PASSENGER TYRE

S. Agrawal, S. Mandot, N. Mandal, S. Bandyopadhyay, R. Mukhopadhyay, A.S. Deuri, R. Mallik, and A.K. Bhowmick, Effect of Com Powder as filler in radial passenger tyre tread compound, Journal of Material Science, 41, 5657, 2006. 

Standardisation of EPDM characterisation tests (molecular composition, stabiliser and oil content) for QC and specification purposes was reported [64,65]. Infrared spectroscopy (rather than HPLC or photometry) is recommended for the determination of the stabiliser content (hindered phenol type) of EP(D)M [65]. Determination of the oil content of oil-extended EPDM is best carried out by Soxhlet extraction using MEK as a solvent [66], A round robin test was reported that evaluated the various techniques currently used in the investigation of unknown rubber compounds (passenger tyre tread stock formulations) [67]. 

Following this scheme, Coz and Baranwal [80] have reported the reverse engineering of four unknown cured rubber compounds, representing a radial passenger tyre tread, a radiator hose, an oil pan seal and an engine gasket. 

A variety of synthetic rubbers are commercially used styrene-butadiene rubber (SBR), polybutadiene, ethylene-propylene rubber, butyl and halobutyl rubber, etc. The most important is SBR, which is mainly used as a major component of all passenger tyres and in significant amounts in most tyre products. 

Component Passenger tyres Commercial vehicle tyres... 

After the war when natural rubber became available again the consumption of styrene-butadiene rubber began to fall however, the trend was reversed in 1949 with the advent of a copolymer made at low temperature. This product gives a passenger-tyre rubber superior to natural rubber and styrene-butadiene rubbers have remained the most important of the large-tonnage rubbers. With the ever-increasing world consumption of rubbers, the output of styrene-butadiene rubbers has more than doubled since World War II (Table 18.2). 

Although direct analysis of rubber compounds yields simultaneously information about polymer and additives, a quantitative determination of the additives is difficult. This requires separation of these components from the polymer and fillers by means of extraction. Following the standard procedure at Akron Rubber (cfr Chp. 2.2 of ref. [3a]), Coz et al. [25] have examined four unknown cured rubber compounds (radial passenger tyre tread, radiator hose, oil pan seal and engine gasket). Tables 6.7 and 6.8 compare the reconstructed formulations and actual recipes for the tyre and radiator hose. 

Figure 5.1 Passenger tyre carcasses retreaded with compounds containing 5-30% DevulCOi rubber prior to moulding. Reproduced with permission from the DevulCOi Research Project Consortium (Lead Partner Smithers Rapra, Shawbury, UK), UK. 2012, DevulCOi...

Figure 12.5 Patches of Passenger Tyre Tread (PTT) rubber compound removed from...

A typical formulation for a passenger tyre tread is shown in Table 37. To raise the curing temperature, the use of antireversion chemical, Perkalink 900 has been recommended (119). 

A passenger tyre carcass formulation is shown in Table 45. In this application, adhesion to fibres is a consideration. The cure system suitable for this application is based on TBBS/MBTS/IS. 

The effect of the above compound (Perkalink 900), as an anti-reversion agent, in a passenger tyre tread based on SBR/BR blends was investigated with the aim of increasing cure temp, such that cure times can be reduced, thus improving productivity. It was found that this compound reacted by scavenging dienes and trienes in the reverted network, thereby compensating for a reduced level of sulphidic crosslinks observed at increased cure temps. It did not affect compound cure characteristics or compound viscosity. 15 refs. 

Manchester, 7th-10th June 1999, Materials paper 10. HIGH TEMPERATURE CURING OF PASSENGER TYRES BY USING 1,3 BIS-(CITRACONIMIDOMETHYL) BENZENE... 

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