Super-hydrophilic antifogging coating and preparation method thereof

Abstract

The invention discloses a preparation method of a super-hydrophilic antifogging coating, which comprises the following steps: hydrolyzing a silane precursor to obtain a solution a; adding nano silicon dioxide powder into a solvent, and carrying out ultrasonic dispersion to obtain a suspension b; adding the solution a into the suspension b, and performing ultrasonic dispersion to obtain a mixed solution c; and coating a base material with the mixed solution c, and conducting baking to obtain the super-hydrophilic antifogging coating. The invention further discloses the super-hydrophilic antifogging coating. According to the invention, the selected components of the silane precursor and the catalyst are creatively improved, and the molar ratio, the mass ratio or the volume ratio of the components are strictly controlled, so that the coating has excellent surface hydrophilicity, antifogging property and mechanical property. The selected silane precursor combination contains amino, a sol with a three-dimensional network structure and a hydrophilic group is formed through a reaction, the sol and nano-silica particles are mixed, then the hydrophilic group can be grafted on the surface of the nano-silica, and the super-hydrophilic performance of the super-hydrophilic antifogging coating is further improved.

Description

technical field [0001] The invention relates to the technical field of surface modification of transparent substrates, in particular to a superhydrophilic anti-fog coating and a preparation method thereof. Background technique [0002] Fogging refers to the phenomenon that water vapor condenses on the surface of an object when the surface temperature of the object is lower than the dew point. At this temperature, when the contact angle of the condensed water droplets on the surface of the substrate is large (>40°), it will scatter the light passing through the substrate greatly, causing the transparent object to appear blurred. Fogging will seriously affect applications such as automotive glass, medical equipment, and optical components. Therefore, the preparation and development of anti-fog coatings are of great significance and practical value for applications in these fields. [0003] At present, the main anti-fog methods include: ① coating surfactant on the surface o...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent application number 202110616163.2 discloses a lens preparation method with anti-fog and antibacterial functions, by using titanium dioxide (TiO 2 ) The photocatalytic performance of the particles makes the lens have good hydrophilicity and anti-fog performance, but the hydrophilicity of this technology depends on TiO 2 The photocatalytic properties of the particles need to be exposed to ultraviolet light to obtain high hydrophilicity, thus reducing the practicality of the technology

Another example, application number is the Chinese patent of 201010533381.1 has announced a kind of hydrophilic silicon dioxide (SiO 2 ) The preparation method of anti-fog coating, by preparing mesoporous SiO 2 Particles, as well as the electrostatic self-assembly process, prepare a layer of transparent anti-fog coating on the glass substrate, but this coating requires long-term high-temperature calcination, and the coating preparation cost is high

For another example, the Chinese patent application number 202010872334.3 uses different silanes as precursors to prepare an anti-fog coating by plasma chemical vapor deposition process. The coating has good anti-fog performance, but plasma chemical vapor deposition technology requires the use of expensive equipment , thereby increasing the preparation cost of the coating

[0005] There is also a published Chinese patent (application number 201910449053.4) using a coupling agent with carbon-carbon double bonds to pre-treat nano-silica particles, so that carbon-carbon double bonds are grafted onto nano-silica particles, thereby improving surface activity, thereby Finally, the hydrophilic group is grafted onto the nano-silica particles, so that the surface has a hydrophilic group so that the coating has anti-fog performance, and the prepared coating has a double-layer structure, the double-layer structure mainly lies in the bottom layer is Polysilazane resin, the surface layer is made of silica particles, through multiple coating-drying processes, the surface has a rough structure, and then treated by ultraviolet curing, hydrophilic groups are grafted on the surface to improve the hydrophilicity of the coating However, this process is complex and time-consuming, making it difficult to apply to mass production