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    • 88. 发明授权
    • Pre-fabricated gel coats
    • 预制凝胶涂层
    • US3812074A
    • 1974-05-21
    • US32158473
    • 1973-01-08
    • FERRO CORP
    • OSWITCH SKIPP K
    • B29C37/00C08J5/00C08G51/38C08G41/04C08G51/16
    • C08J5/00B29C37/0032B29C2037/0042B29K2067/00B29K2067/06
    • A PRE-FABRICATED GEL COAT IS DISCLOSED IN THE FORM OF A DRY SHEET THAT CAN BE EASILY HANDLED AND PREHAPED AS FOR LINING A MOLD. THE PRE-FABRICATED GEL COAT COMPRISES A LAYER OF PARTIALLY CURED, CURABLE, THERMOSETTING POLYESTER RESIN, AND A FIBROUS REINFORCING MEDIUM OF THERMOPLASTIC FIBERS. THE FIBERS HAVE A SOFTENING TEMPERATURE NO HIGHER THAN THAT OF A HEATING OPERATION TO WHICH THE GEL COAT IS TO BE SUBJECTED SUCH AS A MOLDING OPERATION. WHEN HEATED, THE PARTIALLY CURED RESIN AND THE THERMOPLASTIC FIBERS SOFTEN TO PERMIT THE GEL COAT TO FLOW AND ACCOMMODATE ITSELF TO A DESIRED, NONPLANAR CONFIGURATION WITH SUBSEQUENT FINAL CURE OF THE THERMOSETTING POLYESTER RESIN IN THE DESIRED NONPLANAR CONFIGURATION. PREFERABLY, THE GEL COAT IS USED TO LINE A MOLD IN WHICH A HEAT-SETTABLE RESIN AND CURABLE POLYESTER RESIN MAY BE CURED SUBSTANTIALLY SIMULTANEOUSLY TO FORM A PRODUCT OF THE HEAT-SETTABLE RESIN HAING A COVERING OF THE GEL COAT SIMULTANEOUS CURE OF A HEAT-SETTABLE RESIN AND THE GEL COAT WITHIN A MOLD AVOIDS THE MESSINESS AND NONUNIFORM THICKNESS RESULTING FROM BRUSHING OR SPRAY COATING MOLDS PRIOR TO MOLDING AND CONSIDERABLY REDUCES THE TIME REQUIRED FOR THE TOTAL MOLDING OPERATION. THE THERMOSETTING POLYESTER RESIN PREFERABLY CONTAINS AN UNSATURATED CROSS-LINKER THAT IS SOLID AT ROOM TEMPERATURES TO FACILITATE RETENTION OF A DRY FORM FOR THE PRE-FABRICATED GEL COAT. THE THERMOPLASTIC FIBERS COMPRISE A RESIN COMPATIBLE WITH THE THERMOSETTING POLYESTER RESIN OF THE GEL COAT, SUCH AS A THERMOPLASTIC, SATURATED POLYESTER RESIN,