Sodium-alginate-based temperature-sensitive polymer aquagel smart dimming film and preparation method thereof

Abstract

The invention discloses a smart dimming film and a preparation method thereof. A temperature-sensitive polymer and various assistants are dissolved in a sodium alginate aquagel main body without temperature-sensitive effect to obtain a smart dimming film with certain mechanical strength and favorable temperature sensitivity. The preparation method comprises the following steps: preparing the temperature-sensitive polymer, various assistants, sodium alginate and the like into a water solution, and adding a water-insoluble multivalent metal salt and an acid-releasing agent to slowly form a cross-linked gel, thereby obtaining the smart dimming film. The preparation method disclosed by the invention is simple to operate and low in cost, and can be performed at room temperature; and the obtained smart dimming film has certain strength and favorable temperature sensitivity.

Description

technical field [0001] The invention relates to an intelligent dimming film that can automatically adjust light transmittance according to changes in ambient temperature and a preparation method thereof, which can be applied to windows of buildings or vehicles, greenhouses, or transparent roofs of certain building venues. Solar heat collector. Background technique [0002] The effective lighting of indoor spaces such as buildings and vehicles and solar thermal collectors is one of the elements of daily life in human society and the development of a green and low-carbon economy. In recent years, as countries around the world pay more attention to green energy and low-carbon economy, the effective use of solar energy and the development of energy-saving and environmentally friendly materials have attracted widespread attention. For buildings and vehicles, reasonable indoor lighting and window layout design can effectively avoid unnecessary power consumption (lighting and heat...

AI Technical Summary

Problems solved by technology

Although the above-mentioned solid hydrogels reported as temperature-sensitive polymer carriers overcome the inherent shortcomings of liquid polymer solutions, they also have some shortcomings: for example, although the PVA system can impart high elasticity and toughness, the author has confirmed that its In low temperature environment, especially in winter, it is easy to crystallize and precipitate, which leads to irreversible turbidity of the film; although xanthan gum, carrageenan or gellan gum can solidify the temperature-sensitive polymer solution, they are only cross-linked by physical action, and their mechanical properties are difficult. Reach the requirements of being used alone as a film; although agarose hydrogel has a certain strength, it is necessary to mix all film-forming raw materials evenly in a high-temperature environment during the preparation process, and then transfer it to a mold to cool to form a film. Due to the temperature-sensitive polymerization at high temperature If the material aggregates, ultrasonic vibration is required to ensure its uniform dispersion, and the entire operation needs to be completed at high temperature, which undoubtedly increases energy consumption and cumbersome operation