| 摘要 |
1299177 Laminated resin-fibre composites CIBA GEIGY (UK) Ltd 2 Jan 1970 [17 Jan 1969] 2880/69 Heading B5N [Also in Division D1] A reinforced composite is made by contacting a solid film of a thermosettable resin composition with strands of unidirectional reinforcing material comprising glass, boron or carbon fibres under such conditions that the resin flows around the strands, e.g. by applying heat and/or pressure. The resin may be subsequently cured by further heating. The reinforcement may be in mat or bundle form. A strippable polyethylene or paper backing may be provided for the resin film at the face opposite the strands, and the film may be given a tacky surface by coating with a curable substance, e.g. phenolic resin, which is tacky at room temperature. Further layers of resin and strands may be present. In batch operation, the reinforcing strands may be laid under tension on one film and a second film is then applied prior to pressing with heat. In continuous operation, either (i) a resin film is contacted with reinforcing strands which are supported on a strippable backing, the backing is removed, and a second resin film is applied, or (ii) supported films are simultaneously applied to each face of a reinforcing strand layer. The thermosetting resin may include particles of thermoplastic resin; specified compositions are: (a) phenolformaldehyde resole and polyvinylacetal or nylon, (b) phenol-formaldehyde novolak with neoprene or acrylonitrile rubbers, (c) epoxy resin with phenoxy resin, polysulphone orα-olefincarboxylic ester copolymer. The resin may contain powdered silica and dicyandiamide or hexamethylene tetramine, and may be cured to the B-stage to permit shaping of the article before final cure to the C-stage. Other sheet materials can be included as reinforcements, aluminium foils and honeycombs and resinimpregnated glass fibre mats and fabrics being used in examples; sheets of steel, titanium, nylon, polyimide, polysulphone, polycarbonate, natural rubber, neoprene and acrylonitrile rubber are also mentioned. |
