Characterization of polyurethan skin agglomerates for acoustic insulation from impact noise

Abstract

Polymeric materials are greatly used in industry due to their versatility in application generating therefore, large quantities of solid waste. Population growth in urban areas, with living quarters mainly in residential buildings, face discomfort caused by noise, particularly by impact noise. Aiming at reducing the amount of polymeric material disposed of in the environment and at providing alternatives of reuse, together with the possibility of reducing noise impact from construction works, agglomerates of polyurethane skin (PUs) have been developed. The recycling process of PUs was developed through variations in particle size and pressing temperature of agglomerates. PU agglomerates of coarse particle size, hot pressing process and close cell structure presented reductions in noise level up to 20 dB, showing that it is suitable for acoustic insulation.

Adsorção De Íons Cádmio Por Derivados Carboximetilados E Sulfatados De Quitosana

“…Low density foams are best for sound insulation, due to the large amount of air and voids existing its internal cellular structure. However, more dense materials are more appropriate for sound absorption, because the sound speed tends to decrease according to increasing the density of a material, because it's absorbed and converted to molecular movements of the material while trying to pass through the same 34 . There's still a need for an appropriate balance between the mechanical and acoustic properties, that can be explained by the relationship between PU's density and resilience, when the bigger the density, the bigger will be the material's elasticity dynamic modulus, thereby, better resilience and bigger density result in a good noise impact insulation properties.…”

Implementação da norma de desempenho NBR 15575:2013: estudo de caso em Recife/PE

“…Por meio destes instrumentos foi possível entender detalhadamente as ações desenvolvidas e as dificuldades vivenciadas para implementar a NBR 15575:2013. GARLET et al, 2017;SILVA, 2017;MUNIZ-GÄAL et al, 2018;SILVA et al, 2018;TUBELO et al, 2018;DALBEM et al, 2019Desempenho Acústico RIBEIRO et al, 2014SCHVARSTZHAUPT;NUNES, 2014;ZANNIN, 2016;GARLET et al, 2017;PACHECO et al, 2017;SANTANA et al, 2017;KLIPPEL FILHO et al, 2018;SILVA et al, 2018Resistência ao fogo BOLINA et al, 2015BOLINA et al, 2017;HENNEMANN et al, 2017;KLIPPEL FILHO et al, 2018 Entre os documentos analisados destacaram-se padrões e registros dos sistemas de gestão da qualidade, checklists de projetos de arquitetura e engenharia e resultados de ensaios e simulações realizadas pelas empresas. Os dados obtidos foram compilados, triangulados e analisados criticamente de forma a caracterizar e permitir a avaliação da implementação da norma de desempenho.…”

Acoustic Behavior of Subfloor Lightweight Mortars Containing Micronized Poly (Ethylene Vinyl Acetate) (EVA)

“…In addition to particle size, the hot or cold press process also influences, the cold processes leading to better acoustic performance since the integrity of polymer materials is maintained [ 5 ].…”