RU2164930C1 - Layered fire-retardant material - Google Patents

Abstract

FIELD: fire-protective garments. SUBSTANCE: material is constructed in the form of packet and contains outside layer made from fire-protective fibers, intermediate heat- insulation layer, inside cotton cloth layer, and waterproofing layer made from siloxane composition disposed between intermediate layer and outside layer, which, together with the latter, constitutes 0.02 to 0.05 thickness of intermediate layer. The siloxane composition contains synthetic low-molecular silicon-containing liquid rubber with special-type filler, 3.5 to 30 wt.pts per 100 wt.pts rubber, in the form of polymer mixture and methyltriacetoxyl-based hardener in amount 3.5 to 5.0 per 100 wt.pts of polymer mixture. EFFECT: improved bend and wear resistance and decreased consumption of polymer for waterproofing layer. 1 tbl, 3 ex

Description

 The invention relates to the technology of textile finishing production, namely, to the finishing of heat-resistant materials for tailoring special fire-resistant clothing, giving them high physical and mechanical properties.

 Known fire retardant fibrous material with a finish by treating it with an aqueous solution of the polycondensation product of tetrakis- (oxymethyl) -phosphonium with urea (US patent N 2809941, 1997).

 The fibrous material obtained in this way has low fire resistance and textile properties caused by an increase in its stiffness.

 Known material in the form of a two-layer fabric for personal protective equipment of the human skin from fire, containing an outer layer of fire-resistant threads (oxalone) made by plain weave, and an inner layer made of waffle weave with rapport with alternating at the base of fire-resistant and natural (from linen) threads. The layers are interconnected by the 3rd and 7th weft threads of the outer layer and the fire-resistant main threads of the inner layer (RF patent N 2017871, 1994).

 The material has a fairly high fire retardant and strength properties. Due to the structure of the fabric, which provides an air gap between the layers, the insulating ability of the inner layer is slightly increased, which is still insufficient to protect the skin when fabricating basic work clothes worn on linen from a material under significant exposure to fire or thermal radiation. Clothing made of such material does not protect workers, in particular firefighters, from exposure to water.

 Known closest to the claimed technical solution, selected as the closest analogue is a multilayer fire-retardant material for the manufacture of protective clothing against heat exposure, comprising an outer layer of armide material, an intermediate heat-insulating layer, an inner layer of cotton fabric and a waterproofing layer of between the intermediate and outer layers fluoropolymer or siloxane composition, which together with the outer layer is from 0.02 to 0.05 of the thickness of the intermediate refine the heat-insulating layer.

 However, the known multilayer fire-retardant material has low performance, which is clearly manifested in the rather rapid destruction of special fire-retardant clothing made of such material. Destruction occurs when exposed to clothing during operation, such as fire, alternating loads and abrasion. Such a material has a rather high polymer consumption for the formation of a waterproofing layer.

 An object of the invention is the creation of a new multilayer fire-retardant material with high bending and wear resistance at the lowest polymer consumption for a waterproofing layer while maintaining high waterproof qualities of the material.

 The problem is solved in that in a multilayer fire-retardant material made in the form of a package and containing an outer layer of heat-resistant fibers, an intermediate heat-insulating layer, an inner layer of cotton fabric and a waterproofing layer of a siloxane composition located between the intermediate and outer layers, which together with the outer layer ranges from 0.02 to 0.05 of the thickness of the intermediate layer, according to the invention, the siloxane composition of the waterproofing layer includes synthetic rubber t rmostoyky low molecular weight compound SKTN (GOST 13835-73. Synthetic rubber, heat-resistant, low molecular weight), the filler of which is Aerosil (GOST 14922-77. AEROSIL. Specifications. Gosstandart, Moscow) of one of the brands A-300, A-380 v the amount of 3.5-30 wt.h. per 100 parts by weight SKTN with the formation of a polymer mixture, and K-10C hardener (TU 6-02-874-79. K-10C hardener) of the methyltriacetoxyl type in the amount of 3.5-5.0 parts by weight was used as its hardener. per 100 wt. including polymer mixture.

 With this composition of the siloxane composition of the waterproofing layer, the presence of Aerosil as the SCTS filler increases the flexural and wear resistance of the multilayer fire-retardant material, and the composition with such a filler provides the lowest consumption of the waterproofing layer while maintaining high waterproof properties of the material, which can be seen from the examples below.

 Example 1

 In a mixer containing 100 kg of synthetic low molecular weight silicon-containing liquid rubber SKTN, 3.5 kg of Aerosil A-300 or A-380 are gradually added and stirred for 1 hour. Then the mixture is drained and left for 24 hours.

 6 kg of the mixture are taken into a container of at least 10 l and 0.21 kg of hardener are added to it, methyltriacetoxyl is taken as this. After thoroughly mixing the mixture with the hardener for 2-3 minutes, a composition with a viability of 1 hour is obtained.

 Example 2

 In a mixer containing 100 kg of synthetic low molecular weight silicon-containing liquid rubber SKTN, 16.8 kg of Aerosil A-300 or A-380 are gradually added and stirred for 1 hour. Then the mixture is drained and left for 24 hours.

 6 kg of the mixture are taken into a container of at least 10 l and 0.4 kg of hardener are added to it, methyltriacetoxyl is taken as this. After thoroughly mixing the mixture with the hardener for 2-3 minutes, a composition with a viability of 1 hour is obtained.

 Example 3

 30 kg of Aerosil A-300 or A-380 are gradually added to a mixer containing 100 kg of synthetic low molecular weight silicon-containing liquid rubber SKTN and stirred for 1 hour. Then the mixture is drained and left for 24 hours.

 6 kg of the mixture are taken into a container of at least 10 l and 0.6 kg of hardener are added to it, for which a K-10C hardener of the methyltriacetoxyl type is taken. After thoroughly mixing the mixture with the hardener for 2-3 minutes, a composition with a viability of 1 hour is obtained.

A layer of the composition obtained in each of the 3 examples is applied to the inner surface of the layer of heat-resistant fibers, which will serve as the outer layer of the package of multilayer fire-retardant material, and then the applied layer is vulcanized in the chamber at a temperature of 150 ^o ± 20 ^o C and acts as a waterproofing a layer located between the intermediate layer, which borders the inner layer of the package, and the outer layer, and the waterproofing layer together with the outer layer is from 0.02 to 0.05 of the thickness of the intermediate layer.

 With such a waterproofing layer, the properties of the multilayer fire-retardant material are improved (see table).

 A comparative analysis of the claimed invention and the prototype reveals the presence of distinctive features of the claimed material in comparison with the closest analogue, which allows us to conclude that the proposed solution meets the criterion of "novelty."

 The presence of distinctive features makes it possible to obtain a positive effect, expressed in the creation of a new multilayer fire-retardant material with high bending and wear resistance with the least application of a waterproofing layer on the fabric.

 Since when examining the object of the invention in patent and scientific literature, no solutions were found containing the features of the claimed invention other than the prototype, it should be concluded that the claimed invention meets the criterion of "significant differences".

 The use of the claimed invention in the technology of textile finishing production ensures the invention meets the criterion of "industrial applicability".

Claims (1)

 A multilayer fire-retardant material made in the form of a package and containing an outer layer of heat-resistant fibers, an intermediate heat-insulating layer, an inner layer of cotton fabric and a waterproofing layer of a siloxane composition located between the intermediate and outer layers, which together with the outer layer is 0.02-0. 05 thickness of the intermediate layer, characterized in that the siloxane composition of the waterproofing layer includes a synthetic low molecular weight silicon-containing liquid rubber SKTN with weighting agent - Aerosil brand A-300 or A-380 in an amount of 3.5 to 30 wt.h. per 100 parts by weight SKTN in the form of a polymer mixture and hardener K-10C based on methyltriacetoxyl in the amount of 3.5 - 5.0 wt.h. per 100 wt. including polymer mixture.

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