聚丙烯酸酯热塑性弹性体替代SBS用于改性沥青
山东建筑大学, 交通工程学院, 山东济南 250101
| 摘 要： | 聚（苯乙烯-丁二烯-苯乙烯）嵌段共聚物（SBS）是用于改性沥青的最常见的一种热塑性弹性体（TPE），其聚丁二烯嵌段的不饱和双键易交联和老化，影响改性沥青的性能和使用寿命。为解决该问题，采用丙烯酸酯软单体代替丁二烯，用高玻璃化转变温度(Tg)的硬单体代替苯乙烯，设计新型TPE，以改善软链段的化学稳定性和提高改性沥青的高低温性能。首先综合单体价格和Tg筛选出了用于柔性嵌段和刚性嵌段的单体，分析了各单体的聚合方法。然后总结和比较了采用刚性和柔性单体制备嵌段型TPE的聚合方法、拓扑结构，最适宜的拓扑结构为线型或梳型。对于线型TPE，宜采用活性聚合方法，每个嵌段选用单体进行共聚以调节Tg。对于梳型TPE，建议的合成路线为：先制备出遥爪接枝链，然后进行自由基共聚合。最后，提出了几种制备遥爪接枝链的方案。通过总结现有单体、聚合方法和引发剂分子结构等，提出了聚丙烯酸酯热塑性弹性体的合成方案；为替代SBS的聚丙烯酸酯热塑性弹性体的制备、改性沥青的综合性能和使用寿命的提高提供了参考。 |
| 关 键 词： | 热塑性弹性体; 丙烯酸酯共聚物; 长寿命材料; 沥青改性剂; 合成方案 |
| DOI： | 10.57237/j.cse.2022.01.003 |
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收稿日期: 2022-10-26
接受日期: 2022-12-01
在线出版日期: 2022-12-15
Polyacrylate Thermoplastic Elastomer Replacing SBS for Modified Asphalt
School of Transportation Engineering, Shandong Jianzhu University, Jinan 250101, China
| Abstract: | Poly (styrene-butadiene-styrene) block copolymer (SBS) is the most common thermoplastic elastomer (TPE) used for modified asphalt. The unsaturated double bond of its polybutadiene block is prone to crosslinking and aging, which affects the performance and service life of modified asphalt. To solve this problem, acrylate soft monomers are used to replace butadiene, and hard monomers with high glass transition temperature (Tg) are used to replace styrene. Such new TPEs are designed to improve the chemical stability of the soft segment and improve the modification high and low temperature properties of asphalt. Firstly, the monomers used for flexible block and rigid block are screened out based on monomer price and Tg, and the polymerization method of each monomer is analyzed. Then, the polymerization methods and topological structures of block-type TPE prepared by rigid and flexible monomers are summarized and compared. The most suitable topological structure is linear or comb type. For linear TPE, a living polymerization method should be used, and each block is selected for copolymerization with monomers to adjust Tg. For comb-type TPE, the proposed synthetic route is: firstly prepare the telechelic graft chain, and then carry out free radical copolymerization. Finally, several schemes for the preparation of telechelic graft chains are proposed. A synthesis scheme of polyacrylate thermoplastic elastomer is proposed by summarizing the existing monomers, polymerization methods and initiator molecular structures, which provides a guideline for replacing SBS and for improving the comprehensive performance and service life of modified asphalt. |
| Keywords: | Thermoplastic Elastomer; Acrylate Copolymer; Long Life Material; Asphalt Modifier; Synthesis Scheme |
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