Polyurethane (PU) synthetic leather production process allowing solid waste recycling

Abstract

The invention discloses a polyurethane (PU) synthetic leather production process allowing solid waste recycling. The process is characterized by including the following steps: mixing buffing powder and dimethyl formamide (DMF) with the mass ratio as 1:5-5.5 in a stirring kettle; remixing the mixture and stopping mixing after the mixture is completely mixed; conducting centrifugal separation of mixed slurry to separate the mixed slurry into the liquid phase and the solid phase, wherein the liquid phase is recycled as a polyurethane resin raw material in a wet method slurry process; processing the solid phase and mixing the solid phase and the DMF with the mass ratio as 1:4-4.5; conducting stirring through a disperser, conducting secondary centrifugal separation to obtain the liquid phase which is utilized as the DMF raw material in the last step, conducting washing on the solid phase obtained through the secondary centrifugal separation, conducting stirring through a stirring machine, and then conducting tertiary centrifugal separation; enabling the liquid phase to flow back into a transfer water tank in a non-metering mode and recycling or reprocessing washed cloth wool. The process reduces production cost, and conversion of the solid waste powder reduces pollution.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather production, and relates to a PU synthetic leather production process for recycling solid waste, in particular to a production process of PU synthetic leather that fully utilizes solid waste powder, waste products and corners produced after skin grinding Waste, and the process of recycling the waste film that absorbs water and solidifies in the wet production process. Background technique [0002] Wet production process is the main production process in the production process of PU synthetic leather, and the products produced by wet process are the basic products of all PU synthetic leather products, that is, semi-finished products. To become the final product, post-processing is required, and post-processing mainly includes processes such as skin grinding, printing, and embossing. The reason for microdermabrasion is to peel off the surface layer, so that the foam layer is exposed outsid...

AI Technical Summary

Problems solved by technology

Among them, the incineration method: since the combustion of polyurethane in the air requires a large amount of oxygen to participate, and the oxygen content in the air is 21%, the ordinary combustion method is not enough to completely burn the polyurethane in the solid waste powder, which will produce a large amount of black smoke. Floating in the air, affecting air quality and polluting the environment

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