Mixture for fire-proof processing of synthetic fibres

FIELD: chemistry.

SUBSTANCE: mixture for the given processing contains a 50% water solution of phosphorous-boron-containing methacrylate, neutralised by ammonia to pH 7 and a sodium persulphate initiator in quantity of 1-5% mass of phosphorous-boron-containing methacrylate with the following mass ratios of the components: phosphorous-boron-containing methacrylate - 50.0, water - 50.0, ammonia - 22.0, sodium persulphate - 1.0-5.0.

EFFECT: increased fire-resistance; strength and resistance to thermo-oxidative breakdown.

2 tbl, 3 ex

 

The invention relates to the textile industry, to methods of fire-retardant treatment 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. Russia 2184184 , D06 13/432, publ. 27.06.01).

However, the application of this composition requires drying the impregnated fabric at a high temperature and is only suitable 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 (USSR Author's certificate 953045, D06 13/20, publ. 23.08.82).

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

Closest to the invention to the technical essence is a composition for flame-retardant finishing of fibers on the basis of 5-7%of the CSOs aqueous solution of phosphate monomer (Facil-M) using redox of Fe 2+-H2About2(Russia's claim to the invention 93012912, publ. 20.09.96).

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

Task: to develop a composition for fire-retardant treatment of synthetic fibers for increased fire resistance, durability and water absorption of synthetic fibers.

The technical result is to increase the fire resistance, durability and resistance to thermo-oxidative degradation of synthetic fibers.

The technical result is achieved in that the composition for fire-retardant treatment of synthetic fibers include phosphorus-containing monomer, and as a phosphorus-containing monomer, it contains 50%aqueous solution phosphoriboisomerase methacrylate, previously neutralized with ammonia to pH 7, and additionally as the initiator of the sodium persulfate in the amount of 1-5% by weight phosphoriboisomerase methacrylate in the following ratio of components, parts by weight: phosphoriboisomerase methacrylate - 50,0, water - 50,0, ammonia - 22,0, sodium persulfate and 1.0 to 5.0.

We have found that the reason for the increase of fire resistance, durability and resistance to thermo-oxidative degradation of synthetic fibers is a radical graft polymerization phosphoriboisomerase acrylic synthetic fiber.

The presence phosphoriboisomerase methacrylate atoms of phosphorus and boron, which are inhibitors of combustion and oxidation, allows to improve the fire resistance of the fibers, as well as to increase their resistance to thermo-oxidative degradation. Increasing the strength of the synthetic fibers is achieved by pre-neutralization of an aqueous solution phosphoriboisomerase methacrylate to a neutral environment to pH 7 and its subsequent inoculation on synthetic fibers.

Phosphoriboisomerase methacrylate formerly known as the fire retardant film materials based on polyvinyl alcohol (RF Patent 2254327, SS 69/54, publ. 20.06.05).

The sodium persulfate initiator contained in the composition for fire-retardant treatment of synthetic fibers, is introduced into a solution of phosphate monomer to initiate polymerization.

The application of this composition allows to significantly simplify the modification of synthetic fibers. So, to achieve a positive effect not require the use of a multi-component, highly concentrated flame retardants. The use of a 50%aqueous solution phosphoriboisomerase methacrylate optimally. The decrease in the concentration phosphoriboisomerase methacrylate is not possible to achieve the effect of extinguishing, and an increase in the concentration impractical.

PR is varicella neutralization with ammonia 50%aqueous solution phosphoriboisomerase methacrylate to pH 7 necessary to prevent degradation of synthetic fibers.

Adding 50%aqueous solution phosphoriboisomerase methacrylate initiator in the amount of 1-5% by weight phosphoriboisomerase methacrylate optimally. Reducing the number of initiator does not provide full vaccination phosphoriboisomerase methacrylate on fiber. The increase in the number of initiator does not influence vaccinated phosphoriboisomerase methacrylate in fiber.

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

Example preparation of flame retardant modifying composition.

In a reactor with a stirrer, containing 50%aqueous solution phosphoriboisomerase methacrylate, poured with stirring, a solution of ammonia to neutralize the composition to pH 7, then add the sodium persulfate as an initiator in the amount of 1-5% by weight phosphoriboisomerase methacrylate. Under the weight phosphoriboisomerase methacrylate mean its a 50%aqueous solution. Stirring is carried out for 5 minutes at room temperature. Get impregnating compounds 1-3, the formula of which is given in table 1.

Compounds 1-3 soaked for 15 minutes polyester cord 20 POINTS from threads 111 Tex ×1×3 (TU 6-12-31-03-95) and polyamide cord 30A thread patterns 188 Tex ×1#x000D7; 2 (TC 6-06-With-04-95) and dried at room temperature (20° (C) to the total mass.

The invention is illustrated by the following examples.

Example 1. Samples of synthetic fibres (length 20 cm) is placed for 15 minutes in a 50%aqueous solution phosphoriboisomerase methacrylate, previously neutralized with aqueous ammonia to pH 7, containing 1% initiator is sodium persulfate, followed by drying at room temperature.

Examples 2-3 carried out as in example 1, varying the amount of initiator is sodium persulfate.

The samples are subjected to research on resistance to burning (GOST 21793-76), the strength at the discontinuous voltage (GOST 20403-75), water absorption (GOST 4650-65), resistance to thermo-oxidative degradation (tests were performed at temperatures of 300-600°). The results are shown in table 2.

The table shows that with the increase in the number of initiator improved physico-mechanical properties of modified fibers. So, with the introduction of the initiator in the amount of 1.0 to 5.0% by weight phosphoriboisomerase methacrylate breaking load polyamide fibers increases from about 30.0 to 32.0 kgf. In addition, the modified fibers are more resistant to thermo-oxidative degradation. The presence of significant coke residue 74,0% at 300°and 13.3% at 600°With the polyamide fiber is 87,1 at 300° With and 22.4% at 600°With polyester fiber testifies to the effective action phosphoriboisomerase methacrylate as a catalyst coke formation during thermal oxidative degradation of the investigated fibers.

Use as a flame retardant composition of 50%aqueous solution phosphoriboisomerase methacrylate avoids mnogostadiinost or subsequent processing of the modified fibers. When processing synthetic fibers phosphoriboisomerase methacrylate is a radical graft polymerization phosphoriboisomerase methacrylate to the fiber that prevents water washout and preserves the effect of the fire.

Table 1
ComponentThe content of components, parts by weight, in the composition
123
Phosphoriboisomerase methacrylate50,050,050,0
Water50,050,050,0
Ammonia22,022,022,0
The sodium persulfate1,01,55,0

tr>
That the face 2
No. of sample examplesThe amount of initiator, %The breaking load, kgfElongation, mmThe relative tensile strength, kgf/TexWater absorption, %Coke residue, %
300°600°
Polyamide fiber
Without impregnation018,918,344,09,0--
11,030,044,049,579,652,011,0
21,531,037,054,684,963,012,5
35,032,031,762,3of 87.374,013,3
Polyester fiber
Without impregnation020,016,0to 49.97,010,01,0
11,026,015,054,643,0to 75.220,0
21,525,915,054,359,086,120,6
35,025,616,052,861,087,122,4

Technical and economic effect obtained from the application of this composition is that its application can significantly improve the fire resistance, durability and resistance to thermo-oxidative degradation of synthetic fibres, does not require complex hardware design, high temperature and processing time and avoids mnogostadiinost through the use of phosphoriboisomerase methacrylate, containing in its structure as phosphorus and boron.

The composition for fire-retardant treatment of synthetic fibers, comprising the phosphorus-containing monomer, characterized in that the phosphorus-containing monomer, it contains 50%aqueous solution phosphoriboisomerase methacrylate, previously neutralized with ammonia to pH 7 and additionally as initiator sodium persulfate in the amount of 1-5% by weight phosphoriboisomerase methacrylate in the following ratio of components, parts by weight:

Phosphoriboisomerase methacrylate50,0
Water50,0
Ammonia22,0
The sodium persulfate1,0-5,0



 

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2 tbl, 6 ex

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2 tbl, 4 ex

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2 tbl, 6 ex

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