Recycled plastic moulding materials - contain recycled polyamide, recycled fibre-reinforced crosslinked polyester resin, opt. modified ethylene@ copolymer and opt. additives

摘要

Recycled plastic moulding material (I) contains (A) 100 pts. wt. recycled polyamide, (B) 5-100 pts. wt. recycled thermoset contg. crosslinked plastic and reinforcing fibres, (C) 0-40 pts. wt. acid gp.- and/or diene gp.- and/or ester gp.-contg. ethylene copolymer and (D) 0-60 pts. wt. normal additives for plastic mixts. Prodn. of (I) comprises melting opt. pulverised (A), opt. with (C), in an extruder, adding pulverised (B) (opt. together with D), homogenising the mixt. and extruding. Pref., (B) contains 20-80 wt.% thermoset, pref. crosslinked UP resin, 10-40 wt.% fibres, pref. glass fibres and 0-70 wt.% filler, pref. chalk. Pref. (B) is used in the form of plastic-coated fibres or fibre bundles with mean length 0.2-1.0 mm, or finely-ground particles with mean dia. 20-100 microns. USE/ADVANTAGE - Used for the prodn. of tubes, profiles, sheet and injection mouldings (claimed). The mechanical properties of recycled polyamide are improved by addn. of recycled reinforced thermoset (B), so that the mixt. can be moulded to give prods. with adequate mechanical properties, esp. rigidity and strength.