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Investigation of the Effect Recycled Nanosilica from Battery Separator by Pyrolysis Method on Mechanical Properties and Adhesion between Rubber and Steel

Shojaei, Mohammad Reza | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54934 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pircheraghi, Gholamreza
  7. Abstract:
  8. Creating sustainable development in today's human societies is essential, one of the pillars of achieving this important goal is environmental protection. Thus, waste management as a new challenge is leading engineers. Lead-acid battery waste is one of the sources of environmental pollution. Lead-acid battery separators contain 50% recyclable nanosilica. The main challenge of recycling nanosilica from separators is the presence of significant amounts of 6 to 9% wt.% of lead and 5% by weight of other impurities. Therefore, in the present study, lead trapped in the separating pores is removed using mechanical washing or abrasive washing. Then, the quality of recycled nanosilica is evaluated using various methods. According to the results, recycled nanosilica has a purity of more than 98% wt.%, particle size of 20 to 30 nm, specific surface area of 115 m2/g, amorphous with silanol surface groups. Today, in addition to the importance of recycling, it is very important to find the appropriate application for recycled materials. In the present study, a comprehensive study of the effect of recycled nanosilica on the mechanical properties of natural rubber/synthetic rubber including tensile properties, tear strength, hardness and abrasion resistance has been performed. Since the surface chemistry of recycled nanosilica is completely polar, two types of surface modification including silane 69 and phenolic antioxidant 1010 have been used in this study to make it compatible with rubber chains. Based on the results, the mechanical properties of the mixture containing recycled nanosilica modified with silane 69 were improved compared to the control sample. Tensile strength about 59%, modulus about 196% and hardness about 30% increased for the sample containing silane 69 compared to the control sample. Also, the response of the antioxidant-modified sample to the mechanical properties of the control sample is acceptable. It should be noted that the highest amount of crosslinks according to the swelling test is related to nanosilica modified with silane 69. Therefore, the unique mechanical behavior of this sample is confirmed. In the following, the effect of recycled nanosilica in rubber compound on the adhesion between rubber and steel by shear and tensile methods has been investigated. The highest adhesion is related to the sample containing recycled nanosilica modified with silane 69. Therefore, the cooperative properties of recycled nanosilica and silane 69 are confirmed. Finally, the use of recycled nanosilica with Si-69 leads to sustainable development with the production of green composite, which in addition to the acceptable improvement of mechanical properties, also increases the adhesion of rubber to steel. Therefore, recycled nanosilica can be used in the production of green tires.
  9. Keywords:
  10. Adhesion ; Sustainable Development ; Lead Acid Battery ; Silane 69 ; Recycled Nanosilica ; Polymer-Metal ; Green Nanocomposite

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