Glass surface long-acting anti-fog coating and preparation method thereof

Abstract

The invention belongs to the technical field of glass functional coatings, and discloses a glass surface long-acting anti-fog coating and a preparation method thereof. The preparation method comprisesthe following steps: coating a pretreated glass substrate with a hydrophobic layer solution composed of a silane compound containing 2-4 alkoxy groups, hydrophobic silica sol, amino-terminated hyperbranched polysiloxane and a low-boiling-point alcohol solvent, and carrying out preheating treatment at 50-100 DEG C to evaporate the alcohol solvent so as to obtain a hydrophobic layer; and then spraying a hydrophilic layer solution containing aliphatic epoxy resin, hydrophilic silica sol, an additive and a diluent, and carrying out heating curing treatment at the temperature of 100-200 DEG C to obtain the long-acting anti-fog coating. Amino-terminated hyperbranched polysiloxane is adopted as a spreading agent of the hydrophobic layer solution and a cross-linking agent of the hydrophilic layerat the same time, and the curing effect, light transmittance and antifogging durability of the hydrophilic anti-fog coating are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of glass functional coatings, in particular to a long-lasting anti-fog coating on glass surfaces and a preparation method thereof. Background technique [0002] Atomization of glass refers to the fact that water vapor in the air reaches saturation when cooled to its dew point, and condenses on the surface of glass products to form tiny droplets. These droplets refract and scatter light, resulting in the opacity of glass. The fogging of building glass windows, bathroom mirrors, and glasses will bring a lot of inconvenience to life, and the fogging of car windshields will seriously endanger driving safety. [0003] Anti-fog glass refers to the special physical or chemical treatment of ordinary glass to produce unique physical and chemical properties on the surface to prevent the surface of the glass from fogging, so as to achieve the effect of not affecting the visibility of the mirror image or the light trans...

AI Technical Summary

Problems solved by technology

However, the first coating solution of this patent mainly includes hydrolyzable siloxane compound, and the second coating solution mainly includes aliphatic epoxy resin. Although the hydrolyzed siloxane compound has good bonding force with the glass substrate, and the surface epoxy resin has Good hydrophilicity, but the compatibility between siloxy compounds and aliphatic epoxy resins is poor, resulting in unsatisfactory bonding between the connection layer and the hydrophilic layer, which affects the durability and anti-fog performance of the hydrophilic layer to play

Although the addition of a coupling agent helps to improve the bonding effect between the connecting layer and the hydrophilic layer, as a coupling agent in the second coating solution, it has limited interaction with the silane oxide compound in the first coating solution, and the improvement effect is limited.