introduction

In the coating industry, coating adhesion is one of the important criteria to evaluate the quality and durability of coating. In order to objectively measure the adhesion of the coating under different conditions, the GB/T 9286 standard provides a grid test method to assess the adhesion of the paint film by cutting the coating and observing the degree to which it falls off the substrate. This paper will introduce in detail the principle and operation steps of this test method, as well as its important significance in the field of coating.

Marking test for paint and varnish film (GB/T 9286)

1. Test the principle

The GB/T 9286 paint film grid test method is a way to evaluate the adhesion of the coating by cutting the coating and observing how much it falls off the substrate. The method uses a grid cutter with different spacing to cut a grid pattern on the surface of the coating so that the cutter penetrates exactly to the substrate. Then, depending on how much area the coating falls off from the grid area, the adhesion performance is rated from 0 to 5, with 0 being recommended and 5 being the worst.

2. Procedure

Select the tool: According to the substrate and coating thickness, choose the appropriate single or multiple blade spacing to ensure the accurate cutting effect.

Prepare template: Evenly apply the coating to the hard substrate, ensuring that the film thickness is suitable for the selected tool.

Cutting coating: Place the tool perpendicular to the template surface and cut evenly. Depending on the thickness of the coating and the type of substrate, different times and directions of cutting are performed.

Adhesive tape: Paste transparent pressure-sensitive adhesive tape on the hard substrate, and then gently press to ensure that the adhesive tape is fully in contact with the paint film.

Tear off the adhesive tape: in the specified time, at the appropriate Angle to tear off the adhesive tape. Observe the shedding of paint film.

Marking test for paint and varnish film (GB/T 9286)

3. Meaning and application

GB/ T9286 paint film marking test method has important significance and application value in painting industry. By simulating the cutting of the coating and observing its adhesion performance, the method can detect the bonding problem between the coating and the substrate early, and provide an important means of quality control for coating enterprises. The adhesion performance of the coating is directly related to the service life and reliability of the coated product, so this test method has an irreplaceable role in the optimization of the coating process, material selection and quality assessment.

4. Precautions

Ensure the sharpness of the cutting edge of the tool to obtain an accurate cutting effect.

Select the appropriate tool and number of cuts according to the coating thickness and substrate type.

After the cutting is completed, the adhesive tape is pasted and torn off in time to avoid external interference on the coating.

Marking test for paint and varnish film (GB/T 9286)

Step 5 Summarize

The paint film grid test method in GB/T 9286 standard is one of the important adhesion evaluation methods in the painting industry. By cutting the coating and observing its shedding, this method can accurately evaluate the adhesion performance of the coating, and provide scientific and reliable quality control means for coating enterprises. This test method plays an irreplaceable role in the improvement of coating process, evaluation of coating properties and product quality assurance.