scholarly journals The study of the possibility of using domestic burnt magnesia in oil and petrol resistant rubber

2019 ◽  
Vol 59 (7) ◽  
pp. 63-68
Author(s):  
Nikolay F. Ushmarin ◽  
◽  
Evgeny N. Egorov ◽  
Nikolay I. Kol'tsov ◽  
◽  
...  
Keyword(s):  
Magnesium Oxide ◽  
Residual Deformation ◽  
Rubber Matrix ◽  
Standard Samples ◽  
Start Time ◽  
Technical Grade ◽  
Rubber Mixture ◽  
Roll Mill ◽  
Resistant Rubber ◽  
Kinetics Of

The article examines the oil-and-petrol resistant rubber mixture of type 7NO-68-1SK based on the combination of BNKS-18AMN grade butadiene-caoutchouc with polychloroprene caoutchouc of brand neoprene W. The effect of replacing imported burnt magnesia brand Remag AC on domestic burnt magnesia technical grade B on the properties of the rubber compound and vulcanizate was studied. The rubber mixture was prepared on a laboratory roll mill LB 320 160/160, and then its standard samples were vulcanized at 150 °C for 30 minutes in a two-story electrically heated press of the VP 400-2E brand. To establish the plasto-elastic properties of rubber mixture on the Mooney viscometer, MV 3000 was determined: the start time of the vulcanization, the time to reach the vulcanization mode, the initial maximum viscosity. To assess the kinetics of vulcanization of the rubber mixture on the rheometer MDR 3000 was determined: the start time of vulcanization, the time to reach the optimum vulcanization, the maximum torque. To assess the physicomechanical properties of rubber, the following were determined: conditional tensile strength; elongation at break; hardness; tear resistance and relative residual deformation under compression in accordance with the standards in force in the rubber industry. To assess the performance properties of rubber, changes in its mass were determined after aging in a mixture of isooctane + toluene, as well as standard liquid SJR–1. It has been shown that the introduction of burnt magnesia technical grade B into the rubber mixture does not lead to technological complications, magnesia is well distributed in the rubber matrix, and the magnesia agglomerates were not found on the rubber mixture sections. Replacement magnesium oxide m. Remag AC on burnt magnesia technical grade B has an impact on the plasto-elastic and rheometric properties of the rubber mixture. However of physicomechanical and operational properties vulcanizates of rubber mixture containing magnesium oxide m. Remag AC and burnt magnesiatechnical grade B, have almost the same values.

scholarly journals THE INFLUENCE OF POWDER SHUNGYTES ON PROPERTIES OF OIL-AND BENZO RESISTANT RUBBERS

2018 ◽  
Vol 62 (1) ◽  
pp. 54-60
Author(s):  
Nikolay F. Ushmarin ◽  
Egor G. Efimovskii ◽  
Nina N. Petrova ◽  
Sergei I. Sandalov ◽  
Nikolay I. Kol'tsov
Keyword(s):  
Tensile Strength ◽  
Residual Deformation ◽  
Partial Replacement ◽  
Operational Parameters ◽  
Start Time ◽  
Rubber Mixture ◽  
Elongation At Break ◽  
Industrial Oil ◽  
Strength Change ◽  
Kinetics Of

In the article two rubber mixtures are studied: rubber 7NO-68-1SK based on a combination of butadiene-nitrile caoutchouc BNKS-18AMN with chloroprene caoutchouc neoprene W and rubber 81-453 based on a combination of butadiene-nitrile caoutchouc BNKS-40AMN, butadiene caoutchouc SKD, butadiene-methylstyrene caoutchouc SKMS-30 ARK and sevilene 11808-340. The purpose of the study was to improve the physical-mechanical and operational properties of both rubber mixtures by using fine powdered schungites Taurit TS-D, Psh-5 and PSH-20 in their composition. To assess the kinetics of vulcanization of rubber mixtures, the following were determined: the minimum and maximum torques; start time, optimum time, time achieving maximum vulcanization rate and maximum of vulcanization rate. To assess the physical-mechanical properties, we determined: the conditional tensile strength; elongation at break; hardness and relative residual deformation after compression. To evaluate the performance properties of rubbers, the following was determined: the change in the relative tensile strength; change in elongation at break and change in mass after aging of vulcanizates in a standard liquid SZHR-1, isooctane + toluene mixture, as well as in gasoline and industrial oil I-20A. It is shown that for the rubber mixture 7-NO-68-1SK a partial replacement of carbon blacks P 803 on the schungite PSH-5 in an amount of 15 parts by weight leads to an improvement in the rheometric parameters, physico-mechanical and operational properties of vulcanizates. For the rubber mixture 81-453, partial replacement of the persil 175 on shungite PSH-5 also allows improving the rheometric properties and increasing the physico-mechanical and operational parameters.

Kinetics of radiative recombination in magnesium oxide

1979 ◽  
Vol 20 (4) ◽  
pp. 1687-1699 ◽  
Author(s):  
R. T. Williams ◽  
J. W. Williams ◽  
Thomas J. Turner ◽  
K. H. Lee
Keyword(s):  
Magnesium Oxide ◽  
Radiative Recombination ◽  
Kinetics Of

scholarly journals Intrinsic kinetic study of 1-butene isomerization over magnesium oxide catalyst via a Berty stationary catalyst basket reactor

RSC Advances ◽  
2020 ◽  
Vol 10 (60) ◽  
pp. 36667-36677
Author(s):  
Khunnawat Ountaksinkul ◽  
Sippakorn Wannakao ◽  
Piyasan Praserthdam ◽  
Suttichai Assabumrungrat
Keyword(s):  
Magnesium Oxide ◽  
Oxide Catalyst ◽  
Internal Mass ◽  
Intrinsic Kinetics ◽  
Recycle Reactor ◽  
Mass Transfers ◽  
Intrinsic Kinetic ◽  
Kinetics Of ◽  
Stationary Catalyst ◽  
Butene Isomerization

The intrinsic kinetics of 1-butene isomerization over a commercial MgO catalyst was studied by using a Berty-type reactor (gradient-less recycle reactor) without limitations of heat-, external mass-, and internal mass-transfers.

scholarly journals The Effect of Halloysite Nanotubes on the Fire Retardancy Properties of Partially Biobased Polyamide 610

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3050
Author(s):  
David Marset ◽  
Celia Dolza ◽  
Eduardo Fages ◽  
Eloi Gonga ◽  
Oscar Gutiérrez ◽  
...  
Keyword(s):  
Optical Density ◽  
Flame Retardancy ◽  
Ignition Time ◽  
Characteristic Curve ◽  
Halloysite Nanotubes ◽  
Inorganic Filler ◽  
Standard Samples ◽  
Start Time ◽  
Twin Screw ◽  
Heat Released

The main objective of the work reported here was the analysis and evaluation of halloysite nanotubes (HNTs) as natural flame retardancy filler in partially biobased polyamide 610 (PA610), with 63% of carbon from natural sources. HNTs are naturally occurring clays with a nanotube-like shape. PA610 compounds containing 10%, 20%, and 30% HNT were obtained in a twin-screw co-rotating extruder. The resulting blends were injection molded to create standard samples for fire testing. The incorporation of the HNTs in the PA610 matrix leads to a reduction both in the optical density and a significant reduction in the number of toxic gases emitted during combustion. This improvement in fire properties is relevant in applications where fire safety is required. With regard to calorimetric cone results, the incorporation of 30% HNTs achieved a significant reduction in terms of the peak values obtained of the heat released rate (HRR), changing from 743 kW/m2 to about 580 kW/m2 and directly modifying the shape of the characteristic curve. This improvement in the heat released has produced a delay in the mass transfer of the volatile decomposition products, which are entrapped inside the HNTs’ lumen, making it difficult for the sample to burn. However, in relation to the ignition time of the samples (TTI), the incorporation of HNTs reduces the ignition start time about 20 s. The results indicate that it is possible to obtain polymer formulations with a high renewable content such as PA610, and a natural occurring inorganic filler in the form of a nanotube, i.e., HNTs, with good flame retardancy properties in terms of toxicity, optical density and UL94 test.

Effect of morphology on adsorption kinetics of magnesium oxide for the removal of methyl orange

2017 ◽  
Vol 98 ◽  
pp. 325-335
Author(s):  
Yong Liu ◽  
Ming Huang ◽  
Yaohui You ◽  
Donghai Zhu ◽  
Xiaojing Fu ◽  
...  
Keyword(s):  
Methyl Orange ◽  
Magnesium Oxide ◽  
Adsorption Kinetics ◽  
Kinetics Of

Effect of Austenite Deformation on Recrystallisation Behaviour in an X-70 Microalloyed Steel

2010 ◽  
Vol 89-91 ◽  
pp. 721-726 ◽  
Author(s):  
Lin Sun ◽  
Bradley P. Wynne ◽  
Eric J. Palmiere
Keyword(s):  
Microalloyed Steel ◽  
Pipeline Steel ◽  
Current Model ◽  
Compression Tests ◽  
Precipitation Kinetics ◽  
Start Time ◽  
Critical Temperatures ◽  
Softening Parameter ◽  
Fractional Softening ◽  
Kinetics Of

In the present study, the effect of austenite deformation on the recrystallisation behaviour in terms of recrystallisation-stop and recrystallisation-limit temperatures (T5% and T95%) of an X70 niobium microalloyed pipeline steel have been investigated by interrupted plane strain compression tests. The extents of recrystallisation are calculated using a modified fractional softening parameter. And the 20% and 60% of fractional softening were correlated to T5% and T95%. Quantitative optical metallography indicates that this method provides for a convenient and reliable experimental measurement of the critical temperatures associated with the recrystallisation of austenite. The recrystallisation kinetics and the precipitation kinetics of Nb(CN) were calculated using two widely applied models. The experimental results from this study suggest that the current model of precipitation kinetics might overestimate the precipitation start time.

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