Sealer primer is a special coating, usually used to seal or isolate stains, pollutants or other defects on the surface of the substrate, so as to facilitate the construction of subsequent coatings and improve the adhesion of coatings. The sealing primer usually has good filling, smoothness and durability, and can effectively seal the pores, cracks, burrs, etc. on the surface of the substrate, and at the same time improve the anti-penetration, anti-rust, anti-corrosion and other properties of the coating. Sealing primers are widely used in construction, automobiles, ships, industrial equipment and other fields, and can provide a good foundation and protection for subsequent coatings.
Test performance items
| performance | Test items |
|---|---|
| drying time | coating drying time |
| weather resistance | UV resistance, water resistance, corrosion resistance, etc. |
| Adhesion | The degree of bonding between the coating and the substrate |
| Flatness | Flatness and gloss of the coating surface |
| filling | Filling capacity and sealing effect |
| chemical resistance | Acid and alkali resistance, solvent resistance, heat resistance, etc. |
| density | Coating density |
| other | Such as dry film thickness, antibacterial properties, electrical insulation properties, etc. |
Detection method
The following are common detection methods for sealing primers:
Drying time: Use a device such as a drying time Tester to measure how long it takes for the coating to dry.
Weather resistance: test the UV resistance, water resistance, corrosion resistance, etc. of the coating through artificial accelerated aging test or natural climate exposure.
Adhesion: The degree of bonding between the coating and the substrate is tested by cross-hatch method, peeling method, tensile method and other methods.
Flatness: Use parallel plate method, gloss meter and other equipment to test the flatness and gloss of the coating surface.
Filling: Test the filling ability and sealing effect of the coating by observing or using scanning electron microscope and other equipment.
Chemical resistance: Use acidity meter, alkalinity meter, solvent immersion and other methods to test the acid and alkali resistance, solvent resistance, heat resistance, etc. of the coating.
Density: Measure the density of the coating using an instrument such as a densitometer.
Others: According to the specific type of sealing primer and testing items, select appropriate testing methods and equipment for testing, such as measuring dry film thickness, testing antibacterial properties, electrical insulation properties, etc.
Beichao reminds you: the performance test of the sealing primer needs to be carried out in accordance with relevant standards and methods to ensure the accuracy and comparability of the test results.
