意义和用途

4.1 The control of water content is generally important for controlling the performance of paints and paint components, as well as for controlling the content of volatile organic compounds (挥发性有机化合物).

4.2 Coatings are generally insoluble in common Karl Fischer solvents such as methanol. Pyridine has been found to be an almost universal solvent for these materials. 然而, the Karl Fischer reaction in this solvent is too slow at room temperature. To speed things up, 1-ethyl piperidine was added at a concentration of 5% as a buffer or “catalyst”.

4.3 For nonpyridin-based reagents, many different solvent systems can be used to increase solubility and minimize ketone and aldehyde interference.

ASTM D4017-02-2015 用卡尔费休法测定油漆和油漆材料中水份的标准测试方法

范围

1.1 This test method is applicable to all paints and coatings, including resins, monomers and solvents, except aldehydes and certain active metals, metal oxides and metal hydroxides. Although the evaluation is limited to colored products with water content in the range of 30% 到 70%, there is reason to believe that higher and lower concentrations can be determined by this test method.

1.2 以 SI 单位表示的值应被视为标准值. 括号内的数值仅供参考.

1.3 本标准并非旨在解决与使用相关的所有安全问题. 本标准的使用者有责任在使用前制定适当的安全和健康措施并确定监管限制的适用性. 具体危害说明见章节 7.

ASTM D4017-02-2015 用卡尔费休法测定油漆和油漆材料中水份的标准测试方法

2. 参考文档

ASTM标准

D1193 试剂水规格

D3960 Method for determination of volatile Organic Compounds (挥发性有机化合物) 油漆和相关涂料中的含量

E180 Practice for determining the accuracy of ASTM methods for the analysis and testing of industrial and specialty chemicals

E203 Method for testing water using Karl Fischer volumetric titration