The wear resistance of the coating film can be measured by the method in the national standard CB1768-79 "Determination of the Abrasion Resistance of Paint Films". This standard applies to the determination of the abrasion resistance of paint films. Using a paint film abrasion Tester, after a specified number of grinding cycles under a certain load, it is expressed by the weight loss (g) of the paint film.
(1) Materials and equipment
The glass plate (JG40-62) is 3mm thick and 100mm in diameter, and a small hole with a diameter of 9mm is opened in the center.
The balance sense is o.oolg.
Paint film abrasion Tester JM-1 type.
Wheel dresser
Rubber grinding wheel JM-100, JM-120, thickness 10mm, diameter 50mm.
(2) Measurement method
According to GB1727-79 "general preparation method of paint film l11", the sample is brushed and sprayed on the clean and dry base plate. Apply the second coat 24 hours after the first coat of self-drying paint, and dry for 48 hours for the test. After the first coat of volatile paint dries for 2 hours, spray the second coat, and after the last coat, let it dry for 24 hours to test.
Fix the sample plate on the working plate of the wear-resistant instrument, add the required load on the pressing arm (the self-weight of the pressing arm is 200g should be counted) and the refurbished rubber grinding wheel, and add a load equal to the weight of the grinding wheel at the end of the tube. Gently put down the pressurized tube with the balance weight. Put down the vacuum nozzle, and adjust it to 1~1.5mm away from the model. Turn on the main switch, the vacuum cleaner switch, and the turntable switch in sequence. Grind the template for 50 revolutions first to form a relatively flat surface. Turn off the power and take out the model. Gently wipe off the scum with a brush and weigh (accurate to 0.00lg).
Follow the product standard to adjust the counter for testing. When the required number of wear-resistant revolutions is reached, it will stop immediately. Take out the model, wipe off the scum, weigh it, and the difference between the quality before and after is the weight loss of the paint film.
The test was carried out under constant temperature and humidity conditions.
Parallel test twice, each time the difference between the average value is not more than 7% of the average value, the arithmetic mean of the results.
