JP2020084347A - Heat resistant protective wear - Google Patents

Abstract

To provide a light heat resistant protective wear which has fire retardancy, waterproofness and heat shielding property and is superior in wearing feeling.SOLUTION: A heat resistant protective wear comprises: a surface layer having fire retardancy; an intermediate layer having moisture permeable waterproofness; and a heat shielding layer having heat shielding property. The heat shielding layer has a thickness specified by a JIS L1096A method of 1 mm or more, has a mass per unit area specified by the JIS L1096A method of 150 g/mor more, and has ground weaves and pattern structures. In the pattern structure, at least three or more fibers with fineness of 300 dtex or more and 1,300 dtex or less are laminated in a thickness direction.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a heat-resistant protective suit that has flame retardancy, waterproofness, and heat shielding properties, is lightweight, and has excellent wearing feeling.

Conventionally, a heat-resistant protective suit having a heat-shielding layer having heat-shielding properties by forming a sufficient air layer (dead air) has been proposed. For example, in Patent Document 1 and Patent Document 2, by interposing a spacer member between the intermediate layer (intermediate layer) and the lining, the mutual contact area between the intermediate layer and the lining is reduced and an air layer is formed. ..

However, the heat-resistant protective suit of the prior art has a large weight, the air layer is insufficient, and there is room for further improvement in flexibility.

JP, 6-68578, A US07/858727 Specification

TECHNICAL FIELD The present invention relates to a heat-resistant protective suit having excellent flame retardancy, heat shielding properties, and breathability.

As a result of earnest studies for achieving the above-mentioned problems, the present inventor has found that a fabric excellent in flame retardancy, heat shielding property and air permeability can be obtained by laminating at least three or more fibers of the handle structure of the heat shielding layer. The present invention has been completed by discovering the above and further conducting intensive studies.

The present invention has a surface layer having flame retardancy, a moisture-permeable intermediate layer, and a heat-shielding layer having a heat-shielding property, and the heat-shielding layer has a thickness specified by JIS L 1096A method. 1 mm or more, the mass per unit area defined by the JIS L 1096A method is 150 g/m ² or more, and has a ground structure and a pattern structure, and the pattern structure has fibers having a fineness of 300 dtex or more and 1300 dtex or less. At least three or more layers are laminated in the thickness direction. Further, it is preferable that the surface layer includes meta-aramid fiber and para-aramid fiber, the heat shield layer includes meta-aramid fiber and para-aramid fiber, and the ground structure is English cotton count 40 to 10 count. It is also preferable that it is not more than 148 dtex and not more than 600 dtex.

According to the present invention, it is possible to obtain a heat-resistant protective suit which is flame-retardant, waterproof, and heat-shielding and is lightweight and has excellent wearing comfort.

It is explanatory drawing of the ground structure used for Examples 1-3. FIG. 3 is an explanatory diagram of a handle structure used in Example 1. FIG. 6 is an explanatory diagram of a handle structure used in Example 2. FIG. 9 is an explanatory diagram of a handle structure used in Example 3; It is explanatory drawing of the fabric structure used for the comparative example 1.

Hereinafter, embodiments of the present invention will be described in detail.
The heat-resistant protective suit of the present invention has a structure in which three layers of a surface layer, an intermediate layer and a heat shield layer are laminated in this order. The surface layer is flame retardant, the intermediate layer is moisture permeable and waterproof, and the heat shield layer is It has heat-shielding properties, and both of these are para-type aramid fibers and meta-type aramid fibers, which are used alone or as a mixture, but as other heat-resistant fibers that can be mixed and used, polybenzimidazole fiber, polyimide fiber , Polyamideimide fiber, polyetherimide fiber, polyarylate fiber, polyparaphenylene benzobisoxazole fiber, novoloid fiber, flame-retardant acrylic fiber, polyclar fiber, flame-retardant polyester fiber, flame-retardant cotton fiber, flame-retardant rayon fiber, flame-retardant vinylon Fibers and flame-retardant wool fibers can be mentioned.

The outer layer of the present invention is composed of a cloth composed of meta-aramid fiber and/or para-aramid fiber, and the kind of cloth is at least one selected from the group consisting of woven fabric, knitted fabric and non-woven fabric, and is practically used. From the viewpoint of strength, it is preferable to use a woven or knitted fabric.

The meta-aramid fiber and the para-aramid fiber can be used in the form of filaments, mixed yarns, spun yarns, and the like in the surface layer, but it is preferable to use them in the form of spun yarns by mixing and spinning. The mixing ratio of the para-aramid fiber is preferably 1 to 70% by weight based on the total weight of the fibers constituting the outer layer. When the mixing ratio of the para-aramid fiber is less than 1% by weight, the fabric may be broken, that is, may have holes when exposed to a flame. When the mixing ratio exceeds 70% by weight, the para-aramid fiber may be broken. It is not preferable because it is fibrillated and wear resistance is reduced. The outer layer may be single ply or double ply.

Further, the surface layer is processed by applying a fluorine-based water repellent resin by a processing method such as a coating method, a spray method, or a dipping method, which has higher water resistance and chemical resistance. Preferred for obtaining protective clothing.

The intermediate layer of the present invention, using a meta-aramid fiber, para-aramid fiber, a combination of meta-aramid fiber and para-aramid fiber, etc., can be woven into a texture such as plain weave, twill, and double weave. preferable. At this time, the weight of the intermediate layer is preferably 50 to 200 g/m ² . If it is less than 50 g/m ^2, spun yarn is unfavorable, because if the tension is applied in the weaving process such as weaving, refining, and setting, the strength may be decreased and the fibers may slip out. Moreover, when it exceeds 200 g/m ² , it is heavy and unfavorable when worn. Further, the fibers constituting the cloth may be spun yarn or filament, and may be in the form of woven fabric, knit fabric or non-woven fabric.

Moreover, it is preferable that the intermediate layer has a moisture-permeable waterproof layer. As the moisture-permeable waterproof layer, a moisture-permeable waterproof property can be obtained by laminating a polytetrafluoroethylene film or the like having a moisture-permeable waterproof function, or by laminating a polyurethane porous layer. By inserting such an intermediate layer, moisture permeability and water resistance and chemical resistance are improved and evaporation of sweat of the wearer is promoted, so that heat stress of the wearer can be reduced.

The heat-shielding layer of the present invention preferably contains 80% or more of aramid fiber, and when it is less than 80%, the heat resistance decreases, which is not preferable. Further, it is preferable that the heat shield layer has a warp knitting structure composed of a ground structure and a pattern structure containing at least one kind of meta-aramid fiber and para-aramid fiber as aramid fiber. Materials other than aramid fibers include polyester fibers, cotton fibers, rayon fibers, vinylon fibers, and wool fibers. However, the mixing ratio is preferably less than 20%. Further, it is preferably 15% or less. When it is 20% or more, an afterflame may be seen or may be melted during the test of JIS L 1091 A-4 method or JIS L 1091 A-1 method.

In addition, the ground structure of the heat shield layer is preferably a combination of chain knitting and insertion structure and has an English cotton count of 40 or less and 10 or more, or a fineness of 148 dtex or more and 600 dtex or less, and further, an English cotton count of 20. It is preferable that the number is 10 or more and the fineness is 295 dtex or more and 600 dtex or less. By using these yarns, excellent dimensional stability, strength retention, and weight reduction can be obtained.

Further, the handle structure of the heat shield layer has at least three yarns with a fineness of 300 dtex or more and 1300 dtex or less, and more preferably 3 or more and 8 or less, and the yarns are inserted from the heat shield layer side toward the intermediate layer side by the insertion structure. It is preferable to vertically stack (laminate), and it is more preferable to be 400 dtex or more and 1200 dtex or less. By doing so, an air layer is formed between the heat shield layer and the intermediate layer, and heat shield properties can be obtained.

The thickness of the heat shield layer defined by JIS L 1096A method is preferably 1 mm or more, more preferably 1.1 mm or more.

In order to obtain the above-mentioned heat shield layer (heat shield warp knit), a Raschel knitting machine having two or more ground guide bars for knitting the ground structure and three or more pattern guide bars for constructing the pattern structure is preferably used. .. The gauge number is preferably 28 G or less, more preferably 22 G or less, depending on the fineness of the pattern yarn. The knitted fabric can give flexibility to the heat shield layer.

Thermally protective clothing weight of the present invention is preferably 420~520g / ^{m 2,} it is less than 420 g / ^{m 2,} an approach A specification of ISO11613, Flame-resistant test (ISO9151), resistance radiant heat test (ISO6942) It becomes difficult to meet the specifications of 13 seconds or more and 18 seconds or more, respectively. On the other hand, if it exceeds 520 g/m ² , the weight of the protective suit is increased and the movement of the wearer is hindered.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto. In addition, each physical property in an Example is measured by the following method.
(1) Density Measured by JIS L 1096 A method.
(2) Unit weight (mass per unit area)
It was measured by the JIS L 1096 A method.
(3) Thickness Measured according to JIS L 1096 A method.
(4) Tensile strength Measured according to JIS L 1096 A method.
(5) Tear strength It was measured by JIS L 1096 D method (Pendulum method).
(6) Heat transfer property By the ISO 6942-2002 B method, the time t24 (second) required for the temperature rise of 24±0.2° C. at the incident heat flux density of 40 kW/m ² was measured.

The following materials were used to produce spun yarns shown in Tables 1 and 2 by a known method.
"Meta-type wholly aromatic polyamide fiber primary monofilament (meta aramid)" manufactured by Teijin Limited, "Conex" (registered trademark), average single fiber fineness 1.7 dtex, fiber length 51 mm
"Para type wholly aromatic polyamide short fiber (para aramid)" manufactured by Teijin Limited, "Technora" (registered trademark), average single fiber fineness 1.7 dtex, fiber length 51 mm

[Examples 1 to 3]
As shown in Table 1 for the outer fabric layer and the intermediate layer, raw cotton fiber was used to obtain spun yarn of each count and fineness, and weaving was performed at each density and texture, conventional fried and scouring. The intermediate layer was laminated with a moisture-permeable waterproof film made of polytetrafluoroethylene.

As shown in Table 2 for the heat-shielding layer, raw cotton fiber was used to obtain spun yarn of each count and fineness, and a 22G Jacquard Raschel machine was used to show the ground structure in FIG. 1 and the respective pattern structures in FIG. The knitting was carried out with the structures shown in FIGS. 3 and 4, and conventional fried and scouring were performed.

Table 4 shows the results of evaluation of the fabric by laminating the obtained outer fabric layer and the intermediate layer, and laminating the heat shielding layer so that the pattern structure is on the intermediate layer side to form three layers. The obtained cloth was excellent in heat resistance and heat conductivity, lightweight, excellent in flexibility, and had exceptional performance as a heat resistant protective suit.

[Comparative Example 1]
As shown in Table 3 and FIG. 4, the heat shield layer was obtained by using spun yarn of each count and fineness using raw cotton fiber, and weaving it with each density and texture, performing conventional roasting and scouring. Table 4 shows the results of fabric evaluation and fabric evaluation performed in the same manner as in Examples 1 to 3. The obtained cloth was excellent in heat resistance and heat conductivity, but was slightly heavy and had general performance as a heat protection suit.

The heat-resistant protective clothing of the present invention is not only excellent in chemical resistance and moisture permeation and waterproof properties, but also has high heat-shielding properties, light weight, and flexibility, so it is useful as heat-resistant protective clothing such as fire-fighting clothing and fire-proof clothing. is there.

Claims (3)

It has a surface layer having flame retardancy, an intermediate layer having moisture permeability and waterproof property, and a heat shield layer having heat shield property, and the heat shield layer has a thickness of 1 mm or more specified by JIS L 1096A method, and JIS. The mass per unit area defined by the L 1096A method is 150 g/m ² or more, and has a ground structure and a pattern structure, and the pattern structure has at least fibers having a fineness of 300 dtex or more and 1300 dtex or less in the thickness direction. A heat-resistant protective garment that is characterized by stacking three or more layers. The heat-resistant protective suit according to claim 1, wherein the outer layer comprises meta-aramid fiber and para-aramid fiber. The heat-resistant protective suit according to claim 1 or 2, wherein the heat-shielding layer contains meta-aramid fiber and para-aramid fiber, and the ground structure is English cotton count 40 or more and 10 or less, or 148 dtex or more and 600 dtex or less. ..

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