Study on Preparation Stage and Mechanism of Modified Desulfurization Ash-Based Eco Rubber by X-Ray Diffraction
ZHANG Hao1,2, ZHANG Lei1, LIU Xiu-yu1
1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243032, China
2. Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Ma’anshan 243002, China
Abstract：As main by-product of semi-dry desulfurization technology, desulfurization ash is very difficult to be utilized and there is a high -cost for its utilization. It cannot be disposed through direct stacking and landfill, otherwise it will cause environmental pollution and waste of potential resources. Rubber is a kind of widely used polymer material, of which the mechanical properties, machining properties and filling capacity can be improved by using large amounts of fillers during preparation. Carbon black and white carbon black, as the commonly used rubber packing, can only be prepared by complicated process, which always leads to large consumption of energy and resources, resulting in higher costs. Thus, the development of desulfurization ash into low-cost inorganic rubber fillers has become one of the main methods to achieve resource sustainable development and enhance economic performance by high value-added utilization of solid wastes and cost reduction of fillers in rubber industry to a great extent, respectively. The desulfurization ash is organic while rubber is inorganic. Therefore, chemical modification is necessary to be conducted for desulfurization ash to weaken incompatibility of interface(organic/inorganic) between them. Based on the research results obtained in the early stage of this research group, in this paper, modified desulfurization ash was innovatively used to replace part of carbon black to prepare modified desulfurization ash-based eco rubber. Production materials in every stage of preparation process of modified desulfurization ash-based eco rubber were measured by XRD, such as preparation stage of styrene butadiene rubber mixer glue, preparation stage of modified desulfurization ash-based eco rubber mixer glue and preparation stage of modified desulfurization ash-based eco rubber. The preparation process of styrene butadiene rubber mixer glue, preparation process of modified desulfurization ash-based eco rubber mixer glue and preparation process of modified desulfurization ash-based eco rubber were revealed at the microscopic level, respectively, in order to explain the bonding mechanism of styrene butadiene rubber mixer glue and modified desulfurization ash in vulcanization process. Meanwhile, microstructures of styrene butadiene rubber mixer glue and modified desulfurization ash-based eco rubber mixer glue were tested by SEM so as to further support the obtained mechanism. The results showed that after adding modified desulphurizing ash to styrene butadiene rubber, modified desulfurization ash-based eco rubber’ maximum torque Fmax drops dramatically, minimum torque FL remains stable, △F=Fmax-FL is significantly reduced, meanwhile scorch time and optimum cure time are shortened. Vulcanization induction stage is 0~387 s, vulcanization reaction stage is 387~1 586 s and vulcanization flat stage is 1 586~1 800 s. Form the non- crosslinking network structure in vulcanization induction stage, form the basic crosslinking network structure in early of vulcanization reaction stage, improve the crosslinking network structure in later of vulcanization reaction stage and maintain the crosslinking network structure in vulcanization flat stage. It aims to provide some theoretical basis and technical support for high value-added desulphurization ash resource utilization.
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