Method for separating PVC (Polyvinyl Chloride) and PS (Poly Styrene) from mixed waste plastic
A technology of mixing plastics and waste plastics, which is applied in the field of polystyrene and polyvinyl chloride, and can solve the problems of low dissolution rate, low efficiency and slow dissolution speed of PVC plastics, and achieve less pollutants, high efficiency and good effect Effect
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Embodiment 1
[0040] Add mixed plastic A with a particle size of 4 mm into the methyl ethyl ketone solvent, and the ratio of plastic to solvent is 0.1 g / ml. At a temperature of 70°C, stir mechanically for 60 minutes. Filter the solution with a 150-mesh screen, and dry the filtered residue to obtain PVC-free plastic; evaporate the filtrate at a temperature of 80°C, dry the precipitated solute to obtain PVC plastic, and recycle the evaporated methyl ethyl ketone solvent. The test conditions and results are listed in Table 1. As can be seen from Table 1, the removal rate of PVC is 96.2%.
Embodiment 2
[0042] Add mixed plastic A with a particle size of 10 mm into dimethylformamide solvent, and the ratio of plastic to solvent is 0.1 g / ml. At a temperature of 90°C, stir mechanically for 50 minutes. Use a 150-mesh screen to filter the solution, and dry the filtered residue to obtain PVC-free plastic; evaporate the filtrate at a temperature of 150°C, dry the precipitated solute to obtain PVC plastic, and circulate the evaporated dimethylformamide solvent use. The test conditions and results are listed in Table 1. As can be seen from Table 1, the removal rate of PVC is 96.1%.
Embodiment 3
[0044]Add mixed plastic A with a particle size of 30 mm into the cyclohexanone solvent, and the ratio of plastic to solvent is 0.1 g / ml. At a temperature of 90°C, stir mechanically for 50 minutes. Filter the solution with a 150-mesh screen, and dry the filtered residue to obtain PVC-free plastic; evaporate the filtrate at a temperature of 150°C, dry the precipitated solute to obtain PVC plastic, and recycle the evaporated cyclohexanone solvent. The test conditions and results are listed in Table 1. As can be seen from Table 1, the removal rate of PVC is 95.6%.
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