On the impact of silica and black carbide in improving the anti-vibration of the rubber blends based on natural rubber (NR) and styrene butadiene rubber (SBR)

This paper presents some results on the survey of the impact of silica and black carbide on the mechanical – physical properties and vibration resistance of the rubber blended on natural rubber (NR) and synthetic styrene butadiene rubber (SBR), for application in manufacturing diesel engine mounts.
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On the impact of silica and black carbide in improving the anti-vibration of the rubber blends based on natural rubber (NR) and styrene butadiene rubber (SBR)Vietnam Journal of Science and Technology 56 (2A) (2018) 17-23 ON THE IMPACT OF SILICA AND BLACK CARBIDE INIMPROVING THE ANTI-VIBRATION OF THE RUBBER BLENDS BASED ON NATURAL RUBBER (NR) AND STYRENE BUTADIENE RUBBER (SBR) Le Ngoc Tu1, *, Chu Chien Huu1, Nguyen Huy Truong2, Dang Ngoc Son2 1 Institute of Chemistry and Materials, Vietnam Academy of Military Sciences and Technology, 17 Hoang Sam St., Cau Giay District, Ha Noi 2 Institute of Military Mechanical Technology, 42 Dong Quan Road, Cau Giay District, Ha Noi * Email: Lengoctu66@gmail.com Received: 30 March 2018; Accepted for publication: 10 May 2018 ABSTRACT This paper presents some results on the survey of the impact of silica and black carbide onthe mechanical – physical properties and vibration resistance of the rubber blended on naturalrubber (NR) and synthetic styrene butadiene rubber (SBR), for application in manufacturingdiesel engine mounts. Based on this research, the article also introduces some results in buildingup anti-vibration rubber and the process of diesel engine mounts manufacture. Development ofthe method to test the vibration resistance of the diesel engine mounts has initially resulted insome good results such as the natural frequencies are lower than 20 Hz and the damping factor ishigher than 10.Keywords: anti-vibration rubber, engine mounts. 1. INTRODUCTION Engine mount is a typical anti-vibration product made from rubber [6]. The engine mount isdesigned to link the engine and the vehicle body. It must achieve a vibration reduction effect(avoiding resonant frequencies) while reducing the impact force on the chassis as well asdisplacement to the lowest level. In order to meet these requirements, manufactured rubber mustachieve elastic characteristics and mechanical properties that ensure the bearing is stable enoughfor a long time. To increase the life of the product, it is necessary to increase the durability of therubber, reduce the hardness and hence the resonant frequency, increase the anti-vibrationresistance for the support. Factors affecting the hardness of the rubber are network density,powdered content, plasticizers, reinforcing agents, etc. In this paper, we present some results onthe impact of filler (carbon black and silica) to vary the shake resistance of NR and SBR/NRblend. Le Ngoc Tu, et al. 2. EXPERIMENT2.1. Materials, chemicalsThe materials for the study include:- Anti-vibration rubber bearing on NR basis.- Anti-vibration rubber pillow on SBR/NR blend.- All kinds of materials and chemicals for making anti-vibration rubber pillow include:+ Natural rubber, RSS1 (Vietnam).+ Styren butadien rubber, SBR 1502 (Korea).+ Promoters (M, D), Activator (ZnO, Axitstearic), fillers (carbon black N330, SiO 2), anti-agingsubstances (4020, RD), etc. are the basic chemicals used in rubber industry.+ Silica made in Vietnam with the parameters as indicated in Table 1 [4]. Table 1. Specification of the made silica in the study. No Specifications Unit Results 1 Content SiO2 % ≥ 86 0.10- 2 Specific weight g/cm3 0.25 3 Moisture at 1050C % 3-5 Loss on heating at 4 % 8-14 10000C 5 pH of suspension 5% 6.5-8 Left on 325 mesh sieve 6 % ≤ 12 (dry sieve) 7 Total Chlorine % ≤ 0.22 8 Private surface m2/g > 1102.2. Measurement methods, measurement standards- Fabrication of mechanical samples according to TCVN 1592: 2007, manufacture of chemicalsamples according to TCVN 4855: 2008 by cutting and grinding machines;- Rubber hardness testing according to TCVN 1595-1: 2007 with LX-A (China);- Tensile strength testing according to TCVN 4509: 2006 with UT-2080 (Taiwan);- Elongation test when pulled out according to TCVN 4509: 2006 with UT-2080 (Taiwan);- Check compression deformation according to TCVN 5320-1: 2008 at 700C in 24 h.- Check th level of aging according to TCVN 2229: 2007 at 700C in 96 h.- Vibration test according to ASTM E756-05 [3] Vibration Exciter - i230, IMV Corporation,Japan).18On the impact of silica and black carbide in improving the anti-vibration of the rubber blends …2.3. Application and rolling process, product vulcanization During the study, we found the blend of natural rubber with styrene butadiene rubber wasvery good for anti-vibration characteristics. NR deformation, which can generate high heat whenworking due to large molecular weight [1]. Mixing NR and SBR will increase the mechanicalstrength of the system, especially the resilience. On the other hand, these two types of rubberhave molecular structure, polarization and have the same vulcanization system, so it is easy tomix. In some ...