JPS6359480A - Heat insulating fiber sheet - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heat-retaining fiber sheet.

More specifically, the present invention relates to a fiber sheet having a metal powder-containing resin layer that is breathable and has a high heat retention property due to a radiation reflection effect against heat.

[Conventional technology]

Conventionally, in order to maintain high heat retention by imparting heat radiation and reflection effects, there is a nonwoven fabric with a composite structure in which metal is vapor-deposited on a 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 layer 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 B/metal thin film layer/fiber sheet and 3
In order to form a layered structure and provide 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.

All of these methods use metal vapor deposition, a discontinuous processing method under high reduced pressure, and also involve a complicated process of joining the metal thin film layer, which has been deposited by vapor deposition, and the short fiber web layer using a transfer method or the like. is necessary.

On the other hand, the metal vapor deposited layer formed using these methods has an excellent radiation reflection effect against heat and has excellent properties as a heat insulator. The adhesive strength is weak, and the metal layer tends to peel off and fall off due to washing, rubbing, and friction caused by wearing.

In order to prevent the metal layer from peeling off and IvDR falling off, it is common to provide a thin polymer film layer on top of the metal vapor deposited layer as described above, but the thin polymer film layer has poor air permeability and permeability. It has the drawbacks of loss of moisture and rough texture.

In order to improve this drawback, some methods have created cracks in the metal thin film layer and polymer thin film layer, but this requires a fairly complicated process, and this method also improves the decrease in air permeability and moisture permeability to some extent. Although it can be done, it is difficult to improve it across the board.

[Problem that the invention seeks to solve]

The purpose of the present invention is to improve the above-mentioned drawbacks of the prior art, to have excellent washing resistance, flexibility, and without impairing breathability and moisture permeability.
The present invention aims to provide a metal-containing resin-processed fiber sheet that has high heat retention properties due to its radiation reflection effect.

[Means for solving problems]

The present invention has the following configuration to achieve the above object.

That is, it is based on a heat-retaining fiber sheet characterized by an array of single fibers to which resin containing metal powder is attached on at least one surface.

Further, the present invention will be explained in detail.

FIG. 1 is an enlarged cross-sectional view of a single fiber showing the main part of the heat-retaining sheet according to the present invention.

FIG. 2 is a partially sectional perspective view showing an example of the heat retaining sheet according to the present invention.

FIG. 3 is a partially sectional perspective view showing another aspect of the heat retaining sheet according to the present invention.

In FIG. 1, 1 is a single fiber whose outer periphery is covered with a resin layer 2 containing metal powder 3. In FIG.

FIG. 2 shows an embodiment in which only one side of the nonwoven fabric 5 is coated with the metal powder-containing resin layer 4, and FIG. 3 shows an embodiment in which both sides of the nonwoven fabric 55 are coated with the metal powder-containing resin layer 4.

In the present invention, resins containing metal powders include acrylic resins, styrene-butadiene resins, nitrile-butadiene resins, PVC copolymers, vinyl acetate resins, etc.
Or, in the case of producing a nonwoven fabric in combination, the resin used as a binder includes aluminum, zinc, gold, silver, copper,
It is a resin composition containing metal powders such as chromium, titanium, nickel, nichrome, etc., either alone or in combination. Of course, the resin composition containing metal powder as described above may be further mixed with a pigment, ceramic powder, etc. to change the hue. The thickness of the resin thin film containing metal powder is preferably thinner, since a thicker resin film will have a rougher, harder texture, and is desirably formed to a thickness of 50 microns or less, preferably 10 microns or less.

When the metal powder is attached to the fiber sheet, it may be applied evenly to one or both surfaces of the fiber sheet, or it may be applied partially to necessary areas.

The amount of adhesion also varies depending on the basis weight of the fiber sheet, but if it is too small, the effect of improving heat retention will be small, and if it is too large, the texture will become hard and the metal powder will easily fall off. Further, although it varies depending on the specific gravity of the metal powder used, the amount of metal powder attached is 0.5% to 40.0% by weight, preferably 2.0% to 40.0% by weight, based on the basis weight of the fiber sheet after processing the metal powder-containing resin.
It is preferable to set it to 10°0%.

Although it is desirable that the thin film of the metal-containing resin attached to the surface of the single fiber covers the entire surface of the single fiber, it may cover only a portion of the surface of the single fiber.

In the present invention, the fiber sheet refers to a nonwoven fabric.

There is no limit to the basis weight, thickness, fineness, etc., but if it is applied to clothing, the basis weight is 10 to 5009 depending on the purpose of use.
/m2, thickness 0.1~100mm, 'a degree 0.1~1
It is desirable to have a denier of approximately 0 denier.

The fibers constituting the nonwoven fabric may be any fibers that can constitute the nonwoven fabric, such as natural fibers such as cotton, synthetic fibers such as polyester, polyamide, polypropylene, etc., alone, or a mixture of these fibers.

As a method for forming a thin film of resin containing metal powder on the surface of a single fiber, known methods such as a dipping method, a passing method, and a spraying method can be applied.

Through these processing methods, resin containing metal powder can be
By attaching the single fiber web to one side, both sides, the entire surface, or even partially, the surface of the single fibers is coated with a resin containing metal powder.

As mentioned above, the heat-retaining fiber sheet according to the present invention can be applied to the process of manufacturing ordinary non-woven fabrics, only requires an additional operation of mixing metal powder into the binder resin, is inexpensive, and does not change air permeability. It is possible to produce a fiber sheet that has high heat retention properties due to the radiation reflection effect without causing heat retention.

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: ASTM D-1518-57T breathability
: JIS L-1096 Frazier method Thickness : Measured under a load of 1 g/-.

(Example) Example 1 2.0 weight fM% of aluminum powder with a particle size of 0.5 microns was added to an acrylic binder [binder concentration 5% (acrylic resin 100 parts, crosslinking catalyst 1 part, stabilizer 1 part)] Using the mixed binder, a polyester web with a single fiber count of 1 denier and a basis weight of 100 g/'m2 is treated in the following process, and the amount of solid content including aluminum powder adhered to is 20? J/m2.

The aluminum powder-containing resin-processed fiber sheet obtained by using the above-mentioned binder and undergoing a step of dip nip front spray drying and back spray drying (120'CXa minutes) had a thickness of 8 mm and exhibited a high heat retention property of 2.3 CIO. The ventilation rate was 165 cm3/cm2.sec, and no aluminum was observed to fall off during washing or dry cleaning.

Comparative Example Example 1 was treated in the same manner using an acrylic binder containing no aluminum powder, and the solid content coverage was 16y/m2.

The woven sheet produced by this conventional method has a thickness of 9 mm and 1.5
It showed a heat retention property of 01o. Also, the ventilation volume is 1000m3/
cm2・SeC.

The above results are summarized and shown in Table 1. Heat retention is increased by 0.1 clo by using aluminum-containing resin on one side of the fiber sheet. Furthermore, by processing both sides, the price increases by 0.4 clo.

However, the more aluminum-containing resin is processed, the harder the texture becomes, so processing needs to be done according to the intended use.

〔Effect of the invention〕

As mentioned above, the metal-containing resin-processed fiber sheet of the present invention has
(1) It has high heat retention properties due to radiation reflection.

(2) There is little change in the properties of the fiber sheet.

(3) Can be processed on one side, both sides, or the entire surface depending on the purpose of use.

(4) Can be washed with water or dry cleaned.

(5) The manufacturing method is not much different from conventional methods and can be processed at low cost.

It has excellent characteristics such as. 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, kotatsushiki, cooling pipe insulation, and as a thermal insulation material for various industries. A wide range of applications can be expected by combining it with other materials.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a single fiber forming the main part of the heat-retaining sheet according to the present invention. FIG. 2 is a partially sectional perspective view showing an example of the heat retaining sheet according to the present invention. FIG. 3 is a partially sectional perspective view showing another embodiment of the heat retaining sheet according to the present invention. 1: Single fiber 2: Resin layer 3: Metal powder 4: Metal powder-containing resin layer 5: Nonwoven fabric

Claims (3)

[Claims] (1) A heat-retaining fiber sheet characterized in that single fibers to which resin containing metal powder is attached are arranged on at least one surface. (2) 0.5 to 40.0% based on the weight of the fiber sheet
A heat-retaining fiber sheet according to claim (1), which contains metal powder. (3) The heat-retaining fiber sheet according to claim (1), which has an air permeability of 1 cm^3/cm^2·sec or more.