| 摘要 |
1,266,097. Thermosetting resin impregnated laminates. SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ N.V. 26 June, 1970, No. 31101/70. Heading B5N. An article impregnated with thermosetting resin is produced by impregnating a sheet having an open-cell foam structure with a curable thermosetting resin, e.g. an epoxy or polyester resin, applying a layer of fibrous reinforcing material, e.g. a glass fibre mat or non-woven web, to a side of the impregnated foam sheet, compressing the foam sheet and fibrous reinforcing layer to the extent that resin is expelled from the sheet into the fibrous-reinforcing layer to impregnate this layer with resin throughout its thickness and allowing the resin in the sheet and layer to cure whilst maintaining the compression. The open-cell foam structure which may be of thermoplastics material, polyurethane or elastomer, may be impregnated with the thermosetting resin by immersing it in a bath of liquid resin and compressing it in the bath by passage between compression rolls, and then passing it between another set of rolls to reduce the volume of resin held in the sheet. The resin may then be partly cured, e.g. to the B-stage, and the foam sheet contacted on one or both surfaces with the fibrous layer or the article assembled from alternating layers of impregnated foam sheets and fibrous layers. Pressure may be applied in a mould or by passage between rolls or two opposite endless belts. The compression may be applied selectively over the surface so that the combined thickness of the compressed sheet and layer is not uniform. The process may be used in the production of hulls of boats. |
