Composite board formed by co-extrusion of wood-plastic and foam layer and preparation method thereof

Abstract

The invention provides a composite plate formed by co-extruding wood, plastics and a foaming layer. The composite plate comprises a wood and plastic framework and the foaming layer. The wood and plastic framework is provided with a first cavity. The first cavity is filled with the foaming layer, and the foaming layer is bonded to the wall face of the first cavity, wherein the foaming layer is made from foaming materials, and raw materials of the foaming layer do not contain wood powder, wood fibers, glass fibers or basalt fibers. According to the composite plate formed through co-extrusion, the foaming layer does not contain wood powder, wood fibers, glass fibers or basalt fibers, the foaming effect can be 490 Kg / m<3> or below or even reaches 238 Kg / m<3>, and an efficient heat-preserving, heat-insulating and sound-insulating effect is achieved.

Description

technical field [0001] The invention relates to a thermal insulation board, in particular to a composite board co-extruded with wood-plastic and a foam layer 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 materials to...

AI Technical Summary

Problems solved by technology

Although the inner layer or core layer of the co-extruded composite board has thermal insulation effect, the foaming efficiency is low, and it is technically difficult to achieve a density of 500Kg / m 3 the following

[0004] Disclosed in Chinese patent CN102731903A is a kind of FRP composite material, manufacturing method and application, this FRP composite material is a three-layer co-extrusion, does not contain wood flour, but the outer layer and the core layer contain inorganic fillers such as glass fiber, basalt fiber, The density is too heavy, the foaming efficiency is still very low, and it is difficult to reach a density of 500Kg / m 3 Below, without wood decoration and high thermal insulation effect at the same time

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