Skin material for vehicle

Abstract

To provide a skin material for a vehicle suppressing the temperature rise of a space in a cabin due to solar rays in summer and having good design effect, touch and light fastness.SOLUTION: The vehicle skin material according to the embodiment is a skin material made of a fibrous base material having a yarn containing a heat shielding agent in at least a part thereof. The heat shielding agent contained in the skin material is 10g / m2 or more. The exposure rate of the yarn containing the heat shielding agent on the front surface of the skin material is 25% or less. The infrared reflectivity of the front surface of the skin material at wavelengths of 800 to 1600nm is 80% or more. A root mean square slope (W Δ q) of a waviness profile of a front surface of the skin material is in a range of 0.36 to 0.84.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a vehicle skin material. [Background technology]

[0002] Genuine leather, synthetic leather, knitted fabrics, woven fabrics, nonwoven fabrics, and the like are used as surface materials for vehicle interior materials. Furthermore, single-layer resin sheets made of polyvinyl chloride or thermoplastic polyolefin resin (TPO) are used as surface materials for dashboards. The brightness of the resin sheets is low (approximately 60 or less) to prevent reflections on the windshield. Therefore, when sunlight enters through the window glass of a vehicle, for example, much of the sunlight's near-infrared rays is absorbed by the vehicle interior material and stored as heat energy. This causes the temperature of the vehicle interior material to rise, sometimes to the point where it is difficult to touch. Therefore, various studies have been conducted on surface materials to suppress the temperature rise of vehicle interior materials.

[0003] Patent Document 1 discloses a skin material in which a sheet with angle-selective transmittance is laminated on the surface of a retroreflective layer, and discloses that this provides a skin material that can suppress an increase in the surface temperature of interior materials by reflecting solar radiation, while preventing the reflection of solar radiation from the skin onto windows, thereby adversely affecting passenger visibility. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2005-041120 Summary of the Invention [Problem to be solved by the invention]

[0005] The covering material in Patent Document 1 is a resin sheet, so there is still room for improvement in terms of achieving a balance between infrared reflectance, design, and tactile feel.

[0006] The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a vehicle covering material that suppresses the temperature rise in the vehicle interior space due to sunlight in the summer and that also has good design, tactile feel, and light resistance. [Means for solving the problem]

[0007] The present invention includes the embodiments shown below. [1] A skin material made of a fibrous base material having at least a part of a thread containing a heat-shielding agent, wherein the heat-shielding agent contained in the skin material is 10 g / m 2 or above, wherein an exposed rate of yarns containing a heat-shielding agent on the front surface of the skin material is 25% or less, the front surface of the skin material has an infrared reflectance of 80% or more in the wavelength range of 800 to 1600 nm, and the root-mean-square slope (WΔq) of the waviness curve of the front surface of the skin material is in the range of 0.36 to 0.84. [2] The vehicle skin material according to [1], wherein a resin film containing a heat-shielding agent is applied to the back surface of the fibrous base material. [3] The basis weight of the skin material is 200 g / m 2 The vehicle skin material according to [1] or [2] above. [Effects of the Invention]

[0008] According to an embodiment of the present invention, it is possible to provide a vehicle covering material that suppresses temperature increases in the vehicle interior space due to sunlight in the summer and that further has good design, tactile feel, and light resistance. [Brief explanation of the drawings]

[0009] [Figure 1] 3 is a diagram showing the relationship between incident light and reflected light when the vehicle skin material according to the present embodiment is installed on an instrument panel. FIG. [Figure 2] FIG. 10 is an explanatory diagram illustrating a temperature test method. [Figure 3] 1 is a weave diagram of a satin weave (8-ply satin) of Example 1. [Figure 4] FIG. 1 is a weave diagram of a twill weave (3 / 1 twill) of Example 3. [Figure 5] FIG. 10 is a structure diagram of the double woven fabric of Example 5. [Figure 6] FIG. 1 is a weave diagram of a twill weave (2 / 1 twill) of Comparative Example 4. [Figure 7] FIG. 10 is a structure diagram of the circular knitted fabric of Example 7. [Figure 8] FIG. 10 is a structure diagram of the circular knitted fabric of Example 10. [Figure 9] FIG. 11 is a structure diagram of the tricot knit fabric of Example 18. [Figure 10] FIG. 10 is a structure diagram of the tricot knit fabric of Example 20. [Figure 11] FIG. 2 is a structure diagram of the tricot knit fabric of Example 22. DETAILED DESCRIPTION OF THE INVENTION

[0010] The skin material according to this embodiment is suitable for use in vehicle skins, particularly in areas exposed to direct sunlight such as dashboards and upper door trim panels, and is made of a fibrous base material having, at least in part, a yarn containing a heat-shielding agent. The exposed rate of the yarn containing the heat-shielding agent on the front surface of the skin material is 25% or less. By keeping the exposed rate of the yarn containing the heat-shielding agent on the front surface below the upper limit, it is possible to suppress a decrease in lightfastness due to the yarn containing the heat-shielding agent. Here, the "front surface" of the skin material refers to the surface (design surface) that is visible when in use, out of the front and back surfaces of the skin material.

[0011] The exposed ratio of the yarn containing the heat-shielding agent is calculated by the following formula by determining the exposed ratio of the yarn containing the heat-shielding agent relative to the surface area of ​​the skin material. Exposure rate of yarn containing heat-shielding agent (%) = (SA / SF) × 100 Here, SA is the total area of ​​the yarn containing the heat-shielding agent exposed on the front surface of the skin material, and SF is the surface area of ​​the skin material.

[0012] Specifically, it is calculated as follows: Using a digital microscope (for example, VHX-5000 manufactured by Keyence Corporation), the front surface of the skin material is observed and photographed at a magnification of 100 times. The obtained image is then photographed on a 10 cm x 10 cm (100 cm) screen. 2 ) and measure the total area (SA) of the yarn containing the heat-shielding agent using a digital planimeter (for example, Placom KP-90N, manufactured by Koizumi Sokki Seisakusho Co., Ltd.). The total area (SA) of the yarn containing the heat-shielding agent relative to the surface area (SF) of the skin material is calculated as a percentage. Note that observations are made at any three locations, and the average of the values ​​calculated for the total area (SA) of the yarn containing the heat-shielding agent relative to the surface area (SF) of the skin material, expressed as a percentage, is taken as the exposure rate of the yarn containing the heat-shielding agent. The average value is rounded to one decimal place and expressed as an integer. If the location of the yarn containing the heat-shielding agent is unknown, an elemental analysis of the front surface of the skin material is performed using a tabletop microscope equipped with an X-ray source (e.g., Hitachi High-Tech's Miniscope TM4000Plus), an EDS detector (e.g., Oxford Instruments' Ultim Max), and dedicated elemental analysis software (e.g., Oxford Instruments' AZtecLive) with TruLINE analysis to identify the yarn containing the heat-shielding agent, and then observation and measurement are performed using the above method. In TruLINE analysis, for yarns that do not contain a heat-shielding agent, the Ti intensity is barely detected (at least 0.20 wt % or less). On the other hand, for yarns that contain a heat-shielding agent containing titanium oxide as a heat-shielding agent, a Ti intensity of 0.40 wt % or more is detected. Therefore, in this embodiment, the portion with a Ti intensity of 0.40 wt % or more is identified as the yarn containing the heat-shielding agent.

[0013] The fibrous substrate used in the present embodiment is not particularly limited, and may be, for example, a fibrous fabric such as a woven fabric or a knitted fabric. By using a fibrous fabric, it is possible to improve the design and feel.

[0014] The fibrous base material combines yarns containing a heat-shielding agent with yarns not containing a heat-shielding agent, and arranges the yarns containing the heat-shielding agent so that they are not exposed to more than 25% of the front surface of the fibrous base material (i.e., the front surface of the skin material), which is the part directly exposed to light, heat, etc. When used in vehicle interior materials, it is possible to suppress deterioration in appearance and physical properties over time and to obtain a skin material with sufficient durability. The exposure rate of the yarns containing the heat-shielding agent is preferably 15% or less, more preferably 10% or less, even more preferably 3% or less, and particularly preferably as close to 0% as possible.

[0015] The fiber material constituting the yarn containing the heat-shielding agent is not particularly limited, and any conventionally known fiber material can be used. From the viewpoint of durability, the fiber material is preferably a synthetic fiber, more preferably a polyester fiber.

[0016] The yarn containing the heat-shielding agent may be any of spun yarn (staple fiber yarn), multifilament yarn, and monofilament yarn (all of which are continuous fiber yarn). The multifilament yarn may be twisted as needed, or may be subjected to processing such as false twisting or fluid agitation (Taslan processing, interlacing processing, etc.). Among these, from the viewpoint of suppressing the temperature rise in the vehicle interior due to sunlight, it is preferable to use a bulky yarn. Bulky yarn has fewer voids between the fibers, so it can suppress the transmission of infrared rays. This improves infrared reflectivity, making it easier to suppress the temperature rise in the vehicle interior.

[0017] The heat-shielding agent used in the heat-shielding agent-containing yarn is not particularly limited, and examples thereof include conventionally known titanium oxide, titanium oxide surface-treated with an aluminum compound, zinc oxide, etc. These may be used alone or in combination of two or more.

[0018] The average particle size of the heat-shielding agent is not particularly limited. From the viewpoint of improving infrared reflectivity in the 800 to 1600 nm range, the average particle size is preferably close to the infrared wavelength, specifically 0.5 to 2.0 μm, and more preferably 0.8 to 1.6 μm. If the average particle size of the heat-shielding agent is below the lower limit, the heat-shielding agent is too small relative to the infrared wavelength, increasing the probability that the infrared light passes through without being reflected, which may result in reduced infrared reflectivity. If the average particle size of the heat-shielding agent exceeds the upper limit, in the case of polyester fibers, the disperse dye is prevented from penetrating into the amorphous regions, which may result in poor dye fixation, poor lightfastness, and difficulty in achieving deep color expression in the resulting skin material. Furthermore, when the content (mass) of the heat-shielding agent is the same, a heat-shielding agent with a larger average particle size will have a smaller surface area than a heat-shielding agent with a smaller average particle size, which may result in reduced infrared reflectivity. The average particle size of the heat-shielding agent can be calculated by, for example, photographing the primary particle size of the heat-shielding agent using a transmission electron microscope and then statistically processing the photographed image. The volume-based circle-equivalent diameter is used to calculate the average particle size.

[0019] The content of the heat-shielding agent in the yarn containing the heat-shielding agent is not particularly limited, and is preferably, for example, 1.2 to 16 mass%. When the content is equal to or greater than the lower limit, infrared reflectivity is easily obtained. When the content is equal to or less than the upper limit, it is advantageous in terms of spinnability and yarn strength.

[0020] The fineness (single fiber fineness) of the fibers constituting the yarn containing the heat-shielding agent is not particularly limited, but is preferably 1 to 4 dtex. When the single fiber fineness is equal to or greater than the lower limit, sufficient strength for vehicle applications can be obtained. When the single fiber fineness is equal to or less than the upper limit, there are fewer voids between the fibers, so that infrared transmission can be suppressed. This improves infrared reflectivity, making it easier to suppress temperature increases in the vehicle interior.

[0021] The fineness (yarn fineness) of the yarn containing the heat-shielding agent is not particularly limited, but is preferably 40 to 440 dtex. When the fibrous substrate is a woven fabric, the yarn fineness is preferably 84 to 340 dtex. When the fibrous substrate is a knitted fabric, the yarn fineness is preferably 40 to 440 dtex, and more preferably 56 to 340 dtex. When the yarn fineness is equal to or greater than the lower limit, sufficient strength for vehicle applications can be obtained. When the yarn fineness is equal to or less than the upper limit, there are fewer gaps between the fibers, so that infrared transmission can be suppressed. This improves infrared reflectivity, making it easier to suppress temperature increases in the vehicle interior.

[0022] On the other hand, the yarn that does not contain a heat-shielding agent differs from the yarn that contains the heat-shielding agent only in that the yarn does not contain the heat-shielding agent, and various forms can be used, just like the yarn that contains the heat-shielding agent, and the single fiber fineness and yarn fineness can also be the same as those of the yarn that contains the heat-shielding agent.

[0023] The fibrous base material is a fiber fabric composed of the above-described yarns containing a heat-shielding agent and yarns not containing a heat-shielding agent, with the yarns containing the heat-shielding agent being arranged so that they do not expose more than 25% of the front surface of the skin material. Note that, as long as the above conditions are met, two or more types of yarns may be used as the yarns containing the heat-shielding agent and the yarns not containing a heat-shielding agent. In this embodiment, the fibrous base material can be produced, for example, by using a multilayer structure for a woven or knitted fabric, and using yarns containing a heat-shielding agent for at least some of the yarns constituting the back surface, or, in a structure having an intermediate layer, using yarns containing a heat-shielding agent for at least some of the yarns constituting the intermediate layer and / or the back surface. In this case, it is preferable to use yarns not containing a heat-shielding agent as the yarns mainly constituting the front surface. Furthermore, this is not limited to a multiple weave, but even in a single weave, it is possible to prevent the yarn containing the heat-shielding agent from being exposed to more than 25% of the front surface of the fibrous substrate by adjusting the combination of the surface float number, fineness (yarn containing a heat-shielding agent < yarn not containing a heat-shielding agent) and yarn density (yarn containing a heat-shielding agent < yarn not containing a heat-shielding agent). Furthermore, when a raising process is performed to improve the design, feel and texture, the exposed rate of the yarn containing the heat-shielding agent can be reduced by raising the surface mainly composed of yarn not containing a heat-shielding agent. These methods can also be adopted in a multiple weave. The woven fabrics and knitted fabrics used in this embodiment are described in detail below.

[0024] As the woven fabric, a woven fabric having a structure with many floating threads or a multi-layer structure is preferred from the viewpoint of the uneven shape due to the weave structure and the exposure rate of the threads containing the heat-shielding agent on the front surface of the skin material.

[0025] Examples of fabrics with a structure with many floating threads include twill weave, satin weave, and variations thereof. Among these, from the viewpoint of the exposure rate of the threads containing the heat-shielding agent on the front side of the skin material, twill weave (four-ply or more) of 3 / 1 or more and satin weave of 5 or more layers are preferred.

[0026] Examples of fabrics having a multi-layered structure include double-layered fabrics such as warp double-layered fabrics, weft double-layered fabrics, and warp double-layered fabrics. Among these, double-layered fabrics using a structure with many floating threads (twill weave, satin weave) on the front side are preferred.

[0027] In a woven fabric, the yarn containing the heat-shielding agent is preferably used as either the warp yarn or the weft yarn, whichever has the smaller exposure rate, from the viewpoint of the exposure rate on the front surface of the skin material, and in the case of a multi-layered fabric, it is preferably used as the back yarn. Furthermore, the yarn containing the heat-shielding agent may be arranged alternately with the yarn not containing the heat-shielding agent.

[0028] The knitted fabric may be a weft knitted fabric or a warp knitted fabric.

[0029] The weft knitted fabric is preferably a circular knitted fabric. The circular knitted fabric may be single jersey or double jersey. Examples of single jersey knitting structures include inlay knitting, fleece knitting, and reversible jersey knitting. Examples of double jersey knitting structures include, from the perspective of the uneven shape of the knitting structure, a knitting structure in which the surface fabric structure formed by the surface yarn and / or intermediate yarn among the surface yarn, intermediate yarn, and back yarn is a knitting structure other than plain knitting, half jersey knitting, and smooth knitting (i.e., a knitting structure exposed on both the front and back sides), or a knitting structure in which the surface yarn and / or intermediate yarn acts as a connecting yarn to connect the surface fabric structure and the back fabric structure and form stitches on both the front and back sides, or a knitting structure having at least one of these. An example of a knitting structure other than plain knitting, half jersey knitting, and smooth knitting (i.e., a knitting structure exposed on both the front and back sides) is rib knitting (also known as rib knitting or rib knitting). Rib knitting is less likely to produce gaps between knitting yarns, and can enhance the infrared reflection effect. From the viewpoint of the exposure rate of the yarn containing the heat-shielding agent, the knitting structure of the lining structure formed with the back yarn is preferably a double jersey knit structure which is a plain knit or half plain knit. Among these, a double jersey knit structure is preferred in which the lining structure formed with the back yarn is a plain knit or half plain knit structure, and the face yarn or intermediate yarn acts as a connecting yarn to connect the face fabric structure and the lining structure and form stitches on both the front and back surfaces.

[0030] Examples of warp knitted fabrics include tricot knitted fabrics knitted with two or more reeds. Among these, from the viewpoint of the uneven shape due to the knitting structure and the exposure rate of the yarn containing the heat-shielding agent on the front side of the skin material, raised tricot knitted fabrics knitted with two reeds and tricot knitted fabrics knitted with three or more reeds are preferred, and tricot knitted fabrics knitted with three or more reeds are more preferred. For example, tricot knitted fabrics knitted with three or more reeds form a ground structure with knitting yarns introduced from two reeds, and multiple uneven shapes can be formed by selecting the yarn removal sequence and knitting structure of the knitting yarn introduced from the third reed. Tricot knitted fabrics knitted with three or more reeds are less likely to have gaps between the knitting yarns, thereby enhancing the infrared reflection effect. From the viewpoint of the feel and texture of the fiber fabric, tricot knitted fabrics knitted with six or fewer reeds are preferred.

[0031] From the viewpoint of the exposure rate of the yarn containing a heat-shielding agent on the front surface of the skin material, it is preferable that the knitting structure knitted with a reed that introduces a yarn containing a heat-shielding agent has a swing width that is the same as or smaller than that of the knitting structure knitted with a reed that introduces a yarn that does not contain a heat-shielding agent. For example, in the case of a raised product made of a two-reed tricot knitted fabric, it is preferable that the front yarn (yarn that does not contain a heat-shielding agent) has a cord knitting structure and the back yarn (yarn that contains a heat-shielding agent) has a denbigh knitting structure or a two-needle cord knitting structure.

[0032] From the viewpoint of the exposure rate on the front surface of the skin material, the yarn containing the heat-shielding agent is preferably used as the back yarn in the case of a multiple structure circular knitted fabric. In the case of a warp knitted fabric, it is preferably used as the yarn on the side that will become the back surface of the product. In detail, when the sinker loop surface is the front surface of the product, it is preferable to use a yarn containing the heat-shielding agent as the back yarn, and when the needle loop surface is the front surface of the product, it is preferable to use a yarn containing the heat-shielding agent as the front yarn. Furthermore, the yarn containing the heat-shielding agent may be arranged alternately with yarns that do not contain the heat-shielding agent.

[0033] The proportion (mass ratio) of the yarn containing the heat-shielding agent in the fibrous base material is not particularly limited, but is preferably 10 to 60 mass %, more preferably 15 to 45 mass %. When this proportion is equal to or greater than the lower limit, good infrared reflectivity is easily obtained, and temperature rise in the vehicle interior space is easily suppressed. When this proportion is equal to or less than the upper limit, good light resistance is easily obtained. In addition, a cost reduction effect can be achieved.

[0034] The basis weight of the yarn containing the heat-shielding agent contained in the fibrous base material is not particularly limited, and from the viewpoint of infrared reflectivity, it is 30 g / m 2 More preferably, it is 60 to 250 g / m 2 is.

[0035] By designing the proportion (mass ratio) of the yarns containing a heat-shielding agent contained in the fibrous base material and the basis weight of the yarns containing a heat-shielding agent contained in the fibrous base material to fall within the above-mentioned numerical ranges, the proportion (mass ratio) of the yarns containing a heat-shielding agent in the skin material and the basis weight of the yarns containing a heat-shielding agent in the skin material can be made to fall within the same numerical ranges.

[0036] The basis weight of the fibrous base material is not particularly limited, and is, for example, 180 g / m 2 It is preferable that the weight per unit area is equal to or greater than the lower limit. When the weight per unit area is equal to or greater than the lower limit, there are fewer gaps between the fibers, which makes it possible to suppress the transmission of infrared rays. This improves infrared reflectivity, making it easier to suppress temperature increases in the vehicle interior. There are no particular limitations on the upper limit of the weight per unit area, but from the viewpoint of weight reduction and cost, it is preferable that the weight per unit area is 530 g / m 2 It is preferable that:

[0037] The density of the fibrous substrate is not particularly limited. When the fibrous substrate is a woven fabric, the density of the fibrous substrate is preferably 80 to 350 warp threads / 25.4 mm and 40 to 180 weft threads / 25.4 mm. When the fibrous substrate is a knitted fabric, the density of the fibrous substrate is preferably 25 to 90 courses / 25.4 mm and 18 to 50 wales / 25.4 mm. When the density of the fibrous substrate is equal to or greater than the lower limit, there are fewer gaps between the fibers of the woven or knitted fabric, thereby suppressing the transmission of infrared rays. This improves infrared reflectivity and makes it easier to suppress temperature increases in the vehicle interior. This is also advantageous for improving the feel and abrasion resistance. When the density of the fibrous substrate is equal to or less than the upper limit, weight can be reduced. A good texture can be easily obtained.

[0038] The fibrous substrate may be subjected to processes such as presetting, scouring, dyeing, raising, heat treatment, and embossing, as necessary. From the viewpoint of forming multiple concave-convex shapes, the fibrous substrate is preferably one that has been raised or one that has been embossed using a mold having a concave-convex shape designed so that the root-mean-square slope (WΔq) of the waviness curve is 0.36 to 0.84. From the same viewpoint, it is also preferable to shrink the woven or knitted fabric through a dyeing process at high temperature and high pressure, and then perform so-called width setting and / or width adjustment in a heat treatment process using a heat setter or the like. By adjusting the density and concave-convex shapes of the woven or knitted fabric through these processes, the desired root-mean-square slope (WΔq) of the waviness curve can be obtained.

[0039] The fibrous substrate is preferably provided with a heat-shielding resin film containing a heat-shielding agent on at least a portion thereof. From the viewpoint of infrared reflectivity, the heat-shielding resin film is preferably provided on the entire surface of at least one side of the fibrous substrate. From the viewpoint of whitening resistance, the heat-shielding resin film is more preferably provided on the entire surface of the back side of the fibrous substrate.

[0040] The heat-shielding resin film contains a heat-shielding agent and a binder resin.

[0041] Examples of binder resins include acrylic resins, urethane resins, polyester resins, etc. These may be used alone or as a mixture of two or more.

[0042] The heat-shielding agent is not particularly limited, and conventionally known titanium oxide, titanium oxide surface-treated with an aluminum compound, zinc oxide, etc. can be used. These can be used alone or in combination of two or more. Among them, titanium oxide surface-treated with an aluminum compound is preferred from the viewpoint of its effect on the color of the skin material.

[0043] The average particle size of the heat-shielding agent is not particularly limited, but from the viewpoint of improving infrared reflectivity in the 800 to 1600 nm range, a particle size close to the infrared wavelength, specifically 0.5 to 2.0 μm, is preferred, and more preferably 0.8 to 1.6 μm. If the average particle size of the heat-shielding agent is below the lower limit, the heat-shielding agent is too small relative to the infrared wavelength, increasing the probability that the infrared rays will pass through without being reflected, which may result in a decrease in infrared reflectivity. If the average particle size of the heat-shielding agent exceeds the upper limit, the surface area of ​​a heat-shielding agent with a larger average particle size will be smaller than that of a heat-shielding agent with a smaller average particle size, assuming the same content (mass) of heat-shielding agent, which may result in a decrease in infrared reflectivity. The average particle size of the heat-shielding agent can be calculated, for example, by photographing the primary particle size of the heat-shielding agent using a transmission electron microscope and then statistically processing the photographed image. For example, a digital microscope (VHX-5000) manufactured by Keyence Corporation can be used to take a 2000x magnification photograph, and then the diameter measurement function of the main measurement can be used to calculate the average diameter of 10 titanium oxide particles.

[0044] The content of the heat-shielding agent contained in the heat-shielding resin film is not particularly limited, and is preferably, for example, 20 to 80 mass %. To achieve this, the content of the heat-shielding agent in the liquid resin composition for a heat-shielding resin film, converted to solids, may be 20 to 80 mass %. When the content is equal to or greater than the lower limit, infrared reflectivity is improved, making it possible to suppress temperature increases in the vehicle interior. When the content is equal to or less than the upper limit, it becomes easier to suppress the heat-shielding agent from falling off from the heat-shielding resin film, and it is possible to prevent problems such as the heat-shielding agent adhering to the front surface of the skin material when the skin material is wound up, and causing scum.

[0045] The amount (dry mass) of the heat-shielding agent contained in the heat-shielding resin film attached to the fibrous substrate is not particularly limited, and may be, for example, 10 to 25 g / m 2 It is preferable that the adhesion amount is equal to or greater than the lower limit, which improves infrared reflectivity and thereby suppresses temperature rise in the vehicle interior. When the adhesion amount is equal to or less than the upper limit, it becomes easier to suppress the heat-shielding agent from falling off from the heat-shielding resin film, and it is possible to prevent the heat-shielding agent from adhering to the front surface of the skin material when the skin material is wound up, which can prevent problems such as the generation of scum.

[0046] The amount of binder resin attached to the fibrous substrate (dry mass) is not particularly limited, and is, for example, 4 to 60 g / m 2 is preferably 6 to 40 g / m 2 When the amount of adhesion is equal to or greater than the lower limit, it is possible to prevent the heat-shielding agent from falling off from the fibrous base material. When the amount of adhesion is equal to or less than the upper limit, it is easy to obtain a good texture.

[0047] The content (solid content) of the binder resin contained in the heat-shielding resin film is not particularly limited, and is preferably, for example, 20 to 80 mass %. To achieve this, the content of the binder resin in the resin composition liquid for the heat-shielding resin film, calculated as the solid content, may be 20 to 80 mass %. When this content is equal to or greater than the lower limit, it becomes easier to prevent the heat-shielding agent from falling off from the heat-shielding resin film, and it becomes possible to prevent the heat-shielding agent from adhering to the front surface of the skin material during winding, which can cause problems such as the generation of scum. When this content is equal to or less than the upper limit, it becomes easier to obtain a good texture. Furthermore, it becomes possible to prevent a decrease in elongation and bending properties.

[0048] Various additives such as flame retardants, deodorizers, thickeners, catalysts, matting agents, smoothing agents (e.g., silicone oil), surfactants, fillers, leveling agents, crosslinking agents, and penetrating agents may be added to the binder resin within a range that does not impair the effects of this embodiment.

[0049] The viscosity of the heat-shielding resin film composition is not particularly limited, but is preferably 18,000 to 50,000 mPa·s. If the viscosity is below the lower limit, the heat-shielding resin film composition will penetrate between the fibers of the fibrous substrate, reducing its ability to fill the gaps between the fibers and potentially preventing a rise in temperature inside the vehicle cabin. If the viscosity exceeds the upper limit, problems such as smearing may occur during application.

[0050] The method for applying the liquid composition for a heat-shielding resin film to the fibrous substrate is not particularly limited, and examples thereof include knife coating, roll coating, spray coating, etc. Then, a heat-shielding resin film can be formed by heat treatment.

[0051] The amount of heat-shielding agent contained in the skin material is 10 g / m 2 By ensuring that the amount of heat-shielding agent is equal to or greater than the lower limit, good infrared reflectivity can be obtained, and temperature rise in the vehicle interior can be suppressed. The amount of heat-shielding agent contained in the skin material is preferably 10 to 40 g / m 2 and more preferably 10 to 25 g / m 2The amount of heat shielding agent is 40g / m 2 or less, the dyeability of the fiber is improved, resulting in good deep color expression and good lightfastness. When a heat-shielding resin film is provided on at least a portion of the material, it is possible to prevent problems such as the generation of residue due to the heat-shielding agent falling off from the heat-shielding resin film. Here, the amount of heat-shielding agent contained in the covering material is the sum of the amount of heat-shielding agent contained in the fibrous base material and the amount of heat-shielding agent contained in the heat-shielding resin film.

[0052] The basis weight of the skin material is not particularly limited, and may be, for example, 200 g / m 2 More preferably, it is 220 to 530 g / m 2 When the basis weight of the skin material is equal to or greater than the lower limit, there are fewer gaps between the fibers, which makes it possible to suppress the transmission of infrared rays. This improves infrared reflectivity, making it easier to suppress temperature increases in the vehicle interior. When the basis weight of the skin material is equal to or less than the upper limit, it is preferable in terms of weight reduction and cost.

[0053] The density of the skin material is not particularly limited. When the fibrous substrate is a woven fabric, the density of the skin material is preferably 80 to 350 warp threads / 25.4 mm and 40 to 180 weft threads / 25.4 mm. When the fibrous substrate is a knitted fabric, the density of the skin material is preferably 25 to 90 courses / 25.4 mm and 18 to 50 wales / 25.4 mm. When the density of the skin material is equal to or greater than the lower limit, there are fewer gaps between the fibers of the woven or knitted fabric, which can suppress the transmission of infrared rays. This improves infrared reflectivity and makes it easier to suppress temperature increases in the vehicle interior. This is also advantageous for improving tactile feel and abrasion resistance. When the density of the skin material is equal to or less than the upper limit, weight can be reduced. A good texture can be easily obtained.

[0054] The vehicle skin material according to this embodiment has an infrared reflectance of 80% or more at the front surface in the wavelength range of 800 to 1600 nm. This makes it possible to suppress heat accumulation in areas susceptible to the effects of solar radiation, particularly in the dashboard and upper door trim. This makes it possible to suppress heat transfer and heat movement due to thermal radiation from these areas susceptible to the effects of solar radiation to the interior space of the vehicle, thereby suppressing temperature increases in the interior space of the vehicle.

[0055] The vehicle covering material according to this embodiment has a root mean square slope (WΔq) of the waviness curve of the front surface in the range of 0.36 to 0.84. The root mean square slope (WΔq) of the waviness curve is a parameter determined by averaging the slope of the waviness curve in a specific range, and can be determined in accordance with JIS B0601 (2001). The root mean square slope (WΔq) of the waviness curve is an index of the slope angle of the uneven structure formed on the front surface of a vehicle skin material. When the root mean square slope (WΔq) of the waviness curve is within the above range, sunlight entering the vehicle interior space is more easily reflected toward the window glass. This makes it easier for the light energy from sunlight to be released outside the vehicle interior, suppressing the rise in temperature inside the vehicle interior. Note that a root mean square slope (WΔq) of 0.36 of the waviness curve corresponds to an average slope of the waviness surface of 20°, and a root mean square slope (WΔq) of 0.84 of the waviness curve corresponds to an average slope of the waviness surface of 40°.

[0056] In Japan's summer, the solar inclination angle (the solar inclination angle around noon) at which solar energy irradiation is at its maximum is 60 to 70°, while the solar inclination is smaller outside of noon. Therefore, if the average inclination of the undulating surface (concave-convex surface) of the front surface of a vehicle skin material is 20 to 40°, sunlight can be reflected at an angle of nearly 0° in areas susceptible to sunlight (e.g., the dashboard, upper door trim, tonneau cover, trunk, etc.). This facilitates reflection of sunlight entering the vehicle interior toward the window glass, which facilitates the release of sunlight energy outside the vehicle, thereby suppressing the rise in temperature inside the vehicle interior. Note that "reflecting at an angle of nearly 0°" refers to reflection in the state shown in Figure 1. Specifically, in a skin material 1 having the above-mentioned WΔq, this refers to reflecting incident sunlight A toward the light source or toward the windshield 22, not retroreflection. In Figure 1, the reflected light B of incident sunlight A is shown as typical reflected light B against the irregularities on the front surface of the covering material 1, so it appears as if retroreflection is occurring, but in reality, sunlight is incident at various angles on the irregularities formed on the front surface of the covering material, so sunlight is not necessarily reflected back in the same direction by retroreflection.

[0057] According to this embodiment, the amount of heat-shielding agent contained in the skin material is 10 g / m 2 By ensuring that the reflectance of the front surface is 80% or more in the infrared wavelength range of 800 to 1600 nm, it is possible to suppress temperature rise in the vehicle interior. The uneven shape provided on the front surface of the skin material also suppresses temperature rise in the vehicle interior, and by setting the design of the fibrous base material, post-processing, and a combination of these, it is possible to easily set the root-mean-square slope (WΔq) of the waviness curve of the front surface of the vehicle skin material within the above range.

[0058] The brightness of the front surface of the skin (the side facing the interior of the vehicle) (L *) is preferably 50 or less, more preferably 35 or less, from the viewpoint of producing a dark color that minimizes reflection on the windshield. However, if dashboard reflection can be eliminated through recent innovations in windshields, there is no problem even if the brightness exceeds 50.

[0059] In addition, the brightness (L * ) is measured as follows: A color difference meter (for example, a color difference meter CR-400 manufactured by Konica Minolta, Inc.) is used to measure the reflectance spectrum using a D65 light source, and color calculation software is used to calculate the reflectance based on the measured values.

[0060] The vehicle skin material according to the embodiment is preferably used in vehicle interior materials such as automobile interior materials, particularly in areas exposed to direct sunlight, and can be particularly suitably used in dashboards, door trim uppers, etc. From the viewpoint of heat-shielding effect, it can also be used in other areas not exposed to direct sunlight, such as seat main materials and side materials.

[0061] The various numerical ranges described in this specification can be arbitrarily combined with their upper and lower limits, and all such combinations are considered to be preferred numerical ranges described in this specification. Furthermore, a numerical range described as "X to Y" means from X to Y. [Example]

[0062] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0063] Each evaluation item was performed according to the following method.

[0064] [Infrared reflectance] A test piece measuring 70 mm in width and length was collected. The test piece was attached to a UV-Vis-NIR spectrophotometer (UV-3600, Shimadzu Corporation) equipped with an integrating sphere accessory (ISR-3100, integrating sphere inner diameter 60 mm, Shimadzu Corporation). The front side of the test piece was attached facing the light source. Using BaSO4 powder as a white reference plate, light in the wavelength range of 800 to 1600 nm was emitted from the UV-Vis-NIR spectrophotometer's light source, and the reflectance was measured.

[0065] [Root mean square slope of waviness curve (WΔq)] A test piece measuring 100 mm in width and length was taken. The front surface of the test piece was photographed at 100x magnification using a microscope (digital microscope VHX-5000, manufactured by Keyence Corporation) to capture a contour curve using the 3D shape measurement function. Using the attached analysis software, the waviness curve of the entire width (3406 μm) of the photographed image was analyzed at 2.2 μm intervals. The test piece was divided into nine 25.4 mm grids, and photographs and analysis were performed for each section. The average value of these was taken as the root-mean-square slope (WΔq) of the waviness curve.

[0066] [Temperature test] A windshield 22 identical to that of a Midget II (Daihatsu Motor Co., Ltd.) was fitted to the cut surface of a 60L polystyrene foam box, with the short side cut at a 40° angle.A light adjustment plate 23 (13 cm wide, 32 cm long, made of the same material as the polystyrene foam box) was then placed on top of the windshield 22 to create a test box 25 scaled down to the size of an actual car (external diameter: depth 32.5 cm, height 22 cm, width (top) 48 cm, width (bottom) 58 cm; internal diameter: depth 29.5 cm, height 19 cm, width (top) 45 cm, width (bottom) 55 cm). Next, test specimen 24 (13 cm wide, 25 cm long) was placed in a position equivalent to the dashboard (below windshield 22) so that the halogen lamp would illuminate the front surface of the test specimen 24. A 500 W halogen lamp 21 (Caster Lighting Japan Co., Ltd., Super Halogen Lamp CHP-500) was then placed 29 cm from test specimen 24 at an incident angle of 60°, the same angle at which sunlight exposure is greatest in Japan. The halogen lamp 21 was irradiated for 15 minutes (Figure 2). The temperature change inside the test box was recorded using a temperature sensor 26 (T&D Corporation, Stainless Steel Protection Sensor TR-1320) and a temperature data logger (T&D Corporation, TR-71U) installed in the center of the test box. The temperature difference (temperature rise) inside the test box before and after irradiation with the halogen light was calculated and evaluated according to the following criteria. (Evaluation criteria) ◎: 5.0℃ or less ○: Over 5.0℃ to 5.5℃ ×: Over 5.5℃

[0067] [L * value] Using a color difference meter (Color Difference Meter CR-400, manufactured by Konica Minolta, Inc., D65 light source), measure the brightness L of the front surface of the test piece. * The value was measured at four points, and the L * The average value was calculated and rounded off to two decimal places and expressed as a whole.

[0068] [Design] The front surface of the skin material was visually inspected and subjected to a sensory evaluation according to the following evaluation criteria. (Evaluation criteria) ○: Warm impression of fibrous material, excellent design ×: The resin has a strong inorganic feel and is poor in design.

[0069] [Touch] The front surface of the skin material was stroked with a hand and subjected to a sensory evaluation according to the following evaluation criteria. Average or better is acceptable. (Evaluation criteria) ○: Soft, feels like a fibrous base material △: Slightly hard and feels rough to the touch ×: Hard and feels like a plastic plate

[0070] [Lightfastness] A test piece measuring 70 mm in width and 45 mm in length was taken. The front surface of the test piece was irradiated with light (65 W / m) using a xenon tester (Ci4000, manufactured by Atlas) under an environment with a black panel temperature of 89±3°C and 50±5% RH. 2 The test pieces were irradiated with continuous light (300-400 nm) until the total irradiation dose reached 90 MJ. Before and after the test, the test pieces were graded using a gray scale for discoloration in accordance with JIS L0804. Grade 3 or above was considered a pass.

[0071] [Heat-shielding agent shedding] Cellophane tape (Cellotape CT405AP-24, manufactured by Nichiban Co., Ltd.) was lightly applied to the back surface of the test piece (the surface on which the heat-shielding resin film was formed), and then the tape was peeled off. The peeled tape was observed and subjected to a sensory evaluation according to the following evaluation criteria. A score of △ or higher was considered to be acceptable. (Evaluation criteria) ○: No powder adhesion △: Slight powder adhesion ×: Powder adhered

[0072] [Example 1] An eight-ply satin fabric (warp density 108 / 25.4mm, weft density 66 / 25.4mm, grey width 157cm) was woven using a 167dtex / 48f / 2 semi-dull polyester 1H textured yarn for the warp and an 84dtex / 72f / 4 heat-shielding polyester false-twist textured yarn for the weft (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0% by mass, heat-shielding agent particle diameter: approximately 1μm) with the weave shown in the weave diagram in Figure 3.

[0073] The obtained greige fabric was dyed black with a disperse dye using a jet dyeing machine at 130°C for 45 minutes, and then soaped at 75°C for 15 minutes to remove excess dye. Next, the machine width (setter pin width) was adjusted to 130 cm, and the fabric was heat-treated at 150°C for 2 minutes using a heat setter to produce a woven fabric of fibrous base material 1 (basis weight 224 g / m 2 , warp density of the fibrous base material: 130 / 25.4 mm, weft density: 80 / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 38 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 85 g / m 2 ) was obtained.

[0074] The heat-shielding resin film composition liquid of the following formulation 1 was applied to the back surface of the obtained fibrous substrate (the surface on which the warp threads are more visible) in an amount of 50 g / m using a knife coater. 2 The width of the machine was then adjusted to 130 cm, and the machine was heat-treated in a heat setter at 150° C. for 2 minutes to obtain the skin material of Example 1.

[0075] [Formulation 1: Liquid composition for heat-shielding resin film] Binder resin (urethane resin): 62 parts by weight (Superflex E-2000, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., solid content 50% by mass) Heat-shielding agent (titanium oxide surface-treated with aluminum compound): 10 parts by weight (Titanium Industries Co., Ltd., ST-750SA, solid content 100% by mass, average particle size 1 μm) Thickener: 2.7 parts by weight (DIC Corporation, Boncoat HV-E, solid content 31% by mass) 14% ammonia water: 1.5 parts by weight ·Water: 22.6 parts by mass Preparation method: The viscosity was adjusted with a thickener to 20,000 mPa·s (BII type viscometer (BMII type), manufactured by Toki Sangyo Co., Ltd., rotor: No. 4, 12 rpm, 23°C ± 2°C). The content of the heat shielding agent (converted to solid content) contained in the above formulation 1 was 23.9 mass %, and the content of the binder resin (converted to solid content) was 74.1 mass %.

[0076] [Example 2] In Example 1, before dyeing, the front side of the greige fabric (the side where the weft yarns are more visible) was raised using a clothed pile raising machine having 12 clothed pile rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the weaving start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the weaving yarns were scraped out to form loop pile. The rest of the process was the same as in Example 1, and the woven fabric of fibrous base material 2 (basis weight 226 g / m 2 , warp density of the fibrous base material: 131 / 25.4 mm, weft density: 80 / 25.4 mm, proportion of yarns containing heat-shielding agent in the fibrous base material: 38 mass%, weight of yarns containing heat-shielding agent in the fibrous base material: 86 g / m 2 The skin material of Example 2 was obtained in the same manner as in Example 1, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous base material (the surface on which more warp threads were visible), the width of the machine was adjusted to 129 cm, and the machine was heat-treated at 150°C for 2 minutes in a heat setter.

[0077] [Comparative Example 1] A skin material of Comparative Example 1 was obtained in the same manner as in Example 1, except that a heat-shielding resin film was not formed.

[0078] Comparative Example 2 A skin material of Comparative Example 2 was obtained in the same manner as in Example 1, except that the formulation of the liquid composition for a heat-shielding resin film was changed to Formulation 7 shown in Table 1.

[0079] [Table 1]

[0080] [Example 3] In Example 1, a 3 / 1 twill (four-way twill) fabric (warp density 86 / 25.4 mm, weft density 43 / 25.4 mm, grey width 190 cm) was woven using a 167 dtex / 48 f / 2 semi-dull polyester 1H textured yarn as the warp yarn and an 84 dtex / 72 f / 4 heat-shielding polyester false-twist textured yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, heat-shielding agent particle diameter: approximately 1 μm) as the weft yarn, and the fabric was woven in the same manner as in Example 1 except that the machine width (setter pin width) was adjusted to 150 cm during the heat treatment after dyeing and the fabric was heat-treated using a heat setter. 2 , warp density of the fibrous base material: 105 / 25.4 mm, weft density: 50 / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 33 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 82 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous substrate (the surface on which the warp threads are more visible) in a dry coating amount of 54 g / m using a knife coater. 2 The skin material of Example 3 was obtained in the same manner as in Example 1, except that the liquid composition for a heat-shielding resin film of Formulation 1 was applied to the back surface of the obtained fibrous base material (the surface on which more warp threads were visible), and then the machine width was adjusted to 150 cm and heat-treated at 150°C for 2 minutes in a heat setter.

[0081] [Example 4] In Example 3, before dyeing, the front side of the greige fabric (the side where the weft yarns are more visible) was raised using a clothed pile raising machine having 12 clothed pile rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the weaving start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the weaving yarns were scraped out to form loop pile. The fabric of fibrous base material 4 (basis weight 265 g / m) was produced in the same manner as in Example 3, except that the clothed pile was raised three times from the weaving start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the weaving yarns were scraped out to form loop pile. 2, warp density of the fibrous base material: 108 / 25.4 mm, weft density: 50 / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 33 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 87 g / m 2 The skin material of Example 4 was obtained in the same manner as in Example 3, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous base material (the surface on which more warp threads were visible), the width of the machine was adjusted to 149 cm, and the skin material of Example 4 was heat-treated at 150°C for 2 minutes in a heat setter.

[0082] Comparative Example 3 In Example 3, during the heat treatment after dyeing, the machine width was adjusted to 160 cm, and heat treatment was performed using a heat setter to obtain a woven fabric of the fibrous base material 5 (basis weight 225 g / m 2 , warp density of the fibrous base material: 99 / 25.4 mm, weft density: 50 / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 34 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 77 g / m 2 The skin material of Comparative Example 3 was obtained in the same manner as in Example 3, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous base material (the surface on which more warp threads are visible), the width of the machine was adjusted to 160 cm, and the skin material of Comparative Example 3 was heat-treated at 150°C for 2 minutes.

[0083] [Example 5] In Example 3, a double woven fabric (face side: 5-ply satin weave, warp density: 288 / 25.4 mm, weft density: 50 / 25.4 mm, grey width: 172 cm) was woven with the weave shown in the weave diagram of FIG. 5 using a 167 dtex / 48 f / 2 semi-dull polyester 1H-textured yarn as the warp yarn, a 167 dtex / 48 f / 1 semi-dull polyester 1H-textured yarn as the face yarn, and an 84 dtex / 72 f / 4 heat-shielding polyester false-twisted yarn as the back yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, heat-shielding agent particle size: approximately 1 μm). The fabric was woven with the fibrous base material 6 (basis weight: 480 g / m2) in the same manner as in Example 3. 2, warp density of the fibrous base material: 330 threads / 25.4 mm, weft density: 53 threads / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 17 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 82 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous substrate in a dry coating amount of 56 g / m using a knife coater. 2 The skin material of Example 5 was obtained in the same manner as in Example 3, except that the coating was performed so that the thickness of the coating was as follows:

[0084] [Example 6] In Example 5, before dyeing, the front side (five-ply satin weave side) of the greige fabric was raised using a clothed pile raising machine equipped with 12 pile clothed rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the weaving start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the weaving yarns were scraped out to form loop pile. The rest of the process was the same as in Example 5, and a woven fabric of fibrous base material 7 (basis weight 483 g / m 2 , warp density of the fibrous base material: 332 threads / 25.4 mm, weft density: 53 threads / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 17 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 83 g / m 2 The skin material of Example 6 was obtained in the same manner as in Example 5, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface of the obtained fibrous base material (the surface on which more weft yarns were visible), the width of the machine was adjusted to 149 cm, and the skin material of Example 6 was heat-treated at 150°C for 2 minutes in a heat setter.

[0085] Comparative Example 4 In Example 1, a 2 / 1 twill (three-way twill) fabric (warp density 104 / 25.4 mm, weft density 66 / 25.4 mm, grey width 190 cm) was woven using a 167 dtex / 48 f / 2 semi-dull polyester 1H textured yarn as the warp yarn and an 84 dtex / 72 f / 4 heat-shielding polyester false twist textured yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, heat-shielding agent particle diameter: approximately 1 μm) as the weft yarn, with the weave shown in the weave diagram of FIG. 6 . The rest of the process was the same as in Example 1, and a woven fabric of fibrous base material 8 (basis weight 260 g / m2 , warp density of the fibrous base material: 129 / 25.4 mm, weft density: 77 / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material: 37 mass%, weight of yarn containing heat-shielding agent in the fibrous base material: 96 g / m 2 A skin material of Comparative Example 4 was obtained in the same manner as in Example 1, except that the above-mentioned materials were prepared.

[0086] For Examples 1 to 6 and Comparative Examples 1 to 4, the details and evaluation of the obtained skin materials are shown in Tables 2 and 3. In Comparative Example 1, the amount of heat-shielding agent contained in the skin material was 10 g / m 2 In Comparative Example 2, the amount of the heat-shielding agent contained in the skin material was less than 10 g / m2, and the infrared reflectance of the front surface of the skin material in the wavelength range of 800 to 1600 nm was less than 80%, so sufficient infrared reflectivity was not obtained and the effect of suppressing the temperature rise in the vehicle interior was poor. 2 Since the root mean square slope (WΔq) of the waviness curve on the front surface of the skin material was below 0.36 to 0.84, the effect of suppressing temperature rise in the vehicle interior was poor. In Comparative Example 3, the root mean square slope (WΔq) of the waviness curve on the front surface of the skin material was outside the range of 0.36 to 0.84, so sufficient infrared reflectivity was not obtained and the effect of suppressing temperature rise in the vehicle interior was poor. In Comparative Example 4, the exposed rate of the yarn containing the heat-shielding agent on the front surface of the skin material exceeded 25%, so the light resistance was poor. In contrast, Examples 1 to 6 suppressed temperature rise in the vehicle interior and were also excellent in design, feel, and durability (light resistance and suppression of heat-shielding agent falling off).

[0087] [Table 2]

[0088] [Table 3]

[0089] [Example 7] Using a 28-gauge double-knit circular knitting machine, a circular knit fabric (double jersey, knit fabric density 32 courses / 25.4 mm, 27 wales / 25.4 mm, grey width 180 cm) was knitted with the knitting structure shown in the structure diagram in Figure 7 using knitting yarn F1: 167 dtex / 48 f / 2 semi-dull polyester 1H-textured yarn as Y1 and Y4, knitting yarn F2: 167 dtex / 144 f / 1 semi-dull polyester 1H-textured yarn as Y2 and Y5, and knitting yarn F3: 84 dtex / 72 f / 2 heat-shielding polyester false-twisted yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 μm) as Y3 and Y6.

[0090] The obtained greige circular knitted fabric was dyed black with a disperse dye using a jet dyeing machine at 130°C for 45 minutes, and then soaped at 75°C for 15 minutes to remove excess dye. The machine width was then adjusted to 150cm, and the fabric was heat-treated in a heat setter at 150°C for 2 minutes to produce a knitted fabric of fibrous base material 9 (basis weight 340g / m 2 The density of the fibrous base material is 33 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 19 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 64 g / m 2 ) was obtained.

[0091] The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (flat surface) of the obtained fibrous base material in a dry coating amount of 52 g / m using a knife coater. 2 The width of the machine was then adjusted to 150 cm, and the mixture was heat-treated in a heat setter at 150° C. for 2 minutes to obtain a skin material of Example 7.

[0092] [Example 8] In Example 7, before dyeing, the front side (the side with greater unevenness) of the greige knit fabric was raised using a clothed pile raising machine having 12 pile clothed rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the knitting start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the knitting yarn was scraped out to form loop pile. All other conditions were the same as in Example 7, and the knitted fabric of the fibrous base material 10 (basis weight 344 g / m 2, density of the fibrous base material 34 course / 25.4 mm, 30 wales / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material 19 mass%, basis weight of yarn containing heat-shielding agent in the fibrous base material 65 g / m 2 The skin material of Example 8 was obtained in the same manner as in Example 7, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (flat surface) of the obtained fibrous base material, the width of the machine was adjusted to 149 cm, and the machine was heat-treated at 150°C for 2 minutes in a heat setter.

[0093] [Example 9] In Example 8, a knitted fabric of the fibrous base material 11 (basis weight 348 g / m) was prepared in the same manner as in Example 8, except that the raising treatment was performed six times. 2 , density of the fibrous base material 35 course / 25.4 mm, 30 wales / 25.4 mm, proportion of yarn containing heat-shielding agent in the fibrous base material 19 mass%, basis weight of yarn containing heat-shielding agent in the fibrous base material 66 g / m 2 The skin material of Example 9 was obtained in the same manner as in Example 8, except that the back surface (flat surface) of the obtained fibrous base material was coated with the heat-shielding resin film composition liquid of Formulation 1, the width of the machine was adjusted to 148 cm, and the machine was heat-treated at 150°C for 2 minutes in a heat setter.

[0094] [Example 10] Using an 8-gauge double knit circular knitting machine, a circular knit fabric (double jersey (rubber tortoiseshell knit), knit fabric density 33 courses / 25.4 mm, 28 wales / 25.4 mm, grey width 178 cm) was produced with the knit structure shown in the structure diagram of Figure 8 using knitting yarn F1: 84 dtex / 72 f / 4 heat-shielding polyester false twist textured yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 µm) as Y2, Y4, Y6, and Y8, knitting yarn F2: 167 dtex / 144 f / 1 semi-dull polyester 1H textured yarn as Y1 and Y5, and knitting yarn F3: 167 dtex / 48 f / 1 semi-dull polyester 1H textured yarn as Y3 and Y7, and the rest was produced in the same manner as in Example 7 to produce a knitted fabric of fibrous base material 12 (basis weight 453 g / m 2The density of the fibrous base material is 39 courses / 25.4 mm, 35 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 47 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 212 g / m 2 A skin material of Example 10 was obtained in the same manner as in Example 7, except that a heat-shielding resin film was not formed.

[0095] [Examples 11 to 17] The skin materials of Examples 11 to 17 were obtained in the same manner as in Example 7, except that the formulation of the heat-shielding resin film composition liquid or the dry application amount was changed as shown in Tables 1, 4, and 5.

[0096] Comparative Example 5 In Example 7, a circular knit fabric (double jersey, knit fabric density 32 courses / 25.4 mm, 27 wales / 25.4 mm, grey width 180 cm) was produced in the same manner as in Example 7, except that a heat-shielding polyester false twist textured yarn of 84 dtex / 72 f / 4 (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass %, particle size: approximately 1 μm) was used as knitting yarn F1, a semi-dull polyester 1H textured yarn of 167 dtex / 144 f / 1 was used as knitting yarn F2, and a semi-dull polyester 1H textured yarn of 167 dtex / 48 f / 1 was used as knitting yarn F3, and the knit fabric was produced in the same manner as in Example 7, with the knit fabric having the knit structure shown in the structure diagram of FIG. 2 , density of fibrous base material 33 course / 25.4 mm, 30 wales / 25.4 mm, proportion of yarn containing heat-shielding agent in fibrous base material 65 mass%, basis weight of yarn containing heat-shielding agent in fibrous base material 223 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (flat surface) of the obtained fibrous substrate in a dry coating amount of 50 g / m using a knife coater. 2 A skin material of Comparative Example 5 was obtained in the same manner as in Example 7, except that the coating was performed so that the thickness of the coating was as follows:

[0097] For Examples 7 to 17 and Comparative Example 5, the details and evaluation of the obtained skin materials are shown in Tables 4 and 5. In Comparative Example 5, the exposed ratio of the yarn containing the heat-shielding agent on the front surface of the skin material exceeded 25%, and therefore the light resistance was poor. In contrast, Examples 7 to 17 suppressed temperature rise in the vehicle interior space and were also excellent in design, tactile feel, and durability (light resistance). In Example 14, the content of the heat-shielding agent contained in the heat-shielding resin film exceeded the preferred numerical range and the content of the binder resin contained in the heat-shielding resin film was lower than the preferred numerical range, and in Example 16, the adhesion amount (dry mass) of the heat-shielding agent contained in the heat-shielding resin film exceeded the preferred numerical range and the content of the binder resin contained in the heat-shielding resin film was lower than the preferred numerical range, so slight detachment of the heat-shielding agent was observed. In Example 17, the amount of heat-shielding agent contained in the skin material exceeded the preferred numerical range and the content of the binder resin contained in the heat-shielding resin film was lower than the preferred numerical range, so detachment of the heat-shielding agent was observed.

[0098] [Table 4]

[0099] [Table 5]

[0100] [Example 18] Using a 28-gauge tricot knitting machine, a heat-shielding polyester false-twist textured yarn F1: 84 dtex / 72 f / 1 (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 μm) was used as the front yarn for the front reed L1, a semi-dull polyester 1H textured yarn F2: 75 dtex / 24 f / 1 for the middle yarn for the middle reed L2, and a semi-dull polyester 1H textured yarn F3: 84 dtex / 36 f / 1 for the back yarn for the back reed L3.A three-reed tricot knit fabric (knit density 52 courses / 25.4 mm, 26 wales / 25.4 mm, grey width 184 cm) was knitted with the knitting structure shown in the structure diagram in Figure 9.

[0101] The obtained grey tricot knit fabric was dyed black with a disperse dye using a jet dyeing machine at 130°C for 45 minutes, and then soaped at 75°C for 15 minutes to remove excess dye. The machine width was then adjusted to 150 cm, and the fabric was heat-treated in a heat setter at 150°C for 2 minutes to produce a knitted fabric of the fibrous base material 14 (basis weight 284 g / m 2 The density of the fibrous base material is 58 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 18 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 51 g / m 2 ) was obtained.

[0102] The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (needle loop surface) of the obtained fibrous base material in a dry coating amount of 48 g / m using a knife coater. 2 The width of the machine was then adjusted to 150 cm, and the mixture was heat-treated in a heat setter at 150° C. for 2 minutes to obtain a skin material of Example 18.

[0103] [Example 19] In Example 18, before dyeing, the front side (sinker loop side) of the greige knit fabric was raised using a clothed pile raising machine having 12 pile clothed rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the knitting start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the knitting yarn was scraped out to form loop pile. All other conditions were the same as in Example 18, and a knitted fabric of fibrous base material 15 (basis weight 289 g / m 2 The density of the fibrous base material is 59 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 18 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 52 g / m 2 The skin material of Example 19 was obtained in the same manner as in Example 18, except that a needle loop surface (a surface of the needle loop surface) was prepared, and the heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (needle loop surface) of the obtained fibrous base material, and then the width of the machine was adjusted to 149 cm and heat-treated at 150°C for 2 minutes in a heat setter.

[0104] [Example 20] A knitted fabric of fibrous base material 16 (weight 284 g / m) was produced in the same manner as in Example 18, except that a three-bar tricot knitted fabric (knitted fabric density 52 course / 25.4 mm, 26 wales / 25.4 mm, grey width 184 cm) was produced in the knitting structure shown in the structure diagram of FIG. 10 using a knitting yarn F1: 84 dtex / 36 f / 1 semi-dull polyester 1H-textured yarn as the front yarn for front reed L1, a knitting yarn F2: 75 dtex / 24 f / 1 semi-dull polyester 1H-textured yarn as the middle yarn for middle reed L2, and a knitting yarn F3: 84 dtex / 72 f / 1 heat-shielding polyester false twist textured yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 μm) as the back yarn for back reed L3. 2 The density of the fibrous base material is 58 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 18 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 51 g / m 2 The skin material of Example 20 was obtained in the same manner as in Example 18, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (sinker loop surface) of the obtained fibrous base material.

[0105] [Example 21] In Example 20, before dyeing, the front side (needle loop side) of the greige tricot knit fabric was raised using a clothed pile raising machine having 12 pile clothed rollers and 12 counter pile rollers. In detail, the raising treatment was carried out three times from the knitting start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the knitting yarn was scraped out to form loop pile. The rest of the process was the same as in Example 20, and a knitted fabric of fibrous base material 17 (basis weight 289 g / m 2 The density of the fibrous base material is 59 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 18 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 52 g / m 2 The skin material of Example 21 was obtained in the same manner as in Example 20, except that a heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (sinker loop surface) of the obtained fibrous base material, the width of the machine was adjusted to 149 cm, and the machine was heat-treated at 150°C for 2 minutes in a heat setter.

[0106] [Example 22] The front reed L1 was knitted with a heat-shielding polyester false twist yarn F1 of 84 dtex / 72 f / 1 (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 μm) as the front yarn, and the back reed L2 was knitted with a semi-dull polyester 1H-textured yarn F2 of 84 dtex / 48 f / 1 as the back yarn. A two-reed tricot knit fabric (knit density: 67 courses / 25.4 mm, 36 wales / 25.4 mm, grey width: 19 mm) was produced with the knitting structure shown in the structure diagram in Figure 11. A knitted fabric of fibrous base material 18 (basis weight 202 g / m) was produced in the same manner as in Example 18, except that a fibrous base material 18 (basis weight 202 g / m) was knitted in a length of 100 cm, and that before dyeing, the front side (sinker loop side) of the greige tricot knit fabric was raised using a clothed pile raising machine having 12 pile clothed rollers and 12 counter pile rollers (specifically, the raising treatment was carried out three times from the knitting start direction at a clothed torque of 2.5 MPa and a cloth speed of 12 m / min, and the knitting yarn was scraped out to form loop pile). 2 The density of the fibrous base material is 85 courses / 25.4 mm, 44 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 50 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 101 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (needle loop surface) of the obtained fibrous base material in a dry coating amount of 52 g / m using a knife coater. 2 After coating so that the coating was as described above, the width of the machine was adjusted to 149 cm, and the machine was heat-treated in a heat setter at 150°C for 2 minutes. The same procedures as in Example 18 were repeated to obtain a skin material of Example 22.

[0107] Comparative Example 6 A three-bar tricot knitted fabric (knitted fabric density 52 courses / 25.4 mm, 26 wales / 25.4 mm, grey width 184 cm) was produced in the same manner as in Example 18, except that a knitted fabric of fibrous base material 19 (basis weight 284 g / m) was produced using a knitting yarn F1: 84 dtex / 36 f / 1 semi-dull polyester 1H-textured yarn as the front yarn for front reed L1, a knitting yarn F2: 75 dtex / 24 f / 1 semi-dull polyester 1H-textured yarn as the middle yarn for middle reed L2, and a knitting yarn F3: 84 dtex / 72 f / 1 heat-shielding polyester false twist textured yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle size: approximately 1 μm) as the back yarn for back reed L3. 2 The density of the fibrous base material is 58 courses / 25.4 mm, 30 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 18 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 51 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (needle loop surface) of the obtained fibrous base material 19 by a knife coater in a dry coating amount of 50 g / m. 2 A skin material of Comparative Example 6 was obtained in the same manner as in Example 18, except that the coating was performed so that the thickness of the coating was as follows:

[0108] Comparative Example 7 The knitted fabric of the fibrous base material 20 (basis weight 200 g / m) was prepared in the same manner as in Example 22, except that the tricot knitted fabric (knitted fabric density 67 courses / 25.4 mm, 36 wales / 25.4 mm, grey width 190 cm) obtained in Example 22 was not raised. 2 The density of the fibrous base material is 84 courses / 25.4 mm, 44 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 50 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 100 g / m 2 The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (needle loop surface) of the obtained fibrous base material in a dry coating amount of 50 g / m using a knife coater. 2 After coating so that the coating was as follows, the width of the machine was adjusted to 150 cm, and the machine was heat-treated in a heat setter at 150°C for 2 minutes. The same procedures as in Example 22 were repeated to obtain a skin material for Comparative Example 7.

[0109] [Comparative Example 8] A double Russell knitting machine with six 22-gauge reeds was used, and a full set of 84 dtex / 72 f / 4 heat-shielding polyester false-twisted yarn (heat-shielding agent: titanium oxide, heat-shielding agent content: 6.0 mass%, particle diameter: approximately 1 μm) was used as knitting yarn F1 in reeds L1 and L6, a full set of 84 dtex / 36 f / 1 semi-dull polyester raw silk was used as knitting yarn F2 in reeds L2 and L5, and a two-ply yarn of 75 dtex / 24 f / 1 semi-dull polyester split raw silk (16 divisions) and 75 dtex / 36 f / 1 semi-dull polyester false-twisted yarn was used as knitting yarn F3 in a 1-in-1-out configuration in reeds L3 and L4, and a double Russell knit fabric was produced according to the structure below. The resulting knitted fabric was center-cut to obtain a grey double raschel knitted fabric (knitted fabric density 40 courses / 25.4 mm, 22 wales / 25.4 mm, grey width 174 cm). Reed L1:0-1 / 2-1 Reed L2:0-1 / 2-1 Reed L3:1-0 / 1-0 / 0-1 / 0-1 Reed L4: 1-0 / 1-0 / 0-1 / 0-1 Reed L5:0-1 / 2-1 Reed L6:0-1 / 2-1

[0110] The obtained grey double raschel knitted fabric was dyed black with a disperse dye using a jet dyeing machine at 130°C for 45 minutes, and then soaped at 75°C for 15 minutes to remove excess dye. The machine width was then adjusted to 145cm, and the fabric was heat-treated in a heat setter at 150°C for 2 minutes to produce a knitted fabric of the fibrous base material 21 (basis weight 448g / m 2 The density of the fibrous base material is 43 courses / 25.4 mm, 26 wales / 25.4 mm, the proportion of yarns containing a heat-shielding agent in the fibrous base material is 13 mass%, and the weight of the yarns containing a heat-shielding agent in the fibrous base material is 57 g / m 2 ) was obtained.

[0111] The heat-shielding resin film composition liquid of Formulation 1 was applied to the back surface (ground texture surface) of the obtained fibrous base material in a dry coating amount of 52 g / m using a knife coater. 2The width of the machine was then adjusted to 145 cm, and the mixture was heat-treated in a heat setter at 150° C. for 2 minutes to obtain a skin material of Comparative Example 8.

[0112] Comparative Example 9 A resin dashboard material (Daihatsu Motor Co., Ltd., Daihatsu Move X SA, model released in July 2023, interior color black) was used as Comparative Example 9. The material of the resin dashboard material is polypropylene resin blended with ethylene-propylene rubber and 20% talc filler.

[0113] For Examples 18 to 22 and Comparative Examples 6 to 9, the details and evaluation of the obtained skin materials are shown in Tables 6 and 7. In Comparative Examples 6 and 7, the exposed rate of the yarn containing the heat-shielding agent on the front surface of the skin material exceeded 25%, resulting in poor light resistance. In Comparative Example 8, the root mean square slope (WΔq) of the waviness curve on the front surface of the skin material was outside the range of 0.36 to 0.84, resulting in insufficient infrared reflectivity and poor suppression of temperature rise in the vehicle interior. In Comparative Example 9, the root mean square slope (WΔq) of the waviness curve on the front surface of the skin material was outside the range of 0.36 to 0.84, resulting in insufficient infrared reflectivity and poor suppression of temperature rise in the vehicle interior. Furthermore, since the skin material was not made of a fibrous base material, the design and feel were poor. In contrast, in Examples 18 to 22, the temperature rise in the vehicle interior was suppressed and the design, feel, and durability (light resistance and suppression of heat-shielding agent shedding) were excellent.

[0114] [Table 6]

[0115] [Table 7]

Claims

1. A skin material made of a fibrous base material having at least a portion of yarn containing a heat-shielding agent, wherein the heat-shielding agent contained in the skin material is 10 g / m ２ or above, wherein an exposed rate of yarns containing a heat-shielding agent on the front surface of the skin material is 25% or less, the front surface of the skin material has an infrared reflectance of 80% or more in the wavelength range of 800 to 1600 nm, and the root-mean-square slope (WΔq) of a waviness curve on the front surface of the skin material is in the range of 0.36 to 0.

84.

2. 2. The vehicle covering material according to claim 1, wherein a resin film containing a heat-shielding agent is applied to a back surface of the fibrous base material.

3. The weight of the skin material is 200 g / m ２ The vehicle skin material according to claim 1 or 2.

Images