Composite aluminum alloy profile and preparation method therefor

A composite aluminum alloy profile, comprising an outer decorative profile, a polyurethane elastomer structural adhesive, and an inner frame profile, wherein the outer decorative profile is connected to an outside of the inner frame profile through the polyurethane elastomer structural adhesive;

• wherein the inner frame profile is a continuous glass fiber resin reinforced profile and is an integral component of alkali-free glass fibers and polyurethane resin formed by a one-time extrusion, a cross section of the inner frame profile is symmetrically arranged up and down and left and right, with a hollow interior, and the inner frame profile comprises one upper closed cavity and one lower closed cavity for a total of two cavities and a reinforced heat insulation rib plate between the upper closed cavity and the lower closed cavity, wherein left and right sides of outer walls at upper and lower ends of the inner frame profile are symmetrically provided with embedding grooves and adhering bumps for embedding, and left and right outer walls of the inner frame profile are symmetrically provided with T-shaped mounting strips;
• a center between upper and lower outer walls of the inner frame profile is provided with a clamping recess;
• wherein the outer decorative profile is an aluminum alloy decorative panel, an inside face of the outer decorative profile is symmetrically provided with one left connecting clamp for embedding and one right connecting clamps for embedding, a center of the outer decorative profile is provided with a clamping protrusion matched with a position and a shape of the clamping recess and a plurality of adhering protrusions for embedding, left and right sides of the outer decorative profile are internally provided with short flanges, a top portion of the connecting clamp for embedding is provided with an embedding block, the embedding block is matched with a shape of the embedding groove, and the embedding block is embedded in the embedding groove;
• wherein two faces of the inner frame profile are assembled with the outer decorative profile, an adhering gap is arranged between the outer decorative profile and the inner frame profile, and the polyurethane elastomer structural adhesive is arranged in the adhering gap;
• wherein the inner frame profile comprises 70% to 85% by weight of alkali-free glass fibers and 15% to 30% by weight of polyurethane resin;
• and
• wherein the polyurethane elastomer structural adhesive is mixed with a polyether polyol mixture and a diphenylmethane diisocyanate-based mixture.