JPH08308945A - Material for protective wear - Google Patents

Abstract

PURPOSE: To prevent droplets penetration under pressure, improve air permeability and water vapor permeability, and reduce the feeling of hotness and sweatiness by laminating a liquid toxic chemical protection layer made of cut-pile cloth, a gaseous toxic chemical absorption layer, and an absorbent protection layer. CONSTITUTION: A liquid toxic chemical protection layer (protection layer) is composed of cut-pile cloth. Pile yarns composing the cut-pile cloth are formed by 50 to 350-denier synthetic fiber filaments with water repellency of 80 or higher, oil repellency of grade 4 or higher, and apparent specific gravity of 0.10 to 0.30. Spheres are formed at the tips of cut piles by thermal fusion. The thickness of the cut-pile cloth is set at 3.0mm or less under the load of 7gf/cm<2> and 0.5mm or more under the load of 1kgf/cm<2> . A gaseous toxic chemical absorption layer (absorption layer) is formed by thermal fixing of particulate or powder activated carbon together with an adhesive to the absorbent protection layer. At the time the absorbent protection layer is placed outside the gaseous toxic chemical absorption layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material to be used as protective clothing for protecting a worker in a work of handling a harmful substance, and more specifically, a toxic material such as a pesticide spraying work, or production or use of chemicals. The present invention relates to a material to be used as protective clothing for protecting workers in the work of handling harmful substances such as chemicals, especially organic phosphorus compounds, which are absorbed from the skin and adversely affect the human body.

[0002]

2. Description of the Related Art Conventionally, various types of protective clothing for protecting the human body from toxic chemical agents have been proposed. For example, there is a material such as rubberized cloth which is made of a material in which liquid and gaseous harmful substances do not penetrate, and has excellent protection performance. However, since the fabric is heavy and the workability when worn is poor, and there is no breathability at all, heat stress is added in a hot environment or work requiring physical exercise, which causes serious injury to the worker. there were.

JP-A-60-92777 or JP-A-6-62
0-96267 discloses a technique in which a porous film is formed on the front surface or the back surface of a cloth to protect it from liquid chemical substances and to reduce stuffiness. However, it is impossible to completely protect against gaseous chemical substances, and because the vapor permeability or air permeability is insufficient, it is impossible to eliminate the stuffy feeling under excessive heat or excessive exercise.

JP-A-4-255342 discloses a material composed of a liquid impermeable layer and a gas passage blocking layer. Solid particles that absorb, adsorb, and detoxify harmful gas are used for the gas passage blocking layer, and can protect liquid and gaseous chemical substances. However, in this structure, since the porous film is used for liquid protection, the moisture permeability or the air permeability is insufficient as in the above-mentioned conventional example, and there is a problem in wearing feeling.

Japanese Unexamined Patent Publication (Kokai) No. 2-190328 exemplifies a laminated woven fabric for a protective garment comprising an activated carbon cloth and a reinforced woven fabric adhered to the activated carbon cloth. This aims at high mechanical strength by the reinforcing fabric and protection of gaseous chemicals by the activated carbon cloth, but insufficient protection against liquid chemicals.

In Japanese Patent Laid-Open No. 57-156036 or Japanese Utility Model Laid-Open No. 61-133508, there is proposed a protective clothing material in which a pile having a water-repellent / oil-repellent property is arranged on the surface layer and an activated carbon layer is arranged below the pile. There is. Due to this structure, the surface layer protects liquid chemicals and the gaseous chemicals are adsorbed by activated carbon. Moreover, since these materials are breathable, heat stress is small even in a hot environment.
However, the pressure conditions that occur when actually wearing and working as protective clothing, that is, the pressure caused by the human body weight when sitting or lying down, the pressure that occurs when wearing work equipment,
There is another problem that the surface pile layer is deformed by pressure applied by contact with an article at the work site and the liquid chemical substance penetrates.

[0007]

DISCLOSURE OF THE INVENTION The object of the present invention is to prevent penetration of liquid and gaseous toxic chemical substances, especially liquid droplets under pressure, and to have excellent breathability and moisture permeability, and to keep heat even when worn. The object is to provide a material for protective clothing that has a low feeling of stuffiness and dampness.

[0008]

In order to solve the above problems, the inventors of the present invention have earnestly studied and arrived at the present invention. That is, the present invention includes (a) a liquid toxic chemical substance protective layer, and (b)
A protective clothing material comprising a laminated structure of a gaseous toxic chemical substance adsorption layer and (c) an adsorbent protective layer, wherein the liquid toxic chemical substance protective layer is composed of a cut pile fabric, and the cut pile fabric is Fineness of the constituent pile yarns: 50-
It is made of synthetic fiber filament yarn that is 350 denier monofilament, water repellency: 80 or more, and oil repellency:
Class 4 or higher, apparent specific gravity: 0.10 to 0.30, the tip of the cut pile forms a spherical material by heat melting, and the thickness of the cut pile fabric is 7 gf / cm ² when loaded: 3. 0m
m or less, 1 kgf / cm ² weighted: 0.5 mm or more for protective clothing material.

As the gaseous toxic chemical substance adsorbing layer (b), it is recommended to use a fibrous activated carbon cloth. Although the above-mentioned protective clothing material has a three-layer structure, it is a particularly preferable embodiment to arrange a pile protective layer outside the liquid toxic chemical substance protective layer of (a) to form a four-layer structure.

[0010]

The liquid toxic substance protective layer of (a) is arranged on the side of the protective clothing material farther from the human body, that is, on the outer side, and the liquid toxic substance adheres to this layer, which is the state that occurs under normal wearing conditions, that is, the liquid toxic substance. It is possible to prevent the penetration of the substance even when it is pressed from above. Liquid toxic substances generally adhere to clothing materials in the form of mist or droplets. In order to prevent these liquid substances from penetrating into the material, it is essential that the liquid substances are hard to get wet. Not only water repellency but also oil repellency is necessary to prevent penetration of liquids having various properties. If the water repellency is less than 80 or the oleophobicity is less than grade 4, the liquid substance may easily penetrate and harm the human body. As one of the effective means for obtaining both properties of water repellency of 80 or more and oil repellency of grade 4 or more, a cut pile fabric made of synthetic fiber is treated with a fluorine-based water repellent / oil repellent agent. The method of processing can be illustrated.

In order to prevent the permeation of droplets under pressure, which is the object of the present invention, it is not enough to make the surface of the fabric water-repellent or oil-repellent, and it is not possible to use the gap between the yarns constituting the fabric. It is necessary to prevent permeation due to pressure. For that purpose, it is useful to use a monofilament of thermoplastic synthetic fiber having a denier of 50 to 350 as the pile yarn. When the fineness of the pile yarn is less than 50 denier, the pile yarn falls down due to pressure, and the adhered droplets penetrate into the gaps between the fibers and permeate to the back surface of the fabric. On the other hand, if it exceeds 350 denier, the fabric becomes stiff and the wearability of the cloth material becomes poor.

As another preferable condition, it is effective that the cut pile fabric has a structure in which a spherical object is formed at the tip of the pile by heat melting. If the tip of the pile yarn is heat-melted and solidified to form a spherical object, even if the pile yarn falls down due to pressure, the tips of the adjacent pile yarns do not come into contact with each other and sink, and the surface of the fabric or the fiber gap is prevented. Droplets can be retained and can be prevented from penetrating to the back surface.

The thickness of the cut pile fabric is unweighted.
No pressure (7 gf / cm ² ): 3.0 mm or less, preferably 2.0 mm or less, when pressure is applied (1 kgf / cm ² ):
It is preferably 0.5 mm or more. When no weight is applied and no pressure is applied (7 gf / cm ² ): If it exceeds 3.0 mm, the activity in the worn state deteriorates, and when pressure is applied (1 kgf / cm ² ): less than 0.5 mm, The droplets easily penetrate to the back side by pressure,
When the thickness is 0.5 mm or more, the liquid droplets are retained in the liquid chemical substance protective layer and the permeation of the liquid droplets can be prevented.

The fibers constituting the cut pile cloth include olefin synthetic fibers such as polyethylene and polypropylene, polyamide fibers such as nylon 6 and nylon 66, polyester fibers such as polyethylene terephthalate and polybutylene terephthalate, vinyl chloride fibers, It is not particularly limited as long as it is a thermoplastic synthetic fiber such as vinylon fiber.

The apparent specific gravity of the cut pile fabric is 0.10.
It is preferably about 0.30. Below this range,
Inability to prevent penetration and permeation of liquid chemicals,
If it exceeds 0.30, the fabric becomes stiff and unsuitable as a material for clothes.

As the gaseous toxic chemical substance adsorption layer (b), granular or powdered activated carbon is heat-fixed and formed on the adsorbent protective layer (c) together with a thermosetting or hot-melt type adhesive. , Or specific surface area 600-250
A cloth made of 0 m ² / g of fibrous activated carbon can be mentioned. In any case, the thickness of the gaseous toxic chemical substance adsorption layer of (b) is preferably 3 mm or less in consideration of wearability, and even such a thin layer completely adsorbs and removes the gaseous toxic chemical substance. There is a need. From this point of view, in particular, the fibrous activated carbon cloth is most practical in that not only flexibility and air permeability are imparted thereto, but also the adsorption rate to the volatilized gas is extremely high. Furthermore, the fibrous activated carbon cloth exhibits a high adsorption rate even if a liquid toxic chemical substance slightly permeates through the cut pile cloth laminated on the outer surface of the fibrous activated carbon cloth. The chemical substance is easily gasified and the volatilized gasified substance is quickly adsorbed, so that it has an extremely excellent protective effect in suppressing the permeation of the liquid chemical substance in the thickness direction of the fibrous activated carbon cloth.

Examples of the fibrous activated carbon cloth include natural cellulose fibers such as cotton and hemp, regenerated cellulose fibers such as rayon, polynosic and solvent spinning method, polyvinyl alcohol fibers, acrylic fibers, aromatic polyamide fibers, and cross-linked. A synthetic fiber such as formaldehyde fiber, lignin fiber, phenolic fiber, petroleum pitch fiber can be used as a raw material. In particular,
Weaving using short fibers or long fibers of these raw fibers,
A known knitted or non-woven fabric is treated with a flameproofing agent at a temperature of 450 ° C. or lower, and then activated by carbonization at a temperature of 500 ° C. or higher and 1000 ° C. or lower, after containing an appropriate flameproofing agent if necessary. A fibrous activated carbon cloth can be produced by the method.

The raw material fibers used at this time are preferably regenerated cellulose fibers, phenolic fibers, and acrylic fibers because the obtained fibrous activated carbon has high physical properties (strength, etc.) and excellent adsorption performance. In addition, as the activation treatment, an activation gas such as steam or carbon dioxide is used for 10 to 7
It is preferable to perform heating by heating to 700 ° C. or higher in a state of containing 0% by volume. By selecting the activation temperature, time, activation gas concentration and other conditions, the specific surface area is 60
A fibrous activated carbon fabric with an arbitrary activity of 0 to 2500 m ² / g is obtained.

Examples of the form of the fibrous activated carbon cloth include a woven form, a knitted form, a non-woven form, a felt form, a paper form and the like, but it is considered in terms of breathability, ease of lamination, thinness and flexibility. Then, it is preferable that it is in a woven or knitted form. In the carbonization activation step, the raw material fibers may be carbonized and then formed into a cloth, but from the viewpoint of handling, it is preferable to carry out carbonization activation after the cloth is formed.

As the adsorbent protective layer (c), a woven or knitted fabric made of hydrophobic fibers and woven or knitted at a coarse density is used, but a tricot knitted fabric is preferable from the viewpoint of flexibility. The purpose of the adsorbent protective layer is to serve as a base fabric for adhering powdery or granular activated carbon forming the gaseous toxic chemical substance adsorption layer of (b) above, and to supplement the mechanical strength of the fibrous activated carbon fabric. Especially. Further, it also has an effect of suppressing sweating of the wearer of the protective garment, which prevents the sweat from wetting the adsorption layer and deteriorating the adsorption performance for toxic chemical substances.

In order to allow sweat vapor to easily pass to the outside of the protective clothing material, it is desirable to use a hydrophobic fiber cloth as the adsorbent protective layer in (c). If it is composed of hydrophilic fibers, the adsorbent protective layer itself absorbs sweat and absorbs water, effectively transferring heat and moisture in clothes to the outside and releasing heat.
It is not preferable because it impairs the function of releasing moisture. The hydrophobic fiber referred to here is a fiber having a water content of 3% or less at 20 ° C. and 65% RH, and examples thereof include synthetic fibers such as polyethylene, polypropylene and polyester.

As described above, the adsorbent protective layer (c) is desired to be thin and have a coarse density woven or knitted fabric, and the ratio of the bulk density of the adsorbent layer to the adsorbent protective layer is 1: 1 to 2. Preferably there is. That is, when the density of the adsorbent protective layer is lower than that of the adsorbent, sweat vapor easily comes into contact with the adsorbent layer, and the adsorbability is deteriorated. On the other hand, if it exceeds 2 times, it becomes difficult to transfer sweat vapor to the outside and wearability deteriorates.

Liquid poisonous chemical substance protective layer of (a), (b)
The gaseous toxic chemical substance adsorbing layer and the adsorbent protective layer (c) must be a laminated body in which each layer adheres to each other in order to facilitate transfer of heat and moisture during wearing. . As a laminating means, bonding by applying an adhesive, powder,
Examples of the method include adhesion using a granular material or a non-woven fabric hot melt adhesive, lamination by quilting, and combinations thereof.

As a means for laminating thinly without damaging the adsorption performance of the gaseous toxic chemical substance adsorption layer of (b), adhesion with a non-woven fabric hot melt adhesive is preferable. There are various non-woven fabric hot melt adhesives such as polyester-based, polyamide-based, vinyl acetate-based, etc.
It is preferable that the temperature is 120 ° C. or less because the bulk density of the liquid toxic chemical substance protective layer is not significantly increased at the time of heat bonding.

The pile protective layer optionally provided in the present invention is a thin woven fabric, knitted fabric or non-woven fabric, preferably a woven fabric, knitted fabric or non-woven fabric which has been subjected to water repellent / oil repellent treatment. is there. The purpose of the present pile protective layer is to suppress the adhesion of soil, mud, dust, etc. to the pile, or to prevent the pile from falling off due to catching, friction, etc. during work or damage due to abrasion. Further, there is also an effect of interfering that droplets or large droplets that are scattered directly contact the protective material and penetrate the droplets. Furthermore, an outer layer cloth, a reinforcing cloth, or the like may be arranged if necessary. FIG. 3 shows a structural example of the present invention as a schematic diagram, in which a pile protective layer is provided as the outermost layer. The apparent specific gravity of the pile protective layer is preferably 0.80 or less.
When it exceeds 0.80, the fabric has low air permeability and is unsuitable as a material for clothes.

[0026]

The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited by these examples. The evaluation method described in the examples is based on the method described below. The conditions and results of Examples and Comparative Examples are summarized in Table 1 at the end of this section.

Adsorption performance: The adsorption amount of carbon tetrachloride is determined by JIS-
It was measured by the method described in K-1474. Resistance to liquid permeation under pressure: A filter paper was placed on a glass plate, and the laminated material of the present invention was placed on the glass paper so that its pile surface faced up, and a liquid chemical substance (a red dye was dissolved therein). 3 μl of tetrachloroethane) was added dropwise. Then, a weight having a bottom area of 6 cm ² is placed on the predetermined weight (0.2 to 2.0 kgf).
/ Cm ² ) and after 1 hour, the penetration of the liquid was judged by coloring the filter paper. Water repellency: According to JIS-L-1092 5.2 spray test. Oil repellency: According to AATCC Test Method 118. Bending property: According to JIS-L-1096 6.22.2 B method (slide method). Breathability: According to JIS-L-1018 6.34. Apparent specific gravity: According to JIS-L-1018 6.9.1.

Example 1 Nylon filament yarns (70d, 24 filaments) as ground yarns and nylon filaments (220d, monofilament) as pile yarns were respectively fed by a 22 gauge 6 reed double Russell machine, and the structure of FIG. After knitting the warp knitted fabric with the yarn arrangement, it was scoured by a conventional method. After that, it was dyed with an acid dye, and then pad-dried on a solution of a fluorine-based water repellent / repellent oil processing agent (Asahi Guard AG710 manufactured by Asahi Glass Co., Ltd.), followed by curing at 160 ° C., and a resin solid content of 2.0% by weight was applied. It was Next, after half-cutting the knitted fabric into a cut pile,
The pile tip was melted by heat to form a sphere. The knitted fabric obtained in this way has a thickness of 1.88 m without pressure (7 gf / cm ² ).
m, when pressurized (1 kgf / cm ² ) thickness 0.92 mm, basis weight 310 g / m ² ,
It has an apparent specific gravity of 0.16, a bending resistance of 1.95 gf · cm, and a breathability of 1.
The pressure difference of 27 cm was 8100 cc / cm ² / min, the water repellency was 100, and the oil repellency was grade 6.

On the other hand, a plain weave composed of spun yarn of novolac-based phenolic resin fiber of 2.0 denier 20 s / 1 single yarn and having a basis weight of 85 g / m ² was heated for 30 minutes in an inert atmosphere at 410 ° C., then 87
The mixture was heated to 0 ° C for 20 minutes in an inert atmosphere to promote carbonization, and then activated by heating at a temperature of 870 ° C for 2 hours in an atmosphere containing 12% by volume of steam. The basis weight of the obtained woven fibrous activated carbon is 50 g / m ² , specific surface area 1400 m ² / g, thickness 0.40 mm,
The air permeability was 28,000 cc / cm ² / min.

On the other hand, by using a 28-gauge 2-blade tricot machine, polyester filament yarn (75 denier, 36 filaments) was fully set in the front reed and polyester filament (20 denier, monofilament) was fully set in the back reed. -2 / 1-0, back 1
After the warp knitted fabric was knitted with a structure of −0 / 2-3, it was scoured by a conventional method and further dyed with a disperse dye. The knitted fabric thus obtained has a thickness of 0.28 mm, a basis weight of 60 g / m ² , and an air permeability of 40,000 cc /
It was cm ² / min.

With the fibrous activated carbon cloth as an intermediate layer, the back surface of the tricot knitted fabric and the face opposite to the pile layer of the cut pile knitted fabric are made of a polyester non-woven thermoplastic adhesive (Kureha) having a basis weight of 20 g / m ^2. Tech Co., Ltd. Dynac ES-20
, Melting point 115 ° C.) and laminated by heating roller. The composite material thus obtained has a thickness of 2.3 m.
It had m, a basis weight of 480 g / m ² and an air permeability of 7100 cc / cm ² / min, and had sufficient air permeability, strength and flexibility as a protective material. The saturated adsorption amount of carbon tetrachloride was 45 g / m ² , and it had sufficient gas adsorption performance as a protective material.

On the other hand, the liquid permeation suppression effect of the protective material was examined. After depositing a small amount of 3 μl droplets (tetrachloroethane) on the pile layer of the protective material, a weight was placed from the upper part and the permeability was evaluated. As a result, the protective material showed a good liquid permeation suppression effect, and 1.5 kgf / Even under a pressure of ² cm2, the droplets do not permeate to the back side, but are volatilized while being held in the base pile layer, and even under the pressure of ² kgf / cm2, a small amount of exudation on the activated carbon cloth layer occurs. It was found that there was no penetration in a liquid state.

Example 2 Polyester filament yarn (50d, 24 filaments) as ground yarn by a 22 gauge 6-sheet reed double russel machine
Nylon filament (160
d, monofilaments) were respectively supplied, and the warp knitted fabric was knitted with the structure and yarn arrangement of FIG.
After heat-melting the pile tip of the knitted fabric to form a spherical object,
Fluorine-based water repellent / oil repellent processing agent was applied, and 2.0% by weight of resin solids was attached. The knitted fabric thus obtained has a thickness of 1.30 mm when unpressurized (7 gf / cm ² ) and a pressure (1 kgf / cm ² ).
cm ² ) Thickness 0.73 mm, basis weight 166 g / m ² , apparent specific gravity 0.13, bending resistance 0.82 gfcm, breathability is 2400 with pressure difference of water level gauge 1.27 cm.
The water repellency was 0 cc / cm ² / min, the degree of oil repellency was 5th grade. On the other hand, a plain fabric having a basis weight of 170 g / m ^{2 made} of a novolac-based phenol resin fiber spun yarn having a single yarn of 2.0 denier 20 s / 1 was subjected to carbonization activation in the same manner as in Example 1 to give a basis weight of 96 g / m ² ,
Specific surface area 1400m ² / g, no pressure (7gf / cm ² ) thickness 0.40mm,
Pressurization (1kgf / cm ²⁾ Thickness 0.73 mm, air permeability of 9500cc / cm ² / m
An in-woven woven fibrous activated carbon cloth was obtained.

Using the fibrous activated carbon cloth as an intermediate layer, the cut pile knitted fabric and the tricot knitted fabric described in Example 1 were laminated by the method described in Example 1. The composite material thus obtained had a thickness of 1.8 mm, a basis weight of 360 g / m ² , and an air permeability of 8000 cc / cm ² / min, and had sufficient air permeability, strength, and flexibility as a protective material. JIS K 1474 of the protective material
The saturated adsorption amount of carbon tetrachloride based on was 80 g / m ² and had sufficient gas adsorption performance as a protective material. On the other hand, as a result of examining the liquid permeation resistance of the protective material under pressure,
A slight exudation of the liquid was observed under a pressure of 1.5 kgf / cm ² , but there was no problem under a pressure of 1.0 kgf / cm ² or less.

Example 3 Polyester filament yarn (50d, 24 filaments) as ground yarn by a 22 gauge 6-sheet reed double russel machine
Nylon filament (160
d, monofilaments) were respectively supplied, and the warp knitted fabric was knitted with the structure and yarn arrangement of FIG. The knitted fabric was half-cut to obtain a cut pile. After heat-melting the pile tip of the knitted fabric to form a spherical material, a fluorine-based water repellent / repellent oil treatment agent is applied,
The resin solid content was 2.0% by weight. The knitted fabric thus obtained has a thickness of 1.03 mm when unpressurized (7 gf / cm ² ), a thickness of 0.64 mm when pressurized (1 kgf / cm ² ), a basis weight of 126 g / m ² , and an apparent specific gravity.
It had a hardness of 0.12, a bending resistance of 0.74 gf · cm, a breathability of 23500 cc / cm ² / min with a water level gauge of 1.27 cm, a water repellency of 100, and a repellency of fourth grade. The knitted fabric, the same fibrous activated carbon fabric used in Example 1 and the reinforcing tricot knitted fabric were laminated with the same adhesive used in Example 1. The composite material thus obtained has a thickness of 1.6 mm and a basis weight of 280 g.
/ m ^2, an air permeability 17000cc / cm ² / min, as the protective material had good wear resistance. On the other hand, the gas adsorption performance of the composite material was similar to that of Example 1 and was good.

On the other hand, a plain woven fabric using 40's / 1 cotton yarn was subjected to a fluorine-based water repellent / oil repellent treatment, and 3.0% by weight of resin solids was attached. The obtained woven fabric has a thickness of 0.22 mm and a basis weight of 120 g / m.
^{2. The} bending resistance was 0.56 gf · cm, the air permeability was 3500 cc / cm ² / min with a pressure gauge of 1.27 cm, the water repellency was 100, and the oil repellency was grade 5.

The protective material was piled up on the woven fabric as a pile protective layer, and the liquid permeation resistance under pressure was examined. As a result, the liquid slightly exudes under pressure of 1.5 kgf / cm ^2. Was observed, but there was no problem under a pressure condition of 1.0 kgf / cm ² or less.

Comparative Example 1 Polyester filament yarn (50d, 24 filaments) as the base yarn by a 22 gauge 6 reed double russel machine
Nylon filament (160
d, monofilaments) were respectively supplied, and the warp knitted fabric was knitted with the structure and yarn arrangement of FIG. After half-cutting the knitted fabric into a cut pile, it was treated with a fluorine-based water repellent / repellent processing agent, and 2.0% by weight of the resin solid content was adhered. The knitted fabric obtained in this way has a thickness of 1.40 mm when unpressurized (7 gf / cm ² ),
When pressurized (1 kgf / cm ² ) thickness 0.70 mm, basis weight 125 g / m ² , apparent specific gravity 0.089, bending resistance 0.75 gf · cm, breathability 1.27
The pressure difference in cm was 21700 cc / cm ² / min, the water repellency was 100, and the oil repellency was grade 4. The knitted fabric, the same fibrous activated carbon cloth as used in Example 1, and a reinforcing tricot knitted fabric,
Laminated with the same adhesive used in Example 1. The composite material thus obtained had a thickness of 1.8 mm, a basis weight of 280 g / m ² , and an air permeability of 16500 cc / cm ² / min, and had good wearability as a protective material. On the other hand, the gas adsorption performance of the composite material was as good as the result of Example 1, but the liquid permeation resistance under the pressurized condition was poor, and the back surface was easily backed up even under the pressurized condition of 0.2 kgf / cm ^2. It was impractical because the droplets penetrated.

Comparative Example 2 Nylon filament yarn (70 denier, 17 filaments) was used for the front reed by a 28-gauge double reed tricot machine.
, And nylon filament (20 denier, monofilament) is fully set in the back reed, and the warp knitted fabric is knitted with the structure of front 1-2 / 1-0 and back 1-0 / 2-3 in the MD direction. Was stretched to give a loop pile and made into a French pile, and then treated with a fluorine-based water repellent / repellent processing agent, and 2.0% of the resin solid content was attached.
The knitted fabric thus obtained has no pressure (7 gf / cm ² )
Thickness 1.18 mm, when pressurized (1 kgf / cm ² ) Thickness 0.26 mm, basis weight 14
5g / m ² , apparent specific gravity of 0.12, bending resistance of 0.65gf ・ cm, breathability of 15000cc / cm ² / min with pressure difference of water gauge 1.27cm, water repellency of 100, oil repellency of It was 7th grade. Example 2 of the knitted fabric
The same fibrous activated carbon fabric used in Example 1 and the reinforcing tricot knit fabric were laminated with the same adhesive used in Example 2. The composite material thus obtained had a thickness of 1.7 mm, a basis weight of 350 g / m ² , and an air permeability of 6600 cc / cm ² / min. The gas adsorption performance of the composite material was similar to the result of Example 2, but the liquid permeation resistance under the pressure condition was poor, and even under the pressure condition of 0.2 kgf / cm ² , it was easy to reach the back surface. The droplet penetrated.

Comparative Example 3 The cut pile knitted fabric used in Example 2 was processed in the same manner as in Example 2 except that the water repellent / repellent oil process was not performed. This cut pile knitted fabric has a thickness of 1.30 mm, a basis weight of 162 g / m ² , an apparent specific gravity of 0.13, a bending resistance of 0.82 gfcm, and a breathability of 24000 cc / cm ² / mi.
n, water repellency 50, and repellency second grade.

The cut pile knitted fabric, the fibrous activated carbon woven fabric used in Example 2 and the tricot knitted fabric used in Example 1 were treated by the method described in Example 1 using a non-woven adhesive.
Adhesive lamination was performed by a laminating method. The resulting laminated fabric is
It had a thickness of 1.8 mm, a basis weight of 360 g / m ² , and an air permeability of 8000 cc / cm ² / min, and had sufficient air permeability, strength, and flexibility as a protective material. The saturated adsorption amount of carbon tetrachloride based on JIS K 1474 of the protective material was 80 g / m ² , and the protective material had sufficient gas adsorption performance. On the other hand, as a result of examining the liquid permeation resistance of the protective material under pressure, it was not practical because the droplet easily penetrated to the back surface even under the pressure of 0.2 kgf / cm ² .

[0042]

[Table 1]

[0043]

Industrial Applicability According to the present invention, the protective clothing material is excellent in protection against toxic chemical substances, especially in permeation and penetration prevention of liquid chemical substances under pressure, and in which wearability such as feeling of heat and dampness during wearing is small. Can be provided.

[Brief description of drawings]

FIG. 1 is a structural diagram of pile cloths of Examples 1 and 2.

FIG. 2 is a structural diagram of a pile cloth of Comparative Example 1.

FIG. 3 is a schematic cross-sectional view of a material for protective clothing according to the present invention.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hiroo Fukui 2-1-1 Katata, Otsu-shi, Shiga Toyobo Co., Ltd. Research Institute (72) Inventor Shozo Ota 2-1-1 Katata, Otsu, Shiga Toyobo Co., Ltd. Research Institute (72) Inventor Shoichi Kawai 2-2-8 Dojimahama, Kita-ku, Osaka Toyobo Co., Ltd.

Claims (3)

[Claims] 1. A liquid toxic chemical substance protective layer, which is a protective clothing material comprising a laminated structure of a gaseous toxic chemical substance adsorption layer and an adsorbent protective layer, wherein the liquid toxic chemical substance protective layer is composed of a cut pile cloth. At the same time, the pile yarn constituting the cut pile fabric has a fineness:
It is made of synthetic fiber filament yarn which is a monofilament of 50 to 350 denier, and has a water repellency of 80 or more, a repellency of oil of 4 grade or more, and an apparent specific gravity of 0.10 to 0.30. The tip of the cut pile fabric has a spherical shape by heat melting, and the thickness of the cut pile fabric is 7 gf / cm ² when loaded:
3.0 mm or less, 1 kgf / cm ² weighted: 0.5 mm or more, protective clothing material. 2. The protective clothing material according to claim 1, wherein the gaseous toxic chemical substance adsorption layer is composed of a fibrous activated carbon cloth. 3. The material for protective clothing according to claim 1, wherein a pile protective layer is arranged outside the liquid toxic chemical substance protective layer.