| 摘要 |
The invention relates to a method for producing sandwich construction elements for substantially load-bearing and self-supporting building parts. In one embodiment of the invention, a method is provided including a) producing at least one layer of a mechanically bonded fiber nonwoven which is impregnated with a binder based on at least one heat-curable resin system b) curing the heat-curable resin system in order to produce at least one hardened layer of the fiber nonwoven, and fixed thermally, c) bringing a heat-foamable or heat-foamed phenol resin into contact with that surface of at least one hardened layer of the fiber nonwoven which has been modified according to step b), d) possibly annealing the composite produced in a) to c), and e) curing the further binder based on at least one heat-curable resin system. |
| 主权项 |
1. A method for producing sandwich construction elements for essentially loadbearing and self-supporting parts of a building, said method comprising the steps of
a) producing one or more than one ply of a mechanically consolidated fibrous fleece based on naturally occurring raw materials selected from the group consisting of hemp, flax, jute, sisal, kenaf, cotton, wool, and mixtures thereof, each ply impregnated with a binder based on one or more than one heat-curable resin system, b) curing the heat-curable resin system to produce one or more than one cured ply of the fibrous fleece, applying a surface structure to at least part of each ply of the fibrous fleece before and/or during curing; and/or applying and thermally fixing one or more than one further binder based on one or more than one heat-curable resin system to at least part of a surface of the cured ply of the fibrous fleece, c) contacting a thermally foamable or foamed phenolic resin with the surface, as modified in step b), of one or more than one cured ply of the fibrous fleece, d) optionally subjecting the composite produced under a) to c) to conditioning at temperatures in a range from 40 to 80° C., and e) if applied, subjecting the further binder based on one or more than one heat-curable resin system and optionally applied in b) to curing in a range from 150 to 200° C., optionally under elevated pressure. |
