JPH0374001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flexible thermosensitive electric wire used in electric heating devices such as electric blankets and electric carpets.

Conventional examples and their problems Conventionally, electric heating devices made of cloth, mainly electric blankets, have no protection against dirt, and especially when the electric part is inside the electric blanket itself, there has been a problem that it cannot even be washed with water. However, washing with water can be made possible by taking measures to prevent corrosion of connection pins and tracking between terminals. However, large laundry items such as blankets are not easy to wash at home, and electric heating devices are most desirable if they can be dry cleaned by a professional. When dry cleaning conventional electric blankets, the following major problems arose:

(1) The electrically insulating outer sheath of flexible thermosensitive wires used as heaters and temperature sensors is made from a plasticized polyvinyl chloride composition, and is not coated with dry cleaning solvents such as petroleum or perchloroethylene (tetrachlorethylene). As a result, the plasticizer is eluted, the flexibility is lost, and the thickness of the coating is greatly reduced.

(2) The electrical properties of the polymer temperature-sensitive layer vary greatly.

OBJECTS OF THE INVENTION An object of the present invention is to solve the conventional drawbacks and to obtain a flexible thermosensitive electric wire that can be attached to a fabric electric heating device such as an electric blanket to enable dry cleaning.

Structure of the Invention The present invention provides a flexible thermosensitive electric wire in which a polymer temperature-sensitive layer is formed between a pair of flexible electrodes and a jacket is provided on the outside of the wire, at least one part of the jacket. The dry cleaning solvent is characterized by being made of a barrier polymer material against dry cleaning solvents selected from vinyl alcohol copolymers, acrylonitrile copolymers, fluorine-containing polymers, metal chelate-containing polymers, or highly crystalline polyolefins. do. The outer sheath is made of a dry cleaning solvent barrier polymer material to protect the inside and enable dry cleaning of the flexible thermosensitive wire. Here, the polymer temperature-sensitive layer refers to a temperature fuse layer,
Refers to a polymer thermometer layer, a resistance layer with a large positive temperature coefficient of resistance (hereinafter abbreviated as PTC), etc. The temperature fuse layer is made of a crystalline thermoflexible resin such as nylon 12, and the polymer thermistor layer reduces impedance with respect to temperature rise.
It is made of polymeric thermosensitive material or polymeric semiconductor material based on polyvinyl chloride or nylon. PTC
The resistive layer is comprised of a composite composition in which conductive particles, such as carbon black, are dispersed in a crystalline polymer matrix.

On the other hand, in dry cleaning, ethylene chloride such as trichlorethylene and tetrachlorethylene and petroleum are generally used as cleaning agents.

Barrier polymer materials used in the present invention against petroleum and ethylene chloride as detergents include:
It is a material with excellent solvent resistance and non-affinity, and many materials with hydrogen bonds and highly crystalline materials have this property. Specifically, (1) polyfluorinated vinyl;
Fluorine-containing polymers such as polyvinylidene fluoride,
(2) Acrylonitrile copolymers such as NBR, (3) Polyamides such as nylon 11 and 12, (4) Vinyl alcohol copolymers such as ethylene-vinyl alcohol copolymers and partially saponified ethylene-vinyl acetate copolymers. polymers, (5) ionomers, metal chelate-containing polymers such as ethylene maleate metal salts, (6)
There are polymers such as highly crystalline polyolefins such as high-density polyethylene and polypropylene. These polymers or compositions using them as a base polymer are suitable as the barrier polymer material of the present invention.

In addition, when the electrically insulating outer covering has a multilayer structure, the inner layer is made of electrically insulating or barrier polymer material against dry cleaning solvents, and the outer layer is made of a polymer material that does not elute with the solvent or has barrier properties against dry cleaning solvents. Preferably, the barrier polymer material is used as the inner layer, and the outer layer is made of an inexpensive, flexible, and flame-retardant non-leaching polymer material, such as vinyl chloride soft copolymer or It is preferable to use vinyl chloride polymer alloy or the like. The vinyl chloride soft copolymer includes ethylene-vinyl chloride copolymer and ethylene-vinyl acetate-vinyl chloride copolymer. Examples of vinyl chloride polymer alloys include alloys of NBR (nitrile butadiene rubber) and polyvinyl chloride (PVC), alloys of chlorinated polyethylene and PVC, and alloys of ethylene-vinyl acetate copolymer and PVC. .

Moreover, among the flexible thermosensitive electric wires in the present invention,
In a temperature sensor using a polymer thermistor material, both electrodes in a pair function as a detection line for temperature signals, but if one of the electrodes is also used as a heating line, it can function as both a sensor and a heater. It becomes a thermal heater wire.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 shows a partially cutaway side view of an embodiment of the flexible thermosensitive wire of the present invention.

In the figure, 1 is a flexible core thread, 2 is an internal electrode, 3 is a polymer temperature-sensitive layer, 4 is an external electrode, 5 is an inner barrier polymer layer, 6 is an outer barrier polymer layer, 7
indicates a non-leaching envelope.

The configuration of the present invention will be explained.

2000 denier polyester flexible core thread 1
As shown in Figure 1, a stainless steel foil with a width of 0.32 mm and a thickness of 0.05 mm is wound with a pitch of 0.7 mm to form the internal electrode 2, and on top of that is an ion-conducting polymeric wire with an organic perchlorate as a carrier. The hot body layer 3 was tubed to a thickness of 0.28 mm. An external electrode 4 was formed thereon with an externally wound stainless steel foil. After that, nylon 12
(Daicel Co., Ltd.'s Diamid) and vinyl alcohol copolymer (Kuraray Co., Ltd.'s Eval) in sequence, approximately 0.1
An inner barrier polymer material layer 5 and an outer barrier polymer layer 6 were formed with a thickness of mm. Next, an ethylene-vinyl chloride copolymer was used as the non-leaching jacket 7.
It was coated with a thickness of 0.4 mm. The thus obtained flexible thermosensitive wire was immersed in perchloroethylene (tetrachlorethylene) for about 24 hours, air-dried for 24 hours → 80℃ for 24 hours, and then its impedance-temperature characteristics were measured. The change was extremely small compared to Example B.

The figure shows the characteristic curve of 60Hz, 1m length, conventional example B is after immersion, A1 and A2 are the characteristic curve of this example, A1
is before immersion, and A2 is after immersion.

Next, a second embodiment having a structure as shown in FIG. 1 will be described.

2000 denier polyester core thread 1, internal electrode of inner wound copper wire (width 0.38 mm, thickness 0.07 mm, pitch 0.8
mm) 2, temperature fuse layer (nylon 12, 0.26mm
thickness) 3, and external electrode of outer wound copper wire (width 0.38 mm,
4) having a thickness of 0.07 mm and a pitch of 1.8 mm were sequentially formed, and then a barrier polymer material layer 5 similar to that in Example 1 was formed to obtain a flexible thermosensitive wire.

The flexible heat-sensitive wire was immersed in a petroleum-based dry cleaning solvent (Daikyo Sekiyu Co., Ltd. "Daisol") for 24 hours, air-dried for 24 hours → 80℃ for 24 hours, and then heated in a furnace at 1℃/min to 150℃.
When the temperature was further increased and the temperature of the fuse was measured, it fused at a heater temperature of approximately 178°C. on the other hand,
With conventionally constructed plasticized vinyl chloride jacketed heaters, the heater loses its flexibility after immersion drying, and in the same temperature fuse test as above, the fusing operation was unstable and the heater temperature reached a high temperature of 198°C to 230°C. There was a large variation in the fusing characteristics.

FIG. 3 shows a flexible thermosensitive wire having a second structure of the present invention.

Inner wound electrodes 2, 14 (copper foil, width 0.43 cm,
A PTC resistance layer 13 made of ethylene-vinyl acetate copolymer containing 19% carbon black was formed, and as a barrier layer 15, polyvinyl fluoride was tubed to a thickness of 0.15 mm. It was formed by After that, ethylene-
0.5mm polymer alloy of vinyl acetate copolymer and PCV
It was coated with a thick coating to form an outer cover 8. After heat-treating this flexible thermosensitive wire and immersing it in perclene for 3 hours,
Air dry for 24 hours, then dry at 80℃ for 16 hours to determine the resistance temperature characteristics.
When comparing before and after immersion in Parkren, the resistance of the wire without a barrier layer changed by about 20 times and did not return to the original resistance value, whereas the flexible thermosensitive wire of this example showed the resistance as shown in Fig. 4. As such, the changes were very small.

The figure shows a resistance value characteristic curve for a length of 1 m, Y is the conventional example after immersion, X1 and X2 are those of this embodiment, A1 is after immersion, and A2 is before immersion.

According to this embodiment, by forming the barrier layer, it is not affected by dry cleaning solvents such as petroleum and ethylene chloride.
Produces the effect of protecting the inside.

Effects of the Invention As described above, according to the flexible thermosensitive electric wire of the present invention, dry cleaning of electric heating equipment is possible without any change in characteristics during dry cleaning, and comfortable electric heating equipment that can be used cleanly and completely. We can provide the ingredients. In the present invention, the barrier polymer layer is formed immediately outside the polymer temperature-sensitive layer as in the above embodiment, and if it is formed as the outermost shell layer of the electrically insulating jacket, the inner layer can be easily coated. Can be protected against cleaning solvents.

The present invention produces an industrially applicable effect that enables dry cleaning of cloth electric heating devices.

[Brief explanation of drawings]

FIG. 1 is a step-cut side view of one embodiment of the flexible thermosensitive wire of the present invention, FIG. 2 is an impedance-temperature characteristic diagram of the flexible thermosensitive wire of FIG. 1 and a conventional example, and FIG. The figure shows a step-cut side view of an embodiment of the PTC heat-sensitive wire of the second structure of the present invention, and FIG. 4 shows a resistance-temperature characteristic diagram of the PTC heat-sensitive wire of FIG. 3 and a conventional example. 1, 1': Flexible core thread, 2: Internal electrode, 3:
Polymer thermosensitive layer, 4: External electrode, 5: Inner barrier polymer layer, 6: Outer barrier polymer layer, 7:
non-eluting jacket, 8: jacket, 13: PTC resistance layer,
14: electrode, 15: barrier layer.

Claims (1)

[Scope of Claims] A flexible thermosensitive electric wire comprising a polymer thermosensitive layer formed between a pair of flexible electrodes and a jacket provided on the outside thereof, wherein at least at least one of the jacket layers is provided. Part of the material is composed of a barrier polymer material against dry cleaning solvents selected from ethylene vinyl alcohol copolymer, acrylonitrile copolymer, fluorine-containing polymer, metal chelate-containing polymer, or highly crystalline polyolefin. Features flexible heat-sensitive wire. 2 The outer cover has a multi-layer structure, the inner layer is made of an electrically insulating or barrier polymeric material against dry cleaning solvents, and the outer layer is made of a polymeric material that does not elute with the solvent or has barrier properties. A flexible thermosensitive electric wire according to scope 1. 3. The flexible thermosensitive electric wire according to claim 2, wherein the non-eluting polymeric material is a vinyl chloride soft copolymer or a polyvinyl chloride polymer alloy.