초록 ▼

The panel material of the present invention comprises (A) two sheets of FRP molded board as upper and lower surface materials, and, as a core material, (B) a high density, rigid polyurethane foam layer which has been obtained by injecting a rigid polyurethane foam starting material between these two

The panel material of the present invention comprises (A) two sheets of FRP molded board as upper and lower surface materials, and, as a core material, (B) a high density, rigid polyurethane foam layer which has been obtained by injecting a rigid polyurethane foam starting material between these two sheets of FRP molded board and allowing this starting material to foam, and which has a closed cell structure and a density of 0.2.about.0.5 g/cm.sup.3. In addition, the manufacturing method of the panel material of the present invention includes a process for obtaining an integrally molded sandwich panel by injecting a rigid polyurethane foam starting material into a space between two sheets of FRP molded board which have been set in a mold, and allowing it to foam; and a process in which panel material is made by cutting this sandwich panel to a desired size. The panel material of the present invention is particularly suitable for use as flooring in vehicles such as trucks, buses, railway rolling stock, freight containers, and the like.

대표청구항 ▼

[ We claim:] [1.] A panel material comprising(A) two sheets of fiber reinforced plastic (FRP) molded board as upper and lower surface materials; and(B) a high density, rigid polyurethane foam as a core material having a density of 0.2-0.5 g/cm.sup.3 and a closed cell structure, said high density, ri

[ We claim:] [1.] A panel material comprising(A) two sheets of fiber reinforced plastic (FRP) molded board as upper and lower surface materials; and(B) a high density, rigid polyurethane foam as a core material having a density of 0.2-0.5 g/cm.sup.3 and a closed cell structure, said high density, rigid polyurethane foam having been obtained by foaming between said two sheets of fiber reinforced plastic molded board, wherein a thermal curable resin of said fiber reinforced plastic molded board (A) is a radical polymerizable unsaturated resin, and sheets of reinforcing fiber material having a fiber weight of 100-800 g/m.sup.2 per sheet are used, and a total amount of said reinforcing fiber material per said fiber reinforced plastic molded board is 800-1700 g/m.sup.2.