PEEL PLY, METHOD OF SURFACE PREPARATION AND BONDING COMPOSITE STRUCTURES USING SAME Russian patent published in 2016 - IPC B29C70/54 

FIELD: chemistry.

SUBSTANCE: invention relates to a peel ply system for surface preparation of various composite substrates method for preparing surface of such substrates and to a method of producing related composite structure. Disclosed peel ply system for surface preparation of various composite substrates, comprising a composite substrate comprising reinforcing fibres impregnated with a cured, first resin matrix, and a removable, resin-rich peel ply adhered to a surface of composite substrate. Peel ply comprises a woven fabric impregnated with a cured, second resin matrix different from first resin matrix. Upon manual removal of peel ply from composite substrate's surface, a thin film of second resin matrix remains on composite substrate's surface to provide a bondable surface capable of co-bonding and secondary bonding with another composite substrate. Second resin matrix is formed from a resin composition comprising epoxidised 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 and inorganic filler particles.

EFFECT: high reliability and efficiency of binding composite structure.

19 cl, 8 dwg, 1 tbl, 9 ex