Determination method of paint film abrasion resistance and its importance

Introduction

In the coatings and varnish industry, it is crucial to understand the wear resistance of paint films. Abrasion resistance is the resistance of paint films to mechanical wear and friction, and it is a key performance indicator for coatings that are susceptible to wear during use. This article will introduce the definition of paint film wear resistance, test methods, related standards and the importance of this test method.

1. Definition, purpose and meaning

The wear resistance of the paint film refers to the resistance of the paint film surface to mechanical wear and friction. It reflects the comprehensive effect of multiple performance parameters such as the hardness, adhesion and cohesion of the paint film. The importance of wear resistance is that it can affect the durability and life of the coating under different environments and service conditions. It is related to factors such as the type of substrate, surface treatment, and temperature and humidity during the drying process of the coating.

In practical applications, wear resistance is often one of the key factors in whether the paint film can remain beautiful and functional for a long time. For example, in the automotive industry, body paint films need to have high wear resistance to resist the impact and scratching of pavement stones. In the furniture industry, the coating on the surface of furniture also needs to be able to withstand wear and tear in daily use to maintain appearance and quality.

2. Relevant standards

In order to accurately measure the wear resistance of paint films, the international standards organization (ISO) and the Chinese National Organization for Standardization (GB/T) have issued a series of related standards. Among them, the GB/T 1768-2006 standard describes a method for testing the wear resistance of paint films by rotating rubber grinding wheels. The standard specifies the test principle, required materials and equipment, operation points, and result representation to ensure the accuracy and repeatability of the test.

3. Introduction to the main points of the inspection method

3.1 Testing principle

The wear resistance test method of the paint film is to use a rubber grinding wheel to wear the paint film, and its wear resistance is expressed by measuring the loss of weight of the paint film after a specified number of revolutions of wear, usually expressed in grams (g). This test principle is based on the mass loss of the paint film when it is subjected to friction and wear.

3.2 Materials and equipment

The following materials and equipment are required for the wear resistance test of paint films:

Wear Tester: used to simulate the wear process of paint film in actual use.

Rubber grinding wheel: used to wear the paint film, and its specifications must meet the standard requirements.

Vacuum device: used to collect dust generated by wear.

Weight: Used to apply a certain load to simulate the wear of the paint film under pressure.

Refining medium: It is used to regularly refinish the rubber grinding wheel to maintain the accuracy of the test.

Calibration Board: Used to calibrate instruments.

Balance: Used to accurately measure mass changes.

3.3 Operation points

When testing the wear resistance of paint films, the following operating points need to be followed:

Calibrate the test instrument and check the condition of the grinding wheel.

Apply the required load to the instrument and regularly refine the rubber grinding wheel.

Fix the test plate on the instrument, after the specified number of revolutions, wipe it clean and weigh it accurately.

If the coating is worn through, an interrupt test is required to measure the wear point and calculate the average mass loss.

3.4 Presentation of results

Based on the test results, the average mass loss of the three panels is calculated, usually accurate to 1 milligram (mg). If the coating is worn through, the average number of revolutions required for the topcoat in the coating or multi-coating system to be worn through can also be calculated to measure the wear resistance of the coating.

Conclusion

The wear resistance of the paint film is a key performance indicator, which is crucial for the quality and performance of coatings and varnishes in different application fields. By using suitable test methods, such as the rotating rubber grinding wheel method, the wear resistance of the paint film can be accurately measured to ensure that the coating has sufficient durability and life in actual use. Therefore, understanding the wear resistance of the paint film is of great significance for the paint and varnish industry.