Effect of Ratio of Methylene Donor/Resorcin-Formaldehyde Resin on Properties of Belt Compound in Steel-belted Radial Tire
The effect of the blend ratio of methylene donor HMMM and resorcinol-formaldehyde resin(referred to as RF resin)SL-3020LFR on the properties of belt compound in steel-belted radial tire was studied.The results showed that,with the increase of the HMMM/RF resin SL-3020LFR blend ratio,the Fmax-FL of the compound increased,and both the scorch time and vulcanization time tended to be prolonged.The modulus of the compound slightly increased,and the tensile strength and elongation at break of the compound decreased more after aging.At 60 ℃,the loss factor of the compound first increased and then decreased.After being aged in hot air,steam and salt spray,the extracted steel cord was free of copper leakage and the surface of the steel wire was coated with black compound.Overall,when the HMMM/RF resin SL-3020LFR blend ratio was 1.6,the adhesive performance between the compound and steel cord was better under different curing and aging conditions.
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