described in more detail. Examples of the form of the fiber structure used in the present invention include woven fabrics, knitted fabrics, non-woven fabrics, etc. As these fiber materials, natural fibers such as cotton, hemp, and wool, regenerated fibers such as rayon, polynosic, cupra, and high-strength regenerated cellulose fibers (for example, trade name Tencel), semi-synthetic fibers such as acetate, synthetic fibers such as polyester and nylon, and blends and interwoven fibers obtained by combining two or more of these fibers are used. [[ID=二十]]

[0025] <Poly-cation> Examples of polycations used in the present invention include allylamine polymers and diallylamine polymers, such as dimethylamine epichlorohydrin polymers, dimethyldiallylammonium chloride polymers, monoallylamine hydrochloride polymers, diallylamine hydrochloride polymers, dimethyldiallylammonium chloride polymers, dialkylaminoethyl (meth)acrylate quaternary polymers, diallylamine salt-sulfur dioxide copolymers, dimethyldiallylammonium chloride-sulfur dioxide copolymers, monoallylamine hydrochloride-dimethyldiallylammonium chloride copolymers, allylamine hydrochloride-diallylamine hydrochloride copolymers, diallylamine hydrochloride-sulfur dioxide copolymers, and allylamine hydrochloride-diallylamine hydrochloride copolymers.

[0026] The weight-average molecular weight of the above polycation is preferably about 1,000 to 70,000, and it can be used as an aqueous solution with a concentration of 10 to 60% by weight, or in solid form.

[0027] The amount of polycation used is such that the amount attached to the fibrous structure is 0.3 to 5% by weight, more preferably 0.5 to 3% by weight.

[0028] <Polycation deposition process> Methods for applying a polycation-containing treatment solution to a fiber structure include the pad / dry method using a tenter, the immersion method using a liquid flow dyeing machine, the drum dyeing machine, etc. However, in the present invention, the pad / dry method is preferred in terms of workability and cost.

[0029] In this case, it is preferable to treat the fibrous structure with liquid ammonia and then apply a treatment solution containing polycations.

[0030] <Composite tungsten oxide particles> As for composite tungsten oxide particles, the general formula is M Y WO Z(However, it is preferable to use composite tungsten oxide particles that are represented as follows: (wherein element M is one or more elements selected from H, He, alkali metals, alkaline earth metals, rare earth elements, Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, W is tungsten, O is oxygen, 0.001≦Y≦1.0, 2.2≦Z≦3.0) and have a hexagonal crystal structure, and it is more preferable to use composite tungsten oxide particles in which element M is one or more elements selected from Cs, Rb, K, Tl, In, Ba, Li, Ca, Sr, Fe, Sn.

[0031] As the composite tungsten oxide particles, cesium tungsten oxide particles (CWO®) manufactured by Sumitomo Metal Mining Co., Ltd. can be suitably used.

[0032] <Process for attaching composite tungsten oxide particles> Methods for attaching composite tungsten oxide particles to fiber structures include using a composite tungsten oxide particle dispersion obtained by dispersing the composite tungsten oxide particles in water at a concentration of 0.04 to 0.1% by weight, more preferably 0.06 to 0.08% by weight, and employing a pad / dry method using a tenter, a liquid flow dyeing machine, a drum dyeing machine, etc. In particular, in the present invention, the pad / dry method is preferred in terms of workability and cost.

[0033] In this invention, the polycation deposition process and the composite tungsten oxide particle deposition process can be carried out simultaneously. In this case, any amount described above can be dispersed in water at the same time, and the process can then be completed using the pad / dry method in the same manner.

[0034] The content of composite tungsten oxide particles per unit area in the heat-retaining and insulating fiber structure is preferably 0.01 g / m2 or more and less than 0.05 g / m2.

[0035] By setting the content of composite tungsten oxide particles per unit area in the heat-retaining fiber structure within the above range, a sufficient heat-generating effect can be obtained while suppressing the bluish tint of the fiber structure.

[0036] The amount of composite tungsten oxide particles per unit area in a heat-retaining and heat-insulating fiber structure is calculated from the difference in weight between the fiber structure before and after the composite tungsten oxide particle attachment process, and the area of ​​the attachment surface.

[0037] <Shape stable processing> In the heat-retaining and heat-insulating fiber structure of the present invention, when using cellulose fibers, it is preferable to crosslink the cellulose fibers using a crosslinking agent to impart excellent wrinkle resistance and W&W properties. If necessary, known processing treatments such as singeing, scouring, bleaching, and mercerizing may be performed before the crosslinking treatment.

[0038] The above-mentioned crosslinking agent refers to a compound that reacts with the hydroxyl groups of cellulose to form crosslinks between cellulosic fibers. Any compound that reacts with the hydroxyl groups of cellulose to create crosslinks between cellulosic fibers can be used.

[0039] Examples of the above-mentioned compounds include those containing a nitrogen atom, a carboxyl group, an epoxy group, an organooxy group, and a hydroxyl group. Specifically, these include urea-formaldehyde compounds (e.g., urea-formaldehyde resins, urea derivatives), melamine-formaldehyde compounds (e.g., melamine-formaldehyde resins, melamine derivatives), cyclic urea compounds (e.g., cyclic urea-type resins, ethylene urea derivatives, butylene urea derivatives), alkyl-carbamate compounds (e.g., alkyl-carbamate resins), acetal compounds (e.g., acetal resins), epoxy compounds (e.g., epoxy resins), silicone compounds containing organooxy or hydroxyl groups (e.g., silicone resins, silicone sols), carboxylic acid compounds, polycarboxylic acids, sulfone compounds, quaternary ammonium salts, 1,3-dichloro-2-propanol derivatives, N-methylolacrylamide, and other compounds. These can be used individually or in combination of two or more. Among these, urea derivatives, melamine derivatives, cyclic urea compounds, epoxy compounds, organooxy or hydroxyl group-containing silicone compounds, and polycarboxylic acids are preferred in terms of effectiveness, physical properties, reactivity, and economy. Furthermore, among these, ethylene urea-type cyclic urea compounds are more preferred.

[0040] The heat-retaining and heat-insulating fiber structure of the present invention can be applied to clothing such as dress shirts, casual shirts, blouses, suits, jackets, slacks, skirts, pajamas, and uniforms. [Examples]

[0041] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[0042] <Preparation of textile structures (textiles)> A 2 / 2 twill weave fabric was produced using British-style cotton count 50 count (50 count single yarn, 100% cotton) as the warp threads and PTT fiber 83dtex (manufactured by Teijin Frontier Co., Ltd., product name "SOLOTEX" (registered trademark)) as the weft threads, with a weave density of 110 warp threads / 2.54cm and 100 weft threads / 2.54cm.

[0043] The resulting fabric was subjected to the same treatment as that applied to fabric A to obtain a finished fabric for dress shirts. The finished width of the twill weave fabric was 108 cm, the basis weight was 127 g / m2, and the cellulose fiber content was 59%.

[0044] The resulting fabric was then treated in the following order: desizing, scouring (desizing by washing with hot water at 90°C for 1 minute, then immersing in a 1.5% by mass sodium persulfate and 2% by mass sodium hydroxide aqueous solution, wringing with a mangle, and then left in a chamber under saturated steam conditions at 90°C for 30 minutes), bleaching (immersing in a 1.2% by mass sodium chlorite solution, wringing with a mangle, and then left in a chamber under saturated steam conditions at 90°C for 30 minutes), and rinsing with water (treating with 60°C water for 1 minute to remove residual chemicals), followed by drying.

[0045] Next, as a mercerizing process, the fabric was immersed in a 20% by mass sodium hydroxide aqueous solution at 20°C for 10 seconds, squeezed with a mangle, then washed with hot water, neutralized with acid, rinsed with water, and dried. Furthermore, the fabric was immersed in liquid ammonia for about 2 seconds, then rinsed with water and dried. Subsequently, the fabric was immersed in liquid ammonia for about 2 seconds, rinsed with water and dried to obtain a fabric for evaluation.

[0046] <Example 1> A 0.75% aqueous solution of Danfix 505RE (manufactured by Nitto Boseki Medical) was obtained as a polycationic agent. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the cationic aqueous solution immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute and dried. Next, tungsten cesium oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water as composite tungsten oxide particles to a concentration of 0.06%. A fabric coated with a polycation agent was impregnated with the aqueous solution of composite tungsten oxide particles by immersing it in a padder, then squeezed with a mangle, and finally treated in a pin tenter set at 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Example 1.

[0047] <Example 2> As composite tungsten oxide particles, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water to an oxide particle concentration of 0.06%. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the aqueous solution of composite tungsten oxide particles immersed in a padder, then squeezed with a mangle, and finally treated in a pin tenter set to 100°C for 1 minute and dried. Next, a 0.75% aqueous solution of Danfix 505RE (manufactured by Nitto Boseki Medical) was obtained as a polycationic agent. A fabric with composite tungsten oxide particles attached was impregnated with the cationic aqueous solution by immersing it in a padder, then squeezed with a mangle, and finally treated in a pin tenter set at 100°C for 1 minute and dried to obtain the heat-retaining and heat-insulating fiber structure of Example 2.

[0048] <Example 3> As a polycation agent, 0.75% of Danfix 505RE (manufactured by Nitto Boseki Medical) and composite tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water to obtain a mixed aqueous solution of tungsten oxide particles and polycation agent at a concentration of 0.06%. The evaluation fabric obtained in <Preparation of Fiber Structure (Fabric)> above was impregnated with the mixed aqueous solution of tungsten oxide particles and polycation agent immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Example 3.

[0049] <Example 4> A 0.75% aqueous solution of Fixer C-855K (manufactured by Shichifuku Chemical Co., Ltd.) was obtained as a polycationic agent. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the cationic aqueous solution immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute and dried. Next, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water as composite tungsten oxide particles to a concentration of 0.06%. A fabric coated with a polycationic agent was impregnated with the aqueous solution of composite tungsten oxide particles by immersing it in a padder, then squeezed with a mangle, and finally treated in a pin tenter set at 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Example 4.

[0050] <Example 5> A 0.75% aqueous solution of Fixer C-855K (manufactured by Shichifuku Chemical Co., Ltd.) was obtained as a polycationic agent. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the cationic aqueous solution immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute and dried. Next, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water as composite tungsten oxide particles to a concentration of 0.04%. A fabric coated with a polycation agent was impregnated with the aqueous solution of composite tungsten oxide particles by immersing it in a padder, then squeezed with a mangle, and finally treated in a pin tenter set at 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Example 5.

[0051] <Comparative Example 1> As an acrylic binder, 3% of Finecoat 70K (manufactured by Yamato Chemical Industry Co., Ltd.) and as composite tungsten oxide particles, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water to obtain an aqueous solution of cesium tungsten oxide particles and acrylic binder at a concentration of 0.06%. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the aqueous solution of cesium tungsten oxide particles and acrylic binder immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Comparative Example 1.

[0052] <Comparative Example 2> As a silicon-based binder, 3% of NeoSticker SI-50 (manufactured by Nikka Chemical Co., Ltd.) and as composite tungsten oxide particles, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water to obtain an aqueous solution of cesium tungsten oxide particles and silicon-based binder at a concentration of 0.06%. The evaluation fabric obtained in <Preparation of Fiber Structure (Fabric)> above was impregnated with the aqueous solution of cesium tungsten oxide particles and silicon-based binder, which had been immersed in a padder, and then squeezed with a mangle. After that, it was treated in a pin tenter set to 100°C for 1 minute and dried to obtain the heat-retaining and heat-insulating fiber structure of Comparative Example 2.

[0053] <Comparative Example 3> A 1% aqueous solution of Danfix 505RE (manufactured by Nitto Boseki Medical) was obtained as a polycationic agent. The evaluation fabric obtained in the above <Preparation of Fiber Structure (Fabric)> was impregnated with the cationic aqueous solution immersed in a padder, then squeezed with a mangle, and treated in a pin tenter set to 100°C for 1 minute and dried. Next, cesium tungsten oxide particles (trademark name: CWO, manufactured by Sumitomo Metal Mining Co., Ltd.) were dispersed in water as composite tungsten oxide particles to a concentration of 0.2%. A fabric coated with a polycation agent was impregnated with the aqueous solution of composite tungsten oxide particles by immersing it in a padder, then squeezed with a mangle, and finally treated in a pin tenter set at 100°C for 1 minute to dry, thereby obtaining the heat-retaining and heat-insulating fiber structure of Comparative Example 3.

[0054] The heat storage capacity and hue of the heat-retaining and heat-insulating fiber structures obtained from Examples 1 to 5 and Comparative Examples 1 to 3 were evaluated.

[0055] <Method for evaluating the heat storage properties of heat-storing and heat-retaining fiber structures> The fiber structure is irradiated with near-infrared radiation equivalent to that specified in JIS L 1926, and, similar to the Boken method, the temperature difference between the processed fiber structure and the unprocessed fiber structure, Δ°C, is used for evaluation. Effectiveness is determined if the temperature difference between the processed and unprocessed fiber structure is 1.5°C or more, both before washing (L0) and after 10 repeated washes (L10), as described later.

[0056] <Preparing the evaluation sample> 1) Connect the left and right thermocouples of the test machine used for evaluating heat storage performance to a handheld monitor. 2) Adjust the temperature of the room to be measured to 25°C ± 1.0°C and leave the evaluation sample for at least 30 minutes. 3) Install the Iwasaki Electric Eye infrared light bulb (110V 375W) in the designated location. 4) Adjust the output voltage using a transformer so that the temperature rises by approximately 10-12°C after 10 minutes of irradiation (the monitor displays 34°C-38°C). 5) Once the adjustment is complete, stop the irradiation and allow it to cool down to the initial temperature of 25°C ± 1.0°C.

[0057] <Measurement method> 1) Place the unprocessed fiber structure on the right and the processed fiber structure on the left. 2) Record the monitored temperature. 3) Start the lamp irradiation and record the monitor temperature every 30 seconds for 5 minutes. 4) After 5 minutes, stop the irradiation and allow it to cool down to the initial temperature of 25°C ± 1.0°C. 5) Swap the left and right sides of the unprocessed fiber structure and the processed fiber structure, and measure in the same manner. 6) Calculate the temperature difference with the unprocessed fiber structure and find the average value of the two points with the left and right sides swapped. 7) If the average Δ℃ is 1.5℃ or higher, it is judged to be superior.

[0058] <Washing Instructions> Add approximately 23 liters of hot water (approximately 40°C) to the washing machine, then add the processed fiber structure, approximately 20g of mild alkaline detergent, and the supplemental fabric. At this time, the total amount of processed fiber structure and supplemental fabric should be 750g to 780g. Wash for 5 minutes, rinse for 2 minutes, and spin dry for 1 minute in the washing machine. Repeat this process 10 times, and then dry the processed fiber structure in a drying room (temperature approximately 40°C, humidity approximately 50%). The supplemental fabric may be tumble dried.

[0059] <Hue determination of textile structures> The difference in whiteness between unprocessed and processed fabrics was determined by visual inspection. The evaluation criteria are as follows: ○: A level that can be classified as white goods at an equivalent level. ×: The fibrous structure clearly has a bluish tint and cannot be classified as white.

[0060] Table 1 shows the evaluation results for the heat storage capacity of heat-retaining and heat-insulating fiber structures and the hue determination of fiber structures.

[0061] [Table 1]

[0062] As can be seen from Table 1, the heat-retaining and heat-insulating fiber structure that satisfies the present invention has obtained good evaluation results regarding heat retention and the hue of the fiber structure. [Industrial applicability]

[0063] According to the present invention, in a heat-retaining and heat-insulating fiber structure using composite tungsten oxide particles, it is possible to reduce the amount of composite tungsten oxide particles used, suppress the bluish tint of the fiber structure, obtain a sufficient heat-generating effect, and suppress the shedding of composite tungsten oxide particles from the fiber structure during washing. This provides a heat-retaining and heat-insulating fiber structure that is extremely practical and of high value.

Claims

1. A heat-retaining and heat-insulating fiber structure characterized by having polycations and composite tungsten oxide particles attached to a fiber structure.

2. The heat-retaining and heat-insulating fiber structure according to claim 1, characterized in that a polycation is attached to the fiber structure, and then composite tungsten oxide particles are attached to it.

3. The heat-retaining and heat-insulating fiber structure according to claim 1, characterized in that polycations and composite tungsten oxide particles are simultaneously attached to the fiber structure.

4. A heat-retaining and heat-insulating fiber structure according to any one of claims 1 to 3, characterized in that the content of composite tungsten oxide particles per unit area in the heat-retaining and heat-insulating fiber structure is 0.01 g / m² or more and less than 0.05 g / m².

5. A heat-retaining and heat-insulating fiber structure according to any one of claims 1 to 4, characterized in that the amount of polycation attached to the heat-retaining and heat-insulating fiber structure is 0.3 to 5.0% by weight.

6. A heat-retaining and heat-insulating fiber structure according to any one of claims 1 to 5, characterized in that polycation and composite tungsten oxide particles are attached to the fiber structure, and then a shape-retention process is performed.

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