Modern industrial products, such as vehicles, machine tools, construction machinery and industrial equipment, are often in contact with various petroleum products, such as gasoline, lubricating oil, transformer oil, etc. Coating films for these objects need to be resistant to the aggressive action of these petroleum products. Different products specify resistance standards for different petroleum products, the most common of which is gasoline resistance. For marine paint, its resistance to diesel and lubricating oil is mainly investigated.
The test of gasoline resistance is to measure the resistance of the coating film to gasoline, that is, to test under the specified conditions to observe whether the coating film has discoloration, loss of gloss, whitening, foaming, softening, falling off, etc., and to restore the original state. degree of difficulty. According to the national standard GB/T1734-93.0.0 Determination method of gasoline resistance of paint film 0.3, the inspection method is divided into two kinds: soaking gasoline and pouring gasoline, both of which are suitable for intermittent and short-term action of gasoline on the paint film. The occasion on the paint film. During the gasoline immersion method test, 2/3 of the area of the test plate is also immersed in the gasoline specified in the product standard, and then it is taken out for inspection. Pour some gasoline on the test plate, and after the specified time, put gauze and weight on the paint film to observe whether the gauze sticks to the paint film. The specified test temperature is 23°C±2°C. For occasions where gasoline often acts on the paint film for a long time, it is better to conduct a quick test in gasoline with boiling point.
Other test methods for lubricating oil resistance and transformer oil resistance are basically the same.
For the paint film of the container used to store petroleum products, in addition to testing the resistance of the paint film to petroleum products, it is also necessary to test the influence of the paint film on the quality of petroleum products. Generally, the inspection method is specified in the coating product standard.
