The preparation of environmentally friendly,safe and durable high-performance tires is an important direction for the development of modern tires.In order to prepare high-performance tires,different rubbers are often used together to achieve the purpose of complementing each other’s strengths and giving rubber more excellent performance.Due to the differences in the chemical composition and structure of the various components of the rubber blends,and the characteristics of the cross-linking reaction of each rubber phase during vulcanization,the co-vulcanization of the rubber blends is an important research content for the preparation of high-performance tires.At the same time,the dispersion state of the filler in the rubber matrix and the interface bonding between the filler and the rubber are essential for obtaining high-performance rubber composites.The silica-loaded rubber additives can not only promote the dispersion of the filler itself in the rubber,but also improve the distribution ratio and dispersion state of the small molecule additives in the two rubber phases.Therefore,it is very necessary to use environmentally friendly,efficient,and multifunctional supported accelerators to prepare high-performance rubber blends composite materials.In this thesis,2-mercaptoimidazoline(ETU),which is not easy to pollute and has stable chemical properties,is innovatively selected as the secondary rubber accelerator,and silica-supported accelerator(Si O2-s-ETU)and accelerator N-ring are used.Hexyl-2-benzothiazole sulfenamide(CZ)was used together to prepare natural rubber/styrene butadiene rubber(NR/SBR)composites.By studying the effect of CZ/Si O2-s-ETU on the crosslinking kinetics of NR/SBR blends,it is found that Si O2-s-ETU can effectively promote the co-vulcanization of rubber blends.In addition,the accelerator N-tert-butyl-2-benzothiazole sulfenamide(NS),which is environmentally friendly,has good aftereffect and does not produce carcinogens,is used to prepare the silica load accelerator(Si O2-s-NS),And applied it to SBR single rubber and NR/SBR blends system respectively,and studied the influence of Si O2-s-NS on SBR single rubber and NR/SBR blends vulcanization performance and mechanical properties.Using high resolution pyrolysis gas chromatography-mass spectrometry(HR Py GC-MS)combined with a variety of characterization methods,the two supported accelerators,Si O2-s-ETU and Si O2-s-NS with silica as the carrier,were systematically studied The effects on the crosslinking kinetics and performance of NR/SBR blends.The effects of different modification methods on rubber vulcanization rate,relative gel rate,physical and mechanical aspects are discussed in depth.The main contents are as follows:(1)Prepare the supported secondary accelerator silica loading accelerator ETU(Si O2-s-ETU)and use it together with the accelerator CZ to prepare it into NR/SBR/CZ/Si O2-s-ETU composite material.The loaded composites are compared.The results show that the loaded silica has better dispersion properties than the directly added and unloaded systems,and can significantly reduce the agglomeration of fillers in rubber.And it can effectively promote the vulcanization of the rubber blends,so that the natural rubber and styrene butadiene rubber can basically reach the completion of vulcanization at the end of vulcanization,which has better performance of promoting co-vulcanization.(2)The use of environmentally friendly accelerator accelerator NS modified silica,prepared silica supporting promoted NS.Infrared spectroscopy,XPS and other means were used to characterize the results.The results showed that the promoter NS was effectively loaded on the surface of silica.Compared with unmodified and silane coupling agent modified fillers,it is found that the loaded silica has better vulcanization accelerating performance,not only can significantly reduce the vulcanization time,but also can extend the scorch time and improve the processing safety.After being loaded,the silica has better dispersion performance in the rubber matrix,reducing the formation of the filler network,so that the styrene-butadiene rubber composite material has better processing performance.(3)The NR/SBR blends with the silica supporting accelerator NS(Si O2-s-NS),the NR/SBR/Si O2-s-NS composite material is prepared,the accelerator after loading can significantly reduce the activation energy required for vulcanization,increase the vulcanization speed of the rubber blends,and use Py GC-MS to compare its crosslinking kinetics.The fillers and additives can make the rubber blends achieve better co-vulcanization,indicating that the fillers and additives can be better dispersed in the two gum phases,so that the two gum phases have a faster vulcanization rate.After loading,the filler is more evenly dispersed in the rubber blends and also reduces the agglomeration of the filler in the rubber matrix,so that the NR/SBR composite has better processing performance. |