JP2014070305A - Woven fabric for dust-free clothing and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a woven fabric for dust-free clothing excellent in low dust producing properties and antistatic properties and having a soft feeling, and to provide a method for producing the same.SOLUTION: The woven fabric 1 includes a polyester filament and a conductive filament as constituent fibers, and a polymer is formed on the surface of the constituent fibers by reacting a bi-functional unsaturated carboxylic ester including a polyalkylene glycol. By satisfying the following requirements (1) to (3), it is possible to produce a woven fabric for dust-free clothing: (1) the frictional electrification voltage according to JIS-L-1094 in an environment of 20°C and 40%RH is 1000 V or lower; (2) the dusting amount of dust having a particle size of 0.3 μm or more according to JIS-B9923 (tumbling method) is 50/ft100 cmor less; and (3) the bending characteristics B according to the KES method is 0.1 gf cm/cm or less.

Description

  The present invention relates to a polyester dust-free garment, and relates to a dust-free garment having a low dusting property and an antistatic property and having a soft texture.

  In recent years, in the fields of semiconductors, electronic components, precision equipment, pharmaceuticals, medical equipment, etc. (hereinafter abbreviated as semiconductors, etc.), the influence of the work environment on product yield, quality and reliability has been increasing. ing. In particular, the influence of fine dust and static electricity on the yield, quality, and reliability of products is increasing, and the work environment is being further cleaned.

  As part of the above-mentioned cleanup of the work environment, development of fabrics used for dust-free clothing that suppresses dust and static electricity generated from the human body and clothes of workers has been promoted. As the performance required for the dust-free garment, there are largely antistatic, dustproof and wearing comfort. As a constituent fiber of the woven fabric, a polyester filament is often used from the viewpoints of form stability, strength, washing durability and the like. However, a dust-free garment made of only polyester filaments is particularly insufficient in antistatic properties.

  Regarding antistatic properties, fabrics made of polyester filaments and conductive filaments are known. In the woven fabric, conductive filaments are used as constituent fibers, so that electric charges generated by friction are released into the air by corona discharge, and the antistatic property is improved. However, since the conductive filament has a discharge start voltage of about 1000 V, the woven fabric cannot have a friction band voltage of 1000 V or less according to the JISL 1094 method. In the field of manufacturing semiconductors and the like, a dustless garment having a frictional voltage of 1000 V or less has been recently demanded, and the woven fabric does not sufficiently meet this demand.

  Concerning dustproofness, the source of dust generated from workers wearing dust-free clothing is leaked dust that leaks from clothing openings such as collars due to increased internal pressure of clothing, worn under the human body and dust-free clothing. Dust generation from clothing is roughly classified into transmission dust passing through the gaps in the fabric structure of the dust-free garment and material dust generation generated from the dust-free garment itself. Among these, it is known that leakage dust can be reduced by preventing the increase of the internal pressure of the clothes and designing the woven structure and the clothes so that the clothes opening is narrowed down. As for the permeated dust, it is known that the permeated dust can be reduced (dust collecting property) by increasing the density of the fabric structure or coating the surface of the fabric. Regarding material dusting, it is known that material dusting can be reduced (low dusting property) by using long fibers such as polyester filaments as constituent fibers (see, for example, Non-Patent Document 1).

  Accordingly, in order to further improve the antistatic, dustproof and wearing comfort of the dust-free garment, a woven fabric comprising polyester filaments and conductive filaments, the woven fabric having various processings proposed. Has been.

  As the woven fabric, there is known a woven fabric for a dust-proof garment including a polyester filament and a conductive filament as a constituent fiber and containing a pyridine-based antibacterial agent (for example, see Patent Document 1). According to the woven fabric, a dust-free garment excellent in low dust generation and antibacterial properties can be obtained.

  A woven fabric having polyester filaments and conductive filaments as constituent fibers, in which an antistatic agent is fixed to the fiber surface using a melamine resin-based resin or urethane-based resin as a binder is known (for example, Patent Document 2). reference.). According to the woven fabric, it is possible to obtain a dust-free garment having excellent antistatic properties and dust collection properties.

  A woven fabric having polyester filaments and conductive filaments as constituent fibers and having a synthetic resin film mainly composed of polyurethane on at least one side of the woven fabric is known (for example, see Patent Document 3). According to the woven fabric, it is possible to obtain a dust-free garment having excellent antistatic properties and low dust generation.

  A woven fabric comprising polyester filaments and conductive filaments, and a polymer obtained by reacting vinyl carboxylic acid and / or vinyl sulfonic acid and a bifunctional unsaturated carboxylic acid ester containing a specific polyalkylene glycol on the fiber surface. A woven fabric is known (see, for example, Patent Document 4). According to the woven fabric, it is possible to obtain a dust-free garment having excellent antistatic properties and low dust generation.

JP 2000-290874 A JP 2003-171844 A JP 2003-247171 A JP 2003-227016 A

The Japan Society for Textile Science, “Third Edition Textile Handbook”, Maruzen Co., Ltd., December 15, 2004, p. 546-549

  However, since the fabric of Patent Document 1 is not formed with a polymer that imparts antistatic properties to the surface of the fabric, the antistatic property is insufficient as a fabric for dustless clothing required in the field of semiconductors and the like. There is a problem. The fabric of Patent Document 2 is excellent in dust collection with respect to dust resistance, but has a problem that dust is generated by the binder component fixed to the fiber surface serving as a dust generation source. The fabrics of Patent Documents 3 and 4 are excellent in antistatic properties and low dust generation properties, but because the constituent fibers are fixed by the polymer formed on the entire fabric, the texture is hard, and the dust-free garment including the fabric is There is a problem of poor wearing comfort.

  From the above, even if a polymer that imparts antistatic properties is formed on a woven fabric comprising polyester filaments and conductive filaments for the purpose of improving antistatic properties, the woven fabric has a problem that the texture becomes hard. In addition, there is a possibility that the polymer itself becomes a dust generation source and the generation of material dust increases.

  An object of the present invention is to solve the above-mentioned conventional problems, to provide a dust-free garment having excellent dust generation and antistatic properties, and having a soft texture, and a method for producing the same. .

  The present inventor uses a high-pressure water stream on a woven fabric in which a polymer obtained by reacting a bifunctional unsaturated carboxylic acid ester containing a polyalkylene glycol is formed on the surface of the constituent fiber, including a polyester filament and a conductive filament. By performing the spraying process, it was found that the woven fabric was excellent in low dust generation and antistatic properties and had a flexible texture, and the present invention was completed. That is, the gist of the present invention is as follows.

(I) A woven fabric in which a polymer obtained by reacting a bifunctional unsaturated carboxylic acid ester containing a polyalkylene glycol is formed on the surface of the constituent fiber, which includes a polyester filament and a conductive filament. A dust-free garment characterized by satisfying the requirements of 1) to (3).
(1) The friction voltage of the JIS L 1094 method in an environment of 20 ° C. and 40% RH is 1000 V or less.
(2) The amount of dust generated with a particle size of 0.3 μm or more according to JIS B9923 (tumbling method) is 50 / ft ³ · 100 cm ² or less.
(3) The bending property B by the KES method is 0.1 gf · cm ² / cm or less.
(II) A jet treatment using a high-pressure water stream on a fabric in which a polyester filament and a conductive filament are included as constituent fibers and a polymer formed by reacting a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol on the constituent fiber surface is formed. The method for producing a dustless garment as described in (I) above, wherein:
(III) A dust-free garment using the dust-free garment described in (I) above.

  The fabric for dustless clothing of the present invention includes a polyester filament and a conductive filament as constituent fibers, and a fabric formed by reacting a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol on the surface of the constituent fibers. In addition, it is obtained by performing an injection process using a high-pressure water flow. As a result, the woven fabric has excellent low dust generation and antistatic properties, and can have a flexible texture. Therefore, the fabric is excellent in wearing comfort and is required for a clean production site required for manufacturing semiconductors and the like. A dust-free garment that can respond to the environment can be obtained.

It is a cross-sectional schematic diagram which shows an example of the composite shape in the cross section of the electroconductive filament used for this invention. It is the side schematic diagram which shows an example of the apparatus used for the injection treatment process by the high pressure water flow in the manufacturing method of this invention. It is the plane schematic which shows an example of the arrangement | sequence of the injection hole in the injection nozzle which injects a high pressure water flow among the apparatuses used for the injection process by the high pressure water flow in the manufacturing method of this invention. It is a plane schematic diagram explaining the ratio which the sum total of the diameter of all the injection holes arranged in the fabric width direction with respect to the width direction length of the fabric of the injection process by the high-pressure water flow in the manufacturing method of the present invention occupies.

  The fabric for dust-free garments of the present invention contains polyester filaments as constituent fibers.

  In the present invention, the polyester constituting the polyester filament is not particularly limited, but polyethylene terephthalate (hereinafter sometimes abbreviated as PET), polybutylene terephthalate (hereinafter sometimes abbreviated as PBT), polypropylene terephthalate, Polylactic acid or the like can be used. Among these, it is preferable to use PET in which the ethylene terephthalate unit is 95 mol% or more of all repeating units. The polyester may be a polybasic acid, a polyhydric alcohol, or a copolyester used in two or more types of both the polybasic acid and the polyhydric alcohol.

  In the present invention, the single filament fineness of the polyester filament is preferably in the range of 0.1 to 3.0 dtex. When the single yarn fineness is less than 0.1 dtex, the obtained dustless woven fabric is less likely to have tight waists and easily cling to the body when worn. On the other hand, when the single yarn fineness exceeds 3.0 dtex, the resulting dust-free woven fabric tends to have a hard texture.

  In the present invention, the cross-sectional shape of the polyester filament is not particularly limited. Further, the polyester filament may contain titanium dioxide, silicon dioxide, pigment, and the like.

  In the present invention, it is preferable that a plurality of polyester filaments are converged to form a multifilament. The total fineness of the multifilament is preferably in the range of 50 to 150 dtex. When the fineness is less than 50 dtex, the resulting woven fabric containing multifilaments as constituent fibers tends to be inferior in strength. On the other hand, when the fineness exceeds 150 dtex, the texture of the resulting multifilament as a constituent fiber tends to be hard. The form of the multifilament may be a raw yarn or a processed yarn subjected to false twisting or actual twisting.

  The dustless garment of the present invention includes conductive filaments as constituent fibers together with polyester filaments.

  In the present invention, the conductive filament is a fiber having antistatic properties due to a neutralizing action or electric conduction by corona discharge. As the conductive filament, a filament composed of a conductive polymer is preferable. Here, the conductive polymer is a polymer provided with conductivity by blending conductive fine particles with the filament-forming polymer used to form the filament.

  The conductive filament composed of a conductive polymer may be a filament formed of a single conductive polymer, but does not include a conductive polymer portion formed of a conductive polymer and conductive fine particles. A filament having a composite cross-sectional shape composed of a non-conductive polymer portion formed of a non-conductive polymer is preferable. By making the filament having a composite cross-sectional shape, it becomes easy to obtain excellent yarn quality performance such as high elongation properties and spinnability in addition to conductivity.

  As the filament-forming polymer used for the conductive polymer and the non-conductive polymer, polyester and polyamide are preferable. Polyester is preferable from the viewpoint of heat resistance, and PET or PBT is preferable when the polyester is used.

  The filament-forming polymer used for the conductive polymer is more preferably PBT. Since the PBT resin is a resin having high crystallinity, the alignment defects of the conductive fine particles in the conductive polymer can be reduced, and the performance as the conductive filament can be obtained efficiently. Furthermore, it is particularly preferable that the filament-forming polymer used for the conductive polymer contains isophthalic acid and / or adipic acid as a copolymerization component. Thereby, the compatibility of the filament-forming polymer and the conductive fine particles can be improved, the content of the conductive fine particles can be increased, and the conductive filament can have excellent conductive performance. The amount of copolymerization when isophthalic acid and / or adipic acid is copolymerized is preferably 10 to 50 mol% with respect to all the constituent components of the filament-forming polymer used for the conductive polymer.

  Examples of the conductive fine particles contained in the conductive polymer include carbon black, metal powder, metal compounds such as copper sulfide, zinc sulfide, and copper iodide. Among these, carbon black is preferably used.

  The content of the conductive fine particles may be appropriately selected depending on the type of conductive fine particles, the conductive performance, the particle diameter, the ability to form a chain of particles, and the characteristics of the polymer to be used. %, Preferably 10 to 40% by mass. When the content is less than 5% by mass, the resulting woven fabric tends to have insufficient antistatic properties. Moreover, when this content exceeds 50 mass%, dispersion | distribution in the conductive polymer of electroconductive fine particles tends to become difficult.

  Furthermore, in the conductive polymer, a dispersant such as waxes, polyalkylene oxides, various surfactants, organic electrolytes, an antioxidant, an ultraviolet absorber, etc., as long as the effects of the present invention are not impaired. Stabilizers, colorants, pigments, fluidity improvers, and other additives can also be added.

  The nonconductive polymer that can be used for the conductive filament is not particularly limited, but may be selected from the viewpoint of preventing peeling between the conductive polymer portion and the nonconductive polymer portion. For example, when the conductive polymer is PBT or copolymerized PBT, it is preferable that the nonconductive polymer is PET or PBT so as to improve compatibility. Also, non-conductive polymers may be copolymerized with a third component such as isophthalic acid, and additives such as matting agents, colorants, pigments, stabilizers, antistatic agents, etc., as long as the effects are not impaired. May be added.

  The composite ratio of the non-conductive polymer part and the conductive polymer part is not particularly limited, but the non-conductive polymer part is preferably 60 to 90% by mass and the conductive polymer part is preferably 40 to 10% by mass. More preferably, the non-conductive polymer part is 70 to 85% by mass and the conductive polymer part is 30 to 15% by mass. When the composite ratio of the conductive polymer portion is less than 10% by mass, the conductive performance of the obtained conductive filament tends to be inferior, and the resulting fabric is difficult to obtain desired antistatic properties. On the other hand, when the composite ratio of the conductive polymer part exceeds 40% by mass, the obtained filamentous properties such as the strength and elongation characteristics of the conductive filament are likely to be inferior.

  FIG. 1 is a schematic cross-sectional view showing an example of a composite shape in a cross-section of a conductive filament used in the present invention. In the present invention, when the conductive filament is a filament having a composite cross-sectional shape composed of a conductive polymer portion and a non-conductive polymer portion, the composite shape in the cross section of the filament is particularly limited. is not. However, from the viewpoint of antistatic properties and low dust generation properties, the composite shape has a conductive polymer portion in the nonconductive polymer portion, and the conductive polymer portion is partially exposed on the fiber surface. Those are preferred. As an example, the composite shape shown in FIGS.

The conductivity of the conductive filament is preferably in the range of 1 × 10 ⁴ to 1 × 10 ⁹ Ω / cm, more preferably 1 × 10 ⁴ to 1 × 10 ⁸ Ω / cm, and more preferably 1 × 10 ⁴ to 1 × 10 ⁴ Ω / cm. 1 × 10 ⁷ Ω / cm is more preferable. When the electrical resistance value is less than 1 × 10 ⁴ Ω / cm, it is necessary to contain a large amount of conductive fine particles in the conductive polymer, and the resulting cloth for dust-free garments tends to generate a large amount of dust. On the other hand, when the electrical resistance value exceeds 10 ⁹ Ω / cm, the resulting dust-free garment fabric is unlikely to have sufficient antistatic properties. When it is set to 1 × 10 ⁴ to 1 × 10 ⁷ Ω / cm, it is more preferable in that the low dust generation property and the antistatic property of the obtained dust-free garment fabric can be easily achieved.

  Here, the electrical resistance value is measured according to the AATCC76 method. First, one conductive conjugate fiber is cut in the length direction, and 10 samples are collected. Apply keratin cream to the surfaces of both ends of the sample, connect this surface part to a metal terminal, apply a direct current of 50 V to measure the current value, calculate the electrical resistance value according to the following formula (a), The arithmetic average value of the calculated electric resistance values of the ten samples is taken as the electric resistance value.

E: Voltage (V) I: Measurement current (A) L: Measurement length (cm)

  The conductive filament may be a monofilament composed of one filament, or 2-10 bundles may be multifilaments. The fineness should just be the total fineness of a monofilament or a multifilament being 10.0-50.0 decitex.

  The conductive filaments may be woven as monofilaments or multifilaments made of only conductive filaments when weaving the dustless woven fabric, or may be woven by mixing with other filaments. The method for mixing fibers is not particularly limited, but it is preferable to use a combustible yarn from the viewpoints of low dust generation and weaving properties.

  The fabric structure of the fabric for dust-free garments of the present invention may be flat, twill, satsuko, and the like and their changed structures. The monofilament, multifilament or twisted yarn containing the conductive filament is preferably arranged at intervals of 2 to 30 mm as warps and wefts in the fabric structure, and is preferably arranged at intervals of 2 to 10 mm. Is more preferable.

  In the dustless garment of the present invention, a polymer obtained by reacting a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol is formed on the surface of the constituent fiber of the woven fabric containing polyester filaments and conductive filaments. is necessary. By forming the polymer, the frictional band voltage of the woven or knitted fabric for dust-free garments described later can be set to 1000 V or less.

  The difunctional unsaturated carboxylic acid ester containing polyalkylene glycol is a diacrylate or dimethacrylate containing polyethylene glycol or polypropylene glycol represented by the following general formula (1) from the viewpoint of giving excellent antistatic properties to the fabric for dustless clothing. Or epoxy diacrylate and epoxy dimethacrylate containing polyethylene glycol or polypropylene glycol represented by the following general formula (2). In addition, as for the molecular weight of polyethyleneglycol and polypropyleneglycol, 100-1000 are preferable.

General formula (1):

General formula (2):

In general formulas (1) and (2), n represents an integer of 1 to 23, and R represents H or CH ₃ .

  The adhesion amount of the polymer is preferably 0.5 to 30% by mass and more preferably 1 to 20% by mass with respect to the total mass of the woven or knitted fabric for dustless garment of the present invention. When the adhesion amount is less than 1% by mass, the obtained dust-free garment fabric tends to be difficult to obtain a desired antistatic property. On the other hand, when the amount of adhesion exceeds 30% by mass, the resulting dust-free woven fabric tends to have a hard texture.

  In the dustless garment of the present invention, the friction band voltage of the JIS L 1094 method in an environment of 20 ° C. and 40% RH needs to be 1000 V or less, and preferably 500 V or less. When the frictional voltage exceeds 1000V, in addition to being easy to adsorb dust in the air when worn as a dust-free garment, the dust-free garment tends to cling to the body, causing discomfort, and manufacturing sites for semiconductors, etc. It cannot meet the demand for anti-static performance. By setting the friction withstand voltage to 500 V or less, the dustless garment made of the woven fabric is preferable because it can be used at a manufacturing site where the antistatic requirement is particularly severe.

The dust-free woven fabric of the present invention is required to have a dust generation amount of 0.3 μm or more according to JIS B9923 (tumbling method) of 50 pieces / ft ³ · 100 cm ² or less, and 30 pieces / ft ³ -It is preferable that it is 100 cm < ² > or less. When the amount of dust generation exceeds 50 / ft ³ · 100 cm ² , the environment of the manufacturing site for semiconductors and the like is contaminated and productivity is lowered. When the dust generation amount is 30 pieces / ft ³ · 100 cm ² or less, the dust-free garment made of the woven fabric is preferable because it can be used in a production site where dust generation requirements are particularly severe.

The dust-free garment of the present invention needs to have a bending property B by the KES method, which is an index representing the flexibility of the woven fabric, of 0.1 gf · cm ² / cm or less. The bending property B is determined by using a KES-FB2 pure bending tester, fixing one end of the sample piece (sample length 10 mm, sample width 25 mm) to the mounting position, and moving the other end to a constant curvature (maximum curvature ± 2 0.5 cm ⁻¹ ), a pure bending test is performed, a bending hysteresis curve is created, and a bending stiffness B (gf · cm ² ) per unit length is obtained. The bending characteristic B of the present invention is an average value in the vertical direction and the horizontal direction. When the bending property B exceeds 0.1 gf · cm ² / cm, the resulting fabric for dust-free garments has a firm texture, and when it is made dust-free, it is inferior in wearing comfort.

  The dustless garment of the present invention is preferably made of the dustless garment of the present invention, and more preferably only the woven fabric. The fabric has excellent low dust generation and antistatic properties, and can have a soft texture, so it is excellent in wearing comfort and is compatible with the clean environment required at the manufacturing site of semiconductors and the like. You can get a dust-free garment that you can do.

  Next, a method for producing a dustless woven fabric of the present invention (hereinafter sometimes abbreviated as the production method of the present invention) will be described.

  In the production method of the present invention, it is necessary to use a fabric having the above-described polyester filament and conductive filament as constituent fibers.

  The woven fabric can be woven by a known method using an air jet loom, a water jet loom, a rapier loom or the like using the polyester filament and the conductive filament. The texture of the woven fabric is preferably flat, twill, satin, or the like and its changed structure. The conductive filaments are preferably arranged at intervals of 2 to 30 mm on warps and wefts, and more preferably at intervals of 2 to 10 mm. The conductive filament may be a single yarn or a mixed yarn with a polyester synthetic fiber. The woven fabric including the polyester filament and the conductive filament as a constituent fiber may be subjected to desizing refining, presetting, and dyeing by an ordinary method.

  In the production method of the present invention, a polymer obtained by reacting a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol on the surface of a constituent fiber of a woven fabric having the polyester filament and the conductive filament as a constituent fiber (hereinafter referred to as an antistatic polymer). It is necessary to be formed. Hereinafter, an example is given and demonstrated about the method of forming an antistatic polymer.

  In the method for forming the antistatic polymer, first, an aqueous solution containing a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol is prepared. The aqueous solution may contain a polymerization initiator in order to increase the polymerization efficiency of the bifunctional unsaturated carboxylic acid ester.

  Examples of the polymerization initiator include inorganic polymerization initiators such as ammonium persulfate, potassium persulfate, cerium ammonium nitrate, and hydrogen peroxide, 2,2′-azobis (2-amidinopropane) dihydrochloride, 2,2 Examples thereof include radical initiators such as organic radical initiators such as' -azobis (N, N'-dimethyleneisobutyramide) dihydrochloride and 2- (carbamoylazo) isobutyronitrile.

  In order to further increase the polymerization efficiency, it is preferable to use a peroxide and a reducing substance in combination as the polymerization initiator, and so-called redox initiators can also be used. Examples of the peroxide include ammonium persulfate and potassium persulfate, and examples of the reducing substance include a reaction product of sodium sulfoxylate and formalin, hydrosulfite, and the like.

  As a usage-amount of a polymerization initiator, it is preferable to set it as the range of 0.1-15.0 mass% with respect to the mass of the said bifunctional unsaturated carboxylic acid ester.

  Furthermore, a polymerization inhibitor may be contained in the aqueous solution containing the bifunctional unsaturated carboxylic acid ester. By using a polymerization inhibitor in combination, polymerization in a low temperature range can be suppressed, and it becomes easy to obtain an antistatic polymer having a desired degree of polymerization. Polymerization inhibitors include quinones such as benzoquinone, hydroquinone and methoxyphenol, polyoxy compounds such as tert-butylcatechol, organic sulfur compounds such as sodium dimethyldithiocarbamate and diethylhydroxylamine, nitro compounds, diethylhydroxylamine and isopropylhydroxyl. And amino compounds such as amines. As a usage-amount of a polymerization inhibitor, it is preferable to set it as the range of 0.01-2.00 mass% with respect to the mass of the said bifunctional unsaturated carboxylic acid ester.

  After adjusting the above aqueous solution, the aqueous solution is applied to a woven fabric having the above-described polyester filament and conductive filament as constituent fibers. A method for applying the aqueous solution is not particularly limited, and a known method such as a padding method, a spray method, a kiss roll coater method, or a slit coater method can be appropriately used. And the said textile fabric to which this aqueous solution was provided may give preliminary drying, such as air drying or heating suitably, according to the means to react the said bifunctional unsaturated carboxylic acid ester mentioned later.

  Arbitrary means can be employ | adopted as a means to make the said bifunctional unsaturated carboxylic acid ester provided to textiles react. For example, low-temperature plasma treatment, dry heat treatment, steam heat treatment, cold batch treatment, or ultraviolet treatment means can be suitably employed. Among these, low temperature plasma treatment and steam heat treatment are preferable from the viewpoint of polymerization efficiency and stability, and steam heat treatment is more preferable in terms of cost.

  Examples of the steam heat treatment include a treatment with normal pressure steam and a treatment with high pressure steam. From the viewpoint of cost, it is preferable to employ a treatment using normal pressure steam. As temperature of a steam heat processing, 80-180 degreeC is preferable and 98-150 degreeC is more preferable. The steam heat treatment time is preferably 1 to 20 minutes.

  After forming the antistatic polymer on the fabric surface, it is preferable to perform soaping to remove unreacted substances present on the fabric surface. When soaping is not performed, the obtained dust-free garment is likely to be discolored due to elution of the remaining unreacted material, and the problem of a decrease in dyeing fastness is likely to occur.

  As the apparatus for performing the soaping, a known apparatus such as a continuous apparatus such as an open soaper or a batch apparatus such as a wince or a liquid dyeing machine can be used. In order to sufficiently remove unreacted substances existing on the surface of the fabric, the temperature at which the soaping is performed is preferably 60 to 100 ° C., and the time for the soaping is preferably 1 to 60 minutes. In the case of soaping, it is preferable to use a surfactant in combination from the viewpoint of increasing cleaning efficiency. After the soaping, the fabric is preferably dried with a tenter or the like.

  In the production method of the present invention, it is necessary to perform a jet treatment using a high-pressure water stream on a woven fabric that includes the above-described polyester filament and conductive filament as constituent fibers and the antistatic polymer is formed on the surface of the constituent fibers. .

  The technique of injecting a high-pressure water flow onto the woven fabric is a technique for improving the design of the woven fabric by disturbing the arrangement of fibers constituting the woven fabric. On the other hand, the present inventors unexpectedly remove excess polymer fixed between fibers constituting the fabric by spraying the high-pressure water stream onto the fabric coated with a specific antistatic polymer. It has been found that the conventional design improvement of reducing the dust generated from the fabric and softening the fabric has a different working effect.

  In other words, it is possible to reduce dust generated from the fabric and to make the fabric flexible without lowering the antistatic property by performing a jet treatment with a high-pressure water flow on the fabric formed of the antistatic polymer. Thus, the antistatic property, dust generation property and texture desired in the present invention can be obtained.

  The adhesion amount of the antistatic polymer after the injection treatment cannot be accurately measured, but the mass of the fabric before and after the injection treatment, and the solid content of the liquid used for the injection treatment recovered after the injection treatment Is estimated to be about half of the adhesion amount before the jet treatment by the high-pressure water flow.

  In the case where the antistatic polymer is formed on the woven fabric containing the polyester filament and the conductive filament as constituent fibers so that the adhesion amount is low, the antistatic property, dust generation property and I can't get a texture. The following can be guessed as the reason.

  In the woven fabric obtained as described above, the thickness of the antistatic polymer is small, but excess polymer exists between the constituent fibers of the woven fabric. Then, the fabric becomes inferior in antistatic property due to the decrease in the thickness of the antistatic polymer, and becomes inferior in dust generation due to the surplus polymer serving as a dust generation source. It can be presumed that the texture becomes hard when the constituent fibers are fixed to each other.

  As described above, according to the manufacturing method of the present invention, by performing the jetting process, it is possible to selectively remove excess polymer or the like adhering between the fibers constituting the textile, and the textiles subjected to the jetting process. Can be presumed to be excellent in low dust generation and texture while maintaining excellent antistatic properties even when the amount of polymer attached decreases. As a result of examining low dust generation properties, it has been found that the oligomers derived from the constituent fibers in addition to the excess polymer can be removed by the injection treatment. Therefore, according to the production method of the present invention, since the oligomer derived from the constituent fibers can be removed in addition to the surplus polymer, excellent low dust generation can be obtained.

  FIG. 2 is a schematic side view showing an example of an apparatus used for an injection process using a high-pressure water flow in the production method of the present invention. FIG. 3 is a schematic plan view showing an example of the arrangement of the injection holes in the injection nozzle that injects the high-pressure water flow among the devices used in the injection treatment process using the high-pressure water flow in the manufacturing method of the present invention. As shown in FIGS. 2 and 3, the fabric 1 is supplied to the high-pressure water jet treatment zone by the feed roll 2. The high-pressure water jet nozzle 3 is provided below the traveling fabric 1 in the high-pressure water jet treatment zone. The high-pressure water jet nozzle 3 is provided with a plurality of jet holes 5 and jets a high-pressure water stream from the jet holes 5 toward the traveling fabric 1. And the textile fabric 1 to which the liquid used for the injection process by a high pressure water flow adheres is squeezed by the deli berry roll 4, and is discharged | emitted from a high pressure water flow injection process zone.

  The liquid used for the jet treatment by the high-pressure water stream can be room temperature water or warm water, and may contain a surfactant, an antistatic agent, various finishing agents, and the like. The jet shape of the high-pressure water flow includes a cone shape, a hollow cone shape, a fan shape, a column shape, and the like, and since the energy is relatively large when the column shape is used, the fabric for dustless clothing having a desired low dust generation property and texture. Becomes easier to obtain.

  When the shape of the high-pressure water jet is columnar, the injection hole 5 is preferably a fine hole having a hole diameter of 0.05 to 1.0 mm, and more preferably 0.1 to 0.4 mm. A smaller hole diameter of the injection hole 5 is advantageous in that a uniform treatment can be performed, but if it is less than 0.05 mm, the frequency of the injection hole 5 being clogged tends to increase. On the other hand, when the hole diameter exceeds 1.0 mm, the high-pressure water flow is too thick and it is difficult to obtain a uniform treatment effect.

  The high-pressure water jet nozzle 3 is preferable in that the spray holes 5 are arranged at 5 to 30 / cm in the width direction of the fabric 1 in that it is easy to perform the jet treatment without causing unevenness in the width direction of the fabric 1. . The injection nozzle 3 may be configured such that the injection holes 5 are arranged in a line in the width direction of the fabric 1 to form an injection hole array. As shown in FIG. 3, the spray nozzle 3 may be configured such that a plurality of spray hole arrays in which the spray holes 5 are disposed in the width direction of the fabric 1 are disposed in the warp direction of the fabric 1. As shown in FIG. 3, when a plurality of injection hole rows are arranged in the warp direction of the fabric 1, the arrangement of the injection holes 5 is arranged for each row so that the injection hole 5 can be efficiently processed in the width direction of the fabric 1. It is preferable to arrange it so as to be slightly shifted in the direction. By arranging so as to be slightly shifted, unevenness in the spraying process is less likely to occur in the width direction of the fabric 1.

  FIG. 4 is a schematic plan view for explaining the ratio of the sum of the diameters of all the injection holes arranged in the fabric width direction to the length in the fabric width direction in the jet treatment step using the high-pressure water flow in the production method of the present invention. It is. In the injection treatment step, the ratio of the total sum (mm) of the diameters of the injection holes 5 arranged in the width direction of the fabric 1 to the length (mm) in the width direction of the fabric 1 is preferably 70% or more. Here, as shown in FIG. 4, in the injection nozzle 3, a plurality of injection hole rows are arranged in the warp direction of the fabric 1, and the arrangement of the injection holes 5 is slightly shifted in the width direction of the fabric 1 for each row. When arranged, it is assumed that the injection holes 5 arranged in each row are arranged in a row with the position in the width direction of the fabric 1 fixed, and the sum of the hole diameters is calculated. By setting the ratio to 70% or more, it becomes easy to perform the spraying process in the width direction of the fabric 1 without unevenness, and it becomes easy to obtain a dust-free clothing fabric having a desired low dust generation property and texture.

The flow rate of the high-pressure water flow [= injected water amount (m ³ / second) / total area of the injection holes (m ² )] is preferably ^{2 to} 300 m / second. When the flow velocity is less than 2 m / sec, the jet treatment with the high-pressure water flow tends to be insufficient due to insufficient energy, and it becomes difficult to obtain a dust-free garment having a desired low dust generation property and texture. On the other hand, when the flow rate exceeds 300 m / sec, the energy is too large, and the filaments constituting the fabric are easily cut or holes are easily formed in the fabric.

  It is preferable that the pressure (liquid pressure) of the liquid used for the injection process by a high-pressure water flow is 0.4 to 15 MPa. When the hydraulic pressure is less than 0.4 MPa, the effect of the jet treatment using the high-pressure water flow tends to be insufficient due to insufficient energy, and it becomes difficult to obtain a dust-free garment having a desired low dust generation property and texture. On the other hand, when the hydraulic pressure exceeds 15 MPa, the energy is too large, and it is easy to cut the filament constituting the fabric, or to easily make a hole in the fabric.

  The distance between the spray nozzle 3 and the fabric 1 when the high-pressure water stream is sprayed on the fabric surface is preferably 0.5 to 15 cm. When the interval is less than 0.5 cm, the fabric tends to come into contact with the spray nozzle during the treatment, and the commercial value of the fabric for dust-free garments tends to be lowered, such as the high-pressure water stream is likely to remain in the form of meridians. When the distance exceeds 15 cm, the high-pressure water flow is likely to be disturbed due to static electricity caused by air resistance or friction with air, and energy loss is likely to increase. In addition, the treatment tends to be non-uniform.

  The traveling speed of the fabric 1 is preferably 1 to 50 m / min, and more preferably 3 to 25 m / min. In the apparatus shown in FIG. 2, it is preferable to set and process so that the surface speed of the feed roll 2 and the delivery roll 4 may become the same. When the speed is less than 1 m / min, the processing speed is too slow and the productivity is likely to be lowered, and the filaments constituting the fabric are easily cut or the fabric 1 is likely to be perforated. When the speed exceeds 50 m / min, the time during which the high-pressure water stream acts on the fabric 1 is shortened, and the jet treatment with the high-pressure water stream tends to be insufficient, and the fabric for dustless clothing having the desired low dust generation and texture. Is difficult to obtain.

  In the production method of the present invention, a dust-free woven fabric can be obtained by drying after carrying out the spraying treatment with a high-pressure water stream, but it may be finally set for stretching.

  Hereinafter, the present invention will be specifically described with reference to Examples and Comparative Examples. In addition, the evaluation method of antistatic property, dust generation property, and texture in Examples and Comparative Examples is as follows.

1. Antistatic (friction voltage)
Under an environment of 20 ° C. and 40% RH, the frictional voltage was determined according to JIS L 1094: 1997, and a voltage of 1000 V or less was accepted.

2. Dusting JIS B 9923: according to the 1997 (tumbling), using light scattering automatic particle coefficient unit, the particle size was determined 0.3μm or more particle concentration (number ^/ ft 3 · 100cm ^2).

3. Texture (Bending characteristics B by KES method)
Using a KES-FB2 pure bending tester, fix one end of the sample piece (sample length 10 mm, sample width 25 mm) at the mounting position, and move the other end with a constant curvature (maximum curvature ± 2.5 cm ⁻¹ ) A pure bending test was performed, a bending hysteresis curve was prepared, and a bending rigidity B (gf · cm ² ) per unit length was obtained.

Example 1
<Constituent fiber>
A PET multifilament yarn (84 dtex / 72 filament) in which ethylene terephthalate units are 95 mol% or more of all repeating units is used as the polyester filament, and a polyester conductive multifilament yarn (Unitika Trading Co., Ltd.) is used as the conductive filament. Manufactured, trade name: Megana (E5), 28 dtex / 2 filament) and one PET multifilament raw yarn were used as a twisted yarn of 300 T / M.

<Textile structure>
As a warp, one of the above-mentioned combustible yarns is arranged for 35 of the above-mentioned PET multifilament raw yarns, and as a weft, one of the above-mentioned combustible yarns is arranged for 23 of the above-mentioned PET multifilament raw yarns, and a warp density of 193 A 2/2 twill woven fabric of /2.54 cm and a weft density of 116 yarns / 2.54 cm was woven.

  The twill fabric was scoured by a normal method and pre-set at 190 ° C. for 30 seconds with a tenter to obtain an off-white twill fabric. The twill fabric was impregnated with the aqueous solution shown in the following prescription 1, and then a saturated vapor treatment at 103 ° C. was performed for 10 minutes without drying, with a squeezing rate of 30% by mass and a squeeze adhesion amount of 4.5% by mass. .

<Prescription 1>

: 150 g / l
(Manufactured by Shin-Nakamura Chemical Co., Ltd., n = 23 polyethylene glycol dimethacrylate in the formula)
Ammonium persulfate: 3 g / l

Next, the twill fabric is soaped with warm water at a temperature of 80 ° C. for 5 minutes with an open soaper, dried at 130 ° C. for 2 minutes with a tenter, and a high-pressure water stream under the following conditions using the spray nozzle shown in FIG. The injection process by was carried out.
<Injection treatment conditions by high pressure water flow>
Working fluid: Room temperature water injection hole diameter: 0.14 mm
High-pressure water jet shape: spacing between adjacent injection holes in the columnar fabric width direction: 0.6 mm
Number of arrangements in the fabric warp direction of the injection hole rows: Arrangement interval in the fabric warp direction of the 3 rows injection hole rows: 0.6 mm
(In the injection hole array arranged in the third line, when the first to third lines are directed in the traveling direction of the fabric, the nozzle position of the second injection hole line is set in the traveling direction with respect to the nozzle arrangement of the first line. (The third row was arranged in the same manner with respect to the second row by shifting 0.14 mm to the left.)
Ratio of the sum of the diameters of the injection holes (mm) to the length in the width direction (mm) of the fabric ((injection hole diameter x number of arrays) / width direction interval)
: 70%
Distance from spray nozzle to fabric surface: 2cm
Fabric running speed: 15m / min Fabric width: 1500mm
Fluid pressure: 15 MPa
Flow rate: 0.75 m ³ / min Flow rate: 108 m / s

After spraying with a high-pressure water stream, the twill fabric was dried in a tenter at 130 ° C. for 2 minutes to obtain a dust-free woven fabric of the present invention having a basis weight of 135 g / m ² .

(Example 2)
<Constituent fiber>
As the polyester filament, a false twisted yarn (for warp: 110 dtex / 36 filament, for weft: 123 dtex / 310 filament) obtained by false twisting a PET multifilament whose ethylene terephthalate unit is 95 mol% or more of all repeating units was used. . As a conductive filament, one polyester conductive multifilament yarn (trade name: Megana (E5), 28 dtex / 2 filament) manufactured by Unitika Trading Co., Ltd.) and the PET multifilament false twisted yarn (for warp: 110 dtex / 36 filament) , For weft yarn: 123 dtex / 310 filament) and a single twisted yarn having a twist number of 300 T / M was used.

<Textile structure>
As warp yarn, for each of the 40 false twisted yarns (110 dtex / 36 filaments), one of the above-mentioned combustible yarns (one polyester conductive multifilament raw yarn and one PET multifilament false twisted yarn (110 dtex / 36 filaments)) (Combusted) were arranged. As a weft, 40 compositing yarns (one polyester conductive multifilament raw yarn and one PET multifilament false twisting yarn (123 dtex / 310 filament)) with 40 false twisting yarns (123 dtex / 310 filament) 1) was arranged. A plain fabric having a warp density of 108 / 2.54 cm and a weft density of 80 / 2.54 cm was woven.

The fabric is refined and preset under the same conditions as in Example 1, impregnated with the aqueous solution shown in Formula 1, and then dried with a mangle of 30% by mass with a squeeze rate of 4.5% by mass. Then, the saturated steam treatment at 103 ° C. was performed for 10 minutes. Next, the twill fabric was soaped with warm water at a temperature of 80 ° C. for 5 minutes with an open soaper, dried at 130 ° C. for 2 minutes with a tenter, and sprayed with a high-pressure water stream under the same conditions as in Example 1. After spraying with a high-pressure water stream, the twill fabric was dried at 130 ° C. for 2 minutes in a tenter to obtain a dust-free garment fabric of the present invention having a basis weight of 112 g / m ² .

(Example 3)
<Constituent fiber>
A PET multifilament yarn (60 dtex / 180 filament) in which ethylene terephthalate units are 95 mol% or more of all repeating units is used as the polyester filament, and a polyester conductive multifilament yarn (Unitika Trading Co., Ltd.) is used as the conductive filament. Manufactured, trade name: Megana (E5), 28 dtex / 2 filament) and one PET multifilament raw yarn were used as a twisted yarn of 300 T / M.

<Textile structure>
As the warp, one of the above-mentioned combustible yarns is arranged for 35 PET multifilament raw yarns, and as the weft, one of the above-mentioned combustible yarns is arranged for 23 of the PET multifilament raw yarns, and the warp density is 208 pieces. A 2/2 twill woven fabric of /2.54 cm and a weft density of 137 yarns / 2.54 cm was woven.

The fabric is refined and preset under the same conditions as in Example 1, impregnated with the aqueous solution shown in Formula 1, and then dried with a mangle of 30% by mass with a squeeze rate of 4.5% by mass. Then, the saturated steam treatment at 103 ° C. was performed for 10 minutes. Next, the twill fabric was soaped with warm water at a temperature of 80 ° C. for 5 minutes with an open soaper, dried at 130 ° C. for 2 minutes with a tenter, and sprayed with a high-pressure water stream under the same conditions as in Example 1. After spraying with a high-pressure water stream, the twill fabric was dried at 130 ° C. for 2 minutes in a tenter to obtain a dust-free garment fabric according to the present invention having a basis weight of 100 g / m ² .

(Comparative Example 1)
Under the same conditions as in Example 1, a plain woven fabric was woven, refined, and preset, and a comparative fabric having a basis weight of 135 g / m ² was obtained. That is, the treatment after the aqueous solution impregnation treatment shown in Formula 1 in Example 1 was not performed.

(Comparative Example 2)
Under the same conditions as in Example 1, weaving a plain woven fabric, refining and pre-setting, impregnating the aqueous solution shown in the prescription 1, and then applying a squeeze rate of 30% by mass with a mangle and a squeeze deposit of 4.5% by mass Then, a saturated steam treatment at 103 ° C. was performed for 10 minutes without drying. Next, the twill fabric was soaped with warm water at a temperature of 80 ° C. for 5 minutes with an open soaper, and dried with a tenter at 130 ° C. for 2 minutes to obtain a comparative fabric with a basis weight of 135 g / m ² . That is, the process after the injection process by a high-pressure water flow in Example 1 was not implemented.

(Comparative Example 3)
A plain woven fabric was woven, refined, and preset under the same conditions as in Example 1, and an injection treatment with a high-pressure water flow was performed under the same conditions as in Example 1. After spraying with a high-pressure water stream, the twill fabric was dried in a tenter at 130 ° C. for 2 minutes to obtain a comparative fabric having a basis weight of 135 g / m ² . That is, the aqueous solution impregnation treatment of formulation 1, the treatment of squeezing the impregnated fabric with mangle, the saturated steam treatment, the soaping and the drying treatment after the soaping in Example 1 were not performed.

(Comparative Example 4)
A plain woven fabric was woven, refined, and preset under the same conditions as in Example 1. Next, after impregnating the woven fabric with the aqueous solution shown in Formula 2, a saturated vapor treatment at 103 ° C. was carried out for 10 minutes without drying, with a squeezing rate of 30% by mass and a squeeze adhesion amount of 2.0% by mass.
<Prescription 2>

: 66.7 g / l
(Manufactured by Shin-Nakamura Chemical Co., Ltd., n = 23 polyethylene glycol dimethacrylate in the formula)
Ammonium persulfate: 1.3 g / l

Next, the twill fabric was soaped with warm water at a temperature of 80 ° C. for 5 minutes with an open soaper, and dried with a tenter at 130 ° C. for 2 minutes to obtain a comparative fabric with a basis weight of 135 g / m ² . That is, the process after the injection process by a high-pressure water flow in Example 1 was not implemented.

  The friction voltage, the dust generation amount, and the bending rigidity B of the fabrics obtained in Examples 1 to 3 and Comparative Examples 1 to 4 were evaluated. The evaluation results are shown in Table 1.

  As is apparent from Table 1, Examples 1 to 3 satisfy the desired values in antistatic properties, low dust generation and texture, and have the performance as a fabric for dust-free garments required at the manufacturing site of semiconductors and the like. The provided fabric could be obtained. In the woven fabrics of Examples 1 to 3, it is presumed that the amount of adhesion, which was 4.5% by mass at the beginning, was lowered to an extent that approximated the amount of adhesion of Comparative Example 4 by the injection treatment with high-pressure water flow. Compared with the woven fabrics, the fabric had a very soft texture and was excellent in dust generation and antistatic properties. Therefore, the dust-free garment of the present invention is not obtained by forming the antistatic polymer so as to have a thin thickness on a woven fabric containing polyester filaments and conductive filaments as constituent fibers, but by high-pressure water flow. It turns out that it is obtained for the first time by performing an injection process. Moreover, compared with the textile fabric of Comparative Example 2, the fabrics of Examples 1 to 3 have a desired low dust generation property and texture while maintaining antistatic properties by performing an injection treatment with a high-pressure water flow. I understand that I was able to.

On the other hand, the woven fabric of Comparative Example 1 contained polyester filaments and conductive filaments as constituent fibers, but the antistatic polymer was not formed, so the frictional voltage exceeded 1000V. Further, the woven fabric had a dust generation amount exceeding 50 pieces / ft ³ · 100 cm ² . This is presumably because the oligomer or the like derived from the polymer forming the filament that is the constituent fiber remained and the oligomer or the like became a dust generation source because the injection treatment with the high-pressure water flow was not performed. From the above, the fabric of Comparative Example 1 was not provided with the performance as a fabric for dust-free garments required at the production site of semiconductors and the like in terms of antistatic properties and low dust generation.

In the woven fabric of Comparative Example 2, the dust generation amount exceeded 50 pieces / ft ³ · 100 cm ² . This is because the injection process by the high-pressure water flow was not performed, and therefore, the excess polymer adhered between the constituent fibers of the woven fabric and the oligomer derived from the polymer forming the filament that is the constituent fiber could not be removed. It is presumed that the amount of dust generation increased due to the polymer and the oligomer of Further, the fabric had a flexural rigidity B exceeding 0.1 gf · cm ² / cm. This is presumed that the texture became harder because the constituent fibers were fixed by the excess polymer. From the above, the fabric of Comparative Example 2 did not have the performance as a dust-free clothing fabric required at the production site of semiconductors and the like in terms of low dust generation and texture.

The fabric of Comparative Example 3 contained polyester filaments and conductive filaments as constituent fibers, but the antistatic polymer was not formed, so the frictional voltage exceeded 1000V. In addition, since the injection process by the high-pressure water flow was performed, it is estimated that oligomers and the like derived from the polymer forming the filament that is the constituent fiber are removed, and the dust generation amount was 50 / ft ³ · 100 cm ² or less. It was. From the above, the fabric of Comparative Example 3 was not provided with the performance as a dust-free clothing fabric required at the manufacturing site for semiconductors and the like in terms of antistatic properties.

The woven fabric of Comparative Example 4 had a dust generation amount exceeding 50 / ft ³ · 100 cm ² . This is an excess polymer and constituent fibers adhering between the fibers constituting the woven fabric because the antistatic polymer was formed so as to be thin, but the injection treatment by the high-pressure water flow was not performed. It is presumed that the amount of dust generation increased due to oligomers derived from the polymer forming the filament as a dust source. Further, the fabric had a flexural rigidity B exceeding 0.1 gf · cm ² / cm. This is presumed that the texture became harder because the constituent fibers were fixed by the excess polymer. From the above, the fabric of Comparative Example 4 did not have the performance as a dust-free clothing fabric required at the production site of semiconductors and the like in terms of low dust generation and texture.

DESCRIPTION OF SYMBOLS 1 Textile 2 Feed roll 3 Injection nozzle 4 Delivery roll 5 Injection hole

Claims (3)

A woven fabric in which a polymer obtained by reacting a bifunctional unsaturated carboxylic acid ester containing a polyalkylene glycol is formed on the surface of the constituent fiber, the polyester fiber and the conductive filament being included as constituent fibers, the following (1) to A dust-free woven fabric characterized by satisfying the requirement (3).
(1) The friction voltage of the JIS L 1094 method in an environment of 20 ° C. and 40% RH is 1000 V or less.
(2) The amount of dust generated with a particle size of 0.3 μm or more according to JIS B9923 (tumbling method) is 50 / ft ³ · 100 cm ² or less.
(3) The bending property B by the KES method is 0.1 gf · cm ² / cm or less.   Injecting with a high-pressure water stream is performed on a fabric in which a polyester filament and a conductive filament are included as constituent fibers and a polymer formed by reacting a bifunctional unsaturated carboxylic acid ester containing polyalkylene glycol on the constituent fiber surface is formed. The manufacturing method of the textile fabric for dust-free garments of Claim 1 characterized by these.   A dust-free garment comprising the dust-free garment according to claim 1.