Composite material for tribological coatings
The invention relates to polymeric materials and can be used in mechanical engineering for production of tribological coatings for friction units operated as with lubrication and without lubrication. The task of the invention is to improve the tribological characteristics of coatings based on polyamides and ensuring a high level of adhesion characteristics of the coating on unmodified metals. The problem is solved in that the composite material based on polyamide matrix and carbon filler as polyamide matrix contains the modified polyamide powder product cryogenic grinding thermomechanical combined mixture of polyamide 6 and polyethylene in a ratio of 10:10,1, and as a carbon filler is a mixture of carbon components graphite-like and diamond-like modifications and carbon-graphite fibers in a ratio of 1:1:201:1:40. table 2. The invention relates to polymeric materials and can be used in mechanical engineering for production of tribological coatings parts of friction units of machines and mechanisms of various functional the crystals, made of various coatings, including anti-wear and anti-friction. These coatings are designed based on polymer matrices of different composition and structure of the polymer, polyolefin, polyester, etc. In the composition of the polymer matrices impose various modifiers - powders dry greases, oxides, metals, silicates and other substances that alter the strength, adhesion, tribological, thermal characteristics  . The content of dispersed fillers in the polymeric matrix is from 1 to 40%, which allows a wide range to adjust the performance characteristics of composite materials. However, the introduction of a large number of filler hinders the ability of the composite coating to form a homogeneous maldetect coatings on metals. At low content of traditional fillers not achieved the desired effect.Known anti-friction coatings based on polymer matrices, mainly polyamide, the composition of which is as functional additives introduced powdered polyolefin . When the temperature in the friction zone polyolefin having a lower melting temperature than the polyamide forms on the heels of the Yu wear resistance of friction, operated without lubrication and with external lubrication. However, the presence in the composite material of the polyolefin in the form of isolated phase dramatically reduces the strength of the adhesive connection with the metal substrate. Therefore, special methods are necessary surface preparation of metal parts to ensure the required level of adhesion of the coatings. This significantly complicates the process of coating and increases their value.The prototype of the invention is a composite material based on polyamide 11, which introduced anti-friction and anti-wear additives . To provide the necessary strength adhesive compound coating to the metal substrate, the latter is treated with a solution of a special adhesive - based primer oligomer epoxy resin. After heat treatment, the adhesive in the temperature range 280-350oC for 5-20 min sublayer is formed, which provides the chemical interaction of the macromolecule nylon and metal substrates. The disadvantage of the prototype is: - lack of domestic production of polyamide 11, which leads to the necessity of imports component;geologicheskogo of the coating process and increased environmental hazard, due to the used solvents and degradation products of the primer in the process of heat treatment; - low tribological characteristics of the coatings, especially when friction without external lubrication.The task on which the invention is directed to: - the improvement of tribological characteristics of coatings based on polyamides; - ensuring a high level of adhesion characteristics of the coating on unmodified metals.The task is solved by the fact that as the matrix of the coating using a modified polyamide, representing a powdery product cryogenic grinding thermomechanical combined mixture of polyamide 6 and polyethylene in a ratio of 10:10,1, and as a carbon filler is a mixture of carbon-containing components of different modifications - GLn-like, carbon-graphite fibers in a ratio of 1:1:201:1:40 with the following content, wt.%: The carbon filler - 0,11 - 10,5 Modified polyamide - the Rest is up to 100 Compounds of composite materials for tribological coatings according to the prototype  and the invention are shown in table 1.As polyamide 11 use the deposits used powdered product Caplan (Russia).As high-pressure polyethylene used the polyethylene produced Novopolotsk "Polymir". As high molecular polyethylene used Hostalen Gur (GUR 4120) production company Voeg.Product cryogenic grinding on the basis of polyamide 6 was prepared as follows. A mechanical mixture of pellets of polyamide 6 (Grodno ON Khimvolokno) and polyethylene was subjected to thermo-mechanical mixing in the extruder screw type at temperatures 240-280oWith subsequent granulation. The obtained pellets were subjected to cryogenic grinding in the mill, rotary type, using as a cryogenic agent liquid nitrogen. Received a mechanical mixture fractions were selected to obtain a product with a particle size of 80-100 μm. As carbon-graphite fiber used fiber brand "Viscum" Svetlogorsk production "Khimvolokno". The fiber was ground in the mill dismembrator type to obtain a fraction with the size of 50-80 μm. As components of the carbon filler used industrial product brand UDAG, manufactured by CJSC "Cinta". The ratio of diamond-like and graphite-like fraction in the product UDG is 1:1. If necessary, the composition of UDAG of Mukta UDAG amounted to 310 nm.To obtain compounds of composite materials used polymer powders with a particle size of not more than 100 μm. The components were mixed in a drum-type mixer to obtain a homogeneous composition. The coating was applied using a fluidized bed method of air suspension composite material. As the substrate used samples of steel 60 PP, pre-fat and heated to a temperature of 250-280oC. the Prepared samples were placed in a mechanical suspension, resulting in the observed precipitation of particles of the composite melt with the formation of the coating. The obtained samples were investigated after 24 hours according to standard techniques. Tribological tests were carried out on a pin-on-disk sliding velocity of 1 m/s and a load of 510 MPa. The coating was applied to the mechanical part of the metal sample of steel 45. The tests were carried out without lubrication with grease oil MS-20, which was filed in the friction zone with wick. The adhesion strength of the coating was evaluated by the method of peeling angle 180o.Tribological and mechanical properties of coatings obtained from composite materials for prototype and declared with whom mponents (compounds II-IV, VIII, IX) exceeds the prototype for strength and tribological characteristics. The excess of the stated content (composition V) does not provide any additional effect, and a reduction in the content (composition I) reduces the effect. Use instead of the product cryogenic grinding thermomechanical mixture of HDPE+PA6 mechanical mixture PE and HDPE (part VII) or a mechanical mixture of PA6 and HDPE (part VI) leads to a sharp decline in strength and adhesion characteristics. The absence of nanosized carbon particles (composition X) and replace them with particles of conventional graphite (composition X) reduces the mechanical and tribological characteristics of coatings on metals.Thus, the claimed compositions in the stated ratio of the components exceed the prototype of the complex physico-mechanical, tribological and adhesion characteristics.The invention consists in the following. Thermomechanical combination of polyamide 6 and polyethylene leads to the formation of copolymer product, which has a higher thermodynamic compatibility in comparison with a mechanical mixture of the components in the same proportions. The introduction of the polymer matrix of carbon particles provide the personal force fields. Orientation leads to the formation of quasi-crystalline structures in the amorphous part of the polymer matrix, which increases the strength of the composition and the adhesive interaction of the coating with the metal substrate. Additional introduction to composite carbon fiber strengthens and increases its tribological characteristics as the friction with lubrication and without lubrication. High performance adhesive characteristics of the claimed compositions not only when applying them to the modified surface of the metal, but also on raw. This allows to form the coating in one process cycle and dramatically reduces energy consumption of the process.Thus, the claimed composition is characteristic of the invention according to the criteria of technical and technological effect.Sources of information
1. Dovgalo C. A. , jurkiewicz O. R. Composite materials and coatings based on dispersed polymer. - Minsk: Science and technology, 1992 - 256 S.2. Designing for Rilsan coatings. ELF ATOCHEM, Paris, 1999. -P. 18. - prototipo
Composite material for tribological coatings based on a polyamide matrix and a carbon filler, characterized in that it contains as is melcene thermomechanical combined mixture of polyamide 6 and polyethylene in a ratio of 10:10,1, and as a carbon filler mixture of carbon components graphite-like and diamond-like modifications and carbon-graphite fibers in a ratio of 1:1:201:1:40 in the following ratio, wt.%:Carbon filler 0,11-10,5The modified polyamide Rest to 100
SUBSTANCE: invention pertains to the technology of polymer functional materials and can be used in machine building for coating components of machines, mechanisms and transport systems, and primarily, flange joints of transport systems. The composite polymer material contains a polymer binding substance, polymer component and a dispersion additive. The polymer binding substance is polyamide 6. The polymer component is a mixture of thermoplastic, chosen from HDPE, polypropylene, PTFE with 0.75-10.5 wt % content of thermoplastic, chosen from "СЭВА", "ТПУ", "ДСТ", polyamide 49.7-50 wt %. The dispersion additive is natural silicate with content of 0.1-1.0 wt %. The functional coating method consists of two stages. At the first stage a layer with given thickness is deposited by dipping a hot base metal at 270-300°C into a pseudoliquid layer made from a composition based on polyamide 6, modified by thermoplastic, thermoplastic elastomer and natural silicate. At the second stage on the formed first layer, which is molten and at temperature of 240-270°C, a second layer of coating is deposited, by dipping in a pseudoliquid layer based on thermoplastic elastomer, modified by polyamide 6, thermoplastic, natural silicate, and then the formed coating is cooled in air.
EFFECT: invention allows for making a composite polymer coating with gradient of efficiency record on thickness suitable for providing for hermeticity and electrical insulation properties of flange joints of pipe lines.
2 cl, 4 ex, 2 tbl
SUBSTANCE: composite material is a mixture of schungite combined with a fluorine-containing oligomer in a polyamide matrix.
EFFECT: disclosed composition simultaneously improves strength, tribotechnical characteristics and hydrophobic properties.
1 cl, 1 ex, 3 tbl
SUBSTANCE: invention relates to a thermosetting composition of a coating powder, suitable for hardening at a temperature of 60-130°C. The composition includes a thermal initiation system and a resin system, in which a reaction ability of the thermal initiation system is such that the thermal initiation system ensures gelation time 2.5-1000 minutes at 60°C in butanedyol-dimethacrylate with determination in accordance with DIN 16945 with application of 1 wt % of the thermal initiation system in 99 wt % of butanedyol-dimethacrylate, and in which the quantity of the thermal initiation system is selected in such a way that when the composition of the coating powder is applied on a substrate and hardens at a temperature of 130°C for 20 min, the obtained coating sustains, at least, 50 double steps with abrasion in acetone. The resin system includes resin and a common cross-linking agent, in which resin contains reactionable nonsaturation, and in which the said reactionable nonsaturation represents double carbon-carbon bonds, bound directly to an electron-acceptor group. The common cross-linking agent is selected from a group of acrylates, methacrylates, vinyl esters, vinyl ethers, vinylamides, alkyne ethers, alkyne esters, alkyne amides, alkyne amines, propargyl ethers, propargyl esters, itaconates, enamines and their mixtures. Weight per the double bond in the resin system constitutes 100-1000 g/mol by determination with application of 1H NMR, weight per nonsaturation in the common cross-linking agent constitutes 150-870 g/mol by determination with application of 1H NMR. The composition of the coating powder is a single-component system. Also described is a method of obtaining the coating powder, a method of a substrate coating, the substrate and application of the coating powder composition for coating the thermosensitive substrate.
EFFECT: coating powder compositions by the invention combine an ability to hardening at a low temperature with good processability in an extruder without gel formation.
43 cl, 12 tbl, 7 ex
FIELD: thermosetting coating materials.
SUBSTANCE: claimed material contains polyester with carboxylic functional group and/or polyacrylate with carboxylic functional group, β-hydroxyalkylamide in which part of hydroxyls are chemically blocked, and/or fillers, and/or heat setting agent, and/or triboadditives, and/or additives such as flow controlling agent and degasification agent.
EFFECT: material of improved degasification and flow characteristics.
6 cl, 1 tbl, 3 ex
FIELD: composite materials.
SUBSTANCE: invention relates to a method for preparing compositional tribotechnical material that could be used in mechanical engineering for manufacturing tribotechnical articles and coatings for friction units of various-functional destination machines and mechanisms. Material contains 0.01-5.9% ultrafine modifier, 0.1-1.0 functional additive, and, as the rest, polyamide 6/polyamide 11 mixture. Ultrafine modifier utilized are fine particles of naturally occurring silicate-containing minerals with particle size not larger than 100 nm.
EFFECT: improved adhesive, physico-mechanical and tribotechnical characteristics.
2 cl, 2 tbl
FIELD: production of compositions from powder materials for forming coats of faint luster.
SUBSTANCE: composition is made by adding 5 to 60 weight-% of spheroidal particles to at least one resin selected from group consisting of thermosetting resins and thermoplastic resins. Average diameter of spheroidal particles is more than 10 mcm; maximum diameter of particles is about 50 mcm. Spheroidal particles are selected from group consisting of glass, ceramic or metal particles and minerals.
EFFECT: reduction of spreadability of coat; avoidance of "orange peel" on coat.
7 cl, 8 tbl, 19 ex
FIELD: organic chemistry, chemical technology.
SUBSTANCE: invention relates to derivative of α-hydroxyester and to a method for its preparing, to a method for preparing α-halohydrin intermediate compound and to a method for preparing epoxy resin from it, and to composition based on epoxy resin. Epoxy resin represents compound of the general formula: (R2)yAr(OR1'')z wherein y means values from 0 to 750; z means values from 1 to 250; Ar represents fragment comprising aromatic compounds; R1'' represents fragment comprising glycidyl; R2 represents chlorine, bromine, iodine, fluorine atom, alkyl group, cycloaliphatic group or aromatic group substituting hydrogen atom in fragment Ar. Method for preparing epoxy resin involves three stages. At the first stage method involves preparing α-hydroxyester of one or more phenols by interaction at least one or more phenols with glycidyl ester or substituted glycidyl ester. Derivative of α-hydroxyester corresponds to the formula: (R2)yAr(OR1')z wherein y, z, Ar and R2 have above given values; R1' represents fragment comprising propyl α-hydroxyester. At the second stage method involves preparing α-halohydrin intermediate compound of at least one or more phenols by interaction of derivative of α-hydroxyester, at least one or more phenols with halide hydrogen. α-Halohydrin intermediate compound has the formula: (R2)yAr(OR1')z wherein y, z, Ar and R2 have above given values, and R1' represents fragment comprising α-halohydrinpropyl. At the third stage method involves carrying out the epoxidation reaction of abovementioned α-halohydrin intermediate compound of at least one or more phenols. Composition for powder cover comprises at least two or more components wherein at least one component represents epoxy resin. Invention provides preparing epoxy resin in the absence of epichlorohydrin by using above given stages.
EFFECT: improved preparing method.
75 cl, 4 tbl, 2 ex
FIELD: powder covers.
SUBSTANCE: invention relates to a powder cover composition and to a method for its preparing that forms cover with reduced luster after hardening. Composition comprises one or some cross-linked basic polymers: cross-linked polyester, cross-linked polyurethane, cross-linked acrylated polyether and their combinations, about from 5 to 60 wt.-%; cross-linked acrylic polymer with solidification point about from 40°C to 100°C, and about 0.1 to 10 wt.-% of one or some free-radical initiating agents. Additional reducing luster and improved smoothness can be obtained by addition spheroidal particles to the powder cover composition. Proposed compositions can be used for making covers on metallic backings, such as vehicle bodies and on nonmetallic backings, such as backings made of pressed wood materials with impregnation used for making table tops of different species.
EFFECT: improved and valuable properties of covers.
21 cl, 4 tbl
FIELD: ultraviolet-hardened powder compositions based on oligoether(meth)acrylates, possible use for producing lacquer covers on both non heat-resistant (wood, plastic, assembled structures) and metallic substrates, which are used in production of furniture, construction, mechanical engineering and other industrial branches.
SUBSTANCE: ultraviolet-hardened powder composition for lacquer covers is described, including film-forming agent component in form of two-component system of oligoether(meth)acrylate and second non-saturated compound with molecular mass equal to 500-970 g/grammolecule, produced by synthesis from p-hydroxyethoxystyrene and diisocyanate, selected from a row: 1,6-hexamethylenediisocyanate, 2,4-toluyelenediisocyanate, isophoronediisocyanate, 4,4'-methylene-(biscyclohexyldiisocyanate) or produced by synthesis from p-hydroxyethoxystyrene, diisocyanate, selected from a row: 1,6-hexamethylenediisocyanate, isophoronediisocyanate, 4,4'-methylene-(biscyclohexyldiisocyanate) and multi-atomic spirits, selected from a row: neopentylglykol, 1,6-hexanediole, while two-component system of film-creating agent contains components in accordance to ratio, appropriate for ratio of non-saturated double links of oligoether(meth)acrylate and non-saturated composition with molecular mass M=500-970 g/grammolecule, within limits from 1:1 to 1:1,2, photo-initiator of benzoyl type, filling agent and degassing agent, with stated ratio of components.
EFFECT: suggested ultraviolet-hardened powder composition allows production of lacquer covers with improved properties - increased chemical stability and high level of physical and chemical properties with preservation of decorative and protective properties.
1 cl, 2 tbl, 46 ex
FIELD: powder materials for making coats of items during protracted operation at high working temperatures.
SUBSTANCE: proposed powder material contains the following components: from 40 to 65 mass-% of at least one solid epoxy resin which is semi-functional relative to thermal cross-linking by epoxy groups at equivalent mass of epoxide from 380 to 420 g/eq and ICI viscosity of melt at 150C from 2800 to 5000 mPa·s and softening temperature from 95 to 105C (A); from 15 to 35 mass-% of at least one solid linear epoxy resin on base of bisphenol A , AD and/or F whose functionality relative to thermal cross-linking by epoxy groups is equal to 2 maximum; from 15 to 30 mass-% of inorganic filler (b) and from 1 to 10 mass-% of at least one hardener. Powder material is applied on metal bases and are thermally cross-linked or hardened.
EFFECT: enhanced parameters of elasticity, wear resistance, resistance to scratching; enhanced water prooofness and corrosion resistance of coat.
12 cl,, 2 tbl, 4 ex
FIELD: chemistry; inorganic.
SUBSTANCE: invention is related to a composition for production of insulating coatings on working surfaces of parts of machines, mechanisms and process equipment, e.g., flange joints in trunk pipelines. The composition comprises the following proportion of components, % by mass: 0.1-10.0 elastic modifier, 0.1-3.0 disperse filler, 0.1-0.5 functional additive, the balance to 100 being polyamide matrix. Disperse particles of structured elastomer in the form of ground rubber of 10-100 mcm particle sizes are used as the elastic modifier. Montmorillonite, or flint, or tripoli are used as the disperse filler. Dibutyl phthalate or dioctyl phthalate are used as the functional additive. The invention makes it possible to improve adhesive, deformation and insulating properties of the coating as well as its resistance to thermal-oxidative media.
EFFECT: improvement of properties of insulating coatings.
2 tbl, 10 ex