JPH01696A - Composite sheet with anti-static and static-eliminating functions - 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 fiber fabric sheet having antistatic and MjLm functions, particularly to a sheet used as a surface material for automobile seats.

<Prior Art> It is well known that a shock due to static electricity occurs when getting out of a car after driving it.

This is because when the human body rubs against the interior materials (for example, seats) inside the vehicle, the body becomes charged with a high potential, and when this touches a conductor, a large amount of static electricity suddenly flows in an instant. , that is, a spark discharge phenomenon.

BACKGROUND ART Conventionally, a method of weaving conductive fibers into textile products has been known as a measure to prevent static electricity. This thing is #sen! It utilizes a mechanism that collects the static electricity charged on the product to conductive fibers and discharges it from the tips of the fibers by corona discharge to eliminate the static electricity on the fiber products. However, even if such measures are used, the corona discharge effect (current collection effect) of textile products
However, the electrical storage effect (capacitor effect) of the conductive Pa fiber itself is extremely small, and it is unlikely that it will be able to be used as a surface material for car seats. ) It is almost impossible to expect that this static electricity will be removed by escaping it to the sheet.

For this reason, for the purpose of eliminating static electricity, a conductive packing agent containing carbon fine particles of 20 inches to 5 degrees on the back side of a fiber sheet mixed with conductive fibers/! ! (Surface resistance 10
0 or less) and grounding the backing agent layer has been proposed as a static eliminating sheet (Utility Model Application No. 60-4).
No. 0497). However, for example, when the sheet is used as a surface material for a car seat, if the sheet and the human body are in contact from the beginning, static electricity charged on the sheet and the human body will always pass through the conductive fibers and the backing material layer to the car body. However, when the human body leaves the seat, the static electricity elimination route for static electricity on the human body side caused by peeling or friction between the seat and the human body (clothing) is cut off. As a result, the human body is charged to a high potential, and when the seat and the human body come into contact again, it is observed that a significant spark discharge occurs. A similar phenomenon occurs when a human body charged to a high potential due to other causes comes into contact with the same sheet. This phenomenon is the same as G spark discharge when a highly charged human body comes into contact with a good conductor such as metal. Therefore, the sheet cannot necessarily be said to be effective as an anti-static and static-eliminating sheet for an axle.

<Problem to be solved by the invention> The non-invention is that in the process in which an 'IF electric object such as a human body charged with a high electric potential in a vehicle comes into contact with the sheet, the electric potential of the charged object is sparked before contact. An interior sheet for a vehicle that has the function of lowering the electric potential below the discharge potential and quickly eliminating static electricity from a charged body through conduction after contact, especially a sheet for the surface material of a car seat, and the sheet itself has antistatic properties. The present invention provides a fiber composite sheet having the following properties.

Furthermore, the present invention provides a sheet that has the antistatic and static neutralizing properties required for a vehicle interior sheet, and also has sufficient flexibility required as a surface material for a vehicle seat. Furthermore, the present invention provides an anti-static and static-eliminating sheet that can be used for purposes other than vehicles.

Means for Solving the Problems> The present invention provides a fabric layer in which a semiconductor layer having a surface resistance of 106 to 1010 Ω is provided on the back side of a fabric layer in which conductive fibers having an electrical resistance of 105 to 106 Ω/cfR are arranged at 30W corners or less. 4) A composite sheet having anti-static and static-eliminating functions characterized in that the conductive fibers are integrated with the semiconductor layer, and preferably a conductor layer is integrated on the back surface of the semiconductor layer. This is a composite sheet for vehicles.

First, the fibrous layer in the present invention is made of fabric mainly made of 11 ordinary synthetic fibers, knitted, woven or non-woven,
Conductive fibers are mixed into at least a portion of the constituent fibers such as warp yarns, weft yarns, or pile yarns, or conductive fiber yarns are mixed and woven.

The conductive fiber used in the present invention is fA I, which is made of a polymer mixed with conductive powder particles of carbon, metal, etc.
! , a composite fiber made of a polymer mixed with these conductive powder particles and a polymer substantially free of conductive powder particles. Chemical fibers whose surface is plated with metal, and those with metal deposited inside the fibers.

Fine metal wires can also be used as conductive fibers, but these fibers generally have an electrical resistance of less than 10Ω/υ, which will be described later, and in terms of electrical resistance, these conductive fibers cannot generally be used in the present invention. NaV. In particular, in order not to impair the appearance aesthetics and texture of the fiber material, and for the purpose of the present invention, poly 7- containing conductive powder particles such as carbon is Composite fibers are useful, such as those surrounded by a polymer layer that is substantially free of. Note that the conductive fibers are preferably used in the form of filaments. Furthermore, conductive fibers should not be used alone.

It is more useful to mix or twist the fibers with other fibers so as not to impair the appearance and texture of the fiber material.

In addition, as the conductive fiber, one with an electrical resistance of 109Ω/100 or less is preferable from the viewpoint of static elimination effect by current collection, but 10Ω/100Ω or less is preferred.
If it is less than /3, an electric shock will occur, so in the present invention, one in the range of 10 9 to 10 6 Ω/Ω is used. Note that even in the case of a fiber made of a polymer mixed with conductive powder such as carbon or metal as described above, or a composite fiber containing the polymer, the electrical resistance value changes greatly depending on the amount of conductive powder added. Therefore, it is necessary that conductive powder particles be added so that the electrical resistance value falls within the above range.

It is not necessary to use the above-mentioned conductive fibers mixed or twisted with other fibers as the entire fiber material;
．． 05~s, o It is sufficient if the amount of Ti is conductive fiber. If the weight of the conductive fiber is less than 0.05, no optical current collection or corona discharge effect can be obtained, and if the weight is more than 5, the effect becomes saturated and no significant improvement in effect is observed.

In the invention, it is important that the conductive fibers are arranged so as to form conductive protrusions with a certain density or more on the surface of the semiconductor layer, and for this purpose, It must be arranged on the fabric at intervals of 30 am or less as warp yarn, weft yarn, ground yarn, pile yarn, etc., and specifically, it must be woven or knitted, for example. . The conductive protrusion has the function of lowering the potential of the charged body to some extent by corona discharge by collecting current on the sheet immediately before contact with a charged body charged at a high potential when it approaches.

It may be arranged in a thin soft shape relative to the surface, or it may be arranged upright relative to the surface. The latter is particularly effective, so pile fabric is preferable as a fabric.
Preferably, conductive fibers are arranged in both the base yarn and the pile yarn. In order to have such a function, it is effective that the diameter of the conductive fiber is 50 μm or less.0 Also, the semiconductor layer referred to in the present invention may be coated on the back side of the fabric layer as a backing agent, or coated with a film, etc. It is formed by pasting it together as a. The backing agent used is a regular backing resin or rubber in which conductive particles or substances such as carbon or metal are finely dispersed, and the film is similarly mixed with conductive fine particles. It will be done.

The semiconductor layer needs to have a surface resistance of 106 to 1010 Ω, and if it is more than 10 Ω, the static electricity will be removed by contact with the charged body, and if it is less than 10 Ω, the core layer will be close to a conductor. ), depending on the potential of the charged body, spark discharge may occur between the charged body and the sheet, which is undesirable. The backing agent can be easily obtained, for example, by finely dispersing carbon powder in a conventional backing resin, generally in an amount of 1.5 to 5 times the weight (solid content) of the resin agent, by adding tS. Similarly, in the case of a film, it can be easily obtained by adjusting the amount of conductive particles or substances mixed.

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

In the present invention, it is necessary that the conductive fibers and the semiconductor layer are in contact with each other. If they are not in contact with each other, the corona discharge ability of the static electricity collected in the fabric layer is reduced, and at the same time, the conductive fibers and the semiconductor layer are in contact with each other. The leakage effect will also be reduced. In addition, it is preferable that the electrical resistance value of the conductive fiber is lower than the surface resistance value of the semiconductive layer from the viewpoint of the leakage effect to the semiconductor layer.

Furthermore, in the present invention, it is preferable to remove static electricity from the sheet that collects current from the charged body by grounding, and for this purpose, a surface resistance of 10
It is desirable to integrate a conductive layer with a resistance of 6Ω or less.

As this conductive layer, a conductive film, a conductive fabric, a metal sheet, a metal plate, etc. are used. Figures 1 and 2 are cross-sectional views of a composite sheet having anti-static and static-eliminating functions according to the present invention. FIG. In the figure, 1 is a general yarn, 2 is a pile yarn or ground yarn made by mixing or intertwisting conductive fibers with a diameter of 50 μm or less, 3 is a fabric layer, 4 is a semiconductor layer, and 5 is a conductive layer.

<Function> The composite sheet of the present invention is used by being placed on a grounded conductor in the one shown in Fig. 1, and by being grounded on a conductive layer in the one shown in Fig. 2. When a charged object, such as a human body, is about to come into contact, the static electricity of the charged object is collected by the conductive fibers of the fiber layer immediately before contact, and the potential of the charged object is lowered by corona discharge. The sheet of the invention as a whole is not a conductor, and as it gradually discharges static electricity and does not discharge all at once, when a charged object and the sheet surface come into contact without sparking, the static electricity of the charged object is gradually released from the sheet compared to a conductor. It flows through the conductive fibers to the semiconductor layer and is neutralized by grounding.

Therefore, when a charged body with a high potential comes into contact with the sheet of the present invention, the charge of the charged body can be quickly removed without causing electrostatic disturbances such as electric shock or noise due to spark discharge. Further, 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 it contains conductive fibers, and furthermore, due to the static eliminating function, substances in contact with the sheet according to the present invention are not significantly charged.

Due to the above functions, the sheet of the present invention can be used as an interior material for a vehicle, such as a seat surface material, a door lining, an inside panel board, etc., and is particularly excellent as a surface material for an automobile seat. Furthermore, in addition to these, it can also be used as upholstery for computer rooms, doorknob covers, rugs, wall materials, etc.

Example 1 To confirm the effects of the present invention, the following samples were prototyped and evaluated. The inside of the sample had a cross-sectional structure of a polyester moquette surrounded by a polyester polymer containing 26.5 wt% acetylene black and no nylon polymer.
2 μm) composite conductive fiber filament (electrical resistance 10
7Ω/3) composite yarn twisted at pile yarn intervals of 2tM.
The conductive fibers are arranged at a ratio of one fiber per 2σ interval on the ground warp yarn, and the ratio of the conductive fibers to the weight of the fiber material is 0.09 times), and on the back side there is a semiconductor layer with a surface resistance of 4.4XIOΩ ( The fabric layer of sample (2) was coated with a backing resin containing 1.7% by weight of carbon powder (the conductive fibers and the backing layer were in contact with each other). Sample C) is a fabric layer that does not contain conductive fibers and is normally backed with a fabric layer that does not contain conductive fibers. (The conductive fibers and the backing layer are in contact with each other.) The static elimination performance of these was evaluated. The results are shown in Table 1.

The evaluation method is to place the evaluation sample (2) (20afIX203) on the earth plate (b) as shown in Fig.
This is done by measuring the electric potential of the discharge bulb when the tip of the ink comes into contact with the surface of the sample. However, the temperature and humidity conditions are 22
℃×20%RH. In Figure 3, 15 is an insulator, 16
17 is an electrometer, 17 is a recorder, 18 is an electrode, 19 is a probe, and 20 is an insulator.

Automobile seats were manufactured using these samples A and D as surface materials. Then, the manufactured seat was set in a car, and a person wearing a polyester shirt and polyester pants was seated in the seat at a temperature of 0°C.
The participants moved their hips backwards, forwards, left and right 10 times in 10 seconds to create friction between the seat and their clothes.

Then, the human body potential when standing up from the seat was measured0 Sample A...3.4kv Sample B...
...Q, 5kv sample C...-9,Qkv
Sample D...3.3kv Samples B and C
In both cases, stand up from your seat and touch a conductive object (metal).
When touched, a large electrical shock occurred. In addition, in the case of sample D, a large electric shock occurred when the passenger stood up from the seat. In contrast, in the case of sample A, only a slight electric shock was felt when touching the conductive object.

Comparative Example Conductive fibers were made of fine stainless steel (with a resistance of 10 Ω/cm).
A composite sheet was produced in the same manner as Sample A except that 15μ) was used. When this sheet was used as a surface material for a car seat, it was found that a large electric shock was generated when it came into contact with the conductive layer due to the capacitor effect.

On the other hand, in the conductive fiber used in sample A as the conductive fiber, the amount of acetylene black added was 20 w.
A composite sheath was prepared in the same manner as Sample A using the same material except that t % was changed. The electrical resistance of conductive fiber is 1010Ω15! It is.

The leakage of charged human body potential was extremely slow in this sheet, and as a result, there was almost no static elimination effect.

Example 2 The manufacturing method of Sample A in Example 1 was the same as Sample A except that a pre-foamed resin liquid (containing 2.0% by weight of carbon powder) was applied to the back surface and dried as the semiconductor layer. A sheet was produced in a similar manner. The bubble content of the semiconductor layer at this time was 65 by volume. Further, the thickness of the semiconductor product was 95 f/rl. When we created a seat using this sheet as the surface material, it was found to have excellent anti-static and static-eliminating properties similar to Sample A, and the sheet itself was also extremely flexible, so it was used as the surface material for the seat. The seats were extremely comfortable.

<Effects> According to the present invention, the potential of the charged body is lowered to a potential that does not cause spark discharge immediately before contact with the sheet, and the charge is quickly removed from the charged body.

[Brief explanation of the drawing]

1 and 2 are cross-sectional views of an example of the composite sheet of the present invention, and FIG. 3 is a diagram of an apparatus for measuring the static elimination performance of the sheet. Patent applicant RiRa Shi Co., Ltd.

Claims (1)

[Claims] 1) A fabric layer having a surface resistance of 10^6 to 10^1^0 Ω on the back side of a fabric layer in which conductive fibers having an electrical resistance of 10^5 to 10^9 Ω/cm are arranged at intervals of 30 mm or less. A composite sheet having anti-static and static-eliminating functions, characterized in that a semiconductor layer is integrated, and the conductive fibers and the semiconductor layer are in contact with each other. 2) The composite sheet for vehicles according to claim 1.