UV protective surfacing materials for composite parts
AssigneeCytec Industries Inc.
InventorsJunjie Jeffrey Sang, Dalip K. Kohli
Life of this patent
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Abstract
A surfacing material that is capable of ultraviolet (UV) protection. The surfacing material is a multilayer structure composed of a woven peel ply fabric interposed between a first curable resin layer and a second curable resin layer. The surfacing material is designed to be co-cured with a composite substrate, for example, a prepreg layup. Upon curing, the peel ply fabric combined with the outer thermoset layer function as a UV protective layer. When the peel ply fabric and the outer thermoset layer are removed, a paint-ready surface is revealed. Such surface does not require any surface preparation prior to painting.
Claims12
A surfacing material that is capable of ultraviolet (UV) protection, comprising:
- a woven peel ply fabric interposed between a first curable resin layer and a second curable resin layer,
- wherein
- the woven peel ply fabric comprises polymeric fibers, has a thickness in the range of 76 μm to 127 μm, a warp yarn count of greater than 70 yarns per square inch, and a weft yarn count of at least 50 yarns per square inch, and
- each curable resin layer is formed from a resin composition comprising:
- an epoxy novolac resin having epoxy functionality of more than one;
- a tri-functional or tetra-functional epoxy resin;
- ceramic microspheres;
- an amine-based curing agent;
- at least one toughening agent selected from a group consisting of:
- (i) a pre-react adduct formed by the reaction of an epoxy resin, a bisphenol, and an elastomer;
- (ii) a copolymer of polyether sulfone (PES) and polyetherether sulfone (PEES);
- and (iii) core-shell rubber (CSR) particles.
Dependencies are inferred from the claim text.