Study on Preparation and Properties of Graphene/Carbon Fiber Waterborne Electrothermal Coatings
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摘要: 电热涂料是在导电涂料的基础上开发出的一种直接将电能转化为热能或辐射能的功能性涂料. 研究一种以改性碳纤维和石墨烯为导电填料的水性环氧双组分发热涂料体系. 利用扫描电子显微镜（SEM）对涂层表面和断面进行表征，发现碳纤维在涂层中分布均匀，形成良好的导电传热网络. 导热测试结果显示涂层的导热系数为0.40 W /（m·K）；涂层的温升曲线分3个阶段规律增长，升温在15~28 min达到峰值，理论热效能高达63.02%；涂层的安全电压为24 V，并具有良好的绝缘性能，能够保障使用安全.Abstract: Electrothermal coating is a kind of functional coating which can directly convert electric energy into heat or radiation energy on the basis of conductive coating. A waterborne epoxy two-component thermal coating system with modified carbon fiber and graphene as conductive filler was studied. Scanning electron microscopy (SEM) was used to characterize the surface and section of the coating. It was found that the carbon fibers were evenly distributed in the coating, forming a good conductive and heat transfer network.The thermal conductivity test results show that the thermal conductivity coefficient of the coating is 0.40 W / (m·K). The temperature rise curve of the coating increased regularly in three stages, and reached the peak value in 15~28 min, and the theoretical thermal efficiency reached 63.02%. The safe voltage of the coating is 24 V, and it has good insulation performance, which can guarantee the use safety.
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Key words:
- electrothermal coatings /
- carbon fiber /
- graphene /
- waterborne coatings /
- safety performance
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图 2 导电发热涂层测试装置
1—发热面板；2—铜电极；3—温度传感器；4—温度控制器；5—变压器.
Figure 2. Test device for electrothermal coatings
图 6 恒温恒湿初始条件时发热面板涂层EC-321G的温升曲线和升温速率
Figure 6. Heating curves and heating rate of EC-321G on heating panel under initial conditions of constant temperature and humidity
图 7 恒温恒湿条件下发热面板涂层EC-321G的温升曲线和升温速率
Figure 7. Heating curves and heating rate of EC-321G on heating panel under constant temperature and humidity conditions
图 9 发热面板涂层EC-321G的温度与空气温度的时间变化曲线
Figure 9. Temperature change curves of heating panel coating EC-321G and air temperature over time
表 1 导电发热涂层基本性能
Table 1. Basic properties of electrothermal coatings
颜色 光泽度（60°） / (°) 硬度 反射率 / (°) 附着力（百格法） 黑色 0.7 5H 2.2 0 级 
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表 2 涂层导热系数
Table 2. Thermal conductivity of coating
样品名称 样品厚度 / mm 样品面积 / mm2 热流量 / W 样品热阻 / （cm2·K·W−1） 导热系数 / （W·(m·K)−1） EC-321G 1.00 706.86 3.57 29.49 0.40 空白 1.00 706.86 2.30 91.54 0.24
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