Research On Regeneration And Recycling Of Thermosetting Plastics Based On Mechanical And Physical Methods

After thermosetting plastic products have been cured, a cross-linked molecule structure forms.They neither melt when heated nor dissolve when put into a solvent. Therefore, it is a greatchallenge to recycle thermosetting plastic and if not it will lead to resource waste and cause all kindsof environment pollutions. But thermosetting plastic has excellent performances such as heatresistance, wear resistance, insulation, high voltage etc, and it is widely used. So it has greatsignificance for application research of waste thermosetting plastic recycling to save resources andprotect the environment.The recycling process of waste thermosetting plastic including smashing, regeneration,blending and forming based on mechanical and physical method is discussed. In this paper,mechanics of the crushing process of thermosetting plastic is analyzed and the crushing model isestablished. Regeneration mechanism and mechanochemical effect of thermosetting plastic inmechanical and thermal fields is studied, the regeneration theory model is established, physical andchemical phenomena and basic laws of the regeneration process are summarized. The regenerationtheory of mixing process and forming process is analyzed, and recycling of waste thermosettingplastic is completed.An optimized recycling method and process of waste thermosetting plastic is promoted.Structures and functions of a recycling experiment system are determined, and the specialexperiment equipment is designed and manufactured. Through the computer numerical simulationand analysis of mechanical structures, crushing and regeneration effects of thermosetting plastic areoptimized, utilization ratio of materials and mechanical properties of regeneration composite plasticare all improved.With thermosetting phenolic plastic as the research object, regeneration and recyclingexperiments based on mechanical physical methods are carried out, Plasticity reworked materials areproduced and their molecular structures, properties and characteristics of surface morphology areanalyzed. Results show that chemical structures and properties will be changed under mechanicalphysical functions, network crosslinking chains will rupture, active groups will produce, crosslinkingdensity will decrease and reworked materials have activity and forming ability at last. Usingphenolic reworked materials as main raw materials, the regenerated composite plastic is successfullymade. The test of mechanical property indicates that the composite plastic meet the requirement ofthermoplastic plastics. So the recovery utilization rate improves and waste thermosetting plasticrecycling are completed. The assessment model for thermosetting plastic waste recycling is established. Multipleregression fitting, variance analysis and significance test are completed based on experimental data.The relationship including influence law and significant level between craft parameters andregeneration effectiveness, mechanical strength of composite plastics is confirmed.Besides, thermosetting polyurethane is studied as well in the project, in the end, betterregeneration effectiveness is achieved.