Metallised material ''nanotex''

FIELD: textile industry, paper industry.

SUBSTANCE: invention relates to the technology of metallised material production for shielding from electromagnetic radiation in a broad range. Metallised material ''Nanotex'' is made of synthetic monofilament thread with diameter of 30-50 micron, and a number of threads is 30-160 threads per cm and surface density is 10-50 g/m2. Material has orifices between beam threads and shoots, size of which ranges within 1d-9d, where d is thread's diameter. Metal pads with predetermined surface resistance can be distributed over the material by weave or woven methods. The invention ensures production of the material with stable performances having high shielding capacity from different types of radiation including high-frequency radiation ranged from 300 to 16000 MHz.

EFFECT: production of the material with stable performance having high shielding capacity from different types of radiation.

3 cl, 2 dwg, 1 tbl, 5 ex

 

Metallized material "Nanotex" refers to the textile industry and can be used for shielding from electromagnetic radiation in a wide range.

Almost shielding fabric can be used for the manufacture of:

local shielding chambers (rooms, offices, objects);

- protective clothing;

- lung covers and capes for equipment and appliances;

- protective device for preventing information leaks from the premises, military installations, etc.;

- decorative items.

Currently, when equipped with shielded rooms for certification of radio equipment for domestic and industrial use, conducting radio engineering measurements for compliance with the standards and requirements of the electromagnetic compatibility and biological protection of personnel against radiation microwave sources necessary materials, able to function effectively in a wide wavelength range.

Known fabric for the top of the heat-shielding and heat-reflecting costume for employees of the fire service in the oil and gas industry, subject to the production of the effects of extreme factors, such as fire, intense radiation, etc. the Fabric is on the front side of the continuous metallic coating auth. St. No. 2104347).

However, this fabric does not provide protection from electromagnetic radiation. In addition, the metallized coating due to the rigidity during operation cracks, the result is peeling (ed. St. No. 2104347, D3D 15/12) and falling.

Known fabric for special service made on the basis of a simple weave of forming a conductive grid with square cells conductive core and weft threads, respectively alternating with synthetic background the main background thread and weft threads, which is a yarn containing cotton fibers, with the location of the flooring at the front side of the fabric, and the weft ceilings on the wrong side, with the conductive strands to form a conductive grid and are located with a spacing in the range of 0.5×0.5 mm to 2×2 mm, and the ratio of conductive and background threads is range (25-50: 75-50) wt.% (U.S. Pat. Russia №2110628, 10.05.98. Bulletin no.13).

This fabric has good barrier properties and good appearance. However, this fabric does not provide protection in the range of electromagnetic waves 40-60 dB, due to the inclusion of the conductive yarn has a high enough surface density and cannot be used when the weight of the material is determined is shining for its functionality.

The closest analogue is the material for protection from exposure to radiation, which represents the non-metallic base, including fabric coated with an electrically conductive coating, which consists of layers, and the first from the base layer is made in the form of a composition consisting of a non-metallic electrically conductive compounds and metals, and the remaining layers are made of electrically conductive non-metallic compounds and/or metals. The coating is carried out by galvanic method. This material with a thickness of from 2-15 microns provides the weakening of the magnetic fields in the frequency range from 50 Hz to 30 MHz.

However, this material is not very effective for protection from exposure to high frequency radiation from 300-16000 MHz.

In addition, the laminate is not possible with sufficient accuracy to control its conductivity and other properties, as well as to obtain a material with a given conductivity, which is of great importance for future applications. The disadvantage is the increased stiffness of the material.

The metallization process is sequential, from electrolyte solutions containing aggressive and toxic materials requiring disposal.

Technical result achieved in the proposed textile material, is what obespechenie high shielding against electric, electromagnetic, magnetic fields, infrared radiation indicators along with stable performance through the creation of a certain material structure that allows you to apply thin layers of nanosized metal particles having a high bonding strength with the substrate.

This technical result is achieved due to the fact that the material for metallization is made of synthetic monofilament yarns with a diameter of 30-50 μm with a density of threads 30-160 nits/cm, the surface density of 10-50 g/m2with openings between the warp and weft threads, the size of which ranges from 1d-9d, where d is the diameter of the thread.

After running out to obtain conductivity material "Nanotex" exposed metallization.

Metallization material "Nanotex" by means of a magnetron sputtering of the metal in vacuum from the front, back or both sides.

The method of magnetron sputtering allows to obtain nantoka films of various metals given thickness and a given surface resistance with a high level of adhesion to the substrate.

Graphical representation of the dependencies of conductivity and surface resistance from the time of deposition of metal on the material "Nanotex" shown in figure 1 and 2.

Uniform surface structure of the fabric or t is of ecotage "Nanotex", having holes with a stable size, provides even for very thin coatings of metal of high conductivity at each point of the material and good shielding properties in a wide wavelength range, the weight of the coated material is only 10-50 g/m2.

The invention is illustrated by the following examples.

Example 1.

Material "Nanotex from polyamide monofilament yarns with a diameter of 30 μm, a density of filaments 30 nits/cm, the distance between the threads 9d and with a surface density of 10 g/m2, metallizer way magnetron sputtering stainless steel on the front side of the material at a constant current time spraying was 80 sec, the deposition rate of 240 A/ min, the thickness of the metal film of 0.5 μm.

Example 2.

Material "Nanotex from polyester monofilament yarns with a diameter of 40 μm, a density of filaments 100 nits/cm, the distance between the threads 1,5d and weighing 40 g/m2metallizer aluminum as in example 1 on both sides.

Example 3.

Material "Nanotex from polyamide monofilament threads with a diameter of 50 μm, the density of the filaments 160 nits/cm, the distance between the threads 1d and weighing 50 g/m2metallizer copper as in example 1, with the reverse side.

Example 4.

The knitted fabric "Nanotex from polyester monofilament yarn diameter is trom 40 μm, the thread 100 nits/cm, the distance between the threads 5d and weighing 40 g/m2metallizer stainless steel as in example 1.

Example 5 (analog).

Fabric base consistently treated first in ammoniacal solution of salts (sulphide of silver, tin, chromium, graphite and bismuth) in the ratio of 70:30 to full wet, and then, sequentially, in water, in a solution of sodium sulfide in water, in tartrato the bismuth salt solution and again water. The second metal layer is applied by electroplating from an electrolyte containing Nickel sulfate 200 g/l, cobalt chloride 40 g/l boric acid 30 g/l saccharin 0.5 g/l at a temperature of 40°and a current density of 1 A/DM2thickness of 3 μm. The third layer is also applied by electroplating from a solution of copper sulfide. The thickness of copper layer of 1 μm. The total coating thickness is 4 μm.

These tables show that the proposed structure of the material "Nanotex provides a shielding cloth having the best performance characteristics, including higher wear resistance, minimum surface density, less rigidity while maintaining shielding properties in a wide range of radiation.

Number exampleSurface area is the ability to metallization, g/m2The surface density after metallization, g/m2Radiophysical characteristics of tissues in the microwave range 10-16 GHzHardness, pointsAbrasion, cycles
The reflection coefficient, dB
Example 110117659000
Example 2404184610500
Example 3505190711000
Example 4404182810700
Example 5 (analog)557963237600

The changing characteristics of the claimed material "Nanotex" in a big way is not possible to form it on the loom. Scaling down results in unstable, legkodelimae structure of the material and, consequently, to the loss conductive and shielding properties.

The resulting material is different:

- high shielding characteristics from exposure to radiation of the microwave range;

- vozmozhnostuvelichivat a given conductivity and surface electrical resistance;

- high electrical conductivity, allowing the use of the material to solve the problems of static electricity;

- flexible, lightweight, drape, breathability is necessary properties for use in various protective structures, curtains, overalls;

good sewing properties, the ability soldering and gluing.

1. Material on a fabric basis of synthetic monofilament yarns with a diameter of 30-50 μm with a density of threads 30-160 nits/cm and weighing 10-50 g/m2and with openings between the warp and weft threads, the size of which is within 9d-1d, where d is the diameter of the strands that are electrically conductive metallic coating, in the form of a thin layer of nanoparticles of metal caused by the method of magnetron sputtering in vacuum.

2. The material according to claim 1, characterized in that it contains a metallic surface with front, back or both sides with a given surface resistance.

3. The material according to claim 1, wherein the fabric base is made weaving or knitting method.



 

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