ABS塑胶基材用水性UV固化涂料施工工艺研究

Study of Application Technology of Water-Based UV-Curable Coating on Plastic Substrates

为了解决水性UV固化涂料因为烘烤及固化过程中的高温导致基材变形的问题,以及研究施工工艺对漆膜性能的影响,首先采用炉温跟踪仪、数显测厚规等,通过测试水分挥发率研究了烘烤工艺及漆膜膜厚对水分挥发率的影响;其次,采用紫外光谱分析仪、傅立叶变换红外光谱仪、UV能量计等系统研究了固化过程中UV能量对漆膜性能的影响及温度变化等。结果表明:当膜厚小于30μm时,随着烘烤温度及烘烤时间的增加,水分挥发率逐渐提高。在适当的烘烤条件下,漆膜固化前水分挥发率大于95%时,漆膜性能优异。当固化能量在600~1400 mJ/cm^(2)范围内,双键转化率达到90%以上。然而因为汞灯产生的高温导致UV室温度在短时间内升高,不利于塑胶基材的应用,加装隔热片后UV室温度明显降低。

In order to solve the problem of substrate deformation caused by the high temperature in the baking process and investigate the effect of application process on waterbased UV curing coatings.Firstly,by use of the furnace temperature tracker,digital film thickness tester and the moisture volatilization rate tester to study the effect of water volatilization rate on baking process and film thickness.Secondly,the UV spectrum analyzer,Fourier transform infrared spectrometer and UV energy meter were used to systematically study the effect of the UV energy on the coatings film properties and temperature change in the UV chamber during the curing process of the coatings.The results showed that when the film thickness was lower than 30μm,as the baking temperature and time increased,the moisture volatilization rate gradually increased.Under proper baking conditions,the coatings showed excellent performance when the moisture volatilization rate of coating was higher than 95%.When the curing energy was in the range of 600~1400 mJ/cm2,the double bond conversion rate was over 90%.However,the temperature of the UV chamber was rised in a short time due to the high temperature generated by the mercury lamp,which was unfavorable to the application on plastic substrates.The temperature of the UV chamber could be significantly reduced by installing heat insulation sheets.