Kinetic analysis of resin binder for casting in combustion decomposition process

Random stacking of waste foundry sand will cause great environmental pollution, so it is necessary to recycle the waste foundry sand produced by resin-bonded sand technology by hot-reclamation to eliminate the residual resin on its surface. The study of thermodynamics analysis of resin binder for casting in combustion decomposition process can provide theoretical support for thermal reclamation. In this paper, TG-DTA technology was applied to measure TG, TGA, DTG curves of the three kinds of resin binders at 0-800 degrees C (furan resin binder, phenolic urethane resin binder and alkaline phenolic resin binder). The ignition point, reaction peak temperature, activation energy, mode function and other parameters of the three resin binders were calculated by the curves, and conclusions are as follows: (1) Furan resin binder, phenolic urethane resin binder and alkaline phenolic resin binder were heated to 800 degrees C in air at a heating rate of 15 degrees C min(-1), and their residual mass was 9.8%, 2.7% and 33.7%, respectively; (2) the highest activation energy of furan resin binder, phenolic urethane resin binder and alkaline phenolic resin binder was 82.35 kJ mol(-1), 90.77 kJ mol(-1) and 335.77 kJ mol(-1), respectively; (3) the reaction mode of three resin binders in each stage is Acceleratory alpha-time(n = 1), f(alpha) = alpha, G(alpha) = ln alpha.

Automated summary

This study used TG-DTA technology to analyze the combustion decomposition process of different resin binders, obtaining parameters such as residual mass and activation energy at high temperatures, providing important data support for thermal reclamation.