Chemo-mechanical stripping of paint from plastic parts

Details Chemo-mechanical stripping of paint from plastic parts Chemo-mechanical stripping of paint from plastic parts

1994-12-27

1996-11-26

El-Arini, Zeinab

Cleaning and liquid contact with solids

Processes

Using solid work treating agents

134 38, 134 10, 134 16, 134 19, 134 251, 134 29, 134 36, B08B 310, B08B 702, C23D 1700

Patent

active

055781357

ABSTRACT:
A process for stripping of used parts or reject parts, in particular of polycarbonate (PC) or of a polycarbonate blend, preferably with polybutylene terephthalate (PBT/PC), for the purpose of recycling the plastic. In this process the plastics parts are first mechanically comminuted to a pourable size and then are circulated together with anhydrous alkalified diethylene glycol or propylene glycol in a mass with mutual abrasion of the plastics chips at elevated temperatures of at least 50.degree. C., preferably from 80.degree. to 100.degree. C., until complete removal of the paint. Thereafter the stripped plastics chips are separated from the stripping agent, flushed and then dried. The quantity of glycol added corresponds to from 1 to 10% of the volume of the mass to be treated, so that the circulated parts are only wetted by the glycol, but with stripping agent being circulated continuously through the treatment space of the mass from a relatively large reservoir. The circulation of the mass of parts is preferably carried out in a closable free-fall or positive mixer or in a rotary tube mixer. During the abrasive circulation the plastics parts are preferably admixed with abrasive particles whose specific apparent density corresponds roughly to the specific apparent density of the plastics parts.

REFERENCES:
patent: 4379724 (1983-04-01), Kashiwagi
patent: 5094696 (1992-03-01), Orsen
patent: 5234504 (1993-08-01), Peterson et al.
patent: 5255859 (1993-10-01), Peacock et al.
patent: 5330581 (1994-07-01), Syrinek
patent: 5372650 (1994-12-01), Lahoda et al.
European Search Report dated May 8, 1995.

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