Polyurethane and wood-plastic co-extruded composite board and preparation method thereof

Abstract

The present invention provides a polyurethane and wood plastic co-extrusion molding composite board. The polyurethane and wood plastic co-extrusion molding composite board comprises a wood plastic frame and a foaming layer; the wood plastic frame is provided with a first cavity; the foaming layer is put in the first cavity; the foaming layer is bonded to the wall surface of the first cavity; and the foaming layer is prepared by foaming polyurethane materials. According to the co-extrusion molding composite board, raw materials of the foaming layer directly perform polyaddition reaction and foaming in the composite board, so that the foaming layer is formed; the process of filling insulation materials for the second time after a wood plastic hollow wall board is molded in the prior art is saved, the processing technology is substantially simplified, and consumption of manpower and material resources is saved; and during the molding process, the foaming layer is bonded to the wood plastic frame, the foaming layer and the wood plastic frame are composited and integrated, and further physical strength and heat and sound insulation performance of the whole wall board are improved.

Description

technical field [0001] The invention relates to a thermal insulation board, in particular to a composite board formed by co-extrusion of polyurethane and wood-plastic and a preparation method thereof. Background technique [0002] Existing extrusion production of wood-plastic products and co-extrusion foaming production technology using plastic resin powder, wood powder, wood fiber, etc., mostly use the foaming of wood-plastic itself and surface co-extrusion of PVC, PMMA and other surface layers, the middle cavity They are all vacant, and if they need to be used as thermal insulation cavity, it is necessary to inject foamed polyurethane thermal insulation material (such as CN101545300A) into the open mouth or closed mouth of the composite board through the pouring method in the inner cavity of the formed wood-plastic product. foaming material); or use wood-plastic shell molding and cooling to add polyurethane foam, rock wool or foamed perlite and other thermal insulation mat...

AI Technical Summary

Problems solved by technology

[0002] Existing extrusion production of wood-plastic products and co-extrusion foaming production technology using plastic resin powder, wood powder, wood fiber, etc., mostly use the foaming of wood-plastic itself and surface layer co-extrusion of PVC, PMMA and other surface layers, the middle cavity They are all vacant, and if they need to be used as thermal insulation chambers, they need to inject foamed polyurethane thermal insulation materials into the internal cavity of the molded wood-plastic products for the second time (such as CN101545300A pouring into the open or closed cavity of the composite board by the pouring method) Foaming material); or use the wood-plastic shell to form and cool and add polyurethane foam, rock wool or foamed perlite and other thermal insulation materials to the inner cavity of the wood-plastic shell for the second time, which will consume a lot of labor costs and the efficiency is extremely low so that it is difficult to achieve mass production

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