Abstract
Refrigerated enclosures - refrigerators, refrigerated units, vans for transporting perishable goods are thermally insulated with polyurethane foam. The insulation process involves the pressure injection of the component reactants into the spaces to be insulated. Following the polyaddition reaction, the foaming-expansion process takes place with an increase in volume. Finally, a spongy polymeric mass is obtained, which filled the spaces where insulation had to be carried out and which also generated an excess of material which is subsequently removed by mechanical means. Excess material results from the initial dosage of the insulation material and must exist to ensure that the spaces to be insulated are completely filled. Polyurethane foam waste is a real problem for several reasons. With a large volume, it takes up a lot of storage space with unpleasant consequences, polyurethane foam is a slightly non-degradable reactive material that persists in the environment. The combustion of polyurethane foam waste is not an option to be adopted because the combustion, in addition to CO2, also results a series of particularly toxic substances: isocyanates, phosgene, cyan.
Highlights
Modern construction technologies have abandoned the old system of partitioning through walls, with the creation of fixed spaces, well determined, non-removable with or without connection between them and have adopted the process of partitioning through removable walls that are easy to assemble and disassemble just as
The disadvantages of these panels are the friability and the reduced capacity of sound absorption. in buildings where activities in various fields are carried out, silence is a mandatory attribute. This disadvantage is removed by the product which is the subject of this patent application, a complex structure of layered panel which consists of two upper layers of gypsum that are connected to each other by a granulated polyurethane foam filling, obtained by grinding polyurethane foam waste resulting from the technological processes of insulation of refrigeration enclosures
The inner layer has the role of sound absorption - especially of those with low frequency, and being elastic and adherent to the gypsum board to reduce its friability reducing the risks of accidental breakage of gypsum boards during transport or installation
Summary
Modern construction technologies (especially in the case of office buildings) have abandoned the old system of partitioning through walls, with the creation of fixed spaces, well determined, non-removable with or without connection between them and have adopted the process of partitioning through removable walls that are easy to assemble and disassemble just as . The disadvantages of these panels are the friability and the reduced capacity of sound absorption. In buildings where activities in various fields are carried out, silence is a mandatory attribute This disadvantage is removed by the product which is the subject of this patent application, a complex structure of layered panel which consists of two upper layers of gypsum that are connected to each other by a granulated polyurethane foam filling, obtained by grinding polyurethane foam waste resulting from the technological processes of insulation of refrigeration enclosures. The sound-absorbing material is ground polyurethane foam, recovered from the technological waste resulting from the processes of obtaining refrigerators, insulating metal panels, pre-insulated pipes, waste difficult to destroy by ecological processes
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