防护体系对NR／BR／SBR并用胶性能的影响

探讨防老剂4010NA／RD／防护蜡、防老剂4020／RD／防护蜡、防老剂4010／4020／RD／防护蜡和防老剂AW／4010NA／4020／RD／防护蜡体系对NR／BR／SBR并用胶性能的影响。结果表明,4种防护体系对NR／BR／SBR并用胶耐臭氧老化性能影响差别较大,防老剂AW／4010NA／4020／RD／防护蜡体系并用胶耐臭氧老化性能远优于其它3种防护体系并用胶;4种防护体系并用胶的硫化速度和物理性能影响差异不大。     

防护体系对NR/BR/SBR 并用胶性能的影响

探讨防老剂4010NA/RD/防护蜡、防老剂4020/RD/防护蜡、防老剂4010/4020/RD/防护蜡和防老AW/4010NA/4020/RD/防护蜡体系对NR/BR/SBR并用胶性能的影响。结果表明,4种防护体系对NR/BR/SBR并用胶耐臭氧老化性能影响差别较大,防老剂AW/4010NA/4020/RD/防护蜡体系并用胶耐臭氧老化性能远优于其它3种防护体系并用胶;4种防护体系并用胶的硫化速度和物理性能影响差异不大。     

热重分析法测定橡胶并用比

研究热重（TG）分析法测定橡胶并用比。通过对天然橡胶（NR）、顺丁橡胶（BR）和不同种类丁苯橡胶（SBR）进行TG分析,得到不同样品用量NR、不同种类SBR以及BR和SBR与NR不同并用比并用胶的TG分析曲线,提出面积法计算NR/SBR和NR/BR并用胶并用比的方法。结果表明该方法得到的并用胶并用比在两种橡胶用量接近时具有很高的准确性,随着两种橡胶用量差的增大准确性有所下降。     

硫化胶中橡胶种类的定性和定量分析

采用裂解-气相色谱/质谱（Py-GC/MS）法研究子午线轮胎常用的4种橡胶天然橡胶（NR）、丁苯橡胶（SBR）、顺丁橡胶（BR）和溴化丁基橡胶（BIIR）及其并用胶NR/SBR,SBR/BR,NR/BR和NR/BIIR,确定4种橡胶的特征裂解产物,建立Py-GC/MS法定性定量分析未知硫化胶中并用橡胶的方法。结果表明,本方法在未知硫化胶分析时定性分析非常准确,可做半定量分析,重复性良好,相对标准偏差为0.01%。     

天然橡胶/丁苯橡胶/反式丁戊橡胶并用胶的性能研究

研究反式丁戊橡胶（TBIR）对天然橡胶（NR）/丁苯橡胶（SBR）并用胶性能的影响。结果表明：用15份TBIR替代NR,NR/SBR/TBIR并用胶的NR与SBR相容性改善,拉伸强度和定伸应力略有降低,耐磨性能、耐压缩疲劳性能和耐屈挠疲劳性能提高;用15份TBIR替代SBR,NR/SBR/TBIR并用胶的NR与SBR相容性明显改善,拉伸性能变化不大,耐磨性能、耐压缩疲劳性能和耐屈挠疲劳性能提高;用15份TBIR替代NR/SBR并用胶,NR/SBR/TBIR并用胶的大部分性能介于TBIR单独替代NR与SBR并用胶的性能之间,抗湿滑性能提高,滚动阻力降低;在NR/SBR并用胶中直接加入6份TBIR,NR/SBR/TBIR并用胶的NR与SBR相容性改善,耐磨性能、耐压缩疲劳性能和耐屈挠疲劳性能提高,抗湿滑性能和滚动阻力降低。     

CR与其它橡胶并用的研究概况

介绍了CR与NR，IR，BR，CIIR，SBR，NBR和EPDM等橡胶并用的研究概况。CR与CIIR，SBR和NBR的相容性较好；CR与NR，IR，BR和EPDM的相容性较差，CR／NR，CR／IR，CR／BR和CR／EPDM并用体系可采用嵌段共聚物、接枝共聚物等作相容剂。CR并用胶可用于轮胎胎侧和内衬层、硫化胶囊、胶管内层胶和外层胶、胶带、导电橡胶制品、耐火橡胶制品等的制备。     

防老剂DH在轮胎胶料中的应用

研究防老剂DH对NR ,SBR ,BR和NR/SBR并用胶的热空气老化和天候老化的防护作用 ,并与防老剂40 2 0 ,BLE和RD进行对比试验。结果表明 ,在NR ,SBR和BR胶料中 ,对于耐热空气老化性能 ,防老剂DH的防护效果优于防老剂RD和BLE ,劣于防老剂 40 2 0。对于耐天候老化性能 ,防老剂 40 2 0的防护效果最佳 ;在NR和BR胶料中 ,防老剂DH优于防老剂BLE和RD ;在SBR胶料中 ,防老剂DH ,BLE和RD的防护效果相近。防老剂DH对胶料基本无污染。在实际应用配方胶料中 ,用 1 0～ 1 5份防老剂DH替代 2份防老剂BLE或RD可以改善胶料的耐热空气老化和耐天候老化性能 ;如果用 1份防老剂DH替代 2份防老剂RD或BLE ,则分别可降低胶料成本约 17 5或10 7 5元·t- 1 ,具有一定的经济效益     

丁苯橡胶三维溶度参数的测定及应用

采用平衡溶胀法和计算机HSPi P软件模拟测定了丁苯橡胶（SBR）的三维溶度参数,并研究了三维溶度参数在建立Hansen二维溶度参数图及确定相对能量差（RED）与溶胀比（q）的关系中的应用。结果表明,SBR的三维溶度参数δd、δp、δh分别为17.70,3.20,3.10 MPa1/2;根据Hansen二维溶度参数图可以快速准确地选取SBR的良溶剂或混合溶剂;SBR的q值随着RED的增大而减小,并在RED为1时出现拐点,此时溶剂由良溶剂转变为不良溶剂。     

新型橡胶代用材料PVCR的应用试验

考察了易与橡胶共混的改性聚氯乙烯树脂（PVCR）在通用橡胶（NR,BR和SBR）和胶带、胶带胶料中的应用情况。结果表明,PVCR可在常温下以常规混炼工艺与通用橡胶较好地混合：在纯胶配方中以PVCR等量替代10份NR、20份BR或15份SBR对胶料性能影响不大;在普通胶管、胶带胶料中也可以以10－20份的用量对其中的通用橡胶进行等量替代。     

微晶石蜡在橡胶密封件中的应用试验

采用国产微品石蜡,在NR、BR、SBR、CR、NBR胶料中加入制成各种密封件进行应用试验,结果表明其防老效果明显,与化学防老剂并用,可以大大提高橡胶密封件的耐动态疲劳性能和耐臭氧性能。     

Compatibility studies on some polymer blend systems by electrical and mechanical techniques

Systematic electrical and mechanical studies were carried out on natural rubber (NR) blended with different types of synthetic rubber such as styrene‐butadiene rubber (SBR), polybutadiene rubber (BR), and ethylene‐propylene‐diene monomer (EPDM) as nonpolar rubbers and nitrile‐butadiene rubber (NBR) and chloroprene rubber (CR) as polar rubbers. The NR/SBR, NR/BR, NR/EPDM, NR/NBR, and NR/CR blends were prepared with different ratios (100/0, 75/25, 50/50, 25/75, and 0/100). The permittivity (ε′) and dielectric loss (ε″) of these blends were measured over a wide range of frequencies (100 Hz–100 kHz) and at room temperature (∼ 27°C). The compatibility results obtained from the dielectric measurements were comparable with those obtained from the calculation of the heat of mixing. These results were confirmed by scanning electron microscopy and showed that NR/SBR and NR/BR blends were compatible while NR/EPDM, NR/NBR, and NR/CR blends were incompatible. To overcome the problem of phase separation (incompatibility) between NR and EPDM, NBR, or CR, a third component such as SBR or poly(vinyl chloride) (PVC) was added as a compatibilizing agent to these blends. The experimental data of dielectric and mechanical measurements showed that the addition of either SBR or PVC could improve the compatibility of such blends to some extent. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 60–71, 2001     

Silica‐modified SBR/BR blends

The purpose of this article is that the silica‐modified SBR/BR blend replaces natural rubber (NR) in some application fields. The styrene‐butadiene rubber (SBR) and cis‐butadiene rubber (BR) blend was modified, in which silica filler was treated with the r‐Aminopropyltriethoxysilane (KH‐550) as a coupling agent, to improve mechanical and thermal properties, and compatibilities. The optimum formula and cure condition were determined by testing the properties of SBR/BR blend. The properties of NR and the silica‐modified SBR/BR blend were compared. The results show that the optimum formulawas 80/20 SBR/BR, 2.5 phr dicumyl peroxide (DCP), 45 phr silica and 2.5 mL KH‐550. The best cure condition was at 150°C for 25 min under 10 MPa. The mechanical and thermal properties of SBR/BR blend were obviously modified, in which the silica filler treated with KH‐550. The compatibility of SBR/BR blend with DCP was better than those with benzoyl peroxide (BPO) and DCP/BPO. The crosslinking bonds between modified silica and rubbers were proved by Fourier transform infrared analysis, and the compatibility of SBR and BR was proved by polarized light microscopy (PLM) analysis. The silica‐modified SBR/BR blend can substitute for NR in the specific application fields. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

复合型防老剂8PPD在橡胶中的应用

用热空气老化和热分析的方法，考察了复合型防老型８ＰＰＤ对天然橡胶、顺丁橡胶和丁苯橡胶的热氧化防护性能，并与防老剂Ｄ，ＲＤ，４０１０ＮＡ和４０２０进行了对比，实验结果表明，防老剂８ＰＰＤ对ＮＲ，ＢＲ和ＳＢＲ的热氧化防护能力优于防老剂Ｄ和ＲＤ，接近防老剂４０１０ＡＮ和４０２０。防老剂８ＰＰＤ对３种橡胶的硫化特性有一定的影响。     

Quantitative characterization of interfaces in rubber–rubber blends by means of modulated‐temperature DSC

Rubber–rubber blends are used widely in industry, for example, in tire manufacture. It is often difficult to characterize interfaces in such rubber–rubber blends quantitatively because of the similarity in the chemical structure of the component rubbers. Here, a new method was suggested for the measurement of the weight fraction of the interface in rubber–rubber blends using modulated‐temperature differential scanning calorimetry (M‐TDSC). Quantitative analysis using the differential of the heat capacity, dCp/dT, versus the temperature signal from M‐TDSC allows the weight fraction of the interface to be calculated. As examples, polybutadiene rubber (BR)–natural rubber (NR), BR–styrene‐co‐butadiene rubber (SBR), SBR–NR, and nitrile rubber (NBR)–NR blend systems were analyzed. The interfacial content in these blends was obtained. SBR is partially miscible with BR. The cis‐structure content in BR has an obvious effect on the extent of mixing in the SBR–BR blends. With increasing styrene content in the SBR in the SBR–BR blends, the interface content decreases. NR is partially miscible with both BR and SBR. The NBR used in this research is essentially immiscible with NR. The maximum amount of interface was found to be at the 50:50 blend composition in BR–NR, SBR–BR, and SBR–NR systems. Quantitative analysis of interfaces in these blend systems is reported for the first time. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1791–1798, 2000     

NR／BR／SBR共混胶非轮胎制品胶料的性能

以天然橡胶、顺丁橡胶、丁苯橡胶共混物为基料，制造了普通三角带，夹布胶管，织物芯输送带以及聚酯三角带。实验结果表明，上述各制品胶料与ＮＲ／ＢＲ共混胶制品胶料相比，前者在焦烧性能、工艺性能以及化学纤维粘强度等方面均优于后者。     

Influence of rubber composition on change of crosslink density of rubber vulcanizates with EV cure system by thermal aging

Variation of the crosslink density of a rubber vulcanizate depending on the rubber composition after the thermal aging was studied with single rubber, biblend, and triblend vulcanizates of natural rubber (NR), butadiene rubber (BR), and styrene‐butadiene rubber (SBR). The efficient vulcanization (EV) system was employed to minimize the influence of free sulfur in the vulcanizate on the change of the crosslink density. Thermal aging was performed at 40, 60, and 80°C for 20 days with 5‐day intervals. The crosslink densities of the vulcanizates after the thermal aging increase. For the single rubber vulcanizates, variation of the crosslink density by the thermal aging has the order: SBR > BR > NR. For the biblend vulcanizates, variations of the crosslink densities of the NR/SBR and SBR/BR blends are larger than that of NR/BR blend. Variation of the crosslink density of the vulcanizate increases by increasing the SBR content in the vulcanizate. Variation of the crosslink density of the rubber vulcanizate depending on the rubber composition was explained by miscibility of the blends, combination reaction of the pendent groups, and mobility of the pendent group. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1378–1384, 2000     

Effect of silanized silica nanofiller on tack and green strength of selected filled rubbers

BACKGROUND: Tack and green strength of filled and gum (unfilled) natural rubber (NR), poly(styrene‐co‐butadiene) rubber (SBR), polybutadiene rubber (BR) and (SBR‐BR) blend with different loadings of reinforcement agent, silanized silica nanofiller (Coupsil 8113), were studied and the results compared and discussed. RESULTS: It was found that silica was fully dispersed in rubber matrix after 13 min of mixing. In addition, with some exceptions for NR and (SBR‐BR) blend, filler loading decreased the tack strength of the studied filled rubbers. Green strength and Mooney viscosity increased with filler loading for all studied filled rubbers but with different rates and amounts. The optimum filler loadings for NR and (SBR‐BR) filled blend were 30 and 10 phr, respectively. Tacks of NR filled rubbers were much higher than those of synthetic filled rubbers. CONCLUSION: It was concluded that filler loading alters substantially the tack and green strength of the rubbers under investigation. Copyright © 2009 Society of Chemical Industry     

汽车用橡胶减震材料新型环保配方研究

笔者研究了氯丁橡胶、三元乙丙橡胶共混胶：防老剂4020、防老剂RD、防老剂NBC,硫化促进剂TATD在橡胶减震材料中的应用,从经济环保的角度进行了新的配方设计,并进行了性能（邵尔A型硬度、拉伸强度、扯断伸长率、老化系数和耐久性）测试。通过对实验结果分析,确定氯丁橡胶、三元乙丙橡胶共混胶的在橡胶减震材料配方的壤佳比例及防老刑4020、防老荆RD、防老剂NBC的优化配伍比例。通过对比实验．结果表明：问等条件下,生产相同的橡胶减震材料产晶,使用硫化促进剂TATD的制品综合性能要优于使用硫化促进剂TMTD的制品．且用量少。     

轮胎胎面用新型橡胶的硫化特性研究

采用LH-Ⅱ硫化仪,研究了具有不同微观结构的轮胎胎面用国产乳聚SBR、BR、日本生产的八种牌号的溶聚SBR和乙烯基PBd及其与NR并用胶的硫化特性。结果表明,乙烯基含量越高,胶料的t_(90)越长,硫化返原性越好,而苯乙烯含量和顺、反式结构的影响较小。对于具有良好抗返原性的BR 1245和溶聚SBR SL 557,当它们与NR并用后,其并用胶抗返原性的改善程度较预计的大。返原性参数R值越小,胶料的抗返原性越好,R=(M_(max)-M_t)/M_(max)。BR1245的300％定伸应力随着硫化温度的提高和硫化时间的延长而明显增加。     

再生丁基橡胶与非极性不饱和橡胶共混物的性能研究

对再生丁基橡胶(RIIR)与非极性不饱和橡胶共混物的性能进行了研究。结果表明,RIIR易以填料的形式加入到非极性不饱和橡胶中使用,当RIIR以填料的形式加入到NR、BR及SBR中时,不仅使它们的耐热氧老化性及耐屈挠龟裂性得到明显改善,而且使NR及BR的撕裂强度及扯断伸长率提高;RIIR作为生胶与BR及NR共混,可改善BR的耐热氧老化性,提高NR的撕裂强度;SBR与RIIR共混,均使拉伸强度及撕裂强度降低;非极性不饱和二烯类橡胶与RIIR共混后,均使耐磨性降低。