目的 解决传统道路标线在实际应用中存在的夜间能见度差和引导效果不佳的问题。方法 使用加热共混法,将长余辉发光材料、填料和助剂与热熔石油树脂混合,在设定温度下加热至完全溶解,制备出一种新型热熔荧光涂料。随后,将气相纳米二氧化硅与乙酸乙酯混合均匀,制得疏水改性溶液,并使用浸涂法在热熔荧光涂料表面添加了一层疏水涂层,使涂料在兼顾优良荧光性能的同时,展现出卓越的疏水性,并使其具备优异的抗污和自清洁特性。利用X射线衍射、场发射扫描电子显微镜、分光光度计和接触角测量仪,对涂料物相组成、横截面微观形貌与元素分布、发光性能和疏水性能进行了测试。最后,测试了热熔荧光疏水涂料的自清洁性能和抗污性能。结果 获得热熔荧光涂料的最佳配比（质量分数）,即C5石油树脂含量为42%、荧光粉含量为25%、玻璃微珠含量为30%、助剂含量为3%,此配方制备的自发光涂料经日光激发2 h后,余辉时间可持续8 h。当涂料在纳米二氧化硅溶液中疏水改性2 min时,其发光性能达到最佳状态,其接触角可达153.279°。结论 这种具有自清洁功能的长效自发光涂料既能极大缩短标线施工时间,又能够改善公路夜间照明条件,达到节约能源和减少人力维护成本的目的,助力实现智慧公路理念。
Abstract
To address the issue of unfavorable visibility of traditional traffic index lines during the night, that is, the index may perform much worse on guiding drivers in dark circumstances, long afterglow luminescent materials have been innovatively applied to the procedure of creating traffic index lines in recent years. These materials possess a characteristic of self-illuminating, particularly at night, which contributes to their outstanding visibility and significantly promotes the nighttime performance of traditional road markings. However, existing self-luminous coatings still have several drawbacks. For instance, the period for coating solidification is relatively long. Since the coating surface is prone to dirt, the luminescent performance will be diminished. By utilizing a heating and blending method, the work aims to prepare a novel thermoplastic fluorescent coating. A hydrophobic coating is applied to the surface of the thermoplastic fluorescent coating by means of the dip coating method. Therefore, the coating not only maintains excellent fluorescent properties, but also exhibits outstanding hydrophobicity, endowing itself with superior anti-fouling and self-cleaning capabilities. The phase composition of the coating was analyzed thoroughly by X-ray diffraction (XRD). The microstructural morphology of the specimens was examined by field emission scanning electron microscopy (FE-SEM). Tests were carried on on luminescent performances of specimens and results were demonstrated by the excitation spectrum, emission spectrum, and afterglow spectrum. The afterglow attenuation curves of different compositions were also analyzed. With the intention of evaluating the hydrophobicity, the contact angles between the coating surface and the droplet were measured and it was found that the droplets would not infiltrate the coating surface. In addition, self-cleaning capabilities and anti-fouling properties of specimens were compared. The droplet sliding process between hydrophobic modified coatings and non-hydrophobic modified coatings with soil on their surfaces was also compared. Through various categories of experiments mentioned previously, the optimal formulation of the thermoplastic fluorescent coating was determined. The ideal composition was obtained through a series of experiments, which consisted of approximately 42wt.% of C5 petroleum resin, 25wt.% of fluorescent powder, 30wt.% of glass beads, and 3wt.% of additives. The self-luminous coating, after being exposed to sunlight for 2 hours, can sustain an afterglow for 8 hours, which is sufficient for the requirement of nighttime road marking guidance. As long as the coating is changed hydrophobically in a nanosilica solution for two minutes, it will glow pretty well, and its hydrophobic property will be great, with a contact angle of 153.279° between the surface and the droplet. This long-lasting, self-luminous coating with self-cleaning capabilities can significantly cut down the time required to produce traffic index lines and enhance nighttime illumination for highways, thereby contributing to energy conservation and lowering labor maintenance costs. By the way, it benefits both the environment and humans, in line with the concepts of energy saving, emission reduction, low carbon, and environmental friendliness. Consequently, the application of this long-lasting, self-luminous coating with self-cleaning capabilities is bound to support the realization of smart highway concepts, promoting the safety, efficiency, and convenience of road traffic, as well as providing a better travel experience for drivers and pedestrians.
关键词
热熔荧光涂料 /
长余辉 /
疏水 /
自清洁 /
道路标线 /
智慧公路
Key words
thermoplastic fluorescent coating /
long afterglow /
hydrophobic /
self-cleaning /
road marking /
smart highway
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