Reichhold (Durham, N.C.) is introducing a new resin product based on its proprietary vinyl hybrid resin chemistry for advanced composite applications. The products include ADVALITE vinyl hybrids liquid and ADVALITE vinyl hybrids hot melt prepreg resins. The hot melt resins are monomer-free and the liquid resins are styrene-free and typically do not contain reactive diluents. ADVALITE resins reportedly exhibit excellent mechanical properties and temperature resistance up to 200ºC/392°F. These resins are cured using standard free-radical inhibitors and initiators. This is said to allow significant processing advantages as compared to epoxy resins. The low exotherm of the resins allows for rapid curing of thick laminates without cracking. The resins also exhibit excellent retention of hot/wet Tg properties. ADVALITE liquid resins can be used in resin transfer molding (RTM), infusion, filament winding, liquid molding and pultrusion processes. The ADVALITE hot melt prepreg resins can be either directly coated or adhesive filmed for fiber impregnation. The free-radical cure mechanism allows for extended room temperature storage while delivering snap cures at elevated temperatures. When compared to epoxy resins, ADVALITE's rapid rate of cure reportedly permits significantly reduced production cycle times. Additionally, in automotive headspace, testing the cured laminate was demonstrated to be VOC-free. Resin properties can be tailored to meet processor’s individual specifications and requirements. Reichhold says several automotive applications are in production and a specialty system for composite radomes has been developed.
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