Composition for fire-proof treatment of synthetic fibres

FIELD: chemistry.

SUBSTANCE: composition for fire-proof treatment of synthetic fibres contains the following in pts. wt: methylphosphite borate 20.0-35.0, water 65.0-100.0, ammonia 15.0-25.0, polyacrylamide 15.0-25.0 and potassium persulphate 0.5-1.5.

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

2 tbl, 6 ex

 

The invention relates to the textile industry, in particular, compositions flame retardant 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 (patent 2184184, Russia, D06 13/432, publ. 27.06.01).

However, the application of this composition requires drying the impregnated fabric at a high temperature, because it 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 (copyright certificate 953045, 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 the phosphorus is terasawa monomer (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, including fosforsoderzhashchie connection and water, and additionally used polyethylenepolyamine (patent 2344215, Russia, D06M 13/50, publ. 20.01.2009).

However, this structure gives a high resistance to thermo-oxidative degradation, a significant increase in the strength of the fibers.

Task: to develop a composition for fire-retardant treatment of synthetic fibers for increased fire resistance and physical-mechanical properties and adhesion of the fibers to the rubber-based isoprene rubber.

The technical result is to increase the fire resistance, durability, resistance to thermo-oxidative degradation and making synthetic fibers high-strength connection with rubber-based isoprene rubber.

The technical result is achieved in that the composition for fire-retardant treatment of synthetic fibers, including borate methylphosphate and water further comprises ammonia, polyacrylamide and potassium persulfate in the following ratio of components, parts by weight: borate methylphosphate - 20,0-35,0, in the Yes - 65,0-100,0, ammonia - 15,0-25,0, polyacrylamide - 15,0-25,0, potassium persulfate and 0.5 to 1.5.

We found that the reason for increasing the fire resistance of synthetic 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.

Adhesion of synthetic 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 chloroprene rubber.

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

Ammonia (GOST-6221-90) is used for the production of nitrogen fertilizers (nitrate and ammonium sulfate, urea), explosives and polymers, nitric acid, soda.

Polyacrylamide (TU 6-01-1049-92) is used as a gelling, foaming agent, flocculant and coagulant.

The potassium persulfate (TU 38.103270-87) is designed to primeneniyu as an accelerator of polymerization and condensation upon receipt of synthetic rubbers, latex and plastics, for bleaching various substances in laboratory practice and other

The application of this composition makes it easy to carry out a modification of synthetic fibers. The use of 20.0 parts by weight of the borate of methylphosphate for polyamide and 20.0-35,0 polyester fibers optimally. A reduction in the content of the borate methylphosphate is not possible to achieve the effect of extinguishing, and the increase in the content helps to reduce the strength of the fibers.

Use 15,0-25,0 parts by weight of ammonia for polyester fibers and to 18.0 parts by weight for polyamide fibers optimally. By reducing or increasing the ammonia content in the flame retardant composition deteriorate flame retardant and mechanical properties of synthetic fibers, as is changing the acidity of the environment.

Use 22,0-25,0 parts by weight of polyacrylamide for polyester fibers and 15.0 parts by weight for polyamide fibers optimally. With the increasing content in the impregnating composition of polyacrylamide decreases the resistance of the fiber and decreases with decreasing strength synthetic fiber and resistance to leaching impregnating composition from the surface of the fiber.

The use of potassium persulfate 0.5 to 1.0 parts by weight for polyester fibers and 0.5 to 1.5 parts by weight for polyamide fibers optimally. The decrease in the concentration leads to incomplete polymerization in which acrylamide, and the increase will lead to an increase in the content of unreacted compounds.

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 enter the estimated number of borate methylphosphate and water, then poured with stirring ammonia. Stirring is carried out for 1-2 min at room temperature, then add the polyacrylamide and potassium persulfate and mix contents 5 minutes

Get impregnating compounds 1-6, the formula of which is given in table 1.

Compounds 1-3 soaked for 1 min polyester cord brand 18 RC - 144 Tex, compounds 4-6 impregnated with polyamide cord brand 25 science and technology committees 1877 Tex x1 x2 and dried at room temperature (20°C) to constant weight. Then termostatic for 30 min at 100°C.

The invention is illustrated by the following examples.

Example 1.

Samples of polyester fibers (length 20 cm) is placed for 1 minute in an impregnating composition containing of 20.0 parts by weight of the borate of methylphosphate, and 100.0 parts by weight of water, of 15.0 parts by weight of ammonia, of 22.0 parts by weight of polyacrylamide and 0.5 parts by weight of potassium persulfate, followed by drying at room temperature, then hold the temperature for 30 min Ave is 100°C.

Examples 2-3 carried out as in example 1, changing the content of the borate methylphosphate, water, ammonia, polyacrylamide and potassium persulfate.

Example 4.

Samples of polyamide fibers (length 20 cm) is placed for 1 minute in an impregnating composition containing of 20.0 parts by weight of the borate of methylphosphate, 80,0 parts by weight of water, 18 parts by weight of ammonia, of 15.0 parts by weight of polyacrylamide and 0.5 parts by weight of potassium persulfate, followed by drying at room temperature, then hold the temperature for 30 min at 100°C.

Examples 5-6 carried out according to example 4, by changing the content of potassium persulfate.

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 500°C for 30 min). 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 the modified fibers are more resistant to thermo-oxidative degradation. For example, the presence of the coke residue of 12.7% and 12.5 at 500° from polyamide fibers recipes 5 and 6 show an effective action of a flame retardant composition as catalyst to the soobrazhenija during thermo-oxidative degradation of the investigated fibers. The use of this composition increases the bond strength polyester fiber with rubber, based on isoprene rubber, from 5.0 to 9.3 kgf kgf when using the composition according to recipe 1, and polyamide fibers from 4.3 to 5.6 kgf kgf when using recipe 4. It also increases the strength of the fibers. So when using composition 1 strength polyester fiber increases with 24,0 to 28.9 kg, and the use of composition 4 strength polyamide fiber increases with 23,0 to 32.3 kg. The gain does not exceed 25%.

Table 1
IngredientsComponent content, %
123456
Polyesterpolyamide
The borate methylphosphate20,030,035,020,020,020,0
Water100,0 70,0065,080,080,080,0
Ammonia15,023,025,018,018,018,0
Polyacrylamide22,025,025,015,015,015,0
The potassium persulfate0,51,01,00,51,01,5

9,3
Table 2
PropertiesIndicators for songs
polyesterpolyamide
Ex.123Ex.4 56
The breaking load, kgf24,028,927,026,023,032,3of 31.830,8
Elongation, mm28,036,035,53439,041,739,741
FireBurnsFade outFade outFade outBurnsFade outFade outFade out
Coke residue, % (500°C, 30 min)011,39,58,707,2a 12.712,5
Adhesion to rubber, kgf5,07,68,64,35,64,84,5
Gain, %-18,525,024,0-12,815,819,0

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

The composition for fire-retardant treatment of synthetic fibers, including borate methylphosphate and water, characterized in that it contains more ammonia, polyacrylamide and potassium persulfate in the following ratio of components, parts by weight:

tr>
The borate methylphosphate20,0-35,0
Water65,0-100,0
Ammonia15,0-25,0
Polyacrylamide15,0-25,0
The potassium persulfate0.5 to 1.5



 

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