JPH01124685A - High heat insulating fiber sheet - Google Patents

Abstract

PURPOSE: To obtain a fiber sheet excellent in morphological stability and having both highly heat-insulating properties and air permeability by striatedly dispersing a resin containing ceramics and a metal all over the one side of a web. CONSTITUTION: This fiber sheet is obtained by dispersing and coating a resin 3 on a web 2, permeating and making thickwise striae 4 and forming a resin film not only on the web surface but also in the web and so the sheet has highly heat-insulating properties and >=10 cm<3> /cm<2> .s permeability wherein the web 2 comprises fiber 1 such as cotton or polyester short fiber and the resin 3 is acrylic resin, a styrene/butadiene resin or the like and contains ceramics (e.g. zirconia, silica or alumina having 0.05-10 μm particle diameter) or the ceramics and a metal (e.g. aluminum or zinc) and is dispersed and coated 0.5-50 wt.% based on fiber weight of the web by screen method or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fiber sheet that has not only excellent morphological stability but also high heat retention and high air permeability.

[Conventional technology] Conventionally, in order to improve the heat retention properties of fiber sheets, fiber sheets were made thinner and had more immobile air layers to improve heat retention, or they were made to have a radiation reflection effect against heat. In order to maintain high heat retention, there is a nonwoven fabric with a composite structure in which a metal is vapor-deposited on the nonwoven fabric and short fiber webs are bonded to the surface by needling. In addition, a metal thin film composite structure in which a fiber sheet layer and a short fiber web having a metal thin film on one side are laminated, or a structure in which a polymer thin film layer is coated to protect the metal thin film, and a polymer thin film layer/ A metal thin film laminated fiber sheet is known in which a three-layer structure is formed with a metal thin film layer/fiber sheet, and cracks are formed in the polymer thin film layer/metallic thin film layer in order to provide moisture permeability.

[Problems to be Solved by the Invention] As a result of studies on heat retention, air permeability, and morphological stability, which were achieved only as alternatives in the prior art, the present invention has developed a ceramic-containing resin that is applied to the web surface ( By dispersing and adhering it to the entire surface (back side),
It has been determined that these can be achieved simultaneously, and a fiber sheet that simultaneously achieves the above three performances at a high level has been provided. [Means for Solving the Problems] The present invention achieves the above objects. Therefore, the following configuration is adopted. That is, (1) A highly heat-retaining fiber sheet characterized in that a ceramic-containing resin is completely dispersed on at least one side of the web and independently permeates into the web.

(2) The high heat retention m-fiber sheet according to claim (1), wherein the permeation is in the form of streaks.

(3) The highly heat-retaining fiber sheet according to claim (1), wherein the resin contains ceramic and metal.

(4) The highly heat-retaining fiber sheet according to claim (1), wherein the web is laminated in at least two layers.

(5) The high heat retention fiber sheet according to claim (1), wherein the ceramic or the ceramic and metal are present in an amount of 0.5 to 50% based on the fiber weight of the web.

(6) The fiber sheet has a surface area of 10cm3/cm2-Se
The highly heat-retaining fiber sheet according to claim (1) has an air permeability of C or more.

The present invention is characterized in that the ceramic-containing resin is dispersed over the entire surface of the web.

Such resin permeates from the surface of the web to the inner layer, and it is particularly preferable that each resin is independent, that is, fixed in the form of a stripe. It is preferable that the resin stripes are joined to other fibers and form a stitch. The depth of penetration of the resin of the present invention, including such streaks, is within the range of up to 2/3 of the thickness of the web, preferably 1/2.
within the range.

The resin is preferably dispersed over the entire surface of the web to form a film in the form of dots, but generally speaking, the film has a diameter of 5000 times or less, preferably 1000 times or less, of the diameter of the single fibers constituting the web. The size is adjusted to . Moreover,
Preferably, each such membrane exists independently.

FIG. 1 is an enlarged cross-sectional view showing an example of a highly heat-retaining fiber sheet of the present invention. That is, although FIG. 1 shows a web 2 made up of short fibers 1, a long fiber web may also be used. This web 2 is made of a resin 3 containing a mixture of ceramic powder and metal powder, which is dispersed and adhered to the entire surface.Moreover, the resin 3 permeates independently in the thickness direction of the web cross section in the form of stripes 4, and other materials are roughly formed. It also joins with fiber 1 to form a network. Furthermore, the striped resin may be joined to another striped resin within the sheet. Therefore, the fiber sheet of the present invention exhibits excellent shape retention properties.

FIG. 2 shows another example of the present invention, which has a structure in which the semi-containing resin 3 permeates inward from the front and back surfaces of the web 2.

FIG. 3 shows an example in which three layers of the fiber sheets shown in FIG. 1 are laminated.

Of course, the highly heat-retaining fiber sheet of the present invention may also be a sheet structure in which the fiber sheets shown in FIG. 1 and FIG. Demonstrate the characteristics of

The resin referred to in the present invention includes acrylic resin, styrene-butadiene resin, nitrile-butadiene resin, PVC copolymer,
Resins commonly used as binders are applied, such as vinyl acetate resins, urethane resins, etc. alone or in combination.

The term "ceramic" used in the present invention refers to an inorganic sintered body, and generally refers to earthenware, ceramics, and the like. Such ceramics include, for example, zirconia,
Examples include silica, alumina, titanium oxide, etc., and mixtures thereof.

Furthermore, metals as used in the present invention include metals such as aluminum, zinc, gold, silver, copper, chromium, titanium, nickel, and nichrome, and alloys and mixtures thereof.

Although such ceramics and metals are effective as sheet structures in any form such as grains, fibers, etc., granules are preferably selected for industrially dispersing resins containing them.

Such granules are selected to have a particle diameter of 0.05 to 10 microns, preferably about 0.1 to 3 microns, from the viewpoint of retention, flexibility, and shedding after processing. Also, if the particle size is too small,
The cost required for finely pulverizing becomes large.

As a method for applying the resin containing ceramic or a mixture of ceramic and metal to the web surface, known methods for applying the resin partially or in spots, such as a flat screen method, a rotary screen method, and a gravure roll method, can be applied.

The viscosity of the resin containing ceramic or a mixture of ceramic and metal can be determined depending on the processing method, but it is usually about 300 to 1500 cp (25 °C), preferably about 500 to 5000 cp (25 °C). . If it is higher than this, the resin will not penetrate into the web, and if it is lower than this, the resin will flow and the dot-shaped film will not exist independently.

The amount of ceramic deposited is 0.0% based on the fiber weight of the web.
The range is selected from 5 to 50.0% by weight, preferably from 2.0 to 30.0% by weight, from the viewpoint of heat retention, feel, breathability, durability, etc. This adhesion M is the same when metals are mixed, and the total amount is adjusted within the above range. The mixing ratio of ceramic and metal can be set arbitrarily, but 1.
Preferably, they are mixed in an amount ranging from 0.1 to 10 times the amount of ceramic.

The resin film of the present invention has longitudinal streaks formed in random shapes not only on the surface but also on the inner layer of the web, and its performance is not determined by the thickness of the resin film that exists only on the surface.

The amount of resin deposited varies depending on the basis weight of the web, the specific gravity of the ceramic, and the specific gravity of the metal, but the upper limit of the total amount of deposited resin is set based on air permeability.

In the present invention, the fiber sheet as a whole has at least 10 cm3
/Cm2-SeC, preferably 50cm37cm2
- sec or more, particularly preferably 100cm37cm2
It is characterized by having a high air permeability of -5 ec' or more.

Furthermore, a fiber sheet subjected to the above-described processing can also be laminated on a conventional nonwoven fabric.

The fiber sheet as used in the present invention refers to a web or a lightly punched web-like nonwoven fabric from the viewpoint of total performance, but there are no restrictions on the basis weight, thickness, fineness, etc. In short, it is important that the nonwoven fabric satisfies the above ventilation m.

Examples of such nonwoven fabrics include, for example, in the case of clothing,
Depending on the specification purpose, the area weight is 10 to 500Q/m2, and the thickness is 0.
1-100mm, fineness 0. A web of about 1 to 10 denier is selected.

The fibers constituting this nonwoven fabric include natural fibers such as cotton, synthetic fibers such as polyester, polyamide, and polypropylene,
Alternatively, mixed fibers of these may be applied.

The heat-retaining fiber sheet of the present invention is inexpensive and has high far-infrared emissivity and high radiation reflectance without changing breathability.

The present invention will be explained in more detail with reference to Examples below.

Note that the thermal resistance value, air permeability, and thickness were measured by the following methods.

Thermal resistance value (clod: ASTM D-1518-57
T (however, measurements were made with a clearance of 7 mm between the hot plate and the sample).

Air permeability: JIS L-1096 Frazier method Thickness: Measured under a load of 1 g/cm2.

Emissivity of far infrared rays: Emission spectrum measurement by FT-IR (device) I FS-113V (manufactured by Broker>
(Detector > DTGS (Conditions) Resolution = 8 cm-1, Number of integration = 256 times (Attachment) Attachment for emission spectrum measurement (Temperature) 60°C [Example] Example 1 Single yarn fineness 1 denier, basis weight 75 C1 / m2 of polyester seaweed was processed in the following steps using the following binder containing zirconia powder, and the adhesion interval of solid content containing zirconia powder was set to 25 g/Tn2.

Binder: Acrylic binder with the following formulation and particle size 0
．． Fifty parts of 2μ zirconia powder was added.

[Formulation] Acrylic resin, 3-15 (manufactured by Nippon Acrylic ■) 100 parts Crosslinking agent, methylolmelamine (M3, manufactured by Sumitomo Chemical 1ttJ) 5 parts catalyst, ACX (manufactured by Sumitomo Chemical ■) 0.5 part acrylic thickener Stabilizer, ASE60 (manufactured by Japan 7')') nt1m) 0.5 parts Stabilizer, Neugen ET180 (Daiichi Kogyo Seiyaku (!1) 0, 3 parts Solvent: Water Resin solution viscosity: 1000 cp (25°C) [ Processing process] After rotary screen processing the above binder on the surface of the web, drying (120°C x 3 minutes), applying the above binder on the back side with a rotary screen, and drying again (
120°C x 3 minutes).

The amount of binder applied on the front and back surfaces was 60% on the front surface and 40% on the back surface.

The obtained resin-processed fiber sheet containing zirconia powder has a thickness of 15 mm, and has a heat retention property of 1.4 clo, which is the same as that of the comparative example (no zirconia added), but as shown in Table 1, it has a high emissivity of far infrared rays. I got something. Also, the ventilation amount is 16
0 cm3/cm2-sec, and no silconia was observed to come off during water washing or dry cleaning.

Example 2 In Example 1, the zirconia contained in the binder was changed to 35 parts, 15 parts of aluminum powder with a particle size of 0.5μ was added, and the solid content adhesion amount was changed to 250/m2 in the same manner as in Example 1. It was treated as

The resulting resin-processed fiber sheet containing zirconia powder and aluminum powder has a thickness of 14 mm and a heat retention capacity of 1.6 C.
As shown in Table 1, a product with a high far-infrared emissivity was obtained. Also, the ventilation volume is 155cm3
/cm2-sec, and no zirconia or aluminum was observed to come off during water washing or dry cleaning.

Comparative Example 1 In Example 1, a binder containing no zirconia powder was used, and the solid content adhesion was reduced to 2 in the same manner as in Example 1.
It was treated as 5q/Tr12. The fiber sheet manufactured by this conventional method had a heat retention property of 1.4 clo at a thickness of 15 mm. Furthermore, the far-infrared emissivity was lower than that of Example 1.2 as shown in Table 1.

The ventilation amount was 155 cm3/cm2.

The above results are summarized and shown in Table 1. By adding zirconia, the emissivity of far infrared rays with a wavelength of 10μ is 8%.
It gets expensive.

Also, by using zirconia and aluminum together,
Similarly, the emissivity of far infrared rays with a wavelength of 10 μ increases by 6%,
At the same time, the heat retention also increases by Q, 2CIO.

From the above, it can be seen that the far-infrared emissivity becomes higher when the zirconia content is higher than in Example 1.2.

[Effects of the Invention] The present invention provides an excellent fiber with high far-infrared emissivity, high thermal resistance (CLO value), high heat retention, high air permeability, high web form stability, and durability. We can provide sheets.

The fiber sheet of the present invention has the characteristics that there is little change in sheet properties, can be washed with water and dry cleaned, and can be provided at low cost. For this reason, it can be used not only as a thermal fiber sheet for clothing such as ski wear and winter clothing, but also as a material for bedding, kotatsu hooks, kotatsu mats, cooling pipe insulation, and as a heat insulating agent for various industries. A wide range of applications can be expected by combining it with other materials.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view showing an example of a highly heat-retaining fiber sheet according to the present invention. FIG. 2 is a sectional view showing an example of the highly heat-retaining fiber sheet of the present invention. FIG. 3 is a cross-sectional view of the highly heat-retaining fiber sheet made of three layers of fiber sheets shown in FIG. In the figure: 1: Short fiber 2: Web 3: Ceramic or resin containing ceramic and metal 4: Resin streak-like material Patent applicant Higashi Shi Co., Ltd. Kurashiki Textile Processing Co., Ltd. Figure 2

Claims (6)

[Claims] (1) A highly heat-retaining fiber sheet characterized in that a ceramic-containing resin is completely dispersed on at least one side of the web and independently permeates into the web. (2) The highly heat-retaining fiber sheet according to claim (1), wherein the permeation is in the form of streaks. (3) The highly heat-retaining fiber sheet according to claim (1), wherein the resin contains ceramic and metal. (4) The highly heat-retaining fiber sheet according to claim (1), wherein the web is laminated in at least two layers. (5) The highly heat-retaining fiber sheet according to claim (1), wherein the ceramic or the ceramic and metal are present in an amount of 0.5 to 50% based on the fiber weight of the web. (6) The fiber sheet is 10cm^3/cm^2・se
The highly heat-retaining fiber sheet according to claim (1), which has an air permeability of c or more.