摘要:
The present invention concerns a process for the production of injection moulded glass fibre reinforced composites from extruded glass fibre reinforced pellets, said process comprising the following steps: (A) Providing: (a) Glass fibres (2) coated with a silane based sizing composition, said silane based sizing composition comprising at least one sizing reactive moiety, A1, A2, , (b)A thermoplastic matrix polycondensate (2) comprising a first matrix reactive moiety, B1, at a first end of the chain and a second matrix reactive moiety, B2, at a second end of the chain, , (c) A salt (3) selected among an internal lubricant and a nucleating agent comprising a salt reactive moiety, C, capable of reacting with the at least one sizing reactive moiety, A1, A2, and/or with the first or second matrix reactive moiety, B1, B2, said salt reactive moiety, C, being selected among, • A metallic cation , • An organic portion having a functionality, f = 1, with a reactive moiety selected among the anionic form of a carboxylic group or a hydroxyl group, and • An inorganic anion such as carbonate or sulphate,
(B) Blending the glass fibres, thermoplastic matrix polycondensate, and salt; (C) Forming glass fibre reinforced pellets; and (D) Injection moulding a composite part with a composition comprising the reaction product of said glass fibres, thermoplastic matrix polycondesate and salt
Characterized in that, the salt is added to a blend of thermoplastic matrix composite and glass fibres only after the first and/or second matrix reactive moieties, B1, B2, and the at least one sizing reactive moiety, A1, A2, are given time to react together at least partially.
摘要:
The invention relates to an aqueous sizing composition for reinforcing charges, preferably glass fibers, comprising a silane coupling agent, an epoxy film forming polymer comprising 2-8 reactive epoxy groups per chain and compatible with thermoplastic polyester matrix resin selected from PET and PBT, and a hypophosphite in an amount of 5 to 30 w% of the composition, preferably 7 to 25 w%, more preferably 10 to 20 w% and most preferably 12 to 18 w% of the composition. A thermoplastic polyester resin reinforced with glass fibers coated with a sizing composition of the invention shows improved resistance to staining and improved tensile elongation at break. The sizing composition further improves processability of the sized fibres.
摘要:
The present invention provides an impregnation system suitable for impregnating filaments continuously with an impregnating substance, said system may comprise an impregnation assembly comprising (a) at least one axial passageway for the filaments having an entrance end and an exit end and (b) at least one passageway for the impregnating substance having at least one inlet for the impregnating substance and at least two outlets for the impregnating substance leading into the passageway for the filaments via the outlets for the impregnating substance, wherein the passageway for the filaments has an oblong cross- section at the outlet point for the impregnating substance, and the at least two outlets for the impregnating substance have an oblong cross-section, and are disposed essentially opposite to each other, at the opposite widths of the passageway for the filaments. Thus, the present invention proposes an in-line system for manufacturing continuous fiber reinforced thermoplastic structure which comprises a simple device to provide strands in spread filaments form without using high friction or tension on the strand or filaments so as to ease the impregnation step and to allow higher line speeds and lower cycle times.
摘要:
The present invention concerns a sizing composition for glass fibres comprising: (a) A silane based coupling agent mixture, (b) A film former, (c) Additives, Characterized in that, the silane based coupling agent mixture comprises (d) At least 15 wt.% of at least one dialkoxysilane, and (e) At least 20 wt.% of at least one (meth)acryloxysilane, wherein the wt.% are measured with respect to the total active solid weight of silane based coupling agent. The present invention also concerns a polymeric composite reinforced with such glass fibres.
摘要:
The present invention concerns a bushing assembly comprising: (a) a liquid glass feeding unit arranged upstream of, and in fluid communication with, (b) a first and second tip plate assemblies (1A, 1B) extending along a longitudinal direction, arranged side by side, and each surrounded by side walls and end walls and, the first and second tip plate assemblies being separated from one another by a stiffening rib structure (21) extending along said longitudinal direction, characterized in that, the feeding unit comprises a glass distribution manifold (2), which defines two separate fluid communication paths to the first and second tip plate assemblies (1A, 1B), and in that, the stiffening rib structure (21) forms an integral part of the floor of the manifold (2).