Asbestos-free polymer friction composition
SUBSTANCE: invention concerns asbestos-free polymer friction compositions and can be applied in production of brake shoes. Composition includes, wt %: linking agent out of high-molecular unsaturated hydrocarbon rubbers 19-24; mineral fillers of concentrated barite 18-25 and alumina 6-8; asbestos-free fibrous filler of kevlar pulp 1.5-3.0, arselon pulp 1.5-3.0, and wollastonite 2-5; carbon fillers of Carbon black 6.95-15.0, and graphite 24-30; curing group of sulphur 1-3, 2-mercaptobenzothiazol 0.5-0.9, and thiuram 0.03-0.15.
EFFECT: enhanced durability, friction rate stability of products manufactured on the basis of claimed composition, reduced product cost and emission of hazardous substances to environment.
The invention relates to polymeric compositions friction purposes and may be used in the manufacture of brake pads and linings of the brakes of vehicles and other mechanical objects.
The prior art composition for non-asbestos friction material containing rubber, vulcanizing the group on the basis of sulfur, a fibrous filler, a metallic filler, a friction modifier based on graphite, inorganic modifier is a mixture of barite concentrate and alumina. As the rubber used rubber SKD, as the fibrous filler is a mixture of polyoxadiazole fiber and mineral wool as metal-containing filler - roll iron stabbing, as a friction modifier, a mixture of graphite crystalline and cryptocrystalline graphite and carbon technical, and to the mixture of inorganic modifier added to the zeolite in the following ratio of the components of the composition, wt.%: Rubber SKD 18,00-22,00; Sulfur 1,50-2,50; 2-Mercaptobenzothiazoles 0,35-0,45; thiuram 0,10-0,30; Polyoxadiazole fiber 2,00-4,00; Mineral wool 18,00-22,00; the Fraction of iron split 4,00-6,00; Graphite crystal 2,00-3,00; cryptocrystalline Graphite 2,00-3,00; Carbon technical 6,00-8,00; Barite concentrate 27,00-28,00; Alumina 6,00-8,00; Zeolite 2,50-3,50 (R 2296778, 10.04.2007).
Known friction polymer composition, comprising a binder, a fibrous non-asbestos filler, inorganic modifier - barite, friction modifier - graphite and vulcanizing the group. As a binder taken rubbers from the group of high molecular weight unsaturated hydrocarbon rubbers: a mixture of CDS and SKI-3 with the addition of industrial oils And 20, as the fibrous filler used wollastonite, as a vulcanizing group contains sulfur, captax, thiuram, zinc oxide, further comprises carbon black and a binder modifier from the group of dibasic organic acids, including orthophthalic, isophthalic and terephthalic acid in the following ratio of the components of the composition, wt.%: binder from the group of unsaturated hydrocarbon rubbers: mix CDS, SKI-3, industrial oil And 20 10,0-13,0; non-asbestos Fibrous filler is wollastonite 50,0-55,0; Inorganic modifier-barite 19,0-25,0; Friction modifier - graphite 2,0-4,0; Carbon technical 1,5-1,9; Curing group: sulfur 3,0-4,0, captax of 0.2-0.5, thiuram 1,2-1,7, zinc oxide 0,3-0,7; Modifier binder from the group of the dibasic organic acid, orthophthalic, isophthalic and terephthalic acid is 0.1 to 5.0 (EN 2275394, 27.04.2006).
Closest to the proposed invention is a polymeric compositions the Oia friction destination containing butadiene rubber, vulcanizing group, powdered fillers, including barite concentrate, carbon black, filler based on aluminium oxide, crystalline graphite, cryptocrystalline graphite and fibrous reinforcing filler, which is used as a synthetic fiber, polyaramid threads, and the ratio of the powdery fillers for reinforcing fibrous filler is (12-50):1, in the following ratio of components in the composition, wt.%: Butadiene rubber 23-25; Vulcanizing group (sulfur and accelerators from the group thiazolo and Turnov) 3,05-3,45; Barite concentrate 8-11; carbon 19-21; Graphite crystal 9-11; cryptocrystalline Graphite 19-21; Filler based on aluminium oxide (aluminium oxide, alumina and kaolin) 9-11; Synthetic fibers, polyaramid threads (Arselon, servicecapture fiber (CBM), Kevlar, Twaron) of 1.5-5 (EN 2285704, 20.10.2006).
The disadvantage of these compositions is the fact that made on the basis of their products do not have a sufficiently high and stable coefficient of friction, have high wear resistance and high cost.
The challenge which seeks the proposed invention, is to establish a non-asbestos friction polymeric composition, which would exclude the above is not the leftovers.
Technical result achieved in the implementation of this invention is to improve durability made of her products, the stability of the coefficient of friction is made on the basis of products, reducing production costs and the emission of harmful substances into the environment during their manufacture.
This technical result is achieved in the non-asbestos friction polymeric composition containing as a binder from the group of high molecular weight unsaturated hydrocarbon rubbers, polybutadiene rubber, SKD, mineral fillers, including barite concentrate and alumina, non-asbestos fibrous filler containing Kevlar pulp, Arselon pulp and wollastonite, carbon fillers, including carbon technical and graphite, vulcanizing group containing sulfur, 2-mercaptobenzothiazoles and tioram in the following ratio, wt.%:
Use as a binder from the group of high molecular weight unsaturated hydrocarbon rubbers butadiene rubber SKD can significantly reduce the release of harmful substances into the atmosphere in the manufacture of products, to ensure the stability of frictional properties and wear resistance.
The use of wollastonite having a needle-like structure, as the fibrous filler, replacing the asbestos increases the durability of products, reduces the hazard in the manufacture of products and their subsequent operation.
The use of Kevlar pulp, Arselon pulp as a fibrous filler produced by the method of raspushenny cut Kevlar, Arselon fiber, replacing asbestos, ensures high thermal durability, stability, coefficient of friction, improve wear resistance.
C the show asbestos-free friction polymer composition is made by mixing all ingredients in mixer with Z-shaped rotors.
Examples of the claimed composition are presented in the table.
|Examples of the claimed composition|
|Name of the component||Content, wt.%|
|1. Rubber SKD||19,0||22,0||20,0||24,0|
|2. Mineral fillers|
|- Barite concentrate||25,0||20,0||25,0||18,0|
|3. Non-asbestos fibrous filler|
|- Kevlar pulp||1,5||2,0||2,2||3,0|
|- Arselon pulp||2,0||2,0||1,5||3,0|
|4. Carbon fillers|
|- Carbon technical||15,0||to 12.0||10,0||6,95|
|5. Curing group|
Thus, the use of the claimed composition can significantly improve physical and mechanical characteristics of the finished product, to make products with high strength characteristics, to ensure the stability of the coefficient of friction, improve wear resistance of the finished products, thereby increasing the reliability of friction products, as well as significantly reduce the release of harmful substances into the atmosphere during the production process and their subsequent operation.
Non-asbestos friction polymer composition, characterized in that it contains a binder from the group of high molecular weight unsaturated hydrocarbon rubbers, mineral fillers, including BA is Italy concentrate and alumina,
non-asbestos fibrous filler containing Kevlar pulp, Arselon pulp and wollastonite, carbon fillers, including carbon technical and graphite, vulcanizing group containing sulfur, 2-mercaptobenzothiazoles and tioram in the following ratio, wt.%:
|binder from the group of high-molecular|
|unsaturated hydrocarbon rubbers||19-24|
|carbon technical||6,95 to 15.0|
SUBSTANCE: invention concerns composite materials used in manufacturing of antifriction parts for friction units in automotive industry, e.g. of ball joint pads. Polymer material for "Lyugam" friction units contains, mass %: polyamide-6 34-70, high-pressure polyethylene 10-16, fiber carbon filler 12-35, and oil additive 7-15. The other is a composition based on a mineral oil, surfactants, functional additives and crushed crystal graphite.
EFFECT: improved performance characteristic of the material due to higher elasticity enabling better durability against impact loading, and to lower friction factor.
FIELD: polymer materials.
SUBSTANCE: invention relates to thermoplastic polymer composition, to products therefrom, and to use of hyper-branched (co)polymer. Composition contains matrix M including at least one thermoplastic(co)polymer and at least one additive, namely, functionalized hyper-branched (co)polymer, which is used as modifier of rheological properties. Functionalized hyper-branched (co)polymer is selected from group consisting of polyesters, polyester-amides, and polyamides. At least 50% of end groups of hyper-branched (co)polymer are functionalized by radical R2, which represents substituted or unsubstituted silicone-type hydrocarbon radical, linear or branched alkyl, aromatic, arylalkyl, alkylaryl, or cycloaliphatic radical optionally incorporating one or several unsaturated bonds and/or one or several heteroatoms. Composition is processed into products via molding, injection casting, injection casting with blowing, extrusion, and spinning.
EFFECT: improved rheological and mechanical properties of composition.
22 cl, 3 dwg, 9 tbl, 20 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to manufacture of polymer materials and, in particular, micro- and nanofibers showing elevated strength and durability, which can be employed in a variety of technical fields, including their use in various filters. Composition of fine fiber having diameters between 0,001 and 2 μm contains addition or condensation polymer and aromatic-nature resinous additive with molecular weight 500 to 3000, which additive may be disposed on the surface of fiber. Preparation method comprises exposure of polymer solution to electric field to form accelerated solution strands. Subsequent vaporization of solvent provides formation of fine fiber. Fibers are collected on a substrate and subjected to heat treatment at temperature not superior to melting point of polymer. From thus obtained fiber, fine-fiber material is manufactured.
EFFECT: manufacture of high-durability and high-strength fibers.
31 cl, 21 dwg, 5 tbl, 18 ex
FIELD: chemical industry; production of composite materials with the strengthening filler and the star-shaped polyamide as the thermoplastic die, the precursor of these materials and the products produced out of them.
SUBSTANCE: the invention is pertaining to the product being the precursor of the composite material including the thread and-or the fibers of the polymeric matrix made out of the thermoplastic polyamide and the strengthening thread and\or, the strengthening fibers, the part of which may be made out of the thermoplastic polyamide. At that the thermoplastic polyamide of the matrix and\or the strengthening threads or the fibers contains at least one star-shaped polyamide including the star-shaped macromolecular chains containing one or several nuclei and at least three polyamide branches or three polyamide segments linked with the nucleus. Using the thermal molding or mangling the product, may be during several stages they produce the composite material, the composite semi-product and the final composite product with high mechanical properties, which may be used in the field of aviation and sport.
EFFECT: the invention ensures production of the final composite product with high mechanical properties, which may be used in the field of aviation and sport.
24 cl, 4 tbl, 1 ex
FIELD: polymer materials.
SUBSTANCE: title polyamides possess also a good elongation capacity and a high thermo-mechanical strength. Object of invention is to obtain polyamides, which would be characterized by resistance to ageing under high working temperature conditions with their flexibility preserved. Disclosed composition contains (i) 60 to 99.5% (preferably 70-93%) of at least one copolyamide depicted by formula X/Y,Ar, wherein Y represents aliphatic diamine groups containing 8 to 20 carbon atoms; Ar represents groups of aromatic dicarboxylic acid; X either represents groups of aminoundecanoic acid H2N-(CH2)10-COOH, lactam-12 or corresponding acid or X represents unit Y.x, which is group resulting from condensation of diamine with aliphatic dicarboxylic acid (x) containing 8 to 20 carbon atoms, or X represents unit Y,I, which is group resulting from condensation of diamine with isophthalic acid; and (ii) 0.5 to 40% (preferably 7-30%) of at least one product selected from plasticizers, nano-fillers, polyolefins, cross-linked polyolefins, and additives. Preferably, X/Y,Ar represents: (1) 11/10,T resulting from condensation of aminoundecanoic acid, 1,10-decanediamine, and terephthalic acid, (2) 12/12,T resulting from condensation of lactam-12, 1,10-decanediamine, and terephthalic acid, (3) 10,10/10,T resulting from condensation of sebacic acid, 1,10-decanediamine, and terephthalic acid, or (4) 10,I/10,T resulting from condensation of isophthalic acid, 1,10-decanediamine, and terephthalic acid. Invention also provides apparatus, materials, and structures involving proposed composition.
EFFECT: improved performance characteristics of material.
27 cl, 4 tbl, 4 ex
SUBSTANCE: destruction of sulphur bridges and recovery of sulphur is ensured by bioprocessing of rubber particles in a medium containing mesophilous, anaerobic and/or mesophilous, optionally anaerobic and/or mesophilous microaerophilic bacteria and/or one or more enzyme system of the specified bacteria in environment appropriate for the specified bacteria living.
EFFECT: improved vulcanisation ability of processed rubber particles, and better quality of rubber products provided.
23 cl, 1 tbl
SUBSTANCE: invention relates to the method of modifying general- and special-purpose rubber mixes and rubbers built around high-molecular carbon-chain polymers. Modification of rubber mixes and rubbers is carried out with the help of low-molecular unsaturated polyketones incorporating carbonyl groups and double C=C bonds statistically distributed over the polymeric chain. Modification is effected by adding 0.5 to 50 wt % of low-molecular unsaturated polyketones to the rubber mix, the aforesaid percentage being related to the total content of high-molecular polymer and low-molecular unsaturated polyketone. Note that unsaturated polyketones used for modification contain 0.1 to 16 wt % of oxygen in the form of carbonyl groups and feature a number average molecular weight of 500 to 100000.
EFFECT: improved of technical characteristics of rubber mixes and increased strength characteristics of rubbers produced by vulcanisation of such rubber mixes.
7 cl, 11 tbl, 8 ex
FIELD: chemistry; transport.
SUBSTANCE: tire tread comprises of a cross-linked composition of natural rubber, which is characterised with hardness A by a scleroscope, more than 45 and less than 57, if measured in accordance with the Standard ASTM D 2240. And the tread is suitable for driving on ground with ice and snow and moist ground, improvement in wear resistance of tires and cohesion with moist ground. Composition contains, phr weight parts to one hundred parts of elastomer (elastomers): in quantity, which exceeds 25 phr and which go till 100 phr, one or a couple diene elastomers, each of which is characterised by temperature Tg in the diapason from -75°C to -40°C; at an amount less than 75 phr and till 0 phr, one or a couple diene elastomers, each of which is characterised with a temperature Tg in the diapason from -110°C till -75°C; in an amount in the diapason from 5 phr to 35 phr, at least one hydrocarbon plasticising resin, mixed with the mentioned elastomers (elastomer), from 5 phr to 35 phr, a natural plasticising bond of sunflower oil containing oleinic acid with a fraction of total mass not less than 60%.
EFFECT: improving wear resistance of tires and cohesion with moist ground.
33 cl, 3 tbl, 3 ex
SUBSTANCE: invention concerns rubber industry, particularly processing elastomer waste containing structured inclusions, obtained in synthetic rubber production, of production of homogeneous rubber mixes based on it. Rubber master batch is prepared with addition of fillers, softeners and other target additives. At the first stage master batch containing fillers or softeners is produced in rubber mixer or roller mill, cooled, and laid to rest for at least 6 hours. Obtained master batch passes on to second and third stages of rubber mix production on the basis of synthetic rubbers.
EFFECT: efficient use of elastomer bulk waste of synthetic carbon chain rubbers, improved environment protection due to waste processing, enhanced homogeneity, reduced cost of rubber mixes.
5 cl, 5 tbl, 3 ex
SUBSTANCE: invention concerns rubber compound and pneumatic tire, tread of which is made of this rubber compound. Rubber compound includes from 15 till 100 weight fractions of sol chain silicon dioxide, dispersed in isopropanol, possessing average aspect ratio L1/D between branched particles A-A, containing branched particles A in the range of from 3 till 30, from 1 till 20 weight fractions of silaned bonding agent for 100 weight fractions of rubber component, containing diene rubber, vulcanising agent, such as sulphur, and vulcanisation accelerator, where L1 corresponds average distance between branched particles A-A, containing branched particles A, and D corresponds effective diameter of primary particle. At that mentioned particle A corresponds particle, which is contacted at least by three other particles.
EFFECT: improvement of adhesion characteristic with wet and dry road surface at holding of rolling resistance characteristic.
3 cl, 2 dwg, 2 tbl, 2 ex
SUBSTANCE: invention refers to rubber-processing industry, in particular to development of thermoplastic elastomeric rubber materials that can be used for manufacturing of various extrusion profiles and moulded flexible parts for automotive, cable, light industry and construction engineering. Thermoplastic elastomeric material is made of composition including, wt. fraction: rubber - 100, polyolefin - 2-150, vulcanising agent 1-15, vulcanisation activator 3-10, stearic acid - 0.75-2.0, oil - 25-500 and bulk additive - 1-100, modified diene-containing thermoplastic elastomer, such as hydrooxylated, halogenated, hydrogenated or hydrohalogenated dienevinylaromatic thermoplastic elastomer - 5-150, release agent - zinc stearate, calcium stearate or their mixture - 0.1-2.0. As oil additive the material contains paraffine-naphthene oils, as bulk additive is contains powder filler with particle size 100 nanometers to 20 microns, selected from the group: schungite, kaolin, chalk, talcum powder or carbon white, as well as mixed mineral additive with 0.04-4.0 mass % of industrial carbon. Thus as rubber thermoplastic elastomeric material contains ethylene-propylene-diene rubber with propylene chains 27 to 40 mass %, and as the third comonomer is contains ethylidene norbornene or dicyclopentadiene in amount 2-10 mass %, as well as butyl rubber, chlorbutyl rubber, brominated butyl rubber, polyisoprene rubber, butadiene-styrene rubber, or polybutadiene rubber. As polyolefin it contains isotactic polypropylene, polyethylene or their mixture at ratio of polyethylene mixed with isotactic polypropylene in amount of 5-95 mass %.
EFFECT: production of material possessing high technological and physical-mechanical properties, melt processability to products without vulcanisation by moulding under pressure or extrusion, low density, high fullness by oil.
5 cl, 2 tbl
FIELD: inorganic chemistry.
SUBSTANCE: invention refers to tyre and rubber industry. Milled rubber scrap is mixed with hydrocarbon fraction and heat-treated at 150-250°C during 0.5-24 h. Fuel oil with initial boiling 350°C and aniline point 80°C and more is used as hydrocarbon fraction. Mixture ratio, mass.%: milled rubber scrap - 30-90, specified hydrocarbon fraction - 10-70. Technical result lies in widening of plasticizers raw materials base accompanying with low content of aromatic hydrocarbons and improvement of physical-mechanical properties of rubber compound based vulcanizers.
EFFECT: widening of plasticizers raw materials base accompanying with low content of aromatic hydrocarbons; improvement of physical-mechanical properties of rubber compound based vulcanizers.
2 tbl, 9 ex
FIELD: chemistry of polymers.
SUBSTANCE: invention relates to an elastomeric composition that can be used in making pneumotires or intermediate products for pneumotires. The composition is based on at least one diene elastomer, inorganic filling agent as an enhancing filling agent, polyfunctional organosilane, namely hydroxysilane of the general formula (I) given in the invention description as a binding agent (for system inorganic filling agent/diene elastomer) comprising at least two functional groups designated as "X" and "Y" that can be grafted to elastomer by one side using function X, and to inorganic filling agent by other side using function Y that represents hydroxysilyl function (≡Si-OH) and wherein organosilane is represented by hydroxysilane polysulfide of the general formula (I), and wherein the amount of inorganic enhancing filling agent is from 10 to 200wpe (weight parts per 100 weight parts of elastomer), and the amount of hydroxysilane polysulfide is in the range from 1 to 20wpe. Also, invention relates to a method for preparing the claimed elastomeric composition showing the improved kinetics of vulcanization by thermomechanical stirring components of the composition for one or two steps up to achievement of maximal temperature from 110 to 190°C. Also, invention relates to using this composition for manufacturing pneumotires or intermediate products designated for pneumotires, for example, protectors, sublayers, sides and so on, and to a pneumotire and an intermediate product for pneumotire containing such elastomeric composition, to a protector for pneumotire made of this composition and to pneumotire containing such protector. Also, invention relates to using a polyfunctional organosilane as a binding agent and to a method for binding inorganic and diene elastomer in an elastomeric composition by polyfunctional organosilane. The claimed elastomeric composition provides satisfactory reserve of safety with respect to the burning problem, it possesses a lower value of Mooney plasticity resulting to good ability for treatment in crude state and possesses the improved hysteresis properties and the improved the conversion constant rate and therefore vulcanization can be carried out for significant shorter time. Protectors made of the proposed composition possess low resistance to rolling motion and enhanced abrasion resistance.
EFFECT: improved and valuable properties of mixture.
32 cl, 2 tbl, 2 dwg
FIELD: transport engineering; tire industry; highly efficient tires.
SUBSTANCE: proposed tire for vehicle wheels includes carcass structure of toroidal shape whose opposite side edges are coupled by corresponding right-hand side and left-hand side bead wires to form corresponding beads; breaker structure applied in outer relative to radius position relative to said carcass structure: tread band radially applied to breaker structure; at least one layer of cross-linked elastomer material applied in inner relative to radius position relative to said tread band; pair of side strips applied from side to opposite sides relative to carcass structure; at least one layer of cross-linked elastomer material has following characteristics: dynamic modulus of elasticity E¹ measured at 70°C not lower than 20 MPa, preferably, from 25 MPa to 50 MPa; ratio between modulus of elasticity at extension at 100% elongation (MIOO) and modulus of elasticity at extension at 10% elongation (MIO) not lower than 1.5, preferably, from 2 to 5. One layer of cross-linked elastomer material is preferably laid between tread band and breaker structure. Invention provides better characteristics of tire during operation at high driving speed and/or extreme driving conditions - rigid steering, simultaneously with satisfactory behavior at normal driving conditions - soft steering.
EFFECT: improved service characteristics of tire.
50 cl, 4 ex, 5 tbl, 2 dwg
FIELD: rubber industry.
SUBSTANCE: invention is directed to preparation of rubber compounds based on general- and special-destination rubbers using naturally occurring wollastonite as filler and can be used in manufacture of technical-destination rubber goods, elastomeric compositions, polymeric rolled roofing and waterproof materials, and the like. Rubber compound is prepared by mixing general- or special-destination rubber, sulfur-containing vulcanization agent, extender: carbon black, zinc oxide, stearin. Functional additive is further added in the form of organosilane-modified wollastonite or wollastonite having needle structure with characteristic ratio from 10:1 to 20:1 and diameters of equivalent sphere D50=3-15 μm, D98=20-100 μm, D10=1-4 μm. Rubber compound may also contain 5 wt parts of paraffin-naphtene oil or 0.1 wt parts of stabilizer.
EFFECT: improved complex of technological and user's properties of rubber compound: strength, elasticity, and tear resistance.
14 tbl, 13 ex