Thermal insulation fabric

Abstract

A thermal insulation cloth has a base material of cloth and a thermal insulation layer disposed on the surface of the base material. The thermal insulation layer is formed from a thermal insulation layer composition having aerogel particles, a polyurethane resin binder, a carbodiimide compound, and an isocyanate compound. The content of the carbodiimide compound in the thermal insulation layer composition is 1 parts by mass or more and 10 parts by mass or less relative to 100 parts by mass of the polyurethane resin binder, and the content of the isocyanate compound is 3 parts by mass or more and 15 parts by mass or less relative to 100 parts by mass of the polyurethane resin binder.

Description

Technical Field

[0001] This disclosure relates to thermally insulating fabrics using aerogel. Background Technology

[0002] Various thermal insulation materials are developed by utilizing the high thermal insulation properties of aerogels. For example, Patent Document 1 describes a thermal insulation material manufactured by coating a substrate with a coating made by dispersing silica aerogel in an adhesive liquid, followed by drying. Organic adhesives such as polyurethane resins are used as the adhesive.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2020-29528; Patent Document 2: Japanese Patent No. 6641061; Patent document 3: Utility Model Registration No. 3233325. Summary of the Invention

[0004] The problem that the invention aims to solve Insulation materials using silica aerogel are used not only in the automotive, residential, and home appliance industries, but also in the clothing industry, such as in highly insulating garments, as described in Patent Documents 2 and 3. Clothing fabrics require durability to withstand washing and friction during use. However, in the cured form (insulation layer) of a silica aerogel coating, the silica aerogel particles are simply fixed together by an adhesive. While a higher silica aerogel content is preferred for improved insulation, an increased content makes the insulation layer brittle, and the silica aerogel particles are easily detached (dusting) due to washing. Furthermore, the adhesion between the insulation layer and the substrate is insufficient, posing a risk of peeling off due to washing.

[0005] This disclosure was made in view of this actual situation, and the problem is to provide a thermally insulating fabric with excellent thermal insulation and washability.

[0006] means for solving problems (1) In order to solve the above problems, the heat-insulating fabric of the present disclosure is characterized in that it has a substrate having a fabric and a heat-insulating layer disposed on the surface of the substrate, the heat-insulating layer being formed of a heat-insulating layer composition having aerogel particles, a polyurethane resin adhesive, a carbodiimide compound and an isocyanate compound, wherein the content of the carbodiimide compound in the heat-insulating layer composition is more than 1 part by mass and less than 10 parts by mass relative to 100 parts by mass of the polyurethane resin adhesive, and the content of the isocyanate compound is more than 3 parts by mass and less than 15 parts by mass relative to 100 parts by mass of the polyurethane resin adhesive.

[0007] The composition for forming the insulation layer contains a carbodiimide compound and an isocyanate compound in addition to a polyurethane resin binder. The carbodiimide compound functions as a crosslinking agent for the polyurethane resin binder. It reacts with the polyurethane resin to form urea bonds. This increases the number of crosslinking points and makes the three-dimensional network structure denser, thereby improving the strength of the insulation layer. As a result, the holding power of the aerogel particles increases, and it is less prone to powdering even after washing. The isocyanate compound primarily improves the adhesion between the insulation layer and the substrate. It chemically bonds with hydroxyl groups and other structures on the substrate surface, thereby improving the adhesion of the insulation layer relative to the substrate. Therefore, the insulation layer is less likely to peel off even after washing.

[0008] If compounds that do not contribute to improving thermal insulation are present in the insulation layer, they can form heat transfer paths, increasing heat movement based on conduction and thus potentially reducing thermal insulation performance. In this regard, according to the insulation layer composition of this disclosure, the content of the carbodiimide compound is 10 parts by mass or less, and the content of the isocyanate compound is 15 parts by mass or less, relative to 100 parts by mass of the polyurethane resin binder. Thus, by suppressing the content of compounds that do not contribute to improving thermal insulation, the desired thermal insulation performance is ensured in the insulation layer. Therefore, the thermal insulation fabric of this disclosure exhibits desired thermal insulation performance and excellent washability.

[0009] (2) In the above configuration, the fabric may also be composed of polyester fibers. Hydroxyl groups are present in polyester fibers. Even if the number of hydroxyl groups decreases due to dyeing or other processes, they can be easily replenished by performing other surface treatments such as waterproofing. According to this configuration, the hydroxyl groups of the fabric constituting the substrate are chemically bonded to the isocyanate groups of the insulation layer, thereby improving the adhesion of the insulation layer.

[0010] (3) In any of the above configurations, the fabric may also be waterproof. According to this configuration, the fabric constituting the substrate is waterproof, thus improving washability. In addition, when a heat insulation layer is formed by coating the substrate with a heat insulation layer composition, the penetration of the heat insulation layer composition can be suppressed. Furthermore, when hydroxyl groups are imparted to the fabric through a waterproofing process, they chemically bond with the isocyanate groups of the heat insulation layer, thereby improving the adhesion of the heat insulation layer.

[0011] (4) In any of the above configurations, the substrate may have the fabric and a waterproof layer disposed on its surface, with the heat insulation layer disposed on the surface of the waterproof layer. According to this configuration, when a heat insulation layer is formed by coating the substrate with a heat insulation layer composition, the penetration of the heat insulation layer composition is suppressed, and a heat insulation layer can be easily formed with a uniform thickness. Furthermore, when the waterproof layer has hydroxyl groups, it chemically bonds with the isocyanate groups of the heat insulation layer, thereby improving the adhesion of the heat insulation layer.

[0012] (5) In any of the above configurations, the aerogel particles may also be composed of silica aerogel particles. The size of the skeleton of the silica aerogel particles is well balanced with the size of the pores, resulting in excellent thermal insulation. Therefore, this configuration is suitable for improving thermal insulation. In addition, if hydrophobic sites are present on at least one surface of the silica aerogel particles, both on the outer surface and the inner surface (pore-forming surface), water penetration is suppressed, which is suitable for improving washability.

[0013] (6) In any of the above configurations, the composition for the insulation layer may also include a coupling agent. According to this configuration, the aerogel particles are bonded to the polyurethane resin by the coupling agent, making the aerogel particles less prone to detachment and further improving washability.

[0014] (7) In the configuration described in (6) above, the content of the coupling agent in the composition for the insulation layer may be 0.1 parts by mass or more and 3 parts by mass or less relative to 100 parts by mass of the polyurethane resin adhesive. As mentioned above, from the viewpoint of improving thermal insulation, it is preferable to have fewer compounds that do not contribute to improving thermal insulation. In this respect, according to this configuration, the content of the coupling agent is relatively small, being 3 parts by mass or less relative to 100 parts by mass of the polyurethane resin adhesive, and therefore the effect on thermal insulation caused by the coupling agent is small.

[0015] Invention Effects The heat-insulating fabric disclosed herein has excellent heat insulation and washability. Detailed Implementation

[0016] The following describes embodiments of the thermal insulation fabric of this disclosure. Furthermore, the embodiments are not limited to the following methods and can be implemented in various modifications and variations that can be made by those skilled in the art. The numerical ranges using "~" in this specification represent the range of values ​​before and after "~", which are respectively considered as minimum and maximum values. Within the numerical ranges described in stages in this specification, the individually described upper and lower limits can be arbitrarily combined. Additionally, the upper and lower limits of the numerical ranges can be replaced with the values ​​shown in the embodiments.

[0017] <Insulating Fabrics> The thermal insulation fabric disclosed herein comprises a substrate having a fabric base and a thermal insulation layer disposed on the surface of the substrate. The thermal insulation fabric of this disclosure need only have a substrate and a thermal insulation layer; other components are not particularly limited. For example, the thermal insulation fabric of this disclosure may also have a protective layer covering at least a portion of the thermal insulation layer.

[0018] [Substrate] The substrate is a fabric. The fabric can be any of woven, woven, or nonwoven materials. From the viewpoint of improving strength, woven or woven fabrics are preferred. The fabric can be a single sheet or multiple layers. The material of the fabric is not particularly limited; it can be appropriately selected according to the intended use of the insulating fabric disclosed herein. Examples include chemical fibers such as polyester, nylon, acrylic, polyvinyl chloride, and polyurethane, as well as natural fibers such as cotton, linen, and wool. The fiber can be one type or a mixture of multiple types. Fabrics using polyester fibers have advantages such as excellent quick-drying properties, high durability, and resistance to wrinkling. Furthermore, if fibers containing hydroxyl groups, such as polyester, cotton, acrylic, or linen, are used, the adhesion of the insulating layer is improved through the chemical bonding of the hydroxyl groups of the fabric with the isocyanate groups of the insulating layer.

[0019] From the viewpoint of improving washability and inhibiting the penetration of liquid insulation layer compositions during the formation of insulation layers, it is preferable that at least the fabric in contact with the insulation layer is waterproof. The waterproof fabric can be any of the following: fabric made from fibers that are inherently waterproof, fabric made from fibers that have undergone waterproofing treatments, or fabric that has undergone waterproofing treatments. When waterproofing is applied to fibers or fabric, a waterproofing agent can be applied to the object being treated, or the object can be impregnated with the waterproofing agent. When waterproofing is applied to fabric, part or all of the fabric can be impregnated with the waterproofing agent, or a waterproof layer can be formed on the surface of the fabric. In the latter case, an insulation layer can be disposed on the surface of the waterproof layer. The type of waterproofing agent is not particularly limited; it can be appropriately selected from hydrocarbon-based waterproofing agents, polyurethane-based waterproofing agents, silicone-based waterproofing agents, etc. When the waterproofing agent has hydroxyl groups, the adhesion of the insulation layer is improved through chemical bonding with the isocyanate groups of the insulation layer.

[0020] The substrate can be composed solely of fabric (whether or not it is waterproof), or of fabric and a waterproof layer disposed on its surface, or it can be a laminate consisting of other layers such as resin or elastomer stacked on top of fabric. The surface of the substrate to which the insulation layer is disposed is preferably fabric, or a waterproof layer disposed on its surface. The thickness of the substrate can be appropriately determined according to the application. For example, when thinness and lightweight are required, a thickness of 0.1 mm or more and 1 mm or less is preferred.

[0021] [Insulation layer] The insulation layer is formed from a composition comprising aerogel particles, a polyurethane resin binder, a carbodiimide compound, and an isocyanate compound. The thickness of the insulation layer can be appropriately determined according to the application. For example, if improved insulation is desired, a thickness of 0.1 mm or more is preferred, and more preferably 0.3 mm or more. If thinness and flexibility are required, a thickness of 3 mm or less is preferred, and more preferably 1 mm or less.

[0022] In aerogel particles, multiple primary particles are linked together to form a framework, with pores between these frameworks. The manufacturing method of aerogel is not particularly limited; it can be a method involving drying at atmospheric pressure or drying at supercritical pressure. Sometimes, depending on the drying method used in manufacturing aerogel, those dried at atmospheric pressure are called "dry gels," and those dried at supercritical pressure are called "aerogels." However, in this specification, both (regardless of the drying method) are collectively referred to as "aerogels."

[0023] There is no particular limitation on the type of aerogel particles. Examples of primary particles forming the aerogel framework include inorganic particles such as silica, alumina, zirconium oxide, and titanium dioxide. Among these, silica aerogel particles, with silica as the primary particle, are preferred due to their excellent chemical stability. Silica aerogel particles are white and reflect infrared light. Therefore, using silica aerogel particles can impart a heat-insulating effect to the insulation layer. Furthermore, if hydrophobic sites exist on at least the outer surface and the inner surface (pore-forming surface) of the silica aerogel particles, water penetration is suppressed, which improves washability.

[0024] The shape of the aerogel particles can be spherical, irregularly shaped, etc., without particular limitation. When the aerogel particles are spherical or chamfered (with rounded corners), they are easily fixed with adhesives, preventing them from falling off. Furthermore, it is easier to reduce the gaps between particles, thus increasing the filling volume. In addition, "spherical" in this specification refers not only to a perfect sphere but also includes shapes that are nearly spherical. For example, if the aerogel powder is pulverized, chamfered particles can be easily obtained. Considering the ease of application of the composition for the insulation layer and the suppression of aerogel particle detachment, the size of the aerogel particles is preferably small and uniform. For example, the 90% particle size (D) in the volume-based particle size distribution determined by laser diffraction scattering method is preferred. 90 Preferably, the micrometer size is 200 μm or less, and more preferably 150 μm or less.

[0025] As a polyurethane resin adhesive, an adhesive using water (including pure water, tap water, etc.) as a solvent (aqueous adhesive) is preferred. Among aqueous adhesives, there are water-soluble adhesives and emulsion-like adhesives. Based on the fact that the composition does not easily produce stickiness after curing in the insulation layer, emulsion-like adhesives (aqueous emulsion adhesives) are preferred.

[0026] There are no particular limitations on carbodiimide compounds, as long as they contain a carbodiimide group in their molecule. Examples include dicyclohexylcarbodiimide, diisopropylcarbodiimide, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, dicyclohexylmethanecarbodiimide, aqueous dicyclohexylmethanecarbodiimide, and aqueous tetramethylphenyldimethylcarbodiimide. Considering compatibility with waterborne resins (polyurethane resin adhesives), water-soluble or water-dispersible carbodiimide compounds with a terminal hydroxyl group are preferred.

[0027] The content of the carbodiimide compound is 1 part by mass and 10 parts by mass or less relative to 100 parts by mass of the polyurethane resin adhesive. From the viewpoint of increasing the crosslinking density of the adhesive and thus further increasing the holding force of the aerogel particles, the content of carbodiimide is preferably 2 parts by mass or more. On the other hand, from the viewpoint of thermal insulation, it is preferable to have a low content of compounds that do not contribute to improving thermal insulation. Therefore, the content of carbodiimide is preferably 8 parts by mass or less.

[0028] Examples of isocyanate compounds include aromatic diisocyanates, aliphatic diisocyanates, alicyclic diisocyanates, and mixtures thereof. Specifically, examples include 4,4'-dicyclohexylmethane diisocyanate (HMDI), tetramethylphenyl dimethylene diisocyanate (TMXDI), isophorone diisocyanate (IPDI), 2,4,6-triisopropylphenyl diisocyanate (TIDI), 4,4'-diphenylmethane diisocyanate (MDI), and toluene diisocyanate (TDI).

[0029] The content of the isocyanate compound is 3 parts by mass or more and 15 parts by mass or less per 100 parts by mass of the polyurethane resin adhesive. From the viewpoint of further improving the adhesion of the insulation layer to the substrate, the content of the isocyanate compound is preferably 5 parts by mass or more. On the other hand, from the viewpoint of insulation performance, it is preferable to have a low content of compounds that do not contribute to improving insulation performance. Therefore, the content of the isocyanate compound is preferably 10 parts by mass or less.

[0030] In addition to the aforementioned aerogel particles, polyurethane resin binder, carbodiimide compound, and isocyanate compound, the composition for the thermal insulation layer may include other components such as coupling agents, dispersants, and flame retardants, to the extent that it does not impede the effects achieved based on this disclosure. For example, when silica aerogel particles are used as aerogel particles, by incorporating a silane coupling agent, the silica aerogel particles and the polymer backbone of the polyurethane resin are bonded via the silane coupling agent, thereby further increasing the holding power of the aerogel particles. To achieve this effect, the content of the coupling agent is preferably set to 0.1 parts by weight or more relative to 100 parts by weight of the polyurethane resin binder. On the other hand, from the viewpoint of thermal insulation, the content of the coupling agent is preferably 3 parts by weight or less.

[0031] For example, silica aerogel particles have a low specific gravity and easily float on water. Furthermore, if they have hydrophobic sites on their surface or inside, they are less likely to mix with water. Therefore, when preparing compositions for thermal insulation layers using water as a solvent, a dispersant is preferably added to improve the dispersibility of the silica aerogel particles. Examples of dispersants include surfactants and thickeners.

[0032] Surfactants can be categorized into ionic surfactants (cationic surfactants, anionic surfactants, and amphoteric surfactants) and nonionic surfactants. Examples of ionic surfactants include sodium carboxymethyl cellulose (CMC-Na), polycarboxylate amine salts, polycarboxylate ammonium salts, sodium polycarboxylate, and TEMPO oxidized cellulose nanofibers (CNF-Na). Examples of nonionic surfactants include special polycarboxylate amine salts, polyethylene oxide (PEO), and polyvinyl alcohol (PVA). Furthermore, it is preferable to use both nonionic and ionic surfactants in combination.

[0033] When combined with a flame retardant, the insulation layer can be imparted with flame retardancy. Well-known flame retardants such as halogen-based, phosphorus-based, and metal hydroxide-based flame retardants can be used. Considering environmental impact, phosphorus-based flame retardants are preferred. Examples of phosphorus-based flame retardants include ammonium polyphosphate, red phosphorus, and phosphate esters. Among these, because the flame retardant is less likely to leak out even when in contact with moisture during use, phosphorus-based flame retardants coated with water-insoluble or water-resistant resins are preferred; for example, ammonium polyphosphate or resin-coated ammonium polyphosphate are preferred.

[0034] <Manufacturing Method of Thermal Insulation Fabric> The thermal insulation fabric disclosed herein can be manufactured by coating a substrate with the thermal insulation layer composition or by impregnating a substrate with the thermal insulation layer composition and then drying it. The thermal insulation layer composition is prepared by mixing aerogel powder, polyurethane resin binder, carbodiimide compound, isocyanate compound, and other components added as needed. When the polyurethane resin binder is anhydrous, water can be added appropriately. When the aerogel is silica aerogel, considering its dispersibility, it is preferable to add the silica aerogel powder after adding a dispersant to the polyurethane resin binder or a liquid in which the polyurethane resin binder is added to water. The mixing can be a blade agitator, or by actively applying shear force or applying ultrasound. A rotary agitator or a media-type agitator can also be used.

[0035] To apply the heat insulation layer composition to the substrate, brush coating, or other coating machines such as screen printing, rotary screen printing, doctor blade coating, bar coating, die coating, comma coating (registered trademark), roller coating, or sprayers can be used. After coating or impregnation, the coating film can be dried and cured at a temperature of 80~150℃ for about 5~20 minutes.

[0036] [Example] Next, embodiments will be provided to illustrate this disclosure in more detail.

[0037] <Sample Manufacturing> [Examples 1-7] First, the composition for the heat insulation layer shown in Table 1 (parts by mass) described later was prepared as follows. A polyurethane resin emulsion (PERMARIN UA-368, manufactured by Sanyo Chemical Industries, Ltd., 50% by mass solids), a nonionic surfactant (a special polycarboxylic acid amine salt, NOPCOSPERSE 6100, manufactured by SANNOPCO Co., Ltd.), and sodium carboxymethyl cellulose (CMC-Na, CELLOGEN BSH-12, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) were added to water, and the mixture was stirred. Silica aerogel powder (a pulverized product of Aerogel Particles P200, manufactured by Cabot Corporation, 90% particle size (D)) was added to the mixture. 90 The silica aerogel powder was mixed with 150 μm silica aerogel powder, carbodiimide compound, and isocyanate compound, and stirred. For the samples of Examples 6 and 7, a silane coupling agent ("KBP-90" manufactured by Shin-Etsu Chemical Industry Co., Ltd.) was also added when silica aerogel powder was added.

[0038] Next, a 100% polyester fiber fabric (0.12 mm thick) was impregnated with a hydrocarbon-based waterproofing agent (NEOSEED NR-8800 manufactured by Nichika Chemical Co., Ltd.) and then heat-treated to produce a substrate. The substrate became waterproof through the hydrocarbon-based waterproofing agent-based waterproofing process. Then, the prepared heat-insulating layer composition was applied to the surface of the substrate using a scraper to achieve a coating thickness of 0.25 mm. The substrate was then placed in a hot air oven and held at 80°C for 1 hour, followed by further drying at 100°C until no further loss of mass was observed. This produced samples of the heat-insulating fabrics of Examples 1 to 7, in which a cured product (heat-insulating layer) of the heat-insulating layer composition was disposed on the surface of a substrate.

[0039] [Example 8] Except for the point of waterproofing the substrate using a fluorinated waterproofing agent (NKGUARD S-33 manufactured by Nichika Chemical Co., Ltd.), a sample of the thermal insulation fabric of Example 8 was manufactured in the same manner as in Example 1.

[0040] [Example 9] Except for the point of waterproofing the substrate using a silicone-based waterproofing agent ("POLON-T" manufactured by Shin-Etsu Chemical Industry Co., Ltd.), a sample of the thermal insulation fabric of Example 9 was manufactured in the same manner as in Example 1.

[0041] [Example 10] Except for the fact that no waterproofing process was performed and that a substrate made of 100% polyester fiber was used, a sample of the thermal insulation fabric of Example 10 was manufactured in the same manner as in Example 1.

[0042] [Example 11] Except for changing the base fabric to a cotton-polyester blend (cotton fiber to polyester fiber mass ratio of 6:4, thickness 0.15 mm), a sample of the thermal insulation fabric of Example 11 was manufactured in the same manner as in Example 1. The samples of Examples 1 to 11 are included in the concept of thermal insulation fabric of this disclosure.

[0043] [Comparative Example 1] The composition (in parts by mass) of the heat insulation layer compositions of Comparative Examples 1 to 4 is shown in Table 2 below. As shown in Table 2, except for the point that the heat insulation layer is formed from the heat insulation layer composition that does not contain carbodiimide compounds and isocyanate compounds, the heat insulation fabric of Comparative Example 1 was manufactured in the same manner as in Example 1.

[0044] [Comparative Example 2] Except for the point where the insulation layer is formed by the composition of the insulation layer that does not contain carbodiimide compounds, a sample of the insulation fabric of Comparative Example 2 was manufactured in the same manner as in Example 1.

[0045] [Comparative Example 3] Except for the point where the insulation layer is formed by the composition of the insulation layer that does not contain isocyanate compounds, a sample of the insulation fabric of Comparative Example 3 was manufactured in the same manner as in Example 1.

[0046] [Comparative Example 4] Except for the point that the insulating layer is formed by the composition of the insulating layer with the content of isocyanate compound reduced to 1.0 parts by mass, a sample of the insulating fabric of Comparative Example 4 was manufactured in the same manner as in Example 1.

[0047] <Evaluation Methods> [Washability] The manufactured samples were cut into rectangular shapes with a length of 280 mm and a width of 210 mm, and washing tests were conducted based on JIS L1930:2024 "Household Washing Test Methods for Fiber Products". As part of the washing test, a Type C standard washing machine was used, and washing was repeated 10 times according to the washing method "C4M" in Appendix E of the same JIS, "Washing Method Specification for Type C Standard Washing Machine (Pulsator Type)". The drying method was Method A (hanging to dry).

[0048] The washing method “C4M” specified in Appendix E is as follows.

[0049] Water temperature: 40±3℃.

[0050] Water volume displayed during washing and rinsing processes: 40L.

[0051] Washing process: 6 minutes for washing, 3 minutes for dehydration.

[0052] First rinsing process: rinsing time 2 minutes, dehydration time 3 minutes.

[0053] Second rinsing process: rinsing time 2 minutes, dehydration time 3 minutes.

[0054] Then, the mass of the samples before and after the test is measured, and the washability is evaluated by the mass residue rate calculated based on the following formula (I). For the evaluation of washability, if the mass residue rate is above 85%, it is evaluated as qualified; if it is less than 85%, it is evaluated as unqualified.

[0055] Residual mass percentage (%) = (Sample mass after washing / Sample mass before washing) × 100 (I) Thermal insulation (heat preservation) The manufactured samples were cut into squares measuring 300mm in length and 300mm in width. Thermal insulation tests were conducted according to Method 8.27.1 A (Constant Temperature Method) of JIS L1096:2010 "Test Methods for Fabrics and Woven Fabrics". An ASTM-type thermal insulation tester based on ASTM D 1518-85 was used. The temperature inside the tester was set to 20°C and the relative humidity (RH) to 65%. The thermal insulation rate of the sample was calculated using the following formula (II) based on the energy required by the constant temperature heating element in the tester to maintain the temperature. The constant temperature heating element was 250mm × 250mm in size, the temperature was set to 36 ± 0.5°C, and the test time was set to 120 minutes from when the temperature of the constant temperature heating element became constant. The sample was arranged with the substrate side facing upwards (opposite to the constant temperature heating element). A higher thermal insulation rate indicates higher thermal insulation performance. In the evaluation of thermal insulation, if the insulation rate is above 10%, it is considered qualified; if it is less than 10%, it is considered unqualified.

[0056] Insulation rate (%) = (Ho - Hc) / Ho × 100 (II) [Ho: Heat loss originating from the isothermal heating element, Hc: Heat loss when the sample is wrapped around the isothermal heating element] <Evaluation Results> Tables 1 and 2 summarize the composition of the insulation layer composition used in the manufacture of the samples, the composition of the substrate, and the evaluation results of the samples.

[0057] [Table 1]

[0058] [Table 2]

[0059] As shown in Table 1, the samples of Examples 1 to 11 exhibited good washability and thermal insulation. Compared to the sample of Example 1, the samples of Examples 2 and 4 had lower contents of carbodiimide or isocyanate compounds in the insulation layer, resulting in slightly lower washability but improved thermal insulation. In the samples of Examples 6 and 7, good washability was achieved by incorporating a coupling agent. In the samples of Examples 8 to 11, the type of waterproofing agent used for the waterproofing process on the substrate or the presence or absence of the waterproofing process varied, but the washability remained at a satisfactory level. In contrast, as shown in Table 2, the sample of Comparative Example 1 exhibited good thermal insulation, but the insulation layer did not contain carbodiimide or isocyanate compounds, thus the desired washability could not be obtained. Furthermore, the desired washability could not be obtained in the samples of Comparative Example 2 and Comparative Example 3, which did not contain either carbodiimide compounds or isocyanate compounds in the insulation layer, and in the sample of Comparative Example 4, which contained less than 3 parts by mass of isocyanate compounds.

[0060] Industrial applicability The thermally insulating fabric disclosed herein can be applied to various items in the fields of clothing, outdoor activities, and residential use. For example, it is suitable for cold-weather gear such as clothing, hats, shoe insoles, gloves, bedding, tents, floor mats, curtains, and wall materials.

Claims

1. A heat-insulating fabric, characterized in that, The heat-insulating fabric comprises a substrate having a fabric base and a heat-insulating layer disposed on the surface of the substrate. The insulation layer is formed from an insulation layer composition comprising aerogel particles, polyurethane resin binder, carbodiimide compound, and isocyanate compound. The content of the carbodiimide compound in the composition for the heat insulation layer is more than 1 part by weight and less than 10 parts by weight relative to 100 parts by weight of the polyurethane resin adhesive, and the content of the isocyanate compound is more than 3 parts by weight and less than 15 parts by weight relative to 100 parts by weight of the polyurethane resin adhesive.

2. The thermal insulation fabric according to claim 1, characterized in that, The fabric contains polyester fibers.

3. The thermal insulation fabric according to claim 1 or 2, characterized in that, The fabric is waterproof.

4. The thermal insulation fabric according to any one of claims 1 to 3, characterized in that, The substrate has the fabric and a waterproof layer disposed on its surface. The heat insulation layer is disposed on the surface of the waterproof layer.

5. The thermal insulation fabric according to any one of claims 1 to 4, characterized in that, The aerogel particles are silica aerogel particles.

6. The thermal insulation fabric according to any one of claims 1 to 5, characterized in that, The composition for the insulation layer also contains a coupling agent.

7. The thermal insulation fabric according to claim 6, characterized in that, The content of the coupling agent in the composition for the thermal insulation layer is 0.1 parts by weight or more and 3 parts by weight or less relative to 100 parts by weight of the polyurethane resin adhesive.

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