JP2008212162A - Foot part protective socks - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide foot part protective socks which can effectively protecting the foot part of a worker from gaseous or liquid organic chemicals, harmful fine dust, bacteria and viruses, etc., are light in weight, have excellent wearability and removability, are excellent in moisture permeability, and can suppress the steamy feeling of feet. <P>SOLUTION: The foot part protective sock is provided with at least one each of moisture permeable film layers whose moisture permeability is ≥60g/m<SP>2</SP>×h and ≤850g/m<SP>2</SP>×h and layers (gas adsorption layers) containing a gas adsorbing substance. At least one moisture permeable film layer is arranged on the outer side of the gas absorption layer in the view from the inner side of the sock, the thickness of the laminate of the moisture permeable film layer and the gas absorption layer is ≤2.0 mm, and the stitch part of the sock is sealed with a resin which suppresses the transmission of organic chemicals. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to foot protection socks used by workers handling hazardous chemical substances. More specifically, it can effectively protect the operator's feet from gaseous or liquid organic chemicals that are absorbed from the skin, such as organophosphorus compounds, and adversely affect the human body, and harmful fine dust, bacteria, viruses, etc. In addition, the present invention relates to a foot protection sock that is lightweight, has good wearability, and is moisture permeable and can suppress the feeling of stuffiness of the wearer's foot.

  Conventionally, protective socks that protect the foot from harmful chemical substances have been proposed. For example, there is a material made of a material that does not allow permeation of harmful chemical substances, such as a rubber cloth, and has excellent protection performance. However, in this case, there is a feeling of fabric stiffness, inferior wear and tear, and there is no breathability and moisture permeability. There is a problem.

  On the other hand, a protective material using a fabric that is breathable and contains an adsorbent material such as activated carbon is also exemplified. They can effectively release sweat and water vapor that emanates from the feet to the outside of the socks due to breathability and suppress the feeling of stuffiness, but when the concentration of harmful chemicals is high, the gas can be released in a relatively short time. The problem is that adsorption by adsorbents approaches saturation and protection is reduced, and that complete protection against liquid organic chemicals, harmful fine dust, bacteria, viruses and other aerosols cannot be obtained. Yes (for example, Patent Document 1).

  Moreover, although a protective material with a low stuffiness is provided, which is provided with a film that is water-blocking while being liquid-blocking, it does not specify protection against gaseous organic chemicals. About the film which has general water vapor permeability, invasion of a gaseous organic chemical substance will be caused and possibility that a wearer's foot cannot be protected is high (for example, patent documents 2).

JP-A-8-218210 JP 2005-29938 A

  The present invention was made against the background of the problems of the prior art, and has protection against not only gaseous organic chemicals but also liquid organic chemicals, harmful aerosols and fine dusts, etc. An object of the present invention is to provide a foot protection sock having good moisture and moisture permeability (laminated without deteriorating the moisture permeability of a moisture permeable membrane) with less stuffiness.

In order to solve the above problems, the present invention has been completed as a result of intensive studies. That is, the present invention is as follows.
1. It has at least one moisture permeable membrane layer having a moisture permeability of not less than 60 g / m ² · h and not more than 850 g / m ² · h and a layer containing a gas adsorbing substance (gas adsorption layer), and viewed from the inside of the sock , At least one moisture permeable membrane layer is disposed outside the gas adsorption layer, the thickness of the laminate of the moisture permeable membrane layer and the gas adsorption layer is 2.0 mm or less, and the seam portion of the sock is organic Foot protection socks that are sealed with a resin that inhibits permeation of chemical substances.
2. The foot protection socks according to the above 1, wherein the gas adsorption layer is fibrous activated carbon.
3. 3. The foot protection sock according to 1 or 2 above, wherein the moisture permeable membrane layer and the gas adsorption layer are laminated with an adhesive having a melt index of 200 g / 10 min or less.
4). 4. The foot protection socks according to any one of 1 to 3 above, wherein an outer layer additional layer and / or an inner layer additional layer are provided.
5. 5. The foot protection sock according to any one of 1 to 4 above, wherein the thickness when the outer layer additional layer and / or the inner layer additional layer is provided is 3.0 mm or less.
6). The foot protection socks according to any one of 1 to 5 above, wherein an antiskid (protective layer) selected from natural leather, artificial leather, woven fabric, knitted fabric, and felt is attached to the palm of the outer layer additional layer.

  The foot protection sock according to the present invention comprises a protective material characterized by having a moisture permeable membrane layer and a gas adsorbing layer, and is protective against gaseous and liquid organic chemicals and toxic aerosols and fine dusts. In addition, the moisture inside the socks can be suppressed due to its high moisture permeability, and it is excellent in wear / removability, flexibility, and wearing feeling.

Hereinafter, the present invention will be described in detail.
As a material of the moisture permeable membrane layer constituting the foot protection socks of the present invention, a resin, silicon, polyacrylate, polyacrylonitrile, polyamide, polyamideimide, polyurethane, polyester, which can form a microporous membrane with a known urethane resin Any polymer that has film-forming properties such as copolymerized polyester, polyolefin, ethylene-vinyl alcohol copolymer, polyvinyl alcohol, cellulose, cellulose derivative, etc. may be used as long as it has moisture permeability after film formation. Further, these materials may be used alone, mixed, or sequentially laminated to form a film. In addition, other additives such as titanium oxide and silica may be added to the resin layer.

  The thickness of the moisture permeable membrane layer used in the present invention is 3 μm or more and 100 μm or less, preferably 5 μm or more and 70 μm or less. If it is 3 μm or less, sufficient strength cannot be obtained, and problems such as pinholes and cracks are likely to occur. On the other hand, if it exceeds 100 μm, the moisture permeability decreases and the material becomes thick, making it unsuitable for the intended sock material.

The basis weight of the moisture permeable membrane layer is 200 g / m ² or less, preferably 150 g / m ² or less. If it is 200 g / m ² or more, it cannot be a sock material that is the object of the present invention and is lightweight and excellent in wear and desorption.

The moisture permeability of the moisture permeable film layer, 60g / ^{m 2} · h or more 850g / ^{m 2} · h or less, preferably at most 100g / ^{m 2} · h or more 750g / ^{m 2} ·. This is because sweat and vapor emitted from the wearer cannot be effectively released to the outside at 60 g / m ² · h or less, and durability is problematic when it exceeds 850 g / m ² · h.

The moisture permeable film may be used alone by forming a film, but it is preferably combined with a moisture permeable substrate for reinforcement or protection of the film. The moisture permeability of the substrate is required to be 200 g / m ² · h or more, preferably 300 g / m ² · h or more so as not to impair the moisture permeability of the moisture permeable membrane. In order to make the sock material light and flexible while maintaining the strength, the thickness of the base material is preferably 0.05 mm or more and 0.50 mm or less. As the substrate, a sheet-like fiber aggregate or a moisture-permeable microporous or nonporous film or membrane can be used.
Sheet fiber aggregates include natural fibers such as cotton, hemp, hair, and silk, regenerated fibers such as rayon, polynosic, cupra, and lyocell, semi-synthetic fibers such as acetate and triacetate, nylon, aramid, vinylon, vinylidene, and polychlorinated Examples include woven fabrics, knitted fabrics, and nonwoven fabrics made of synthetic fibers such as vinyl, polyester, acrylic, acrylic, polyethylene, polypropylene, polyurethane, polyclar, polyarylate, polybenzazole, polyimide, polyphenylene sulfide, and the like. These fibers may be used alone or in combination by blending, union, union, etc. to form a sheet-like fiber assembly.
Examples of the microporous or nonporous film or membrane having moisture permeability include sheet-like materials such as polyethylene, polypropylene, polytetrafluoroethylene, copolymerized polyester, polyurethane, polyether polyurethane, and acrylate.

  The polymer that forms the moisture permeable membrane described above is formed by forming a fine fiber nonwoven fabric by a method of once forming a polymer film by a casting method, an extrusion method, an injection molding method or the like, a melt blown method, a flash spinning method, an electrospinning method, And a method of coating or dipping the polymer solution or low polymer on the substrate, followed by drying or polymerization and solidification.

  When a moisture permeable membrane is combined with a base material to form a foot protection sock, it can be laminated by a laminating method while preventing a decrease in moisture permeability and maintaining the flexibility of the material. When adhering between the moisture permeable membrane and the substrate with polyurethane or acrylate emulsion, or when welding or fusing part of the moisture permeable membrane or substrate, either the entire surface adhesion or partial adhesion in the form of dots I do not care. It is also possible to thermally bond via a low-weight non-woven fabric, network or powder made of low melting point copolyester, polyamide or polyolefin.

  In the present invention, the above-mentioned base material may be subjected to post-processing such as water / oil repellent processing, flame retardant processing and the like. The water repellent is not particularly limited, such as fluorine, polysiloxane, and paraffin.

  The gaseous organic chemical substance here is a gaseous compound having one or more carbon elements. It is a gaseous chemical substance having a relatively large molecular weight of 50 or more and capable of adsorbing a gas adsorbing substance such as activated carbon. For example, organic phosphorus compounds used for agricultural chemicals, insecticides and herbicides, and general organic solvents such as toluene, methylene chloride and chloroform used for painting work and the like can be mentioned.

  The gas adsorbing layer used in the present invention may be a target adsorbed material such as a carbon-based adsorbent such as activated carbon or carbon black, or an inorganic adsorbent such as silica gel, zeolite-based adsorbent, silicon carbide, or activated alumina. It can be selected as appropriate. Among them, activated carbon capable of dealing with a wide range of gases is preferable, and fibrous activated carbon is more preferable because it has a large adsorption rate and adsorption capacity and can effectively prevent permeation when used in a small amount.

The BET specific surface area of the activated carbon is preferably 700 m ² / g or more and 3000 m ² / g or less, and more preferably 1000 m ² / g or more and 2500 m ² / g or less in order to obtain sufficient permeation suppression properties with a small amount of use. If the BET specific surface area is less than 700 m ² / g, a large amount of activated carbon is required to obtain sufficient protection, and the material becomes heavy. On the other hand, if it exceeds 3000 m ² / g, there arises a problem of desorbing the adsorbed gaseous organic chemical substance.

The basis weight of the activated carbon is preferably 20 g / m ² or more and 200 g / m ² or less, more preferably 50 g / m ² or more and 150 g / m ² or less. When it is less than 20 g / m ² , the capacity that can be adsorbed is reduced, and the use time is limited. On the other hand, if it exceeds 200 g / m ² , the material becomes heavy and thick, and there is a problem that the wear / removability, flexibility, and wearing feeling deteriorate.

  The method of using fibrous activated carbon to obtain effective permeation suppression with a small amount of use is an effective means, but the raw material of the fibrous activated carbon used at that time is natural cellulose fibers such as cotton and hemp Other examples include regenerated cellulose fibers such as rayon, polynosic, and solvent spinning, and synthetic fibers such as polyvinyl alcohol fibers, acrylic fibers, aromatic polyamide fibers, lignin fibers, phenol fibers, and petroleum pitch fibers. From the physical properties (strength etc.) and adsorption performance of the fibrous activated carbon obtained, regenerated cellulose fibers, phenolic fibers and acrylic fibers are preferred. After weaving, knitting, and nonwoven fabric using these short fibers or long fibers of the raw material fibers and containing an appropriate flameproofing agent as necessary, flameproofing treatment is performed at a temperature of 450 ° C. or lower, Subsequently, fibrous activated carbon can be manufactured by the well-known method of activating carbonization at the temperature of 500 degreeC or more and 1000 degrees C or less.

  As a method for forming fibrous activated carbon into a sheet, a method of adhering a gas adsorbing substance to a sheet substrate with a binder, or a method of making an adsorbent into a slurry including an appropriate pulp and binder, and making a paper with a wet paper machine, or The adsorbent sheet can be obtained by a known method in which the activated carbon fiber raw material fibers are woven, knitted, or nonwoven fabric in advance and subjected to a flame resistance treatment as necessary, followed by carbonization and activation.

  Therefore, the form of the fibrous activated carbon sheet includes a woven form, a knitted form, a non-woven form, a felt form, a paper form, a film form, etc. A knitted shape is preferred.

  The following two methods can be used as the means for laminating the moisture permeable membrane layer and the gas adsorption layer. As a first method, the gas adsorption layer is bonded to the moisture permeable membrane layer with an adhesive. Examples of the second method include a method in which one of the moisture permeable membrane layer and the gas adsorption layer is prepared in advance and the other is coated or dipped.

  Examples of the adhesive to be used include urethane, vinyl alcohol, ester, epoxy, vinyl chloride, olefin, amide, acrylic, cellulose, etc., but considering the flexibility after bonding, urethane, Vinyl alcohol type, ester type and amide type are preferred.

  The melt index of the adhesive to be used is 200 g / 10 min or less, preferably 150 g / 10 min or less. When the bonding is performed at 200 g / 10 min or less, the area where the adhesive covers the surface of the gas adsorbing substance can be reduced, and the deterioration of the gas adsorbing performance due to lamination can be suppressed. It is also possible to suppress the decrease in.

  The adhesive used in the present invention is preferably non-woven. Since uniform application is difficult if particles are used, adsorbents cannot be fixed when adhered in small amounts, become hard when used in large amounts, and further reduce adsorption performance. Moreover, if it is a film, air permeability will fall.

  Laminating the inner layer additional layer and the gas adsorbing layer in advance by quilting is an effective means for suppressing the deterioration of the performance of the gas adsorbing layer due to the lamination and obtaining a more flexible laminated material. A protective material for socks can be obtained by previously laminating the two layers by quilting and then laminating the moisture permeable membrane layer with an adhesive.

  The number of moisture permeable membrane layers and the number of gas adsorption layers must be at least one each. However, the number of moisture permeable membrane layers and the number of gas adsorption layers is necessary for the purpose of increasing flexibility and when there are multiple target gases. It is an effective means to select and use them by overlapping.

  As the stacking order of the moisture permeable membrane layer and the gas adsorbing layer, it is preferable that at least one moisture permeable membrane layer is provided outside the gas adsorbing layer when viewed from the inside of the sock in consideration of the life of the gas adsorbing layer. Further, when a plurality of moisture permeable membrane layers are used, the gas adsorption layer may be sandwiched between the moisture permeable membrane layers in order to protect the gas adsorption layer.

As mass of the laminated body which consists of a moisture-permeable film layer and a gas adsorption layer, 300 g / m < ² > or less is preferable, More preferably, 250 g / m < ² > or less is preferable. This is because if it exceeds 300 g / m ² , the wear / removability, flexibility, and wearing feeling of the socks will be reduced.

  Further, the thickness of the laminate is 2.0 mm or less, preferably 1.5 mm or less. If it exceeds 2.0 mm, the wear / removal property is lowered and it is not suitable for the sock material for this purpose.

For liquid organic chemicals entering from the outside, it is an effective means to sandwich a liquid-permeable non-woven fabric and oil-absorbing paper between the moisture permeable membrane layer and the gas adsorbing layer.
The material of the nonwoven fabric to be used is not particularly limited, such as polyolefin, polyester, polylactic acid, polycarbonate, polyvinyl chloride, polyvinylidene chloride, etc. In addition, these materials are made into paper to form a moisture permeable membrane. It may be used by being sandwiched between the layer and the gas adsorption layer.

  As shown in FIG. 1, it is preferable to provide an outer layer additional layer on the outermost side of the laminated material composed of the moisture permeable membrane layer and the gas adsorption layer. The purpose of the outer layer additional layer is to protect the moisture permeable membrane layer and the gas adsorbing layer from mechanical force given from the outside, to supplement the mechanical strength, and to provide water repellency and oil repellency A knitted fabric or a nonwoven fabric is preferred. As materials for the outer layer additional layer, those that can take the form of woven fabric, knitted fabric and non-woven fabric can be used without limitation. Cotton, nylon, aromatic polyamide, wholly aromatic polyester, polybenzazole fiber, fluorine fiber, glass Fiber etc. can be used.

As an outer layer additional layer, a woven fabric, a knitted fabric, or a non-woven fabric having a water repellency of 4 or more when the spray test described in JIS L-1092 5.2 is performed and an oil repellency by AATCC Test Method 118 of 4 or more. Can be used preferably, but it is recommended to use one that is flexible.
The laminated material consisting of the moisture permeable membrane layer and the gas adsorbing layer and the outer layer additional layer may be pre-adhered with an adhesive, or may be sewn in a superposed state without bonding, considering flexibility. Socks may be made. Further, if necessary, another woven fabric, knitted fabric, natural leather, artificial leather, felt or the like may be laminated on the outer layer additional layer, and a protective layer (non-slip) or the like may be provided.

As shown in FIG. 1, it is preferable to provide an inner layer additional layer on the innermost side of the laminated material composed of the moisture permeable membrane layer and the gas adsorption layer. Examples of the inner layer additional layer include materials such as a woven fabric, a knitted fabric, a nonwoven fabric, and an apertured film, but a woven fabric or a knitted fabric woven or knitted at a coarse density is preferable in terms of moisture permeability and flexibility.
The purpose of the inner layer additional layer is to protect the gas adsorbing layer and the moisture permeable membrane layer from mechanical force applied from the outside, and to suppress the sticky feeling caused by sweat radiated from the wearer's foot.

The basis weight of the laminate provided with the outer layer additional layer and / or the inner layer additional layer is preferably 600 g / m ² or less, and more preferably 500 g / m ² or less. This is because if it exceeds 600 g / m ² , the burden on the foot is large and the attachment / detachment property is reduced.

  The thickness of the foot protection sock material of the present invention is 3.0 mm or less, preferably 2.5 mm or less. If the thickness exceeds 3.0 mm, the wear / removability is deteriorated, and it is hard and the feeling of wearing is deteriorated, so that it is not suitable for the sock material for this purpose.

  The method of producing socks with the above materials is, for example, cutting a laminated body of a moisture permeable membrane, a gas adsorption layer and an inner layer additional layer into a foot shape, and sewing the two outer peripheral portions with a heat fusion method or a sewing thread, After the inner socks are prepared in advance by the method of sealing the sewing part with protective sealing tape, the outer socks on the outer layer additional layer are also sewn and sealed in the same way for the outer layers. It is also possible to use stacked socks. Alternatively, the outer layer additional layer, the laminate of the moisture permeable membrane and the gas adsorbing layer, and the inner layer additional layer may be used alone as a sock, and then stacked without bonding them to form a sock having a three-layer structure. Alternatively, after all the materials are bonded, socks may be used. Moreover, the sock which consists of a moisture-permeable film and a gas adsorption layer which is not equipped with the outer layer addition layer and / or the inner layer addition layer may be sufficient.

  Foot protection socks need to prevent the penetration of gaseous and liquid chemicals from seams and the entry of harmful fine dust, bacteria, viruses and other aerosols, and do not impair moisture permeability and flexibility Consideration is necessary. For this purpose, it is preferable that the sewing is performed by flash sewing. In the present invention, the seam is further sealed to prevent penetration from the seam.

In the sealing process, the seam portion is covered with a resin that has a permeation inhibiting property particularly for gaseous and liquid chemical substances and sealed. As a material used for processing, a solution of a resin having a permeation suppression property, a permeation-inhibiting and adhesive resin film, a seal tape using a permeation suppression resin film, and the like can be used. As the sealing tape, one having two or more layers including a gas permeation suppressing layer and an adhesive layer can be used. As the resin for the adhesive layer, a hot melt resin, a low temperature (150 ° C. or lower) curable adhesive, or a moisture curable adhesive is used. The adhesive can be used. In consideration of processability and peel resistance of the seal tape after processing, it is more preferable to use a curable adhesive. The type of the resin is not particularly limited as long as the seam can be sealed, but a polyurethane resin is preferable in terms of flexibility, adhesiveness, and moisture permeability, and among the polyurethane resins, a curable resin is preferable.
The sealing method can also be a method of laminating a resin film with permeation suppression after applying an adhesive to the seam part, but the method of using a film or tape made in advance with the above resin as a sealing material is From the viewpoint of sex.

The foot protection socks produced by the method described above preferably have a gas permeability from the outside to the inside of the socks with the socks worn of less than 1%, preferably less than 0.1%. More preferred. This is because if it exceeds 1%, the human body may be adversely affected.
The foot protection socks preferably have a particle collection efficiency of 90% or more, more preferably 99% or more, from the outside to the inside of the sock with the socks attached. This is because if it is less than 90%, viruses and bacteria may adversely affect the human body.

  Next, the present invention will be specifically described using examples and comparative examples, but the present invention is not limited to these examples. The various evaluations and test values obtained in the present invention are based on the methods described below.

[Gas permeability test method]:
Test apparatus: The gas permeability test apparatus shown in FIG. 2 was used, and the following procedures (1) to (3) were performed.
(1) 1m ³ (width 1 x depth 1 x height 1 (m)) A foot type mannequin fitted with foot protection socks is installed in the chamber, and sampling is performed so that the gas permeation concentration inside and outside the socks can be measured. Connect the tube (Note that the foot mannequin and sock hem should be completely sealed with vinyl tape so that there is no gap between them.)
(2) A toluene special grade reagent (Nacalai Tesque) was placed in a gas cleaning bottle (manufactured by AS ONE), and toluene-containing nitrogen bubbled with dry nitrogen was fed into the chamber for a certain period of time. At this time, the initial concentration of toluene gas is adjusted to about 1000 ppm.
(3) The gas inside and outside the foot protection socks is sampled with a syringe at regular intervals, measured by gas chromatography (HP Hewlett-Packard Japan HP6890), the gas permeability is calculated by the following formula, and the average value of 24 hr Ask for.
Gas permeability (%) = (sock inner gas concentration / sock outer gas concentration) × 100

[Particle collection efficiency measurement method]:
Test apparatus: Measurement was performed according to the following procedures (1) to (4) using the particle collection efficiency measuring apparatus shown in FIG.
(1) 1m ³ (width 1 × depth 1 × height 1 (m)) A foot-shaped mannequin with foot protection socks is installed in the chamber, and a sampling tube is used to measure the number of particles inside and outside the socks Is connected to a particle measuring instrument (KC-14 manufactured by RION Co., Ltd.) (to be completely sealed with vinyl tape so that there is no gap between the foot mannequin and the bottom of the sock).
(2) The atmospheric dust in the BOX is completely removed with a HEPA filter.
(3) NaCl particles were generated in the chamber using a Ruskin nozzle type particle generator and a diffusion dryer (Model 306200, manufactured by TSI). At this time, the NaCl particles are adjusted to have an average particle diameter of 0.1 μm and a particle concentration of about 50,000 (pieces / 10 ⁻² CF).
(4) The number of NaCl particles of 0.3 μm or more on the inner side and outer side of the foot protection socks is measured with the measuring device, and the particle collection efficiency is calculated by the following equation.
Particle collection efficiency (%) = (1−number of socks inside particles / number of socks outside particles) × 100

[Moisture permeability]:
According to JIS L-1099 calcium chloride method.

[Specific surface area]:
An adsorption isotherm of nitrogen was obtained and calculated by the BET method based on this.

[Mass (weight)]
According to JIS L-1018 8.4 and JIS L-1096 8.4.

[thickness]:
According to JIS L-1018 8.5 and JIS L-1096 8.5.

[Melt index]:
According to JIS K-7210.

[Removability]:
A questionnaire survey was conducted to determine the ease of wearing, the ease of taking off, and the feeling of wearing when wearing / removing socks.

[Dampness]:
The feeling of stuffiness after wearing the socks for 1 h was determined from a questionnaire survey.

[Production example]
(Example of gas adsorption layer production)
A fibrous activated carbon knitted fabric was produced as a gas adsorption layer by the following method. A milled knitted fabric with a basis weight of 200 g / m ² made of spun yarn of 2.2 decitex 20 novolak phenol resin fiber was heated in an inert atmosphere at 400 ° C. for 30 minutes, and then inactive to 870 ° C. for 30 minutes. Heating was performed in the atmosphere to cause carbonization, and then activation was performed at a temperature of 870 ° C. for 2 hours in an atmosphere containing 12% by volume of water vapor. The basis weight of the obtained knitted fibrous activated carbon was 120 g / m ² , specific surface area 1400 m ² / g, and thickness 1.15 mm.

(External layer additional layer production example)
The outer layer additional layer was produced by the following method. A plain woven fabric using 40 yarns of cotton yarn was subjected to fluorine-based water and oil repellency treatment, and 0.54% by mass was adhered as a resin solid content. The obtained woven fabric has a thickness of 0.30 mm, a basis weight of 120 g / m ² , a bending resistance of 0.56 gf · cm, and air permeability of 80 cm ³ / cm ² · s with a water level gauge of 1.27 cm, water repellent The degree was 5 and the oil repellency was grade 6.

(Inner layer additional layer production example)
The inner layer additional layer was produced by the following method. Using a 28 gauge two-sheet tricot machine, set polyester filaments (82.5 dtex, 36 filaments) on the front cage and polyester filaments (22 dtex, monofilament) on the back cage, respectively. After knitting a warp knitted fabric with a back 1-0 / 2-3 structure, it was refined by a conventional method and further dyed with a disperse dye. The knitted fabric thus obtained has a thickness of 0.32 mm, a basis weight of 60 g / m ² , a breathability of 700 cm ³ / cm ² · s with a water level gauge of 1.27 cm, water repellency of 5, oil repellency It was 6th grade.

[Example 1]
Aqua vent manufactured by Toyobo Co., Ltd., which is a waterproof and moisture-permeable fabric coated with nylon woven fabric as the moisture-permeable membrane layer, has a thickness of 0.22 mm, a basis weight of 108 g / m ² , and a moisture permeability of 418 g / m ² · h. did. The moisture permeable membrane layer is bonded to the gas adsorbing layer and the inner layer additional layer with a breathable non-woven hot melt adhesive (Dynac manufactured by Kureha Tech Co., Ltd.) having a basis weight of 20 g / m ² and a melt index of 60 g / 10 min. It was. The laminate was cut into a sock shape and sewed by flash stitching, and then the seam portion was sealed by the following sealing method to form an inner sock.
Seal processing method:
Eval EF-XL manufactured by Kuraray Co., Ltd. was used as the selectively permeable membrane for the seal tape. Eval EF-XL had a thickness of 12 μm and a mass of 15 g / m ² .
A curable moisture-permeable polyurethane resin (Samprene LQ120 manufactured by Sanyo Chemical Industries, Ltd.) having a solid content of 30% by mass is cast on the permselective membrane, and the coating is applied while adjusting the film thickness with a coater, followed by drying at 100 ° C. I let you. The seal tape was cut to a width of 20 mm, and the seal tape was placed on the seam of a sock so that the adhesive surface would be down and pressure-bonded, and then moisture-cured under conditions of 60 ° C. and RH 95% for 24 hours.
Further, the outer layer additional layer was cut into a sock shape, sewed by flash stitching, and further subjected to seal processing in the same manner as described above to obtain an outer sock. These inner socks and outer socks were overlapped to form foot protection socks. The material for the foot protection socks had a basis weight of 475 g / m ² , a thickness of 2.05 mm, and a moisture permeability of 370 g / m ² · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, and the feeling of stuffiness when this foot protection sock is used.

[Example 2]
Except for using a PVA film (Poval manufactured by Kuraray Co., Ltd.) having a basis weight of 32 g / m ² , a thickness of 30 μm, and a moisture permeability of 146 g / m ² · h as a moisture permeable membrane layer, Produced. The material for the foot protection socks had a weight per unit area of 487 g / m ² , a thickness of 1.86 mm, and a moisture permeability of 127 g / m ² · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, the detachability, and the stuffiness feeling when using this foot protection sock.

[Comparative Example 1]
Basis weight 59 g / ^{m 2,} thickness 38 [mu] m, except that the moisture permeability was used polyvinyl fluoride film of 0.46g / ^{m 2} · h as the moisture permeable film layer was manufactured socks in the same manner as in Example 1. The material of the foot protection sock, basis weight 325 g / ^{m 2,} and a thickness of 1.87 mm, moisture permeability 0.3g / ^{m 2} · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, the detachability, and the stuffiness feeling when using this foot protection sock.

[Comparative Example 2]
In Example 1, a foot protection sock was produced from the laminate excluding the gas adsorption layer. The material of the foot protection sock, basis weight 332 g / ^{m 2,} and a thickness of 0.95 mm, moisture permeability 403g / ^{m 2} · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, the detachability, and the stuffiness feeling when using this foot protection sock.

[Comparative Example 3]
In Example 1, a foot protection sock was produced from the laminate excluding the moisture permeable membrane layer. The material for the foot protection socks was a basis weight of 365 / m ² , a thickness of 1.88 mm, and a moisture permeability of 455 g / m ² · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, the detachability, and the stuffiness feeling when using this foot protection sock.

[Comparative Example 4]
In Example 1, a PVA film (Poval manufactured by Kuraray Co., Ltd.) having a basis weight of 32 g / m ² , a thickness of 30 μm, and a moisture permeability of 146 g / m ² · h as a moisture permeable membrane layer has a basis weight of 80 g / m ² and a thickness of 1. A sock was produced in the same manner as in Example 1 except that a 15 mm polyester spunlace nonwoven fabric (manufactured by Toyobo Co., Ltd.) was bonded with a breathable nonwoven fabric hot melt adhesive. The material for the foot protection socks had a basis weight of 503 g / m ² , a thickness of 3.11 mm, and a moisture permeability of 115 g / m ² · h. Table 1 shows the gas permeability test results, the particle collection efficiency measurement results, the moisture permeability, the detachability, and the stuffiness feeling when using this foot protection sock.

  While Examples 1 and 2 are suitable foot protection socks with excellent gas permeation suppression, particle collection efficiency, moisture permeability, and detachability, and less stuffiness, Comparative Example 1 has low moisture permeability. Therefore, it is a result that a feeling of stuffiness occurs, Comparative Example 2 is a result of inferior gas permeation suppression, Comparative Example 3 has a low particle collection efficiency, Comparative Example 4 has a poor wearing feeling, and for the purpose of the present invention Was not enough.

  The foot protection socks of the present invention can protect workers from gaseous and liquid organic chemicals, greatly reduce the risk of pinholes during work, and are less sticky due to sweat due to moisture permeability, It is a foot protection sock with good wearability, and contributes greatly to the industry.

It is a schematic cross section which shows an example of the laminated body which comprises the foot | leg part protection socks of this invention. It is the schematic which shows a gas-permeability test method. It is the schematic which shows the particle collection efficiency measuring method.

Explanation of symbols

1: Outer layer additional layer 2: Moisture permeable membrane layer 3: Gas adsorption layer 4: Inner layer additional layer 5: Chamber 6: Foot protection socks 7: Foot type mannequin 8: Sampling tube (inside socks)
9: Sampling tube (outside of socks)
10: Gas cleaning bottle 11: Chamber 12: Foot protection socks 13: Foot mannequin 14: Sampling tube (inside socks)
15: Sampling tube (outside of socks)
16: Particle measuring device 17: Particle measuring device 18: Ruskin nozzle type particle generator 19: Diffusion dryer

Claims (6)

It has at least one moisture permeable membrane layer having a moisture permeability of not less than 60 g / m ² · h and not more than 850 g / m ² · h and a layer containing a gas adsorbing substance (gas adsorption layer), and viewed from the inside of the sock , At least one moisture permeable membrane layer is disposed outside the gas adsorption layer, the thickness of the laminate of the moisture permeable membrane layer and the gas adsorption layer is 2.0 mm or less, and the seam portion of the sock is organic Foot protection socks that are sealed with a resin that inhibits permeation of chemical substances.   The foot protection sock according to claim 1, wherein the gas adsorption layer is fibrous activated carbon.   The foot protection sock according to claim 1 or 2, wherein the moisture permeable membrane layer and the gas adsorption layer are laminated with an adhesive having a melt index of 200 g / 10 min or less.   The foot protection socks according to any one of claims 1 to 3, wherein an outer layer additional layer and / or an inner layer additional layer are provided.   The foot protection socks according to any one of claims 1 to 4, wherein the outer layer additional layer and / or the inner layer additional layer has a thickness of 3.0 mm or less. The foot protection socks according to any one of claims 1 to 5, wherein an antiskid (protective layer) selected from natural leather, artificial leather, woven fabric, knitted fabric, and felt is attached to the palm of the additional layer of the outer layer.

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