Composition for fire-proof treatment of polyamide fibres

FIELD: chemistry.

SUBSTANCE: composition contains the following in pts. wt: methylphosphite borate 15, water 85, triethanolamine 0.25 and copper sulphate 0.38-1.50.

EFFECT: high fire-resistance, strength, resistance to thermal-oxidative decomposition and endowing polyamide fibre with high strength of binding with isoprene rubber.

2 tbl, 4 ex

 

The invention relates to the textile industry, the fire retardant compositions of the processing of synthetic fibers, and can be used in aircraft, automotive, rubber industry and for other special purposes.

Known composition for flame-retardant finishing of textile materials of cellulose fibers, comprising the product of the interaction of nitrilotriethanol acid with a nitrogen-containing compound, and water, and as a nitrogen-containing substances it contains urea (U.S. Pat. 2184184 Russia, D06 13/432; publ. 27.06.01).

However, the application of this composition requires drying the impregnated fabric at a high temperature, and is intended only for materials of cotton, linen and viscose fibers.

Known flame retardant composition for the treatment of textile materials, including the derived florentikoli acid and an organic solvent, with the aim of increasing the fire resistance of the materials of the polyamide or cellulose fibers it contains antimony trioxide (copyright certificate 953045 the USSR, D06 13/20; publ. 23.08.82).

However, this composition is complex recipe, and the solvent used toxic substance.

Also known composition for flame-retardant finishing of fibers on the basis of 5-7%aqueous solution of phosphate monomial is a (Facil-M) using redox of Fe 2+-H2O2(application for the invention 93012912 Russia; publ. 20.09.96).

However, this composition should be impressed on the fiber for a long time and at high temperatures.

Closest to the invention to the technical essence is a composition for fire-retardant treatment of polyamide fibers, comprising the phosphorus-containing compound, water, and additionally used polyethylenepolyamine (patent 2344215 Russia D06M 13/50; publ. 20.01.2009).

However, this composition does not provide a high strength fibers, resistance to thermo-oxidative degradation, in addition, its preparation is accompanied by severe heat.

Task: to develop a composition for fire-retardant treatment of polyamide fibers for increased fire resistance and physical-mechanical properties of the fibers.

The technical result is to increase the fire resistance, durability, resistance to thermo-oxidative degradation and giving polyamide fiber of high strength connection with rubber-based isoprene rubber.

The technical result is achieved in that the composition for fire-retardant treatment of polyamide fibers, comprising the borate methylphosphate and water, and optionally - triethanolamine and copper sulfate in the following ratio of components, parts by weight: borate methylphosphate - 15,00, water - 85,00, triethanolamine - 0,25, Sul is phat copper - 0,38-1,50.

We found that the reason for increasing the fire resistance of polyamide fibers is the formation of thin fire retardant film on the surface of the fibers, which inhibits the combustion process due to the formation of the foam layer with better conductivity, which limits the flow of oxygen to the source of combustion.

Increasing the strength of the fiber due to the localization of micro defects on the surface impregnating composition, as microdefects are the root cause of the destruction of the fiber when exposed to external stresses.

The adhesion of the polyamide fibers to rubber increases, apparently, due to the emergence of new polar functional groups on the surface of the fibers, which come into physical interaction with an isoprene rubber.

The borate methylphosphate previously used for fire-resistant modification of cellulose materials (patent RF 2254341 C1 SW 15/05, publ. 20.06.05).

Triethanolamine (TU 6-02-916-79) is used as absorbent "sour" gases as raw materials for surfactants, pharmaceuticals and cosmetics.

Copper sulphate (TU 2141-024-05774969-2003) used as a stain in the dyeing of textile materials, for preserving wood, seed treatment, as a pesticide, antiseptic and astringent drug, pigment in paints, for making skins.

Use this with the tava simplify the modification of polyamide fibers. So, to achieve a positive effect not require the use of highly concentrated fire retardants and cooling of the prepared composition. Using 15%aqueous solution of borate methylphosphate optimally. The decrease in the concentration of borate methylphosphate is not possible to achieve the effect of extinguishing, and the increase in concentration reduces the strength of the fibers.

By reducing or increasing the content of triethanolamine in flame retardant composition deteriorate flame retardant and mechanical properties of polyamide fibers.

When increasing or decreasing content in the impregnating composition of copper sulfate decreases the resistance of the fiber and decreases the strength polyamide fiber.

It should be noted that the use of this composition for fire-retardant treatment of polyamide fibers does not require high temperatures and complex hardware design.

Example preparation of flame retardant modifying composition.

In a reactor with a stirrer, containing 15%aqueous solution of borate methylphosphate, poured with stirring triethanolamine. Stirring is carried out for 1-2 minutes at room temperature, then add the copper sulfate and stirred for 5 minutes.

Get impregnating compounds 1-4, the formula of which is given in table 1.

Compounds 1-4 propityvaet for 1 minute polyamide cord brand 25 science and technology committees 1877 Tex x1 x2 and dried at room temperature (20C) to constant weight. Then termostatic for 30 minutes at 100C.

The invention is illustrated by the following examples.

Example 1. Samples of polyamide fibers (length 20 cm) is placed for 1 minute in a 15%aqueous solution of borate methylphosphate, previously neutralized with triethanolamine to ph 7 and containing 0,38 parts by weight of copper sulfate, followed by drying at room temperature, then hold the temperature for 30 minutes at 100C.

Examples 2-4 carried out as in example 1, changing the contents of sulphate of copper.

The samples are subjected to research on resistance to burning (GOST 21793-76), the strength at the discontinuous voltage (GOST 20403-75), resistance to thermo-oxidative degradation (tests were carried out at 500C for 30 minutes). The bond strength of impregnated cord with rubber-based isoprene rubber (PHEV and other General technology of rubber. - M.: Chemistry, 1978. - p.57) was determined by N-method (GOST 23785.7-89) on a tensile testing machine RMI-60. The results are shown in table 2.

The table shows that with increase in the content of copper sulfate improved physico-mechanical properties of modified fibers. Thus, in the processing of polyamide fibers flame retardant prescription 4 breaking load is increased from 26.6 kgs to 34.7 kg. In addition, the modified fibers exhibit higher durability is to thermo-oxidative degradation. The presence of the coke residue of 7.7% at 500C in polyamide fibers testifies to the effective action of the flame retardant composition as catalyst coke formation during thermal oxidative degradation of the investigated fibers. The use of this composition increases the bond strength polyamide fiber with rubber, based on isoprene rubber, from 4.2 to 4.7 kgf kgf when using the composition according to recipe 4.

Table 1
IngredientsThe content of components, parts by weight
1234
The borate methylphosphate15,0015,0015,0015,00
Water85,0085,0085,0085,00
Triethanolamine0,250,250,250,25
The copper sulfate0,751,131,50

Adhesion to rubber, kgf
Table 2
PropertiesEx. fiberIndicators for songs
1234
The breaking load, kgf26,628,628,532,534,7
Elongation, mm29,335,334,736,035,7
Fireburnsfade outfade outfade outfade out
Coke residue (500C 30 minutes)06,27,77,66,2
4,24,34,54,4the 4.7

Technical and economic effect obtained from the application of this composition is that its application can significantly improve the fire resistance, durability, resistance to thermo-oxidative degradation and adhesion to the rubber-based isoprene rubber polyamide fibers, to reduce the consumption of reagents, does not require complex hardware design, long processing time, which avoids mnogostadiinost processing.

The composition for fire-retardant treatment of polyamide fibers, comprising the borate methylphosphate and water, characterized in that it additionally contains triethanolamine and copper sulfate in the following ratio of components, parts by weight:

The borate methylphosphate15,00
Water85,00
Triethanolamine0,25
The copper sulfate0,38-1,50



 

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