共查询到19条相似文献,搜索用时 312 毫秒
1.
采用低温高剪切原位改性工艺制备超细全硫化粉末丁苯橡胶(UFPSBR)改性沥青,研究UFPSBR改性沥青的基本性能和热储存稳定性.结果表明:随着UFPSBR用量的增大,UFPSBR改性沥青的25℃针入度减小,软化点升高;加入相容剂后,UFPSBR改性沥青的当量软化点(T800)提高,当量脆点(T1.2)降低;不加相容剂的UFPSBR改性沥青中UFPSBR发生团聚现象,加入相容剂后,UFPSBR和沥青的相容性增强,形成了相对稳定的相界面;相容剂能显著提高UFPSBR改性沥青的热储存稳定性. 相似文献
2.
3.
4.
采用双螺杆挤出机辅以活化剂制备活化废轿车轮胎胶粉(GTR),用其改性沥青或与苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)复合改性沥青。研究了活化GTR的溶胶、凝胶含量,考察了活化GTR改性沥青和活化GTR/SBS复合改性沥青的基本性能及微观形貌。结果表明,热剪切以及添加活化剂均能提高GTR的溶胶含量,使脱硫降解程度增大;用活化GTR改性沥青,改性沥青的针入度大幅增大,软化点、弹性回复、黏度明显降低;用活化GTR/SBS复合改性沥青,随着活化GTR含量的增大,改性沥青的软化点升高,针入度、延度、弹性回复降低,但经旋转薄膜老化后延度提高,耐老化性能提高;活化GTR在沥青中的粒径明显减小,分散性得到改善,而活化GTR/SBS复合改性沥青时,GTR均匀分散于SBS的网络结构中。 相似文献
5.
研究超细全硫化粉末丁苯橡胶(UFPSBR)对天然橡胶(NR)/丁苯橡胶/顺丁橡胶(BR)胎面胶性能的影响。结果表明:与未加UFPSBR的胎面胶相比,加入2~3份UFPSBR的NR/溶聚丁苯橡胶/BR胎面胶拉伸强度略有减小,耐磨性能和抗湿滑性能提高,生热降低;加入1~2份UFPSBR的NR/乳聚丁苯橡胶/BR胎面胶拉伸强度增大,抗湿滑性能略有提高,滚动阻力变化不大,耐磨性能下降。 相似文献
6.
7.
8.
为了制备储存稳定性良好的橡胶改性沥青,基于高温混炼工艺,使用聚苯乙烯-聚丁二烯-聚苯乙烯嵌段聚合物(SBS)、芳烃油、辛烯聚合物橡胶反应剂(TOR)、稳定剂与橡胶粉对基质沥青进行复合改性。提出了橡胶改性沥青的制备方法,分析了改性剂对沥青常规性能和流变特性的影响,并通过荧光试验观察改性剂在沥青中的分散效果。研究结果表明:添加质量分数为25%的40目(380 μm)胶粉可以明显提高沥青的高温性能;180 ℃下剪切60~90 min后溶胀发育60 min可以得到稳定性良好的橡胶改性沥青;加入相容剂和稳定剂可以提高胶粉的溶胀与分散程度,改性剂之间对沥青性能的影响存在协同作用;复合改性沥青具有良好的弹性恢复能力和高温抗变形性能;橡胶粉、SBS在沥青中的溶胀程度和分散均匀性是影响沥青常规性能和储存稳定性的直接因素。 相似文献
9.
10.
吕令钊 《合成材料老化与应用》2020,49(4):104-107
为延缓沥青路面反射裂缝发展,选用沥青稳定碎石作为下面层,研究了玄武岩纤维和SBS改性沥青对沥青稳定碎石路用性能影响规律。结果表明,掺入玄武岩纤维和采用SBS改性沥青均改善了沥青稳定碎石路用性能,且玄武岩纤维改性沥青稳定碎石路用性能最佳;玄武岩纤维对沥青稳定碎石路用性能的改善作用较采用改性沥青对稳定碎石的作用要小;掺入玄武岩纤维和采用SBS改性沥青有效地抑制了沥青稳定碎石裂缝的发展,同一试验条件下玄武岩纤维改性沥青稳定碎石疲劳寿命最高、低温抗裂性能最优,弯拉强度和弯拉应变较基质沥青稳定碎石分别提高了1.6倍和1.9倍。 相似文献
11.
12.
In this paper, the use of ultrafine full-vulcanized powdered styrene-butadiene rubber (UFPSBR) in natural rubber/styrene-butadiene rubber was studied. Scanning electron microscopy (SEM) and thermogravimetric analysis (TGA) were employed to characterize UFPSBR. Other testing methods were used to determine the performance of the vulcanizates containing UFPSBR. To analyze the cross-link density of vulcanizates, equilibrium swelling method was used. Dynamic mechanical analysis (DMA) was used to analyze storage modulus (E′) and loss tangent (tanδ). SEM results showed that the average diameter of UFPSBR particles was 10?μm approximately. TGA indicated that the amount of inorganic particles in UFPSBR was about 32?% by weight. The testing results of mechanical properties showed that the compounds containing 5?phr UFPSBR had good comprehensive performance. DMA results showed that, according to the values of tanδ, after UFPSBR was added the wet traction performance of the blends was improved. 相似文献
13.
14.
The performance and modification mechanism of Buton rock asphalt (BRA) modified asphalt were analyzed. The road performance of modified asphalt was observed and compared with SBS modified asphalt to confirm the modification mechanism. Four-component test, and dynamic shear rheological tests were conducted to identify the performance of modified asphalt. Fourier transform infrared spectroscopy was carried out to analyze the modification mechanism of modified asphalt. Finally, the rutting, low-temperature bending beam failure, and freeze–thaw splitting tests were used to evaluate the high-temperature performance, low-temperature cracking resistance, and water stability performance of mixtures, respectively. The results show that the high-temperature performance of asphalt can be improved by BRA with asphaltene and resin increased. It is likely that there is no new functional group generated and this process was physical changes mainly. The honeycomb structure of BRA ashes/particles increased the contact area between the base asphalt and BRA ashes/particles, which makes the asphalt change from the homogeneous body into a two-phase continuous structure system. Consequently, the adhesion between asphalt and BRA ashes/particles was enhanced, and the dynamic stability, bending coefficient and splitting strength ratio were improved. It indicates that the test results of asphalt mixtures verified the modification effect of BRA. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 46903. 相似文献
15.
采用纳米CaCO3和苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)作为外加剂制备纳米CaCO3/SBS复合改性沥青。通过测试基本物理性能确定了外加剂的最佳掺量,通过流变性能测试、离析试验、荧光显微镜观察及热重分析等考察了沥青的性能及微观形貌。结果表明,两种外加剂复配的最佳比例为5%(质量分数,下同)的纳米CaCO3和4%的SBS;在纳米CaCO3改性沥青中掺加SBS后,复合改性沥青在不同温度下的黏度增大,高温抗车辙能力增强,低温性能得到明显改善,储存稳定性良好;纳米CaCO3分子、SBS分子和基质沥青分子三者具有良好的相容性,经复合改性后沥青的热稳定性增强。 相似文献
16.
为了研究废旧轮胎橡胶灰分用于改性沥青的性能,通过高温热分解方法制备橡胶灰分,并以0%~5.0%掺量对2种基质沥青进行改性.采用沥青三大指标、动态剪切流变试验、针入度指数、布氏粘度、弹性恢复、薄膜烘箱试验和离析试验,评价了橡胶灰分对沥青高、低温性能、温度敏感性、粘温性能、弹性恢复、老化性能和储存稳定性的影响.同时借助扫描电镜观察橡胶灰分的微观形貌,利用荧光显微镜分析改性沥青的均匀程度.结果表明:废旧轮胎橡胶灰分可显著提高沥青的高温性能,降低其温度敏感性,改善其粘温性能;当其掺量低于3.0%时,沥青的弹性恢复得到显著改善,而沥青的低温性能、老化性能和储存稳定性无明显影响;微观试验显示橡胶灰分为不规则的蜂窝状多孔结构,可吸附沥青并在其中均匀分布. 相似文献
17.
18.
19.
采用聚烯烃弹性体(POE)对苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青进行复配改性,制备了POE/SBS改性沥青混合料。考察了POE用量对SBS改性沥青抗老化性能的影响。结果表明,POE/SBS复配改性能提升沥青混合料的高温抗老化性能,且对低温性能有一定的改善效果。POE改善了SBS改性沥青混合料的抗车辙和抗老化性能,但会在一定程度上降低其低温韧性。当在沥青中加入质量分数分别为4%和3%的SBS和POE,POE/SBS改性沥青混合料的综合性能较佳。 相似文献