| The number of waste tires is great in our country. They piled up together as solid waste, causing serious pollution of the environment, and it will harm to the health of the people. So the recycling of waste tires is an important problem. At present, the pyrolytic process of waste tires is considered to be an effective way for tire recycling. Pyrolytic carbon black from waste tires (CBp) is one of the main products of thermal-cracking process of waste tires, and the application of CBp is the key issue of the recycling process. We investigated the basic characteristics of CBp, the impact on the properties of the SBR rubber, the modification of CBp. We hopes to give the products some added value, expand the application field of it and improve its reinforcing effect.In this paper, the basic properties of CBp were chanracterized and compared with different fillers. The elemental analysis showed that the C-CBp and T-CBp both included C, O, S, Si, Zn, and the latter contained Ca element; the particle size and surface groups of CBps were basically similar. Compared with N330, two kinds of CBp’s iodine value, DBP absorption value, and heating loss were lower, and ash content were much higher. Mooney viscosity of compounds filled with C-CBp or T-CBp both decreased; MH and ML increased obviously while tsl and tc90 were shortened slightly. The mechanical properties of vulcanizates filled with two kinds of CBp were improved, and tear strength were the most prominent. C-CBp showed better reinforcing effect, processability and better dispersion than that of T-CBp.The basic properties of powder and granules CBp and its application in the SBR were studied. Results showed that the powder CBp’s heating loss, iodine value and DBP absorption value were slightly lower than that of granules CBp, both contained the same elements and groups, and their particle size were similar. Besides, MH and ML of compounds filled with powder CBp were higher than that of granules CBp, and tsl of the former was longer. Tensile strength, tear strength and abrasion resistance of vulcanized rubber filled with powder CBp were better. Overall, the reinforcing effect of powder CBp was better.The modifying effect of CBp by different modifier and modified method were investigated in this paper. The experimental results showed that surface groups of CBp increased after dry modification with stearic acid and boric acid ester; Tensile strength, tear strength and abrasion resistance of SBR vulcanizates filled by modifying CBp significantly improved; and the suitable dosage of two modifiers were 2%., Mooney viscosity of SBR compounds filled with modified CBp by wet modification decreased; tsl and tc90 slightly were extended. The storage modulus of the compounds decreased significantly. Tensile strength, modulus and abrasion resistance of vulcanizates filled with modified CBp by wet modification were significantly increased. Other properties showed no obvious change. Moreover, the modifying effect of stearic acid and boric acid ester were similar.Different kinds of acid solution were used to deash for CBp, and the characterization of WCBp and the reinforcing effect in rubber were studied. Results showed that the content of O element increased after pickling, and the content of S, Si, Zn decreased obviously; Ash content decreased significantly. The CBp with increased specific surface area, narrower size range, more polar functional groups on the surface were got after treatment, while pore structure was improved. Mooney viscosity of SBR compounds filled with WCBp decreased obviously. Tensile strength, modulus and abrasion resistance of vulcanizates filled with three kinds WCBp were significantly increased. And these WCBps showed better dispersibility in the rubber. Moreover, the performance of compound and vulcanizate filled with WCBp3 improved obviously, which suggested the treatment effect of HNO3 was the best. |
PDF Full Text Request