Method of modifying synthetic fibre

FIELD: chemistry.

SUBSTANCE: method involves grafting onto a synthetic fibre a phosphorous containing monomer at room temperature for a period of 15 minutes and subsequent drying. The phosphorous containing monomer used is a 50% water solution of phosphorous-boron-containing methacrylate, neutralised with a solution of ammonia to pH 7. Grafting is done in the presence of a sodium persulphate initiator, taken in quantity of 1-5% mass of phosphorous-boron-containing methacrylate.

EFFECT: simplification of the technological process of obtaining modified synthetic fibre; their increased fire resistance; strength and resistance to thermo-oxidative breakdown.

1 tbl, 6 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.

There is a method of flame retardant finishing of textile materials of cellulose fibers, which consists in the impregnation composition comprising the product of the interaction of nitrilotriethanol acid with a nitrogen-containing compound, and water, at a temperature of 30-70°C for 3-10 and squeezed to a wet weight gain 80-90%. Then the material is subjected to drying at 90-220° (U.S. Pat. 2184184 Russia, D06 13/432; Publ. 27.06.01).

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

There is a method of flame-retardant treatment of textile materials which consists in impregnating samples of nylon fabric and cotton knitted fabric composition containing the derived florentikoli acid and an organic solvent, in management at 20°C for 5 minutes, followed by drying in air (Copyright certificate 953045 the USSR, D06 13/20; Publ. 23.08.82).

However, this method will use a multicomponent modifier composition together with harmful to the environment and health the rd person with a solvent.

Closest to the invention to the technical essence is a method of obtaining a flame-retardant chemical fibers by grafting to cellulose or synthetic fibers from 5-7-percentage aqueous solutions of phosphate monomer (Facil-M) at a temperature of 80-90°C for 90-120 min using a redox system Fe2+-H2About2(Application for the invention 93012912; Publ. 20.09.96).

However, this method of obtaining a flame-retardant chemical fiber long time and requires a high temperature.

Task: to develop a method of obtaining modified synthetic fibers that do not require complex equipment, high temperatures, not a long time and allows to obtain products with high fire resistance and water absorption.

The technical result is a simplification of the method of obtaining modified synthetic fibers, increasing their fire resistance, durability and resistance to thermo-oxidative degradation.

The technical result is achieved in that the modification of synthetic fibers is the inoculation of phosphate monomer, followed by drying, and as the phosphorus-containing monomer is used 50%aqueous solution phosphoriboisomerase methacrylate, pedwar the positive neutralized with aqueous ammonia to ph 7, inoculation is carried out in the presence of the initiator is sodium persulfate, taken in an amount of 1-5% by weight phosphoriboisomerase methacrylate, while the inoculation was performed at room temperature for 15 minutes.

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 of phosphorus containing monomer 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. The increase in strength is achieved by pre-neutralization of an aqueous solution phosphoriboisomerase methacrylate to a neutral environment and its subsequent inoculation into 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 flame retardant composition, is introduced into a solution of phosphate methacrylate to initiate polymerization.

This method allows to significantly simplify the modification of synthetic fibers. So, to achieve positive the wow effect does 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 the increase in concentration is not advisable.

Pre-neutralization of the ammonia aqueous solution phosphoriboisomerase methacrylate to ph 7 necessary to prevent degradation of synthetic fibers.

Adding an aqueous solution of 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.

When reducing time modification of synthetic fibers is less than 15 minutes with a solution phosphoriboisomerase methacrylate significantly reduced flame retardant effect. Further increase of the modification time more than 15 minutes is not advisable, since the degree of fire protection is not changed. It should be noted that this modification does not require high temperatures and complex hardware design.

The treatment is carried out as follows: initial samples of synthetic fibers treated with 50%aq is m solution phosphoriboisomerase methacrylate, pre-neutralized with ammonia to ph 7 and containing sodium persulfate as an initiator. Under the weight phosphoriboisomerase methacrylate mean its a 50%aqueous solution. The treatment is carried out for 15 minutes at room temperature and dried to constant weight.

The invention is illustrated by the following examples.

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

Examples 2-6 are carried out according to example 1, varying the amount of initiator is sodium persulfate.

The obtained samples were 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 thermoanalytical destruction (tests were performed at temperatures of 300-600°). The results are shown in table 1.

The table shows that with the increase in the number of initiator improved physical and mechanical properties of synthetic fibers. So, with the introduction of the initiator in the amount of 1.0 to 5.0% by weight phosphoriboisomerase methacrylate tensile loading is ka polyamide fibers increases from about 30.0 to 32.0 kgf kgf. In addition, the treated 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 and 87.1 at 300°and 22.4% at 600°With polyester fiber testifies to the effective action of phosphorus-containing monomer as a catalyst coke formation during thermal oxidative degradation of the investigated fibers.

Compounds 1-3 impregnated with polyamide cord 30A thread patterns 188 Tex ×1×2 (TC 6-06-With-04-95) and polyester cord 20 POINTS from threads 111 Tex ×1×3 (TU 6-12-31-03-95).

Use as a modifier of an aqueous solution phosphoriboisomerase methacrylate avoids mnogostadiinost or subsequent processing of modified materials. When processing synthetic fibers phosphoriboisomerase methacrylate is a radical graft polymerization phosphoriboisomerase methacrylate to the fiber that prevents water washout and the effect lasts for fire protection.

Table 1
No. of sample examplesThe amount of initiator, %The breaking load, kgfElongation, mmThe relative breaking load, kg is/Tex Water 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
35,025,616,052,861,0 87,122,4

Technical and economic effect obtained from the use of this modification, is that its application can significantly improve the fire resistance of synthetic fibers, does not require sophisticated equipment, high temperatures, not a long time and avoids mnogostadiinost through the use of phosphoriboisomerase methacrylate, containing in its structure as phosphorus and boron.

Modification of synthetic fibers by grafting phosphorus-containing monomer, followed by drying, characterized in that the phosphorus-containing monomer is used 50%aqueous solution phosphoriboisomerase methacrylate, previously neutralized with aqueous ammonia to pH 7, the inoculation is carried out in the presence of the initiator is sodium persulfate, taken in an amount of 1-5% by weight phosphoriboisomerase methacrylate, while the inoculation was performed at room temperature for 15 minutes



 

Same patents:

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

FIELD: textile industry, in particular, textile material finishing processes for imparting hydrophilic properties, reducing electrolyzing capacity and rendering high resistance to the action of various chemical substances to synthetic textile materials such as filaments, threads, cloths.

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1 tbl, 6 ex

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1 tbl, 18 ex

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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.

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2 tbl, 3 ex

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2 tbl, 3 ex

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5 tbl, 3 ex

FIELD: chemistry.

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2 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: method involves grafting onto a synthetic fibre a phosphorous containing monomer at room temperature for a period of 15 minutes and subsequent drying. The phosphorous containing monomer used is a 50% water solution of phosphorous-boron-containing methacrylate, neutralised with a solution of ammonia to pH 7. Grafting is done in the presence of a sodium persulphate initiator, taken in quantity of 1-5% mass of phosphorous-boron-containing methacrylate.

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1 tbl, 6 ex

FIELD: chemistry.

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EFFECT: enhanced cosmetic and rejuvenating effect.

8 cl, 1 dwg, 1 ex

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

FIELD: chemistry.

SUBSTANCE: method involves grafting onto a synthetic fibre a phosphorous containing monomer at room temperature for a period of 15 minutes and subsequent drying. The phosphorous containing monomer used is a 50% water solution of phosphorous-boron-containing methacrylate, neutralised with a solution of ammonia to pH 7. Grafting is done in the presence of a sodium persulphate initiator, taken in quantity of 1-5% mass of phosphorous-boron-containing methacrylate.

EFFECT: simplification of the technological process of obtaining modified synthetic fibre; their increased fire resistance; strength and resistance to thermo-oxidative breakdown.

1 tbl, 6 ex

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