Thermoforming technology

For some thermoset polyurethane wastes with a low degree of crosslinking, it has a certain thermosoftening plasticity between 100-200°C. Within this problem, heating and pressurization can be directly bonded together without the use of adhesives.

The elongation at break and surface properties of the recycled products prepared by this method are relatively poor, and are generally suitable for products that only require good dimensional stability, heat resistance and aging resistance. This method is suitable for situations where the waste composition is known.

Extrusion technology

Extrusion molding is a product in which polyurethane regrind is added to the screw, and the polyurethane macromolecular chain is cut to a medium-length molecular chain through the heat and shear force of the screw, and the rigid polyurethane material can be transformed into a soft plastic polyurethane material by this method. And for those soft polyurethane foam waste can be directly crushed and then injection molded. For example, injection directly to make shoe soles and other products.

Other

The waste in production is cut into small pieces and used as packaging cushioning filling material or bedding, etc directly. Polyurethane foam can also be used as artificial soil and natural soil covering. In open-cell flexible polyurethane foam, water and chemical fertilizers are added to cultivate a wide range of plants, in which plants grow quickly and are free of pests, diseases and weeds.

At present, there is no most effective solution for the recycling of polyurethane. The main reason is that due to the different varieties of polyurethane, the components are extremely complex, and the physical and chemical properties are diverse, resulting in the specificity of its products.

The physical recycling of polyurethane has high production efficiency, simple operation and less secondary pollution. However, the performance of the product is poor, and it can only be downgraded and utilized, and the economic benefits are low, so more in-depth research should be carried out in improving the product performance in the future. Strive to improve the efficiency of recycling.