1. Introduction

As a commonly used coating material in construction and industry, the quality of paint film directly affects the flatness and aesthetics of the coated surface. In the coating process, it is often necessary to polish the surface of the coating film to achieve a smoother, no light, no particles effect and improve the quality of the coating. This paper will introduce the paint film grinding determination method in detail, including definition, purpose, relevant standards, key points of testing method, equipment, operation points, result judgment and precautions.

2. Definition, purpose and meaning

The sanding method of paint film refers to the grinding of paint film or putty layer, the use of different materials such as pumice stone, sandpaper, etc., and different grinding methods such as dry grinding or wet grinding, to assess the difficulty of producing a smooth and dull surface of the paint film surface. Its purpose is to measure the flatness of the paint film after grinding, which is an important performance index for layers such as primer and putty. The grinding performance of the paint film directly affects the quality of construction, and also improves the protection and adhesion of the film.

Summary notes on the method of determining the sandibility of paint film

3. Relevant standards

GB/T 1770 is the relevant standard for the determination of the sanding property of primer and putty film, and provides the specification and guidance for the determination of the sanding property of paint film.

4. Introduction of key points of inspection methods

4.1 Measurement principle

By grinding the film and observing the surface phenomenon of the film, the grinding property of the film is evaluated.

4.2 Instruments and Equipment

The measurement is carried out using a sanding tester, which is commonly found in laboratories and painting sites and can effectively simulate the sanding process in actual construction.

Summary notes on the method of determining the sandibility of paint film

4.3 Operation Points

Install the specified type of water sandpaper on the grinding head of the instrument, add a certain load, and then place the sample to be measured on the magnetic work table. The grinding head is carried out reciprocating movement, and the surface phenomenon of the template is observed after a certain number of times. When sanding by hand, use water sandpaper to evenly rub the template. You can choose dry or wet grinding.

4.4 Result Determination

Evaluate the results with two similar samples to determine whether the surface is uniform, smooth and dull, and whether there are non-abrasive particles or heating and softening phenomena.

4.5 Precautions

When manual grinding, it is necessary to pay attention to the uniformity of force and grinding speed, and the specified type of water sandpaper should be selected to ensure the accuracy of measurement.

Summary notes on the method of determining the sandibility of paint film

5. Application and significance of the method

The test method of paint film sandability provides an effective means to evaluate the flatness and construction quality of paint film. Through the appropriate grinding method and technology, the surface of the paint film can be smooth and no particles, improve the decorative effect and adhesion of the film, and protect the substrate.

6. Conclusion

The sanding test of paint film is an important method for evaluating the surface smoothness of paint film. Through this method, the grinding performance of the coating film can be mastered, and reliable data and guidance can be provided for the improvement of construction quality and coating property. In the painting project, the reasonable use of the paint film grinding determination method is helpful to achieve a higher level of construction quality and decorative effect.