Abstract
This paper introduces the test method for determining the wear resistance of floor coatings by rubber grinding wheel method. This method quantifies the wear resistance of the rubber grinding wheel by specifying the rotational friction of the coating surface under load to specify the mass loss after the specified number of revolutions. This paper elaborates on the test principle, equipment composition, sample preparation, operation steps and result calculation, and discusses the key influencing factors, providing a standardized technical reference for the evaluation of coating durability in related industries.
Test Principle and Equipment
The core principle of the rubber grinding wheel method is to simulate the actual wear conditions. The specimen is in contact with and rubbed against a rotating rubber grinding wheel at a fixed vertical pressure, and its mass loss is calculated by measuring the mass difference between the specimen before and after friction. The smaller the mass loss per unit number of revolutions, the better the wear resistance of the coating. The main equipment includes wear resistance testing machine, standard rubber grinding wheel, weights and precision balances. The hardness and size of rubber grinding wheels must comply with the standards to ensure the consistency and comparability of test results.
Brief description of the operation steps
First, the coating specimen that meets the size requirements is prepared and adjusted. The specimen is fixed on the testing machine platform, a standard rubber grinding wheel is installed and the specified load is applied. Start the equipment to rotate the grinding wheel to rub the surface of the specimen according to the specified number of revolutions. After the test, the specimen is cleaned and weighed for weight. The same specimen is tested at least three times.
Calculation and presentation of results
Abrasion resistance is usually characterized by mass loss, calculated as follows:
Δm = m₁ - m₂
Δm is the mass loss (in milligrams), m₁ is the initial mass of the sample, and m₂ is the post-test mass. The final result is an arithmetic average of multiple tests, and the number of revolutions tested and the load conditions are indicated.
Discussion of key influencing factors
Test results are influenced by many factors. The coating itself includes resin type, filler type and content, curing degree, etc. Test conditions such as load size, grinding wheel hardness, total number of revolutions, and ambient temperature and humidity also directly affect the data. Ensure that the specimen is flat, the grinding wheel is clean, and the load is accurate during operation to reduce errors.
Applications & Precautions
This method is suitable for the comparison and quality control of wear resistance of various floor coatings, and provides a basis for material selection and formulation optimization. During the test, the equipment should be calibrated and the grinding wheel should be replaced regularly, and the experimental parameters should be controlled in strict accordance with the standard. There may be differences in the number of revolutions and load of different standards, and the standard version should be specified in the report.
Cite the article
GB/T 1768-2006 Colored paints and varnishes - Determination of wear resistance - Rotary rubber grinding wheel method
ASTM D4060-19 Standard Test Method for Abrasion Resistance of Organic Coatings by the Taber Abraser