Investigation of anti-aging of SBS modified bitumen containing surface organic layered double hydroxide.
Investigation of anti-aging of SBS modified bitumen containing surface organic layered double hydroxide.
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为提高SBS改性沥青的抗老化性能，制备了十六烷基三甲氧基硅烷有机改性层状双氢氧化物（LDH），并将其用于SBS改性沥青的改性。X射线光电子能谱分析表明，十六烷基三甲氧基硅烷通过化学键接在LDH上。与LDH相比，有机LDH（OLDH）的亲水性明显降低，由于LDH表面羟基的减少和有机官能团的引入，使OLDH在SMB中具有更好的稳定性和稳定性。OLDH和LDH的加入均能改善SMB的高温性能，尤其是OLDH。老化后沥青发生氧化，SBS发生降解，导致SMB的物理和流变性能恶化。LDH可以缓解老化对SMB性能和化学结构的破坏。十六烷基三甲氧基硅烷有机改性后，LDH对SMB抗老化性能的改善作用进一步增强。OLDH对SBS改性沥青的热氧老化和紫外老化性能有很好的改善作用。
To improve the anti-aging ability of SBS modified bitumen (SMB), layered double hydroxide (LDH) organically modified by hexadecyltrimethoxysilane was prepared and utilized for the modification of SMB. According to X-ray photoelectron spectroscopy, hexadecyltrimethoxysilane has been grafted into LDH through chemical bonding. Compared with LDH, the hydrophilicity of organic LDH (OLDH) was obviously reduced, and OLDH possessed better dispersibility and stability in SMB, because of the decrease of hydroxyl and the introduced organo-functional groups on the surface of LDH. The addition of OLDH and LDH can ameliorate the high temperature behavior of SMB, especially OLDH. After aging, bitumen was oxidized and SBS was degraded, which resulted in the physical and rheological property deterioration of SMB. LDH can alleviate the destruction of aging on the performance and chemical structure of SMB. Furthermore, the improvement of LDH on the anti-aging ability of SMB has been further enhanced after hexadecyltrimethoxysilane organic modification. OLDH exhibits excellent improvement on the thermo-oxidative aging and ultraviolet aging resistance of SBS modified bitumen.
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