Thermoplastic prepregs and composites

Fecha de publicación: 27/01/2021
Fuente: WIPO "hemp"
Preferably the dispersion comprises 0.25-5 wt.% sulfonated polyaryletherketone (PAEK) surface active agent and particles of the equivalent (but non-sulfonated) PAEK in water. Preferably the PAEK powder is PEK, PEEK or PEKK having number median diameter (D50) ≤ 50 µm. Preferably the surfactant has degree of sulphonation = 0.5-1.5. A prepreg is formed by passing fibres through a bath containing the dispersion. The sulphonate groups are preferably removed during drying or moulding of the prepreg. The preferred prepreg comprise yarns comprising 3000-48000 filaments measuring 6-10 µm. The preferred prepreg comprises 35-75 wt.% carbon fibre reinforcements (CFRP). Alternative fibers are glass, quartz, graphite, silica, steel, aluminium, boron, silicon carbide, boron carbide, aramid, polyethylene, polyester, poly(p-phenylene benzobisoxazole), hemp, linen or silk. The prepregs are used in aerospace, automotive, wind energy and sporting goods industries.