NR/共沉型聚丁二烯橡胶并用胶性能研究

研究NR／共沉型聚丁二烯橡胶并用胶的性能。试验结果表明，随共沉型聚丁二烯橡胶用量的增大，NR／共沉型聚丁二烯橡胶并用胶门尼粘度增大，焦烧时间和正硫化时间延长；与NR、NR／BR9000并用胶及NR／BR9073并用胶相比，NR／共沉型聚丁二烯橡胶并用胶的生热低、抗湿滑性优良，耐磨性稍差，其它性能相差不大。     

不同产地天然橡胶标准胶的微观结构和性能

研究泰国北部STR20 1~#、泰国南部STR20 2~#、马来西亚SMR20和缅甸MSR20四种天然橡胶标准胶的微观结构和性能。结果表明,SMR20和STR20 2~#除了含有顺式聚异戊二烯外,还含有少量聚异戊二烯3,4-结构单元,且SMR20蛋白质含量最高,耐热氧老化能力最强。在加工性能方面,SMR20加工性能最好,凝胶含量最低,STR20 1~#加工性能最差。在物理性能方面,SMR20和STR20 1~#硫化胶的定伸应力、拉伸强度和耐磨性能优于MSR20硫化胶,但抗撕裂性能比MSR20硫化胶差。SMR20硫化胶的抗湿滑性能最好,滚动阻力小,动态力学性能最优。     

碳纤维/石墨烯协同改性NR/BR并用胶性能研究

本文采用采用机械混炼法将碳纤维/石墨烯加入到NR/BR中,研究了碳纤维与石墨烯协同改性对NR/BR混炼胶门尼粘度、硫化特性、动态流变性能、动态力学性能及导电导热性的影响。研究结果表明：随着碳纤维/石墨烯含量的增多,胶料的最大转矩MH和最小转矩ML增大;在力学性能方面,随着石墨烯含量的增多,NR/BR硫化胶的定伸应力提高;另外通过DMA测试可以看出,石墨烯的加入有利于提高NR/BR的抗湿滑性;并且由于碳纤维/石墨烯的良好的导电性,可以明显提高NR/BR抗静电性。     

胶清橡胶与标准橡胶性能对比研究

胶清橡胶是用制造离心法浓缩胶乳时分离出来的胶清,经凝固、压片或造粒和干燥而制成。胶清含橡胶约3%～7%,其中以细小的橡胶粒子为主;非橡胶物质含量很高,其中许多是蛋白质,铜和锰的含量也很多。     

低滚动阻力台面胶的研究

采用正交试验方法,对胶料各组分进行优化,使胎面胶滚动阻力降低,同时又能保持良好的抗湿滑性能。试验结果表明,用溶聚丁苯橡胶替代乳聚丁苯橡胶和用白炭黑部分替代炭黑可以有效降低胎面胶的滚动阻力;填料总用量和芳烃油用量是影响滚动阻力和抗滑滑性能的最主要因素。     

抗湿滑性树脂用量对胎面橡胶性能的影响

研究了不同抗湿滑性树脂用量对白炭黑胶料特性的影响,探讨了不同树脂用量及种类对胶料物性及动态性能的影响。试验结果表明,在白炭黑橡胶中使用不同量抗湿滑性树脂,橡胶物理特性随之变化,随用量的增加表现出模量和硬度降低的趋势,同时研究发现加入不同用量树脂对橡胶动态力学性能也有很大影响,表现在抗湿滑特性提高明显,滚动阻力特性影响较小,同时比较两个不同厂家抗湿滑性树脂特性。     

星型杂臂橡胶SIBR结构与性能研究

采用溶液聚合法,以环己烷为溶剂、以THF和SDBS结构调节剂、以DVB为偶联剂,制备了星型杂臂橡胶SIBR,由于其兼具高的抗湿滑性能及低的滚动阻力,被广泛应用于高性能轮胎中。研究了星型杂臂橡胶SIBR相分离结构、臂数、w(3,4-PI)结构含量、苯乙烯含量等对物理机械性能及加工性能的影响。结果表明,通过调节共聚物组成和微观结构可获得不同的相形态。随臂数的增加,拉伸强度、扯断伸长率增大。随w(3,4-PI)结构含量增加,拉伸强度、扯断伸长率、300%定伸模量增大。随着苯乙烯含量增大,抗湿滑性增大,滚动阻力也相应有所增加。     

不同添加方式对改性丙烯酸胶性能的影响

制备一种改性丙烯酸胶,并提高其韧性、耐冲击性能,采用不同的添加方式,第一种添加方式：A组分中加ABS树脂和氯丁橡胶,B组分加ABS树脂;第二种添加方式：A组分中加ABS树脂和氯丁橡胶,B组分加ABS树脂和氯丁橡胶;第三种添加方式,在A组分中只加橡胶,B组分只加ABS树脂。考察了ABS树脂的添加量对改性丙烯酸胶性能的影响。结果表明,当采用第二种添加方式,且ABS树脂添加量为17%时,其黏度合适,且其拉伸剪切强度和耐冲击强度较高,热贮存稳定极佳。     

绿色环保型轮胎胎面胶配方研究

实验通过丁苯橡胶中并用适量天然橡胶以及加入白炭黑、炭黑对丁苯橡胶性能影响进行分析.通过测试硫化胶的硬度、拉伸强度、撕裂强度、扯断伸长率、磨耗和抗湿滑指数,找到各种生胶合理的并用份数.结果表明:SBR单独使用时,具有较高的拉伸强度.SBR/NR并用时,正硫化时间变短,撕裂强度、硬度、回弹,抗湿滑性随NR含量的增大而降低.白炭黑较炭黑填充拉伸强度、撕裂强度低,硬度增大,磨耗下降.SBR/NR随NR含量的增加,屈挠性能变好.     

溶聚丁苯橡胶2557A与5025-2结构和性能的对比研究

采用傅里叶变换红外光谱分析仪、凝胶渗透色谱-激光光散射-自动黏度在线检测仪、动态力学性能分析等手段,对国产溶聚丁苯橡胶(SSBR 2557A)的微观结构及基本性能进行了分析与表征,并与国外丁苯橡胶(SSBR 5025-2)产品作了对比,同时对其在轿车子午线轮胎中的应用性能进行了分析。结果表明,SSBR 2557A顺式含量和反式1,4结构含量几乎相同,而SSBR 5025-2的顺式1,4含量明显大于反式1,4结构含量,两种胶都为高乙烯基含量结构。与SSBR 5025-2相比,SSBR 2557A支化度较低。SSBR 2557A在0℃时的tanδ高达0.779,表明其降低滚动阻力的同时,显著提高了轮胎的抗湿滑性。     

耐候型ASA树脂的制备及其性能研究

采用悬浮聚合法,以丙烯酸丁酯、苯乙烯和丙烯腈为原料,合成了一系列丙烯酸丁酯-苯乙烯-丙烯腈(ASA)树脂。考察了橡胶相聚丙烯酸丁酯(PBA)、交联剂二甲基丙烯酸乙二醇酯(EGDMA)、接枝剂甲基丙烯酸烯丙酯(ALMA)和摩尔质量调节剂十二烷基硫醇(TDDM)的用量对ASA树脂的冲击强度的影响;PBA质量分数对ASA树脂的拉伸强度和断裂伸长率的影响。结果表明:PBA质量分数达到20%后,ASA树脂的冲击强度大幅增加;EGDMA、ALMA和TDDM的质量分数分别为0.43%、0.4%和1%时,ASA树脂的冲击强度达到最大值;随PBA增加,ASA树脂的拉伸强度减小,断裂伸长率变大。     

Study on the Properties of Blend Rubber Between Grafted Rubber Latex and Natural Rubber Latex by Gamma Radiation

Blend rubber films were prepared by mixing styrene grafted rubber latex and natural rubber latex (NRL) with varying proportions by gamma radiation from Co-60 source at room temperature. Tensile strength, modulus at 500% elongation, elongation at break, permanent set, and swelling ratio were measured. Tensile strength and modulus at 500% elongation attain maximum at 8 kGy radiation dose for blend rubber films. The increase in tensile strength is insignificant, but modulus increases from 5.61 to 7.46 MPa with increased proportion of grafted rubber latex from 40 to 70% in the blend at this radiation dose. Elongation at break, permanent set, and swelling ratio of blend rubber decreases with increase in radiation dose as well as proportion of grafted rubber.     

丁腈橡胶/石墨纳米复合材料的制备、结构及性能研究

采用乳液共混、直接共混及溶液共混等方法制备了丁腈橡胶/石墨复合材料,并用电子显微镜和X-射线进行了观察和衍射测试。结果表明,采用乳液共混可以制备出同时具有插层和剥离结构的纳米复合材料。随着石墨用量的增加,所得复合材料的力学性能(特别是小应变下的应力)逐渐提高,同时动态力学性能也有了显著的改善。另外,该复合材料还表现出多种优异的功能特性,如高气密性、高导电性和高导热性、低的摩擦系数和较好的耐磨损性能。     

改性煤矸石粉/SBS复合材料的制备及性能研究

采用双辊开炼机和平板硫化机高压制样的方法制备了煤矸石粉/SBS复合材料体系,运用SEM、DSC、TG对复合材料的断面形貌和热性能进行了分析,同时对复合材料的力学性能进行考察。结果表明,表面改性的煤矸石粉在SBS体系中与弹性体充分结合,断面产生了大量的网状结构,进一步提高了材料的拉伸强度、断裂伸长率和热稳定性,硬度增加幅度较小。     

Study on preparation of chlorinated natural rubber from latex and its thermal stability

The effects of pH value of reaction system, reaction time, and reaction temperature on the chlorination reaction in the preparation of chlorinated natural rubber (CNR) from natural rubber latex were discussed. It has been found from the thermal analysis that the thermal degradation of CNR in nitrogen is a one-step reaction, and 30% carbonide with a stable structure remained at 360 to 700°C; whereas the thermo-oxidative degradation of CNR in air is a multistep reaction, and the thermal degradation ratio reaches to 100% at 560°C. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2863–2867, 1999     

造纸黑液-蒙脱土/顺丁橡胶复合材料的制备及其结构和性能研究

采用共沉淀-脱水法制备了黑液-蒙脱土(BL-MMT)新型复合填料,并将其与顺丁橡胶(BR)机械共混制备了BL-MMT/BR复合材料。对复合材料进行了XRD、SEM、DSC和TGA分析,并研究了复合材料的热氧老化性能和力学性能。XRD和SEM结果表明BL-MMT在复合材料中分散明显优于纯MMT,与橡胶的相容性更好;DSC结果显示BL-MMT复合填料的加入形成了结合胶并促进了BR结晶,由于MMT的良好分散以及结合胶和结晶的形成,BR的力学性能、热氧老化性能和热稳定性得到了显著提高。BL-MMT制备工艺环保,是一种具有应用前景的橡胶补强剂。     

聚氨酯／顺丁橡胶共混物结构与性能的研究

采用物理共混的方法,制备了廉价的ＢＲ和贵的热塑性聚氨酯（ＴＰＵ）共混物。利用电子拉力机,液变仪,动态粘弹仪,偏光显微镜和电子显微镜对力学性能、流变性能,动态粘弹性和形态结构进行了研究和分析。结果表明,ＢＲ和ＴＰＵ有较好的相容性,ＴＰＵ／ＢＲ共混物能达到使用要求,一些性能好于纯ＴＰＵ《     

Effect of ammonium derivatives of oligoamidephosphates on the vulcanization characteristics and mechanical properties of some rubber compounds. 1. Isoprene rubber compounds

IR compounds containing ammonium derivatives of oligoamidephosphates were studied with respect to vulcanization and mechanical characteristics. The ammonium derivatives were obtained as neutral analogues of the corresponding oligoamidephophates. The results indicate an improved efficiency of the neutral products and the possibility of a partial replacement of traditional sulphenamide accelerators with the studied ammonium derivatives, leading to a strong improvement of the fatigue resistance (by more than one order). The addition of such products without reducing the level of the basic accelerator led to additional acceleration—the cure rate increased and the cure time decreased up to three times. Ageing resistance showed a tendency to improve.     

Study on mechanical properties and fire resistance of porous ceramic silicone rubber

Porous ceramic silicone rubber (PCSR) has an excellent ablative resistance because of its strong carbon layer structure after burning. However, as a marine sealant material, it also needs to have better mechanical properties for better application. In this study, PCSR composites were prepared by compounding with different additives and different viscosity base adhesives, and their fire resistance, tensile properties, and bond strength of multiple substrates at different temperatures were investigated and compared. When the ratio of 20,000 to 80,000 viscosity matrix adhesive is 3:7, the material prepared by adding deketoxime crosslinker and silane coupling agent containing amino and epoxy groups together can reach more than 1.4 MPa tensile shear strength at 150°C. Sintering experiments have shown that PCSR composites can still maintain the strength and integrity of the carbon layer structure, and the results of the A-60 standard fire resistance test for cable and pipe penetration devices have shown that marine PCSR sealants can effectively prevent flame propagation.