Preparation and Properties of Rubber Blends for High-Damping-Isolation Bearings

Abstract

To improve the energy dissipation capacity of rubber isolation bearings, it is important to find a new rubber material with good applicability and high damping properties. Two types of blends were prepared using nitrile rubber (NBR), brominated butyl rubber (BIIR) and ethylene-vinyl acetate copolymer (EVA): NBR/BIIR and NBR/BIIR/EVA. The vulcanization, mechanical and damping properties of the blends were analyzed. The results show that both blends exhibit excellent vulcanization plateaus and mechanical properties. For NBR/BIIR, as the BIIR content increases, the complementary effects of NBR and BIIR afforded by blending are enhanced. Two damping peaks appeared in the tanδ-T curve and shifted toward lower and higher temperatures, respectively, which clearly widened the effective damping temperature range. However, the damping value in the valley of the tanδ-T curve was as low as 0.39. For NBR/BIIR/EVA, the addition of EVA greatly increased damping in the valley of the tanδ-T curve to approximately 0.54. EVA was observed to be the optimal polymer for improving the compatibility of the NBR/BIIR blend. Moreover, hot air thermal aging tests showed that both blends demonstrated good stability.

Research and Development of High-Performance High-Damping Rubber Materials for High-Damping Rubber Isolation Bearings: A Review

“…At present, rubber blending and interpenetrating polymer network (IPN) technologies are two relatively mature technical tools, to broaden the effective damping temperature range of rubber materials [29]. Though IPN technology can be used to synergistically combine polymer materials with different properties and form new polymer materials with high mechanical properties [30], the rubber synthesis process using IPN technology is complex and cost-intensive, which greatly limits the application of IPN polymers, as structural damping materials, in the production of high-damping rubber isolation bearings [31].…”

Wide temperature range damping polyurethane elastomer based on dynamic disulfide bonds

“…To broaden the effective damping temperature range of viscoelastic damping materials, the research mainly focuses on physical blending, 10–15 interpenetrating polymer network, 16–19 compositing, 20–23 hybridizing organic small molecule, 24,25 introducing dangling chains 26,27 and so on. These methods have certain effects on improving the damping performance of materials, but there are still problems needed to be solved, such as narrow temperature range and lack of predictability, or low mechanical strength.…”

Development of vibration damping materials based on butyl rubber: A study of the phase equilibrium, rheological, and dynamic properties of compositions

“…A literature analysis shows that such materials include butyl rubber (isobutylene–isoprene copolymer, BR), polyisobutylene (PIB), their mixtures, chlorinated BR, BR reclaim, ethylene propylene diene monomer (EPDM) rubber, and polyurethane as polymeric components; various types of highly refined mineral oil (HRMO), industrial oil, aromatic petroleum oil, epoxidized sunflower oil (ESFO), soybean oil, and so on as plasticizers; chalk, talc, kaolin, shungite, carbon black, wood flour, cotton comber noil, foil powder, and so on, as fillers of various dispersion degrees; polyolefins of different nature, ethylene–vinyl acetate (EVA) copolymers, various bitumen, and so on. as processing aids; phenol‐formaldehyde, aldehyde, and polyester resins, rosin and its esters as modifying agents 3–22 . Vibration damping compositions usually also include components that increase cold and heat resistance, adhesion, physico‐mechanical, and other properties.…”