A kind of co-extruded composite plate and its preparation method

Abstract

The present invention provides a co-extrusion molding composite board. The co-extrusion molding composite board comprises a wood plastic frame, a foaming layer and a metal profile; the wood plastic frame is provided with a first cavity; the metal profile has an opening; the metal profile is positioned in the first cavity; the wall surface of the first cavity is bonded to the surface of the metal profile; the foaming layer is put in a space enclosed by the first cavity and the metal profile; the foaming layer is bonded to the wall surface of the first cavity and the surface of the metal profile; and the foaming layer is prepared by foaming polyurethane materials. According to the composite board, the internal metal profile effectively provides mechanical strength, the metal profile, the foaming layer and the wood plastic frame are composited and integrated, so that the requirement for strength of the wood plastic part is reduced, the foaming technology can be adopted for materials of the wood plastic frame, wood plastic materials are saved, and heat and sound insulation performance of the composite board applied as a wall board is largely improved.

Description

technical field [0001] The invention relates to a thermal insulation board, in particular to a co-extruded composite board and a preparation method thereof. Background technique [0002] Solid clay bricks are often used for traditional building walls, which is not conducive to the protection of cultivated land; at present, wall materials such as aerated concrete blocks and hollow bricks need to be constructed on site, requiring cement wet work, generating a lot of construction waste on site and consuming a lot of labor. , The dimensional accuracy of the wall is also difficult to control, and the construction period is long, ranging from more than half a year to more than one year or even more than two years to complete. [0003] In order to meet the needs of industrialization, ecology, energy saving and green environmental protection of new buildings, Chinese patent CN102650367A provides metal and resin composite co-extrusion profiles with holes or pits, and the metal profil...

AI Technical Summary

Problems solved by technology

[0004] However, the density of wood-plastic composites is 3-4 times that of traditional wood products, its ductility and impact resistance are reduced, the material is brittle, and its mechanical strength (tensile and bending) is smaller than that of unfilled plastics, which limits its application

The inventor found that if the foaming technology is used to improve its performance, because the foamed wood-plastic composite material has strong fluidity, the molten wood-plastic composite material can easily pass through the holes, causing a large amount of foamed wood-plastic composite material to enter the interior of the metal profile. , to block the inner cavity of the metal profile

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