Wholly aromatic couple-type sopoliamide drawn fiber and its manufacturing method

FIELD: chemistry.

SUBSTANCE: wholly aromatic couple-type sopoliamide drawn fiber has a tensile modulus of 630 cN/dtex or more, a dry heat creep 2.0×10-4 % or less after 10 hours at 80°C. Hot-stretch fiber is at high voltage and at a temperature in certain ranges of para-substituted aromatic sopoliamide fiber type.

EFFECT: creation of a wholly aromatic couple-type sopoliamide fiber having excellent tensile modulus.

8 cl, 2 tbl, 10 ex

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to field of processing synthetic fibres and deals with method of increasing physical and mechanical characteristics of aramide threads, containing 5(6)-amino-2(p-aminophenyl)-benzimidazole. It includes processing of threads from aromatic polyamides, containing 5(6)-amino-2(p-aminophenyl)-benzimidazole, in chamber of generator of ultrahigh frequencies by UHF-radiation. Heating of threads is performed under tension or in free state. After that, air-conditioning of threads is carried out.

EFFECT: improvement of physical and mechanical properties of threads from aromatic polyamides.

3 cl, 8 ex

FIELD: nanotechnology.

SUBSTANCE: invention relates to the technology of electroforming nanofibres with a diameter not exceeding 500 nm, and the processes occurring in forming nanofibres in the chamber of the forming device. The invention relates to preparing the forming solution to produce nanofibres from aliphatic copolyamides, and methods of modifying nanofibres through various compositions of forming solution. Improvement of consumer properties of products based on the nanofibres is connected with diameter of the nanofibres obtained and with the surface morphology, or the substantial reduction in defects both of nanofibres and the material produced from them. When using the material based on nanofibres from aliphatic copolyamides it is necessary to provide bio-inertness and nontoxicity when in contact with body tissues, and also the possibility of biodegrading and recycling.

EFFECT: invention provides production of fibres with improved physical-chemical properties, which, in turn, improves significantly the product quality.

32 cl, 18 dwg, 2 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method for reclamation of isobutyl alcohol in production of high-strength aramid fibres. The method includes neutralising starting solutions, rectification of a stretch bath solution in two columns, vacuum evaporation of a mixture of the still residue of a second column and the settling bath, rectification of the still residue of the vacuum evaporation apparatus, vacuum rectification of the evaporated product of the vacuum evaporation apparatus and a third column, rectification of the aqueous fraction to remove lutter water and rectification of the organic fraction to obtain the end product. Multicomponent starting mixtures containing 0-60% dimethyl acetamide (DMAA), 0-70% isobutyl alcohol, as well as lithium chloride (LiCl) or calcium chloride (CaCl2), hydrogen chloride, water and impurities making up the balance, are initially divided into mixtures containing lithium chloride or calcium chloride and mixtures not containing ether; the mixtures which do not contain lithium chloride or calcium chloride are divided into mixtures containing DMAA and mixtures which do not contain DMAA, and a liquid stream consisting of isobutyl alcohol and water and which does not contain DMAA, after cooling, is divided into two phases - an aqueous phase and an organic phase; the organic phase is fed for heteroazeotropic rectification, where water is separated at atmospheric pressure and anhydrous isobutyl alcohol is obtained.

EFFECT: method enables to obtain isobutyl alcohol of high quality.

1 dwg

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing aromatic copolyamides via low-temperature polycondensation of a mixture of aromatic diamines: 5(6)amino-2-(para-aminophenyl)benzimidazole and one or more diamines of formula (2) (as a version - together with a diamine of formula (1)) with haloanhydrides of aromatic diacids of formula (3) in the medium of an amide solvent with a salt additive. Also disclosed is wet or dry-and-wet moulding of fibres from the disclosed polycondensation solutions. NH2-Ar1-NH2 (1), NH2-Ar2-NH2 (2), ClOC-Ar1-COCl (3) Ar1 and Ar2 are divalent para-aromatic radicals: Ar1= , where X=H, Alk, AlkO, Hal, wherein Alk, AlkO are lower C1-C4 alkyl radicals; Hal is mainly Cl; Ar2 is a complex aromatic group and (or) , where X=X1=Cl; X=Cl, X1=H. The obtained fibres have linear density in the range of 25-65 tex, strength of 200 cN/tex or higher, tangent modulus of elasticity of 140 GPa or higher and elongation of 1.5% or higher.

EFFECT: high linear density, strength and tangent modulus of elasticity of the fibres.

5 cl, 1 tbl, 15 ex

FIELD: textiles, paper.

SUBSTANCE: hollow fiber comprises a polymer derived from a polyimide precursor, moulded from a spin dope containing polyamine acid, and the hollow fiber has a cavity located in the center of the hollow fiber; macropores located around the cavity, and the mesopores and pikopores located around macropores where the pikopores are three-dimensionally interconnected to form a three-dimensional network structure. Polyamine acid contains a repeating unit derived from an aromatic diamine, comprising at least one functional group, which is in the ortho position with respect to the amino group and the dianhydride.

EFFECT: obtaining of hollow fiber with high permeability and good selectivity for the manufacture of membranes for gas separation.

44 cl, 1 tbl, 8 dwg, 17 ex

FIELD: chemistry.

SUBSTANCE: yarn is made from a copolymer obtained from a mixture of monomers. The yarn contains 5-(6)-amino-2-(para-aminophenyl)benzimidazole, aromatic para-diamine and aromatic para-diacid, wherein the yarn is heated in at least two steps. At the first step, the yarn is heated at temperature 200-360°C with tension of at least 0.2 cN/dtex and at the second step, the yarn is heated at temperature 370-500°C with tension less than 1 cN/dtex. The multi-filament aramid yarn, which is spun from a sulphate spinning solution, has breaking strength of at least 250 mN/tex.

EFFECT: invention enables to produce high-strength aramid yarn.

11 cl, 7 tbl, 8 ex

FIELD: chemistry.

SUBSTANCE: solution with 15-30 wt % concentration of polyhexamethylene adipine amide and polyhexamethylene sebacinamide copolymer with ratio 60:40 wt % in an alcohol-water mixture with 45-97 vol. % ethanol content is obtained. The solution is filtered and deaerated. The solution is fed through a die hole-electrode in an electric field with strength E=1.5 104-4.0 105 V/m and distance between electrodes of 0.1-0.5 m. Nanofibres are deposited on an oppositely charged electrode with diameter d=50-4500 nm. The fibres form material having high porosity, vapour- and water-permeability, high hydrophilic behaviour and bioinertness.

EFFECT: obtained material can be used to make wound covers, filters for cleaning liquid and gaseous media, matrices for proliferation of stem cells.

11 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to production of cross-linkable aramide copolymer compositions and articles made therefrom. The composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link and at least one hydroxyarylene link. Alternatively, the composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link or at least one hydroxyarylene link and a covalent cross-linking agent. The invention also relates to cross-linked copolymers obtained from said composition and moulded articles containing such cross-linked copolymers.

EFFECT: invention enables to obtain materials with improved operational properties.

15 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: present invention pertains to versions of polyamide resin in form of granules, to composition of polyamide resin, moulded objects, versions of articulated moulded objects, binding band, and unit thread. In the first version, polyamide resin contains components of dicarboxylic acid o links, containing adipinic acid links, and components of diamine links, containing pentamethylenediamine links and hexamethylenediamine links. Mass ratio the number of pentamethylenediamine links to the number of hexamethylenediamine links lies between 95:5 and 5:95. Pentamethylenediamine links are formed from pentamethylenediamine, obtained from lysine using lysine decarboxylase, capable of producing lysine decarboxylase cells, or a product of converting such cells. In the second version, polyamide resin contains components of diamine links, with mass ratio of the number of pentamethylenediamine links to the number of hexamethylenediamine links lying between 95:5 and 60:40. The polyamide resin composition essentially consists of the above mentioned polyamide resin and inorganic filling material. Content of inorganic filling material ranges from 0.01 to 150 mass units, per 100 mass units of polyamide resin. From polyamide resin or composition of polyamide resin, a moulded object is obtained using vibration welding, or an articulated object, or a binding band, or a unit thread. The articulated moulded object can also be made from polyamide resin, consisting of adipinic acid links and pentamethylenediamine links.

EFFECT: obtaining a polyamide resin with high thermal stability, a moulded object, with high vibration welding strength, an articulated moulded object and a binding bans, with good low-temperature strength, a unit thread, with good transparency.

20 cl, 6 tbl, 6 ex, 8 dwg

The invention relates to the technology of poly-n-phenyleneterephthalamide (PPTA) - aromatic polyamide and copolymers used in the manufacture of high strength, high modulus fibers

FIELD: chemistry.

SUBSTANCE: invention relates to method of obtaining aromatic polyamidines, which can be used for obtaining heat-resistant film light-sensitive and luminescent materials. Method of obtaining polyamidines consists in realisation of polycondensation of 4,4'-dicarboxamidodiphenyloxide with aromatic diamines in mixture CH3SO3H:P2O5 (8-10:1 wt.), at 100-120°C, for 4-6 hours.

EFFECT: invention makes it possible to perform synthesis in milder conditions on the basis of stable and available monomers, and increase molecular weight of polymers.

5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to aramid polymers and products obtained therefrom. Disclosed is a cross-linked aramid polymer which includes a first aramid backbone chain which is cross-linked at the amide group through poly(meth)acrylic acid with an amide group of a second aramid backbone chain, and in which the aramid backbone chains are not modified by inclusion of monomers to obtain cross-linkable copolymers. Disclosed also is a method of producing the disclosed polymer and article from the disclosed polymer.

EFFECT: disclosed polymer enables to obtain highly oriented fibres with improved physical and mechanical properties.

11 cl, 2 tbl, 1 ex

FIELD: chemistry.

SUBSTANCE: invention relates to methods of producing a composition in form of crumbs, containing an aromatic polyamide from an aromatic diamine and an acyl chloride of an aromatic dicarboxylic acid. Disclosed is a method of producing crumbs of an aromatic polyamide from an aromatic diamine and an acyl chloride of an aromatic dicarboxylic acid, where the aromatic polyamide includes elementary units of 5(6)-amino-2-(p-aminophenyl)benzimidazole-terephthalamide and has relative viscosity ηrel of at least 3, by adding monomers (i)-(iii) to N-methylpyrrolidone as a solvent, where: (i) is paraphenylenediamine (PPD) with concentration of 0-30 mol %; (ii) is 5(6)-amino-2-(p-aminophenyl)benzimidazole (DABPI) with concentration of 20-50 mol %; (iii) is terephthaloyl dichloride (TDC) with concentration of 49.05-50.05 mol %; and optionally calcium chloride to obtain molar ratio CaCl2/aromatic diamine less than 0.5, and ratio aromatic diamine/acyl chloride of aromatic dicarboxylic acid from 0.99 to 1.01; mixing monomers and optionally calcium chloride into a homogeneous mixture having monomer concentration from 5 to 12 wt %, and then adding calcium chloride to the homogeneous mixture to obtain molar ratio CaCl2/aromatic diamine of 0.6-1.0; and polymerising the mixture.

EFFECT: obtaining a polyamide in form of crumbs in a large-tonnage industrial process.

7 cl, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: method of production involves synthesis of a copolyamide by low-temperature copolycondensation of a mixture of 5(6)-amino-2(4-aminophenyl)benzimidazole, para-phenylenediamine and terephthaloyl chloride in an amide solvent solution with addition of 2.5-4.5 wt % LiCl or CaCl2, moulding the obtained polycondensation solution, washing, drying, heat-treating and hot-stretching the obtained fibre. In one version, synthesis is carried out with addition into the reaction mass of a viscosity stabiliser in amount of 4-25 mol % of the mixture of diamines and excess terephthaloyl chloride in amount of 0.15-1.2 mol % of the mixture of diamines. In another version, the viscosity stabiliser is added in amount of 4-7.5 mol % of the mixture of diamines, and at the end of synthesis, terephthalic acid is added in amount of 0.15-1.2 mol % of the mixture of diamines and stirred until complete dissolution, and copolymer terminal groups are converted during heat treatment in an inert medium at temperature of 340-360°C. The result is obtaining an aramid fibre which is characterised by ultimate strength of 260 gf/tex or higher, initial modulus of elasticity of 16000 kgf/mm2 or higher, wherein the increase factor of strength of the fibre in microplastic is 1.6 or higher, and breaking stress is 620 kgf/mm2 or higher.

EFFECT: high ultimate strength and elasticity of the fibre.

10 cl, 1 tbl, 11 ex

FIELD: nanotechnology.

SUBSTANCE: invention relates to a method of obtaining a nanocomposite material for thermal and chemoresistant coatings and planar layers with high dielectric capacitivity. The method is proposed in which, as the polymer binder the poly (o-hydroxy amide) is used - a product of polycondensation of 3,3'-dihydroxy-4,4'-diamino-diphenylmethane and isophthalic acid dichloride in amide solvent, and as a filler the ferroelectric material nanopowder CTSNV-1 Pb0.81 Sr0.04Na0.075Bi0.075(Zr0.58Ti0.42)O3 at a weight ratio of poly(o-hydroxy amide): filler from 1:1.15 to 1:1.5. The ratio of components in the nanocomposite (wt %): poly(o-hydroxy amide) 6-12; filler CTSNV-1-6.9-18, solvent - the rest. Mixing of the components is carried out at room temperature without preliminary dispersion of ferroelectric filler, before applying to the conductive substrate the nanocomposite suspension is subjected to ultrasonic treatment. Films formed on the conductive surfaces are dried at 95-100°C and subsequent stepped heat processing in the temperature range of 200-350°C.

EFFECT: obtained coatings are chemically stable, have a heat resistance up to 400°C, high adhesive capacity to various types of substrates and dielectric capacitivity ε of 23 to 185.

1 cl, 1 tbl, 9 ex

FIELD: chemistry.

SUBSTANCE: disclosed is a method of producing aromatic copolyamides via low-temperature polycondensation of a mixture of aromatic diamines: 5(6)amino-2-(para-aminophenyl)benzimidazole and one or more diamines of formula (2) (as a version - together with a diamine of formula (1)) with haloanhydrides of aromatic diacids of formula (3) in the medium of an amide solvent with a salt additive. Also disclosed is wet or dry-and-wet moulding of fibres from the disclosed polycondensation solutions. NH2-Ar1-NH2 (1), NH2-Ar2-NH2 (2), ClOC-Ar1-COCl (3) Ar1 and Ar2 are divalent para-aromatic radicals: Ar1= , where X=H, Alk, AlkO, Hal, wherein Alk, AlkO are lower C1-C4 alkyl radicals; Hal is mainly Cl; Ar2 is a complex aromatic group and (or) , where X=X1=Cl; X=Cl, X1=H. The obtained fibres have linear density in the range of 25-65 tex, strength of 200 cN/tex or higher, tangent modulus of elasticity of 140 GPa or higher and elongation of 1.5% or higher.

EFFECT: high linear density, strength and tangent modulus of elasticity of the fibres.

5 cl, 1 tbl, 15 ex

FIELD: chemistry.

SUBSTANCE: aromatic polyamide fibres, containing a heterocycle-containing aromatic polyamide, undergoes thermal treatment in conditions with oxygen content of 1 vol. % or less after stretching. The aromatic polyamide fibres are characterised by tensile strength of 20 cN/dtex or higher, initial modulus of 500 cN/dtex or higher, and the amount of substance dissolved in sulphuric acid equal to or less than 45%.

EFFECT: disclosed heterocycle-containing aromatic polyamide fibres demonstrate an excellent balance between tensile strength, initial modulus and strength in a direction perpendicular the axis of the fibre, are characterised by high strength retention coefficient under heat and moisture conditions and excellent fire-resistance, bullet-proof properties and cutting resistance.

11 cl, 1 tbl, 12 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to production of cross-linkable aramide copolymer compositions and articles made therefrom. The composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link and at least one hydroxyarylene link. Alternatively, the composition contains an aramide copolymer obtained from monomers containing 1,4-phenylenediamine and tetraphthaloyl dichloride, and having at least one arylene-carboxylic acid link or at least one hydroxyarylene link and a covalent cross-linking agent. The invention also relates to cross-linked copolymers obtained from said composition and moulded articles containing such cross-linked copolymers.

EFFECT: invention enables to obtain materials with improved operational properties.

15 cl, 9 ex

FIELD: chemistry.

SUBSTANCE: method of producing heat-resistant material for protective coating involves dissolving a polymeric binder in a solevent, where the binder is in form of poly(o-hydroxyamide), which is a product of polycondensation of dichloride of isophthalic acid with 3,3'-dihydroxy-4,4'-diaminodiphenylmethane in a solvent in molar ratio of reagents ranging from 1:1:7 to 1.05:1:15, and mixing with carbon nanofibres or carbon nanoclusters, obtained through hydrolysis of methane on a Ni/MgO catalyst with length of fibres from 50 to 100 mcm and diametre from 20 to 60 nm until obtaining a homogeneous composition.

EFFECT: obtained finished material is heat-resistant, is highly adhesive and has protective properties when deposited on surfaces of varying chemical nature.

3 cl, 5 ex

FIELD: chemistry.

SUBSTANCE: invention relates to the method of obtaining aromatic polyamide, to aromatic polyamide, containing a link of para - phenyleneterephtalamide and 2-(p-phenylene)benzimidazoleterephtalamide, as well as to the method of obtaining pure aromatic polyamide, suitable for production of spinning solution, used for making fibres and films. The method of producing aromatic polyamide involves copolymerisation of the following components: i) a mol % para-phenylendiamine, ii) b mol % 5(6)-amino-2-(p-aminophenyl)benzimidazole and iii) 90-110 mol % terephthaloylchloride, in a mixture of N-methylpyrrolidone. The N-methylpyrrolidone mixture contains c wt % calcium chloride, where c lies between 1 and 20. The ratio a:b varies from 1:20 to 20:1, a+b=100 mol %. i), ii) and iii) together constitute 1-20 wt % of the mixture. Product of b and c is at least 50 times less than 215. The obtained aromatic polyamide is a powder with relative viscosity ηrel which is at least 4. Powder is defined as non-sticky particles, at least 95% of which have average diametre 0.7-15 mm. The method of producing purified aromatic polyamide involves coagulation of aromatic polyamide, washing the powder in water and drying.

EFFECT: invention allows for obtaining aromatic polyamide with high relative viscosity in form of powder, which can easily be coagulated, washed and dried.

4 cl, 1 tbl

FIELD: polymer production.

SUBSTANCE: invention relates to polyamides that can be used in a variety of arias as high-strength and high-temperature-resistant coatings, plastic binders, glass plastics, and films. Two-stage production process comprises preparation of polyimidates via non-equilibrium polycondensation of bis-phenols with N-phenylimine chloride based on mono- and dicarboxylic acids, after which resulting polyimidates are subjected to Chapman rearrangement at 240-260оС for 5-6 h.

EFFECT: enabled production of polymers showing good solubility and elevated treatment resistance.

2 tbl, 12 ex

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