Protective material and protective products of such material

FIELD: textile, paper.

SUBSTANCE: protective material for work in the conditions of external influences, such as electromagnetic field radio frequency bands, electric field of industrial frequency, and switching and stepping voltage and/or electric arc, is made of conductive fabric composed of filaments on the basis of meta-aramid fibers based on poly m-phenylene isophthalamide and/or its derivatives and a stainless metal staple and/or monofilament fibers in a ratio of 70:30 to 30:70 pts. wt. respectively, with a density of 250 to 400 g/m2 and heat resistance at not less than 13 cal/cm2 minimum density. Stainless metal fiber for providing corrosive resistance is made of stainless iron-based steel alloy with an additive selected from a number of chromium, nickel, titanium, carbon, manganese, copper, boron, vanadium, niobium, aluminum, tungsten, molybdenum. The fabric is adapted to coloring by using an appropriate hue aramid fiber and a linen weaving (1/1) or broken twill (2/1 or 3/1) are usually used. The protective product is made in the form of a garment, or hat, or hood, or helmet, or screened helmet, or shoes, or protective cover, or shoe covers, or gloves, or mittens, or socks.

EFFECT: invention allows for the possibility of wet washing without loss of protective properties and protect against electrical and thermal injuries when hitting an electric arc in a person.

8 cl, 1 dwg



Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of producing synthetic fibres with high chemical resistance and water-repellent properties and low coefficient of friction, and can be used in chemical industry. The fibre is a polymer matrix whose surface is coated with a layer of polytetrafluoroethylene with thickness of 0.5-6 mcm. The polymer matrix is made of different thermoplastic polymers.

EFFECT: high strength, water-repellent properties and deformation resistance of the fibres and low cost thereof.

2 cl, 3 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: polymer composition contains a first basic polymer (A) containing at least a thermoplastic polymer; a second basic polymer (B) containing at least a thermoplastic polymer and which is incompatible with the first basic polymer (A); and an additive (C) containing at least a substance which is incompatible with any of the first basic polymer (A) and the second basic polymer (B). The additive (C) is a liquid or suspension at temperature lower than the pyrolysis temperature of the first basic polymer (A) and the pyrolysis temperature of the second basic polymer (B). Components (A), (B) and (C) are separated from each other by a phase, and boundary surfaces, each lying between two phases (A), (B) and (C), are in contact with each other, forming spatially continuous parallel boundary surfaces. A moulded product, for example, is a filter or a spacer for refrigerators or capacitors. The polymer composition is used to produce an adhesive, ink, paint, films and fibre for a powdered catalyst.

EFFECT: polymer composition and products therefrom quasi-stably contain a large amount of substance which is incompatible with a polymer matrix, therefore suitable for obtaining moulded articles and other products having various properties.

25 cl, 10 ex

FIELD: chemistry.

SUBSTANCE: mixture of polypropylenes basically contains a first homopolypropylene and a second homopolypropylene. MFR of the first homopolypropylene is higher than that of the second homopolypropylene. The weight fraction of the second homopolypropylene in the mixture of polypropylenes ranges from at least 3 wt % to a maximum of 25 wt %, wherein the remaining portion of the mixture of polypropylenes is basically composed of the first homopolypropylene. The second homopolypropylene has MFR, according to ISO 1133, from 0.7 to 14 g/10 min (230C/2.16 kg). The difference between the MFR of the second homopolypropylene and the MFR of the first homopolypropylene is at least 10 g/10 min, and the upper limit of the MFR of the first homopolypropylene is 55 g/10 min (230C/2.16 kg), according to ISO 1133. The mixture 'basically' contains only these two homopolypropylenes as polymers. The mixture can be added to a dopant or other additives except polymers. The mixture is obtained by separately feeding the first and second homopolypropylenes into an extruder.

EFFECT: invention enables to obtain high-expandability spunbonded nonwoven material from the corresponding mixture of polypropylenes.

26 cl, 4 dwg, 9 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to pre-stretched multilayer films, fixers, webs, etc. Proposed article comprises at least two layers, one low-crystalline and one high-crystalline layers. Low-crystalline layer comprises low-crystalline olefin (co)polymer while high-crystalline layer comprises high-crystalline olefin (co)polymer with melting point below that of low-crystalline olefin (co)polymer. Difference between crystallinity of both (co)polymers makes at least 1 wt%. Article allows elongation at temperature below low-crystalline polymer melting point in at least one direction to elongation degree making at least 50% of its initial length or width. Preferably, high-crystalline layer should be subjected to plastic deformation after elongation.

EFFECT: pre-stretched multilayer articles.

49 cl, 4 dwg, 3 tbl

FIELD: construction.

SUBSTANCE: fibre has an average diameter from 0.15 to 2.0 mm, is double-component of core/shell type and is made of polyolefines or other thermoplastic polymers. The fibre is produced by coextrusion with drawing ratio from 5 to 15. On completion of drawing the fibre has surface, which is structured or corrugated continuously or with intervals. Depth of structuring makes more than 10% of the average fibre diameter, and the maximum distance between tops in the formed structure in axial direction makes from 0.5 mm to 3 mm. Such fibres are applied to increase rupture strength, to improve behaviour after fracture or in general for mechanical strengthening of cement-based construction materials, in particular, concrete.

EFFECT: bundles with synthetic film may be introduced into a construction material without defects.

10 cl, 9 dwg

FIELD: medicine.

SUBSTANCE: present invention refers to medicine, more specifically to a multi-component superabsorbent fibre which includes a first superabsorbent material and a second superabsorbent material. At least on a portion of a lengthwise (L) direction of the superabsorbent fibre, the first superabsorbent material and the second superabsorbent material are parallel in a crosswise (C) direction of the superabsorbent fibre. The first and second superabsorbent materials are selected so that in the given point during swelling, the swelling capacity (SC) of the first superabsorbent material exceeds the swelling capacity of the second superabsorbent material so that the superabsorbent fibre (10) curls in contact with fluid. Also, the invention refers to a method of reduced gel blockage in the superabsorbent fibre.

EFFECT: in contact with fluid, the fibres provided an open structure which reduces gel blockage.

10 cl, 6 dwg, 2 ex

FIELD: chemistry.

SUBSTANCE: method of producing threads involves preparation of a chitosan solution, drawing viscose or caprone threads through said solution and drying. The chitosan is preliminarily swollen in water. Concentrated acetic acid is added while stirring in an amount equal to content of chitosan. Further, 10-40 vol. % ethyl alcohol is added to the obtained solution and then held for 222 hours at 222C until complete maturation.

EFFECT: invention intensifies the dissolution process and shortens duration of stirring the mixture from 6-8 hours to 2-3 hours, reduces viscosity, accelerates the solvent evaporation process by 1,5 times, increases stability of formation and prevents sticking of threads and formation of defects.

4 ex

FIELD: chemistry.

SUBSTANCE: invention relates to technology of producing synthetic fibre which can be used for three-dimensional reinforcement of cement products. The fibre is made in form of coaxial core and cladding. The core contains a thermoplastic polymer. The cladding contains either a thermoplastic polymer which is resistant to medium at pH>11 and one or more hydrophilic and/or surface active substances in amount of 3-30% of the total weight of the cladding, or the cladding contains a thermoplastic polymer which is resistant to medium at pH>11, engrafted with active or unsaturated monomers which make up 3-25% of the total weight of the cladding. In both cases, surface tension of the cladding is not less than 45 mN/m. The method making the cladding involves extrusion of molten mass of the basic component of the cladding and the basic component of the core through a concentric draw plate, where during extrusion, hydrophilic and/or surface active substance is added to the molten mass of the cladding. The cement product is obtained from a concrete mixture, mortar or cement paste in which the said fibre is dispersed.

EFFECT: invention enables to obtain fibre with a uniformly hydrophilic surface and high surface tension, good strength properties, which has an effect on strength and longevity of reinforced cement products.

27 cl, 3 tbl, 6 ex

FIELD: process of production of synthesized textile fiber containing phytoprotein, applicable in the textile industry.

SUBSTANCE: the fiber contains exactly or less than 94 parts of the total percentage of materials of polyvinyl alcohol and exactly or more than 21 parts of phytoprotein. The method for fiber production consists in production of a spinning solution of polyvinyl alcohol containing phytoprotein, precipitation in a coagulation bath, drafting, thermofixation, finishing and acetalization.

EFFECT: produced phytoprotein synthesized fiber with a maximum air permeability and possessing properties similar to those of cashmere, reduced duration of the production cycle and enhanced output.

18 cl, 13 ex

The invention relates to the field of production of monofilaments with reduced secondary forces of adhesion and products of such monofilament

FIELD: process engineering.

SUBSTANCE: invention relates to composites with high mechanical strength to prevent damages caused by striking, particularly, to production of laminates. Prepreg includes a structural layer of conducting fibres containing thermosetting resin fitted in gaps. First outer resin layer contains thermosetting resin and combination of electrically conducting free single threads. The latter are arranged on the surface of interface between said structural layer and resin outer layer. The latter hardening at increased temperature brings about hardened composite. The latter comprises hardened structural layer of compacted conducting fibres and first outer layer of hardened resin. Note here that said outer layer of hardened resin includes a portion of said combination of electrically conducting free single threads dispersed therein. Note here that said combination of electrically conducting free single threads is made of the portion of structural layer of conducting fibres.

EFFECT: light composite of excellent mechanical properties.

16 cl, 11 dwg, 2 tbl, 2 ex

FIELD: machine building.

SUBSTANCE: invention relates to devices and method of the vibration protection of vehicles, in particular to shock-absorbing gaskets under bases of rails or bars of the pointworks, as well as for vibration protection of the construction structures and industrial equipment. Method of shock-absorber stiffness regulation includes addition of the synthetic polypropylene fibre from 0.1 to 12 wt % to wet porous rubber mixture based on unsaturated rubber or mixture of rubbers, as calculated to weight of the rubber mixture with further creation and vulcanisation of the produced products. At that amount of the polypropylene fibre is calculated as per the preliminary obtained by tests relationship between the shock-absorber stiffness and content of fibre within the specified range and ensuring the required stiffness.

EFFECT: method produces the porous shock-absorber with set Young's modulus characterised, in principle, by the linear relationship of the Young's modulus and content of the specified polypropylene fibre.

18 cl, 1 dwg, 8 tbl

Friction drive belt // 2551693

FIELD: machine building.

SUBSTANCE: invention relates to machine building and can be used in transmission gears. A belt for friction gears (10) comprises a glue part (12) of rubber and a compressive part (14) of rubber which is set lower than the glue rubber part (12). A cord (11) being an element for belt tension, is built-in in the glue rubber part (12). The glue rubber part (12) is fitted by an upper layer (12A) making up the upper side, and by a lower layer (12B) making up the lower side which is located around the cord (11). The upper layer (12A) and the lower layer (12B) are produced at the vulcanization of rubber mix containing high-viscous elastomer, for example, EPM or EPDM, and low-viscous elastomer with the Mooney viscosity of the latter being less than that of the high-viscous elastomer, and containing modified polyamide microfibers in the capacity of short fibres (21A, 21B) respectively. The short fibres (21A, 21B) are oriented in the width direction and longitudinal direction of the belt respectively.

EFFECT: better durability of a belt.

15 cl, 3 dwg, 3 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to moulded composites used for production of cases of electronic hardware, particularly, to moulded product made of composite with reinforcing fibres. It comprises reinforced composite including continuous reinforcing fibres isotropic in the plate and 2D-directed in thermoplastic resin. Reinforcing fibres in moulded product comprises the bundle of said fibres composed by limiting number of single fibres defined by mathematical relationship. Bundle of reinforcing fibres relates to total amount of reinforcing fibres in moulded product as 20% by volume or more and smaller than 90% by volume. Mean number of reinforcing fibres in said bundle is also defined by mathematical formula.

EFFECT: light, thin-wall moulded product of high stiffness and complex 3D shape.

14 cl, 5 dwg, 3 ex

FIELD: process engineering.

SUBSTANCE: invention relates to perfected composites reinforced with fibres. This material is composed of reinforcing fibres with mean fibre length of 5-100 mm and thermoplastic resin, viscoelastic properties of this material being defined by mathematical formula.

EFFECT: thin-wall composite reinforced with fibres, high mechanical properties, possibility of production of isotropic moulded product.

6 cl, 6 dwg

Composite material // 2550200

FIELD: chemistry.

SUBSTANCE: invention relates to thermoplastic-based composite materials for components which require impact strength, as well as to sandwich-type materials using composite material as the core and to a composite material. The composite material contains an organic thread having a melting point of 200C or higher and a thermoplastic resin. The organic thread is in the form of a cord made of twisted yarn or fabric or knitted material which consists of a cord made of twisted yarn.

EFFECT: invention enables to produce composite material having high impact strength, high modulus of elasticity and excellent lightness, output and processability.

14 cl, 18 tbl, 3 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of prepreg and prepreg-based materials. Proposed process comprises the feed of unilateral conducting fibres of definite width and bringing them in contact with resin first ply first surface including the thermosetting resin. Resin and fibres are compacting by forcing them under one or several impregnating rollers. Note here that pressure acting at conducting fibres and resin does not exceed 40 kg per conducting fibre width centimetre. The amount of resin should be sufficient for penetration in between fibres and for making of resin outer ply. The latter, in fact, does not contain unilateral conducting fibres. Besides, this invention relates to solidified composite laminate and solidified composite prepreg-based sheets produced as indicated above.

EFFECT: better resistance of breakage caused by thunderbolts.

17 cl, 5 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to a method of obtaining a binder, used for soaking mineral fibres, in particular glass and basalt fibres, applied in the field of insulation materials. The method of obtaining the polymer binder for soaking fibres contains the following stages: {a} obtaining partially acetalated polyhydroxypolymer, preferably polyvinyl alcohol, preferably with the acetalation degree of 18-22%, with aldehyde, in the presence of an acetalation catalyst, preferably inorganic acid, {b} obtaining a triple copolymer of (b1) vinylaromatic monomer, (b2) compound, containing a carboxyl group, (b3) acryl compound, selected from the group, consisting of isobutylacrylate, isopentylacrylate, pentylacrylate, N-isopropylacrylamide and butylacrylate, taken in a specified molar ratio until viscosity of at least 50 sec, measured by a cup viscosimeter with a nozzle diameter of 8 mm, in accordance with ISO 2431/ASTM D5125, {c} obtaining a copolymer of acrylic acid and acrylnitrile, {d} with the following compound, with mixing, of specified quantities of earlier obtained polymers, with the optional addition of additives into the formed in the said way mixture with further mixing for 30 minutes, the resulting hardening binder represents a water solution and has the colour from reddish-yellowish to reddish-brown and pH in the range of 5-7. The invention relates to the hardening binder, its application, and to the bound fibres.

EFFECT: products from fibreglass, soaked with the binder in accordance with the invention, have after ageing good size stability both in the longitudinal and in the transverse direction, as well as are characterised by good tensile strength stability.

7 cl, 1 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to field of obtaining prepregs for creation of composite materials based on continuous highly strong high modulus polyethylene fibres from ultrahigh molecular polyethylene, which can be used in different fields of technology, for instance in helicopter building, aviation, automobile building and ship building. Method of obtaining prepreg for composite materials includes processing multifilament ultrahigh molecular fibre or based on it fabric with fluorine-helium mixture under pressure 0.01-0.1 MPa, duration of processing is 1-60 min, temperature of processing is 20-40C, with further impregnation with polymer binding agents based on epoxy resin. Multifilament ultrahigh molecular polyethylene fibre or based on it fabric undergoes degassing under lower pressure before being processed with fluorine-helium mixture.

EFFECT: invention makes it possible to obtain from prepreg high-quality ultralight highly strong high modulus composite materials, exceeding materials from non-processed fibre in specific properties.

2 cl, 5 tbl, 4 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of drive belts with resilient cord embedded in elastomer substrate including polyurea-urethanes glue composition impregnating said cord and covering fibres. Composition is composed of the product of reaction of polyurethane prepolymer and diamines hardener or water. Said prepolymer represents the product of reaction of diisocyanate with compact symmetric molecules and complex polyetherpolyol, simple polyetherpolyol or polyol polycarbonate. Belt substrate can be made of moulded polyurethane, rubber or thermoplastic elastomer. Said cord can include adhesive coating.

EFFECT: perfected design.

25 cl, 7 tbl, 4 dwg, 20 ex

FIELD: inorganic chemistry, in particular low density materials useful in form of molding article as sealing or insulating materials.

SUBSTANCE: claimed method includes blending of aluminum silicate hole beads with powder of epoxy or polyester resin in ratio of (2/3-1/3) pts vol. of aluminum silicate to (1/3-2/3) pts vol. of resin. Mixture is formed and heat treated at 200°C for 0.5-1.5 h. Powder of epoxy or polyester resin represents waste from powder coating or hot-drying varnishing and has particle size of 30 mum or less. Aluminum silicate hole beads have diameter of 10-100 mum. Obtained articles have bulk mass of 0.4-0.5 kg/dm3 and compression strength of 10-20 N/cm2.

EFFECT: thermoreactive material with low bulk mass and good compression strength.

7 cl, 6 dwg