JP5400459B2 - Heat-resistant protective clothing - Google Patents

Description

  The present invention relates to a heat-resistant protective garment, and more particularly, to a heat-resistant protective garment that not only has excellent chemical resistance and moisture-permeable waterproof properties, but also has high heat shielding properties, light weight, and flexibility.

  The purpose of preventing radiant heat from fabrics made of flame-retardant organic fibers such as aramid fibers, polyphenylene sulfide fibers, polyimide fibers, and polybenzimidazole fibers as the fibers that make up heat-resistant protective clothing worn by firefighters during fire fighting In many cases, the surface of metal aluminum is processed by coating or vapor deposition. In recent years, the prevention of radiant heat has also become a very important characteristic, and the international standard ISO11613 approach A that defines the minimum performance requirements for protective clothing for fire brigade includes the flame test (ISO 9151) and the radiant heat test (ISO 6942). ) Is described as 13 seconds or more and 18 seconds or more, respectively.

  In addition to heat resistance, in order to prevent heat stroke etc. due to heat stress in summer work, in recent years, means such as using ice packs for the inner layer or ensuring air permeability by sewing have been used. ing. In particular, weight reduction is a means for reducing heat stress, and various studies have been made in the past.

  As such heat-resistant protective clothing, for example, Japanese Patent No. 3888861 discloses a protective clothing composed of a surface layer and a lining layer made of aramid fibers, and the protective clothing is required for a fire resistance test (ISO 9151). Although it is also shown that the performance is satisfied, the protective clothing has a two-layer structure, and the lining layer has a structure that is thinner than the outer layer, so the required performance of the radiant heat test (ISO6942) There was a problem that it was not possible to satisfy this sufficiently.

  In addition, Japanese Patent No. 3768359 discloses a protection in which a heat insulating layer having a three-layer structure includes an expansion agent made of a hollow element formed of an organic polymer that expands by heat in order to improve heat insulating properties and heat stress. Although the clothing is disclosed, the protective clothing also has a structure in which the lining layer is thinner than the outer layer, so that the required performance of the radiant heat test (ISO6942) for the increase in the overall thickness of the protective clothing However, since the swelling agent is supported by coating or dipping method, there is a problem that durability due to washing is a concern.

Japanese Patent No. 3888861 Japanese Patent No. 3768359

  The present invention has been made against the background of the above-described prior art, and its purpose is to provide a heat-resistant protective clothing having high heat shielding properties, light weight, flexibility, and excellent chemical resistance and moisture permeability and waterproofness. There is to do.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors, in the protective clothing composed of a surface layer, an intermediate layer, and a heat shield layer, when the heat shield layer is composed of aramid fibers and polyester fibers, It was determined that the desired heat-resistant protective clothing can be obtained.

Thus, according to the present invention, a heat-resistant protective clothing comprising a surface layer, an intermediate layer, and a thermal barrier layer, the thermal barrier layer simultaneously satisfies the following requirements (1) to (3), and The heat resistance is characterized in that the afterflame specified in JIS L A-4 method is within 2 seconds, and in the radiant heat resistance test specified in ISO 6942, the time RHTI ₂₄ until the sensor temperature rises by 24 ° C. is 18 seconds or more. Sex protective clothing.
(1) The heat shielding layer contains aramid fibers and polyester fibers, and the mixing ratio is 60/40 to 95/5.
(2) The coverage of the polyester fiber by the aramid fiber is 50% to 90%.
(3) The thickness prescribed in JIS L 1018 (for hair knitted fabric) is 2 mm or more.
Is provided.

  According to the present invention, in each layer of heat-resistant protective clothing composed of a composite fabric having a three-layer structure composed of a surface layer, an intermediate layer, and a heat shielding layer, it is possible to efficiently secure an air layer and delay heat conduction. Therefore, protective clothing having sufficient performance can be obtained not only in the afterflame test but also in the radiant heat resistance test.

It is an organization chart showing an example of the woven structure of the heat-resistant protective clothing of the present invention.

Hereinafter, the present invention will be described in detail.
The fabric for heat-resistant protective clothing of the present invention has a structure in which three layers of a surface layer, an intermediate layer, and a heat shield layer are superposed in this order, and among these layers, the heat shield layer is made of heat-resistant fibers such as aramid fibers. It is comprised from the heat resistant fabric used as the main constituent fiber. As this heat-resistant fiber, para-type aramid fiber, meta-type aramid fiber, etc. are used alone or in combination, but other heat-resistant fibers that can be used include polybenzimidazole fiber, polyimide fiber, polyamide-imide 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 fiber, flame retardant wool Fiber.

Moreover, it is preferable that a surface layer and an intermediate | middle layer are also comprised from the heat resistant fabric which uses the said heat resistant fiber as the main component fiber.
First, the surface layer will be described. The surface layer is preferably composed of a fabric composed of meta-aramid fibers and para-aramid fibers, and the woven or knitted fabric and the nonwoven fabric are used as the type of the fabric. It is preferable to do.

  The meta-aramid fibers and para-aramid fibers can be used in the form of filaments, blended yarns, spun yarns, etc., but those that are blended and used in the form of spun yarns are preferred. The mixing ratio of the para-aramid fibers is preferably 1 to 70% by weight with respect to the total weight of the fibers constituting the surface layer. If the mixing ratio of the para-aramid fibers is less than 1% by weight, the fabric may be broken, that is, pierced when exposed to a flame. If the mixing ratio exceeds 70% by weight, the para-aramid fibers It is not preferable because it is fibrillated and wear resistance is lowered.

The surface layer may be single ply or double ply.
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, so that it has higher water resistance and chemical resistance. It is preferable to get clothes.

  The intermediate layer of the present invention preferably has moisture permeability and waterproof properties, and most preferably used is a laminate of a moisture permeable and waterproof thin film on a woven fabric made of meta- or para-aramid fibers. In particular, a thin film made of polytetrafluoroethylene having moisture permeability and waterproofing is used as the optimum intermediate layer using a woven cloth made of a meta-aramid fiber such as polymetaphenylene isophthalamide which is a flame retardant material. The thing which laminated the film is illustrated.

By inserting such an intermediate layer, moisture permeability and chemical resistance and chemical resistance are improved and the sweating of the wearer is promoted, so that the heat stress of the wearer can be reduced.
The fiber constituting the fabric may be a spun yarn or a filament, and the form may be a woven fabric, a knit, or a non-woven fabric.

The heat shielding layer is preferably a woven fabric, non-woven fabric, or knit containing aramid fibers and polyester fibers in a ratio of 60/40 to 95/5, and more preferably 80/20 to 95/5. When the mixing ratio of the polyester fiber is 5% or less, in the radiant heat resistance test specified in ISO 6942, the time RHTI ₂₄ until the sensor temperature rises by 24 ° C. may not be 18 seconds or more, while the mixing ratio of the polyester fiber In the case of 40% or more, there is a possibility that afterflame is seen or melted in the test of JIS L 1091 A-4 method or JIS L 1091 A-1 method.

Further, in the present invention, it is important that the polyester fiber is covered with the aramid fiber even if the mixing ratio of the polyester is 5% to 40%, and the polyester coverage is 50% to 90%. Is required, preferably 70% to 90%, more preferably 75 to 90%. When the coverage is less than 50%, afterflame may be seen or melted during the test of JIS L 1091 A-4 method or JIS L 1091 A-1 method, while the coverage is 90%. In the case where it exceeds 50% or more, since the coverage is high, the thickness does not come out, and in the radiant heat resistance test specified in ISO 6942, the time RHTI ₂₄ until the sensor temperature rises by 24 ° C. may not be 18 seconds or more.

Also, the basis weight of the protective clothing is preferably 420~520g / ^{m 2,} the basis weight is lighter than 420 g / ^{m 2,} it may be difficult to pass the after-flame test and resistance to radiation heat test described above. When the basis weight is 520 g / m ² or more, the weight of the protective clothing increases, and the movement of the wearer is inhibited.

Hereinafter, the present invention will be described in more detail with reference to examples. In addition, the measurement of the evaluation item used for the Example was performed with the following method.
(1) Basis weight Measurement was performed according to JIS L 1096.
(2) Thickness Based on JIS L 1018 (hairy knitted fabric), a load of 3 g / cm ² was applied to perform measurement.
(3) Polyester fiber coverage The spun yarn in which the polyester fiber is coated with the aramid fiber was observed with an SEM and calculated from the photograph by the following formula.
Polyester coverage (%) = ((area of entire spun yarn) − (exposed area of polyester fiber)) / (area of entire spun yarn) × 100
(4) Radiant heat resistance test RHTI ₂₄ was determined from the start of radiant heat exposure until the copper sensor rose by 24 ° C at a heat flux of 40 kW / based on ISO6942 (2002).
(5) Flammability Based on JIS L 1091, the afterflame time when the sample was subjected to an indirect flame for 3 seconds was measured.

[Example 1]
A double-structured fabric is used as the outer layer, and on the outside, polymetaphenylene isophthalamide fiber (manufactured by Teijin Techno Products, trade name: Conex) and coparaphenylene-3, 4 'oxydiphenylene terephthalamide fiber ( A plain weave made of spun yarn (count: 40/2) made of heat-resistant fibers mixed with Teijin Techno Products Ltd. (trade name: Technora) at a mixing ratio of 90:10 is arranged. Was woven by placing a plain weave using 100% spun yarn (count: 40 /-) of coparaphenylene-3, 4 'oxydiphenylene terephthalamide fiber (manufactured by Teijin Techno Products Co., Ltd., trade name: Technora). The outer and inner woven fabrics were joined in a lattice pattern by the inner technola, and the lattice spacing was 20 mm. The basis weight of the surface layer was 200 g / m ² .

In the intermediate layer, polymetaphenylene isophthalamide fiber (manufactured by Teijin Techno Products, trade name: Cornex) and coparaphenylene 3, 4 'oxydiphenylene terephthalamide fiber (manufactured by Teijin Techno Products Co., Ltd., trade name: Technora) ) And polytetrafluoroethylene on a woven fabric (weight per unit: 80 g / m ² ) woven into a plain weave using spun yarn (count: 40 / −) made of heat-resistant fibers mixed at a mixing ratio of 95: 5 A laminate of a moisture permeable waterproof film made by Japan Gore-Tex was used.

For the heat shielding layer, polymetaphenylene isophthalamide fiber (manufactured by Teijin Techno Products Co., Ltd., trade name: Cornex) and coparaphenylene 3,4 'oxydiphenylene terephthalamide fiber (manufactured by Teijin Techno Products Co., Ltd., trade name: Technora), spun yarn (count: 40 /-) 1 composed of heat-resistant fibers mixed at a mixing ratio of 95: 5, and 33 dtex / 12 filament polyethylene terephthalate fiber (THY N301S SDC; manufactured by Teijin Fibers Ltd.) One yarn and the above 1 were combined, and the yarn 2 twisted 500 times in the S direction was woven according to the organization diagram shown in FIG. 1 with a weaving density of 113 yarns / inch and weft 80 yarns / inch. The fabric was used after desizing at 80 ° C. for 1 minute and the final set at 180 ° C. for 1 minute.
Three layers of the above surface layer, intermediate layer, and heat shield layer were stacked and sewn to obtain a heat-resistant protective clothing. The evaluation results of the obtained heat-resistant protective clothing are shown in Table 1.

[Example 2]
In Example 1, except that one 33 dtex / 12 filament polyethylene terephthalate fiber (THY N301S SDC; manufactured by Teijin Fibers Ltd.) and the above 1 were combined, and the yarn 2 that was twisted 860 times in the S direction was used. The same operation as in Example 1 was performed. The results are shown in Table 1.

[Comparative Example 1]
In Example 1, except that one 33 dtex / 12 filament polyethylene terephthalate fiber (THY N301S SDC; manufactured by Teijin Fibers Ltd.) and the above 1 are combined, and the yarn 2 that is twisted 450 times in the S direction is used. The same operation as in Example 1 was performed. The results are shown in Table 1.

[Comparative Example 2]
In Example 1, two yarns of 56 dtex / 12 filament polyethylene terephthalate fibers (THY N800S SDC; manufactured by Teijin Fibers Ltd.) were combined and used as the heat-shielding layer, and only the yarn that was twisted 500 times in the S direction was used. It implemented like Example 1 except having used the textile fabric. The results are shown in Table 1.

  According to the present invention, a heat-resistant protective clothing having a three-layer structure composed of a surface layer, an intermediate layer, and a heat shielding layer, which has sufficient performance as a protective clothing for a fire brigade can be obtained.

1 Spinned yarn made of heat-resistant fiber 2 Synthetic yarn of spun yarn and polyethylene terephthalate fiber

Claims (5)

A heat-resistant protective clothing comprising a surface layer, an intermediate layer, and a thermal barrier layer, wherein the thermal barrier layer simultaneously satisfies the following requirements (1) to (3), and the protective clothing is a JIS LA-4 method The heat-resistant protective clothing is characterized in that the after-flame specified in 2 is within 2 seconds, and in the radiant heat resistance test specified in ISO 6942, the time RHTI ₂₄ until the sensor temperature rises by 24 ° C. is 18 seconds or more.
(1) The heat shielding layer contains aramid fibers and polyester fibers, and the mixing ratio is 60/40 to 95/5.
(2) The coverage of the polyester fiber by the aramid fiber is 50% to 90%.
(3) The thickness prescribed in JIS L 1018 (for hair knitted fabric) is 2 mm or more. Claim 1, wherein heat-resistant protective clothing fabric weight of protective clothing is 420~520g / ^{m 2.}   The heat-resistant protective clothing according to claim 1, wherein the aramid fiber is an aramid fiber comprising a meta-aramid fiber and a para-aramid fiber in a ratio of 80/20 to 95/5. The heat-resistant protective clothing according to claim 1 , wherein the surface layer includes para-aramid fibers, and the mixing ratio of the para-aramid fibers is 1 to 70% by weight with respect to the total weight of the fibers constituting the surface layer.   The heat-resistant protective clothing according to claim 1, wherein the intermediate layer has a moisture-permeable waterproof layer.

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