JPH05174991A - Static eliminator sheet - Google Patents

Abstract

PURPOSE:To provide a static eliminator sheet excellent in static eliminating performance even under a condition that static electricity is continuously generated. CONSTITUTION:In a static eliminator sheet, slip nonwoven fabric is almost totally coated with electron conjugated system polymer and further to form a conductive layer of conductivity excellent from the electron conjugated system polymer by metal plating treatment, evaporation treatment, spattering treatment, ion plating treatment, metal flame spraying treatment or coating treatment by a paste-state object of silver paste or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an OA device such as a copying machine,
Alternatively, the present invention relates to an antistatic sheet that can be used to remove static electricity generated in the plastic manufacturing industry.

[0002]

2. Description of the Related Art Conventionally, as a method for removing static electricity from OA equipment such as a copying machine, JP-A-63-26999, JP-A-56-50346, and JP-A-60-161373,
Japanese Patent Application No. 1-114145 and Japanese Patent Application No. 2-142085 disclose static eliminators using conductive fibers or conductive non-woven fabrics. However, disclosed in these are non-woven fabrics that are simply mixed with metal fibers or carbon fibers, non-woven fabrics whose surfaces are coated with metal simply by plating, vapor deposition, sputtering, etc., or non-woven fabrics that are simply coated with an electron-conjugated polymer. Since it is a static eliminator consisting of, it is possible to remove static electricity to a certain extent, but if static electricity is continuously generated in OA equipment such as copying machines or in the plastic manufacturing industry, the static elimination performance will gradually decline, and the satisfactory static elimination performance can be obtained. Did not have.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a static elimination sheet having excellent static elimination performance.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a static elimination sheet in which an entangled nonwoven fabric is substantially entirely covered with an electron-conjugated polymer and a conductive layer having a higher conductivity than the electron-conjugated polymer is formed. Is. The static elimination sheet is
If it is adhered and fixed almost entirely by an adhesive, it is a static elimination sheet having excellent abrasion resistance.

[0005]

In the static eliminator sheet of the present invention, the entangled non-woven fabric is almost entirely covered with the electron conjugated polymer, and further, the conductive layer having higher conductivity than the electron conjugated polymer is formed. The static electricity removed by the polymer does not accumulate, and it can be grounded through the conductive layer. Even when used under the condition where static electricity is continuously generated, the static elimination performance does not deteriorate and it can be used for a long time.

Further, since the entangled nonwoven fabric is entangled at random and always has fibers perpendicular to the charged object, it is easy to remove the electric charge by corona discharge. Further, the fiber orientation of the entangled non-woven fabric tends to be in the thickness direction of the non-woven fabric, and since the electron-conjugated polymer also covers the fiber surface inside the entangled non-woven fabric, the electron-conjugated polymer and the conductive layer It comes into contact with and can be efficiently grounded from the conductive layer.

If the static elimination sheet of the present invention is adhered and fixed on the entire surface with an adhesive, the fibers are unlikely to fall off and the sheet is excellent in abrasion resistance.

The static elimination sheet of the present invention will be described in detail below.

The fibers used in the entangled nonwoven fabric of the present invention are not particularly limited, and include, for example, natural fibers such as silk, wool, cotton and hemp, regenerated fibers such as rayon fibers, semi-synthetic fibers such as acetate fibers, Synthetic fibers such as polyamide fibers, polyvinyl alcohol fibers, acrylic fibers, polyester fibers, polyvinylidene chloride fibers, polyvinyl chloride fibers, polyurethane fibers, polyethylene fibers and polypropylene fibers can be used. It should be noted that not only the fibers made of one component such as the above fibers, but also core-sheath type and side-by-side type conjugate fibers made of two or more resin components can be used.

Further, when fibers which can be divided into ultrafine fibers having a fineness of 0.5 denier or less by mechanical and / or chemical treatment are used and the fibers are divided into ultrafine fibers, corona discharge easily occurs, The fiber is preferably used because a sheet having more excellent static elimination property can be obtained.

As the fibers that can be divided into ultrafine fibers having a fineness of 0.5 denier or less, sea-island type fibers having a cross section in which one component is arranged with another component in an island shape, and different components are alternately laminated in layers. Examples thereof include, but are not limited to, a multi-bimetal type fiber having a cross section or a chrysanthemum type fiber having a cross section in which one component is radially arranged in another component.

As the combination of the resin components constituting the above-mentioned dividable fibers, polyamide resin and polyester resin, polyamide resin and polyolefin resin, polyester resin and polyolefin resin, polyester resin and polyacrylonitrile resin are used. Examples include polyamide resin and polyacrylonitrile resin, polyolefin resin and polyacrylonitrile resin, but are not limited thereto.

It is preferable that the amount of such ultrafine fibers is 20% by weight or more.
It is more preferably 50% by weight or more because the static elimination performance is improved.

Further, when highly crimped fibers are used as the fibers constituting the entangled nonwoven fabric, even if the sheet comes into contact with an electrified material and is bent, the crimps of the highly crimped fibers are only stretched, and the fibers themselves. Since it is not stretched, the metal of the conductive layer or the polymer of the electron conjugated system does not peel off,
Static elimination does not decrease.

The highly crimped fiber may be latent or actualized, but the number of crimps is 15 when the crimp is actualized.
~ 100 fibers / inch, more preferably 20
~ 90 fibers / inch.

As the highly crimped fiber, there are two types of resins having different shrinkage ratios, a composite fiber having a spiral crimp, or a fiber having a single component and crimping with a specific heat history. Among these, side-by-side type composite fibers composed of high-melting point polyester and low-melting point polyester have a large number of crimps and exhibit excellent stretchability, and therefore they are preferably used.

In the present invention, the above fibers are entangled to obtain a non-woven fabric. By entanglement, the fiber orientation becomes substantially in the thickness direction of the non-woven fabric, so that the fibers perpendicular to the charged object are always present, corona discharge is likely to occur, and the static elimination property is excellent. In addition, since the orientation direction of the fibers is substantially the thickness direction, the electron-conjugated polymer is more likely to enter the inside, and the fibers inside the entangled nonwoven fabric are also covered, so that the conduction with the conductive layer is more excellent. Specifically, there is a method in which a fiber web obtained by a card method, an air lay method, a wet method, a spun bond method, or the like is entangled with each other by applying a fluid flow such as water or a mechanical external force such as a needle. It can be illustrated, but the invention is not limited thereto.

It is to be noted that, when the above-mentioned divisible fibers capable of obtaining the ultrafine fibers are entangled with each other by a mechanical external force such as a fluid flow or a needle punch, the fibers can be split at the same time. It is a method for forming an entangled nonwoven fabric that does not require

The entangled nonwoven fabric obtained as described above is
The static elimination sheet of the present invention is obtained by forming a conductive layer by coating treatment with an electron conjugated polymer and conductive processing. Either the coating treatment with the electron-conjugated polymer or the conductive treatment may be performed first.

First, the coating treatment with the electron conjugated polymer will be described. When the entangled nonwoven fabric is coated with an electronically conjugated polymer, the entangled nonwoven fabric is porous, and since the fibers are oriented in the substantially thickness direction, the entangled nonwoven fabric is substantially entirely covered with the conjugated polymer, Since conductivity also occurs in the thickness direction, it is excellent in conduction to the conductive layer and is excellent in static elimination.

Further, the coating treatment with the electron-conjugated polymer has good adhesiveness, excellent durability and flexibility, and
For example, even if the fiber is installed on the paper carrying-in side of a photoconductor drum of a copying machine and the peeled fibers adhere to the photoconductor drum, electric current leaks and damages the photoconductor drum due to its relatively low conductivity. No worries.

As a method of forming a conductive layer on the surface of a non-woven fabric with an electron-conjugated polymer, a solution containing an oxidizing agent such as iron (III) chloride and copper (II) chloride is impregnated into the entangled non-woven fabric, and then the monomer is added to the entangled non-woven fabric. A method of polymerizing by contacting can be exemplified, but the method is not limited to this. As for the method of contact with the monomer, when the monomer is in a liquid state, it is sufficient to impregnate, coat or spray the entangled non-woven fabric to which the oxidant is attached, and when the monomer is in a gas state, it is filled with the monomer. The entangled non-woven fabric to which the oxidant is attached may be placed in the container and is not limited.

Examples of the monomer to be polymerized include acetylene, benzene, aniline, phenylacetylene, pyrrole, furan, thiophene, indole and derivatives of these monomers. Among them, pyrrole is excellent in conductivity and polymerizability, and thus can be preferably used.

Conducting processing is performed before or after the coating treatment with the electron conjugated polymer as described above to form a conductive layer having higher conductivity than the electron conjugated polymer. Therefore, the static electricity removed by the electron-conjugated polymer moves to the conductive layer with better conductivity, but since it can be grounded from this conductive layer, it has excellent static elimination property even under the condition that static electricity is generated continuously. Exert.

As the conductive processing method, metal plating treatment, vapor deposition treatment, sputtering treatment, ion plating treatment, metal spraying treatment, coating treatment with a paste-like material such as silver paste, or the like is used, and aluminum, zinc, copper, tin, A method for forming a metal layer of silver, stainless steel or the like can be exemplified, but the method is not limited to these.

The static eliminator sheet of the present invention can be obtained as described above, but if it is entirely adhered and fixed with an adhesive before or after the formation of the conductive layer by the coating treatment with the electron conjugated polymer and / or the conductive processing treatment. A static elimination sheet with excellent abrasion resistance.

The adhesive may be solid, may be water-dispersed, or may be solution-based, and is not particularly limited, but among these, water-dispersed adhesives may be used. The mold-type adhesive penetrates into the entangled nonwoven fabric, and is easily adhered and fixed inside the entangled nonwoven fabric, which is relatively safe in manufacturing, and thus can be preferably used.

As the water-dispersible adhesive, thermoplastic synthetic resins such as polyacrylic acid ester, polyvinyl acetate, polyvinyl chloride, polyvinylidene chloride, acrylic, polystyrene, polyolefin, and their copolymers, natural Examples thereof include rubbers, natural synthetic rubbers, nitrile rubbers, styrene / butadiene rubbers, chloroprene rubbers, butyl rubbers and other rubbers, and thermosetting resins such as urea-formalin resins, melamine-formalin resins and phenol resins, but are not limited thereto. Not a thing.

When the electron-conjugated monomer is polymerized after fixing with an adhesive, these adhesives are mixed with an oxidizing agent such as iron (III) chloride or copper (II) chloride to prepare an adhesive. If the oxidant is attached to the entangled nonwoven fabric at the same time as the adhesive fixing, the oxidant need not be attached to the entangled nonwoven fabric again.

This adhesive is a dry weight of entangled non-woven fabric 15
If it is less than%, the fibers of the entangled nonwoven fabric are likely to fall off, and if it is more than 45%, the adhesive will make the surface of the entangled nonwoven fabric smooth and adversely affect corona discharge. The agent is preferably used in the range of 15 to 45%, more preferably 20 to 40%.

Further, if these adhesives are adhered and fixed only on one side or partially of the entangled nonwoven fabric, the fibers in the non-adhesively fixed part may fall off, so that the entangled nonwoven fabric is almost entirely covered. And fix it with adhesive. The adhesive is not particularly limited as long as it is adhered and fixed by impregnating the entangled nonwoven fabric, applying it, or spraying.

The static elimination sheet obtained as described above is
For example, in order to remove static electricity that is continuously generated in OA equipment such as a copying machine or in the plastic manufacturing industry, it is cut appropriately and used in a state of being in contact with or non-contact with a charged object. In the case of contact, it is more preferable that only a part is in contact and the non-contact part is left to facilitate corona discharge.

When a conductive layer is formed on one surface of the static eliminator sheet, the conductive layer is installed so that the metal of the conductive layer does not come off due to friction so that the conductive layer does not come into contact with the charged material.

Examples of the present invention will be described below, but the invention is not limited to the following examples. Examples,
The surface resistance in the comparative example is Loresta AP MCP-T400.
It is a value measured by Mitsubishi Petrochemical Co., Ltd.

[0035]

【Example】

(Example 1) 100% of chrysanthemum-shaped fibers having a polyester component as a main component, a polyester component joined by a polyamide component, a fineness of 2 denier, a fiber length of 38 mm, and being capable of being divided into 0.1 denier, were carded. The resulting fiber web was entangled with a water flow having a water pressure of 50 to 95 kg / cm ² to obtain an entangled nonwoven fabric.

This entangled non-woven fabric was mixed with iron chloride (II
After impregnating I), the pyrrole solution was brought into contact with the evaporated pyrrole monomer gas to obtain an entangled nonwoven fabric substantially entirely covered with polypyrrole. Then, aluminum having a thickness of 100 nm was vapor-deposited on one surface to obtain a static elimination sheet of the present invention. The surface resistance of only the coating with pyrrole was 130 Ω / lot, and the surface resistance of the aluminum surface was 80 Ω / lot.

Example 2 The entangled nonwoven fabric obtained in the same manner as in Example 1 was impregnated with a water-dispersible acrylic adhesive (solid content 20%, viscosity 300 cps) in a dry weight of 20%,
After drying at a temperature of 150 ° C. for 5 minutes, an entangled non-woven fabric having a basis weight of 100 g / m ² and a thickness of 0.5 mm was adhered and fixed on the entire surface. Then, in the same manner as in Example 1, a coating treatment with polypyrrole was performed, and then a vapor deposition treatment with aluminum was performed to obtain a static elimination sheet of the present invention. The surface resistance of the coating only with polypyrrole was 130 Ω / lot, and the surface resistance of the aluminum surface was 80 Ω / lot.

(Example 3) One side of the entangled nonwoven fabric obtained in the same manner as in Example 1 was sputtered to a thickness of 3
After forming a conductive layer made of 0 nm stainless steel, the whole surface was bonded and fixed with an adhesive as in Example 2. Then, it carried out similarly to Example 1, and coat | covered it with the polypyrrole, and obtained the static elimination sheet. The surface resistance of the surface on which the conductive layer was formed by the sputtering treatment was 80 Ω / lot, and the surface resistance only when coated with polypyrrole was 130 Ω / lot.

(Comparative Example) In the same manner as in Example 2, the entangled non-woven fabric, which was adhesively fixed on the entire surface, was coated with polypyrrole to obtain a static elimination sheet. The surface resistance of this entangled nonwoven fabric was 130Ω / B.

(Static elimination effect test) A high voltage was applied to the polyester film to electrify it with static electricity of 8.0 KV, and the static elimination of Examples 1 to 3 and Comparative Example in which 2 × 30 cm was cut on the electrified polyester film. The surface made of polypyrrole of the sheet was brought into contact with the surface for 5 mm, and the conductive layer on the other surface was grounded.
Then, the residual electrostatic voltage is measured while the charged polyester film is moving at a speed of 55 m / min. In addition, this static voltage measurement is performed by an electrostatic measuring device (manufactured by Nippon Static Co., Ltd., SV-
7 type). Also, this measurement is at a temperature of 25 ° C,
It is performed under the condition of a humidity of 40%. The results are shown in Table 1.

[0041]

[Table 1]

(Abrasion resistance test) A load of 20 g / cm ^{2 was} applied to the static elimination sheets of Examples 2 to 3 by the C method (appearance and retention tester) according to JIS standard L1076.
After rubbing 50 times with, the surface condition was visually evaluated. As a result, all the static elimination sheets of Examples 2 and 3 were of N-class and were excellent in abrasion resistance. The evaluation shows that the abrasion resistance is excellent in the order of H <M <L <N.

[0043]

EFFECTS OF THE INVENTION Since the static elimination sheet of the present invention can ground the static electricity removed by the electron conjugated polymer through the conductive layer, the static elimination performance does not deteriorate even when used under the condition where static electricity is continuously generated. It can be used for a long time.

Since the entangled nonwoven fabric used in the static elimination sheet of the present invention always has fibers perpendicular to the charged substance, it is easy to eliminate the static electricity by corona discharge. In addition, since the electron-conjugated polymer and the conductive layer are likely to come into contact with each other inside the entangled nonwoven fabric, the conductive layer can be efficiently grounded.

When the static eliminator sheet of the present invention is adhered and fixed on the entire surface with an adhesive, fibers are less likely to fall off and the sheet is excellent in abrasion resistance.

Claims (2)

[Claims] 1. A static eliminator sheet characterized in that the entangled nonwoven fabric is substantially entirely covered with an electron-conjugated polymer, and further forms a conductive layer having higher conductivity than the electron-conjugated polymer. .. 2. A static eliminator sheet, wherein the static eliminator sheet according to claim 1 is adhered and fixed substantially entirely by an adhesive.