涂料大致可以分为液体涂料、粉末涂料和干涂层等三种形态,对于每种类型的涂料而言,密度都是一项非常重要的指标。对于液体涂料密度,其测试方法有比重杯法、落球法、振动法、压力杯法及比重计法等5种;对于粉末涂料密度,其测试方法有气体置换法和液体置换法等2种;对于干涂层密度,其测试方法有使用涂层试板施涂后通过阿基米德法测定和直接通过阿基米德法测定等2种。本文对每种测试方法的特点、准确性及应用现状进行了详细阐释。

Coatings can be roughly divided into liquid coatings,powder coatings and dry coatings.For each type of coating,the density is a very important index.For the density of liquid coating,there are five test methods,such as specific gravity cup method,immersed body method,oscillation method,pressure cup method and areometer method.For powder coating density,the test methods include gas replacement method and liquid replacement method.For dry coating density,the test methods include using a coated test panel to determine dry flm density by the Archimedes principle and to determine directly by Archimedes principle.In this paper,the characteristics,accuracy and application status of each test method were explained in detail.