VERFAHREN ZUR HERSTELLUNG EINER DUROPLASTISCHEN PRESSMASSE AUS GLASFASER-POLYESTER-VERBUNDWERKSTOFF

摘要

A process is proposed for the preparation of a thermosetting compression-moulding compound from a glass fibre/polyester composite material, in particular SMC, BMC or DMC. Waste parts 1 from compressed SMC, BMC or DMC are comminuted in a comminuter 3, where the glass fibre/polyester composite structure breaks up mechanically. The glass fibres recovered in this way are separated from the pulverulent recycling fraction in a vibrating screen (sieve) 5 and subjected to a specific surface treatment. Wetting agents are added to the pulverulent recycling fraction. In the preparation of the novel thermosetting moulding compound, the pulverulent recycling fraction obtained is incorporated into the resin paste as recycling filler. The recycled glass fibres substantially replace the original glass fibres otherwise required. Recycling SMC prepared by the process using waste parts contains up to 40% of recovered pulverulent recycling fraction and up to 40% of recycled glass fibres. The mouldings pressed from this recycling SMC have virtually the same good technical properties as mouldings made from original SMC.