Sandwich material for rescue facilities

FIELD: process engineering.

SUBSTANCE: invention relates to sandwich materials intended for making aircraft rescue hardware, particularly, to making sliding ways of rescue duckboards, mainly, to sandwich material for rescue means. It comprises textile substrate of synthetic threads with polyurethane coat with fire retardant applied thereon on face and back sides. Said textile substrate represents a polyester fabric. Said polyurethane coat comprises extra fluorine rubber. Face side includes additionally an electrically conducting layer. Said electrically conducting layer contains polyurethane, fluorine rubber and carbon filler. Carbon nanotubes are used as a carbon filler.

EFFECT: higher wear resistance and tensile strength.

5 cl, 1 tbl, 3 ex

 

The present invention relates to multilayer materials intended for the production of life-saving equipment in aviation, in particular, for the manufacture of track slip rescue ladders.

Known conductive fabric for products that reduce exposure to electromagnetic radiation containing interwoven basic and filling conductive and electrically insulating fibers (patent RF №2354766).

Also known tissue-based conductive fibers containing carbon particles used to track sliding emergency ladder and providing a swelling of the static electric charge (patent GB 1442711).

The disadvantage of this material is its low wear resistance, short life due to the low resistance of these materials to abrasion and bending.

Known conductive fabric for protection from electromagnetic radiation, which is a grid of metal (electrically conductive) threads (RF patent 2054064).

The disadvantage of this tissue are low corrosion resistance and resistance to abrasion and bending.

The closest in purpose and technical nature and adopted for the prototype, is a multilayer material for tracks slip rescue equipment, including a fabric base m is soy 160 g/m 2made from nylon yarns with a linear density of 210 denier and deposited on both sides of the layers of the coating based on thermosetting polyurethane elastomer containing as moderator of combustion of the flame retardant in the form of needle-shaped crystals with a length of grain ≤100 µm and bromine in an amount not less than 50%, and on the outer side of the material are coated, additionally containing aluminum powder (U.S. patent No. 5542629).

The disadvantages of this material are low tensile strength, low bond strength between the coating layers, insufficient conductivity, the complexity of the technological process of obtaining a homogeneous thermoplastic composition (polyurethane elastomer with added fire retardant product), forming layers of the coating and its application to a fabric base due to the use of needle flame retardant, which can greatly reduce the resistance of the material.

The technical object of the present invention is to provide a multilayer electrically conductive non-flammable, wear-resistant material having high tensile strength.

For the technical solution proposed multilayer material for rescue equipment, including a textile basis of synthetic fibres and deposited with the front and isanon the second side of the polyurethane coating with flame retardant, characterized in that the textile basis using polyester fabric, polyurethane coating further includes a fluoropolymer elastomer, the front side further comprises a conductive layer.

Conductive layer includes polyurethane, silicone elastomer and the carbon filler.

As a carbon filler used carbon nanotubes.

The weight ratio of textile base, front and back cover are respectively 1:(0,4-0,5):(0,3-0,4).

As a flame retardant use tetrabromodiphenylether, decabromodiphenyl oxide, antimony trioxide.

Used in the present invention the polyester fabric has compared to the cloth of nylon prototype advantage in heat resistance and relative strength: melting point polyester fibers is 260-265°C, temperature tensile strength of polyester - 248°C, loss of strength begins after 180°C; melting point polyamide fibers (including nylon) - 218-250°C, heating the polyamide fibers at temperatures above 100°C leads to the loss of their strength. In addition polyester yarns in comparison with polyamide has a higher resistance to the effects of light, water, chemicals and organic solvents, which is of great importance in the manufacture of the operation of the material.

Introduction in the coating composition of the silicone elastomer has improved such material properties as resistance, heat resistance, resistance to abrasion, weathering, to increase the service life of the coating.

The application of an additional conductive layer (coating) on the front side allows you to give to the material conductivity, necessary to ensure Oceania static electric charge from the track slip rescue ladder.

It is established that the application of the electroconductive layer (coating) of carbon nanotubes during combustion contributes not only to the formation of coke residue, but also increases the viscosity of the melt, provides its carbonation that makes it possible to solve the problem of reducing the smoke-forming ability, and exclude calipatria during combustion of the material.

In the absence of needle flame retardant mixture components in the preparation of polymeric compositions are produced by mixing roll mill or a mixer that enables you to evenly distribute the components in the mixture and provides a homogeneous composition.

Examples of implementation

Example 1.

On a textile base fabric polyester art. 5356 (TU 8378-134-35227510-2007) twill weave weighing 179 g/m2the direct method using acelnoolora put the wrong layer of polyurethane coatings based on rubber SKU-8A (TU 38 103209), fluoro SCF-32 (GOST 18376), flame retardant of tetrabromodiphenylether (TU 2494-409-04872688-99). Weight the wrong layer (weight of coating) amounted to 50 g/m

Next on textile basis of the direct method using a doctor knife struck the front layer of polyurethane coatings based on rubber SKU-8A, fluoro SCF-32, flame retardant of tetrabromodiphenylether. The weight of the front layer (the gain from cover) amounted to 33 g/m2.

Then on the front side of the material by a direct method using a doctor knife stabbed with a conductive layer containing rubber SKU-8A, fluoro SCF-32, and carbon nanotubes TAUNIT-M (TU 2166-002-02069289). Gain from the coverage amounted to 50 g/m2. The ratio of the textile base, front and back cover was: 1:0,5:0,3.

Example 2.

On a textile base fabric polyester art (TU 8378-118-35227510-2005) plain weave weighing 160 g/m2a direct method using a doctor knife stabbed the wrong layer of polyurethane coatings based on rubber SKU-8 TB (TU 38 103468), fluoro SCF-26 (GOST 18376), flame retardant antimony trioxide (TU 48-14-1). Weight the wrong layer (weight of coating) amounted to 70 g/m2.

Next on textile basis of the direct method using a doctor knife struck the front layer of polyurethane coatings based on rubber SKU-8 TB, fork is ucucha SCF-26, flame retardant antimony trioxide. The weight of the front layer (the gain from cover) amounted to 45 g/m2.

Then on the front side of the material by a direct method using a doctor knife stabbed with a conductive layer containing rubber SKU-8 TB, fluoro SCF-26 and carbon nanotubes TAUNIT-M (TU 2166-002-02069289). Gain from the coverage amounted to 35 g/m2. The ratio of the textile base, front and back cover was: 1:0,5:0,4.

Example 3.

On a textile base fabric polyester art (TU 8378-117-35227510-2006) twill weave weighing 176 g/m2a direct method using a doctor knife stabbed the wrong layer of polyurethane coatings based on rubber SKU-8A, fluoro GFR-264 (TU 2294-01-81-39-93-708-2004), flame retardants of decabromodiphenylethane (TU 6-47-49) and antimony trioxide (TU 48-14-1). Weight the wrong layer (weight of coating) amounted to 60 g/m2.

Next on textile basis using a doctor knife struck the front layer of polyurethane coatings based on rubber SKU-8A, fluoro-rubber GFR-264 flame retardants of decabromodiphenylethane and trioxide of antimony. The weight of the front layer (the gain from cover) amounted to 38 g/m2.

Then on the front side of the material by a direct method using a doctor knife stabbed with a conductive layer containing rubber SKU-8A, fluoro GFR-264 and carbon is haunted nanotubes TOUNIT) Gain from the coverage was 40 g/m2. The ratio of the textile base, front and back cover was: 1:0,4:0,3. Material properties are given in the table.

Test breaking load was carried out according to GOST 17316, abrasion - M 38.405-51/3-11-137-91, the value of electrical resistance - STF 1-595-19-362-2002, resistance to repeated bending - M 38405-712-90, Flammability - AP-25, app. F, part 1, smoke developed - according to GOST 24632.

Table
Name propertiesExamples according to the inventionThe placeholder
123
The breaking load, kg
on the basis of22019524712
on a duck19021020012
Resistance to IP is Irani, cycles249013711505720
The value of electrical resistivity (conductivity), Ohm(4,7-4,8)*106(1,3-1,8)·106(4,7-7,7)·106More than 4.0·107
Resistance to repeated bending, the number of cycles to failure354150230000263250150400
Flammability: Time residual burning, smoldering, s1012
Material classificationII Slightly smokyII Slightly smokyII Slightly smokyIII Medium fuming

As can be seen from the table, the proposed material has a high breaking load (tensile strength) and exceeds the prototype 16-20 times on the basis of Yves 15-17 on a duck, the abrasion resistance of the material and resistance to repeated bending higher than about what atipa respectively 1.9-3.5 and 1.5 - 2.3 times. The material presented, unlike the prototype, has a high conductivity and can be classified as conductive materials, as this group includes materials having a value of electrical resistance of less than 107Om. The material has time residual burning, smouldering 0-1 sec. (prototype - 2 sec.), the smoke refers to the P group and the prototype - to W. Thus, the use of the proposed material for the tracks of the sliding passenger rescue ladder will increase the reliability of life-saving equipment to prevent static electricity and prolong the time of evacuation in extreme conditions.

1. Multilayer material for rescue equipment, including a textile basis of synthetic fibers deposited on front and back sides of the polyurethane coating with flame retardant, characterized in that the textile basis using polyester fabric, polyurethane coating includes a fluoropolymer elastomer, the front side further comprises a conductive layer.

2. Multilayer material for life-saving equipment according to claim 1, wherein the conductive layer includes polyurethane, silicone elastomer and the carbon filler.

3. Multilayer material for life-saving equipment according to claim 1, characterized in that, as in Narodnogo filler using carbon nanotubes.

4. Multilayer material for life-saving equipment according to claim 1, characterized in that the weight ratio of textile base, front and back cover are respectively 1:(0,4-0,5):(0,3-0,4).

5. Multilayer material for life-saving equipment according to claim 1, characterized in that as a flame retardant is used tetrabromodiphenylether, decabromodiphenyl oxide, antimony trioxide.



 

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