Anti-fog polyurethane film and preparation method thereof

Abstract

The invention discloses an anti-fog polyurethane film and a preparation method thereof. The preparation method comprises the following steps: mixing binary isocyanate and lysophosphatidylcholine, adding the mixture into an acetone solution containing a cross-linking agent, adding dimethylolpropionic acid, a chain extender and a catalyst, and reacting to obtain a prepolymer solution; adding polyether into the prepared prepolymer solution, uniformly mixing, treating at 120-150 DEG C for 20-30 minutes, heating to 200 DEG C, and casting to form a film, thereby obtaining a polyurethane film; and carrying out plasma treatment on the prepared polyurethane film to obtain the polyurethane film. According to the preparation method, lysophosphatidylcholine is grafted into diisocyanate molecules through a pre-polymerization method, and the surface of the prepared polyurethane film has a hydrophobic end and a hydrophilic end which are specific to phospholipid molecules, so that the surface tensionof the surface of a material to water can be effectively reduced, and water vapor cannot be condensed and fogged on the surface of the film; and the amphiphilic structure is dispersed in the whole film, so that when the film is chemically eroded or abraded, the formed new surface also has an anti-fog effect.

Description

technical field [0001] The invention relates to the field of anti-fog polyurethane materials, in particular to an anti-fog polyurethane film and a preparation method thereof. Background technique [0002] Glass has a wide range of uses in industrial production and daily life. However, when there is a certain temperature difference between the two sides separated from each other, and the saturated vapor pressure of the water on the surface with low temperature is lower than the vapor pressure of the surrounding environment, the water vapor will gather on the surface of the object and precipitate in the form of tiny water droplets to form fog. The tiny dewdrops diffuse the light, which significantly reduces the light transmittance of the glass. The fogging of glass windows of buildings, bathroom mirrors, and glasses will bring great inconvenience to life; the fogging of vehicle windshields in winter will bring serious harm to driving safety. From the perspective of the indus...

AI Technical Summary

Problems solved by technology

However, traditional polyurethane films do not have anti-fog properties

For the anti-fog technology of polyurethane film, there are generally two types: 1. Multi-layer composite is used, that is, the film with anti-fog function is formed on the surface of polyurethane film. This method is complicated; 2. Anti-fog agent or anti-fog The coating is covered on the surface of the polyurethane film. Due to the chemical action of the anti-fog agent or anti-fog coating, this method may cause the film itself to be eroded, resulting in a decrease in light transmittance, making it easier to be worn, and greatly shortening the service life of the film.

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