Mfg. composites having improved mechanical properties - by forming homogeneous mixt. of thermoplastic fibres and ultrafine reinforcing fibres in non-solvent liq., forming and hot-pressing

摘要

Composites (I) are prepd. by (1) forming in a liq. phase a homogeneous mixt. of (A) thermoplastic fibres, (B) reinforcing fibres with dia. 0.001-7 microns, (2) preparing a web, (3) forming (I) by hot-pressing this web, opt. (C) other components being added to (A) and/or (B) or to web prepd. from (A) and (B). Pref. the liq. phase is water, alcohol, chlorinated hydrocarbon, alkane or aromatic in which neither (A) nor (B) dissolves. (A) are of metal, metal alloy, glass, organic material, thermoplast and/or thermoplastic reactive system. (A) have dia. 0.1-300 microns. (B) are of microglass fibres, C, steel, brass, Cu, Al, metal nitride, metal carbide, metal oxide, silicate and/or organic polymer. (B) have dia. 0.1-5 microns. (B) are sized. (B) comprise 5-95% (all pts. wt.) on total fibres. (C) is surface-modifying agent, wetting agent, dispersant, kaolin, talc, chalk, quartz flour, processing aid, antiageing agent and/or release agent. Web is pressed under 0.5-500 bar at 70-2000 deg.C. ADVANTAGE - (I) have improved mechanical properties through better distribution of (B) in matrix and better coupling of (B) to matri