Effects of Blend Ratio and SBR Type on Properties of Carbon Black-Filled and Silica-Filled SBR/BR Tire Tread Compounds

Pongdhorn Sae-Oui,Krisda Suchiva,Uthai Thepsuwan,Pram Yodjun,Wenussarin Intiya,Chakrit Sirisinha

doi:10.1155/2017/2476101

Abstract

This work aimed at investigating the effects of blend ratio between styrene butadiene rubber (SBR) and butadiene rubber (BR) and SBR type (E-SBR and S-SBR) on properties of SBR/BR tire tread compounds. Influences of these parameters on properties of the tread compounds reinforced by 80 parts per hundred rubber (phr) of carbon black (CB) and silica were also compared. Results reveal that hardness, strengths, and wet grip efficiency were impaired whereas rolling resistance was improved with increasing BR proportion. Surprisingly, the presence of BR imparted poorer abrasion resistance in most systems, except for the CB-filled E-SBR system in which an enhanced abrasion resistance was observed. Obviously, S-SBR gave superior properties (tire performance) compared to E-SBR, particularly obvious in the silica-filled system. Compared with CB, silica gave comparable strengths, better wet grip efficiency, and lower rolling resistance. Carbon black, however, offered greater abrasion resistance than silica.

Highlights

It is widely known that tire performance is justified by three main properties, that is, rolling resistance, wet grip efficiency, and abrasion resistance
Compound viscosity decreases with increasing butadiene rubber (BR) content in the blends because BR used in this work has lower viscosity than E-styrene butadiene rubber (SBR) and solutionpolymerized SBR (S-SBR), respectively
At any given blend ratio, S-SBR/BR blends show slightly higher viscosity than emulsion-polymerized SBR (E-SBR)/BR blends which is attributed to the higher initial viscosity of S-SBR

Summary

Introduction

It is widely known that tire performance is justified by three main properties, that is, rolling resistance, wet grip efficiency, and abrasion resistance. Many attempts have successively been made to investigate parameters affecting properties of tire tread compound with the goal of achieving improvements of both rolling resistance and wet grip efficiency of tire [1,2,3,4,5,6,7,8,9,10,11,12]. Previous works have shown that rolling resistance and wet grip efficiency are closely related to dynamic viscoelastic behavior of tread compound and can be represented by the ratio of loss modulus to storage modulus (tan δ) at high temperature (∼60∘C) and low temperature (∼0∘C), respectively [8, 9, 13,14,15,16,17]

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Results

Conclusion