影响SBS改性沥青质量的主要因素分析

分析了不同类型改性沥青的优缺点,确定了SBS改性沥青以其良好的高低温性能得到了广泛的使用和发展。文中从SBS化学结构、SBS微粒的大小、SBS添加量、稳定剂添加量及相容剂添加量等方面进行了分析,探讨了生产中各因素对改性沥青产品质量的影响,指出了生产中的常用配比。     

SBS改性沥青软化点的影响因素研究

软化点是评价SBS改性沥青高温性能的重要指标,本文主要介绍了基质沥青、改性剂型号及添加量、稳定剂添加量、工艺条件对SBS改性沥青软化点的影响。     

SBS改性脱油沥青宏观性能与微观形态的关系研究

以脱油沥青(DOA)制备针入度30号和50号的调和硬质沥青,并掺量2%到6%的星型SBS在170℃下经剪切、搅拌工艺制备SBS改性硬质沥青,对产物进行常规指标分析及荧光显微检测。常规指标分析表明SBS可以提高沥青的高温稳定性、低温抗裂性能和感温性能;存储稳定性分析表明稳定剂的加入可以明显的改善沥青的稳定性和抗老化性能;荧光显微镜图像表明改性沥青宏观性能与微观结构之间存在相关性,改性沥青要达到较好的宏观性能需要其微观结构中改性剂和沥青呈现均匀连续分散的状态。利用SBS和稳定剂制备优质改性硬质沥青合适配方为:SBS添加量为3.0%,稳定剂添加量为0.2%。     

低标号SBS改性乳化沥青的研究及应用

采用硬质沥青、70#基质沥青、SBS改性剂、稳定剂、温拌剂、乳化剂等制备成的低标号SBS改性乳化沥青,对其性能进行初步检验,探索一种能分步施工、不粘轮的防水粘结层用高性能改性乳化沥青。结果表明,先将硬质沥青、70#基质沥青按一定比例混合,添加SBS改性剂、温拌剂、稳定剂制作成SBS改性沥青,再添加乳化剂制得低标号SBS改性乳化沥青,能够满足防水粘结层分步施工、不粘轮的技术要求。     

苯乙烯-丁二烯-苯乙烯嵌段共聚物改性沥青的老化性能

考察了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)和加入含硫稳定剂的SBS改性沥青老化后的动态力学性能、黏度变化和低温物理性能。结果表明,SBS与含硫稳定剂的加入改善了老化后沥青的高温性能;老化后的改性沥青表现出更好的高温刚性,蠕变劲度降低,蠕变速率增大,老化后沥青的低温性能提高,且长期使用性能良好。     

一种超高耐磨热塑性橡胶鞋底材料

涉及一种鞋底材料，尤其是一种添加高分子耐磨改性剂超高相对分子质量聚乙烯的热塑性橡胶鞋底材料，其组分为：SBS、PS、填料、软化油、超高相对分子质量聚乙烯、UHMWPE、脱模剂、抗氧剂、热稳定剂、光稳定剂、发泡剂。在SBS、PS、软化油、填料和色粉基础上，     

贮存稳定的SBS改性沥青动态力学性能

研究了贮存稳定的SBS改性沥青的动态力学性能,比较了不同SBS用量,稳定剂用量及SBS的聚苯乙烯嵌段质量分数对改性沥青的耐高温性能的影响。结果表明：稳定剂的加入增加了改性沥青在高温下的弹性,其温度敏感性明显减弱;SBS用量与稳定剂用量对改性沥青材料的动态力学性能影响显著,随SBS和稳定剂用量的增加,改性沥青的复合模量增大,损耗角正切随温度升高而趋于不变;在实验范围内,SBS的聚苯乙烯嵌段质量分数对加入稳定剂的改性沥青的动态力学性能影响不大。     

高弹性SBS改性沥青的研究及应用

采用IRPC 70#A级基质沥青、CPC 90#A级基质沥青、SBS改性剂、稳定剂、抽出油等制备成高强度、高粘度、高弹性SBS改性沥青,对其指标及混合料性能进行检验。探索用高弹性SBS改性沥青铺筑2~2.5 cm应力吸收层,解决水泥路面白改黑、钢桥路面反射裂缝问题。结果表明,通过优质的70#A级或90#A级基质沥青,添加足够比例的SBS改性剂、稳定剂、抽出油等制作成的高弹性SBS改性沥青,能够作为应力吸收层解决反射裂缝问题。因具备高粘度、高强度性能,也可广泛应用于钢桥面,水泥路面防水粘结层。     

耐黄变丁苯热塑性弹性体研制

研究了充油SBS产品中各组份对黄变性能影响,发现充油SBS产品容易变黄的主要原因是油品中存在较多稠环芳烃,而与SBS分子自身的化学组成与结构无关。增加抗氧剂的浓度或使用更优良的抗氧剂1076都只能轻微减缓产品的变黄速度。采用芳烃含量极低的加氢型环烷填充油或添加适当的光稳定剂可以显著改善产品的耐黄变性能。     

基于储存稳定性的橡胶改性沥青制备工艺

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。     

Effect of montmorillonite on properties of styrene–butadiene–styrene copolymer modified bitumen

Clay/styrene–butadiene–styrene (SBS) modified bitumen composites were prepared by melt blending with different contents of sodium montmorillonite (Na‐MMT) and organophilic montmorillonite (OMMT). The structures of clay/SBS modified bitumen composites were characterized by XRD. The XRD results showed that Na‐MMT/SBS modified bitumen composites may form an intercalated structure, whereas the OMMT/SBS modified bitumen composites may form an exfoliated structure. Effects of MMT on physical properties, dynamic rheological behaviors, and aging properties of SBS modified bitumen were investigated. The addition of Na‐MMT and OMMT increases both the softening point and viscosity of SBS modified bitumens and the clay/SBS modified bitumens exhibited higher complex modulus, lower phase angle. The high‐temperature storage stability can also be improved by clay with a proper amount added. Furthermore, clay/SBS modified bitumen composites showed better resistance to aging than SBS modified bitumen, which was ascribed to barrier of the intercalated or exfoliated structure to oxygen, reducing efficiently the oxidation of bitumen, and the degradation of SBS. POLYM. ENG. SCI., 47:1289–1295, 2007. © 2007 Society of Plastics Engineers     

Preparation and properties of bitumen modified with the maleic anhydride grafted styrene‐butadiene‐styrene triblock copolymer

A procedure to improve the properties of styrene‐butadiene‐styrene (SBS) copolymer modified bitumen by grafting of maleic anhydride (MAH) onto SBS in the presence of benzoyl peroxide (BPO) as initiator was proposed. The effects of the grafting degree (GD) on the properties of modified bitumen were investigated. FTIR spectroscopy was employed to verify the grafting of MAH onto SBS. The GD of MAH onto SBS was determined by a back titration procedure. To assess the effects of the GD of grafted SBS on properties of modified bitumen, the softening point, penetration, ductility, elastic recovery, penetration index, viscosity, storage stability, and dynamic shear properties were tested. Experimental results indicated that the SBS grafted with maleic anhydride (SBS‐g‐MAH) copolymer was successfully synthesized by solvothermal method, and different GD of the SBS‐g‐MAH was obtained by control the MAH concentration. The GD of the MAH onto SBS has great effect on the rheological properties of the modified bitumen, and the high temperature performance and storage stability of modified bitumen were improved with the GD of the MAH onto SBS increasing. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers     

Evaluation of the properties of bitumen modified by SBS copolymers with different styrene–butadiene structure

Four styrene–butadiene–styrene(SBS) modified bitumens had been prepared by a base bitumen, a crosslinking agent and four SBS copolymers which differ in styrene blocks content and molecular configuration (radial or linear) under the same experimental conditions. Conventional properties, morphology, thermal behavior and microstructure were investigated by means of conventional tests, fluorescence microscopy, differential scanning calorimetry (DSC), and Fourier transform infrared (FT‐IR) spectroscopy. In terms of linear SBS polymers, the SBS molecule with the styrene content of 30% has a perfect dispersion and complete stretching in bitumen matrix, and in this case, the conventional properties and thermal stability of bitumen are enhanced substantially. However, the star SBS polymer due to long branched chains forming the preferable steric hindrance to enhance the intensity of base bitumen, plays a more important role in improving the conventional properties of base bitumen than linear SBS polymers. Furthermore, the FT‐IR spectra indicate that, the main bands assignations of four modified bitumens are identical and the significant variation is the peak intensity. And a noncomplete crosslinking reaction happens between the bitumen and each SBS polymer, which can efficiently prevent excessive cross‐linking from affecting the intrinsic bitumen characteristics. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40398.     

影响SBS改性沥青延度的因素探讨

通过对SBS牌号、沥青牌号、SBS加入量、改性沥青加工工艺等方面对SBS改性沥 青延度影响的试验研究,分析了影响SBS改性沥青延度的主要因素,提出了提高改性沥青低温延 度的方法。     

Rheological properties of styrene butadiene styrene polymer modified road bitumens

The use of polymers for the modification of bitumen in road paving applications has been growing rapidly over the last decade as government authorities and paving contractors seek to improve road life in the face of increased traffic. Currently, the most commonly used polymer for bitumen modification is the elastomer styrene butadiene styrene (SBS) followed by other polymers such as styrene butadiene rubber, ethylene vinyl acetate and polyethylene. This paper describes the polymer modification of two penetration grade bitumens with SBS. Six polymer modified bitumens (PMBs) were produced by mixing the bitumens from two crude oil sources with a linear SBS copolymer at three polymer contents. The rheological characteristics of the SBS PMBs were analysed by means of conventional as well as dynamic mechanical analysis using a dynamic shear rheometer (DSR). The results of the investigation indicate that the degree of SBS modification is a function of bitumen source, bitumen-polymer compatibility and polymer concentration, with the higher polymer concentrations in a high aromatic content bitumen producing a highly elastic network which increases the viscosity, complex modulus and elastic response of the PMB, particularly at high service temperatures. However, ageing of the SBS PMBs tends to result in a reduction of the molecular size of the SBS copolymer with a decrease in the elastic response of the modified road bitumen.     

沥青改性用SBS市场分析及生产开发建议

通过对国内外苯乙烯类热塑性弹性体SBS产品在制鞋、沥青改性、聚合物改性和粘合剂等方面的市场及消费需求分析,预测了SBS产品在改性沥青行业的需求情况和发展趋势。随着国内高等级高速公路的快速发展,我国对改性沥青用SBS的需求量将会有较大的增长。针对我国目前的生产实际情况,提出了下一步改性沥青用SBS的生产开发建议。     

Evaluation of rheological and image properties of styrene‐butadiene‐styrene and ethylene‐vinyl acetate polymer modified bitumens

This article presents a laboratory evaluation of conventional, fundamental, rheological, and morphological characteristics of styrene‐butadiene‐styrene (SBS) and ethylene vinyl acetate (EVA) polymer modified bitumens. Polymer modified bitumen (PMB) samples have been produced by mixing a 50/70 penetration grade unmodified (base) bitumen with SBS and EVA copolymer at different polymer contents. The fundamental viscoelastic properties of the PMBs were determined using dynamic (oscillatory) mechanical analysis and presented in the form of temperature and frequency‐dependent rheological parameters. The morphology of the samples as well as the percent area distribution of polymers throughout the base bitumen have been characterized and determined by means of fluorescent light optic microscopy and Qwin Plus image analysis software, respectively. The results indicated that polymer modification improved the conventional and rheological properties of the base bitumen. It was also concluded that the temperature and frequency had a significant effect on complex modulus of PMBs. The behavior of EVA and SBS PMBs had exhibited quite difference at 50°C. Moreover, it was found out that at low polymer contents, the samples revealed the existence of dispersed polymer particles in a continuous bitumen phase, whereas at high polymer contents a continuous polymer phase has been observed. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Evaluation of physical,rheological, and structural properties of vulcanized EVA/SBS modified bitumen

In this study, the performance and modification mechanism of EVA (ethylene‐vinyl‐acetate) modified (EM), EVA/SBS (Styrene‐Butadiene‐Styrene) modified (ESM), and EVA/SBS/sulfur modified (ESSM) bitumens were evaluated. The physical, rheological, morphological, and structural properties were determined before and after aging, and compared with those of base bitumen. These properties were evaluation using conventional physical methods, Fourier transform infrared spectrometer, optical microscopy, dynamic shear rheometer, and bending beam rheometer, respectively. The results showed that sulfur was useful in bitumen, EVA, and SBS modification by forming a vulcanized crosslinking polymer network. The vulcanization improved most of the physical properties of ESM bitumen, especially high‐ and low‐temperature performance, and toughness and tenacity (previously not evaluated in the literature). Meanwhile, vulcanization improved the compatibility between polymers and bitumen and increased the aging resistance of ESM bitumen. Vulcanization reactions took place without new functional groups being presented in the infrared spectrum. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44850.     

Effect of material composition on nano-adhesive characteristics of styrene-butadiene-styrene copolymer-modified bitumen using atomic force microscope technology

To investigate the effect of the raw material composition on the nano-adhesive characteristics of styrene-butadiene-styrene (SBS) copolymer-modified bitumen, force-distance curves were obtained to examine the nano-adhesive forces of SBS-modified bitumen samples prepared using different virgin bitumen types, SBS modifiers, an extraction oil, and a stabilizer using atomic force microscopy (AFM). The influence of the composition of the raw materials, such as the virgin bitumen, SBS modifier, extracting oil, and stabilizing agent contents, on the cohesive characteristics were discussed for SBS-modified bitumen. The results show that force-distance curves obtained using AFM can be used to gain insight into nano-adhesive forces of SBS-modified bitumen samples. The force-spectrum technique using AFM can be used to obtain the nano-adhesive forces of the SBS-modified bitumen samples. Neat bitumen has good compatibility with a SBS modifier, which is suitable for forming SBS-modified bitumen with an increased nano-adhesive force. The nano-adhesive force of the branched-shaped SBS-modified bitumen was larger than that of linear-shaped SBS-modified bitumen. The nano-adhesive force of SBS-modified bitumen increased as the SBS modifier and stabilizer contents increased. The nano-adhesive force of the SBS-modified bitumen decreased when the extraction oil content increased.     

Influence of styrene-butadiene-styrene polymer modification on bitumen viscosity

Effects of polymer content/structure and bitumen type on viscosity characteristics of styrene-butadiene-styrene (SBS) polymer modified bitumens were investigated. The study indicated that SBS polymers were not inert additives and increases in kinematic and dynamic viscosities of the modified bitumens were not directly proportional to polymer content; a marked viscosity increase was observed when the polymer content increased from 3 to 6% by weight of the blend. Modification with a sufficiently high polymer content also increased the degree of non-Newtonian behaviour of the bitumens. The base bitumens and modified bitumens containing 3% SBS were observed to be essentially shear rate independent, while those containing 6 or 9% SBS displayed shear-thinning behaviour. Compared to the modified bitumens with linear SBS, the modified bitumens with branched SBS demonstrated a higher degree of shear-thinning behaviour. These effects were dependent on ranges of shear rate and temperature. The increased degree of non-Newtonian behaviour was observed to influence the correlations between kinematic and dynamic viscosities.