Preparation And Properties Research Of High-Perfomance Rubber Damping Composites

Rubber damping materials are widely used in the field of acousticnoise reduction and shock absorber buffer. Organic smallmolecule/rubber hybrids have excellent damping properties, which hasattracted widespread attention in recent years. In this paper, hinderedphenol AO-80and sulfonamide accelerator DZ were selected as dampingagent. Nitrile rubber (NBR), Millable Polyurethane (MPU) andChlorobutyl rubber (CIIR) were selected as polarity damping rubbermatrix. The methods of organic small molecule/polymer hybrids theorytogether with rubber blending theory, small molecules combined wereused to prepare rubber damping composites, and AO-80/MPU, AO-80/NBR/MPU, AO-80/CIIR/NBR, DZ/NBR, DZ/AO-80/NBR weresuccessfully prepared at first time. We mainly study the dynamicmechanical properties with the help of thermal performance analysis andmorphology analysis. The effect of small molecules and its amount ondamping and mechanical properties of composites were systematicallyinvestigated. The influence of carbon black (N330) reinforcement andheat-aging on damping and mechanical properties were also tested. Maincontent of this paper as follows: All of the AO-80/MPU hybrids had only one tanδ peak. Withincreasing of AO-80, The glass transition temperature (Tg) correspondingto the soft segments of MPU and loss factor (tanδ), the effective dampingtemperature ranges (tanδ≥0.3), tanδ area (TA) all were increasedremarkable, and also, the peak location shifted to higher temperature.Compared with neat MPU, the peak values (tanδmax) of AO-80/MPU(80/100) composites was up to1.51, increased more than onetime, which shows an excellent damping properties; Aging on thedamping properties was not even change in addition to the loss peakslightly shift to higher temperature.The AO-80/CIIR/NBR composite shows the typical sea-islandmicrostructure, CIIR is the dispersed phase, NBR is the continuous phase,there are two Tg and tanδ peak corresponding to the two phaserespectively. Compared With CIIR/NBR (30/70), the sea-island structureof AO-80/CIIR/NBR（80/30/70）changed significantly, especially thedispersed phase changed from strip band into round. With the increasingof AO-80, Tg, tanδmaxcorresponding to NBR was increased remarkableas well as TA, the peak location prominently shifted to highertemperature, which shows excellent damping properties; The tanδmaxofAO-80/CIIR/NBR（80/30/70） composites was up to2.02, increasedalmost70%comparing with CIIR/NBR（30/70）. The composite showstensile orientation characteristics, which greatly enhance the tensilestrength with the addition of the AO-80, The tensile strength of AO-80/CIIR/NBR（60/30/70） was up to10MPa, improved one time morethan CIIR/NBR（/30/70）; The tanδmaxstill greater than1.0of the AO-80/CIIR/NBR（40/30/70）composite when the mount of N330is50phr,N330had even no influence on the effective damping temperature ranges; With the increasing aging time, The tanδ peak move to high temperature,but the other damping parameters have even no change at all.DZ/AO-80/NBR composites show a single Tg and tanδ peak. The Tg,tanδmaxincreased, the loss peak shifted to higher temperature with theincreasing of DZ. The temperature range of tanδ≥0.3improved10℃when the AO-80amount is20phr. Combined DZ with AO-80used inNBR significantly improved damping performance. The elongation stressof the DZ/AO-80/NBR system improved significantly, DZ/AO-80/NBR(20/40/100) emergence the phenomenon of stretch orientation, the tensilestrength substantially increased almost one time more than the originalone.