JPS63122402A - Heat generable shoes - Google Patents

Abstract

(57) [Summary] 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 shoe having an insole, and more specifically, a shoe having a heat generating element made of heat generating rubber having a self-temperature control ability and capable of generating heat to maintain a predetermined temperature. Regarding shoes.

(Prior Art) In conventional shoes, an insole made by cutting a sheet of vinyl chloride or felt into a predetermined shape is simply inserted into the shoe, but the insole alone can cause wear and tear on the user's fingers, especially in the winter.

It was not possible to keep the tip warm for a long time.

Therefore, various types of shoes have been conventionally provided in which a heating element is embedded in the shoes to keep the shoes warm, as disclosed in, for example, Japanese Utility Model Application No. 58-84707, Japanese Utility Model Publication No. 60-8723, and the like.

(Problem to be solved by the invention) However, according to conventional heat-retaining shoes, the heating element used therein is made by impregnating or mixing carbon black into heating wire such as nichrome wire, cloth, or synthetic fiber. However, it has the disadvantage that it cannot maintain a constant temperature and consumes a lot of power.

The present invention is intended to improve such problems, and aims to provide shoes using a heating element that can always maintain a constant temperature without attaching a thermistor or the like.

(Means for Solving the Problems) That is, the present invention is characterized by embedding a heating element in a shoe and installing a battery connected by a lead wire inside the chaise or outside the shoe. In the shoe, the shoe is capable of generating heat using a heating element having a self-temperature control ability as the heating element,
According to the shoes of the present invention, the inside of the shoe can be kept warm by causing the heating element, which can self-control the temperature to a constant temperature, to generate heat to a constant temperature just before and after wearing the shoes in winter.

(Example) Examples of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partially cutaway plan view of the bottom of the shoe of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG. 1 is a sectional view of a heating element according to the present invention, and an insole (1) is provided on the bottom of the shoe of the present invention.
This insole (1) is made of vinyl chloride, felt, etc. and has a total thickness of approximately 1.0 to 20 mm.
It is a laminated plate-like body, and has almost the same shape as the bottom of the shoe. In addition, in the shoes of the present invention, the insole is not necessarily used during the day.

A heating element (2) is embedded in the tip region of this insole (1), that is, near where the fingertip is placed, and the other insole (1)
) A replaceable battery (3) is buried near the central region of the battery (3) which is not subject to much pressure. The above heating element (2)
A lead wire (4) is buried between the insole (11) and the lead wire (4), but the switch (5) is exposed on the side wall of the insole (11).

As shown in FIG. 3, the heating element (2) includes a heating rubber (6) and flexible electrode materials (7), such as metal-attached fiber electrode materials, laminated on both sides of the heating rubber (6). Furthermore, a lead wire (4) is soldered to each electrode material (7), and the surrounding area is covered with a cover material (8) such as vinyl chloride.

The heat-generating rubber (6) has self-temperature control properties by dispersing conductive carbon black and short fibers in the rubber. Examples of the rubber used here include natural rubber, polybutadiene rubber, and polypropylene rubber. There are isoprene rubber, styrene-butadiene copolymer rubber, nitrile rubber, butyl rubber, chloroprene rubber, acrylonitrile-butadiene copolymer, ethylene-propylene copolymer rubber, silicone rubber, etc. Of these, two types of rubber are used. It is also possible. In order to improve mechanical strength and heat resistance, the above-mentioned rubber is a rubber that can be structured with sulfur, a sulfur compound, or a peroxide, or is used after being crosslinked.

Further, as the conductive carbon black, commonly used furnace black, acetylene black, thermal black, channel black, etc. are used, and the specific surface area (iodine adsorbent) is 20 to 70 mg/g.
It is preferable that the strafture (DBP oil absorbent ml/100g) is 100 or more.

The amount of the carbon blank added is 10 to 50 parts by weight, preferably 30 to 40 parts by weight, per 100 parts by weight of rubber. If the amount is less than 10 M parts, the resistance value of the heat generating rubber becomes too large and the heating element do not become. On the other hand, if it exceeds 50 parts by weight, PTC characteristics will not be exhibited and accurate self-temperature control will not be possible.

And as short fibers, polyethylene terephthalate,
Organic fibers such as polybutylene terephthalate, polypropylene, polyethylene, polyether ether ketone, aliphatic polyamide, aromatic polyamide, cotton, vinylon, rayon, acrylic, or inorganic fibers such as glass, ceramic, carbon, metal, etc., singly or in combination, or It is used as a composite yarn (conjugate yarn), and among these, polyethylene terephthalate, polybutylene terephthalate, or composite yarns of polyethylene terephthalate having different molecular weights are preferred.

The above-mentioned short fibers are a necessary component for exhibiting the excellent PTC properties of the heat-generating rubber of the present invention and providing very accurate self-temperature control. At the same time, the filling amount, length, thickness and aspect ratio of the above-mentioned short fibers are also small (the above-mentioned PTC
It is affecting the characteristics.

The filling amount of the short fibers is 0.5 to 20 vol%, preferably 1 to 15 vol%, and the fiber length is 20 μm or more, the fiber diameter is 0.05 μm or more, and the aspect ratio is 2.
0 or more, preferably 100 to 3,500, and the short fibers are dispersed in the heating element in an oriented or random state and discontinuously. A heat-generating rubber using short fibers that satisfies these conditions has great PTC characteristics.

In particular, when polyethylene terephthalate, polybutylene terephthalate, or polyethylene terephthalate composite yarn is used, it has relatively superior P compared to other short fibers.
It was found that it has TC characteristics. As the filling amount of short fibers increases, the PTC properties tend to decrease, and a similar tendency occurs as the aspect ratio decreases.

The exothermic rubber in the present invention expands or contracts as the temperature rises or falls. At that time, it is known that the interfacial region between the short fibers mixed and dispersed in the rubber and the rubber, particularly the end portion, undergoes large local deformation. This creates an environment in which the carbon black struttle present in this region is likely to be destroyed or bonded in accordance with the expansion or contraction of the heat-generating rubber. Compared to conventional heating elements, local deformation is large even with slight temperature changes, so it has greater PTC characteristics. It is presumed that one of the reasons why this heating element rubber exhibits excellent PTC properties is the presence of short fibers.

Further, in this case, the matrix is preferably different from the short fibers; for example, if it is a synthetic resin, the strain distribution that occurs at both end regions of the short fibers is unlikely to occur, so rubber is most preferable.

Of course, in the present invention, a heat-generating rubber having the above-mentioned composition is most preferred, but a foamed heat-generating rubber can also be used without being limited thereto.

The heating element (2) can adjust the heating temperature to be constant in proportion to the voltage applied to it, and is usually 1.0
A ~15V battery is used, and the temperature rise from the ambient temperature is set at 10~40°C.

In addition, as for the application method, the lead wire (4) provided on the heating element (2) is taken out to the outside of the shoe and connected to an external battery (not shown) with a switch provided outside the shoe. . 1. of the external battery. Although not particularly limited, it may be attached to the outer wall of the shoe, for example.

Fig. 4 shows the relationship between the surface temperature of the bottom surface of the shoe and the time when the heating element (2) is installed in the shoe of the present invention.
℃), it reaches a nearly constant temperature in about 10 minutes, demonstrating excellent self-control temperature ability. The heating element inserted into the shoe had dimensions of 20 x 20 x 2 mm, and the temperature was measured on the surface of the insole using a thermocouple.

(Effects) As described above, according to the shoes of the present invention, a heating element made of heating rubber that has self-temperature control ability is embedded in the insole, and this allows the temperature inside the shoe to be controlled at a constant level, resulting in a simple structure. It becomes a shoe that can generate heat.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of the bottom of the shoe of the present invention;
Figure 2 is a cross-sectional view taken along the line A-A in Figure 1, Figure 3 is a cross-sectional view of a heating element used in shoes, and Figure 4 is a cross-sectional view of the shoes when a constant voltage is applied at a predetermined environmental temperature. It is a graph showing the relationship between the surface temperature of the bottom surface and time. (11... Insole (2)... Heating element (3)
...Battery (5)...Switch (6)...
・Exothermic rubber patent applicant Tsuebelt Co., Ltd. Fig. 1 Fig. 2 Fig. 3 Fig. 4 Kanae (minute 2 procedure + LE old (spontaneous) May 1986 θ flash i

Claims (1)

[Claims] In shoes capable of generating heat, in which a heating element is embedded within the shoe and a battery connected by a lead wire is installed inside or outside the shoe, a heating element made of heating rubber having self-temperature control ability is used as the heating element. Shoes that can generate heat.