Reactives Mischen, Verstärken und Vernetzen von NR/BR/EPDM für Reifenseitenwände

Translated title of the contribution: Reactive blending, reinforcement and curing of NR/BR/EPDM compounds for tire sidewall applications

K. Sahakaro, N. Naskar, R.N. Datta, J.W.M. Noordermeer

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Tyre sidewall compounds are generally formulated using NR and BR to achieve the required dynamical properties. The most widely used antiozonant, N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environmentally harmful substance. Incorporation of EPDM into NR/BR blends improves ozone resistance, but leads to poor properties because of differences in filler affinity and cure incompatibility of the rubber components. In this work, the cure incompatibility is overcome by utilising a reactive processing technique, making use of the most commonly used accelerator CBS and sulfur. The entire amount of curatives is first added into the EPDM. After a thermal pretreatment step related to the scorch time of the EPDM, the modified EPDM is mixed with pre-blended NR/BR. The reactive blends show significant improvements of physical properties in comparison with those of conventional straight mixes, due to improvement of the crosslink and carbon black distributions, confirmed by AFM and TEM images. The physical properties of the reactive mixed NR/BR/EPDM blends are equivalent or even superior to regular filled NR/BR blends for tyre sidewall applications. The blend with 30 phr of EPDM has excellent ozone resistance while 6PPD can be totally omitted from the formulation.
Original languageGerman
Pages (from-to)163-176
JournalGummi, Fasern, Kunststoffe
Volume61
Issue number3
Publication statusPublished - 2008

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Ozone resistance
Tires
Curing
Reinforcement
Physical properties
Soot
Poisons
Rubber
Carbon black
Sulfur
Particle accelerators
Fillers
Transmission electron microscopy
Processing

Cite this

@article{095f0c66ef0749a1882f197adbd0cc4d,
title = "Reactives Mischen, Verst{\"a}rken und Vernetzen von NR/BR/EPDM f{\"u}r Reifenseitenw{\"a}nde",
abstract = "Tyre sidewall compounds are generally formulated using NR and BR to achieve the required dynamical properties. The most widely used antiozonant, N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environmentally harmful substance. Incorporation of EPDM into NR/BR blends improves ozone resistance, but leads to poor properties because of differences in filler affinity and cure incompatibility of the rubber components. In this work, the cure incompatibility is overcome by utilising a reactive processing technique, making use of the most commonly used accelerator CBS and sulfur. The entire amount of curatives is first added into the EPDM. After a thermal pretreatment step related to the scorch time of the EPDM, the modified EPDM is mixed with pre-blended NR/BR. The reactive blends show significant improvements of physical properties in comparison with those of conventional straight mixes, due to improvement of the crosslink and carbon black distributions, confirmed by AFM and TEM images. The physical properties of the reactive mixed NR/BR/EPDM blends are equivalent or even superior to regular filled NR/BR blends for tyre sidewall applications. The blend with 30 phr of EPDM has excellent ozone resistance while 6PPD can be totally omitted from the formulation.",
author = "K. Sahakaro and N. Naskar and R.N. Datta and J.W.M. Noordermeer",
year = "2008",
language = "German",
volume = "61",
pages = "163--176",
journal = "Gummi, Fasern, Kunststoffe",
issn = "0176-1625",
publisher = "Dr. Gupta Verlag",
number = "3",

}

Reactives Mischen, Verstärken und Vernetzen von NR/BR/EPDM für Reifenseitenwände. / Sahakaro, K.; Naskar, N.; Datta, R.N.; Noordermeer, J.W.M.

In: Gummi, Fasern, Kunststoffe, Vol. 61, No. 3, 2008, p. 163-176.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Reactives Mischen, Verstärken und Vernetzen von NR/BR/EPDM für Reifenseitenwände

AU - Sahakaro, K.

AU - Naskar, N.

AU - Datta, R.N.

AU - Noordermeer, J.W.M.

PY - 2008

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N2 - Tyre sidewall compounds are generally formulated using NR and BR to achieve the required dynamical properties. The most widely used antiozonant, N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environmentally harmful substance. Incorporation of EPDM into NR/BR blends improves ozone resistance, but leads to poor properties because of differences in filler affinity and cure incompatibility of the rubber components. In this work, the cure incompatibility is overcome by utilising a reactive processing technique, making use of the most commonly used accelerator CBS and sulfur. The entire amount of curatives is first added into the EPDM. After a thermal pretreatment step related to the scorch time of the EPDM, the modified EPDM is mixed with pre-blended NR/BR. The reactive blends show significant improvements of physical properties in comparison with those of conventional straight mixes, due to improvement of the crosslink and carbon black distributions, confirmed by AFM and TEM images. The physical properties of the reactive mixed NR/BR/EPDM blends are equivalent or even superior to regular filled NR/BR blends for tyre sidewall applications. The blend with 30 phr of EPDM has excellent ozone resistance while 6PPD can be totally omitted from the formulation.

AB - Tyre sidewall compounds are generally formulated using NR and BR to achieve the required dynamical properties. The most widely used antiozonant, N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine (6PPD), is a staining, toxic and environmentally harmful substance. Incorporation of EPDM into NR/BR blends improves ozone resistance, but leads to poor properties because of differences in filler affinity and cure incompatibility of the rubber components. In this work, the cure incompatibility is overcome by utilising a reactive processing technique, making use of the most commonly used accelerator CBS and sulfur. The entire amount of curatives is first added into the EPDM. After a thermal pretreatment step related to the scorch time of the EPDM, the modified EPDM is mixed with pre-blended NR/BR. The reactive blends show significant improvements of physical properties in comparison with those of conventional straight mixes, due to improvement of the crosslink and carbon black distributions, confirmed by AFM and TEM images. The physical properties of the reactive mixed NR/BR/EPDM blends are equivalent or even superior to regular filled NR/BR blends for tyre sidewall applications. The blend with 30 phr of EPDM has excellent ozone resistance while 6PPD can be totally omitted from the formulation.

M3 - Article

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