The aim
of this work is to introduce a novel chemical recycling approach
forpolyurethane foam wastes which can produce useful chemicals.
Flexiblepolyurethane foam was dissolved in a mixture of diethylene
glycol (DEG) andpentaerythritol (PE).
PER is a useful choice in recycling processes because of its OHfunctional groups and its structural similarity to polyols. Meanwhile, there are severa lenvironmental advantages for chemical recycling of polyurethane foam wastes due to the capabilities of the above method.
The transesterification process cleaves the urethane structure, producing OH containing chemicals. The product is separated in 2phases which are both useful in the production of new PU foams. The split product was characterized by several analytical methods, e.g., chromatography and spectroscopy.Optimum reaction condition and the role of recycled polyol on foam properties were investigated, as well.
The solvent system contained DEG/PER as 9/1 ratio. Sodiumhydroxide was used as the catalyst and the optimum reaction time was 4 h. Separated phases of the product are reusable in polyurethane foam formulation: upper phase inflexible (40%) and lower phase in rigid (30%) foams to obtain desirable physical properties in the final product.
This method can be introduced as a route for reductionof environmental hazardous materials, while regenerating valuable raw materials.
PER is a useful choice in recycling processes because of its OHfunctional groups and its structural similarity to polyols. Meanwhile, there are severa lenvironmental advantages for chemical recycling of polyurethane foam wastes due to the capabilities of the above method.
The transesterification process cleaves the urethane structure, producing OH containing chemicals. The product is separated in 2phases which are both useful in the production of new PU foams. The split product was characterized by several analytical methods, e.g., chromatography and spectroscopy.Optimum reaction condition and the role of recycled polyol on foam properties were investigated, as well.
The solvent system contained DEG/PER as 9/1 ratio. Sodiumhydroxide was used as the catalyst and the optimum reaction time was 4 h. Separated phases of the product are reusable in polyurethane foam formulation: upper phase inflexible (40%) and lower phase in rigid (30%) foams to obtain desirable physical properties in the final product.
This method can be introduced as a route for reductionof environmental hazardous materials, while regenerating valuable raw materials.
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