초록 ▼

A resin-rich peel ply that does not leave behind residual fibers after peeling and can work well with different resin-based composite substrates. The resin-rich peel ply is composed of a woven fabric impregnated with a resin matrix different from the resin matrix of the composite substrate. The peel

A resin-rich peel ply that does not leave behind residual fibers after peeling and can work well with different resin-based composite substrates. The resin-rich peel ply is composed of a woven fabric impregnated with a resin matrix different from the resin matrix of the composite substrate. The peel ply is designed such that, upon manual removal of the peel ply from the composite substrate's surface, a thin film of the peel ply resin remains on the composite substrate's surface to create a bondable surface capable of bonding with another composite substrate, but no fibrous material from the woven fabric remains on the same surface.

대표청구항 ▼

1. A peel ply system for surface preparation of various composite substrates, said system comprising: (a) a composite substrate comprising reinforcing fibers impregnated with a cured, first resin matrix; and(b) a removable, resin-rich peel ply adhered to a surface of the composite substrate, said pe

1. A peel ply system for surface preparation of various composite substrates, said system comprising: (a) a composite substrate comprising reinforcing fibers impregnated with a cured, first resin matrix; and(b) a removable, resin-rich peel ply adhered to a surface of the composite substrate, said peel ply comprising a woven fabric impregnated with a cured, second resin matrix different from the first resin matrix,whereby, upon manual removal of the peel ply from the composite substrate's surface, a thin film of the second resin matrix remains on the composite substrate's surface to provide a bondable surface capable of co-bonding and secondary bonding with another composite substrate,wherein said second resin matrix is formed from a resin composition comprising:at least one epoxidized novolac resin having epoxy functionality of at least 2;di-functional epoxy resin selected from diglycidyl ethers of polyhydric phenols;tri-functional epoxy resin selected from triglycidyl ethers of aminophenols;a curing agent; andinorganic filler particles;wherein said peel ply has a resin content of at least 20% by weight based on the total weight of the peel ply, andwherein said woven fabric comprises a plurality of yarns woven in a weaving pattern, said yarns having warp tensile strength of ≧70 lbf/in, fill tensile strength of ≧40 lbf/in, warp linear mass density within the range of 50-250 deniers, and fill linear mass density within the range of 50-250 deniers. 2. The system of claim 1, wherein said yarns have warp tensile strength of ≧80 lbf/in, fill tensile strength of ≧50 lbf/in, warp linear mass density within the range of 70-230 deniers, and fill linear mass density within the range of 70-230 deniers. 3. The system of claim 1, wherein the remaining thin film of the second resin matrix has a thickness of about 2%-15% of the original thickness of the peel ply prior to removal. 4. The system of claim 1, wherein the resin composition comprises at least one epoxidized novolac resin represented by the following structure: wherein n is an integer from 0 to 8, R═H or CH3. 5. The system of claim 4, wherein the resin composition further comprises a dicyclopentadiene-containing novolac epoxy resin represented by the following structure: wherein n=an integer from 0 to 7. 6. The system of claim 1, wherein said woven fabric has a fabric weight within the range of 50-250 gsm. 7. The system of claim 6, wherein said woven fabric has a fabric weight within the range of 70-220 gsm. 8. The system of claim 1, wherein said woven fabric has a fabric thickness in the range of 50-250 μm. 9. The system of claim 8, wherein said woven fabric has a fabric thickness in the range of 100-200 μm. 10. The system of claim 1, wherein the yarns of the woven fabric are made of materials selected from the group consisting of: polyesters, polyethylene, polypropylene, nylon, elastomeric materials, polyaramids, polyimides, polyethyleneimine (PEI), polyoxazole, polybenzimidazole (PBI), polyether ether ketone (PEEK), and glass. 11. The system of claim 1, wherein said peel ply has a resin content within the range of 20%-50% by weight based on the total weight of the peel ply. 12. The system of claim 1, wherein said peel ply has a glass transition temperature (Tg) of ≧140° C. 13. The system of claim 12, wherein said peel ply has a glass transition temperature (Tg) within the range of 140° C.-200° C. 14. The system of claim 1, wherein the curing agent is selected from the group consisting of BF3, BCl3, and complexes thereof. 15. The system of claim 1, wherein said second resin matrix is formed from a resin composition comprising: epoxy phenol novolac resin having epoxy functionality of at least 2;dicyclopentadiene-containing epoxy novolac resin having epoxy functionality of at least 2;diglycidyl ether of bisphenol A;triglycidyl ether of aminophenol;a curing agent selected from the group consisting of BF3, BCl3, and complexes thereof; andfumed silica. 16. The system of claim 1, wherein the novolac resins are making up at least 20% by weight based on the total weight of the composition.