Method of producing fibres, threads, films from heterocyclic aromatic polyamidoimides, containing benzimidazole fragments, and fabric based on said threads
SUBSTANCE: method involves preparation of two solutions of a mixture of 5(6)-amino-2(para-aminophenyl)benzimidazole with 5(6)-amino-2(para-iminoquinone)benziimide in dimethylacetamide which contains lithium chloride, and then addition of paraphenylenediamine and an equimolar amount of terephthaloyl chloride to the first solution, and to the second solution - an equimolar amount of a dianhydride of pyromellitic acid. Said solutions are mixed at room temperature until formation of a spinning solution with dynamic viscosity of 300-600 P and concentratio of 3.5-4.0 wt %. The solution is filtered, vacuum treated and formed in a water-salt or water-alcohol settling bath, dried and thermally treated in free state. Industrial fireproof ballistic fabric is then produced from the obtained fibres. Threads obtained according to the invention have elementary fibre diametre higher than 10 mcm, rupture resistance not lower than 280 cN/tex and relative elongation of 3.8-4.5%.
EFFECT: invention enables to obtain fibres, threads, films with high elasticity while retaining good strength properties.
2 cl, 3 tbl, 4 ex
The invention relates to a technology for obtaining molded products in the form of fibres, filaments or films made of synthetic polymers, in particular of heterocyclic aromatic polyamidoimides containing benzimidazole fragments, and can be used for the production of fabrics for special purposes or composite materials.
1. A method of obtaining the threads of heterocyclic aromatic polyamide, comprising the synthesis of aromatic depolimerizatia based on 5(6)-amino-2-para-aminobenzimidazole, para-phenylenediamine, terephthaloylchloride with the prior dissolution of the diamines, cooling solution to 15-20°C, the addition of first 80-92% of the equimolar ratio terephthaloylchloride, and then after stirring for 30 minutes the introduction of gradually cooling the remaining quantity terephthaloylchloride. The obtained 3,5-5,0%solution after filtration and deaeration is formed in a precipitation of water-dimethylacetamide bath with negative spunbond hood, subjected to orientation stretching, drying and heat treatment under vacuum at 340-360°C (EN 2277139 C1, published. 27.05.2006).
The resulting yarn has a tensile strength of up to 270 g/Tex, ultimate tensile stress in the micro-plastic up to 600 kgf/mm2.
However, in the above analogy, the filament has a tensile strength of not more than 27 g/Tex and elongation in the range of 2.5-3.0%.
2. A method of obtaining heat-resistant polyimide film of polyamidoamine salts based on various dianhydrides aromatic tetracosanoic acids, including pyromellitates of dianhydride, irrigation solution on a substrate immersed in a precipitation bath, drying, and heat treatment (U.S. patent 6716270, published. 06.04.2004).
The polymer from which the film according to the specified method, only contains polyimide group, film intended for the manufacture of the separation membranes.
3. From the patent of the Russian Federation 2352595, publ. 20.04.2009, a method of obtaining a polyimide fibers of the polycondensation solution Polynicotinate. For polycondensation in the environment amide solvent, a mixture of diamines 4,41-diaminodiphenylamine and 5(6)-amino-2-para-aminobenzimidazole and a mixture of dianhydride 3,314,41-benzophenonetetracarboxylic acid dianhydride pyromellitic acid.
At the specified method at the stage of polycondensation of a mixture of 5(6)-amino-2-para-aminobenzimidazole and pyromellitates the dianhydride is injected to prevent studnyvrtane and stabilization technology.
4. Known fabric for the manufacture of ballisticheskih resistant articles made from filaments formed from a spinning solution of aromatic copolymer of a dibasic acid chloride of terephthalic what Islami and diamines benzimidazole and p-phenylenediamine (patent 2337304, published. 27.10.2008).
According to this patent the polymer, from which are made the thread contains only polyamideimide groups, and the filament has a filament diameter of not more than 10 μm.
5. A method of obtaining heat-resistant fibers or films of polyamidimide received high-temperature polycondensation with use of aromatic dicarboxylic acids or mixtures thereof and mixtures of dianhydrides trimellitates and pyromellitates acid (SU 359836 And published. 16.01.1973). These fibers have a strength 45-62 g/Tex and elongation of 5.5 and 11.8%.
According to the mentioned method of obtaining heat-resistant fibers pyromellitic dianhydride injected into the mixture of diisocyanates to increase the solubility of the spinning solution, the filaments have a low strength level 45-62 HS/Tex.
Technical problem on which this invention is directed, is to obtain fibers, filaments or films having high elasticity while maintaining the high strength characteristics, technically safe way.
The goal of the project is achieved by carrying out copolycondensation in amido-salt system on the basis of dimethylacetamide bifunctional reactive compounds a mixture of aromatic diamines and dianhydrides aromatic acids.
As aromatica is such diamines used a mixture of 5(6)-amino-2(para-AMINOPHENYL)benzimidazole (DFBI) 5(6)-amino-2(pair-imengine) bezdikian (AFDI) and p-phenylenediamine (PPD).
As dianhydrides aromatic acids using dichlorohydrin terephthalic acid (DHA) and pyromellitic diandre (KDP).
The polycondensation is carried out in the system cooled to 10°C dimethylacetamide containing lithium chloride to 4 wt.%. The polycondensation process consists of the stages of obtaining the solution of polyamides and solution polyamidation, their mixing.
Obtaining a solution of the polyamide includes sequential dissolution of the mixture of DAHBI and IFDI in the crystalline state in a mass ratio of 55:45-10:90 and after complete dissolution of the mixture adding PPD in the number of 0-0,3 molar fractions relative to the mixture of DFBI+IFDI and adding equimolar amount of DHA relative to the mixture of diamines.
Obtaining solution polyamidation includes sequential dissolution of the mixture of DAHBI and IFDI in the crystalline state in a mass ratio of(55:45)-(10:90) and after complete dissolution of the mixture adding equimolar amount duodenum relative to the mixture of diamines.
Getting the spinning solution spend 5-10 volume fraction of solution Polynicotinate in 90-95 volume fraction of solution of the polyamide at room temperature.
The spinning solution has a concentration of the polymer is 3.5-4.0 wt.% and a viscosity of at least 300 P.
The obtained spinning solution is filtered, obezvozhivani e.g. the keys on spinning in salt-water or water-alcohol bath. The obtained fibers, filaments and films are subjected plastification the hood no more than 20%, washed, dried at a temperature not higher than 120°C and thermoablative in the free state at a temperature not higher than 350°C., the polymer is characterized by the presence of polyamide, polemically, polyimide groups on the basis of benzimidazole.
Obtained according to the invention, the product contains these fragments, identified by the method of infrared polarization spectroscopy on the fluctuations of the characteristic absorption bands (table 1).
|No.||View radical||Connection type||Polarization||Frequency, cm-1|
Obtained according to the invention the filaments have a filament diameter of over 10 μm, a tensile strength not lower than 280 CN/Tex and elongation in the range of 3.8 to 4.5%.
From the obtained filaments or yarn on the basis of the declared product is made of fabric, high strength, heat resistant and ballistic properties. The invention is illustrated in the examples.
Example 1. 95 g of lithium chloride are dissolved 2.85 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 55:45 in number, 36,18 After complete dissolution the solution add 32,62 g DHA.
To prepare a second solution of 5 g of lithium chloride are dissolved in 0.15 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 55:45 in number 1,90 after complete dissolution the solution add 1,95 g duodenum. The solutions are mixed at room temperature and get spinning solution with a concentration of polymer of 3.85 wt.% and a viscosity of 450 P. After filtration and degassing spend formation through the die plate 200 by a wet method. The obtained filament is pulled to draw the hood -20%, dried at a temperature of 120°C and thermoablative at a temperature of 350°C. Data on the properties of the finished yarn are shown in table 2.
Example 2. 95 g of lithium chloride are dissolved 2.85 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 15:85 in number 26,88, After full is rastvoreniya in solution add PPD in the amount of 10.4 g, then enter 34,34 g DHA. To prepare a second solution of 5 g of lithium chloride are dissolved in 0.15 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 11:89 number of 1.41, After complete dissolution the solution add PPD in the amount of 0.55 g, then give 1.91 g of the duodenum.
The solutions are mixed at room temperature and get spinning solution with a concentration of the polymer 4.0 wt.% and a viscosity of 600 P. After filtration and degassing spend formation through the die plate 200 by a wet method. The obtained filament is pulled to draw the hood - 20%, dried at a temperature of 120°C and thermoablative at a temperature of 350°C. Data on the properties of the finished yarn are shown in table 2.
Example 3. 90 g of lithium chloride are dissolved in 2.7 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 20:80 in number 30,72, After complete dissolution the solution add PPD in the number 6,93 g, then enter 30,91 g DHA. To prepare a second solution of 10 g of lithium chloride are dissolved in 0.3 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 20:80 in number 3,41 after full Rast is orenia in solution add PPD in the amount of 0.37 g, then add 1,93 g WPC.
The solutions are mixed at room temperature and get spinning solution with a concentration of polymer of 3.7 wt.% and viscosity 404 P. After filtration and degassing spend formation through the die plate 200 by a wet method. The obtained filament is pulled to draw the hood -20%, dried at a temperature of 120°C and thermoablative at a temperature of 350°C. Data on the properties of the finished yarn are shown in table 2.
Example 4. 85 g of lithium chloride are dissolved in 2.55 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 25:75 in number 32,30, After complete dissolution the solution add 29,21 g DHA.
To prepare a second solution of 15 g of lithium chloride are dissolved in 0.45 l of dimethylacetamide (DMAA). Received amido-salt solvent is cooled to T=10°C and add the mixture of DAHBI and AFDI at a ratio of 25:75 in the amount of 5.7 after complete dissolution the solution was added 6.0 g of the KDP. The solutions are mixed at room temperature and get solution with the concentration of the polymer in 3.5 wt.% and a viscosity of 300 P. After filtration of conduct forming the film by the dry-wet method. The obtained film stretch hood -30%, dried at a temperature of 120°C and thermoablative at a temperature of 350°C. Data properties the am films are shown in table 2.
|The ratio of monomer components for polycondensation and properties of the obtained filaments and films|
|# example||The composition of the mixture||Elongation at break, %||Specific strength thread, CN/Tex|
|the diamines||dianhydride acids|
|PPD, mol. share||DAHBI, wt.%||AFDI, wt.%||DOSA, mol. share||KDP, mol. share|
|4 (film)||0||25||75||0,8||0,2||the 3.8||150 mV/mm2|
Example 5.From the obtained multifilament yarn with a linear density of 29 Teks with elementary fiber diameter of 14.3 μm on the weaving looms STB-180 produce fabric weave twill 2/2 with density in the warp and weft threads 212 10 cm and weighing 198 g/m2.
Performance fabrics are presented in table 3, indicate that the fabric has high strength, ballistic, fire-retardant properties.
|1||The breaking load of the fabric strips 50×200 mm, H
on the basis of
- at the ku
|2||Elongation at break, %|
on the basis of
|3||Tearing load strips of cloth size h mm, N|
|on the basis of||>100|
|4||Abrasion resistance, cycles|
|- on cloth||>30000|
|5||Ballistic resistance of the package V50m/s|
|-18 layers of fabric||537|
|- 30 layers of fabric||606|
|6||Fire is th (the dwell time in the flame 30)||No burns, no glow after removal of the flame|
1. A method of obtaining a molded product in the form of fibers, filaments, films of heterocyclic aromatic polyamidoimides containing benzimidazole fragments comprising preparing a first solution by dissolving a mixture of 5(6)-amino-2(para-AMINOPHENYL) benzimidazole, 5(6)-amino-2(pair-imengine) bezdikian mass ratio(55:45)-(10:90) cooled to 10°C dimethylacetamide, containing up to 4 wt.% lithium chloride, the addition first, 0-0,3 mol. share paraphenylenediamine in relation to the above-mentioned mixture, and then equimolar amount of dichlorohydrin terephthalic acid, preparing a second solution by dissolving a mixture of 5(6)-amino-2(para-AMINOPHENYL) benzimidazole, 5(6)-amino-2(pair-imengine) bezdikian mass ratio(55:45)-(10:90) cooled to 10°C dimethylacetamide, containing up to 4 wt.% lithium chloride, the addition of equimolar amount of dianhydride pyromellitic acid, a mixture of 90 to 95 volume fraction of the first solution with 5-10 volume fractions of the second solution at room temperature before the formation of the spinning solution with a dynamic viscosity of 300-600 CPS and a concentration of 3.5 to 4.0 wt.%, filtering the obtained spinning solution, degassing, molding in salt-water or water-alcohol Sagitullin the th tub, drying at a temperature not higher than 120°C. and the heat treatment in the free state at a temperature not higher than 350°C.
2. Technical fire resistant ballistic fabric made of filaments and/or yarns of heterocyclic aromatic polyamidoimides containing benzimidazole fragments obtained by the method according to claim 1.
SUBSTANCE: device contains convex elements, one of the surfaces of which is spherical and leans upon the protected surface. Convex elements are made of elastic material and connected between each other by connection straps that form ribs at the outer side and grooves at the side facing the protected surface.
EFFECT: increase of protection safety and elongation of the impact pulse in time.
FIELD: weapons and ammunition.
SUBSTANCE: proposed package comprises at least one plastic panel and at least one layer of textile fabric material secured to aforesaid panel and made from threads with fibers that feature ultimate strength of at least 900 MPa. Said plastic material represents self-hardening thermosetting plastic material made from threads, fibers, strips of band of polyolefin polymer. At least one layer of said fabric material is secured to said plastic material over its entire surface.
EFFECT: additional anti-shock effect.
13 cl, 3 tbl, 9 ex
FIELD: instrument making.
SUBSTANCE: rack for body armour vest protective properties evaluation comprises horizontal cylindrical container filled with water with diaphragm on its front side, percussive mechanism located in front of cylindrical container from the side of diaphragm with line of impact along the cylindrical container axis, and spherical manometre in cylindrical container with its centre on the line of impact. Rack comprises as well extension container, which is connected to cylindrical container through valve, with pressure source. Percussive mechanism is arranged in the form of differential lever and is equipped by detector differential lever springback and its penetration into cylindrical container. Rack may be equipped by horizontal guideways with frame on them, which has vertical guideways with stand for body armour vest fastening. Diaphragm can be made of rubber 2-2.5 mm wide.
EFFECT: invention provides unity of body armour vest protective prioperties quantitative evaluation in the case of impact on different areas of vest at different atmospheric pressure and temperature conditions.
3 cl, 1 dwg
FIELD: instrument making.
SUBSTANCE: rack for helmet protecive properties evaluation comprises platform with installed foundation, percussive mechanism for rack calibration, head model in the form of filled with water container with force-measuring sensor on a bar installed in it, neck model, expansion tank with its inlet connected to piping through valve with elastic container of head model, and its outlet is linked to excess pressure source. Platform is arranged in the form of cylindrical surface with its rotational centre on the impact direction line. Foundation comprises axle for neck model installation. It is mounted in slots of platform cylindrical surface and fixed on it by locks. Neck model is arranged with the possibility to rotate foundation axle, and it is fixed on foundation by locks. Head model container is elastic. Force-measuring sensor has spherical shape, besides centre of sensor is situated on intersection of platform cylindrical surface rotative axis and impact direction line.
EFFECT: rack provides unity of helmet protective prioperties quantitative evaluation in the case of impact on different areas of helmet in different operational conditions and atmospheric pressure variation.
FIELD: weapons and ammunition.
SUBSTANCE: fabric armor vest comprises chest and back sections furnished with packs made from aramide fabric TCBM arranged in bags. Anti-shock device consisting of damper and substrate is arranged on inner surface of aforesaid packs. Said damper is made from porolon with thickness making 1.12 of thickness of aforesaid pack made from aramide fabric TCBM. Said substrate is made from layer of flexibly connected square packs of aramide fabric layers glued together and a layer of 15-20 mm-thick shock dampeners glued on aforesaid packs and representing chambers made from airtight rubberised aramide fabric TCBM and housing porolon. Every shock dampener has one or several tightly closed holes with there are-to-dampener front area ratio not exceeding 1:8 to allow air efflux from said dampener when hitting element strikes against aforesaid pack.
EFFECT: armor vest integrity with no increase in vest weight.
5 dwg, 4 tbl
SUBSTANCE: steel contains carbon, silicon, manganese, chromium, nickel, molybdenum, vanadium, niobium, copper, sulphur, phosphor and iron, at following component ratio, wt %: carbon 0.38-0.43, silicon 0.50-0.80, manganese 0.30-0.50, chromium 1.20-1.50, nickel 0.90-1.20, molybdenum 0.75-0.85, vanadium 0.18-0.28, niobium 0.02-0.05, copper ≤ 0.30, sulphur ≤ 0.01, phosphor ≤ 0.01, the rest is iron.
EFFECT: steel of satisfactory welding capacity for the thickness of up to 20 mm, enhanced durability, high bullet-proof characteristic combined with reduced tendency to armour fragmentation under effect of modern weapons.
FIELD: weapons and ammunition.
SUBSTANCE: proposed armor vest comprises metal plate with inhomogeneous layer attached thereto. Said metal plate is made from high-strength steel or high-strength aluminium or titanium alloys. Said inhomogeneous layer has thickness not exceeding that of metal plate and is made from polymer binder containing irregular-shape particles with grain size of 0.1…1.5 mm and hardness exceeding that of thermally-hardened core material. Note here that larger particles are arranged in at least two rows over the layer thickness.
EFFECT: reduced weight, better protection.
3 cl, 2 dwg
SUBSTANCE: two versions of a multilayer packet are proposed. In the first version, the packet consists of layers with thickness not greater than 300 mcm. Each layer includes aluminium foil 1 and a porous ceramic film 2 on one or both sides of the foil 1 and integral with it. Thickness of the film 2 is equal to or greater than thickness of the foil, and the pores 3 are perpendicular to the surface of the layer. The layers of the packet are stuck together mainly by a film adhesive deposited on each layer on the entire surface. The porous ceramic film on the foil of any layer can be made through anodic coating in an electrolyte. In the second version pores 3 of the ceramic film 2 in each layer are partially or completely filled with nanoparticles 4 of tough metals or their alloys. Threadlike nanoparticles 4 with diametre of 0.01-0.20 mcm and length 10-200 mcm can be used.
EFFECT: increased ballistic stability of the packet.
11 cl, 2 dwg, 3 ex
FIELD: testing equipment.
SUBSTANCE: invention refers to methods of determination of protective properties of personal protective equipment. Method consists in the following: body is hit with normalised energy against unprotected model of object filled with liquid and also body is hit with specified energy against model of object protected by personal protective equipment; pressure in liquid, positive pulse of pressure in liquid and time change of positive pulse of pressure in liquid caused by hit are recorded. According to data obtained, functional relation of ratio of change of pressure positive pulse to time of its development for each hit is calculated and set up, positive extreme values of function F(t) are found, obtained values of positive extreme values are used for comparison. Function F(t) of hit against unprotected model by pendulum impact machine has one positive extremum Fkmax, and upon hit against protected model it has three positive extreme values. Comparison may be performed as per any of these three positive extreme values.
EFFECT: invention allows to improve accuracy of determination of parametres used for evaluation of effectiveness of personal protective equipment.
4 cl, 2 dwg
SUBSTANCE: invention relates to personnel bullet- and splinter-proof means, particularly to soft protective packs that make a part of armor vest. Proposed pack comprises front, central and rear layers of fabric weaves made from high-strength equal-linear density warps and weft aramide threads with equal lengthwise configuration, equal density of weave and twisting factor not exceeding 4. Front and rear fabric layers consist of single equal-density layers of woven threads and with equal surface density exceeding that of every central layer to form a structure symmetric about central layers, total surface density of front and rear layers vs total surface density of central layers varying from 0.32 to 2.85.
EFFECT: higher specific ballistic strength, reduced number of layers, hence, weight, and improved operating performances.
FIELD: process for producing of fully aromatic polyamide fibers comprising filler, in particular, aluminous mineral.
SUBSTANCE: fully aromatic polyamide fiber contains 100 weight parts of fully aromatic polyamide and from 0.05 to 20 weight parts of particles of aluminous mineral having laminated structure, such as hectorite, saponite, stevensite, beidellite, montmorillonite, and swelling mica.
EFFECT: improved mechanical properties of fibers, which may be provided with technological stability at fiber forming stage.
17 cl, 1 dwg, 3 tbl, 7 ex
FIELD: processes for producing of fibers, fibrids and articles from said fibers and fibrids, in particular, non-woven products, paper, and may be used for manufacture of electric insulation.
SUBSTANCE: articles are reinforced with fibers and/or fibrids produced from mixture of thermally stable polymers - aromatic polyamides, aromatic polyamide-imide resins or polyimide resins and thermoplastic polymers - polysulfides, polysulfones. Method involves reinforcing articles by thermal pressing at temperature exceeding glass transition temperature of thermoplastic polymer.
EFFECT: improved mechanical properties and air permeability and high processability.
23 cl, 2 dwg, 7 tbl, 20 ex
FIELD: production of thermally- and fire-resistant textile materials, in particular, materials produced from mixture of thermally stable synthetic fiber and oxidized polyacrylonitrile fiber, which may be used for manufacture of protective clothing for rescuers, servicemen, firemen, oil industry workers, and gas industry workers, filtering fabrics for cleaning of hot gases from toxic dust in metallurgical, cement and other branches of industry, decorative materials, thermally-resistant isolation, and toxic asbestos substitutes.
SUBSTANCE: method involves mixing non-oxidized polyacrylonitrile fiber with thermally stable synthetic fiber in the ratio of from 30/70 to 80/20, respectively; subjecting resulting mixture in the form of yarn, tape, fabric to thermally oxidizing processing at temperature of 240-310 C during 10-180 min.
EFFECT: elimination of problems connected with textile processing of frangible oxidized polyacrylonitrile fibers owing to employment of elastic polyacrylonitrile fibers rather than such oxidized fibers.
2 cl, 7 tbl, 6 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to technology of manufacturing thermoplastic monofilaments and can be used in fabrication of bristle used under high humidity conditions. Monofilament is composed of polymer blend constituted by at least one polyamide and at least one thermoplastic polyester. Ratio of constituents in the blend is selected according to technical and functional properties determined, on one hand, by destination of bristle and, on the other hand, by environmental conditions in the bristle application location. Polyamide fraction ranges from 10 to 30% and that of polyester from 70 to 90%. Bristle completely meets functional and technical requirements as well as environmental conditions.
EFFECT: reduced manufacturing cost.
FIELD: production of electric conducting pulp for manufacture of paper, reinforcing polymer materials and packaging films.
SUBSTANCE: pulp contains fibrous particles including 65-95 mass-% of para-amide and 5-35 mass-% of sulfonated polyaniline containing sulfur in the amount of 8.5-15 mass-% which is dispersed over entire para-amide partially covering the particles externally. Specific area of surface of fibrous particles exceeds 7.5 m2/g. Pulp may be mixed with 95 mass-% of pulp of other material including poly-n-phenylene terephthlamide. Paper made from this pulp reduces rate of electric charge lesser than 150 ml.
EFFECT: enhanced efficiency.
6 cl, 4 tbl, 1 ex
FIELD: processes for manufacture of synthetic threads, fibers and filaments from polyamide.
SUBSTANCE: method involves mixing melts of two compounds, namely, linear polyamide and polyamide including macromolecular star-like or H-like chains comprising one or more nuclei, and at least three polyamide side chains or segments, which are bound with nucleus and produced from amino acid and/or lactam monomers, or multifunctional compounds with three similar acidic or amine functional groups; forming resultant melt mixture into threads, fibers or filaments and drawing if necessary.
EFFECT: increased effectiveness of process for producing of threads, fibers and filaments and improved elongation properties.
22 cl, 4 tbl, 6 ex
FIELD: machine building.
SUBSTANCE: procedure consists in poly-condensation of three aromatic diamines with dianhydride of tetra-carbonic acid in a-proton polar solvent of equimolar amount. 2,5-bis(aminophenyl)pyrimidine, and paraphenylendiamine are used as diamines, while the third aromatic diamine is chosen from a row containing meta-phenylendiamine, 2,4-bis(aminophenyl)pyrimidine at their molar ratio 50:49:1 - 50:35:15 correspondingly.
EFFECT: fibres produced by wet moulding and subjected to fibre thermal cyclisation possess high durability and thermal resistance.
2 tbl, 8 ex