Enhancement of aging resistance of EPDM rubber by natural rubber‐ g ‐N (4‐phenylenediamine) maleimide as a grafted antioxidant

2021 ◽  
Author(s):  
Abd El‐Aziz A. El‐Wakil ◽  
Soma El‐Mogy ◽  
Sawsan F. Halim ◽  
Ahmed Abdel‐Hakim
Keyword(s):  
Natural Rubber ◽  
Epdm Rubber ◽  
Aging Resistance

Synthesis of sulphonic lanthanum complex based on C-methylcalix[4]resorcinarene and its thermo-oxidative aging resistance for natural rubber

2017 ◽  
Vol 46 (6) ◽  
pp. 251-257
Author(s):  
Hongqiang Li ◽  
Yong Zhong ◽  
Lin Zhang ◽  
Wenjian Wu ◽  
Xuejun Lai ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Oxidative Aging ◽  
Aging Resistance ◽  
Lanthanum Complex

Preparation and Properties of Acidified Prevulcanized Natural Rubber Latex

2014 ◽  
Vol 997 ◽  
pp. 239-242
Author(s):  
Guang Lu ◽  
He Ping Yu ◽  
Yong Zhou Wang ◽  
Yong Yue Luo ◽  
Zong Qiang Zeng
Keyword(s):  
Tensile Strength ◽  
Acetic Acid ◽  
Natural Rubber ◽  
Acid Content ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Elongation At Break ◽  
Acetic Acid Content ◽  
Hot Air ◽  
Aging Resistance

After a maturation of three days at ambient temperature, the sulfur-prevulcanized natural rubber latex (SNRL) was stabilized by 20wt% Peregal O, and then acidified with the 36wt% acetic acid by a ratio of 5, 15, 25, 35 and 45 g of 36wt% acetic acid to 100g SNRL, to obtain acidified prevulcanized NR latex (ASNRL) with different acidity, respectively. The viscosity of ASNRL increased, while the nitrogen content decreased, with the increment of acetic acid content and the decrease in pH; for unaged samples, the tensile strength, elongation at break, 300% and 500% moduli of the ASNRL films were only slightly lower than those of SNRL film; however the hot-air aging resistance decreased with the increment of acetic acid content.

HXNBR Coating for Improving Aging Resistance of Natural Rubber Products

2006 ◽  
Vol 79 (4) ◽  
pp. 553-560 ◽  
Author(s):  
Rani Joseph
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Room Temperature ◽  
Oxidative Degradation ◽  
Thin Coating ◽  
Oil Resistance ◽  
Aging Resistance ◽  
Natural Rubber Vulcanizates ◽  
Good Heat ◽  
Accelerator System

Abstract HXNBR (Hydrogenated Carboxylated Nitrile Rubber) has very good heat ageing resistance and oil resistance. A novel accelerator system is designed to bring about the vulcanization of HXNBR at room temperature. The room temperature cured samples showed good mechanical properties equivalent to those of high (150 °C) temperature cured samples. Natural rubber vulcanizates are highly prone to oxidative and ozone degradation. The oil resistance of natural rubber vulcanizates is also very low. The oil resistance, ozone and oxidative degradation resistance of natural rubber vulcanizates are considerably improved by placing a thin coating of HXNBR over it.

The Heat Aging of Natural Rubber Vulcanized with Tetramethylthiuram Disulfide

1958 ◽  
Vol 31 (2) ◽  
pp. 327-328 ◽  
Author(s):  
W. P. Fletcher ◽  
S. G. Fogg
Keyword(s):  
Natural Rubber ◽  
Heat Resistance ◽  
Major Part ◽  
Aging Behavior ◽  
Tetramethylthiuram Disulfide ◽  
Acetone Extraction ◽  
Aging Resistance

Abstract Acetone extraction of the TMTD stock, which is known to remove the ZnDMDC formed during vulcanization, also leads to a reduction in heat aging resistance. Addition to the extracted vulcanizate of the appropriate quantity of ZnDMDC from a solution improves the aging behavior although not to the level of the untreated vulcanizate. This failure to restore in full the aging resistance of the initial stock by swelling in the appropriate quantity of ZnDMDC is hardly surprising since it is likely that the ZnDMDC will be present in the original and in the dosed vulcanizate in somewhat different physical forms and distributions. The results demonstrate that the dithiocarbamate formed in situ during TMTD vulcanization plays a major part in conferring heat resistance to such vulcanizates.

Mechanical properties, chemical and aging resistance of natural rubber filled with nano-Al2 O3

2012 ◽  
Vol 33 (3) ◽  
pp. 404-411 ◽  
Author(s):  
Ji-Fang Fu ◽  
Li-Ya Chen ◽  
Hui Yang ◽  
Qing-Dong Zhong ◽  
Li-Yi Shi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Aging Resistance

New Accelerators for Vulcanization of Rubber—Part III: Synthesis, Characterization, and Evaluation of Some 2-Mercaptobenzimidazole Derivatives

1985 ◽  
Vol 58 (4) ◽  
pp. 713-727 ◽  
Author(s):  
D. Pal ◽  
A. Khamrai ◽  
B. Adhikari ◽  
T. Dutta ◽  
Mrinal M. Maiti ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Antioxidant Properties ◽  
Antioxidant Compounds ◽  
Dual Function ◽  
Cure Characteristics ◽  
Aging Resistance ◽  
Rubber Part ◽  
Derivatives Of ◽  
Better Than

Abstract Five derivatives of 2-mercaptobenzimidazole containing S—N bonds have been synthesized and evaluated for their action as accelerator-antioxidant in NR gum stocks. All these compounds exhibit varying degree of accelerating efficiency; some of them, viz. MBSTP, MBSPT, and MBDSPT, offer excellent cure characteristics and vulcanizate properties comparable to some of the best commercially available curatives such as CPTD. Substitution at the N or S atom of the MB molecule does not affect adversely its antioxidant properties; rather, an improvement in aging resistance has been achieved. The degree and nature of substitution play an important role in the antioxidation properties of these MB derivatives. Thus, disubstitution offers better antioxidation characteristics than monosubstitution, and the latter, in turn, is better than unsubstituted MB. Some discussion on correlation of reactivities of these MB derivatives and their cure synergism with CPTD have been reported. It was observed that these new accelerator—antioxidant compounds show very little cure synergism with CPTD but do show promise as dual-function curatives for natural rubber.

scholarly journals Properties of Natural Rubber-Based Composites Containing Fullerene

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Omar A. Al-Hartomy ◽  
Ahmed A. Al-Ghamdi ◽  
Falleh Al-Salamy ◽  
Nikolay Dishovsky ◽  
Desislava Slavcheva ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Dielectric Properties ◽  
Natural Rubber ◽  
Elastomeric Matrix ◽  
Transmission Electron ◽  
Aging Resistance ◽  
Filler Dispersion ◽  
Scanning Electron

In this study the influence of fullerenes in concentrations from 0.5 to 1.5 phr on both the vulcanization characteristics of the compounds and physicomechanical, dynamic, and dielectric properties and thermal aging resistance of nanocomposites on the basis of natural rubber has been investigated. The effect of the filler dispersion in the elastomeric matrix has been also investigated. Neat fullerene and the composites comprising it have been studied and characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).

Effect of Carbon Black Substitution with Raw and Modified Bentonite on the Thermal Aging Resistance of Natural Rubber Composites

2016 ◽  
Vol 705 ◽  
pp. 8-13 ◽  
Author(s):  
Clare L. Garing ◽  
Bryan B. Pajarito
Keyword(s):  
Carbon Black ◽  
Natural Rubber ◽  
Tensile Properties ◽  
Thermal Aging ◽  
Clay Platelet ◽  
Aging Resistance ◽  
Contour Plots ◽  
Activated Bentonite ◽  
Simplex Lattice ◽  
Simplex Lattice Mixture Design

The effect of carbon black (CB) substitution with raw (BNT) and modified (M-BNT) bentonite on the thermal aging resistance of natural rubber (NR) composites was investigated in this study. NR composites were prepared at varied proportions of CB, M-BNT, and BNT using a three-component, third degree simplex lattice mixture design of experiment (DOE). M-BNT was produced by modifying sodium-activated bentonite with tetradecyldimethylamine (TDA) salt and cocamide diethanolamine (CDEA). Thermal aging was performed at 70 and 100°C for 168 and 336 h. Substitution of CB with 5 phr M-BNT gave the highest values of tensile properties (modulus and strength) for both unaged and aged samples. This is attributed to the synergistic effect of CB and M-BNT fillers on the tensile properties of NR composites. In terms of property retention (%), composites filled with M-BNT and BNT clay fillers attained the highest values which signified their excellent thermal aging resistance. This observation proves the barrier effect of clay platelet structure which hinders oxygen diffusion in the rubber. Reduced hierarchical models as function of CB, M-BNT, and BNT proportions were used to generate contour plots for tensile properties of NR composites after 168 h of aging at 70 and 100°C.

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