Insulating fabric

Abstract

To provide an insulating fabric with excellent heat insulation and washability. [Solution] The heat-insulating fabric comprises a base material having fabric and a heat-insulating layer disposed on the surface of the base material. The heat-insulating layer is formed from a heat-insulating layer composition having aerogel particles, a urethane resin binder, a carbodiimide compound, and an isocyanate compound, wherein the content of the carbodiimide compound in the heat-insulating layer composition is 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the urethane resin binder, and 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 urethane resin binder.

Description

Technical Field

[0001] This disclosure relates to a heat-insulating fabric using an aerogel.

Background Art

[0002] Utilizing the high heat-insulating property of aerogels, various heat-insulating materials have been developed. For example, Patent Document 1 describes a heat-insulating material produced by applying a paint in which silica aerogel is dispersed in a binder liquid to a substrate and drying it. As the binder, an organic binder such as a urethane resin is used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0004] Heat-insulating materials using silica aerogel are used not only in the automotive, housing, and home appliance fields but also, for example, in clothing having high heat retention properties in the apparel field as described in Patent Documents 2 and 3. Fabrics for clothing are required to have durability that can withstand washing and friction during use. However, in the cured product (heat-insulating layer) of a paint containing silica aerogel, the particulate silica aerogel is merely fixed by the binder. To enhance the heat-insulating property, it is better to have a higher content of silica aerogel. However, when the content increases, the heat-insulating layer becomes brittle, and the silica aerogel particles are likely to drop off (powder off) during washing or the like. Also, the adhesiveness between the heat-insulating layer and the substrate is not sufficient, and there is a risk that the heat-insulating layer may peel off during washing or the like.

[0005] This disclosure is made in view of the above circumstances, and aims to provide an insulating fabric that is excellent in both heat insulation and washability. [Means for solving the problem]

[0006] (1) In order to solve the above problems, the heat insulating fabric of the present disclosure comprises a base material having a fabric and a heat insulating layer disposed on the surface of the base material, wherein the heat insulating layer is formed from a heat insulating layer composition having aerogel particles, a urethane resin binder, a carbodiimide compound, and an isocyanate compound, wherein the content of the carbodiimide compound in the heat insulating layer composition is 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the urethane resin binder, and 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 urethane resin binder.

[0007] The thermal insulation layer composition for forming the thermal insulation layer contains a urethane resin binder, a carbodiimide compound, and an isocyanate compound. The carbodiimide compound functions as a crosslinking agent for the urethane resin binder. The carbodiimide compound reacts with the urethane resin to form urea bonds. This increases the number of crosslinking points and densifies the three-dimensional mesh structure, thereby increasing the strength of the thermal insulation layer. As a result, the retention force of aerogel particles increases, making them less likely to fall off even after washing. The isocyanate compound primarily improves the adhesion between the thermal insulation layer and the substrate. The isocyanate compound chemically bonds with hydroxyl groups on the substrate surface, improving the adhesion of the thermal insulation layer to the substrate. This makes the thermal insulation layer less likely to peel off even after washing.

[0008] If a thermal insulation layer contains compounds that do not contribute to improving thermal insulation, these compounds can form heat transfer pathways, leading to increased heat transfer by conduction and potentially reducing thermal insulation. In this regard, according to the thermal 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 per 100 parts by mass of the urethane resin binder. By thus suppressing the content of compounds that do not contribute to improving thermal insulation, the desired thermal insulation performance is ensured in the thermal insulation layer. Therefore, the thermal insulation fabric of this disclosure has the desired thermal insulation performance and excellent washability.

[0009] (2) In the above configuration, the fabric may be made up of polyester fibers. Polyester fibers have hydroxyl groups. Even if the number of hydroxyl groups decreases due to dyeing or other processes, hydroxyl groups can be easily added by applying another surface treatment such as water-repellent treatment. With this configuration, the adhesion of the heat insulating layer is improved by chemical bonding between the hydroxyl groups of the fabric constituting the base material and the isocyanate groups of the heat insulating layer.

[0010] (3) In any of the above configurations, the fabric may have a water-repellent properties. With this configuration, since the fabric constituting the base material has water-repellent properties, washability is improved. In addition, when forming an insulating layer by applying an insulating layer composition to the base material, the penetration of the insulating layer composition can be suppressed. Furthermore, if hydroxyl groups are imparted to the fabric by water-repellent treatment, these hydroxyl groups chemically bond with the isocyanate groups of the insulating layer, thereby improving the adhesion of the insulating layer.

[0011] (4) In any of the above configurations, the base material may have the cloth and a water-repellent layer disposed on its surface, and the heat insulating layer may be disposed on the surface of the water-repellent layer. With this configuration, when forming a heat insulating layer by applying the heat insulating layer composition to the base material, the penetration of the heat insulating layer composition is suppressed, making it easier to form a heat insulating layer with a uniform thickness. In addition, if the water-repellent layer has hydroxyl groups, the adhesion of the heat insulating layer is improved by chemical bonding between these hydroxyl groups and the isocyanate groups of the heat insulating layer.

[0012] (5) In any of the above configurations, the aerogel particles may be composed of silica aerogel particles. Silica aerogel particles have a good balance between the size of the skeleton and the size of the pores, and exhibit excellent heat insulation properties. Therefore, this configuration is suitable for improving heat insulation properties. In addition, if hydrophobic regions are present on at least the outer surface and the interior (pore-forming surface) of the silica aerogel particles, water penetration is suppressed, which is suitable for improving washability.

[0013] (6) In any of the above configurations, the composition for the heat insulating layer may further include a coupling agent. With this configuration, the aerogel particles and the urethane resin are bonded by the coupling agent, making it less likely for the aerogel particles to fall off and further improving washability.

[0014] (7) In the configuration of (6) above, the content of the coupling agent in the thermal insulation layer composition may be 0.1 parts by mass or more and 3 parts by mass or less per 100 parts by mass of the urethane resin binder. As mentioned above, from the viewpoint of improving thermal insulation, it is desirable to have fewer compounds that do not contribute to it. In this respect, with the present configuration, the content of the coupling agent is relatively small, at 3 parts by mass or less per 100 parts by mass of the urethane resin binder, so the effect of adding the coupling agent on thermal insulation is small. [Effects of the Invention]

[0015] The heat-insulating fabric of this disclosure has excellent heat insulation and washability. [Modes for carrying out the invention]

[0016] Embodiments of the heat-insulating fabric of this disclosure will be described below. However, the embodiments are not limited to those described below, and can be implemented in various modified and improved forms as possible for those skilled in the art. Numerical ranges using "~" in this specification indicate a range that includes the numbers before and after "~" as the minimum and maximum values, respectively. In the numerical ranges described stepwise in this specification, the individually described upper and lower limits can be combined arbitrarily. Furthermore, the upper and lower limits of the numerical ranges can be replaced with the values ​​shown in the examples.

[0017] <Insulating fabric> The thermal insulation fabric of this disclosure comprises a base material having a fabric and a thermal insulation layer disposed on the surface of the base material. The thermal insulation fabric of this disclosure only needs to have a base material and a thermal insulation layer, and is not particularly limited to other components. For example, the thermal insulation fabric of this disclosure may have a protective layer that covers at least a portion of the thermal insulation layer.

[0018] [Base material] The base material is a fabric. The fabric may be woven, knitted, or nonwoven. From the viewpoint of increasing strength, woven or knitted fabrics are preferable. The fabric may be a single layer or multiple layers laminated together. The material of the fabric is not particularly limited and may be appropriately selected depending on the application of the heat-insulating fabric disclosed herein. Examples include chemical fibers such as polyester, nylon, acrylic, polyvinyl chloride, and polyurethane, and natural fibers such as cotton, linen, and wool. The fiber may be a single type or a mixture of multiple types. Among these, fabric made of polyester fiber has advantages such as excellent quick-drying properties, high durability, and wrinkle resistance. Furthermore, using fibers having hydroxyl groups, such as polyester, cotton, acrylic, and linen, improves the adhesion of the heat-insulating layer due to chemical bonding between the hydroxyl groups of the fabric and the isocyanate groups of the heat-insulating layer.

[0019] From the perspective of improving wash resistance and suppressing the penetration of the liquid heat insulation layer composition during the formation of the heat insulation layer, at least the fabric in contact with the heat insulation layer preferably has water repellency. The water-repellent fabric may be one originally made of water-repellent fibers, one made of fibers subjected to water-repellent treatment such as water-repellent finishing, or one subjected to water-repellent treatment on the fabric. When applying water-repellent treatment to fibers or fabrics, a water-repellent agent may be applied to the treatment target or the treatment target may be immersed in the water-repellent agent. When applying water-repellent treatment to a fabric, a part or all of the fabric can be impregnated with a water-repellent agent, or a water-repellent layer can be formed on the surface of the fabric. In the latter case, the heat insulation layer may be disposed on the surface of the water-repellent layer. The type of the water-repellent agent is not particularly limited and may be appropriately selected from hydrocarbon-based water-repellent agents, urethane-based water-repellent agents, silicone-based water-repellent agents, etc. When the water-repellent agent has a hydroxyl group, the adhesion of the heat insulation layer is improved by its chemical bonding with the isocyanate group of the heat insulation layer.

[0020] The base material may be in a form composed only of a fabric (regardless of the presence or absence of water repellency), or a form composed of a fabric and a water-repellent layer disposed on its surface, or a laminate in which another layer made of a resin, an elastomer, etc. is laminated on the fabric. The surface of the base material on which the heat insulation layer is disposed is preferably in a form of a fabric or a water-repellent layer disposed on its surface. The thickness of the base material may be appropriately determined according to the application. For example, when thinness and weight reduction are required, 0.1 mm or more and 1 mm or less are suitable.

[0021] [Heat insulation layer] The heat insulation layer is formed from a heat insulation layer composition having aerogel particles, a urethane resin binder, a carbodiimide compound, and an isocyanate compound. The thickness of the heat insulation layer may be appropriately determined according to the application. For example, when it is desired to enhance heat insulation, it is desirable to make it 0.1 mm or more, and further 0.3 mm or more. When thinness and flexibility are required, it is desirable to make it 3 mm or less, and further 1 mm or less.

[0022] Aerogel particles are formed by a plurality of primary particles connecting to form a framework, with pores between the frameworks. The method for manufacturing aerogels is not particularly limited, and it may be carried out at normal pressure in the drying process or at supercritical conditions. Depending on the difference in the drying method when manufacturing aerogels, those dried at normal pressure may be called "xerogels", and those dried at supercritical conditions may be called "aerogels". However, in this specification, both are referred to as "aerogels" (regardless of the drying method).

[0023] The type of aerogel particles is not particularly limited. Examples of the primary particles forming the framework of aerogels include inorganic particles such as silica, alumina, zirconia, and titania. Among them, silica aerogel particles in which the primary particles are silica are desirable because of their excellent chemical stability. Silica aerogel particles exhibit white color and reflect infrared rays. Therefore, when silica aerogel particles are used, a heat insulation effect can be imparted to the heat insulation layer. Also, if there is at least a hydrophobic site on the outer surface and the inside (pore-forming surface) of the silica aerogel particles, the penetration of water is suppressed, which is suitable for improving wash resistance.

[0024] The shape of the aerogel particles is not particularly limited, such as spherical or amorphous块状. When the aerogel particles are spherical or chamfered (rounded corners), they are easier to be fixed by a binder, less likely to fall off, and it is also easier to reduce the voids between particles and increase the filling amount. Note that the "spherical" in this specification is not limited to a perfect spherical shape, but is a concept including a shape close to spherical (almost spherical). For example, when the powder of aerogel is pulverized, particles with a chamfered shape can be easily obtained. Considering the ease of coating the composition for the heat insulation layer and suppressing the fall-off of aerogel particles, the size of the aerogel particles is preferably relatively small and uniform. For example, the 90% diameter (D

[0025] , ) in the volume-based particle size distribution measured by the laser diffraction / scattering method is preferably 200 μm or less, and more preferably 150 μm or less.

[0025] As the urethane resin binder, it is preferable to use a binder that uses water (including pure water and tap water) as a solvent (aqueous binder). Aqueous binders include water-soluble binders and emulsion-type binders, but emulsion-type binders (aqueous emulsion binders) are preferred because they are less likely to become sticky after the heat insulation layer composition has hardened.

[0026] The carbodiimide compound is not particularly limited as long as it is a compound having a carbodiimide group in its molecule. Examples include dicyclohexylcarbodiimide, diisopropylcarbodiimide, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, dicyclohexylmethanecarbodiimide, aqueous dicyclohexylmethanecarbodiimide, and aqueous tetramethylxylylenecarbodiimide. Considering compatibility with aqueous resins (urethane resin binders), water-soluble or water-dispersible carbodiimide compounds having hydroxyl groups at the terminals are preferred.

[0027] The content of the carbodiimide compound is between 1 and 10 parts by mass per 100 parts by mass of the urethane resin binder. From the viewpoint of increasing the crosslinking density of the binder and thereby increasing the retention force of aerogel particles, it is preferable that the carbodiimide content be 2 parts by mass or more. On the other hand, from the viewpoint of thermal insulation, it is desirable to have a low content of compounds that do not contribute to improving thermal insulation. Therefore, it is preferable that the carbodiimide content be 8 parts by mass or less.

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

[0029] The isocyanate compound content is 3 parts by mass or more and 15 parts by mass or less per 100 parts by mass of the urethane resin binder. From the viewpoint of further improving the adhesion of the heat insulating layer to the substrate, the isocyanate compound content should be 5 parts by mass or more. On the other hand, from the viewpoint of heat insulating properties, it is desirable to have a low content of compounds that do not contribute to improving heat insulating properties. Therefore, the isocyanate compound content should be 10 parts by mass or less.

[0030] In addition to the aerogel particles, urethane resin binder, carbodiimide compound, and isocyanate compound described above, the composition for the heat insulating layer may also contain other components such as coupling agents, dispersants, and flame retardants, to the extent that they do not hinder the effects achieved by this disclosure. For example, when silica aerogel particles are used as the aerogel particles, by incorporating a silane coupling agent, the silica aerogel particles and the polymer backbone of the urethane resin are bonded via the silane coupling agent, thereby increasing the retention force of the aerogel particles. The content of the coupling agent should be 0.1 parts by mass or more per 100 parts by mass of the urethane resin binder in order to exert its effect. On the other hand, from the viewpoint of heat insulating properties, the content of the coupling agent should be 3 parts by mass or less.

[0031] For example, silica aerogel particles have a low specific gravity and tend to float on water. Also, if they have hydrophobic regions on their surface or inside, they do not mix well with water. Therefore, when preparing a composition for an insulating layer using water as a solvent, it is desirable to include a dispersant to improve the dispersibility of the silica aerogel particles. Examples of dispersants include surfactants and thickeners.

[0032] Surfactants include ionic surfactants (cationic surfactants, anionic surfactants, and amphoteric surfactants) and nonionic surfactants. Examples of ionic surfactants include sodium carboxymethylcellulose salt (CMC-Na), polycarboxylate amine salt, ammonium polycarboxylate salt, sodium polycarboxylate salt, and TEMPO-oxidized cellulose nanofiber (CNF-Na). Examples of nonionic surfactants include special polycarboxylate amine salt, polyethylene oxide (PEO), and polyvinyl alcohol (PVA). It is also preferable to use nonionic and ionic surfactants in combination.

[0033] By incorporating a flame retardant, flame retardancy can be imparted to the insulation layer. Any known flame retardants, such as halogen-based, phosphorus-based, or metal hydroxide-based agents, can be used. Considering the environmental impact, the use of phosphorus-based flame retardants is desirable. Examples of phosphorus-based flame retardants include ammonium polyphosphate, red phosphorus, and phosphate esters. Among these, those that are insoluble in water or coated with water-resistant resins are preferable because they are less likely to leach out even when in contact with moisture during use. For example, ammonium polyphosphate and resin-coated ammonium polyphosphate are suitable.

[0034] <Method for manufacturing heat-insulating fabric> The heat-insulating fabric of this disclosure can be manufactured by applying a heat-insulating layer composition to a substrate or by immersing a substrate in a heat-insulating layer composition and then drying it. The heat-insulating layer composition may be prepared by blending aerogel powder, a urethane resin binder, a carbodiimide compound, an isocyanate compound, and additional components as needed, and stirring them together. If the urethane resin binder does not contain water, water may be added as appropriate. If the aerogel is silica aerogel, considering its dispersibility, it is desirable to add a dispersant to the urethane resin binder or a liquid mixture of water and urethane resin binder before adding the silica aerogel powder. Stirring may be done by blade stirring, but shear force may also be actively applied or ultrasonic waves may be applied. A rotating or revolving stirring device or a media-type stirring device may also be used.

[0035] The thermal insulation layer composition can be applied to the substrate by brushing, using coating machines such as screen printing, rotary screens, blade coaters, bar coaters, die coaters, comma coaters (registered trademarks), and roll coaters, or by spraying. After application or immersion, the coating film should be dried and cured by holding it at a temperature of 80 to 150°C for about 5 to 20 minutes. [Examples]

[0036] Next, the present disclosure will be described in more detail with reference to examples.

[0037] <Sample Manufacturing> [Examples 1-7] First, a thermal insulation layer composition (in parts by mass) with the composition shown in Table 1 below was prepared as follows: A urethane resin emulsion (Sanyo Chemical Industries, Ltd.'s "Permarin® UA-368", 50% solids by mass) as a urethane resin binder, a nonionic surfactant (special polycarboxylic acid amine salt, Sanopco Inc.'s "Nopcospers® 6100") as a dispersant, and a carboxymethylcellulose sodium salt (CMC-Na, Daiichi Kogyo Seiyaku Co., Ltd.'s "Selogen® BSH-12") were added to water and stirred. Silica aerogel powder (pulverized product of Cabot Corporation's "Aerogel Particles P200", 90% diameter (D)) was then added. 90 The mixture was stirred with (150 μm), a carbodiimide compound, and an isocyanate compound. For the samples in Examples 6 and 7, a silane coupling agent (KBP-90, manufactured by Shin-Etsu Chemical Co., Ltd.) was also added when the silica aerogel powder was added.

[0038] Next, a woven fabric made of 100% polyester fibers (0.12 mm thick) was impregnated with a hydrocarbon-based water repellent ("Neoseed® NR-8800" manufactured by Nikka Chemical Co., Ltd.), and then heat-treated to produce a base material. The base material becomes water-repellent due to the water-repellent treatment with the hydrocarbon-based water repellent. Then, the prepared heat-insulating layer composition was blade-coated onto the surface of the base material to a thickness of approximately 0.25 mm, and it was placed in a hot air oven and held at 80°C for 1 hour, after which the temperature was raised to 100°C and further dried until there was no further loss of mass. In this way, samples of heat-insulating fabrics of Examples 1 to 7 were produced, in which a cured product of the heat-insulating layer composition (heat-insulating layer) was placed on the surface of the base material.

[0039] [Example 8] A sample of the heat-insulating fabric of Example 8 was manufactured in the same manner as in Example 1, except that the base material was treated with a fluorine-based water-repellent agent ("NK Guard (registered trademark) S-33" manufactured by Nikka Chemical Co., Ltd.).

[0040] [Example 9] A sample of the heat-insulating fabric of Example 9 was manufactured in the same manner as in Example 1, except that the base material was treated with a silicone-based water-repellent agent ("POLON®-T" manufactured by Shin-Etsu Chemical Co., Ltd.).

[0041] [Example 10] A sample of the heat-insulating fabric of Example 10 was manufactured in the same manner as in Example 1, except that the base material was made only from 100% polyester fiber fabric without water-repellent treatment.

[0042] [Example 11] A sample of the heat-insulating fabric of Example 11 was manufactured in the same manner as in Example 1, except that the base fabric was changed to a blended woven fabric of cotton and polyester (mass ratio of cotton fibers to polyester fibers: 6:4, thickness: 0.15 mm). The samples of Examples 1 to 11 are included in the concept of heat-insulating fabric of this disclosure.

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

[0044] [Comparative Example 2] A sample of the heat-insulating fabric of Comparative Example 2 was prepared in the same manner as in Example 1, except that the heat-insulating layer was formed from a heat-insulating layer composition that did not contain a carbodiimide compound.

[0045] [Comparative Example 3] A sample of the heat-insulating fabric of Comparative Example 3 was prepared in the same manner as in Example 1, except that the heat-insulating layer was formed from a heat-insulating layer composition that did not contain an isocyanate compound.

[0046] [Comparative Example 4] A sample of the heat-insulating fabric of Comparative Example 4 was prepared in the same manner as in Example 1, except that the heat-insulating layer was formed from a heat-insulating layer composition in which the content of the isocyanate compound was reduced to 1.0 part by mass.

[0047] <Evaluation Method> [Washability] The manufactured sample was cut into a rectangle measuring 280 mm in length and 210 mm in width, and a washing test was conducted based on JIS L1930:2024 "Household Laundry Test Method for Textile Products". For the washing test, a Type C standard washing machine was used, and the washing method "C4M" from Annex E of the same JIS, "Specifications for Washing Method of Type C Standard Washing Machine (Pulsator Type)", was repeated 10 times. The drying method was Method A (hang drying). The details of the washing method "C4M" specified in Annex E are as follows: Water temperature: 40±3℃. Indicated water volume for washing and rinsing cycles: 40L. Washing process: Washing time 6 minutes, spin-drying time 3 minutes. First rinse cycle: Rinse time 2 minutes, spin-dry time 3 minutes. Second rinsing cycle: Rinse time 2 minutes, spin-dry time 3 minutes. The mass of the samples was measured before and after the test, and the washability was evaluated based on the mass retention rate calculated using the following formula (I). A washability evaluation was based on whether the mass retention rate was 85% or higher, and whether it was below 85%, which was considered a failure. Mass retention rate (%) = Sample mass after washing / Sample mass before washing × 100 ... (I)

[0048] [Thermal insulation (heat retention)] The manufactured samples were cut into 300mm x 300mm squares, and a heat retention test was conducted based on "8.27.1 Method A (constant temperature method)" of JIS L1096:2010 "Testing methods for woven and knitted fabrics". An ASTM-type heat retention tester conforming to ASTM D 1518-85 was used as the heat retention tester. The temperature inside the heat retention tester was set to 20°C and the relative humidity (RH) to 65%. The heat retention rate of the sample was calculated from the amount of energy used by the constant temperature heating element installed in the tester to maintain the temperature using the following formula (II). The size of the constant temperature heating element was 250mm x 250mm, the temperature was 36±0.5°C, and the test time was 120 minutes after the temperature of the constant temperature heating element became constant. The sample was placed with the base material side up (opposite side from the constant temperature heating element). A higher heat retention rate indicates higher heat insulation. For thermal insulation performance, a heat retention rate of 10% or higher was considered a pass, while anything below 10% was considered a fail. Heat retention rate (%)=(Ho-Hc) / Ho×100 (II) [Ho: Heat loss from the constant-temperature heating element, Hc: Heat loss when the constant-temperature heating element is covered with a sample]

[0049] <Evaluation Results> Tables 1 and 2 summarize the composition of the thermal insulation layer composition used in the production of the samples, the composition of the substrate, and the evaluation results of the samples. [Table 1] [Table 2]

[0050] As shown in Table 1, the samples of Examples 1 to 11 showed good washability and heat insulation. Compared to the sample of Example 1, the samples of Examples 2 and 4 showed slightly reduced washability due to the low content of carbodiimide or isocyanate compounds in the heat insulation layer, but improved heat retention (heat insulation). In the samples of Examples 6 and 7, good washability was obtained by incorporating a coupling agent. In the samples of Examples 8 to 11, although the type of water repellent used for the water-repellent treatment of the base material differed or whether or not water repellency treatment was performed, the washability was at an acceptable level. In contrast, as shown in Table 2, the sample of Comparative Example 1 showed good heat insulation, but the desired washability could not be obtained because the heat insulation layer did not contain carbodiimide or isocyanate compounds. Furthermore, the samples of Comparative Examples 2 and 3, which did not contain either carbodiimide or isocyanate compounds in the heat insulation layer, and the sample of Comparative Example 4, which contained less than 3 parts by mass of isocyanate compounds, also did not obtain the desired washability. [Industrial applicability]

[0051] The heat-insulating fabric disclosed herein can be applied to a variety of items in the apparel, outdoor, and housing sectors. For example, it is suitable for clothing, hats, shoe insoles, gloves and other cold-weather gear, bedding, tents, picnic blankets, curtains, and wall materials.

Claims

1. It comprises a base material having a cloth, and a heat insulating 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 urethane resin binder, a carbodiimide compound, and an isocyanate compound. A heat-insulating fabric characterized in that the content of the carbodiimide compound in the heat-insulating layer composition is 1 part by mass or more and 10 parts by mass or less per 100 parts by mass of the urethane resin binder, and 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 urethane resin binder.

2. The aforementioned fabric is a heat-insulating fabric according to claim 1, having polyester fibers.

3. The aforementioned fabric is a water-repellent heat-insulating fabric according to claim 1.

4. The substrate comprises the cloth and a water-repellent layer disposed on its surface. The insulating layer is disposed on the surface of the water-repellent layer, as described in claim 1.

5. The thermal insulation fabric according to claim 1, wherein the aerogel particles are silica aerogel particles.

6. The thermal insulation fabric according to claim 1, further comprising a coupling agent in the thermal insulation layer composition.

7. The heat insulating fabric according to claim 6, wherein the content of the coupling agent in the heat insulating layer composition is 0.1 parts by mass or more and 3 parts by mass or less per 100 parts by mass of the urethane resin binder.

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