NBR/CR‐Based High‐Damping Rubber Composites Containing Multiscale Structures for Tailoring Sound Insulation

Abstract

High-damping acoustic composites with unique sound insulation feature is reported, demonstrating surprisingly stable soundproof properties over a wide bandwidth of frequency (63-6300 Hz) with good mechanical properties. The extraordinary acoustic properties are attributed to the multiscale synergy of lamellar and hollow structures by multifillers adding. The acoustic composites are designed and fabricated through a low-temperature one-time rubber mixing process using nitrile butadiene rubber(NBR), chloroprene rubber (CR) as matrix and mica powder (MP), hollow glass beads (HGB), and montmorillonite (MMT) as multifillers. The soundproof mechanism is discussed in detail. Results indicate that the synergism of damping and sound absorption behaviors in the composition has a considerable impact on the acoustic characteristics, which can be controlled by the blending ratio of NBR/CR matrixes and the multiscale structures of MP/HGB/MMT multifillers. The designed multifillers acoustic composites can adapt to broadband engineering noise control including walls in express train constructions, panels of vessel or aircraft cabins, and large transportation pipelines.

Self‐foaming polyurea foams reinforced by nano SiO2 via a non‐isocyanate route

“…Similar to the results in compression tests, the storage modulus ( E' ) of PUrFs in DMA measurement increases with the rise of nano SiO 2 content (see Figure 8). The peak values of tan δ for all PUrFs are similar at about 1.3 and effective damping temperature range (tanδ > 0.3) 40 is 25–65°C. It can be concluded that these PUrFs exhibit high damping performance.…”

Formulation and Performance of NBR/CR-Based High-Damping Rubber Composites for Soundproof Using Orthogonal Test

“…The orthogonal experiment was carried out by adopting four factors and five levels, totaling 25 groups of test, as explained in Table 1. For the detailed process and method of composite materials, the reader can refer to our previous research and work [26]. Tensile strength was determined with a TS 2005b tensile testing machine (U-CAN Dynatex Inc., Taiwan, China).…”

“…In our previous work, the sound insulation properties of six kinds of rubber were investigated in detail, and results showed that a combination of nitrile butadiene rubber (NBR) and chloroprene rubber (CR) had excellent damping and sound insulation properties. In addition, fillers such as montmorillonite (MMT), hollow glass beads (HGB), barium sulfate (BaSO 4 ), and mica powder (MP) were beneficial to the soundproof properties of rubber composites [26].…”

Preparation and application of high sound insulation polyurethane composite film through glass fiber reinforcement

“…[6][7][8][9][10] Adding the thickness and number of glass layers could improve the sound insulation performance of the components, but it would also lead to augment cost and weight. [11][12][13] Vacuum glass and insulating glass can improve the sound insulation effect of the building, but the sound insulation performance is limited and it may increase safety risks. 14 The sound insulation and mechanical properties of epoxy (EP)/hollow silicon nanosphere composites were investigated; sound insulation can be achieved without sacrificing the mechanical properties of the composite material by incorporating nanometer hollow particles to create small spaces in the EP resin.…”