RO114812B1 - Woven fabric for aggressive medium resistant protecting materials and process for producing the same - Google Patents

Abstract

: The invention relates to a fabric for protective materials aggressive environments, designed for fire protection, anti-thermal, anti-acid, filter etc., and to a process for realizing it. The fabric according to the invention is formed both in warp and weft, from 100% synthetic fireproof, acrylic, thermostable, twisted, linked together by a link diagonally 2/2, with a beaded width 160 threads / 10 cm or 200 yarn / 10 cm, with 4 yarns in a box and with a straight nail a 4-wire warp threads or, in a variant of the embodiment, is formed in both the warp and the warp and weft, of flame retardant yarn, obtained from a mixture of 50% fireproof synthetic fibers, type acrylic, thermostable, and 50% wool, linked by a diagonal link 2 / 1,2 / 2 modified, atlas or cloth making the fabric consists of performing brush-steamer operations, washed on the machine in continuous flow with 4 basins, dried at 100 ° C, NOPAT, brushed-trimmed

Description

The invention relates to a fabric for protective materials, resistant to aggressive environments, intended for fire protection equipment, antitermic, antacid, filter etc. and a process for its realization.

Fabrics obtained from flame retardant synthetic fibers are known by introducing flame retardants into the polymeric composition or by surface treatment such as cellulose fibers with mass addition of phosphororganic, halogen or bromine compounds and acrylic fibers modified by the addition of additives.

These fabrics do not burn in contact with the flame, but they have the disadvantage that, when heated, they emit toxic vapors of halogenated or phosphorous acids and have an oxygen limit of about 30%.

Also known are fabrics with reduced flammability, made of modacrylic fibers.

These fabrics have a disadvantage of an oxygen index 28 ... 30% and a softening temperature, reduced - 130 ... 190 ° C.

Also known are fabrics made of glass fibers, carbon fibers which have disadvantages with an oxygen limit value below 41% and a high cost price.

Treatments are known for flame retardant fabrics, with formic acid and urea.

These processes have the disadvantage of having washable effects with diminishing flammability and in strong acid environment the fabric loses its strength until it is completely destroyed in time.

For permanent flame retardant treatments, organophosphorus products are used which have the disadvantage that both the fleet and the fabric contain formol, having a high toxicity.

Permanent flame retardant processes of cellulose or blended fabrics are known, in which the fabrics are lined with a 50% impregnation fleece containing flame retardant, dried, condensed and washed in a non-ionic detergent fleet.

These procedures have the following disadvantages:

- does not ensure a permanent flame retardation of the fabric, the diminution of this property being influenced by the repeated washes (after 20 washes the flame retardant effect is substantially diminished).

- the fireproofing treatment applied has a negative influence on the strength characteristics of the fabrics;

- The technology contains many phases with high consumption of chemicals, energy and labor.

The combustion samples after 10 consecutive fabric washes indicate the flame exposure time -10 s, the flame propagation time after the source withdrawal - O s, the incandescence retention time after the source withdrawal - Bone, the length of the charred area - 72 mm.

The technical problem that the invention solves is to establish the fabric structure and the conditions of manufacture so that the fabric obtained is flame-resistant and acid-resistant.

The invention has the following advantages:

- a permanent degree of fireproofing regardless of the number of washes;

- by contact with the flame the fabric does not burn, and after removing the heat source, no chemical compounds in the form of noxics are removed;

- the LOI index is over 45%;

- they do not contract and do not stretch at temperatures up to 250 ° C;

- chemical resistance to solvents;

- chemical resistance to acids,

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- reduce production costs;

- has low thermal and electrical conductivity and resistance to various corrosive environments;

- its natural permeability coupled with good textile properties ensures high comfort;

- absorbs moisture and perspiration;

- physical resistance to abrasion, material / material over 40 000 cycles;

- provides protection against fire, antithermal and antacid.

The following are three examples of embodiments of the invention.

According to the first embodiment, the fabric is formed both in warp and in fabric of 100% flame retardant synthetic yarn with Nm 24/2 fineness, with a 2/2 diagonal connection, with a warp thickness of 190 yarn / 10 cm and a tread in a fabric of 160 threads / 10 cm, with 4 warp yarns in the box and a back of 42, with a straight clearance of the warp yarns in 4 yokes.

The fabric is then subjected to brush-steaming operations, washed on the continuous washing machine with 4 basins, dried at 100P C, brushed, brushed, cut a passage to the right and ironed with a press.

The fabric thus obtained presents the following values of the main physical-mechanical characteristics:

- table

- the wariness of wariness

- the shattering beating

- traction resistant:

- warp

- beating

- elongation at break:

- warp

- beating

- Scratch resistant material / material 60 000 cycles

300 ... 350 g / m ² 190 + 20 fire / 10 cm 160 ± 20 fire / 10 cm min.50 daN min.40 daN min.17% min. 14%

- dimensional changes after min.5 max washings ± 3%

Fire behavior according to EN 532 / 533-1994 indicates the following:

- maintaining the flame after removing the source O s

- maintaining the incandescence after removing the O s source

- incandescence propagation after removal of the O s source

- hole formation does not appear

- the existence of the spark does not appear

- limited flame propagation index 3

According to STAS 8025/1984 and STAS 11357-90, the fabric according to the first embodiment is in the fuel class C-1.

- the duration of the flames does not appear

- glow retention time max. 10s

- smoke persistence max. 25 s

- the size of the carbonized surface max 50 cm ²

- the appearance of drops does not appear

According to the second embodiment, the fabric consists of warp yarns and synthetic flame retardant fabric, finely Nm 40/2, with diagonal connection

2/2, the seam in the warp of 230 yarns / 10 cm, the sowing in the fabric of 200 yarns / 10 cm, with 4 yarns in the box, the back 54, the right penetration of the warp yarns in 4 yokes.

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The fabric is then subjected to the same operations as in the first embodiment.

The main characteristics of the fabric obtained are the following:

200 ... 250 g / m ² 230 ± 20 fire / 10 cm 200 ± 20 fire / 10 cm min. 40 daN 30 daN 17%%

000 cycles ± 3% min min min

- table

- sowing;

-weft

- tensile strength: - warp

- beating

- elongation at break: - warp

- beating

- resistance to friction material / material

- dimensional changes after min. 5 washes

Regarding the fire behavior, determined by both methods, it fits the fabric to index 3 and the fuel class C-1.

According to the third embodiment, the fabric is formed both in warp and in fabric of flame retardant yarn with the Nm 24/2 fineness obtained from a mixture of 50% thermostabilized acrylic type flame retardant synthetic fibers and 50% wool fibers, with the connection 2/2 diagonal modified and seamed in 124 threads / 10 cm. back 68/2, straight edging in 8 axes; the diagonal connection 2/1 and the seam in the fold of 11 6 threads / 10 cm, back 48/3, straight penetration in 9 edges; cloth connection and seaming in 110 threads / 10 cm. back 62/2, straight edging with 8 axes, or atlas connection, with seaming in 124 threads / 10 cm, back 73/2, straight edging in 10 axes.

The fabric is then subjected to operations: brushed - steamed, washed in rope (Haspel type), folded, smoothed - fixed at 65 ° C and then cold, dried at 120 ° C, brushed right a passage, ironed in the press with the albie.

The fabric thus obtained has the following values of the physico-mechanical characteristics;

Features U.M. Values obtained Link cloth Link atlas 2/1 diagonal connection Diagonal connection 2 / I adjusted Table g / m ² 215 ... 220 250 ... 270 240 ... 260 240 ... 260 Breaking load: - warp, min. daN 35 45 45 35 - beat, min. daN 30 40 40 30 Elongation at break: - warp, min. % 15 15 15 15 - beat, min. % 14 14 14 14 Thread size: - warp fire / 10 cm 150 ± 20 130 + 20 140 ± 20 160 ± 20 - beating fire / 10 cm 110 ± 20 120 + 20 110 + 20 120 ± 20

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Tests on the fire behavior of fabrics made of 50% synthetic flame retardant acrylic fibers and 50% wool fibers, carried out by both methods, fall under flame propagation index 3 and fuel class C-1.

Claims (4)

1. Fabric for protective materials, resistant to aggressive environments, characterized in that it is formed both in warp and in the fabric of 100% thermostabilized acrylic flame retardant synthetic fibers, twisted, connected by a 2/2 diagonal connection, with a cut width of 160 threads / 10 cm or 200 threads / 10 cm, with 4 threads in the box and with a straight clearance of the warp threads in 4 axes. 2. Fabric for protective materials, resistant to aggressive environments, according to claim 1. Characterized in that, in one embodiment, it is formed in both warp and in flame retardant yarn obtained from a mixture of 50%. synthetic flame retardant acrylic fibers and 50% wool fibers, linked by a modified 2/1, 2/2 diagonal link, atlas or canvas. 3. Process for making the fabric for protective materials, resistant to aggressive environments, from claim 1, characterized in that the brush-steaming operations are carried out, washed on the machine in a continuous flow with 4 tanks, dried at 100 ° C, at night, brush-cut a passage right and tread on the press with the riverbed. 4. Process according to claim 3, characterized in that the brush-steaming operations are carried out, washed in rope, folded, smoothed-fixed at 65 ° C and then cold, dried at 120 ° C, brushed - trimming a passage, ironing in the press with the albie.