A method to characterize the recycling effect of waste thermosetting plastics

Abstract

The invention discloses a method for characterizing a regeneration effect of waste thermosetting plastic. The method is characterized by comprising the following steps: crushing and regenerating thermosetting plastic to obtain regenerated materials; grouping raw materials of the thermosetting plastic and the regenerated materials with different granularities into each powder group; testing the cross-linking density of each powder group; recording the minimum value of the cross-linking density; mixing each group of the regenerated material in each powder group with thermoplastic resin according to a set mass ratio; adding a chemical auxiliary agent for hot press molding to prepare a regenerated plastic product; preparing the regenerated plastic product into a sample and testing the mechanical strength; determining a regeneration coefficient gamma; and determining a quantitative index of the regeneration effect and judging that whether the regenerated powder reaches the index or not. The invention provides the method for quantitatively characterizing the regeneration effect of the regenerated materials in the process of recycling the waste thermosetting plastic by a mechanical physical method; the uncertain factors in the recycling process are overcome.

Description

Technical field [0001] The invention belongs to the field of recycling and reuse of waste polymer materials, and specifically relates to a method for determining the crosslinking density of thermosetting plastics by nuclear magnetic resonance to characterize and evaluate the regeneration effect of regenerated materials obtained during the recycling process of waste thermosetting plastics. Background technique [0002] According to the processing performance of plastics, plastics can be divided into two categories: thermoplastics and thermosetting plastics. Thermoplastics have a linear molecular chain structure, are elastic and plastic, can be dissolved in solvents, can be melted by heat, and can be repeatedly processed into shapes. Thermosetting plastic is a body-shaped network cross-linked molecular chain structure. After solidification and shaping, it cannot be heated and melted, nor can it be dissolved in a solvent, but can only swell. [0003] At present, thermoplastics can be...

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Problems solved by technology

[0004] Although the physical recovery method has various advantages, there is no accurate and reliable evaluation index for the reactivity or molding ability of the recycled material, and it is even impossible to detect it.

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