the influence of accelerators on epdm vulcanizate in nigeria
The Influence of Accelerators on EPDM Vulcanizate
The stability of the basic accelerator nucleus is influential both on cure rate and on the ability to generate stable crosslinks. 7. The exact structure and concentration of the olefinic moieties present in the polymer have at least as much bearing on the detailed outcome of the vulcanization process as do changes in accelerator.
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Influence of nanoclay on adhesion of EPDM vulcanizate
In this paper, we have reported in details, probably for the first time, influence of Cloisite Na + on adhesion behavior of EPDM vulcanizate to unvulcanized EPDM vulcanizate. EPDM has been compounded using different concentrations of Cloisite Na + and co-cured with cured EPDM vulcanizate. The bulk and surface morphology of the nanocomposites formed have been examined by means of wide angle X-ray scattering (WXRD), transmission electron microscopy (TEM) and atomic force microscopy (AFM).
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Influence of nanoclay on adhesion of EPDM vulcanizate
EPDM is wrapped on the surface of the grain layer by layer via an adhesive; thus, the adhesive property between EPDM films is one of the key factors that influence the structural integrity of an SRM.
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Influence of nanoclay on adhesion of EPDM vulcanizate
Influence of nanoclay on adhesion of EPDM vulcanizate The rubber showed improvement in peel strength with increasing clay concentration up to 4 phr, beyond which it decreased. A maximum of 51% improvement in peel strength was obtained for 4 phr Cloisite Na + .
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Influence of accelerator type on properties of NR/EPDM
Blends of natural rubber (NR) and ethylene-propylene diene monomer (EPDM) have gained much attention over the past three decades because it is thought that, when properly blended, the NR/EPDM blend could possess good physical properties with adequately high aging and ozone resistance , , , .
Send InquiryThermal analysis applied to studying the influence
Activators and accelerators affect the parameters of vulcanization, such as temperature and time, as well as the safety of elastomer composite processing and the amount of sulfur needed to achieve the cross-linked structure of the vulcanizate . The type of accelerator, its amount and the ratio of the accelerator to sulfur content have crucial impacts on the final properties of the rubber products, especially thermal and thermo-oxidative stability, and some mechanical and dynamic properties ...
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The Versatile Elastomer - LANXESS
Plasticizers: In EPDM, processing oils are used to adjust the hardness and mod- ulus of the vulcanizate and to improve the flow behavior and extru- sion properties. Normally paraffinic mineral oils and also, if neces- sary, naphthenic mineral oils are used to plasticize EPDM com- pounds.
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“Fundamentals of Curing Elastomers with Peroxides
the desired physical properties of the final vulcanizate. Peroxides are capable of vulcanizing most polymer types, including standard unsaturated and saturated elastomer grades, fluoroelastomers, and silicones. The use of coagents synergistically with peroxides helps expand the utility of this vulcanization process.
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RAW MATERIALS AND COMPUNDS IN RUBBER INDUSTRY
Ethylene-propylene-diene rubber (EPDM) and its saturated counterpart EPM are very durable rubbers. EPM can only be vulcanized with peroxides as it is fully saturated. EPDM has an unsaturation in the side chain giving it a very good aging resistance. Butyl rubber (IIR) is a specialty rubber that is used in inner tubes because of its low gas
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Vulcanization & Accelerators
The basic accelerators such as Guanidines, Thiurams, are used as Secondary and Dithiocarbamates etc accelerators to activate the primary accelerators. The use of secondary accelerators increases the speed of vulcanization substantially but at the expense of scorch safety.
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Vulcanization & Accelerators
The vulcanizates thus produced are extremely prone to oxidative degradation and do not possessThe structure of speciality elastomers EPDM and Butyl had to be chemically modified to make sulfurAccelerators are also classified as Primary and / or Secondary accelerators based on the role they
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The Influence of TMPT Coagent on the Cross-link Density
Influence of the Curing System on the Properties of Thermoplastic Vulcanized EPDM / Plasticized PVC.In this paper were investigated influences of various types and concentrations of crosslinking agents on the properties of thermoplastic vulcanizates based on ethylene-propylene terpolymer
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Influence of the sulfur-accelerator-system on the properties
In addition, the influence of the curing system and other compound ingredients on material morphology and thus on the material properties are investigated.Sulfur cured conventional vulcanizates from EPDM and the disperse elastomer phase of dynamic vulcanizates from PP and EPDM were
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Curing characteristics, mechanical and thermal
based on natural rubber/recycled EPDM (ethylene-propylene-diene monomer). Presented results confirmed the significant influence of vulcanizing system (especially type of vulcanization accelerator) on curing characteristics, mechanical and thermal properties of the obtained vulcanizates.
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Scilit | Article - Influence of nanoclay on adhesion of EPDM vulcanizate
Influence of nanoclay on adhesion of EPDM vulcanizate. Ganesh C. Basak, Abhijit Bandyopadhyay, Anil K. Bhowmick.
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Influence of Filler from a Renewable Resource and Silane Coupling
Influences of the two types of RHA, namely, black rice husk ash (BRHA, silica content of 54%) andNo improvement was found in the mechanical properties of RHA filled vulcanizates with the silaneThe 1,3-diphenylguanidine (DPG) used as an secondary accelerator was manufactured by Evonik
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Influence of the Diene Monomer on Devulcanization of EPDM Rubber
Ethylene–propylene–diene rubbers (EPDM) with 2-ethylidene-5-norbornene (ENB), dicyclopentadiene (DCPD), and 1,4-hexadiene (HD) as third monomers have beenThe behavior of these vulcanizates during pure thermal devulcanization depends on the EPDM third monomer and the crosslinker used.
Send InquiryVulcanization - an overview | ScienceDirect Topics
The choice of accelerator will influence the length of crosslinks, but this can be further controlled by adjusting the accelerator:sulfur ratio.which in turn will reduce the solubility of the sulfurating reagent, consequent drop in sulfurating agent activity, and resultant drop in vulcanizate properties.
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Vulcanizates - Big Chemical Encyclopedia
EPM/EPDM vulcanizates have an excellent resistance to chemicals, such as dilute acids, alkaUes, alcohol, etc. This is in contrast to the resistance to aUphatic, aromatic, or chlorinated hydrocarbons. EPM/EPDM vulcanizates swell considerably in these nonpolar media.
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Vulcanization
During vulcanization, some of these C-H bonds are replaced by chains of sulfur atoms that link with a cure site of another polymer chain. These bridges contain between one and several atoms. The number of sulfur atoms in the crosslink strongly influences the physical properties of the final rubber article.
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