JPH07870B2 - Suede-like seat - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention is a suede-like sheet having flexibility and antistatic property,
In particular, the present invention relates to a suede-like seat suitable for use as a vehicle interior seat.

<Prior Art> It is well known that an impact due to static electricity is generated when a vehicle is dismounted after a driving operation. This is because the human body is charged to a high potential by rubbing against the interior material (eg seat) inside the vehicle, and when this touches a conductor, a large amount of static electricity suddenly flows in a moment. This is a spark discharge phenomenon.

Conventionally, a means for weaving conductive fibers has been known as an antistatic measure for textile products. This type utilizes a mechanism in which static electricity charged in a textile product is collected in a conductive fiber and discharged from the tip of the fiber by corona discharge to eliminate static electricity in the textile product. However, even if such a means is used, the corona discharge effect (current collection effect) of the textile product
It is not very satisfactory as a surface material for automobile seats, and the electricity storage effect (condenser effect) of the conductive fiber itself is extremely small. For example, due to contact with other objects such as a human body charged at high potential. It is hardly expected that the static electricity will escape to the sheet and be removed.

Therefore, for the purpose of static elimination effect, a conductive backing agent layer containing 20% to 50% of carbon fine particles on the back surface of a fiber sheet mixed with conductive fibers (surface resistance of 10 ⁶ Ω or less).
It has been proposed as a static eliminator sheet in which the above is integrated and the backing agent layer is grounded (Actual No. 60-40497).

<Problems to be Solved by the Invention> When a conventional seat is used as a surface material for a car seat, when the seat and the human body are in contact with each other from the beginning, static electricity charged on the seat and the human body is always caused by conductive fibers and backing. The static potential of the two does not rise because they flow through the material layer to the vehicle body and are discharged, but when the human body separates from the seat, the human body caused by the separation of the seat and the human body (clothes) or friction causes a high potential. It is observed that when the sheet and human body are re-contacted with each other, a remarkable spark discharge is generated. A phenomenon similar to this also occurs when a human body charged to a high potential by another cause comes into contact with the same sheet. Such a phenomenon is the same as the spark discharge when a human body charged at a high potential comes into contact with a good conductor such as metal. Therefore, the seat is not necessarily effective as a static electricity and static elimination sheet for vehicles.

The present invention reduces the potential of a charged body such as a human body charged to a high potential in a vehicle to a level below a potential for spark discharge before contact in a process of contacting the sheet with a conductive body after contact. Further, the present invention provides a vehicle interior sheet having a function of rapidly removing charge from a charged body, especially a surface material sheet for automobile seats, and provides a suede-like sheet having self-system electrification.

Further, the present invention has a sufficient antistatic property and a neutralizing property required as an interior seat for a vehicle, yet has sufficient flexibility and a high-class feeling required for a surface material of a vehicle seat, and a more elegant lighting. It is intended to provide a sheet having an effective appearance.

<Means for Solving the Problems> The present invention is a substrate composed of ultrafine fibers and / or bundle fibers thereof and an elastic resin, and one surface of the substrate is made of ultrafine fibers having an average fineness of 0.3 denier or less and a nap density of 10 ⁴ fibers / in suede sheet surface mainly comprising cm ² or more fiber napped, presence piloerection of conductive fibers resistance that communicates with the at least one base per ten ⁴ nap is 10 ⁵ ~10 ⁹ Ω / cm The surface electrical resistance of the suede-like sheet is 10 ⁶
A suede-like sheet provided with a flexible semiconductor layer of up to 10 ¹⁰ Ω.

Further, the present invention has an electric resistance of 10 ⁵ to 10 ⁹ with ultrafine fibers having an average fineness of 0.3 denier or less and / or ultrafine fiber generating fibers.
Ω ultrafine fibers or ultrafine fiber generating fibers raised fibers 10 ⁴
A fiber-entangled non-woven fabric is made by mixing fibers in an amount of at least one per one, and (1) after containing an elastic resin, the ultrafine fiber-generating fibers are treated to form ultrafine fibers or ultrafine fiber bundles, (2) An ultrafine fiber or an ultrafine fiber bundle is processed into an ultrafine fiber or an ultrafine fiber bundle, and then an elastic resin is added to form a substrate, and one surface of the substrate is provided with a fiber nap density on the surface. Is raised to 10 ⁴ fibers / cm ² or more to give a suede-like sheet with a surface mainly made of fiber nap, and then the back surface of the suede-like sheet has a surface electric resistance
A method for producing a suede-like sheet, which comprises adding a flexible polymer composition of 10 ⁶ to 10 ¹⁰ Ω.

The ultrafine fiber-generating fiber used in the present invention is a multicomponent fiber that can be divided into a plurality of pieces, a sea-island fiber that can extract and remove sea components, and is ultrafine before or after containing an elastic resin. is there. Among them, as a suede-like sheet, ultrafine fibers having a fineness of 0.3 denier or less, preferably 0.1 denier or less are used in order to obtain an elegant appearance and a soft touch.

As the conductive fiber used in the present invention, carbon, a fiber made of a polymer mixed with conductive powder particles such as metal,
Examples of the composite fiber include a polymer containing these conductive powder particles and a polymer containing substantially no conductive powder particles. Although thin metal wires and the like are also used as conductive fibers, these fibers generally have an electric resistance of less than 10 ⁵ Ω / cm, which will be described later.
In terms of electrical resistance, these conductive fibers cannot generally be used in the present invention. In the present invention, in particular, in order not to impair the aesthetic appearance and texture of the fiber material, and for the purposes of the present invention, the polymer containing conductive powder particles such as carbon is substantially free of conductive powder particles. Composite fibers such as those surrounded by a polymer layer are useful.

Further, as the conductive fiber, those having an electric resistance of 10 ⁹ Ω / cm or less are preferable in terms of the static elimination effect due to current collection, but if it is less than 10 ⁵ Ω / cm, shock due to electric shock will occur,
In the present invention, those having a range of 10 ⁹ to 10 ⁵ Ω / cm are used.
Even in the case of a fiber made of a polymer mixed with carbon or metal conductive powder particles or a composite fiber containing the polymer as described above, the electric resistance value greatly changes depending on the addition amount of the conductive powder particles. Therefore, it is necessary that the conductive powder particles are added so that the electric resistance value falls within the above range.

A method of cutting the ultrafine fiber-generating fiber and the conductive fiber into a required constant length and then blending them together, or bundling each fiber bundle at a required ratio before cutting, stretching, crimping if necessary, Both fibers are uniformly mixed by a cutting method, and a three-dimensional entangled nonwoven fabric is obtained by an existing method.

Polyurethane is preferably used as the elastic body to be contained in this nonwoven fabric, and at least one polymer diol selected from polyester diol having an average molecular weight of 700 to 3000, polyether diol, polyester ether diol, polylactone diol, polycarbonate diol, and the like, An organic diisocyanate mainly composed of at least one organic diisocyanate selected from aromatic diisocyanates and / or alicyclic diisocyanates, and optionally other organic diisocyanates or organic triisocyanates, and low molecular diols and low molecular diamines Polyester polyurethane obtained by polymerizing a compound having two active hydrogen atoms such as hydrazine, hydroxyamine and hydroxyamine by a solution polymerization method, a melt polymerization method, a bulk polymerization method, etc. Examples of the polyurethane include polyurethane, polyester polyether polyurethane, polylactone polyurethane, and polycarbonate polyurethane, and the polyurethane has a solution viscosity at 30 ° C. [η] of 0.5 to 1.3. Except for this solution viscosity, it is not preferable for constructing a suede-like sheet of cow leather or sheep leather, which is the object of the present invention.

In this way, the memory of the base material containing the elastic resin in the ultrafine fiber nonwoven fabric is buffed to form naps, but in order to obtain a graceful appearance with a lighting effect as a suede-like sheet and a soft touch, first In addition to the fineness of the ultrafine fibers mentioned above, the nap density also has a great influence, and is 10 ⁴ fibers / cm ² or more, preferably 10 ⁵ fibers / cm ² or more.

Further, in order to impart sufficient antistatic and static elimination performance to this sheet, the conductive fibers having an electric resistance of 10 ⁵ to 10 ⁹ Ω / cm described above are formed from the semiconductor layer on the back surface to the substrate with a certain density. It is necessary to communicate with each other so that napped hair is present on the surface.
The napped fibers have a function of lowering the electric potential of the charged body to some extent by corona discharge by collecting current on the sheet immediately before contact when the charged body charged at high potential approaches. The napped density of the conductive fibers communicating with the substrate necessary for the antistatic sheet in the present invention is at least one per 10 ⁴ fibers / cm ^{2 of the} ultrafine fibers. Below that, sufficient current collection and discharge effects cannot be obtained. However, on the contrary, if the density of the conductive fibers having a thickness 10 times or more that of the ultrafine fibers becomes too high, the same effect will be saturated and not only a remarkable improvement of the effect will not be observed, but also the touch feeling will become rough and the napped hair with a significantly different coloring property This is not desirable because it gives a shimofuri appearance.

The semiconductor layer according to the present invention is formed by coating the back surface of the fabric layer as a backing agent or laminating it as a film or the like. As the backing agent, an ordinary backing resin or rubber in which electrically conductive powder particles or substances such as carbon or metal are finely dispersed is used, and as the film, an electrically conductive fine particle or the like is similarly mixed. To be

The semiconductor layer needs to have a surface resistance of 10 ⁶ to 10 ¹⁰ Ω, and if it is 10 ¹⁰ Ω or more, it is difficult to remove the charge by contact with a charged body, and if it is 10 ⁶ Ω or less, the layer becomes a conductor. It becomes close, and depending on the potential of the charged body, spark discharge may occur between the sheet and the sheet, which is not preferable. The backing agent can be easily obtained by, for example, finely dispersing carbon powder particles in an ordinary backing resin by generally mixing it in an amount of 1.5 to 15% by weight of the resin agent (solid content). Also in the case of film,
It is easily obtained by adjusting the amount of conductive powder particles or substances mixed.

Generally, when conductive powder particles are added to the resin, the flexibility of the resin layer obtained from this resin mixture is halved, and when it is used as a seat surface material, the flexibility of the seat is impaired and the sitting comfort deteriorates. In order to prevent such a case, it is effective to form the resin layer by a foam coating method or a mesh coating method (including dot-shaped, linear-shaped, and mesh-shaped coating).

In the present invention, it is necessary that the conductive fiber and the semiconductor layer are in contact, and if they are not in contact, the corona discharge ability of the static electricity collected in the fabric layer is reduced and at the same time the semiconductor layer is leaked. The effect will also decrease. Further, it is preferable that the electric resistance value of the conductive fiber is lower than the surface resistance value of the semiconductor layer from the viewpoint of the effect of leaking to the semiconductor layer.

Further, in the present invention, it is preferable to remove the static electricity of the sheet collected from the charged body by grounding, and for this reason, the surface resistance 10 ⁶ is applied to the back surface of the sheet composed of the cloth layer and the semiconductor layer.
It is desirable to integrate a conductive layer of Ω or less.

As the conductive layer, a conductive film, a conductive cloth, a metal sheet, a metal plate or the like is used. FIG. 1 is a sectional view of a composite sheet having antistatic and static elimination functions according to the present invention,
In the figure, 1 is an ultrafine fiber, 2 is a conductive fiber, 3 is a base layer, 4
Represents a semiconductor layer, and 5 represents a conductive layer.

<Operation> The composite sheet of the present invention is used by being grounded to the conductive layer. When a charged body such as a human body charged at a high potential is about to come into contact with the surface of the sheet, first, the charged body is charged immediately before the contact. The static electricity is collected by the conductive fibers of the fiber layer and the potential of the charged body is lowered by corona discharge, and the sheet of the present invention is not a conductor as a whole and gradually discharges static electricity and does not discharge at once. When the body comes into contact with the sheet surface, the static electricity of the charged body flows more slowly than the conductor into the semiconductor layer through the conductive fibers of the sheet, and is discharged by the ground. Therefore, when the high-potential charged body comes into contact with the sheet of the present invention, the charged body can be quickly destaticized without causing electrostatic damage such as electric shock and noise due to spark discharge. When the potential of the charged body is low, the charge is removed only by contact with the sheet.

The sheet itself according to the present invention has an antistatic effect because the conductive fibers are mixed therein, and the static elimination function does not significantly charge the substance in contact with the sheet according to the present invention.

From the functions described above, the seat of the present invention can be used as an interior material for a vehicle, for example, as a seat surface material, a door lining, an inside panel plate, and the like, and is particularly excellent as a surface material for a vehicle seat. In addition to these, it can be used as upholstery for computer rooms, door knob covers, rugs, wall materials, and the like.

<Examples> Next, embodiments of the present invention will be described with reference to specific examples.
Parts and% in the examples relate to weight unless otherwise specified.

Example 1 190 parts of multi-component fiber (A) having a thickness of 5 denier and 50 parts of polyethylene terephthalate as an island component and 50 parts of low density polyethylene as a sea component and acetylene black 26.5
% Of 6-nylon is surrounded by polyethylene terephthalate not containing acetylene black. A three-dimensional entangled non-woven fabric made by mixing 5 parts of 12.5 denier composite conductive fibers (B) having a cross-sectional structure with polytetrafluoroethylene After impregnating a DMF solution of a polyurethane composition having 60 parts of methylene ether glycol and 40 parts of polycaprolactone as a soft segment and performing wet coagulation, the sea component (polyethylene) of the fiber (A) was extracted and removed in hot toluene, A fiber sheet was obtained.

The surface of this fiber sheet is buffed to form naps of ultrafine fibers, which are dyed with a high-temperature high-pressure jet dyeing machine at 120 ° C and then brushed to obtain a suede-like sheet with a graceful appearance that has a lighting effect. It was The ultrafine fibers had an average nap density of 10 ⁵ fibers / cm ² , and the conductive fibers (B) communicating with the substrate had an average nap density of 25 fibers / cm ² .

A backing material containing 10% of carbon powder was laid down on the back surface of the napped sheet to form a semiconductor layer, and a suede-like fiber sheet (I) was obtained.

For comparison, a sample (II) without the semiconductor backing of the sheet (I), and a conductor backing with a surface resistance of 10 ⁴ Ω (in which 30% of carbon powder is mixed in the backing resin) instead of the semiconductor backing of the sheet of (I) (3) was prepared and the static elimination performance of these samples was evaluated. The results are shown in Table 1.

Each of the samples (I) to (III) was used as a surface material to fabricate an automobile seat. The seat is then set in a car, and a person wearing a polyester shirt and polyester trousers is seated on the seat under the temperature and humidity conditions of 5 ° C-12% RH, and the hips are moved back and forth 10 times in 10 seconds. I rubbed my seat against my clothes.

In the case of sample (II), a large electric shock occurred when standing up from the seat and touching a conductive object (metal). Also, in the case of sample (III), a large electric shock occurred when getting up from the seat. On the other hand, in the case of the sample (I), only a slight electric shock was felt when the conductive object was touched.

Example 2 A sample (I) except that the semiconductor layer was prepared by applying a resin solution (containing 10% by weight of carbon powder) to the back surface and drying the resin solution in the manufacturing method of the sample (I) in Example 1. A sheet was produced in the same manner as in (1). At this time, the bubble content of the semiconductor layer was 65% by volume. The coating amount of the semiconductor layer was 95 g / m ² . When a seat using this sheet as a surface material was manufactured, it was extremely excellent in terms of antistatic and static elimination properties as in the case of the sample (I), and the sheet itself was also extremely flexible, and was used as the surface material of the seat. The comfort of sitting was extremely good.

<Effect> In the suede-like sheet of the present invention, the potential of the charged body can be lowered to a potential at which spark discharge does not occur immediately before contact with the sheet, and then the charge can be quickly removed from the charged body.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an example of a composite sheet using the suede-like sheet of the present invention, and FIG. 2 is a diagram of an apparatus for measuring the static elimination performance of the sheet.

Claims (1)

[Claims] 1. A substrate comprising ultrafine fibers and / or bundled fibers thereof and an elastic resin, and a fiber nap having a nap density of 10 ⁴ fibers / cm ² or more made of ultrafine fibers having an average fineness of 0.3 denier or less on one surface of the substrate. In a suede-like sheet having a main surface, a nap of conductive fibers having an electric resistance of 10 ⁵ to 10 ⁹ Ω / cm communicating with at least one substrate per 10 ⁴ naps is present, and the suede-like sheet On the back side, surface electric resistance
A suede-like sheet provided with a flexible semiconductor layer of 10 ⁶ to 10 ¹⁰ Ω.