JPH11267244A - Protective clothing material for toxic gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the influence of moisture, to improve toxic gaseous material penetration preventive efficiency and air permeability and to suppress a hot feel and moist feel by tightly adhering protective layers on both sides of an active carbon cloth layer consisting of fibrous active carbon of a specific amt. or below on an acidic base quantity existing on the surface, thereby constituting the protective clothing material. SOLUTION: The active carbon cloth 5 is formed by the fibrous active carbon of <=0.2 millequivalent/g per unit weight of the fibrous active carbon in the acid base quantity existing on the surface. The protective layers 4 are laminated on both sides of such active carbon cloth 5 in tight contact therewith. The laminated layers may be formed by bonding, etc., by adhesives. The protective layers 4 provide the protection of the active carbon cloth layer 5. If, for example, the protective clothing material is formed, other functions such as liquid toxic chemical material protective performance is preferably imparted to the material. The material may be hardly affected by the moisture and the protective property may be improved by such constitution.

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 provided to protective clothing for protecting workers in handling toxic gas substances, and more particularly, to the use of pesticide spraying, or the production or use of chemicals. The present invention relates to a material to be provided to protective clothing for protecting workers in a work of handling a toxic gas substance which is absorbed from the skin such as a chemical emitting toxic gas and has an adverse effect on the human body.

[0002]

2. Description of the Related Art Various types of protective clothing for protecting the human body from toxic chemicals have been proposed. For example, there is a material made of a material through which a toxic gas substance does not penetrate, such as a rubberized cloth, and has excellent protection performance. However, in such a case, the weight of the fabric is heavy and the workability when worn is inferior, and since there is no air permeability, heat stress is applied in a hot environment or in a work requiring physical exercise, and a great deal of work is given to the worker. It is a burden.

Japanese Unexamined Patent Publication (Kokai) No. 57-156036 or Japanese Unexamined Patent Publication (Kokai) No. 2-190328 exemplifies a laminated fabric for protective clothing using an activated carbon fabric. Activated carbon originally has a non-polar surface, but the activated carbon fabric surface here uses an oxidizing gas or atmosphere during the activation process and is stored in the air. A proportion is covered with oxide, creating a polar surface. As a result, such activated carbon fabrics tend to adsorb moisture due to sweat diverging from the use environment and the human body, causing a problem of lowering the original adsorption activity, that is, the protective performance.

[0004] Japanese Patent Application Laid-open No.
-77508 exemplifies a hydrophobic activated carbon material and a method for producing the same. The activated carbon material used in the liquid phase is used in the gas phase as a material for protective clothing. Not suitable for

[0005] Japanese Patent Publication No. 3-33342 discloses that activated carbon is hydrophobized by surface modification, but the activated carbon here is used in a liquid phase, as described above. Not suitable for use in the gas phase. Furthermore, since activated carbon is granular, it tends to be powdered and thus has insufficient durability.

[0006] JP-A-5-253435 or JP-A-Hei-6
No.-92614 discloses that activated carbon is hydrophobized by heat treatment. However, the activated carbon used here is granular activated carbon and is not easily used as a material for protective clothing in terms of powdering and durability. It is enough.

[0007]

DISCLOSURE OF THE INVENTION The present invention is hardly influenced by the environment of use and the moisture caused by sweat radiating from the human body, efficiently prevents the penetration of toxic gas substances, has excellent air permeability, and can be worn even when worn. It is an object of the present invention to provide a protective clothing material having less heat and stuffiness and an adsorbent used for the protective clothing material.

[0008]

That is, the present invention relates to a protective clothing material for toxic gas comprising an activated carbon fabric layer made of fibrous activated carbon and protective layers adhered to both surfaces of the activated carbon fabric layer. The amount of acidic groups present on the surface of the fibrous activated carbon is 0.2 milliequivalent / g per unit weight of the fibrous activated carbon.
The present invention provides the following protective material for toxic gas.

In a preferred embodiment of the present invention, the basis weight of the activated carbon fabric layer is 150 g / m ² or less.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The fibrous activated carbon used in the toxic gas protective clothing material of the present invention has an acidic group amount on the surface of 0.2 milliequivalent / g per unit weight of the fibrous activated carbon.
It is as follows. If it exceeds 0.2 milliequivalents / g, moisture is adsorbed on the surface of the pores of the activated carbon, and the original adsorbing activity for the target compound is reduced.

The above-mentioned amount of acidic groups means the total amount of acidic functional groups such as carboxyl groups and phenolic hydroxyl groups present on the surface of activated carbon, and is determined by the following measuring method in the present invention.

To about 1 g of the dried fibrous activated carbon, 60 mL of a 0.1N NaOH solution is added and shaken at 25 ° C. for 2 hours or more. Then, the mixture was filtered through a glass filter, and the filtrate 25
mL is titrated with a 0.1 N HCl standard solution, and the amount of acidic groups is calculated by the following formula. At the time of titration, phenolphthalein is used as an indicator. Amount of acidic group = ((D−V) × 60 × K) / (W × 25) D: Titration without sample (blank test) V: Test titration K: 0.1N HCl standard solution Normality W: Sample weight

The method of obtaining an activated carbon fabric made of fibrous activated carbon satisfying the above-mentioned acidic group content is not particularly limited. For example, a method of performing heat treatment in an inert gas or reducing gas atmosphere or a method of producing trimethylchlorosilane vapor Alternatively, a method of treating with a solution may be used. Among them, the method of heat treatment in nitrogen is most preferable because it is most easily manufactured.

The raw material of the activated carbon fabric used for the protective clothing material for toxic gas of the present invention is not particularly limited.
For example, in addition to natural cellulose fibers such as cotton and hemp, regenerated cellulose fibers such as rayon, polynosic, and solvent spinning methods, as well as polyvinyl alcohol fibers, acrylic fibers, aromatic polyamide fibers, cross-linked formaldehyde fibers, lignin fibers, and phenolic fibers And synthetic fibers such as petroleum pitch fibers. Of these, regenerated cellulose fibers, phenolic fibers, and acrylic fibers are preferable in view of the physical properties (strength, etc.) and adsorption performance of the obtained fibrous activated carbon.
Weaving using short fibers or long fibers of these raw fibers,
Knitting, after adding an appropriate flameproofing agent to the cloth made into a nonwoven fabric as necessary, subjecting the fabric to a flameproofing treatment at a temperature of 450 ° C or less, and then activating carbonization at a temperature of 500 ° C or more and 1000 ° C or less. The method produces an activated carbon fabric.

The activated carbon cloth used for the protective clothing material for toxic gas of the present invention may be in any form such as woven, knitted, non-woven, felt, paper, etc. It is preferable to use a knitted fabric in terms of workability, body fit, and durability.

The protective clothing material for toxic gas of the present invention needs to be composed of the above-mentioned activated carbon fabric layer and a protective layer adhered to both surfaces of the activated carbon fabric layer. This is to facilitate the transfer of heat and moisture when worn. Examples of the laminating means include lamination by applying an adhesive, thermal bonding with a hot-melt adhesive in the form of powder, granules or non-woven fabric, lamination by quilting, and a combination thereof.

The protective layer of the protective clothing material for toxic gas of the present invention is for protecting the activated carbon fabric layer, but when it is used as a protective clothing material, it has another additional function, for example, a liquid on one side of the protective layer. By providing the toxic chemical substance protection performance, the protective clothing material can be protected against gaseous and liquid chemical substances, which is a preferable embodiment.

When one side of the protective layer of the protective clothing material for toxic gas of the present invention is provided with a liquid toxic chemical protective property, the layer has a water repellency of 80 or more and a repellency of 4 grade or more. Woven fabric, knitted fabric or non-woven fabric is preferred, and tricot knitted fabric or double Russell knitted fabric is preferred in terms of flexibility. Here, the water repellency is measured by a water repellency test (spray test) according to JIS L 1092, and the oil repellency is AATCC Test Method.
Tested by 118. Water repellency is 80
If the oil content is less than or less than quaternary, the liquid substance easily penetrates and may harm the human body. To obtain a water repellency of 80 or more and a water repellency of quaternary or higher, it is possible to treat the fabric with a fluorine-based water repellent oil agent.

When the above additional functions are provided, it is necessary to consider the feeling and weight of the toxic gas protective clothing material. This is because if the texture becomes stiff or the weight increases, the fit to the body and the feeling of wearing deteriorate, which is not preferable as a material for protective clothing.

Therefore, when one side of the protective layer is provided with a protective performance against a liquid toxic chemical substance, the apparent specific gravity of the protective layer is 0.10.
It is preferably about 0.30. The apparent specific gravity is calculated according to JIS L 1018 6.9.1. If it is less than 0.10, penetration and permeation of the liquid chemical cannot be prevented, and if it exceeds 0.30, the fabric becomes stiff and unsuitable as a material for clothes.

As the protective layer on the side in contact with the wearer of the protective clothing, it is preferable to use a thin or coarsely woven or knitted woven fabric or knitted fabric made of a hydrophobic fiber. Therefore, a tricot knitted fabric is more preferable.

The activated carbon fabric used for the toxic gas protective clothing material of the present invention preferably has a compound permeation amount of 1 ppm or less by the following gas permeability test method up to 24 hours. When the content is 1 ppm or less, the material is less susceptible to the influence of moisture due to the use environment and sweat radiating from the human body, and the adsorption activity is not reduced by the moisture. If it exceeds 1 ppm, the permeation of toxic gas becomes large and the protective performance is low, which is not preferable as a protective clothing material.

<Gas Permeability Test Method>
25 ° C x 6 in two glass cells of 50cc and 350cc
The test specimen conditioned at 5% RH is sandwiched and the periphery is sealed. From the upper cell (150 cc) of this test container, methoxybutyl acetate was dropped on the test sample at a total of 50 μL at 5 points in 10 μL increments. This was put in a constant temperature box of 25 ± 2 ° C., and after 1, 3.5, 5, 8, and 24 hours from the start of the test, 0.5 cc from the sampling section of the lower cell (350 cc).
Sampling is performed and the gas concentration permeating the test sample is measured by gas chromatography.

The activated carbon fabric used for the toxic gas protective clothing material of the present invention has a dry mass per unit area of 150 g /
If m ² or less preferred. If it exceeds 150 g / m ² , the material to be provided for protective clothing is undesirably heavy. In addition, dry mass is JIS L109
6 in accordance with Example 1.

[0025]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

The toluene equilibrium adsorption amount is JIS K147.
7 was determined. The equilibrium adsorption amount of toluene whose vapor concentration was reduced to 1/10 of the saturation concentration was measured.

Example 1 A knitted activated carbon cloth was prepared, and an activated carbon cloth having a dry mass per unit area, an acidic group amount and a toluene equilibrium adsorption amount as shown in Table 1 was obtained. A protective garment material for toxic gas as shown in FIG. 1 was obtained by sandwiching both sides of an activated carbon fabric between protective layers and forming a laminated structure by quilting. Table 2 shows the results of the gas permeability test using the protective clothing material for toxic gas.

Comparative Example 1 An activated carbon fabric having a dry mass per unit area, an amount of acidic groups and an equilibrium adsorption amount of toluene as shown in Table 1 was prepared and sandwiched between protective layers to obtain a protective material for a toxic gas having a laminated structure. Was. Table 2 shows the results of the gas permeability test using the protective clothing material for toxic gas.

Comparative Example 2 An activated carbon cloth having a dry mass per unit area, an amount of acidic groups and an equilibrium adsorption amount of toluene as shown in Table 1 was prepared, and a protective layer for a toxic gas having a laminated structure sandwiched by protective layers was obtained. Was. Table 2 shows the results of the gas permeability test using the protective clothing material for toxic gas.

[0030]

[Table 1]

[0031]

[Table 2]

In Example 1, as a protective clothing material, in a gas permeation test, the permeation gas concentration of methoxybutyl acetate after 25 hours in an environment of 25 ° C. × 65% RH was 1 ppm or less, so that it was hardly affected by moisture. It can be said that it has excellent protection.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a test container used for a gas permeability test method.

FIG. 2 is a perspective view showing a fibrous activated carbon cloth-containing material for adsorbing toxic gas having a laminated structure in which both surfaces of the activated carbon cloth are sandwiched by protective layers.

[Explanation of symbols]

 Reference Signs List 1 upper cell (150 cc) 2 test item 3 lower cell (350 cc) 4 protective layer 5 activated carbon fabric 6 quilted yarn

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B01D 53/81 D03D 1/00 Z B32B 5/02 B01D 53/34 A D03D 1/00 D06M 17/00 Z D06M 17/00

Claims (2)

[Claims] 1. A protective clothing material for toxic gases comprising an activated carbon fabric layer made of fibrous activated carbon and a protective layer adhered to both surfaces of the activated carbon fabric layer, wherein the acidic group present on the surface of the fibrous activated carbon is provided. A protective clothing material for toxic gas, characterized in that the amount is 0.2 milliequivalent / g or less per unit weight of fibrous activated carbon. 2. The activated carbon fabric layer has a basis weight of 150 g.
/ M ² or less, the protective clothing material for toxic gas according to claim 1, characterized in that: