聚氨酯改性环氧树脂沥青混合料的性能研究
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摘要
采用环氧开环法制备聚氨酯改性环氧树脂,改变聚氨酯的掺量,测试聚氨酯改性环氧树脂沥青混合料的高、低温稳定性和水稳定性。结果发现,聚氨酯与环氧树脂发生环氧开环聚合后,产生较多的柔性支链,可降低环氧树脂的低温脆性;聚氨酯的添加对环氧树脂沥青混合料的高温性能影响不大,但可明显提升混合料的低温弯拉应变水平;当聚氨酯掺量占环氧树脂质量的30%时,混合料的性能最佳,运用此改性混合料可明显减少桥面铺装中的早期低温开裂病害。
Polyurethane modified epoxy resins are prepared by epoxy ring-opening method, which changes the content of polyurethane. The high and low temperature stability and water stability of epoxy resin and asphalt mixture modified by polyurethane are tested. The results show that the epoxy ring-opening polymerization of polyurethane and epoxy resin occurs,and many flexible branched chains are produced, which could reduce the brittleness of epoxy resin at low temperature. The addition of polyurethane has little effect on the high temperature performance of epoxy resin asphalt mixture, but it can obviously improve the low temperature bending strain of the mixture. When the polyurethane content accounts for 30% of the epoxy resin quality, the performance of the mixture is the best. The early low temperature cracking hazard of bridge deck pavement can be reduced by using the modified mixture.
Polyurethane modified epoxy resins are prepared by epoxy ring-opening method, which changes the content of polyurethane. The high and low temperature stability and water stability of epoxy resin and asphalt mixture modified by polyurethane are tested. The results show that the epoxy ring-opening polymerization of polyurethane and epoxy resin occurs,and many flexible branched chains are produced, which could reduce the brittleness of epoxy resin at low temperature. The addition of polyurethane has little effect on the high temperature performance of epoxy resin asphalt mixture, but it can obviously improve the low temperature bending strain of the mixture. When the polyurethane content accounts for 30% of the epoxy resin quality, the performance of the mixture is the best. The early low temperature cracking hazard of bridge deck pavement can be reduced by using the modified mixture.
引文
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[7]陈利东,李璐,郝增恒.聚氨酯-环氧树脂复合改性沥青混合料的研究[J].公路工程,2013,38(2):214-218.
[8]卜鑫德,程烽雷.聚氨酯-环氧复合改性沥青及其路用性能研究[J].公路,2016(8):171-174.
[2]黎兵,王焕,许戈文.环氧树脂用KH550开环改性水性聚氨酯涂料的合成及性能研究[J].涂料工业,2010,40(3):1-5.
[3]唐鑫强,成煦,杜宗良.环氧树脂改性水性聚氨酯的制备及性能研究[J].塑料工业,2014,42(8):41-45.
[4]董伟,陈政,辛中印,等.环氧树脂改性水性聚氨酯皮革涂饰剂的性能研究[J].皮革科学与工程,2011,21(4):45-49.
[5]戴震,刘浏,黎兵,等.环氧树脂改性水性聚氨酯合成与表征[J].环球聚氨酯,2010(1):56-58.
[6]陈鹭,郑林禄,郑玉慈.环氧树脂改性水性聚氨酯的研究进展[J].化学工程与装备,2014(11):169-172.
[7]陈利东,李璐,郝增恒.聚氨酯-环氧树脂复合改性沥青混合料的研究[J].公路工程,2013,38(2):214-218.
[8]卜鑫德,程烽雷.聚氨酯-环氧复合改性沥青及其路用性能研究[J].公路,2016(8):171-174.