SBR/TRR共混胶的共混比对农业轮胎侧胶性能的影响

研究了丁苯橡胶(SBR)/轮胎再生胶(TRR)的共混胶共混比对农业轮胎侧胶性能的影响。通过对未硫化胶塑性测定、硫化特性测定、炭黑分散性测定;硫化胶基本性能测定、力学性能测定、耐磨性能测定、老化性能测定和压缩生热性能测定等来判断选择SBR/TRR共混胶较合适的共混比,以达到轮胎侧胶较好的性能。结果表明,随着再生胶用量的增加,胶料流动性增加,撕裂强度增加,拉伸强度稍下降,且其它性能也相对较好,能满足使用要求。综合比较采用配方5#(SBR/TRR共混胶共混比为40∶20)炼制成的胶料性能最好,炭黑分散性最好,屈挠性较好,生热温度较低,拉伸强度和撕裂强度均较高,耐臭氧老化和热氧老化性能较好。     

丁苯橡胶/轮胎再生橡胶用量比对农业轮胎胎面胶性能的影响

研究丁苯橡胶(SBR)/轮胎再生橡胶(TRR)用量比对农业轮胎胎面胶性能的影响。结果表明:SBR和TRR总用量为80份或SBR用量为50份时,随着TRR用量增大,混炼胶的硫化速率增大,硫化胶的耐臭氧老化性能提高;SBR/TRR用量比为30/50,20/60和10/70时,炭黑在胶料中的分散性较好;SBR/TRR用量比为10/70时,硫化胶的压缩生热较低;SBR/TRR用量比为10/70和50/0时,硫化胶的耐热氧老化性能较好;SBR/TRR用量比为10/70时,胶料的综合性能较好。     

NR/SR并用对全钢载重子午线轮胎胎面胶性能的影响

试验研究NR与SR(SBR或/和BR)并用对全钢载重子午线轮胎胎面胶性能的影响.结果表明,与单用NR相比,SR用量不超过20份的NR/SR混炼胶强度略低,硫化胶的硬度、定伸应力、拉伸强度、拉断伸长率、弹性和耐磨性能相近,拉断永久变形较小,压缩温升略高;SR用量超过20份的NR/SR混炼胶强度较低,硫化胶的300%定伸应力和撕裂强度较低,压缩温升较高,耐磨性能较好.NR与不超过30份(最好为20份)的SBR/BR(不超过20份,最好为10份)并用的全钢载重子午线轮胎胎面胶性能较好.     

纳米氧化锌对NR/SBR/BR并用胶性能的影响

研究纳米氧化锌对NR/SBR/BR并用胶性能的影响。结果表明 ,纳米氧化锌用量增大 ,NR/SBR/BR并用胶的正硫化时间缩短 ,耐磨性能和耐热氧老化性能提高 ,但拉伸强度和拉断伸长率下降明显 ;1份纳米氧化锌替代 5份普通氧化锌 ,NR/SBR/BR并用胶的拉伸强度、拉断伸长率、耐磨性能和耐热氧老化性能提高。     

硫化体系加料方式对天然橡胶/顺丁橡胶并用胶性能的影响

研究硫化体系加料方式对天然橡胶(NR)/顺丁橡胶(BR)并用胶性能的影响。结果表明:NR/BR并用胶的撕裂强度受硫化体系加料方式影响较大,邵尔A型硬度、拉伸强度和拉断伸长率对硫化体系的加料方式容忍度较高;当氧化锌、硬脂酸和硫黄全部加入BR相中时,NR/BR并用胶的耐磨性能好且大应变下的动态损耗低,综合性能较好。     

纳米凹凸棒土/炭黑复合填料对天然橡胶/丁苯橡胶/顺丁橡胶并用胶性能的影响

研究纳米凹凸棒土/炭黑N770/炭黑N330复合填料中纳米凹凸棒土/炭黑N770用量比对天然橡胶(NR)/丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶性能的影响。结果表明:采用纳米凹凸棒土/炭黑N770/炭黑N330复合填料时,随着凹凸棒土用量增大,并用胶的F_L和F_(max)增大,硫化速度减慢,物理性能、耐磨性能和耐屈挠性能提高;纳米凹凸棒土/炭黑N770用量比为30/15时,并用胶的综合性能较优异。与添加其他无机填料(陶土、轻质碳酸钙和白炭黑)/炭黑复合填料的并用胶相比,添加纳米凹凸棒土/炭黑复合填料的并用胶拉伸强度和撕裂强度较高,耐屈挠性能较好,耐磨性能稍差。     

炭黑分布对天然橡胶/顺丁橡胶并用胶性能的影响

研究炭黑在天然橡胶(NR)/顺丁橡胶(BR)并用胶中分布对并用胶性能的影响。结果表明:BR中炭黑的质量分数增大,NR/BR并用胶硫化胶的定伸应力、拉伸强度和拉断伸长率增大,耐磨性能提高,压缩生热和动态损耗因子减小,抗裂口增长性能变差;NR中炭黑的质量分数增大,NR/BR并用胶硫化胶的耐屈挠性能增强。     

炭黑N234和深冷精细胶粉对天然橡胶/顺丁橡胶轮胎胎面胶性能的影响

研究炭黑N234和深冷精细胶粉对天然橡胶(NR)/顺丁橡胶(BR)轮胎胎面胶性能的影响。结果表明:随着炭黑N234用量增大,混炼胶的门尼粘度和硫化速率增大,硫化胶的300%定伸应力和拉伸强度增大,拉断伸长率和DIN磨耗量减小,撕裂强度、压缩生热和永久变形变化不大,耐屈挠性能提高;随着深冷精细胶粉用量增大,混炼胶的门尼粘度和硫化速率增大,硫化胶的300%定伸应力和DIN磨耗量变化不大,拉伸强度和拉断伸长率减小,撕裂强度、压缩生热和永久变形呈增大趋势,耐屈挠性能下降;深冷精细胶粉部分替代炭黑应用于轮胎胎面胶中可降低原材料成本,利于环保。     

钴系BR在轮胎胎侧胶中的应用

对比研究炭黑和炭黑/白炭黑填充钴系BR0150/NR与炭黑填充镍系BR9000/NR在轮胎胎侧胶中的应用。结果表明:与炭黑填充BR9000/NR胶料相比,炭黑填充BR0150胶料的门尼粘度较小,流动性较好,正硫化时间和焦烧时间相近,硫化胶的各项性能相差不大;炭黑/白炭黑填充BR0150/NR胶料门尼粘度较大,正硫化时间延长,硫化胶的物理性能和老化性能相差不大,但撕裂强度大幅增大,抗切割性能和耐屈挠割口增长性能改善。     

石墨烯/废旧轮胎裂解炭黑在半钢子午线轮胎胎面胶中的应用

研究石墨烯(GE)/废旧轮胎裂解炭黑在半钢子午线轮胎胎面胶中的应用。结果表明:随着GE用量的增大,胶料的焦烧时间缩短,硫化速度减慢,交联密度增大;硫化胶的硬度和定伸应力增大,拉伸强度、拉断伸长率和撕裂强度均先增大后减小,拉断永久变形和回弹值减小,耐磨性能提高,压缩温升和永久变形增大;硫化胶的损耗因子(tanδ)峰值减小,0和60℃时的tanδ增大。     

Flow of carbon black loaded styrene-butadiene (SBR)-cis-polybutadiene blends through capillary dies—influence of mixing and the location of carbon black

The flow behavior of carbon black loaded styrene-butadiene (SBR)-cis-polybutadiene (BR) is investigated as a function of mixing and the location of carbon black. The blends consist of an 80:20 weight ratio of SBR and BR with the incorporation of 20 phr carbon black via three different schemes to control the location of carbon black in the individual rubber phases. These are: (A) free black mixing of the three components, (B) mixing of SBR-black masterbatch with BR, and (C) mixing of BR-black masterbatch with SBR. Dynamic Mechanical Analysis (DMA) was used to characterize carbon black distribution. The damping characteristics indicate that when carbon black is masterbatched into either one of the rubbers, it continues to remain incorporated in that particular rubber phase upon blending with the second rubber. The flow behavior is measured with an Instron capillary rheometer. The results indicate that the viscosity function of these blends is not sensitive to the mixing conditions. However, the elasticity is always, dependent on mixing. Elasticity is expressed as ΔPe/σ, where ΔPe is the entrance pressure drop from the Bagley plot and σ the shear stress. In general, ΔPe/σ of the blend decreases with increasing mixing.     

Overall properties of fibrillar silicate/styrene–butadiene rubber nanocomposites

The mechanical properties, heat aging resistance, dynamic properties, and abrasion resistance of fibrillar silicate (FS)/styrene butadiene rubber (SBR) nanocomposites are discussed in detail. Compared with white carbon black (WCB)/SBR composites, FS/SBR composites exhibit higher tensile stress at definite strain, higher tear strength, and lower elongation at break but poor abrasion resistance and tensile strength. Surprisingly, FS/SBR compounds have better flow properties. This is because by rubber melt blending modified FS can be separated into numerous nanosized fibrils under mechanical shear. Moreover, the composites show visible anisotropy due to the orientation of nanofibrils. There is potential for FS to be used to some extent as a reinforcing agent for rubber instead of short microfibers or white carbon black. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 2725–2731, 2006     

纳米白炭黑/炭黑并用对SBR硫化胶性能的影响

研究了纳米白炭黑／炭黑并用体系对ＳＢＲ硫化胶物理性能及磨耗形态的影响,并提出了补强模型。结果表明,纳米白炭黑／炭黑并用体系可提高补强效果,当其并用比为６／２４时,硫化胶的拉伸强度和撕裂强度最大,耐磨性最佳。硫化胶补强性能的提高,一方面需要粒子与大分子之间有较强的结合力,另一方面还需要粒子表面上的产生滑移。     

Mechanical and aging properties of cross‐linked ethylene propylene diene rubber / styrene butadiene rubber blends

The mechanical properties and aging characteristics of blends of ethylene propylene diene monomer (EPDM) rubber and styrene butadiene rubber (SBR) were investigated with special reference to the effect of blend ratio and cross‐linking systems. Among the blends, the one with 80/20 EPDM/SBR has been found to exhibit the highest tensile, tear, and abrasion properties at ambient temperature. The observed changes in the mechanical properties of the blends have been correlated with the phase morphology, as attested by scanning electron micrographs (SEMs). The effects of three different cure systems, namely, sulfur (S), dicumyl peroxide (DCP), and a mixed system consisting of sulfur and peroxide (mixed) on the blend properties also were studied. The stress‐strain behavior, tensile strength, elongation at break, and tear strength of the blends were found to be better for the mixed system. The influence of fillers such as high‐abrasion furnace (HAF) black, general‐purpose furnace (GPF) black, silica, and clay on the mechanical properties of 90/10 EPDM/SBR blend was examined. The ozone and water aging studies also were conducted on the sulfur cured blends, to supplement the results from the mechanical properties investigation. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2606–2621, 2004     

氯醚橡胶/丁腈橡胶橡胶共混物性能的研究

研究了共聚型氯醚橡胶／丁腈橡胶共混比、促进剂ＮＡ－２２用量、补强剂及软化剂对共混物性能的影响。结果表明：随着氯醚橡胶用量的增加，共混物的耐低温性、耐热氧老化性、耐油性及耐ＣＣｌ＿４和ＣＨＣｌ＿３性能提高，但拉伸强度降低；当促进剂ＮＡ－２２和半补强炭黑的用量分别为１．５和６０份时，氯醚橡胶／丁腈橡胶（６０／４０）共混物的拉伸强度及撕裂强度出现峰值；使用液体丁腈橡胶作软化剂．使共混物的耐低温性、回弹值、撕裂强度、扯断伸长率及耐油性提高，但耐热氧老化性及耐ＣＣｌ＿４和ＣＨＣｌ＿３性能降低。     

Wood flour as a secondary filler in carbon black filled of styrene butadiene/chlorosulphonated polyethylene rubber blend

A study is reported which aims to identify the optimum contents of wood flour (WF) to be introduced into styrene butadiene/chlorosulphonated polyethylene (SBR/CSM) rubber blend compounded with carbon black. A range of composite properties are considered including cure characteristics and mechanical properties, as well as the adhesion strength (rubber‐to‐metal bonding) behavior. Processing characteristic such as maximum torque increases with increasing of the concentration of WF up to 40 phr in SBR/CSM blend, whereas the scorch time and optimum cure time decreases. Results indicated that the tensile strength and tensile modulus, as well as shore hardness of the SBR/CSM composite in which SBR is predominant, increase in a compliance with the increase of WF. Adhesion strength value on peel between metal and WF filled SBR/CSM rubber blend increases when the filling level increases and the maximum value were observed at 40 phr of WF. The enhancement in mechanical properties was supported by data of crosslink density in these samples obtained from swelling measurement. Addition of WF was recommended as an economical and ecological benefit to industries as the properties of the rubber/carbon black composites remained unchanged with increasing WF content. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers.     

Effect of fillers on morphological properties in NR/SBR blends for OTR tyres

Abstract

The blends of styrene butadiene rubber (SBR) and natural rubber (NR) are prepared using a two-roll mixing mill in the presence of different types of carbon blacks as reinforcing filler. The effects of fillers on cure characteristics and thermal, dynamic–mechanical, morphological properties of the blends are studied. The ISAF N231 type of carbon black shows a significant effect on tensile, tear and modulus properties by reacting at the interface between SBR/NR matrixes. The dynamic characteristics and storage modulus of SBR/NR with SAF N110 and SRF N774 types of carbon black show distinct characteristics in respect to all other blends in this system. The thermal stability of the rubber vulcanizates containing SAF N110 and SRF N774 types of carbon blacks is higher than other blend types. With the increasing percentage of SBR to NR, the thermal stability of the blend is increased. However, the heat buildup of the blends increases with the increase in SBR percentage.     

Mechanical and morphological properties of cellular NR/SBR vulcanizates under thermal and weathering ageing

The effects of addition of two chemical blowing agents in cellular rubber blend of natural rubber (NR) and styrene‐butadiene rubber (SBR) at a fixed blend ratio of 1 : 1 on cure characteristics, and mechanical and morphological properties were invesigated. The chemical blowing agents used in this work were Oxybis (benzene sulfonyl) hydrazide (OBSH) and Azo dicarbonamide (ADC). Three different fillers, fly ash (FA) particles, precipitated silica, carbon black (CB) at their optimum concentrations of 40 phr were used, the FA and silica particles being chemically treated by bis‐(3‐triethoxysilylpropyl) tetrasulphide. The results suggested that the overall cure time decreased with OBSH and ADC contents. The OBSH was more effective in cure‐acceleration of the NR/SBR blend than the ADC. The NR/SBR vulcanized foams produced by OBSH and ADC agents had closed‐cell structures. The specific density and mechanical properties of the blend tended to decrease with increasing blowing agent content. The CB gave NR/SBR foams with smaller cell size, better cell dispersion, and higher mechanical properties than the precipitated silica and FA particles. The heat ageing and weathering resulted in an increase in tensile modulus and hardness, but lowered the tensile strength, ultimate elongation and tear strength. The elastic recovery for cellular NR/SBR vulcanizates with FA was superior to that with CB and silica, the elastic recovery of the blends decreasing with blowing agent content. Resilience property was improved by the presence of gas phases. The optimum concentration of OBSH and ADC to be used for NR/SBR vulcanizates was 4 phr. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Cure characteristics and mechanical properties of styrene-butadiene rubber/hydrogenated acrylonitrile-butadiene rubber/silica composites

Composites of styrene butadiene rubber (SBR), hydrogenated acrylonitrile–butadiene rubber (HNBR) and silica were prepared. Sulfur (S), dicumyl peroxide (DCP) and a combination of S and DCP (M) were used as curing agents, respectively. The morphology of the composites with different blend ratio was examined to correlate with observations on mechanical properties by scanning electron microscopy. The effects of blend ratio and curing systems on the curing characteristics and mechanical properties, such as stress–strain behavior, tensile strength, elongation at break and hardness of SBR/HNBR/Silica composites, were studied. Composites prepared by M curing systems showed comparatively better mechanical properties, wet traction and rolling resistance than S and D curing systems. The tensile strength, tear strength, and elongation at break were improved by adding HNBR for M curing systems. The wet traction of the vulcanizates containing HNBR was better than that of the vulcanizates without HNBR. A relatively uniform dispersion of silica was observed for SBR/HNBR/silica compositions compared with SBR/silica composites.     

丁苯橡胶/纳米硅铝管复合材料的制备工艺与性能

分别采用直接共混法、填料预处理法、原位改性分散法、乳液法制备了丁苯橡胶/纳米硅铝管（SBR/SANT）复合材料,并对其结构和性能进行了表征。结果表明：采用原位改性分散的方法能够有效改善填料与橡胶间的界面强度,制备得到力学性能优异的SBR/SANT复合材料。采用乳液法制得复合材料的填料分散较好,扫描电子显微镜观察到SANT基本以单管分散,其导热性能明显优于干法混合。随着纳米硅铝管用量增大,SBR/SANT复合材料的硬度、定伸应力、拉伸强度、撕裂强度和导热系数提高,拉断伸长率下降。