The Application of The Curing Agent DTDM at The Bias Tire Inner and Outerrubber Formulations
Vulcanizing agent DTDM belongs to the sulfur give body, can adjust the vulcanizates network structure, have heat resistance, resistance to fatigue resistance, reduction, not spray frost, coke and good safety, rubber products, heat is the ideal sulfurization agent dynamic products.
At present the prevalence of high speed and overloading the auto operation state of heavy truck bias tyre inner quality put forward higher request, especially to avoid the long time in the course of driving fatigue deformation due to the heat resulting make compound interface and adhesive materials and cord joint surface damage in the shoulder empty phenomenon. My factory produces production of all parts of bias tyre, set out by the inner tire crown to stress in turn increase (in a "stepped-weir"), but because the original of the melt in the outer, set out low stress (inner compound in 4 ~ 5 MPa, outer plastic materials in 6 MPa or so), and buffer layer glue knew stretch stress (10 MPa or so) is large, tire in motion extremely easy because rigid shortcomings and unduly deformation.So it is necessary to tire, rubber material in the outer formula redesigned, an appropriate increase of the melt stretch for stress.
It is of sulfide crosslinking with more sulfur key is given priority to, but can small, sulfur key key unstable, easy to change, and so the heat ageing performance is poor, in the process of tyres used are easy to be returned to the original sulfide phenomenon, which affect the actual use of the tire life.For this reason, we decided to tire, rubber material in the outer formula used half effective vulcanization system, the cross-linking with single and double sulfur key sulfur key is given priority to, thus reduce heat of the melt, improve compound thermal stability and resistance to sulfide, former sex;And at the same time, improve the set of the melt stretch stress, the increase in the amount of carbon black in the premise can make internal and outer of the melt stretch for stress raised, to meet the design requirements.In the choice of half an effective system of sulfide choose when Vulcanizing agent DTDM and promote the NOBS and agent.Vulcanizing agent DTDM sulfur quality score is about 0.27, sulfide temperature can break down in the active sulphur, and the safety of operation, and some common sulfurization agent and can improve speed when sulfide.