Development of Frost-Resistant Rubber Based on Epichlorohydrin Rubber of Hydrin T6000 Brand

2019 ◽  
Vol 945 ◽  
pp. 356-361 ◽  
Author(s):  
A.R. Haldeeva ◽  
M.L. Davydova ◽  
M.D. Sokolova
Keyword(s):  
Main Chain ◽  
Residual Deformation ◽  
Physical And Mechanical Properties ◽  
Cold Climate ◽  
Oil Resistance ◽  
Equipment Operation ◽  
Resistant Rubber ◽  
Resistance To Heat ◽  
Ozone Resistance ◽  
Hydrocarbon Media

The results of development of frost-resistant rubber based on epichlorohydrin rubber (ECHR) of Hydrin T6000 brand of Zeon Chemicals L.P. (USA) are described in the present work. The properties of ECHRs are determined by the nature of the structural units that constitute the macromolecules. The absence of olefinic functionality in the main chain gives ECHR the resistance to heat, oxygen, ozone and other factors. The presence of chlorine causes the high resistance of Hydrin T6000 rubber to the effect of hydrocarbon media (oils, fuels, fats, waxes, solvents), and the presence of oxygen atoms helps to maintain the flexibility and elasticity of materials at low temperatures. Hydrin T6000 rubber has the lowest glass transition temperature (Tgt= -60 ° C) from all the epichlorohydrin rubber brands, high oil resistance, increased heat and ozone resistance, and, therefore, attracts researchers' interest as a promising rubber for the development of frost-resistant rubber with sealing capability. The paper presents the formulation of rubbers based on Hydrin T6000 and the results of studies of their physical and mechanical properties. Analysis of the data revealed that the obtained rubber has excellent frost resistance, increased oil resistance at a satisfactory level of residual deformation after compression and strength characteristics. Thus, Hydrin T6000 has established itself as a promising rubber for manufacturing frost-resistant rubber with sealing function and will provide increased reliability and durability of equipment operation in extreme conditions of cold climate in Russia.

Novel modification of styrene butadiene rubber/acrylic rubber blends to improve mechanical, dynamic mechanical, and swelling behavior for oil sealing applications

2021 ◽  
pp. 096739112110313
Author(s):  
Ahmed Abdel-Hakim ◽  
Soma A el-Mogy ◽  
Ahmed I Abou-Kandil
Keyword(s):  
Mechanical Properties ◽  
Crosslink Density ◽  
Physical And Mechanical Properties ◽  
Dynamic Mechanical Properties ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Rubber Blends ◽  
Dynamic Mechanical ◽  
Oil Resistance ◽  
Styrene Butadiene

Blending of rubber is an important route to modify properties of individual elastomeric components in order to obtain optimum chemical, physical, and mechanical properties. In this study, a novel modification of styrene butadiene rubber (SBR) is made by employing acrylic rubber (ACM) to obtain blends of outstanding mechanical, dynamic, and oil resistance properties. In order to achieve those properties, we used a unique vulcanizing system that improves the crosslink density between both polymers and enhances the dynamic mechanical properties as well as its resistance to both motor and break oils. Static mechanical measurements, tensile strength, elongation at break, and hardness are improved together with dynamic mechanical properties investigated using dynamic mechanical analyses. We also proposed a mechanism for the improvement of crosslink density and consequently oil resistance properties. This opens new opportunities for using SBR/ACM blends in oil sealing applications that requires rigorous mechanical and dynamic mechanical properties.

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.

Influence of 6PPD Stabilizer on Climatic Stability of Rubbers Based on Butadiene-Nitrile and Epichlorohydrin Rubbers

2019 ◽  
Vol 945 ◽  
pp. 433-437
Author(s):  
M.D. Sokolova ◽  
A.F. Fedorova ◽  
M.L. Davydova
Keyword(s):  
Mechanical Properties ◽  
Physical And Mechanical Properties ◽  
Hydraulic Fluids ◽  
Open Ground ◽  
The Republic ◽  
The Stability ◽  
Property Changes ◽  
Full Scale Tests ◽  
Butadiene Nitrile Rubber ◽  
Hydrocarbon Media

The present paper outlines the results of full-scale tests of climatic stability and the study of resistance to the action of hydrocarbon media of rubbers based on BNKS-18-18 (butadiene-nitrile rubber) and Hydrin T6000 epichlorohydrin rubber containing one of 6PPDstabilizerwith an aromatic amine moiety widely used in synthetic rubbers. Samples are exposed in an open ground under natural conditions of exposure to climatic external factors of Yakutsk in the Republic of Sakha (Yakutia), as well as in the oil environment of Talakanskoye field and I-50A hydraulic fluid in an unheated room. Such indexes of the samples as conditional tensile strength, elongation at rupture, hardness and degree of swelling are measured to determine the resistance of rubbers to aging after the first, third, and sixth months of exposing. The results of the study reveal the contribution of 6PPD stabilizer in maintaining the stability of the physical and mechanical properties of BNKS-18: rubber containing 6PPD has less property changes both in the open air and in hydrocarbon media compared to rubber without a stabilizer. It should be noted that the oil environment is the most aggressive environment, the swelling of rubbers in oil leads to a significant reduction in strength due to a decrease in intermolecular interaction.6PPD stabilizer occurred less effective for the rubber based on Hydrin T6000: changes in properties of the samples containing the stabilizer are larger than those of the samples without the stabilizer. However, unlike BNKS-18-18-based rubber, the swelling of rubber based on Hydrin T6000 led to the greatest stability of the physical and mechanical properties in the oil environment compared to the open air and hydraulic fluids.

Mechanical Properties of Natural Rubber and Chloroprene Rubber Latex Blends

2011 ◽  
Vol 239-242 ◽  
pp. 1601-1604 ◽  
Author(s):  
Xiao Xue Liao ◽  
Hai Sheng Tan ◽  
Ming Chao Luo ◽  
Bing Tang ◽  
Shuang Quan Liao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Physical And Mechanical Properties ◽  
Epoxidized Natural Rubber ◽  
Latex Film ◽  
Rubber Latex ◽  
Oil Resistance ◽  
Chloroprene Rubber

The effects of the ratios of natural rubber latex (NRL)and chloroprene rubber latex(CRL) and the type of compatibilizer on physical and mechanical properties of latex film were researched.The oil resistance of vulcanized latex film was tested. The compatibility of the latex blends was also analyzed by TG/DTG method.The results showed that properties of latex film were best when ratio of NRL/CRL was 75/25. As the CRL content increased, oil resistance of latex film was improved. Epoxidized natural rubber latex improved compatibility of NRL and CRL blends.

Amelioration of the Porosity in Silicate Based Materials

2013 ◽  
Vol 688 ◽  
pp. 176-179
Author(s):  
Lenka Mészárosová ◽  
Rostislav Drochytka
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Heat Resistance ◽  
Thermal Insulation ◽  
Raw Materials ◽  
Basic Properties ◽  
Equipment Operation ◽  
Potential Applications ◽  
Resistance To Heat ◽  
Reduction Of Costs

This article deals with the application of lightweight concretes for thermal insulation purposes. The main aim is to increase their porosity, which is closely related to the thermal resistance of the substance. By selecting appropriate raw materials, we try to eliminate this imperfection and propose a material that would generate sufficient resistance to heat transfer to allow the reduction of costs associated with the insulated equipment operation, while preserving the heat resistance of such materials. The article outlines the designing of such material, its potential applications, advantages over existing materials, and some basic properties.

Nitrile-EPDM Polymer Blends Fundamental Considerations for Development of Key Properties

1977 ◽  
Vol 9 (3) ◽  
pp. 329-340 ◽  
Author(s):  
Julian M. Mitchell
Keyword(s):  
Carbon Black ◽  
Physical Properties ◽  
Polymer Blends ◽  
Important Influence ◽  
Polymer Composition ◽  
Dramatic Effect ◽  
Oil Resistance ◽  
Definite Effect ◽  
Low Levels ◽  
Ozone Resistance

The method of polymer-carbon black addition to the Banbury has a very definite effect on the development of the NBR-EPDM blend features. The conventional mix provides excellent dispersion, the best balance of properties and the best economics. The cure system has an important influence on the blend properties. Sulfur-accelerator cures designed for co-vulcanization of NBR-EPDM develop uniform physical properties through the entire blend range. Peroxide cures also provide uniform physical properties, better oil resistance and better ozone resistance at low levels of EPDM. The EPDM polymer composition has a dramatic effect on the blend properties. An EPDM polymer with equivalent viscosities and high unsaturation has good development of the essential blend properties. However, an EPDM polymer which is higher in viscosity and ethylene with normal unsaturation, the physical properties are constant through the entire blend range.

Co-Continuity and Ozone Resistance of Bims Compounds

2003 ◽  
Vol 76 (2) ◽  
pp. 318-325 ◽  
Author(s):  
Andy H. Tsou ◽  
Ilan Duvdevani ◽  
Kenneth O. McElrath
Keyword(s):  
General Purpose ◽  
The Other ◽  
Rubber Blend ◽  
Resistant Rubber ◽  
Phase Compatibility ◽  
Diene Rubbers ◽  
Ozone Resistance

Abstract A co-continuous blend of a high ozone resistant rubber with high diene rubbers, or with a mixture of high diene rubbers, can provide a rubber blend that is both ozone resistant and wear and scuff resistant. High diene rubbers have excellent wear and scuff resistances, but are prone to ozone damage. The high ozone resistant rubbers are rubbers that have saturated backbone after vulcanization, such as BIMS. However, depending on the co-continuous morphology, not all co-continuous blends of an ozone resistant rubber with other rubbers are ozone resistant. In this study, a co-continuity index was proposed to measure the co-continuity morphology of 50/50 BIMS/GPR blends. GPR represents a general-purpose rubber and is a mixture of NR and BR in this study. It was found that BIMS compounds having their co-continuity indices greater than 0.7 are ozone resistant. These ozone-resistant compounds were prepared by first adding GPR followed by adding small N351 CB fillers, as compared with the other large N660 CB used in this work. Thus, smaller CB filler first presence in GPR appears to enhance GPR/BIMS phase compatibility during mixing with later added BIMS leading to strong intermixing between co-continuous phases.

Metallurgical Effects of Grain Boundary Ledges

1977 ◽  
Vol 35 ◽  
pp. 126-129
Author(s):  
L.E. Murr
Keyword(s):  
Grain Boundary ◽  
Quantitative Data ◽  
Mechanical Treatment ◽  
Unit Length ◽  
Physical And Mechanical Properties ◽  
Direct Observations ◽  
Transmission Electron ◽  
Properties Of Materials ◽  
Thermo Mechanical Treatment ◽  
Ledge Density

Ledges in grain boundaries can be identified by their characteristic contrast features (straight, black-white lines) distinct from those of lattice dislocations, for example1,2 [see Fig. 1(a) and (b)]. Simple contrast rules as pointed out by Murr and Venkatesh2, can be established so that ledges may be recognized with come confidence, and the number of ledges per unit length of grain boundary (referred to as the ledge density, m) measured by direct observations in the transmission electron microscope. Such measurements can then give rise to quantitative data which can be used to provide evidence for the influence of ledges on the physical and mechanical properties of materials.It has been shown that ledge density can be systematically altered in some metals by thermo-mechanical treatment3,4.

Investigation of shock-wave deformation history from recovered structure

1986 ◽  
Vol 44 ◽  
pp. 434-435
Author(s):  
M.A. Mogilevsky ◽  
L.S. Bushnev
Keyword(s):  
Shock Wave ◽  
Plastic Deformation ◽  
Dislocation Density ◽  
Shock Waves ◽  
Shock Front ◽  
Single Crystals ◽  
Residual Deformation ◽  
Deformation Structure ◽  
Deformation History ◽  
Deformation Velocity

Single crystals of Al were loaded by 15 to 40 GPa shock waves at 77 K with a pulse duration of 1.0 to 0.5 μs and a residual deformation of ∼1%. The analysis of deformation structure peculiarities allows the deformation history to be re-established.After a 20 to 40 GPa loading the dislocation density in the recovered samples was about 1010 cm-2. By measuring the thickness of the 40 GPa shock front in Al, a plastic deformation velocity of 1.07 x 108 s-1 is obtained, from where the moving dislocation density at the front is 7 x 1010 cm-2. A very small part of dislocations moves during the whole time of compression, i.e. a total dislocation density at the front must be in excess of this value by one or two orders. Consequently, due to extremely high stresses, at the front there exists a very unstable structure which is rearranged later with a noticeable decrease in dislocation density.

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