RU2677160C1 - Fire resistant textile thread with low electrical resistance - Google Patents

Abstract

FIELD: textile and paper.

SUBSTANCE: invention relates to the textile industry, and relates to the yarn for the high-strength fire-resistant products production with conductive, shielding functions, which are in demand for functional clothing for the electric power industry, for the high-voltage wires electrical installation works, in the aerospace industry, army, navy, EMERCOM. Low electrical resistance textile yarn contains a core from the stainless steel, or carbon, or Kevlar fibers or filaments, as well as external winding in the form of copper foil tape, with the low electrical resistance metal surface coating.

EFFECT: proposed is the low electrical resistance textile thread.

7 cl, 1 dwg, 1 tbl

Description

The invention relates to the textile industry and relates to filaments for producing high-strength fire-resistant products with conductive, shielding functions that are in demand in functional clothing for the electric power industry, for electrical work of high-voltage wires, in the aerospace industry, army, navy, and the Ministry of Emergencies.

Known combination thread (RU2620046, IPC D02G3 / 00, published May 24, 2017) made of a complex core para-aramid twisted yarn wrapped in two polyoxadiazole twisted yarns in opposite directions, first counterclockwise and then clockwise, when the core thread is tensioned 55-180 cN, with the ratio of twists of the core thread and the wrapping yarn (0.5-0.6) :( 2.9-3.9), with their mass ratio, wt.%: (17-34) :( 66 -83), and the number of wraps is 220-390 obkr / m, and the wrapped surface of the core thread is at least 65%.

Known thread is not suitable for high-strength fire-resistant products with conductive properties of electricity.

Known reinforced thread (patent RU2101399, IPC D02G3 / 36), which contains a core made of at least one metal corrosion-resistant wire with a diameter of 0.06-0.09 mm, twisted with at least one aromatic polyamide thread of linear density 29.4-167 tex. The core is twisted in two opposite directions with synthetic threads, in one direction with threads based on polyamide benzimidazole terephthalamide or based on copolyparaphenylene terephthalamide or polyester, and in the other direction with polyester or polyamide thread. As an aromatic polyamide core thread, a thread based on copolyparaphenylene terephthalamide mixed with an aliphatic polyamide is also used in an amount of 5-20 wt.% Of the weight of the aromatic copolyamide. The degree of spin is 3-8 turns / cm.

Known reinforced thread (RU2122610, IPC D02G 3/12, D02G 3/36, publ. 11/27/1998), which contains a flexible core having at least one high-strength corrosion-resistant metal wire and at least one high-modulus chemical thread and sheath . The shell is made in the form of a compacted fibrous sliver, wrapping the core under tension. The ratio of the total linear density of the core chemical thread to the linear density of the sliver is 1: (0.8-3.5). High-modulus threads are made of linear density equal to 22-167 tex, and the wire is made of a nickel-chromium alloy with a diameter of 0.02-0.15 mm.

A disadvantage of known yarns is their low fire resistance. In addition, the presence in the core of a metal wire reduces the textile quality of the thread. In addition, the last analogue has a completely insulated surface, which does not have fire-resistant properties. It also has no antistatic, shielding, antibacterial properties. It can not serve as protection against exposure to electromagnetic fields, high-frequency (HF) and low-frequency waves (LF) before and after exposure to fire.

The objective of the invention is to create a textile thread to obtain functional clothing in order to protect human life and health from the harmful effects of electromagnetic fields, high-frequency (HF) and low-frequency waves (LF) before and after exposure to fire in the electric field, for electrical work of high-voltage wires, in aerospace sphere, army, navy, Ministry of Emergencies.

EFFECT: high conductivity, fire resistance, corrosion resistance of textile thread.

The problem is solved, and the technical result is achieved by a textile thread with low electrical resistance, containing a core of fibers or filaments of stainless steel or carbon, or Kevlar, as well as an external winding in the form of a tape of copper foil with a surface coating of a metal having a low electrical resistance.

According to the invention:

- the surface coating is made of tin or silver, or gold;

- the surface coating has a resistance (Ω / m) - 0.05-0.09 Ohm / cm;

- for the production of conductive flame retardant functional fabric / knitwear, the core is made of 316L-100F stainless steel filaments for fabric and 14.4 tex for knitwear;

- for the production of conductive flame retardant functional fabric / knitwear, the core is made of 3K carbon fiber filament;

- for the production of conductive flame retardant functional fabric / knitwear, the core is made of Kevlar yarn 31.3 tex for fabric, 14.4 tex for knitwear;

- the tape is made of tinned copper foil and has the following characteristics:

Width 0.032 mm. ± 0.002 mm

Thickness 0.025 mm. ± 0.003 mm

Winding Direction - Z

The number of revolutions of the tape per 10 mm. - 22 ± 2

Resistance (Ω / m) - 0.05-0.09 Ohm / cm.

The technical result is achieved by using metals in the thread, taking into account their physical properties, physico-mechanical characteristics of the fibers or filaments of the core and winding tape and in their structural solution. The surface coating of the core winding is made of metal having high electrical conductivity (tin, silver, or gold), which results in low thread resistance (Ω / m) - 0.05-0.09 Ohm / cm. Copper has an electrical resistance of 0.0175 Ohm · mm² / m; electrical resistance of surface coating metals:

silver - 0.016 Ohm · mm² / m;

gold - 0.023 Ohm · mm² / m;

tin - 0.12 Ohm · mm² / m.

The copper foil tape has the following characteristics:

Width 0.032 mm. ± 0.002 mm

Thickness 0.025 mm. ± 0.003 mm

Winding Direction - Z

The number of revolutions of the tape per 10 mm. - 22 ± 2

Resistance (Ω / m) - 0.05-0.09 Ohm / cm.

Stainless Steel Properties:

- electrical resistance 22 ± 5 (Ω / m);

- melting point 1375-1400 ° C (the thread does not burn, does not emit smoke or gas);

- maximum working temperature at 870 ° C;

- shielding efficiency;

- high heat conductivity.

Properties of carbon fiber yarn:

- low thermal conductivity;

- electrical conductivity (much lower than stainless steel);

- does not have shielding properties;

- small and stable coefficient of friction;

- the temperature coefficient of linear expansion of carbon fiber in the range of 20-120 ºС is close to zero;

- high strength and flexibility;

- does not burn, does not emit smoke or gas.

Kevlar fiber thread:

- Kevlar decomposes at a temperature of 430 - 480 ° C;

- thread self-extinguishing;

- When burning, Kevlar emits black smoke;

- high strength.

The invention is illustrated in the figure, which presents a General view of the thread. Textile yarn with low electrical resistance includes a core 1, the outer winding in the form of tape 2. The surface coating of copper tape (no position).

 To select a particular embodiment, the threads are guided by the purpose of the thread. The table shows preferred embodiments of the thread.

Table

The name of the thread element thread composition
(fibers or filaments) yarn specification for fabric knitting yarn specification kernel a) Stainless steel
b) Carbon
c) Kevlar 3K
31.3 Tex 22.2 Tex
3K
14.4 Tex winding surface-coated copper tape silver, gold, tin Width 0.032 mm. ± 0.002 mm
Thickness 0.025 mm. ± 0.003 mm.
direction -Z
10 mm. -22 ± 2 turns Width 0.032 mm. ± 0.002 mm
Thickness 0.025 mm. ± 0.003 mm. direction -Z
10 mm. -22 ± 2 turns Characteristics of the obtained thread resistance (Ω / m)
before exposure to fire and heat 0.05-0.09 ohm / cm 0.05-0.09 ohm / cm 0.05-0.09 ohm / cm resistance (Ω / m)
after exposure to fire and heat Ω / m≤ 0.05-0.09 Ohm / cm Ω / m≤ 0.05-0.09 Ohm / cm Ω / m≤ 0.05-0.09 Ohm / cm

Examples of the inventive textile yarn.

Example 1. For the production of conductive flame retardant functional fabric is proposed.

316L-100F stainless steel filament core, consisting of 100 filament threads. The core is entwined with a tinned copper foil tape with the direction of the winding - “Z”. The number of revolutions of the tape per 10 mm. - 22 ± 2

Tape width 0.032 mm. ± 0.002 mm, thickness 0.025 mm. ± 0.003 mm. The surface coating of a copper tape has a resistance (Ω / m) of 0.05-0.09 Ohm / cm.

Example 2. For the production of knitted products - conductive gloves it is proposed: core of Kevlar fibers -14.4 tex.

The core is entwined with a tinned copper foil tape with the direction of the winding - “Z”. The number of revolutions of the tape per 10 mm. - 22 ± 2. Tape width 0.032 mm. ± 0.002 mm, thickness 0.025 mm. ± 0.003 mm. After wrapping the rod with tinned copper, the thickness of the thread is 0.16 mm. The surface coating of a copper tape has a resistance (Ω / m) of 0.05-0.09 Ohm / cm.

Thus, the application of the invention allows to obtain a textile thread for functional clothing in order to protect human life and health from the harmful effects of electromagnetic fields, high-frequency (HF) and low-frequency waves (LF) before and after exposure to fire in the electric field, for electrical work of high-voltage wires, in the aerospace sphere, army, navy, Ministry of Emergencies, which has high conductivity, fire resistance, and corrosion resistance.

Claims (12)

1. Textile yarn with low electrical resistance, containing a core of fibers or filaments of stainless steel, or carbon, or Kevlar, as well as an outer winding in the form of a tape of copper foil with a surface coating of a metal having a low electrical resistance. 2. The textile thread according to claim 1, characterized in that the surface coating is made of tin, or silver, or gold 3. The textile thread according to claim 1, characterized in that the surface coating has a resistance (Ω / m) of 0.05-0.09 Ohm / cm. 4. The textile thread according to claim 1, characterized in that for the production of conductive flame retardant functional fabric / knitwear, the core is made of 316L-100F stainless steel filaments for fabric and 14.4 tex for knitwear. 5. The textile thread according to claim 1, characterized in that for the production of a conductive flame retardant functional fabric / knitwear, the core is made of 3K carbon fiber thread. 6. The textile yarn according to claim 1, characterized in that for the production of conductive flame retardant functional fabric / knitwear, the core is made of Kevlar yarn 31.3 tex for fabric, 14.4 tex for knitwear. 7. The textile thread according to claim 1, characterized in that the tape is made of tinned copper foil and has the following characteristics: Width 0.032 mm ± 0.002 mm Thickness 0.025 mm ± 0.003 mm Winding Direction - Z The number of revolutions of the tape per 10 mm - 22 ± 2 Resistance (Ω / m) - 0.05-0.09 Ohm / cm.

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