JPH01104865A - Highly air-permeable high heat insulating fiber sheet - Google Patents

Abstract

PURPOSE: To obtain a highly air-permeable and high heat-retaining fiber sheet, in which single fiber layer of web surface part is fixedly attached by a ceramic- containing resin to constitute a network structure layer, excellent in shape stability and durability and suitable for skiing wear. CONSTITUTION: This highly air-permeable and high heat-retaining fiber sheet is obtained by fixedly attaching preferably 3-10 single fiber layers of surface part of web 2 with a ceramic, (e.g. zirconia)-containing resin 3, (e.g. acrylic resin, preferably containing a ceramic and a metal such as aluminum) to constitute network structure layer 4.

Description

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

[Conventional technology] Conventionally, in order to improve the heat retention of fiber sheets, fiber sheets were made with thinner fibers and increased number of immobile air layers to improve heat retention, or by adding a radiation reflection effect to 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/ Metal thin film layer/fiber sheet and 31! ! form a structure,
In addition, in order to impart moisture permeability, metal thin film laminated fiber sheets are known in which cracks are formed in the polymer thin film layer/metal thin film layer.

[Problems to be Solved by the Invention] As a result of studies on heat retention, air permeability, and form stability, which were achieved only as alternatives in the prior art, the present invention has developed a web surface layer made of a ceramic-containing resin. By creating a network structure, these can be achieved simultaneously at a high level. [Means for solving the problems] In order to achieve the above object, the present invention adopts the following configuration. It is something. That is, (1) the single fibers on the surface of the web are made of ceramic (
2) The highly air permeable and highly heat retaining fiber sheet according to claim (1), wherein the network structure layer is composed of two or more layers of single fibers on the surface of the web.

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

(4) The highly breathable and highly heat-retaining fiber sheet according to claim (1), wherein there are at least two network structure layers.

(5) The highly air-permeable and 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 has an area of 10 cm3/ctit
・Claim No. (1) having an air flow rate of sec or more
The highly breathable and highly heat-retaining fiber sheet described in 1.

The present invention is characterized in that the single fibers on the surface of the web are fixed with a ceramic-containing resin to form a network structure.

Such resin is applied to the surface layer of the web, i.e., from the surface to the surface.
It is formed by penetrating into two or more surface layers of the Ii miscellaneous layer, that is, by adhering and fixing the resin to the surface of the single fibers or the intertwined portions of the single fibers.

The depth of penetration of the resin of the present invention may be in the range of 273 to 1/2 of the thickness of the extreme surface layer of the web as long as it has a network structure, but preferably two or more single fiber layers, preferably The thickness of about 3 to 10 layers, specifically 1 to 1Qmm, preferably 3 to 5 mm, is selected from the viewpoint of flexibility and sheet properties.

FIG. 1 is a cross-sectional perspective 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 by infiltrating and fixing a resin 3 containing a mixture of ceramic powder and metal powder in a ratio of 2:1 into the surface layer, and the surface layer has entangled parts and single fibers. The resin adheres to the surface portion, forming the mesh 4. Therefore, the fiber sheet of the present invention exhibits excellent shape retention properties and has almost no change in air permeability compared to before resin application.

In FIG. 2, the resin 3 forms a network structure on both sides of the front and back layers of the web 2. In FIG.

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

Of course, the fiber sheets shown in FIGS. 1 and 2 may be arbitrarily laminated, and sheet structures in which these sheets are laminated with at least one other non-woven fabric or woven or knitted material can also be used. Demonstrates the characteristics of a synthetic fiber sheet.

The resin referred to in the present invention includes acrylic resin, styrene butadiene resin, nitrile butadiene resin, PvC copolymer,
Resins commonly used as binders can be used, 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 foil, granules, or fibers, granules are preferably selected for industrially dispersing resins containing them.

Such granules are selected to have a particle size of 0.05 to 10 μm, preferably 0.1 to 3 μm, from the viewpoint of retention, flexibility, and prevention of nozzle clogging during spraying and falling off after processing. . Moreover, if the particle size is too small, the cost required to finely grind the particles will increase.

As a method for applying a resin containing ceramic or a mixture of ceramic and metal to the web surface, known methods such as a printing method, a spraying method, and a gravure roll method can be applied, but in particular, a spraying method is applicable. is preferred.

In addition, the viscosity of the resin containing ceramic or a mixture of ceramic and metal varies depending on the processing method, but in the case of the spray method, it is about 5 to 50 Ct) (25 °C), and more preferably 10 to 20 CI) (25 °C) It is.

If it is lower than this, the resin will penetrate too much into the web, making it difficult to form a network structure on the surface layer of the web, and if it is too high, the resin will become independent on the surface, making it difficult to form a network structure in this case as well.

The Wffi of the ceramic is 0.5 to 50.0% by weight, preferably 2.0 to 30.0% by weight based on the fiber weight of the web.
The Shigesato% range is selected based on heat retention, texture, breathability, durability, etc. This amount of adhesion is the same even when metal is mixed, and the total amount is adjusted within the above range. Although the mixing ratio of ceramic and metal can be set arbitrarily, it is preferable that ceramic ω
Mix in a range of 0.1 to 10 times.

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 resin deposited is set within a range that does not inhibit the network structure and based on air permeability.

The present invention provides at least 10 CII1 fiber sheets as a whole.
3/Cf11・5eC1 preferably 50cm3/ai
-sec or more, particularly preferably 100c++3/a
It is characterized by a high airflow rate of i-sec iX.

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-mentioned air permeability.

For example, in the case of clothing, the nonwoven fabric may have a basis weight of 10 to 500Q/TIf, and a thickness of 0, depending on the purpose of the specification.
．． A web having a denier of about 1 to iomm and a fineness of about 0.1 to 10 denier is selected.

The fibers constituting the nonwoven fabric may be natural fibers such as cotton, synthetic fibers such as polyester, polyamide, polypropylene, or a mixture thereof.

The highly breathable and highly heat-retaining fiber sheet of the present invention is inexpensive and has high far-infrared emissivity and even 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 (clo): ASTM D-1518-57
(However, measurements were made with a 7 mm clearance between the hot plate and the sample.)

Air permeability: JIS L-1096 Frazier method Thickness: Measured under a load of 1 g/7.

Emissivity of far infrared rays: Emission spectrum measurement by FT-IR (device> I FS-113V (manufactured by Bruker)
(Detector > DTGS (Conditions) Resolution = 3 cm', Number of integrations - 256 times (Attachment) Attachment for emission spectrum measurement (Temperature) 60°C [Example] Example 1 Single yarn fineness 1 denier, basis weight 75 g/m2 The polyester web was processed in the following steps using the following binder containing zirconia powder, and the adhesion amount of solid content containing zirconia powder was set to 25 g/lT12.

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

Acrylic resin, B-15 (made by Nippon Acrylic ■) 100
Department.

Crosslinking agent, methylolmelamine (M3, manufactured by Sumitomo Chemical ■) 5
Department.

Catalyst, ACX (manufactured by Sumitomo Chemical) 0.5 part.

Stabilizer Neugen ET180 (manufactured by Daiichi Kogyo Seiyaku ■) 0.3
Department.

Solvent: Water (adjust resin solution viscosity to 1 ocp (25°C)).

Processing process: Web → Spray the above binder on the front surface Drying resistance (120" CXa min) → Spray the above binder on the back side Drying resistance (120℃ x 3 minutes) The amount of binder applied on the front and back sides is 60% on the surface, A mesh structure was formed as 40% of the back surface.

As shown in Table 1, the obtained fiber sheet having a network structure made of a zirconia-containing resin had a high emissivity of far-infrared rays. Also, the ventilation amount is 175CII13
/CIi.SeC, and no zirconia was observed to come off after washing with water or dry cleaning.

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

The obtained mesh-structured fiber sheet made of resin containing zirconia powder and aluminum powder had a thickness of 18 mm, had a high heat retention property of 2.1 C1o, and had a high far-infrared emissivity as shown in Table 1. Ta. Also, the ventilation amount is 1
7 Qcm3/cd·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.
5 (j/m2).The fiber sheet made by this conventional manufacturing method showed a heat retention property of 1.8 clo at a thickness of 1 gmm.The emissivity of far infrared rays was as shown in Table 1 from Example 1.2. It was low.

The ventilation amount was 170 cm3/crA.

The above results are summarized and shown in Table 1.

It can be seen from the table that the addition of zirconia increases the emissivity of far infrared rays with a wavelength of 10 μm.

Furthermore, it can be seen that when zirconia and aluminum are used together, the emissivity of far infrared rays with a wavelength of 10 μm increases as well as the heat retention property.

Further, from the results of Example 1.2, it can be seen that the far-infrared emissivity increases as the zirconia content m increases.

[Effect of the invention] The present invention provides far-infrared emissivity, thermal resistance (cl.

It is possible to provide an excellent fiber sheet that has high heat retention, high air permeability, and high web form stability and durability. The fiber sheet of the present invention has little change in sheet properties, can be washed with water and dry cleaned,
It has the feature that it can be provided at low cost. For this reason, it can be used not only as a thermal insulation W4 fiber sheet for clothing such as ski wear and winter clothing, but also as a material for bedding, kotatsu hooks, kotatsujiki, cooling pipe insulation, and as a heat insulation agent for various industries.
Or by combining it with other materials, a wide range of applications can be expected.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional perspective view showing an example of a highly breathable and highly heat retaining WAfIfi sheet according to the present invention. FIG. 2 is a sectional view showing another example of the highly breathable and highly heat-retaining fiber sheet of the present invention. FIG. 3 is a sectional view of the highly air permeable and 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: Network structure

Claims (6)

[Claims] (1) A highly breathable and highly heat-retaining fiber sheet characterized in that the single fibers on the surface of the web form a network structure of resin containing ceramic. (2) The highly breathable and highly heat-retaining fiber sheet according to claim (1), wherein the network structure layer is composed of two or more layers of single fibers on the surface of the web. (3) The highly breathable and highly heat-retaining fiber sheet according to claim (1), wherein the resin contains ceramic and metal. (4) The highly breathable and highly heat-retaining fiber sheet according to claim (1), wherein there are at least two network structure layers. (5) The highly air-permeable and 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 air permeable and highly heat retaining fiber sheet according to claim (1), which has an air permeability of c or more.