Composite rubber mix (versions)
FIELD: rubber industry; production of molded and non-molded mechanical rubber goods, delivery hoses in particular.
SUBSTANCE: rubber mix is prepared through co-vulcanization of triple combination of elastomers: butadiene-styrene, ethylene propylene diene, butadiene nitrile or polyisoprene in three different versions. Rubber mix contains sulfur, vulcanization accelerator, zinc white, dispersing agent, antiscorching agent, resin, plasticizing agent or softener, commercial furnace carbon. Rubber mix may also contain mineral filler, bitumen, plastics, antioxidant and/or moisture absorbing agent.
EFFECT: improved strength characteristics; enhanced economical efficiency, reliability and durability.
4 cl, 2 tbl, 10 ex
The invention relates to rubber industry and can be used in the manufacture of rubber moulded and neformaly technology, in particular, in the manufacture of pressure hoses of different profiles in the manufacturing of molded parts used in the automotive industry and agricultural machinery.
It is known that unsaturated butadiene-styrene rubbers (BSC) General purpose, high complex mechanical strength and good wear resistance, good processing properties, especially oil-filled capacitor banks have insufficient UV-ozone-resistant[1, 2, 3, 4].
It is known that saturated copolymers of ethylene and propylene (EPA), nizhneprofilnaya copolymers of ethylene, propylene and dienes (ECPS) have exceptional resistance to oxidation, resistance to a range of aggressive environments, however, the expansion of applications of EPA and Epte prevents small confection tackiness mixtures based on them, a small bonding strength with metals and fabrics, low mechanical properties[1, 2, 3, 4].
It is known that vysokoperedelnyh branch, Rubezhnoe, Ukraine rubber (PI) is characteristic, in particular, high elasticity, high viscosity and good fluidity at molding; butadiene-nitrile (BOC) - high temperature resistance, good adhesion to metal lutunasobasoba[1, 2, 3, 4].
Known fire-resistant rubber mixture based on the combination of unsaturated rubbers - synthetic CIS-isoprene and butadiene-methyl-styrene in a mass ratio of 70:30 for the production of fire resistant conveyor belts, including to increase the strength of rubber synthetic textile material of the modifying additive - VAT residue production of dye VAT bright green .
The disadvantages of this rubber compounds are unsatisfactory resistance of its ozone cracking during operation of conveyor belts in the open air, insufficient durability of rubber with synthetic textile material [2, 4].
Known vulcanicola rubber mixture based on a combination of rubber - butadiene-styrene and ethylene-propylenediene in the ratio of 70:30 respectively [2, 4].
If there is a high resistance of this mixture of ozone aging a significant drawback of rubbers on the basis of the specified combination of elastomers remains low strength of their relations with polyamide, polyester and viscose yarns and fabrics [2, 4].
Closest to the invention konceptualnoj essence and the achieved technical result is vulcanicola rubber mixture based on butadiene-nitrile and ethylene-propylenediene rubbers, including zinc oxide, sulfur, stearin, M-cyclohexyl-2-benzothiazolylsulfenamide, di-(2-benzothiazolyl)-disulfide, technical is Kiy carbon and derivatives of methacrylic acid .
However, the high heat generation of this rubber compound in the manufacture, leading to ethnological her, even in the presence of positive qualities - high resistance to ozone and heat aging, good tear resistance, good cold resistance, elasticity and adhesion properties do not allow the widespread use of said rubber mixture.
Therefore, the claimed invention is not only aimed at stabilizing atmospheric ozone-resistance, to increase cohesive strength of the rubber and the adhesive rubber ties with polyamide, polyester and viscose yarns and fabrics, but also to a significant improvement of technological properties offer rubber compound in the production of it, to increase the strength properties of vulcanizates of this mixture.
This object is achieved by covulcanization triple combination of elastomers - nitrile butadiene (branch, Rubezhnoe, Ukraine), ethylene-propylenediene, butadiene-styrene through the application of the proposed rubber compound sulfur technical, vulcanization accelerators of high activity, ultraparallel, vulcanization activators, dispersants, semi-active and low carbon technical, mineral fillers, softeners, plasticizers, crushed rubber, bitumen, resins, Zam is litely podocarpaceae, antioxidants, plastics, moisture absorbers, organic pigments, oil bitumen in the following ratio, wt.%:
|(branch, Rubezhnoe, Ukraine)||1-20|
|The vulcanization accelerator||0,01÷4,5|
|The vulcanization activator||0,1-10,0|
|Mineral filler||n/a b 45|
|The plasticizer||n/b 20,0|
|Carbon technical oven||n/b 40,0|
|The moderator of podocarpaceae||0,1-2,0|
|Organic pigment||n/b of 1.5|
|Bitumen oil||n/b 15|
A distinctive feature of the proposed rubbers the howl of the mixture is present in the elastomeric composition framework in addition to butadiene-nitrile and ethylene-propylenediene rubbers, the third elastomer is a butadiene-styrene with a high uniformity of properties vysokoperedelnogo rubber for stabilizing the rheological characteristics of the mixture, improving the mechanical properties of vulcanized rubbers and improving the economic performance of finished products.
The proposed solution allows to obtain a modified composite mixture with a complex of specific technical properties and to improve the technological her behavior at all stages of the production of rubber products.
The technical result of the proposed reflected in the improvement of structural, operational and economic characteristics of rubber products, improving their reliability and durability.
For better alignment and covulcanization vysokoperedelnyh rubber - nitrile butadiene (BOC) or branch, Rubezhnoe, Ukraine (PI), butadiene-styrene (BSC) with discoveredin rubber - ethylene-propylenediene (ECPS) in low-speed, rotary type Banbury rubber mixer RSVD-250 with a rotor speed of 20-30 rpm used pre-load in the camera RSVD Epte with accelerators and vulcanization activators, dispersants, with input 2/3 carbon technical for partial pozwolenie the AI Epte, education intermediate structures and increase the rate of vulcanization of the Epte. The temperature of the mixture in the chamber RSVD supported within 95-100°C. Further input vysokoperedelnyh rubbers (BNK, PI, BSC) and other components are produced for 5 min prior to discharge of the mixture from the chamber RSVD 2 admission. Enter vulcanizing group for 30 seconds to discharge from the chamber RSVD. Blending a mixture of at listvennyh rollers must be equal to the time of mixing it in the camera RSVD. The total time of mixing the mixture is 13÷16 minutes
Mixing the composite mixture can be single-stage or two-stage. In the case of the two-stage mixing podocarpaceae Epte produced in the first stage.
The process of manufacturing the composite mixture in colour is produced on mixing rollers 1500 660/660 preliminary podocarpaceae Epte by the dissolution of the Epte at a temperature of 90÷100°and input accelerator-activator groups, dispersing agents, with serial input components 4-5 reception, input vulcanizing group vysokoperedelnyh rubbers for 5 min to cut and pass the mixture to thin. The total mixing time is 57-60'.
The invention is illustrated by examples 1-10, the compositions presented in table 1.
Vulcanization characteristics and physico-mechanical properties developed what's compositions are shown in table 2.
Physico-mechanical properties were determined according to GOST 270-75, GOST 263-75 on standard samples, vulcanizing compression molding in the optimum vulcanization 30'×143°C.
The proposed composite mixture has a satisfactory rheological properties and curing characteristics, ready vulcanizates from it have a good set of strength, elasticity and adhesion properties.
The COMPOSITE COMPOSITIONS of RUBBER COMPOUNDS BASED ON STYRENE-BUTADIENE, ETHYLENE-PROPYLENEDIENE AND BUTADIENE-NITRILE (branch, Rubezhnoe, Ukraine) RUBBER
|no PP||Name of materials||The placeholder||The PROPOSED EXAMPLES, MASS%|
|- SCS-30 apkm-15||35||20||25||15||15||45||15||50|
|- SCS-30 ARKN||25||30|
|3.||Nitrile butadiene rubber:||70,0|
|- BNX-28 AMN||5||1||5||20|
|Branch, Rubezhnoe, Ukraine rubber:|
|5.||The vulcanization accelerators: - N-N1-Dithiodimorpholine||3,0||1,5||0,03||2,0||0,5||1,8||1,0||0,4||2,5||2,0|
|- Diethyldithiocarbamate zinc||1,41|
|- Thiuram "D" (tetramethyluronium the ID)||0,5||0,7|
|- Captax (2-mercaptobenzthiazole)||0,01||0,3|
|- Altax (di-2-benzothiazolyl)-disulfide||1,1||3,0||1,7|
|- Sulfenamid C (N-cyclohexyl-2-benzothiazolylsulfenamide)||0,9||1,0||1,0||0,9||1,0||1,6|
|6||The mixture of products (I) and (II) in the ratio of 0.5:1||3,0||/td>|
|7.||The vulcanization activators:|
|- Zinc white BCOM||5,0||2,6||5,0||0,1||5,0||10,0||4,0||3,5||4,5||4,0||3,5|
|- Stearic acid||1,5||0,5||0,89||3,0||1,5||2,0||1,0||2,8||1,7|
|- Diethylene glycol||1,0||,2|
|- Pine rosin||2,0||1,0||1,0|
|10.||Softeners:||- Oil industrial||10,0||2|
|13.||the technical carbon furnace||16||25||6||40||10||5||6||10|
|14.||Carbon black furnace MP-324||50,0|
|15.||Mineral fillers and dyes:|
|- Turity concentrate||7||4||1||2||6||45|
|- The chalk is th||1||19||25|
|- Dolomite filler||8||14|
|- Black white BS-100||3||9||8|
|- Low molecular weight polyethylene||2,0|
|- High-pressure polyethylene||3,0|
|18.||The breathers: Paste calcinate||1,0||3,0||10,0||1,0|
|20.||The moderators of podocarpaceae:|
|- Phthalic anhydride||0,8||2,0||1,6|
|The total mixing time, minutes RSVD-250-30, CM 1500/660/660||I Art. - 7 article II - 8||I St - 7 article II - 9||12||13||12||I Art. - 7 II 8||11||12||55||57|
RHEOLOGICAL properties of COMPOSITE RUBBER MIXTURES BASED ON BUTADIENE-NITRILE (branch, Rubezhnoe, Ukraine), ETHYLENE-PROPYLENEDIENE AND BUTADIENE-STYRENE RUBBERS, KINETICS of VULCANIZATION AND THEIR PHYSICO-MECHANICAL properties of VULCANIZATES
|no PP||Indices||The placeholder||The actual value|
|1.||Plasticity in the Carrera||0,20||0,32||0,34||0,37||0,36||0,30||0,35||0,27||0,25||0,36||0,38|
|2||The Mooney viscosity (MB 1+4) 100°||85||68||69||71||70||65||65||61||75||51||48|
|3||Podocarpaceae 120°C, min|
|5||Conditional tensile strength, MPa||16,0||17,2||17,8||16,0||of 17.0||16,9||16,8||17,7||the 17.3||16,4||16,8|
|6||Relates. elongation at break, %||340||370||380||390||360||400||360||380||320||320||390|
|7||Relates. leave deformation after the break, %||10||8||8||4||8||4||8||8||8||4||4|
|8||Hardness shore a||70||64||65||66||61||68||63||59||61||55||58|
|9||Resistance to ozone aging when volume concentration of ozone (50+5)·10-8% within 72+2 hours at a temperature of (40±2)°||bear >144 h|
|10||The bonding strength between the layers when the bundle N/cm||38||44||45||40||37||48||42||38||39||39||41|
|11||Tear resistance, kgf/cm||73||77||81||80||85||88||81||82||80||82||78|
|12||Temperature limit fragility, °||-35||-43||-42||-40||-39||-38||-36||-35||-36||-35||-36|
Sources of information
1. Ipharm is new. Synthetic rubber. - L.: Chemistry, 1983
2. Phew AU, Kornev, Amochaev. The common technology of rubber. - M.: Chemistry, 1978 /analog/.
3. Directory of reinsta. - M.: Chemistry, 1971
4. Aesome, Amochaev, Anteverted. Technology elastomeric materials. - M., 2000
5. A.S. SU # 1770328 A1 (similar)
6. A.S. SU # 1047933 And 15.10.1983 (prototype).
7. Manufacturing technology of rubber compounds based on a combination of Sept - SKN rubbers. Recommendation No. 51-RM-20-1074-85.
8. Development YAPI together with plants RTI (Yaroslavl, bila Tserkva). 1985
1. Composite rubber mixture comprising butadiene-styrene and ethylene-propylenediene rubbers, butadiene-nitrile or branch, Rubezhnoe, Ukraine rubber, sulfur, vulcanization accelerator, a vulcanization activator - zinc white, dispersant, retarder of podocarpaceae, resin, softener, furnace carbon black, mineral filler and, if necessary, a softening agent, bitumen, plastics, antioxidant and/or desiccant in the following ratio, wt.%:
|Nitrile butadiene or branch, Rubezhnoe, Ukraine rubber||1-20|
|Sulfur||0,05-3,0||The vulcanization accelerator||of 0.01 to 4.5|
|The vulcanization activator - zinc white||0,1-10,0|
|The moderator of podocarpaceae||0,1-2,0|
|Resin||Not more than 5|
|Furnace carbon black||5-40|
|Softner||No more than 1|
|Bitumen||No more than 7|
|Plastic||No more than 2|
|Antioxidant||No more than 2|
|Desiccant||Not more than 10|
2. Composite rubber mixture comprising butadiene-styrene and ethylene-propylenediene rubbers, butadiene-nitrile or branch, Rubezhnoe, Ukraine rubber, sulfur, vulcanization accelerator, a vulcanization activator - zinc white, dispersant, retarder of podocarpaceae, resin, softener, mineral filler, antioxidant, organic pigment in the following ratio, wt.%:
|Nitrile butadiene or branch, Rubezhnoe, Ukraine rubber||1-20|
|The vulcanization accelerator||3,6-4,2|
|The vulcanization activator - zinc white||3,5-4,0|
|The moderator of podocarpaceae||0,5-0,7|
3. Composite rubber mixture comprising butadiene-styrene, ethylene-propylenediene branch, Rubezhnoe, Ukraine and rubbers, sulfur, a vulcanization accelerator, a vulcanization activator - zinc white, dispersant, retarder of podocarpaceae, softener, furnace carbon black, petroleum bitumen and plastics in the following ratio, wt.%:
|The vulcanization accelerator||1,7|
|The vulcanization activator - zinc white||4,5|
|The moderator of podocarpaceae||0,6|
|Furnace carbon black||3|
FIELD: production of rubber articles from rubber mixtures for manufacture of frost-resistant shock-absorbing rail fasteners.
SUBSTANCE: rubber mixture is produced by mixing of butadiene- styrene rubber having 22-25 weight parts of styrene, and synthetic cis 1,4-polyisopropene rubber of curing group, consisting of sulfur, N-cyclohexyl-2-benzthiazolyl sulphenamide, melt of w, w'-hexachlorparaxylene in shielding wax and N, N'-dithiodimorpholine, zinc oxide, synthetic fatty acids of C17-C20 fraction, N-phenyl-N'-isopropyl-n-phenylenediamine, petroleum bitumen, kaolin, technical-grade carbon, age resistor and plasticizer. Mixture additionally contains divinyl rubber with cis 1,4 link content of from 85 to 95 wt%, Vaseline oil and polymerized 2,2,4-trimethyl 1,2-dihydroquinoline.
EFFECT: increased frost resistance and improved resistance to formation and development of cracks.
FIELD: rubber industry.
SUBSTANCE: invention relates to synthetic rubber, rubber-technical articles and tire industry, namely, to compositions based on stereoregular polydienes. The composition based on "lanthanide" cis-1,4-butadiene rubber comprising a modifying agent that is represented by butadiene-styrene rubber prepared by the dissolved co-polymerization of butadiene and styrene monomers in the presence of a lithium-organic catalyst.
EFFECT: decreased plasticity of rubber.
2 tbl, 9 ex
FIELD: chemistry of polymers, chemical technology.
SUBSTANCE: invention relates to isobutylene-base polymeric composition, namely to mixtures of semicrystalline ethylene copolymers with brominated butyl rubber. Semicrystalline ethylene copolymers represent a statistic copolymer prepared from ethylene monomers, one or some other monomers taken among the order comprising alpha-olefins comprising from 4 to 10 carbon atoms and optionally one or some dienes. Semicrystalline ethylene copolymer comprises ethylene links in the amount, at least, 45 wt.-% as measured for mass of this semicrystalline copolymer. Polymeric composition is prepared by mixing isobutylene-base polymer and semicrystalline ethylene polymer and the polymeric composition can comprise additionally amorphous polymer, oil, low-molecular polybutenes, antioxidants, stabilizing agents, filling agents, pigments and carbon black. Prepared polymeric mass shows the stress value from 0.1 to 1 MPa at elongation of sample by 100% at 50°C, air penetrability of vulcanized mixture is less 8 x 10-8 cm3 x cm/cm2 x s x atm at 65°C.
EFFECT: improved properties of mixtures.
4 cl, 5 tbl
FIELD: organic chemistry, rubber industry.
SUBSTANCE: invention relates to a vulcanizing composition comprising rubber vulcanized with sulfur, sulfuric vulcanizing agent, accelerating agent taken among a group comprising of non-thiazolsulfenamide accelerating agents and agent providing stabilization of hardness that comprises derivative of pyrimidine of the formula (I):
wherein X represents hydrogen atom (H), radical from R1 to R4, NR3R4, OR5, SR5, SO2R6, M, (SO3)zM (wherein M represents metal ion); n and z can be similar or different and = 1, 2 or 3 depending on the corresponding valence of X and M = 1, 2 or 3; radicals from R1 to R4 are similar or different and taken among the group comprising of H, halogen atom, -OH, -NH2, alkyl, cycloalkyl, aryl, alkylaryl, alkylaryl, aralkyl and each among substitutes has optionally additional functional groups taken among the group consisting of -NH2, -OH, substituted amino-group, substituted hydroxyl, halogen atom and carbonyl-containing group; R3 and R4 in the same link in common with nitrogen atom (N) can form a heterocyclic group; R5 can mean any radical from R1 to R4 formed by carbon-base heterocyclic group comprising at least one sulfur (S) or nitrogen (N) atom or both S and N; R6 is taken among any radical from R1 to R4, -OH, -OM, -OR5, -NH2, NR3R4. The corresponding amount of accelerating agent and hardness stabilizing agent is effective in order to not inhibit vulcanization and to stabilize hardness property of indicated rubber after vulcanization. The amount of accelerating agent in indicated composition is above about 0.6 part per 100 parts of rubber when indicated rubber represents butadiene styrene rubber (SBR), and at least 0.5 part per 100 parts of rubber when indicated rubber represents the natural rubber, and the amount of the hardness stabilizing agent is at least about 0.5 part per 100 parts of rubber. Also, invention involves a method for enhancing hardness stabilization of the composition comprising rubber vulcanized with sulfur by addition of above indicated accelerating agents and pyrimidine derivative to the composition.
EFFECT: valuable properties of compounds.
28 cl, 8 tbl, 4 ex
FIELD: preparation of compositions for cables filling.
SUBSTANCE: the invention is pertaining to preparation of compositions for filling the cables used in the field of a distant data transmission. Prepare a composition containing (in mass %): a mineral or a synthetic oil - 70-90, the hydrogenated block of styrene and butadiene copolymer with radial structure - 2-15, polyethylene wax - up to 12. The block of the copolymer can be synthesized using silicon tetrachloride or stannic chloride. The technical result of the invention consists in improvement of the index of compositions drops-protection and a stability augmentation.
EFFECT: the invention ensures improvement of the index of compositions drops-protection and a stability augmentation.
7 cl, 2 tbl, 3 ex
FIELD: rubber industry.
SUBSTANCE: invention concerns a method for grafting polymers based on conjugated diene monomers to brominated butyl rubbers and using thus obtained grafted copolymers in rubber compositions, which, after vulcanization, acquire improved physical characteristics. Grafting procedure comprises mixing solid brominated butyl rubber with solid polymers based on conjugated diene monomer including some quantity of bonds C-S-(S)n-C with n being an integer equal from 1 to 7. Mixing is conducted at temperature above 50 over a period of time long enough to complete the grafting. Rubber composition containing above grafted polymer optionally includes one or more curing agents. Cured rubber composition is intended for manufacturing tracks.
EFFECT: increased shock-absorbing capacity of products.
14 cl, 5 dwg, 5 tbl, 3 ex
FIELD: chemical and petrochemical industries.
SUBSTANCE: the invention is pertaining to the field of chemical and petrochemical industries, in particular, to a polymeric composition and a method of its production. The method of production of a polymeric composition includes introduction of the maleinized polybutadiene containing from 10 up to 24 mass % of maleinic anhydride into a polymerizate, formed after termination of a synthesis of a block copolymer of A-B-A type and-or a block copolymer of (А-B)nX type, where "A" - is a vinylaromatic block, "B" - is a conjugated diene polymeric block, "X" -is a residue of a combining agent, "n" - is an integer equal from 2 up to 4, at a mass ratio of the indicated block of the copolymer and maleinized polybutadiene making 100 : (10-20). After that the target polymeric composition is separated from the reaction mass and dry up to the contents of the volatile impurities is no more than 0.2 mass %. The technical effect is development of a simplified method of production of a polymeric composition, which has an increased resistance against a multiple bending and an increased adhesion.
EFFECT: the invention ensures a simplified method of production of a polymeric composition with increased resistance against a multiple bending and an increased adhesion.
4 cl, 6 ex
FIELD: rubber industry.
SUBSTANCE: invention relates to preparation of rubber compound based on butadiene-nitrile rubber for manufacturing thin-walled technical rubber products, for instance membranes. Rubber compound preparation process comprises processing butadiene-nitrile rubber on mixing rolls for 5 min at starting temperature 45-55°C, adding zinc white for 2 min and half-amount of carbon black (K-354) for 6 min, whereas the rest of carbon black K-354 is added later portionwise. Further follow: addition of acetonanyl for 8 min at roll temperature 90-100°C, addition of sulfenamide C for 2 min, passage of mix through thin gap 3 times for 3 min, addition of carbon black T-900, dibutyl sebacate and stearic acid for 10 min, addition of N,N'-dithiodimorpholine and thiuram D for 2 min each, stirring and passage of mix through thin gap 3 times for 5 min, after which cutting is effected for 3 min.
EFFECT: prevented agglomeration and achieved uniform distribution of acetonanyl and sulfenamide C in rubber compound, improved processability of the latter, and reduced percentage of inclusions-caused refuse.
FIELD: rubber industry; chemical industry; production of the vulcanized rubber mixture made on the basis of an acrylate rubber and partially on the hydrogenated butadiene-nitril caoutchoucks.
SUBSTANCE: the invention is pertaining to production of the vulcanized rubber mixture made on the basis of the acrylate rubber and partially on the basis of the hydrogenated butadiene-nitril caoutchoucks, which is used for manufacture of the hardware products operable at the temperatures up to 150°С and having the heightened wear resistance and which may be used in production of the industrial rubber products - the rings, the sleeves gaskets, the drive belts operating in the friction pairs at the heightened temperatures. The vulcanized rubber mixture made on the basis of the acrylate rubber of the heightened wear resistance includes the mineral filler, the engineering carbon, the antioxidant, the plasticizer, the partially hydrogenated butadiene-nitril caoutchouck, the quaternary ammonium base, the metallic stearate, the brimstone, the vulcanization accelerators, zinc oxide, the anti-adhesive agent, the anti-scorching agent. The rubber mixture made on the basis of the acrylate rubber of the heightened wear resistance allows to increase the level of the values of the indexes: the wear resistance, the tensile strength, the frost hardiness, the resistance to the action of the aggressive mediums of the aromatic series.
EFFECT: the invention ensures the increased level of the values of the indexes of the rubber mixture made on the basis of the acrylate rubber of the heightened wear resistance: the wear resistance, the tensile strength, the frost hardiness, the resistance to the action of the aggressive mediums of the aromatic series.
3 cl, 2 tbl
FIELD: polymer materials.
SUBSTANCE: polymer composition suitable for use in various national economy branches, in particular in cable industry, is constituted by, weight parts: chloroprene rubber or its combination with butadiene-nitrile rubber, 100; zinc oxide as vulcanization agent, 1-5; vulcanization accelerator selected from group: sulfur, thiuram, diphenylguanidine, Captax, or a mixture thereof, 1.0-3.25; vulcanization activator selected from group: magnesium oxide and stearic acid, 3.5-10.0; stabilizer: acetonanyl, diaphene FP, naphtam-2, 2-3; dibutyl phthalate as plasticizer, 10-20; paraffin as antiozonant, 2-8; fillers: carbon black 47-52 and kaolin 5-22; polybutadiene as modifier, 0.1-10.0; and, additionally, alumina trihydrate, 50-60.
EFFECT: enabled preparation of composition showing resistance to flame propagation, low fume evolution, high frost and oil resistance with physico-mechanical characteristics preserved.
2 cl, 3 tbl
FIELD: polymer materials.
SUBSTANCE: friction material composition relates to the area of creating novel composites with polymer matrix. Composition is destined for use in oil-cooled arrangements of mobile machines and process equipment. Composition contains synthetic rubber, curing group, phenol-formaldehyde resin, layered silicate, polysulfone fiber, and dispersed fillers in the form of oxides and sulfates of metals selected from barium, zinc, titanium, copper, iron, magnesium, and calcium.
EFFECT: increased wear resistance and coefficient of friction of friction material in an oil medium, and stabilized coefficient of friction in transition processes.
FIELD: rubber industry.
SUBSTANCE: in particular, invention relates to rubber compound for manufacturing butadiene/nitrile rubber-based insertion-type rubber products for fuel and oil systems of motor transport. Rubber compound containing 30.00 wt parts of paraffinate butadiene/nitrile rubber and 0.30 wt parts of high-saturation hydrogenated (degree of hydrogenation 93-99%) butadiene/nitrile rubber having 18% of acrylonitrile additionally includes, wt parts: sulfur 0.30, magnesium oxide 2.00, zinc oxide 5.00, carbon black P-803 50.00, carbon black P-514 25.00, dibutyl sebacate 10.00, Peroxymon F-40 10.00, Diaphen FP 1.50, and acetoanyl R 1.00. Such composition of rubber compound provides effective oil, frost, and heat resistances to rubber and resistance thereof to ozone and thermal ageing, which makes it possible for hose-shaped rubber products to have long-term (up to 15 years) service durability.
EFFECT: improved consumer's property of rubber.
FIELD: rubber industry, medicine.
SUBSTANCE: invention proposes the composition for making medicinal technique articles comprises the following components, mas. p. p.: food butadiene-nitrile rubber, 100; polyvinyl chloride resin, 40.0-55.0; highly dispersed amorphous silica, 10.0-15.0; chalk, 40.0-60.0; dibutylphthalate, 35.0-40.0; zinc white, 1.0-1.5; stearic acid, 1.0-1.5; sulfur, 1.5-2.0; thiuram D, 0.35-0.4; thiazole 2MBT, 0.2-0.3 and diphenylguanidine, 0.2-0.3. The composition comprises additionally the following components that are thermodynamically incompatible with rubber, mas. p. p.: polymethylsiloxane liquid, 1.0-1.5; paraffin, 1.0-1.5, and technical carbon as a dye, 0.05-0.1. The composition provides preventing the release of components on the surface that effect pH value, turbidity change, oxidizing capacity and dry residue of the extract. Invention can be used in making articles of medicinal technique - rubber stoppers for sealing glass containers with infusion solutions, blood, blood substitutes and medicinal preparations for internal and external using prepared by industry and in pharmacy.
EFFECT: improved and valuable properties of composition.
4 tbl, 1 ex
FIELD: polymer materials.
SUBSTANCE: invention relates to olefin thermoplastic elastomers obtained by the method of "dynamic" vulcanization of ethylene-propylene-diene or butadiene-nitrile rubber jointly with polyolefins, which elastomers can be used in manufacture of technical rubber products as well as in fabrication of articles in automotive, cable, and shoe industries. Thermoplastic elastomer composition is made up of, wt %: isotactic polypropylene 20-40, synthetic rubber 44.9-73.2, organic peroxide 0.2-2.0, mineral oil 1-10. filler 0.4-5.0, melt flow-improving additive 0.5-1.0, 3,5-di-tert-butyl-4-hydroxyphenylpropionic acid pentaerythrityl ester (Irganox 1010), propionic acid 3,3-thio-bis(dioctadecyl) ester (Irganox PS 802), and 3,5-bis(1,1-dimethylethyl)-4-hydroxy-2,2-(3-(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)-1-oxopropyl) hydrazide (Irganox 1024). Composition contains low-density polyethylene with fluidity index between 7.0 and 100.0 g/10 min at 190°C and loading 2.16 kg as melt flow-improving additive. As cross-linking co-agent, composition may contain methacrylate or vinyl butyrate.
EFFECT: increased surface strength of molded products, improved abrasive resistance, and reduced scratch of products.
2 cl, 2 tbl, 18 ex
FIELD: rubber composition for production of cup-type seals.
SUBSTANCE: claimed butadiene-nitrile rubber composition contains (mass pts): powdered fluoroplastic as antiwear additive 10-18; sulfur 2.5; altax 2.7; zinc white 7.5; diphenylguanidine 0.25; aldol-α-naphthylamine 4.0; neozone D 1.0; furnace carbon black 120; dibutilsibacinate 20; santoflex IP 1.0; stearic acid 1.0.
EFFECT: cup-type seals with increased abrasive resistance, durability and reduced friction coefficient.
FIELD: polymer materials.
SUBSTANCE: invention relates to thermoplastic elastomer composition of propylene polymers and to articles obtained therefrom by means of injection casting technique. Composition is characterized by melt flow rate value (MFR 2) as measured according ISO method 1133 at 230°C under loading 2.16 kg within a range of 3 to 30 g/10 min and contains: (A) 50 to 90 wt % one or several propylene polymers including at least 85 wt % of fraction insoluble in xylene at room temperature and selected from group consisting of random propylene-ethylene copolymers with 1-7 wt % ethylene, propylene/C4-C8-α-olefin copolymer with 2-10 wt % C4-C8-α-olefins, propylene-ethylene/C4-C8-α-olefin copolymers with 0.5-5 wt % ethylene and 2-6 wt % C4-C8-α-olefins; and (B) 10-50% propylene copolymer containing 8-40 wt % ethylene and optionally 1-10 wt % C4-C8-α-olefins. Above-mentioned melt flow rate value MFR 2 for composition is obtained by way of destroying composition precursor containing the same A and B copolymers in above-mentioned proportions but differing in melt flow rate value (MFR 1), which ranges from 0.1 to 5 g/10 min. while MFR 2/MFR 1 ratio varies between 1.5 and 20. Articles made from the composition are characterized by good flexibility, good resistance against impact loads even at low temperatures, good optical properties, in particular opacity, and low level of chemicals emission.
EFFECT: improved consumer's properties of articles obtained from composition.
6 cl, 2 tbl, 8 ex