JP2002010900A - Antistatic carpet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antistatic carpet causing no irregular touch on a pile face or no reduction in the antistatic effect due to a crack in a conductive lining coating film even in cold winter by using a conductive fiber yarn. SOLUTION: All the piles 13 of a carpet finished by applying an adhesive 16 to all over a backstitch face of a pile cloth are constructed of a piled yarn principally consisting of a thermoplastic synthetic fiber mixed with a conductive fiber 11 of less than 1 wt.%. As the conductive fiber 11, a thermoplastic synthetic fiber having a cyano group and with introduced copper sulfate is used. The adhesive 16 principally consisting of a carboxylated denatured styrene- butadiene-rubber latex having a glass transition temperature ranging from -20 deg.C to -45 deg.C is prepared by mixing 100 pts.wt. a carobxylated denatured styrene-butadiene-rubber latex in termo of solid content with 20-60 pts.wt. of an antistatic agent and <=60 pts.wt. of solid fine powder. As the antistatic agent, fibrous carbon black with a specific surface area of 500 g/m2 or more, a length of 0.5-3.0 mm, and a diameter of 20 μm or less is used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antistatic carpet whose pile surface is unlikely to carry static electricity.

[0002]

2. Description of the Related Art As a method for obtaining an antistatic carpet, a conductive yarn such as a carbon fiber, a metal fiber, or a synthetic fiber having a cyano group into which copper sulfide is introduced as a pile yarn or a base fabric can be used. It is known that a conductive adhesive such as a metal powder or a carbon black is mixed with a conductive powder such as carbon black or a hygroscopic surfactant.

[0003]

The conductive yarn is extremely expensive as compared with a normal non-conductive fiber yarn. Further, by arranging the conductive yarn every few warps or wefts, the antistatic fabric can be used. For this reason, in the conventional antistatic carpet, a conductive yarn is mixed in some pile yarns which are every few yarns. However, conductive yarn is nylon, polyester fiber,
Compared with general fibers such as acrylic fiber, the properties such as moisture absorption, flexibility, and dyeing properties, appearance (color), and texture are significantly different. Mix them with some pile yarns. Even if a required antistatic effect is obtained by this, the conductive yarn used for a part thereof gives a sense of incongruity and impairs the appearance and tactile feel of the pile surface.

In a double raschel warp knitted carpet, a ground warp yarn forming a needle loop integrally with a back stitch of a pile yarn constitutes a base cloth. The base fabric is softer than the woven base fabric of Wilton carpet or Akisminster carpet, which is heavily woven by placing warp and core warp yarns, and dimensionally stable. Because of lack of properties and shape stability,
A backing finish is required with an adhesive containing a large amount of an inorganic filler which is a solid fine powder. However, when a conductive powder or a hygroscopic surfactant is further added to the adhesive containing a large amount of the inorganic filler, the backing film is easily cracked, and the antistatic effect of the conductive adhesive is reduced. Decreases over time.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a control system which does not cause a feeling of incongruity on a pile surface due to the use of conductive fiber yarns and does not reduce the antistatic effect due to cracks in a conductive backing film even in cold winter. The purpose is to obtain an electrically conductive carpet.

[0006]

The carpet according to the present invention is a double raschel warp knitted carpet finished by applying an adhesive 16 over the entire back stitch surface of a double raschel warp knitted pile fabric. 13 is made of a pile yarn containing thermoplastic synthetic fibers as a main material and conductive fibers 11 of less than 1% by weight mixed with each other, and the conductive fibers 11 have a cyano group into which copper sulfide is introduced. A fiber, and the adhesive 16 has a glass transition temperature of −20 ° C. to −45 ° C.
Main component is butadiene rubber latex and its solid content is 1
It is prepared by mixing 20 to 60 parts by weight of an antistatic agent and 60 parts by weight or less of a solid fine powder with respect to 00 parts by weight, and the antistatic agent has a specific surface area of 500 g / m ² or more and a long length. The first feature is that the carbon black is 0.5 to 3.0 mm in diameter and 20 μm or less in diameter.

[0007] A second feature of the carpet according to the present invention is that
In addition to the first feature, the conductive fiber 11 is a conductive acrylic fiber into which copper sulfide is introduced.

The carpet according to the present invention is a tufted carpet finished by applying an adhesive 16 to the entire back stitch surface of a tufted pile fabric, and all piles 13 are mainly made of thermoplastic synthetic fibers. The conductive fiber 11 is a thermoplastic synthetic fiber having a cyano group in which copper sulfide is introduced, and the adhesive 16
Is a carboxylated modified styrene-butadiene rubber latex having a glass transition temperature of -20 ° C to -45 ° C, and an antistatic agent having a solid content of 20 to 60 parts by weight and an antistatic agent of not more than 60 parts by weight based on 100 parts by weight of the solid content. And the antistatic agent has a specific surface area of 5
200 g / m ² or more and a length 0.5 to 3.0 mm, and a third characterized by a diameter of less fibrous carbon black 20 [mu] m.

A fourth feature of the carpet according to the present invention is that
In addition to the third feature, the conductive fiber 11 is a conductive acrylic fiber into which copper sulfide is introduced.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The conductive fibers 11 may be mixed with the warp and the weft constituting the base fabric 12. For double raschel warp knitted carpets, pile stitching 15
Has formed a needle loop integrated with the ground warp constituting the base cloth 12, and the conductive fibers 11 mixed with the pile yarn are exposed on the front and back of the base cloth 12. The conductive fibers 11 exposed on the front side (pile surface side) greatly contribute to the electricity control on the pile surface. Therefore,
Preferably, the present invention is applied to a double raschel warp knit pile fabric.

A thermoplastic synthetic fiber which is a main material of the pile yarn,
And, the thermoplastic synthetic fiber used as the material of the conductive fiber is a polyester fiber or an acrylic fiber having the same synthetic fiber, preferably a cyano group, and the introduction of copper sulfide is easy. Use acrylic fiber with good adhesion and good adhesion to butadiene rubber latex. Methods for introducing copper sulfide into polyester fibers and acrylic fibers are described in JP-B-62-52071 and JP-B-63
-14112, JP-B-63-19629, JP-B-63-
47824 and Japanese Patent Publication No. 1-37513.

The reason why the glass transition temperature of the carboxylated modified styrene / butadiene / rubber latex which is the main material of the adhesive 16 is -45 ° C. or more is because the coating film of the adhesive 16 becomes viscous at room temperature and the pile 13 This is to prevent the carpet from easily falling off and the coating film of the adhesive 16 to be softened and the shape stability and the dimensional stability of the carpet do not decrease. On the other hand, the reason why the glass transition temperature is set to -20 ° C. or lower is that the coating film of the adhesive 16 is hardened in cold winter, and cracks occur in the coating film of the adhesive 16 during construction and use of carpet. This is to prevent the electric effect from being impaired. The glass transition temperature of the carboxylated modified styrene / butadiene / rubber latex is set by the ratio between the styrene monomer and the butadiene monomer which are polymerization components.

A fibrous carbon black having a specific surface area of 500 g / m ² or more is known as a Ketchin-type carbon black, and a rayon-based carbon fiber, an acrylic-based carbon fiber, or another carbon fiber is heated to 600 ° C. And fired. In the present invention, the length is 0.5 mm, and the blending amount is 20P. H. R. (20 parts by weight with respect to 100 parts by weight of the rubber latex solid content, the same applies hereinafter) The reason for this is that the adhesive 16 is electrically connected in the coating film. Also, the length is 3.0
mm or less in order to uniformly disperse in the coating film of the adhesive 16, the diameter is 20 μm or less, and the H. R. The following is to prevent the fibrous carbon black from making the coating film of the adhesive 16 rigid and easily cracked. The specific resistance of this fibrous carbon black is 40% R. H. At 10 ⁴ Ω / cm or less.

The adhesive 16 includes aluminum hydroxide as a flame retardant, barium sulfate as a sound insulating agent, zeolite as a deodorant, silica gel as a moisturizer / humidifier, and calcium carbonate as a viscosity modifier. Fine powder is blended. However, since these solid fine powders make the coating film of the adhesive 16 rigid and easy to crack, the compounding amount is 60%.
P. H. R. The following is assumed. In addition, in order to make the coating film of the adhesive 16 difficult to crack, the total blending amount of these solid fine powder and fibrous carbon black should be 100 P. H. R. It is better to do the following.

The adhesive 16 contains a stabilizer, a dispersant, a thickener, a preservative, an antifoaming agent and the like in addition to the solid fine powder and the fibrous carbon black, and has a viscosity of 20,000 ± 100.
It is adjusted to 0 cps (BM viscometer No. 4 manufactured by Tokyo Keiki Co., Ltd., 6 rotations), and is applied using a doctor or a roll coater. A secondary base fabric can be attached to the applied surface.

[0016]

According to the present invention (claims 1 and 3), the conductive fibers 11 are mixed not only in a part of the pile but also in all the piles 13, so that the pile surface does not give an unnatural feeling. When mixed in all the piles 13 as described above, the mixing ratio of the conductive fibers 11 in each pile 13 can be reduced, and the conductive fibers 11 do not impair the appearance and texture of the pile surface. However, when mixed in all piles 13 as described above, even when the mixing ratio is as small as about 0.01 to 0.2% by weight, the resulting antistatic effect is uniform over the entire pile surface. Arises
Since the mixing ratio can be reduced in such a manner, the appearance and feel of the pile surface are hardly impaired by the conductive fibers 11.

In the present invention (claims 1 and 3), the coating film of the adhesive 16 for grounding static electricity captured by the conductive fiber 11 has a glass transition temperature of -20 ° C. or less, which is hard to be cured even under cold conditions. The main component is a carboxylated modified styrene / butadiene / rubber latex, and the amount of the solid fine powder contained therein is small. Carbon black, which is a solid fine powder, also has a specific surface area of 500 g / m ² or more and a length of 0. .
It is a fibrous material having a diameter of 5 to 3.0 mm and a diameter of 20 μm or less, and is well suited to a carboxylated modified styrene / butadiene / rubber latex without a vulcanizing agent or a vulcanization accelerator as a main material of the adhesive, Further, the compounding amount of the solid fine powder containing carbon black is set to 120 P.S. H. R. Since the thickness is set as follows, the coating film of the adhesive 16 is not particularly hardened and easily cracked. However, in the double raschel warp knitted carpet and the tufted carpet, the base of the pile adjacent to the pile yarn in the length direction is piled. 14 and the root 14 of the pile are electrically connected to each other in the length direction of the pile yarn via the back stitch 15, and all the piles 13 are made of the conductive fiber 1.
1 is grounded to the coating of the adhesive 16 via
Even when the carpet that has been rolled up and stored is taken out in winter, it is possible to prevent the coating film of the adhesive 16 from cracking and impairing the antistatic effect.

According to the present invention (claims 2 and 4),
The conductive fiber 11 is an acrylic fiber which is excellent in light resistance and hardly deteriorates and discolors over time. Since it has a cyano group, copper sulfide is easily introduced, and carboxylated modified styrene.
The static electricity captured by the conductive fibers 11 on the pile surface is reliably grounded via the adhesive 16 without being adhered to butadiene rubber latex and firmly adhered and peeled off. The acrylic fiber serving as the base of the conductive fiber 11 can be dyed. Particularly, when the main material of the pile 13 is the same acrylic fiber as the conductive fiber 11, the conductive fiber 11 is combined with the pile 13 by post-dyeing. The anti-static carpet, which has almost the same appearance and texture as a general non-static carpet, can be obtained.

As described above, according to the present invention, the conductive fiber 1
The use of No. 1 does not cause any discomfort on the pile surface,
Even if it is a double Raschel warp knitted carpet or a tufted carpet having a thin cloth as a base cloth, the base cloth is formed by a ground warp needle loop integrated with a back stitch of a pile yarn, the soft base cloth Thus, an antistatic carpet can be obtained in which the coating of the conductive adhesive is not cracked due to the flexibility and stretchability of the antistatic carpet, and the antistatic effect does not deteriorate over time.

[Brief description of the drawings]

FIG. 1 is a sectional side view of an antistatic carpet according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Conductive fiber 12 Base cloth 13 Pile 14 Base of pile 15 Back stitch 16 Adhesive

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) // D06M 101: 28 D06M 11/16 F term (Reference) 3B120 AA14 AB02 AD07X AD07Y AD07Z AD17X AD17Y AD17Z BA02 BA24 BA28 BA31 CA02 CA03 CA12 CA13 EB08 EB09 4L002 AA05 AC03 CA01 CB03 DA03 EA00 4L031 AB31 AB33 BA02 DA14 4L033 AB01 AB04 AB06 AC06 CA68 DA00 4L044 CA11 CB08 CC02

Claims (4)

[Claims] 1. In a double raschel warp knitted carpet finished by applying an adhesive 16 to the entire back stitch surface of a double raschel warp knit pile fabric, all the piles 13 are made of thermoplastic synthetic fiber as a main material and 1 weight % Of the conductive fibers 11 are mixed, and the conductive fibers 11 are thermoplastic synthetic fibers having a cyano group into which copper sulfide is introduced, and the adhesive 16 has a glass transition temperature− Carboxylated modified styrene-butadiene rubber latex at 20 ° C to -45 ° C as the main material,
It is prepared by blending 20 to 60 parts by weight of an antistatic agent and 60 parts by weight or less of a solid fine powder with respect to 100 parts by weight of the solid content, and the antistatic agent has a specific surface area of 500 parts by weight.
g / m ² or more, length 0.5 to 3.0 mm, diameter 20
An antistatic carpet, which is a fibrous carbon black having a size of not more than μm. 2. The antistatic carpet according to claim 1, wherein the conductive fiber 11 according to claim 1 is a conductive acrylic fiber into which copper sulfide has been introduced. 3. In a tufted carpet finished by applying an adhesive 16 to the entire back stitch surface of the tufted pile fabric, all the piles 13 are less than 1% by weight mainly composed of thermoplastic synthetic fibers. The conductive fiber 11 is composed of a pile yarn in which the conductive fiber 11 is mixed, the conductive fiber 11 is a thermoplastic synthetic fiber having a cyano group into which copper sulfide is introduced, and the adhesive 16 has a glass transition temperature of −20.
The main material is carboxylated modified styrene / butadiene / rubber latex at a temperature of ℃ to -45 ° C, and an antistatic agent of 20 to 60 parts by weight and a solid fine powder of 60 parts by weight or less are mixed with 100 parts by weight of the solid content. Wherein the antistatic agent is a fibrous carbon black having a specific surface area of 500 g / m ² or more, a length of 0.5 to 3.0 mm, and a diameter of 20 μm or less. Sex carpet. 4. The antistatic carpet according to claim 3, wherein the conductive fibers 11 according to claim 3 are conductive acrylic fibers into which copper sulfide is introduced.