基于丝网印刷的石墨烯印刷机干燥系统研究

Drying System of Graphene Printing Machine Based on Screen Printing

目的用石墨烯发热板代替红外灯管作为上光机干燥设备的热源,筛选出用于印刷干燥的石墨烯发热板的最佳实验方法和制备工艺。方法文中通过分析与研究水性上光油干燥需求,设计水性上光机干燥控制系统,采用丝印技术制备了石墨烯干燥加热源。文中采用单因素实验法研究溶剂类型、固化温度以及涂层厚度分别对发热板导电性能及固化效果的影响,并对发热源进行通电试验研究其导电、导热性能。结果实验表明纯净水作为溶剂更容易得到牢固性、平滑性良好的导电涂层,高温烧结温度为465~480℃时石墨烯电热涂层固化达到上光机干燥系统的需求,厚度为5~20μm的涂层可同时满足发热板的导电性和牢固性。发热板平均阻值随涂层厚度、碳的质量分数的增加呈下降趋势。发热板通电时间越长、电流越大、电阻越大,发热板产生的热量越高,干燥源温升越高。结论研究表明石墨烯具有良好的导电、导热性,得到了石墨烯发热板合理的制备工艺和方法。为将石墨烯加热源应用于印刷干燥领域提供了方案,为将丝网印刷技术引入绿色干燥系统提供了技术支撑。

A graphene heating plate is proposed to replace the infrared lamp as the heat source of the drying equip-ment of the glazing machine,and the best experimental method and preparation process of the graphene heating plate for printing and drying are screened out.By analyzing and researching the drying requirements of water-based glazing oil,the drying control system of water-based glazing machine was designed,and the graphene drying heating source was pre-pared by screen printing technology.The single factor experiment method was used to study the impact of solvent type,curing temperature and coating thickness on the electrical conductivity and curing effect of heating plate,and conduct energization test to study the electrical and thermal conductivity of the heating source.The experimental results indicated that pure water could be used as a solvent to obtain a conductive coating with good firmness and smoothness.When the high sintering temperature was between 465℃and 480℃,the curing of the graphene electrothermal coating met the re-quirements of the drying system of the glazing machine,and the coating with a thickness of 5-20μm could meet the con-ductivity and firmness of the heating plate at the same time.The average resistance of the heating plate showed a down-ward trend with the increase of coating thickness and carbon mass fraction.As the heating plate was energized for a longer time,the current and the resistance became larger and the heat generated by the heating plate and the temperature rise of the drying source became higher.The research shows that grapheme has good electrical and thermal conductivity,and a reasonable preparation process and method for the grapheme heating plate are obtained.It provides a solution for the ap-plication of graphene heating sources in the field of printing and drying,and offers technical support for the introduction of screen printing technology into the green drying system.