JP2003272889A - Conductive elastic net - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a conductive net that has a high electrostatic removal effect. <P>SOLUTION: This is a conductive net of which the braided leg part has elasticity. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductive net for a flexible container for safely handling triboelectric powder.

[0002]

2. Description of the Related Art Flexible containers are often used as containers for powder transportation. When powder is transported using this flexible container, static electricity is generated due to friction between the powder particles and friction between the powder and the inner wall of the flexible container, resulting in electrostatic charge of the powder, resulting in dust explosion. May occur. Also, not only when carrying powder, but also when filling a flexible container with powder or when discharging powder from a flexible container.
The above problems occur when handling a wide range of powders. In order to avoid such a danger, for example, a method in which the fabric itself forming the flexible container is made of conductive fibers and static electricity generated by friction is allowed to escape through the conductive fibers can be considered.
However, since conductive fibers are expensive, it is not preferable to use a fabric made of conductive fibers in terms of cost.

Therefore, if a net is made of conductive fibers instead of a cloth and the conductive net is wrapped around a flexible container to cover the flexible container, static electricity caused by friction can be released through the conductive fibers. It is possible to avoid the possibility of dust explosion and reduce the manufacturing cost of the conductive net. Such a conventional conductive net will be described with reference to FIG. Tapes 2 are present above and below the conductive net, as shown in FIG. The tape 2 has a function of preventing fraying of the net portion 1 and a function of improving handleability. Moreover, the string 3 is for binding both ends of the conductive net and winding the conductive net around the flexible container.

[0004]

DISCLOSURE OF THE INVENTION The present invention has a conductive net in which the effect of removing static electricity caused by friction during powder transportation (hereinafter, also simply referred to as "static electricity removing effect") is enhanced. The purpose is to provide.

[0005]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the inventors of the present invention have found that the knitted leg has a stretchable conductive net, especially 50% of the knitted leg spreads. We have succeeded in producing a conductive net that exceeds the limit, and due to its elasticity, such a conductive net fits in a flexible container more than conventional conductive nets.
It was found that the static electricity removal effect is improved. The present inventors have conducted further studies and completed the present invention.

That is, according to the present invention, (1) a conductive net having a knitted leg portion having elasticity, (2)
Formula 1 below: Elongation of knitted leg part (%) = {(L ₁ −L ₀ ) / L ₀ } × 100 [Formula 1] (where L ₀ is the length (cm) of the knitted leg part before elongation) The L ₁
Indicates the length (cm) of the knitted leg portion after stretching. ) The elongation of the knitted leg portion is 50% or more, the conductive net according to (1) above, and (3) the conductive fiber or moisturizing fiber as described above, The conductive net according to (1) or (2), (4) conductive fibers containing (a) copper sulfide via a cyano group, (b) fibers plated with a metal, and (C) The conductive net according to (3) above, which is one or more fibers selected from the group consisting of carbon fibers.
(5) The conductive net according to (4) above, wherein the metal-plated fiber is a metal-plated polyparaphenylene terephthalamide fiber.

Further, the present invention (6) further comprises (3) to (3), which further includes a fiber having rubber elasticity.
The conductive net according to (5), (7) the fiber having rubber elasticity is a polyurethane elastic fiber or a polybutylene terephthalate fiber, and the conductive net according to (6) above, (8) ) A conductive net according to (6) or (7), characterized in that the fiber having rubber elasticity is covered with an inelastic thread.
It has a conductive fiber and a polyurethane-based elastic fiber covered with a non-elastic yarn, and has the following mathematical expression 1; knitted leg elongation (%) = {(L ₁ −L ₀ ) / L ₀ } × 100 [equation 1] (wherein, _{L 0} is the length of Hen'ashi portion before extending the (cm), _{L 1}
Indicates the length (cm) of the knitted leg portion after stretching. ), The stretch of the knitted leg portion is 50% or more, and a conductive net.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The conductive net of the present invention is characterized in that the knitted leg portion has elasticity. here,
The knitted leg portion is a portion indicated by reference numeral 4 in FIG. That is, FIG. 2 is a schematic diagram when a part of the net portion is enlarged. Usually, a portion where the yarns forming the net and the yarns overlap each other is referred to as a joint portion 5, and between the joint portions. The yarn is the knitted leg portion 4. With such a structure, the stretchability of the conductive net is improved, the fit of the conductive net to the flexible container is improved, and as a result, the static electricity removing effect is enhanced.

In the conductive net according to the present invention, the elongation of the knitted leg portion is about 50% or more, preferably about 80% or more,
It is more preferably about 100% or more.
Here, the elongation of the knitted leg portion can be calculated from the equation shown below. Elongation of knitted leg portion (%) = {(L ₁ −L ₀ ) / L ₀ } × 100 [Equation 1] (where L ₀ is the length (cm) of the knitted leg portion before extension, L ₁
Indicates the length (cm) of the knitted leg portion after stretching. ) More specifically, L ₁ is JIS L 1043 (199).
2) Synthetic fiber fishnet knitted fabric test method It is obtained by extending the knitting leg portion and measuring the length immediately before the knitting leg portion is cut according to the method of the 6.11 hooking strength test.

The conductive net according to the present invention preferably contains conductive fibers. As the conductive fiber, known ones may be used, for example, (a) a fiber containing copper sulfide through a cyano group, (b) a metal-plated fiber or (c) carbon. Fiber etc. are mentioned. In addition, as the conductive fiber, (a) ~
You may use combining 2 or more types of (c).

As the fiber (a) containing copper sulfide via a cyano group, known fibers may be used. For example, an acrylic fiber or a fiber in which copper sulfide is chemically bonded to an acrylic fiber, or the like can be given. For example, Japanese Patent No. 144616.
No. 8 and Japanese Patent No. 1414506. As the raw material of the fiber containing copper sulfide through the cyano group, acrylic fiber or acrylic fiber is particularly preferable, but the material is not limited to this and any fiber having a cyano group may be used. For example, fibers in which a cyano group is introduced by simultaneously adding and polymerizing a monomer having a cyano group at the time of synthesizing polyamide fiber such as nylon or aramid or polyester fiber are included.

The method for producing the fiber containing copper sulfide through the cyano group may be according to a known production method, but a preferable production method is, for example, an aqueous bath containing monovalent copper ions and thiosulfate ions. There is a method in which a fiber having a cyano group is brought into contact with and the copper sulfide is bonded onto the fiber having the cyano group. The aqueous bath need only contain monovalent copper ions and thiosulfate ions, where the source of thiosulfate ions is not restricted.

The monovalent copper ion contained in the above-mentioned aqueous bath can be produced preferably by using a combination of a divalent copper salt and a reducing agent. In this case, as the divalent copper salt, any salt can be used as long as it can generate divalent copper ions in an aqueous bath, and examples of such salts include cupric sulfate and dichloride. Examples include copper and cupric nitrate. As the reducing agent capable of reducing divalent copper ions to monovalent copper ions, conventionally known reducing agents may be used, and examples thereof include metallic copper, ferrous sulfate, ammonium vanadate, and sodium hypophosphite. Examples include various reducing agents such as hydroxylamine sulfate, furfural, glucose, thiosulfate, pyrosulfite, and acid sulfite. Furthermore,
As the thiosulfate ion source contained in the aqueous bath, a thiosulfate salt such as sodium thiosulfate or potassium thiosulfate is preferably used, but any source capable of producing thiosulfate ion in the aqueous bath may be used. In addition, since the thiosulfate ion also acts as a reducing agent for the divalent copper ion as exemplified as the reducing agent, this thiosulfate ion can also be used as a reducing agent.

If desired, a pH adjusting agent or a pH buffering agent may be added to the above-mentioned aqueous bath. For example, inorganic acids such as sulfuric acid or hydrochloric acid, organic acids such as citric acid or acetic acid, and salts thereof. Or a combination of an acid such as citric acid and disodium phosphate and a salt. By using such a pH adjuster, the binding rate of copper sulfide to the fiber having a cyano group can be adjusted. The treatment temperature is usually about 30 to 120 ° C, preferably about 40 to 100 ° C. The treatment time may be shorter as the temperature becomes higher, but the strength of the fiber having a cyano group may be lowered, and if the temperature is too low, the treatment time becomes long. Therefore, the treatment is preferably carried out within the above range. If the amount of copper sulfide contained in the fiber is too small, it is not possible to obtain sufficient conductivity, and as the amount is larger, the conductivity becomes better but the hue and other physical properties of the fiber may deteriorate.
It is preferable to contain about 1 to 30% by weight based on the total weight of the fiber. Further, the above-mentioned fiber containing copper sulfide through a cyano group is commercially available and can be suitably used in the present invention. Examples of commercially available products include Thunderon (registered trademark, manufactured by Japan Silkworm Dyeing Co., Ltd.).

(B) The metal-plated fiber can be manufactured by a known manufacturing method. The fibers used here are not particularly limited, and known fibers may be used. Examples thereof include organic synthetic fibers such as polyester fibers, polyamide fibers represented by nylon such as nylon 66, nylon 6, nylon 11, nylon 610 and the like, polyethylene fibers, and inorganic fibers such as glass fibers. The organic synthetic fibers also include organic polymer fibers such as aramid fibers, wholly aromatic polyester fibers, polyamide fibers, and polyparaphenylene bisoxazole fibers. The aramid fibers are roughly divided into meta-aramid fibers and para-aramid fibers, and the former include meta-type wholly aromatic polyamide fibers such as polymetaphenylene isophthalamide fibers (Dupont, trade name Nomex). As the latter, for example, polyparaphenylene terephthalamide (manufactured by Toray-Dupont, trade name: Kevlar) and copolyparaphenylene-3,
Para-type wholly aromatic polyamide fibers such as 4′-diphenyl ether terephthalamide fiber (manufactured by Teijin Ltd., trade name Technora) are mentioned. Above all, it is preferable to use a fiber obtained by plating a paraamide fiber, particularly a polyparaphenylene terephthalamide fiber with a metal.

The fiber may be plated by a known plating method such as a vacuum deposition method, a sputtering method, an electroplating method or an electroless plating method. Among them, the electroless plating method is preferably used from the economical and environmental viewpoints. The electroless plating method will be described below.

According to one of the preferred embodiments of the electroless plating method, a fiber having a metal adhered to its surface is produced as follows. That is, first of all, a step of etching the fiber is performed, then a silane coupling agent is caused to act on the etched fiber to form a fiber having the silane coupling agent fixed to the fiber surface, and further fixed to the fiber surface. Metal particles are produced by metalizing the silane coupling agent through the silane coupling agent to form fibers fixed on the fiber surface, and the metallized fiber has a greater ionization tendency than the metalized metal. A metal-plated fiber can be produced by subjecting the compound to electroless plating.

In the above electroless plating method, for example, when a fiber whose surface is already uneven due to rubbing treatment using a paper file or plasma treatment is used,
The etching process may be omitted. In the above electroless plating method, when the treatment steps are continuous, after finishing each treatment step, the object to be treated is washed with water to remove the attached chemicals. Also in the invention, it is appropriately carried out according to a conventional method.

Each step of the above electroless plating method will be described in detail. The etching treatment here is performed in order to increase the surface area of the fiber, which gives the surface of the fiber a porous structure. As the etching treatment method, a method of using a chromic acid / sulfuric acid mixed liquid and immersing the fiber in the mixed liquid is adopted. The chromic acid-sulfuric acid mixture used is a mixed solution of chromic anhydride, potassium dichromate or sodium dichromate, etc. or an aqueous solution thereof and concentrated sulfuric acid, and various concentrations are known. It is not particularly limited. Specifically, about 5 g to 500 g of chromic anhydride or chromate per 100 liters of mixed liquid and concentrated sulfuric acid 100 mL to 9
Includes about 50 mL, preferably about 3 g to 500 g of chromic anhydride or chromate and concentrated sulfuric acid 150 mL
What contains ~ 850 mL is used. Soaking 40
C. to 70.degree. C., and the immersion time varies depending on the concentration of the chemical solution, temperature, etc., but is about 1 to 30 minutes, preferably about 5 to 5.
It takes about 20 minutes. It is preferable that the fibers subjected to the immersion treatment are washed with water to remove the mixed liquid, and in order to detoxify the attached hexavalent chromium, the fibers are subjected to the immersion cleaning treatment with an aqueous solution of sodium sulfite, sulfite water, Rongalit or the like.
This reduces hexavalent chromium to trivalent chromium and removes it from the fiber.

The fibers that have been etched as described above are then treated with a silane coupling agent. Examples of the silane coupling agent used include γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, imidazoline silane, N-aminoethylaminopropyltrimethoxysilane, N-phenyl-
γ-aminopropyltrimethoxysilane, N-β- (N
-Vinylbenzylaminoethyl) -γ-aminopropyltrimethoxysilane hydrochloride, N-3- (4- (3-aminopropoxy) butoxy) propyl-3-aminopropyltrimethoxysilane, aminosilanes such as triazinesilane, γ -Glycidoxypropyltrimethoxysilane, 4-glycidylbutyltrimethoxysilane, γ-glycidoxypropylmethyldiethoxysilane, β-
Epoxysilanes such as (3,4-epoxycyclohexyl) ethyltrimethoxysilane, chlorosilanes such as γ-chloropropyltrimethoxysilane, methacrylsilanes such as γ-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane and vinyl. Vinylsilanes such as triethoxysilane may be mentioned. Among the silane coupling agents listed here, those having a nitrogen atom are preferred for the present invention, and those having two or more nitrogen atoms are more preferred.

The silane coupling agent used here is appropriately dissolved in a solvent before use. As the solvent,
Examples thereof include water, lower alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol and isobutyl alcohol, and ethers such as isopropyl ether, tetrahydrofuran and dioxane. These are used alone or as a mixture of two or more. The treatment with the silane coupling agent is carried out by immersing the fiber in a solution in which the silane coupling agent is dissolved in a concentration of about 0.01 to 20% by volume, preferably about 0.1 to 5% by volume. In this way, a fiber having a silane coupling agent fixed to the surface of the fiber is obtained. Metallization is performed and the metal particles are bonded to the silane coupling agent. This makes it possible to obtain a fiber in which metal particles are fixed to the fiber surface via the silane coupling agent. The metal of the metal particles is preferably a transition metal.

Here, the metallizing treatment is carried out using an aqueous solution of palladium chloride, a solution containing stannous chloride, hydrochloric acid and water, and a solution containing palladium chloride, hydrochloric acid and water in this order, and further using palladium chloride. It is carried out by immersing the fiber in which the silane coupling agent is fixed on the fiber surface, using a solution containing a mixture of tin chloride, hydrochloric acid and water. By such a treatment, fibers in which the palladium metal particles are fixed to the fiber surface via the silane coupling agent can be obtained. By applying a metallizing treatment to the fiber,
It is expected that the adherence of the plated metal deposited in the subsequent electroless plating treatment will be improved and the deposit will be even.

The metal particles obtained as described above are fixed to the fiber surface via a silane coupling agent, and the fibers are subjected to electroless plating to prepare the metal-plated fibers used in the present invention. can do. Here, the electroless plating process is performed as follows. That is, in electroless plating, a reducing agent is added to an aqueous solution of a metal compound to deposit a metal on an object to be plated, thereby forming a metal film. The metal used here may be any metal having a greater ionization tendency than the metal of the metal particles fixed to the fiber surface, copper, nickel, cobalt,
It may be tin, silver, gold or the like, and may be used alone or may be used for forming a film as an alloy with nickel, cobalt, iron, tungsten, boron, phosphorus or the like. Among them, gold, silver, copper, tin, aluminum or alloys thereof are preferable. An aqueous solution of the above metal compound is prepared using these metal salts. Examples of the metal salt include copper sulfate, basic copper carbonate, nickel sulfate, nickel acetate, nickel chloride, basic nickel carbonate, cobalt chloride, cobalt sulfate, cobalt acetate, stannous chloride, silver nitrate, and silver bromide. Salts of potassium, gold chloride, potassium cyanide, etc. are used.

As the reducing agent to be used next, hydrazine acid addition salts such as formaldehyde, hydrazine sulfate, hydrazine hydrochloride, sodium hypophosphite, sodium borohydride, tartaric acid or its salts (for example, sodium or potassium salts), glucose Etc. Further, in the electroless plating, the metal salt as the main component and the reducing agent become deficient as the metal deposition reaction progresses, so it is usually necessary to supplement them. In addition, it is preferable to add various compounds, since the change of pH in the plating bath caused by the oxidation of the reducing agent and the accelerating aging of the plating bath due to the products occur.
As the compound to be added, sodium hydroxide, sodium carbonate, sodium hydrogen carbonate, sodium acetate,
Examples thereof include sodium glycolate, citric acid, succinic acid, ethylenediaminetetraacetic acid, triethanolamine, ammonium chloride, ammonium sulfate, ammonium hydroxide, ethylenediamine, diethyltriamine, triethylenetetramine, malonic acid, glutamic acid, lactic acid, and Rossell salt.

Incidentally, if an electroless plating bath is taken as an example,
There are the following. That is, in the case of (a) copper; copper sulfate, sodium carbonate, tartrate,
Ethylenediaminetetraacetic acid, triethanolamine, sodium hydroxide aqueous solution, formalin aqueous solution mixed, (b) In the case of nickel; nickel sulfate, sodium hypophosphite, sodium glycolate, sodium acetate aqueous solution mixed, ( c) In the case of nickel-cobalt; examples thereof include a mixture of nickel chloride, cobalt chloride, hydrazine hydrochloride, sodium tartrate, and an aqueous solution of thiourea. Further, the metal-plated fiber obtained by the electroless treatment as described above may be further electrolytically plated with a metal having a greater ionization tendency (for example, gold plating, platinum plating, palladium plating, etc.) according to a conventional method. The thickness of the metal plating layer formed is not particularly limited, but is about 0.3 to 10 μm.
It is preferably about 1.0 to 5.0 μm, and more preferably about 1.0 to 5.0 μm.

As the carbon fiber (c), known carbon fibers may be used, and examples thereof include rayon-based carbon fibers, polyacrylonitrile-based carbon fibers, lignin polyvinyl alcohol-based carbon fibers and pitch-based carbon fibers. In the present invention, a commercially available product may be used, and examples thereof include trading card (trade name, manufactured by Toray Industries, Inc.). The carbon fiber may be a spun yarn or a twisted yarn in addition to the filament yarn, and a commercially available product such as SA-7 (trade name, manufactured by Toray Industries, Inc.) may be used.

The conductive net according to the present invention may contain moisturizing fibers. Since the moisturizing fiber absorbs moisture in the air and can retain the absorbed moisture in the fiber, generation of static electricity can be suppressed, and the moisturizing fiber is not easily charged. As a result, when the conductive net according to the present invention containing the moisturizing fiber is used, it is possible to more effectively suppress the generation of static electricity during powder transportation and, by extension, dust explosion. As the moisturizing fiber, known ones may be used, for example, JP-A-20
The fibers described in JP-A No. 01-348733 and JP-A No. 6-299414 may be used. As the moisturizing fiber, a commercially available product may be used, and examples thereof include cube (trade name, manufactured by Toray Industries, Inc.).

The conductive net according to the present invention preferably has fibers having rubber elasticity (hereinafter referred to as rubber elastic fibers). Examples of the rubber elastic fiber include polyurethane elastic fiber and polybutylene terephthalate fiber.

The polyurethane elastic fiber, which is a preferred embodiment of the rubber elastic fiber, is not particularly limited and may be a known one.
It is preferably composed of a polyurethane polymer obtained by reacting a polyfunctional active hydrogen compound.

Examples of the polymer diol include polyester diol, polycarbonate diol, polylactone diol, polyether diol, polyester amide diol, polyester ether diol and the like. The polyester diol can be obtained by reacting an alkane diol with a dicarboxylic acid or an ester-forming derivative thereof under the conditions adopted in a general polyester-forming reaction. The alkanediol preferably has about 6 to 10 carbon atoms, and specific examples thereof include ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol and 2,2-.
Dimethyl-1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 3-methyl-1,
5-pentanediol, 1,6-hexanediol, 2
-Methyl-1,8-octanediol, 1,9-nonanediol, 1,10-decanediol and the like can be mentioned. Typical examples of the dicarboxylic acid include maleic acid, itaconic acid, malonic acid, succinic acid, glutaric acid, adipic acid, azelaic acid, sebacic acid and other aliphatic dicarboxylic acids, phthalic acid, terephthalic acid, isophthalic acid and the like. . These dicarboxylic acids may be used in the form of ester-forming derivatives. Typical examples at that time include lower alkyl esters such as methyl and ethyl esters of the above-exemplified dicarboxylic acids. The above dicarboxylic acid or its ester-forming derivative may be used alone or
It may of course be used in a mixture of more than one species.

The above polycarbonate diol is produced by a transesterification reaction between an alkylene glycol and a carbonic acid ester, or a reaction between phosgene or a chloroformate and an alkylene glycol. Examples of the alkylene glycol include ethylene glycol, 1,
4-butanediol, 1,6-hexanediol, 1,
A straight-chain alkylene glycol having 2 to 10 carbon atoms which may have an oxygen atom in the alkylene portion such as 9-nonanediol, 1,10-decanediol or diethylene glycol, or 2-methyl-1,3-propanediol. , Neopentyl glycol, 3-methyl-1,
A branched alkylene glycol having 4 to 10 carbon atoms such as 5-pentanediol or 2-methyl-1,8-octanediol is preferably used alone or as a mixture of two or more kinds. Typical examples of the carbonic acid ester include diphenyl carbonate, diethyl carbonate, ethylene carbonate, propylene carbonate and the like.

Examples of the polylactone diol include:
Examples thereof include poly-ε-caprolactone diol and poly-β-methyl-δ-valerolactone diol. These polylactone diols are produced by ring-opening polymerization of lactone using alkylene glycol or the like as an initiator. As the polyether diol,
For example, a homopolyether diol such as polyoxyethylene glycol, polyoxypropylene glycol, polyoxytetramethylene glycol or polyoxypentamethylene glycol, or 2 having 2 to 6 carbon atoms.
Examples thereof include copolymerized polyether diols composed of one or more oxyalkylenes.

As the isocyanate used in the present invention, known ones may be used, but it is particularly preferable to use an organic diisocyanate. Examples of the organic diisocyanate include aliphatic, alicyclic and aromatic diisocyanates. Examples of the aromatic diisocyanate include diphenylmethane diisocyanate, 1,4-diisocyanate benzene, xylylene diisocyanate, 2,6-naphthalene diisocyanate, methylene-
Bis (4-phenylisocyanate), methylene-bis (3-methyl-4-phenylisocyanate), 2,4
-Tolylene diisocyanate, 2,6-tolylene diisocyanate, m- or p-xylylene diisocyanate, α, α, α ', α'-tetramethyl-xylylene diisocyanate, m- or p-phenylene diisocyanate, 4,4 '-Dimethyl-1,3-xylylene diisocyanate, 1-alkylphenylene-2,4 or 2,6-diisocyanate, 3- (α-isocyanatoethyl) phenyl isocyanate, 2,6-diethylphenylene-1,4-diisocyanate , Diphenyl-dimethylmethane-4,4-diisocyanate, diphenylether-4,4'-diisocyanate or naphthylene-1,5-diisocyanate.

Examples of the alicyclic diisocyanate include methylene bis (cyclohexyl isocyanate),
Isophorone diisocyanate, methylcyclohexane 2,4-diisocyanate, methylcyclohexane 2,
6-diisocyanate, g, cyclohexane 1,4-diisocyanate, hexahydroxylylene diisocyanate, hexahydrotolylene diisocyanate, octahydro 1,5-naphthalene diisocyanate, methylene-bis (4-cyclohexyl isocyanate), 1,3
-Or 1,4-cyclohexylene diisocyanate can be used. Examples of the aliphatic diisocyanate include 1,6-hexamethylene diisocyanate, trimethylene diisocyanate, tetramethylene diisocyanate, pentamethylene diisocyanate and hexamethylene diisocyanate.

Examples of the polyfunctional active hydrogen compound used in the present invention include polyfunctional hydroxy compounds, diamines and amino alcohols. Examples of the polyfunctional hydroxy compound include glycerin, trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, 2-hydroxyethyl-1,6-hexanediol, 1,2,4-butanetriol, Trifunctional or higher polyhydric alcohols such as erythritol, sorbitol, pentaerythritol, and dipentaerythritol; or ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol,
Tripropylene glycol, 1,2-butanediol,
1,3-butanediol, 1,4-butanediol,
2,3-butanediol, 2-methyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-methyl-2-propyl-1,3-propanediol, 2-butyl- 2-ethyl-1,3-propanediol, 1,5-pentanediol, 3-methyl-1,
5-pentanediol, 2-methyl-2,4-pentanediol, 1,6-hexanediol, 2-ethyl-
1,3-hexanediol, neopentyl glycol,
1,3,5-trimethyl-1,3-pentanediol,
2,2,4-trimethyl-1,3-pentanediol,
1,8-octanediol, 1,9-nonanediol,
Aliphatic glycols such as 2-methyl-1,8-octanediol, alicyclic glycols such as 1,4-cyclohexanediol and 1,4-cyclohexanedimethanol, xylylene glycol, bishydroxyethoxybenzene, etc. Monomer glycols such as aromatic glycols are listed.

As the polyfunctional hydroxy compound, a high molecular weight polyol, for example, a polyether polyol, a polyester polyol, a polyether ester polyol, a polycarbonate polyol, a poly polyol which is a reaction product of bisphenol A and ethylene oxide or propylene oxide. Similarly, polyols such as acrylic polyol can be mentioned. Examples of the polyether polyols include glycols such as ethylene glycol, propylene glycol and diethylene glycol; trifunctional or higher functional polyols such as glycerin, trimethylolethane, trimethylolpropane and pentaerythritol, or polyamines such as ethylenediamine and toluenediamine. Examples thereof include hydroxyl group-containing polyether polyols obtained by addition-polymerizing alkylene oxides such as ethylene oxide and propylene oxide; or polytetramethylene ether glycol obtained by ring-opening polymerization of tetrahydrofuran.

Examples of the polyester polyol include dicarboxylic acids such as succinic acid, adipic acid, sebacic acid, azelaic acid and phthalic acid, carboxylic acids such as tri- and tetracarboxylic acids such as trimellitic acid and pyromellitic acid, and diols. (For example, ethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 2,2-diethylpropanediol,
2-ethyl-2-butylpropanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, 1,4-cyclohexanediol, 1,4
-Cyclohexanedimethanol etc.), triols (eg trimethylolpropane, glycerin etc.) or polyhydroxy compounds (eg bisphenol A,
Examples thereof include those obtained by polycondensation reaction with bisphenol F). The polyether ester polyol can be obtained, for example, by reacting an ether group-containing diol or a mixture thereof with another glycol with the dicarboxylic acid or an anhydride thereof, or by reacting a polyester glycol with an alkylene oxide. Examples thereof include poly (polytetramethylene ether) adipate.

Examples of the polycarbonate polyol include a dealcoholization condensation reaction of a polyhydric alcohol and a dialkyl carbonate such as dimethyl carbonate or diethyl carbonate, a dephenol condensation reaction of a polyhydric alcohol and diphenyl carbonate, or a removal of a polyhydric alcohol and ethylene carbonate. Polycarbonate polyols obtained by ethylene glycol condensation reaction and the like can be mentioned. Examples of the polyhydric alcohol used in this condensation reaction include 1,6-hexanediol, diethylene glycol, propylene glycol, 1,4-butanediol, 1,5-pentanediol and 3-methyl-
1,5-pentanediol, 2,2-diethylpropanediol, 2-ethyl-2-butylpropanediol,
Aliphatic diols such as neopentyl glycol; 1,4-
A cycloaliphatic diol such as cyclohexanediol and 1,4-cyclohexanedimethanol can be used.

Examples of diamines as other polyfunctional active hydrogen compounds include, for example, hexamethylenediamine, xylenediamine, isophoronediamine, N, N-.
Examples include dimethylethylenediamine, and examples of amino alcohols include monoethanolamine and diethanolamine.

As the method for reacting the above-mentioned polymer diol, isocyanate, and polyfunctional active hydrogen compound to obtain a polyurethane polymer, a known method such as a melt polymerization method or a solution polymerization method may be used. At that time, if desired, a crosslinking agent, an emulsifying agent, a stabilizer, a surfactant as a cell adjusting agent, a foaming agent, a filler, a coloring agent, an oxidation stabilizer and the like can be used.

As a method for obtaining a polyurethane elastic fiber from the polyurethane polymer obtained as described above,
Known methods may be used. Specifically, the polyurethane elastic fiber used in the present invention can be obtained by dry spinning the above polyurethane polymer solution. The spinning conditions during the dry spinning are not particularly limited, and known spinning conditions may be used. In particular, from the viewpoint of stably spinning various types of yarns, that is, from a thin yarn to a thick yarn, it is preferable that the temperature of the dry atmosphere is higher than the melting point of polyurethane on the high temperature side. Here, the above-mentioned dry atmosphere temperature means the temperature of the gas at the entrance to the spinning machine when the gas for drying is sent under the spinneret.

There is no problem even if the polyurethane elastic fiber used in the present invention contains various stabilizers and pigments. For example, so-called BHT as a light resistance and antioxidant, hindered phenolic drugs such as Sumitizer (registered trademark) GA-80 manufactured by Sumitomo Chemical Co., Ltd., and various "Tinuvin" (registered trademark). Benzotriazole-based drugs, phosphorus-based drugs such as Sumilizer (registered trademark) P-16 manufactured by Sumitomo Chemical Co., Ltd., various hindered amine-based drugs such as "Tinuvin" (registered trademark); titanium oxide, oxidation Inorganic pigments such as zinc and carbon black; metal soaps such as magnesium stearate; bactericides containing silver, zinc and these compounds; deodorants; lubricants such as silicone and mineral oils; barium sulfate, oxidation It may contain various antistatic agents such as cerium, betaine, phosphoric acid, etc. . And, in order to further enhance durability particularly to light and various nitric oxides, for example, nitric oxide scavengers such as HN-150 manufactured by Nippon Hydrazine Co., Ltd., for example, Sumilizer (registered trademark) manufactured by Sumitomo Chemical Co., Ltd. It is preferable to use a thermal oxidation stabilizer such as GA-80 or a light stabilizer such as Sumisorb (registered trademark) 300 # 622 manufactured by Sumitomo Chemical Co., Ltd.

The polybutylene terephthalate (hereinafter abbreviated as PBT) type elastic fiber which is another preferable embodiment of the rubber elastic fiber is not particularly limited and may be a known one. P
PBT, which is a raw material of BT elastic fiber, is usually melt-polymerized with an oligomer obtained by transesterification of dimethyl terephthalate and 1,4-butanediol or direct esterification of terephthalic acid and 1,4-butanediol. It is synthesized by Further, as the PBT, those partially copolymerized with other diol components or dicarboxylic acid components, 4,4′-isopropylidene bis [(2,6-dibromophenoxy) ethoxy-2-ethanol] or 4 , 4'-isopropylidene bis [(2,6
-Dibromophenoxy) -2-ethanol] and other flame retardants and polytetramethylene glycol and other resin modifiers are copolymerized, and further, antioxidants and release agents added during polymerization are also included in the present invention. Can be used. Alternatively, a resin having a high molecular weight obtained by subjecting the PBT chips obtained by the above-mentioned melt polymerization to solid phase polymerization in a vacuum or an inert gas at a temperature equal to or lower than its melting point may be used. Fibers can be produced from the above resins by a known method, and the obtained fibers can be used as rubber elastic fibers in the present invention.

The rubber elastic fiber used in the present invention is not particularly limited in yarn fineness, cross-sectional shape and the like. However, the fineness of the rubber elastic fiber used in the present invention is about 200.
The range of about 1500 dtex is preferable. The rubber elastic fiber may have a circular cross section or a flat cross section.

The rubber elastic fiber used in the present invention is preferably covered with an inelastic yarn (hereinafter, also referred to as covering). The non-elastic yarn may be either filament yarn or spun yarn. As the non-elastic yarn,
Specific examples of the filament yarn include chemically-synthesized fibers such as rayon, acetate, polyamide, polyester, acrylic, polypropylene, vinyl chloride, polyethylene terephthalate or polyvinyl alcohol, or silk (raw silk). The aspect of the filament yarn may be any of a raw yarn, a temporary twisted yarn, a yarn dyed yarn, or the like, or a composite yarn of two or more kinds of fibers. However, these are all easy to twist,
A stable yarn is preferable. The spun yarn as the non-elastic yarn is a natural fiber such as cotton, wool, hemp or silk, or rayon, polyamide, polyester,
A staple made of a compound fiber such as acrylonitrile, polypropylene, vinyl chloride, polyethylene terephthalate or polyvinyl alcohol, and examples thereof include spun yarn in which these are used alone or in a mixed manner. Above all,
As the non-elastic yarn used in the present invention, it is preferable to use polyamide fiber such as nylon, polyethylene terephthalate fiber, acrylic fiber or polyvinyl alcohol fiber.

The fineness and cross-sectional shape of the non-elastic yarn are not particularly limited. However, the fineness of the non-elastic yarn used in the present invention is about 20 to 500 dte.
A range of about x is preferable. Further, for example, the cross section of the non-elastic yarn may be circular or flat.

As a method for coating the rubber elastic fiber with the inelastic yarn, a known method may be used. Specifically, for example, when a filament yarn is used as the non-elastic yarn, a commercially available twisting machine is used, a draft is applied to the rubber elastic fiber serving as the core component, and the non-elastic yarn is wound around the rubber elastic fiber. It can be obtained by coating. The coating of the rubber elastic fiber with the non-elastic yarn may be single or double. That is, the non-elastic yarn may be wound around the rubber elastic fiber by single winding (single covering) or double winding (double covering). In the case of the double winding, it is preferable to use a double covering yarn obtained by winding a non-elastic yarn around a rubber elastic fiber in different directions in the first winding and the second winding. By using such a covering yarn, it is possible to prevent the net from being broken by slip-in when the rubber elastic fiber existing at the center of the covering yarn is broken, improve the light resistance, and retain the strength. In particular, when a polyurethane elastic fiber is used as the rubber elastic fiber, it is preferable to cover the fiber because the fiber has poor light resistance.

When the rubber elastic fiber used in the present invention is the above-mentioned double covering yarn, the non-elastic yarn used for covering is preferably a twisted yarn having the following twist coefficient. That is, the non-elastic yarn used for the first winding (referred to as a lower twisted yarn) preferably has a twist coefficient (K) of about 500 to 1500, and the non-elastic yarn used for the second winding ( The upper twisted yarn) has a twist coefficient (K) of about 70% of the number of lower twists.
It is preferably about 90%. The twist coefficient K is calculated by the following equation;
K = T × D ^1/2 [where T is the number of twists (times / 10 cm),
D: represents fineness (d)].

The conductive net of the present invention may be of any type as long as it is in the form of a net. Further, the conductive net of the present invention has a porosity of about 10% from the viewpoint of economy.
It is suitable that the amount is about the same or more, preferably about 20 to 95%, more preferably about 25 to 90%. Here, the porosity refers to the ratio (%) of the void area to the area of the entire net.

The conductive net according to the present invention is preferably formed by tubular knitting. By constructing with the cylinder knitting, the tape (reference numeral 2 in FIG. 1) conventionally mounted on the upper and lower portions of the net is unnecessary, and the tape sewing process in the conductive net manufacturing process can be omitted, so that the manufacturing efficiency is improved. In addition, the manufacturing cost is low. Further, if such a conductive net is formed into a tubular knit, the work of mounting the conductive net around the flexible container can be performed by one worker, and the work efficiency is also improved.
When the conventional conductive net (FIG. 1) is attached to the container, it is necessary for two people to perform the attaching work because of its structure. That is, one person holds one of the strings (reference numeral 3 in FIG. 1) for attaching the conductive net, and the other holds the string and wraps the conductive net around the flexible container, and finally ties both ends. It was matched. However, since the conductive net of the present invention has elasticity, it is possible to repeat the operation of covering the conductive net on the flexible container and gradually extending a part of the conductive net downward. Thereby, even one person can cover the conductive container with the flexible container.

In a preferred embodiment of the conductive net of the present invention, (a) a yarn in which polyurethane-based elastic fiber is coated with non-elastic fiber, preferably double-covered,
(B) A conductive net having a conductive fiber or a moisturizing fiber, preferably a conductive fiber is used. Nylon yarn or polyethylene terephthalate yarn is preferably used as the non-elastic fiber. Further, it is more preferable that the conductive net has a tubular knitting shape.

The conductive net according to the present invention can be produced by a known method. For example, there is a method for producing a net by using a yarn made of rubber elastic fiber, preferably a rubber elastic fiber yarn covered with an inelastic fiber, and a yarn made of conductive fiber or moisturizing fiber. To be In addition, using a thread covering rubber elastic fiber with conductive fiber or moisturizing fiber and inelastic fiber,
A method for producing a net is also included. Of the above two methods, the former method is more preferable. In the former method,
Rubber elastic fiber yarn covered with non-elastic fiber,
In particular, polyurethane-based elastic yarn coated with nylon yarn or polyethylene terephthalate yarn is commercially available, and the commercially available yarn can be used. However, in the latter method, it is necessary to first produce a covering thread of rubber elastic fiber. Therefore, in the latter method, the number of manufacturing steps is increased and, in general, the covering speed at the time of covering the yarn is slow, so that the manufacturing takes time. Therefore, the former method is more preferable from the viewpoint of manufacturing efficiency. Further, in the former method, a smaller amount of conductive fibers or moisturizing fibers is used as compared with the latter method,
It is also preferable from the economical point of view.

As a method for producing the net, an appropriate known method can be selected according to the form of the net. For example, tubular knitting, which is a suitable net form in the present invention, can be produced using a known knitting machine. Known knitting machines include a Russell machine. The Russell machine includes a single Russell machine and a double Russell machine. In the present invention, it is preferable to manufacture a tubular knitting machine with a double Russell machine. Specifically, using a rubber elastic fiber core as a loop yarn, which is covered with a non-elastic yarn, using a conductive fiber or a moisturizing fiber as an insertion yarn,
By using a double Russell machine, a double Russell knitting having two rows of parallel needles is formed, and by connecting the nets partially or entirely, a tubular knit can be formed.

The conductive net according to the present invention is not particularly limited as long as it is required to have conductivity, and may be used for any purpose. Above all, as described above, by covering the flexible container used for powder transportation,
It is preferable to use the conductive net according to the present invention for a flexible container for releasing static electricity generated during powder handling. In addition, the conductive net according to the present invention requires grounding when used, and it is more preferable that a ground wire is attached. That is, it is preferable that the conductive net according to the present invention is in direct contact with the ground, or that a ground wire is attached and the ground wire is in contact with the ground. An example of the usage of the conductive net according to the present invention is shown in FIG. FIG. 3 shows the operation of filling the flexible container with powder. As shown in FIG. 3, the conductive net according to the present invention is used by covering a flexible container, and static electricity generated by friction of powder or the like can be released to the ground through a ground wire.

[0055]

[Example 1] "Lycra" 470 dtex manufactured by Toray-Dupont Co., Ltd. was used as the elastic fiber, and a wooly nylon thread 78 dtex manufactured by Toray Industries, Inc. was drafted on the elastic fiber by a covering machine of SDR230 manufactured by Kataoka Machinery Co. 4.4, double twisting with a lower twist of 1100 times (S) / m and an upper twist of 950 times (Z) / m gave a rubber elastic yarn. Also, "Sandaron" 110 dtex manufactured by Nippon Silkworm Dyeing Co., Ltd. is used as the conductive fiber, and nylon 235 dte manufactured by Toray Industries, Inc. is used as a reinforcing yarn for the conductive fiber.
Three x yarns were drawn and aligned, and a double net Raschel machine was used to obtain a tubular mesh fabric having a mesh number of 90 and a course number of 32.

Example 2 A rubber elastic yarn was obtained under the same conditions as in Example 1, and a conductive fiber made of "Kevlar" yarn having a single yarn fineness of 1.65 dtex and a (original yarn fineness of 440 dtex) manufactured by Toray DuPont Co., Ltd. A fiber having a thickness of 5 μm and plated with copper around each single yarn was knitted without a reinforcing yarn of a conductive fiber to obtain a tubular net fabric having 90 meshes and 32 courses.

[Test Example] The mesh of Examples 1 and 2 is 3 m
It was cut into a length, filled with an organic powder with a ground wire attached, and the amount of electrostatic charge was measured. The results are shown in the table below. The unit of numerical values in the table is KV.

[0058]

[Table 1]

[0059]

EFFECT OF THE INVENTION The conductive net of the present invention is excellent in static electricity removing effect, as compared with the conventional conductive net, because it has excellent fitability to a flexible container due to the incorporation of stretchable elastic fibers. Therefore, the possibility of dust explosion due to static electricity generated during handling and transportation of powder can be significantly reduced. A net in the form of a cylinder knit also improves the work efficiency when the conductive net is attached to the flexible container, and eliminates the need for the tape attached by conventional sewing, which is economically preferable.

[Brief description of drawings]

FIG. 1 is a schematic view of a conductive net that has been conventionally used.

FIG. 2 is an enlarged schematic view of a part of a net portion.

FIG. 3 shows an example of usage of the conductive net according to the present invention.

[Explanation of symbols]

1 Net department 2 tapes 3 strings 4 knit leg 5 joints

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takemasa Uda             1-2 1-2 Sonoyama, Otsu City, Shiga Prefecture             -DEE Co., Ltd. F-term (reference) 4L002 AA05 AA06 AB02 AB04 AC00                       AC01 CB02 EA00 EA06 FA06                 5G067 AA33 AA51 BA01 CA02 DA02                       DA13

Claims (9)

[Claims] 1. A conductive net having a knitted leg portion having elasticity. 2. The following formula 1; Elongation of knitted leg (%) = {(L ₁ −L ₀ ) / L ₀ } × 100 [Equation 1] (where L ₀ is the length of the knitted leg before stretching) Length (cm), L ₁
Indicates the length (cm) of the knitted leg portion after stretching. ) The elongation of the knitted leg portion is 50% or more, and the conductive net according to claim 1. 3. The conductive net according to claim 1, which contains conductive fibers or moisturizing fibers. 4. The conductive fibers are selected from the group consisting of (a) fibers containing copper sulfide via cyano groups, (b) metal plated fibers and (c) carbon fibers. The conductive net according to claim 3, which is one or more fibers. 5. The conductive net according to claim 4, wherein the metal-plated fiber is a metal-plated polyparaphenylene terephthalamide fiber. 6. The conductive net according to claim 3, further comprising a fiber having rubber elasticity. 7. The conductive net according to claim 6, wherein the fiber having rubber elasticity is a polyurethane elastic fiber or a polybutylene terephthalate fiber. 8. The conductive net according to claim 6, wherein the fiber having rubber elasticity is covered with a non-elastic yarn. 9. A conductive elastic fiber and a polyurethane elastic fiber covered with a non-elastic yarn, and having the following mathematical formula 1; elongation of knitted leg (%) = {(L ₁ −L ₀ ) / L ₀ } × 100 [Formula 1] (In the formula, L ₀ is the length (cm) of the knitted leg portion before stretching, L ₁
Indicates the length (cm) of the knitted leg portion after stretching. ) The conductive net, wherein the elongation of the knitted leg portion is 50% or more.