为解决废旧聚乙烯(WPE)的回收应用问题和满足道路对沥青改性剂的需求,开展了WPE改性沥青相关研究。采用异佛尔酮二异氰酸酯(IPDI)对WPE进行化学改性,合成了改性剂废旧聚乙烯接枝甲基丙烯酸羟乙酯-异佛尔酮二异氰酸酯(WPE-g-HI)改性剂,探究了掺杂量不同的WPE-g-HI对改性沥青性能的影响。通过傅里叶变换红外光谱仪、接触角测量仪、热重分析仪对改性剂的结构和性能进行表征。利用三大基本指标(25℃针入度、5℃延度、软化点)及布氏旋转黏度试验研究了改性沥青的物理性能,并使用动态剪切流变仪分析改性沥青的流变性能。结果表明:WPE-g-HI改性沥青具有疏水性和可加工性;WPE-g-HI改性沥青的高温稳定性和低温抗裂性能得到改善,WPE-g-HI掺杂量为5%(质量分数)时改性沥青性能较好。原因是WPE-g-HI中的—NCO与沥青的—OH发生化学反应形成氨酯键,从而使改性沥青的化学结构更加稳定,进而提升了其性能。与WPE改性沥青相比,WPE-g-HI改性沥青的复合剪切模量和车辙因子均增大,相位角降低,说明其具有更好的弹性恢复能力和抗车辙能力。
In order to solve the problem of recycling application of waste polyethylene (WPE) and to meet the demand for asphalt modifiers for roads,research related to WPE-modified asphalt was carried out.Isophorone diisocyanate (IPDI) was used to chemically modify WPE,and the modifier WPE-g-HI (waste polyethylene grafted with hydroxyethyl methacrylate-isophorone diisocyanate) was synthesised.The effects of WPE-g-HI with different doping amounts on the properties of modified asphalt were investigated.The structure and properties of the modifiers were characterised by Fourier transform infrared spectroscopy,contact angle measurement instrument and thermogravimetric analyser.The physical properties of the modified asphalt were investigated using the three basic indexes (25℃penetration,5℃ ductility,and softening point) and Brinell rotational viscosity tests,and the rheological properties of the modified asphalt were analysed using a dynamic shear rheometer.The results showed that:WPE-g-HI modified asphalt had hydrophobicity and processability,and its high temperature stability and low temperature crack resistance were improved.The performance of WPE-g-HI modified asphalt was better when the doping amount of WPE-g-HI was 5% (mass fraction).The reason was that the chemical reaction between —NCO in WPE-g-HI and —OH in asphalt formed urethane bond,which made the chemical structure of modified asphalt more stable,thus improving its performance.Compared with WPE-modified asphalt,the composite shear modulus and rutting factor of WPE-g-HI-modified asphalt increased,and the phase angle decreased,indicating better elastic recovery and rutting resistance.
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基金资助
新疆维吾尔自治区青年基金(2023D01C194);新疆维吾尔自治区昌吉州两区科技发展计划(2023LQG03)
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