Three test methods for coating film application performance

Usually the method of testing the performance of coatings cannot be used to calculate the basic mechanical properties, but to test the combination . These methods fall into two categories: those suitable for predicting real-world performance and those suitable for quality control. Paint film testing falls into three categories: outdoor exposure, laboratory simulation, and empirical testing.

(1) Outdoor exposure test

A surefire way to understand the performance of a paint film is to observe it in extensive use. However, its performance needs to be predicted before it can be used in large quantities. Generally, it is actually used under extremely severe conditions to observe the performance of the paint film by accelerating damage. The smaller, more limited the number of , and the greater the acceleration, the less reliable the predictions will be. A variety of road marking paints can be painted on a short road at the same time, and the performance of their paint films can be compared after being driven by the same vehicle . Films of known properties are tested with new coatings, and pilot tests are carried out at different seasons of the year, on roads of different materials (concrete or asphalt). Newly painted cars are driven over gravel roads, over water beaches, and valued in different weather conditions. Canned paint should be inspected for damage to the paint film on the inner wall and the smell of the canned product during storage.

(2) Laboratory simulation test

When laboratory simulation evaluates the known performance of the paint film, it is necessary to establish a series of standards from poor to excellent, and it is also necessary to check whether the information obtained in the experiment is applicable, and what is the confidence given by repeated experiments.

The stone chip resistance Tester is used in the automobile industry to evaluate the stone chip resistance of the paint film, and the standard gravel or projectile is shot on the surface of the paint film under standard conditions with compressed air. These tests are compared with actual results to give reasonable predictions of actual performance. A more sophisticated anti-stone impact instrument, which can change the angle and speed of the impact and the temperature.

Simulation tests are mostly used for performance prediction rather than quality control, because the testing of products in production is required to be completed in a very short time. The simulation test of paint film performance generally can only test one or several properties, and other test assistance is needed to predict the overall performance of paint film .

(3) Empirical test

Tests for coatings are mostly empirical. The test results of the paint film can be used as part of the data to predict the performance of the paint film. Most of these

The mechanical test of the paint film not only tests the viscoelasticity of the paint film, but also tests the adhesion of the paint film to the substrate. Since the viscoelasticity of the paint film is affected by temperature and time, when testing the paint film, the speed of temperature change and deformation need to be determined according to the actual the goal of.