Paints and varnishes paint film cross-cut test (GB/T 9286)

Introduction

In the painting industry, coating adhesion is one of the important criteria for evaluating painting mass and durability. In order to objectively measure the adhesion performance of coatings in different situations, the GB/T 9286 standard provides a cross-cut test method to evaluate the adhesion of paint films by cutting coatings and observing the degree of peeling from the substrate. This article will introduce the principle, operation steps of this test method in detail, and its significance in the field of painting.

1. Test principle

The GB/T 9286 standard paint film cross-cut test method is a way to evaluate the adhesion performance of coatings by cutting them and observing the degree of peeling from the substrate. This method uses cross-cut tools with different spacings to cut a grid pattern on the surface of the coating, so that the tool just penetrates to the substrate. Then, according to the area of the coating peeling from the cross-cut area, the adhesion performance is divided into 0 to 5 grades, 0 grades are recommended, and 5 grades are the worst.

2. Operation steps

Select the tool: according to the different substrate and coating thickness, select the appropriate single or multi-blade spacing to ensure accurate cutting effect.

Prepare the template: Spreader the coating evenly on the hard substrate to ensure that the film thickness is suitable for the selected tool.

Cutting coating: The tool is perpendicular to the surface of the template for uniform cutting. According to the coating thickness and substrate type, different times and directions of cutting are carried out.

Adhesive tape: Paste transparent Pressure sensitive adhesive tape on the hard substrate, and then press lightly to ensure that the adhesive tape is in full contact with the paint film.

Tear off the adhesive tape: Tear off the adhesive tape at an appropriate angle within the specified time. Observe the peeling of the paint film.

3. Significance and application

GB/T 9286 The paint film cross-cut test method has important significance and application value in the painting industry. By simulating the cutting of coatings and observing their adhesion performance, this method can detect the bonding problem between coatings and substrates early, providing an important quality control method for painting enterprises. The adhesion performance of coatings is directly related to the service life and Reliability of painting products, so this test method plays an irreplaceable role in coating process optimization, material selection and mass evaluation.

4. Precautions

Ensure the sharpness of the cutting edge of the tool for accurate cutting results.

Select the appropriate tool and cutting times according to the coating thickness and substrate type.

After cutting, the adhesive tape is attached and torn off in time to avoid external interference of the coating.

5. Summary

The cross-cut test method of paint film in GB/T 9286 standard is one of the important adhesion evaluation methods in the painting industry. By cutting coatings and observing their peeling conditions, this method can accurately evaluate the adhesion performance of coatings and provide scientific and reliable quality control methods for painting enterprises. This test method plays an irreplaceable and important role in coating process improvement, Coating performance evaluation and product mass assurance.