Abstract
Because phenolic resins are far superior to many thermoplastics in heat resistance, electrical insulation and fire resistance, they are applied to auto-parts, electrical appliances and mechanical parts, etc. But their wastes can not be remelted for recycling and voluminous ones are dumped at landfill sites. We have two purposes on this study : one is to mix the wastes with virgin compounds to make recycled plastics; another is to reuse them as a filler for thermoplastics. The results obtained are as follows : (1) The suppression of generating dust particles could be attained by adding alcohol at mixing crushed materials with virgin compounds. (2) Injection moulding was tried using the recycled plastics which contained 30 wt% crushed materials. This gave us satisfactory results in appearance, mechanical property, and moldability. (3) Reuse of the wastes as a filler for thermoplastics was also tried. The heat distortion temperature of the resultant resins was improved by 3 %, compared with that of polystyrene moulding materials, though their tensile strength and flexural stress decreased with increasing content of the wastes. (4) It was confirmed that this recycling technology could be put to practical use and would contribute toward reduction of environmental burdens.
