Abstracts

№5, 2015

Effect of Surface Fluorination of TPE on Their Abrasion – Petrova G.N., Perfilova D.N., Rumyantseva T.V. (P. 4)

Modification of TPE based on polyethers by surface fluorination has been studied. Abrasion resistance was measured by Taber (model 5131) abrasion tester. Two test regimes were in use, adequate results were obtained by the lighter one. Increase of abrasion resistance of TPE is shown. The lower effect of modification is shown for TPE compositions of phosphorocontaining fireproofing compound. Increase of modification time nearly doesn’t effect the abrasion resistance.

Key words: polyether thermoplastic compositions, surface modification, fluorination, abrasion resistance, abrasion tester

Solid-Phase Mechanochemical Halide Modification of Natural Rubber SVR 3L by Chlorine-Containing Compound – Mikhaylov I.A., Andriasyan Yu.O., Popov A.A. , Mastalygina E.E. (P. 8)

Modification of NR by mixing in mill with modifier C30H38Cl24 (chlorine content 70%) has been studied. The best results obtained at mixing time from 10 to 20 min and amount of modifier 4 phr. Rubber compounds based on rubber modified in this time-temperature and MM interval has the higher torque and lower vulcanization time, vulcanized rubber compounds are of higher strength and other mechanical properties. Increase of modifier amount adversary affected all this properties. Bound chlorine content for all the modified rubbers was determined. Method of mechanical halide modification is based on the initiation of radical decomposition of polymer; obtained radicals take part in biomolecular reaction with acceptor of radicals. This method permits the galogenation of polymers without the use of gaseous halogens both in solution and solid phase.

Key words: solid-phase modification, chlorine containing modifier, NR, mill, properties of rubber

The Study of Modifying Effect of Additives of Polymethylene-p-Threephenyl Ester of Boric Acid in Rubber-Based Composite Materials. Part 3 – Korabelnikov D.V., Lensky M.A., Ozhogin A.V., Nartov A.S., Anan’eva E.S. (P. 12).

Results of the study of rubber containing friction materials of high heat resistance modified by addition of polymethylene-p-threephenyl ester of boric acid are presented. Methods of IR-spectroscopy and dynamic mechanical analysis were in use. Presence of modifier results in the change of IR-specters and the dynamic storage modulus in the temperature interval of the glass transition. The conclusion is drown about formation tree-dimension interpenetrating networks in compositions in presence of modifier. Increase of strength and heat- and wear resistance of modified compositions may be considered as a result of formation of these networks. Modification is recommended for the other rubber containing compositions.

Key words: friction composition, brake linings, polymethylene-p-threephenyl ester of boric acid, modification, coefficient of friction, wear resistance, strength, heat resistance, IR-spectroscopy, dynamic modulus, glass transition, tree-dimension interpenetrating networks

Development of Flame Retardant Rubber on the Base of General Purpose Rubbers – Petrova N.P., Ushmarin N.F., Gnezdilov D.O., Koltsov N.I. (P. 16)

Properties of technical rubber compounds based on blend of isoprene (SKI-3) and butadiene (SKD) rubbers of sulfur vulcanizing system and different fireproofing agents were studied. Three types organoclays (Cloisite 10А, Cloisite 15A, Cloisite 30B), hydroxides of aluminum, calcium and magnum as well as barium borate were in use. Partial replacement of antimony trioxide in rubber compound by each of these agents results in improvement of rheological, vulcanization properties of compounds and physical and mechanical properties of vulcanizates as well as combustion time, oxygen index and DGA characteristics. The best results are shown at the use of Cloisite 15A. The compound of the 5 phr of antimony trioxide replaced by 10 phr of Cloisite 15A is recommended as noncombustible rubber of improved physical and mechanical properties and resistance to thermo-oxidative degradation.

Key words: blend of isoprene and butadiene rubbers, noncombustible rubber, antimony trioxide, organoclays, hydroxides of metals, barium borate, rheological, physical and mechanical properties, thermo-oxidative degradation

Effect of Structure of Para-phenylenediamine Antidegradants on the Tensile Characteristics and Hysteretic Properties of Rubbers – Poldushova G.A., Kandyrin K.L. Reznichenko S.V. (P. 20)

Properties of rubber compounds based on isoprene rubber SKI-3, filled with carbon black or silica and containing different derivatives of para-phenylenediamine as antidegradants has been studied. Tensile characteristics and tgδ at 60°С measured by RPA 2000 were determined before and after aging. Effects of the structure and the size of alkyl moiety at the N atom as well as type of filler were shown. In carbon black-filled rubbers presence of all para-phenilenediamine derivatives results in increase of tg δ, while in the silica filled ones the antidegradants of short chain moiety provided the decrease of tg δ. Some conclusions on mechanism of such difference and recommendation on the use of the new antidedeteriorants are presented.

Key words: para-phenylenediamine antidegradants, carbon black, silica, termal aging, hysteresis loss

Comparative Study of Conductive Grades of Carbon Blacks “OMCARB” Series and Rubber Compounds Based on NR – Moiseevskaya G.V., Razdyakonova G.I., Karavaev M.Yu., Petin A.A., Strizhak E.A. (P. 24)

Results of comparative study of conductive carbon blacks “OMCARB”, and standard rubber compounds based on NR are presented. Specific electrical resistance was measured for carbon blacks grades C40, CH140, CH200, CH210, and CH600, morphology was studied by transparent electron microscopy. For rubber compounds filled with these carbon blacks were measured rheological, electro-physical, physical and mechanical properties. Dynamic properties, namely tgδ, were measured in temperature interval from -60 to +60°C with the use of mechanical analyzer DМА-242D. Different values of tgδ at -60°C and +60°C, correlated with different properties of tire, and other properties of rubber filled with studied carbon blacks open the possibility to recommend the carbon blacks “OMCARB” for different rubber goods.

Key words: conductive carbon black, specific resistance, morphology, physical and mechanical properties, tgδ

On Increase of Efficiency of Application of Nano-Dispersed Carbon Fillers of Various Nature in Elastomeric Compositions – Ershov D.V., Naumenko L.S., Lesik E.I., Khudolei M.A., Red’kin V.E., Lapkovskaya E.Yu. (P. 28)

Different ways of increase of activity of carbon fillers of various nature are studied. Fillers studied are different structural modification of carbon: carbon blacks of different grades, fine disperse graphite, ultra disperse synthetic diamonds, disperse products of biochemical treatment of carbon, and fullerene. Among methods of treatment may be in use rotating magnetic field, thermotreating in nitrogen, ultrasonic treatment, wet treatment in granulator, and some others. Various ways of pre-activation and subsequent combination with carbon black are in use. The most efficient way to obtain the best properties of rubber compounds based on styrene-butadiene rubber is the combination of pre-activated disperse fillers with carbon black in water phase.

Key words: Nanoparticles, carbon fillers, modification, pre-activation, carbon black, reinforcement, styrene-butadiene rubber.

The Study of the Stages of Mixing Process of a Model Mixture of Rubber and Carbon Black by Brabender’s Plastograph – Kablov V.F., Kurakin A.Yu., Aleksandrina A.Yu. (P. 32)

Mixing of styrene-butadiene rubber SKS-30 ARKM-15 with carbon black N234 (65 phr) in Brabender’s plastograph has been studied. The changes of torque, magnitude of torque, temperature of rubber composition, amount of connected rubber in the process of mixing were measured. In the process of mixing were measured also parameters X determining the quality of mixing, and Y characterizing the presence of carbon black particles of more than 23 mkm in size according ISO 11345 и ASTM D2663-14 by Dispertester-3000 as well as dynamic storage modulus by RPA-2000. Stages of mixing process by different methods were correlated. The characteristic points of the process are established. The possibility to develop the mixing process by characteristic points on the diagrams is shown.

Key words: rubber, carbon black, mixing stages, torque, torque magnitude, duration of mixing, quality of mixing, dynamic storage modulus, temperature of rubber composition, amount of connected rubber

Specific Features of Structural Formation of Fluoroelastomers by Flouroperoxides – Chapurkin V.V., Medvedev V.P., Chapurkin S.V. (P. 36)

Vulcanization of fluoroelastomer SKF-32 by different flouroperoxides: o-SO2CHF2-C6H4CН[OOC(CH3)3]2 (I), SO2CHF2-C6H4C(CH3)[OOC(CH3)3]2 (II), C6F5C(OH)(CF3)OOC(CH3)3 (III), (C6F5)2C(OH) OOC(CH3)3 (IV), and CF3(CF2)3CH (OH)OO(CH3)3 (V) has been studied. With peroxides I – IV (2 phr) two-stage vulcanization was in use. Strength of all vulcanizates is higher than in the case of standard peroxides and even higher after heat aging. Especially efficient are peroxides III and IV. In the case of peroxide V (3 – 5 phr) strength before aging is higher and brittleness temperature is lower (-45°C) than in the case of benzoyl peroxide (-40°C). The use of the new peroxides improved mechanical properties after aging and can be recommended for vulcanization of SKF-32.

Key words: flouroperoxide, fluoroelastomer SKF-32, vulcanizates, strength properties, aging resistance

Mathematical Model of Bulk Polymerization of Isoprene – Elfimov V.V., Yulenets Yu.P., Markov A.V., Avetisian A.R., Elfimov P.V. (P. 38)

Mathematical model of isoprene polymerization process in bulk is considered. The model describes temperature and conversion fields through the reactor width in arbitrary time moment at various reactor wall temperatures. Due to theoretical analysis performed the operating thermal regime of the reactor is selected. This regime provides variation of the reactor wall temperature during polymerization process and makes possible the deep conversion in a short time.

Key words: isoprene polymerization in bulk, mathematical model, thermal regime, conversion

Automation of Curing Processe of Steel Cord Truck Tires – Medveditskov S.I., Filipovets R.О., Marshin I.V. (P. 42)

The system of controlling for process of vulcanization of steel cord truck tires in hydraulic presses 6475 НР, vulcanizing presses LLY 1665 х 580 х 2А, shaper-vulcanizers FV-1- 600 (75”), and FV-1-500 (75”) has been designed and implemented. The system of controlling of tire curing process operates off-line automatically by means of a specialized software. It based on wide spread bus-modular automation systems, built on the platform PXI (National Instruments) and tires VMEbus (Motorola), Multibus (Intel) and VXI (expansion of VME). The system includes control channels: the pressure in vapor chamber of the shaper-vulcanizer, the pressure in the bladder of shaper-vulcanizer and temperature in the vapor chamber of shaper-vulcanizer. The developed program optimizes modes of tire curing time, curing temperature and pressure in the mould. Its application provides the possibility to improve the quality of tires and reduce the number of defective products. To regulate the process of curing in the concrete cases the coefficients of proportional gain controller are experimentally determined. Detailed description of the process of the use of the system is presented.

Key words: tire, vulcanization, automation, software module controller.

Some Words on “Patent Power” – Busarev G.G. (P. 46)

With the use of some examples of patents the main role of patent formula was under consideration and recommendation on the right and save formulation of patent formula were presented.

Key words: patent, patent formula

Specific Features of Properties of Blends of Rubber Based on Organic Oxides and Polysilicones – Rumyantseva A.V., Glushak M.I., Klochkov V.I., Kurlyand S.K. (P. 48)

Blends of rubber based on polypropylene oxide GPO Т-6000 and different polysilicones have been studied by IR-spectroscopy mechanical analyzer RPA-2000, dielectric spectroscopy and DSC. Oxide- and silicone- based rubbers with various functionalities at silicon atom were shown to be compatible in any proportions. The use of even small amount of silicone rubber SKTV results in decrease of viscosity and dynamic storage modulus because of destruction of GPO. Introduction of Aerosil А-330 results in elimination of destruction. However there is no destruction in the case of the use of the other types of polysilicones (SKTFT, SKTFV, SKTE). Carbon black П-324 is recommended for GPO based technical rubber with 5 phr of SKTV instead of dibutyl phthalate. There is decrease of glass transition temperature from –120 to –130˚С and crystallization rate of SKTV in the blends. Physical and mechanical properties of all blends are satisfactory and even improved in some cases

Key words: propylene oxide rubber, silicone rubbers, viscosity, glass transition temperature, crystallization rate, physical and mechanical properties, IR-spectroscopy, RPA-2000, dielectric spectroscopy, DSC.

Specific Features of Stress-Strain Properties of NBR and GPO Degraded Gums – Suzdaltseva E.S., Rumyntseva A.V., Klochkov V.I., Kurlyand S.K. (P. 50)

Plasticizisation and second vulcanization of non filled vulcanized elastomers based on NBR (BNKS-18AM, BNKS-28AM, BNKS-40AM) and GPO Т-6000 have been studied. Second vulcanization was under the same conditions as the first one. Increase of plasticization time of elastomers based on BNKS-18AM and BNKS-28AM at first is resulted in the decrease of mechanical properties of secondary vulcanizates, further increase of the plasticization time results in their sufficient increase. In the case of BNKS-40AM and GPO Т-6000 there is no such increase. No chemical changes after plasticization was shown in IR spectra of all specimen. Introduction of 30% of plasticized rubber based on Т-6000 in fresh rubber compound is resulted in improvement of processing properties. Mechanical ones are on the same level.

Key words: NBR, GPO plasticization, second vulcanization, degradation, mechanical properties, IR spectra

Oligomers – Morozov Yu.L.,Chalykh A.E. (P. 52)

Review of papers presented on the V International Conference-School on Physics an Physical Chemistry of Oligomers (01 – 06.06.15., Volgograd)

Key words: new oligomers, kinetics, thermodynamics, functional groups, nanotechnology, ecology, electronics, polymers, polymers degradation, combustibility, methods

Contemporary Methods and Tools for Measurements, Tests, and Quality Control of Materials and Goods (P. 56)

Information about Seminar “Contemporary methods and tools for measurements, tests, and quality control of materials and goods” hold by company group Zwick/Roell (20 – 21.05.15., Saint Petersburg.)

Key words: methods of measurements, tools for measurements, mechanical properties of rubber compounds, vulcanized rubber and rubber goods