A method for recycling waste cross-linked polyethylene foam plastics

Abstract

The invention relates to a method of recovering and utilizing waste crosslinked polyethylene foam plastics. The method comprises the following steps of: (1) classifying and grinding: classifying, grinding and screening the waste crosslinked polyethylene foam plastics to obtain a ground material; (2) granulating, namely by replacing some a new raw material, adding the ground material into polyethylene and ethylene-vinyl acetate, also adding a main antioxidant, a foaming agent, an auxiliary antioxidant and other additives to carry out mixing and granulating, and preparing a master batch; (3) extruding into a master slice, namely mixing the prepared master batch with a sensitizer, and extruding a mixture by an extrusion calender to form continuous master slices; (4) irradiating, namely carrying out continuous radiation crosslinking on the obtained master slices; and (5) foaming, namely putting the irradiated master slices into a foaming furnace to prepare a foaming material which accords with the requirements through foaming, returning a foaming material which does not accord with the requirements to the first step, and recovering and utilizing the foaming material again. By adopting the method, the waste crosslinked polyethylene foam plastics can be recovered and utilized, so that the purposes of cyclic utilization, lowered cost and reduction in environmental pollution are reached.

Description

technical field [0001] The invention belongs to the technical field of recycling waste plastics, and in particular relates to a method for recycling waste cross-linked polyethylene foam plastics. Background technique [0002] As a type of foam plastics, cross-linked (including radiation cross-linked and chemical cross-linked) polyethylene foams have superior performance and are widely used in packaging, heat preservation, construction engineering, sporting goods, transportation and other fields to play a role in waterproofing and heat preservation. , heat insulation, shock absorption and other functions. A certain amount of waste polyethylene foam will be produced during the production and use of this product, mainly including waste products, defective products, scraps and waste foam produced after the use of cross-linked polyethylene foam. About 1,000 tons of such waste foam plastics are produced nationwide every year. Since this foam has been cross-linked, it is difficul...

AI Technical Summary

Problems solved by technology

[0003] At present, the recycling technology of domestic waste cross-linked polyethylene foam is almost blank, and the existing few technologies are also difficult to realize due to reasons such as large investment and high consumption.

Beijing University of Petroleum, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, and Shanxi Coal Chemical Institute have all carried out research on thermal cracking catalysts for olefin plastics, and have made some progress in the field of catalytic cracking of polyethylene, polypropylene and other gasoline recovery, but due to high cost and large scale Small, lack of market competitiveness

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