Example 4: used as permanent anti fingerprint coating

The polysilazane used is a kind of all hydrogen polysilazane, the average molecular weight is 150-150 000, using di-n-butyl ether as solvent and palladium propionate with mass fraction (based on all hydrogen polysilazane) of 0.75% as catalyst, a 20% concentration of all hydrogen polysilazane solution is prepared, which is sprayed on a wire drawing stainless steel (3 cm × 3 cm), ventilated at room temperature for 10 minutes, and then dried After heat treatment (130 ℃, 1H) in the drying box, the film was cured. The thickness of the coating was 2.1 μ M. The coating can also be used for chrome plated plastic substrate, and its coating adhesion (DIN EN ISO 2409-2013) is grade 0; fingerprint resistance performance evaluation is to add fingerprint on the paint substrate, and then wipe it with cotton cloth, and then visually evaluate the ability of fingerprint removal. The results show that the fingerprints on the substrate coated with the coating can be easily removed completely, while the fingerprints on the same substrate without coating can not be removed completely no matter how much force is used. The long-term test of fingerprint resistance also shows that the coating can obtain satisfactory results. The test method is to store the coated substrate and uncoated substrate with fingerprints at room temperature for two weeks, and then wipe the coated and uncoated surfaces with isopropanol respectively to remove the fingerprints left on the surface. As a result, the fingerprints on the coated surface can be easily removed completely, while the fingerprints on the uncoated substrate are still visible Visible.