Intelligent heat-insulating film and its preparing process

Abstract

The invention relates to an intelligent heat-insulating film and a preparation method thereof. The invention adopts the mixture of phase transition intelligent nanometer powder in the rutile crystal structure and vanadium dioxide V1-XO2(X is more than 0 and less than 0.06) to uniformly disperse on a material which can be formed into films, thus preparing the intelligent heat-insulating film with the phase transition function. The intelligent heat-insulating film is a novel energy-saving material with the phase transition temperature adjustable within -10 DEG C to 70 DEG C. The film has high infrared transmittance and low reflectivity as well as excellent heat-insulating property at low temperatures. At high temperatures, the film has low infrared transmittance and high reflectivity as well as excellent heat insulating effect. The intelligent heat-insulating film can be used for heat-insulation and decorative-protection of the surfaces such as glass, plastic, metal, wood, concrete and so on.

Description

technical field [0001] The invention relates to the fields of chemical industry and materials, in particular to an intelligent thermal insulation film with adjustable phase transition temperature and a preparation method thereof. Background technique [0002] In order to reduce solar radiation and achieve the purpose of saving energy, people use various methods to change the light transmission performance of materials. Automobile glass film can block sunlight radiation, reduce the damage of ultraviolet rays to the human body, reduce the temperature of the surfaces and air in the car, slow down the aging of facilities in the car, improve the riding environment of the passengers, and reduce the fuel consumption of the car. Some building energy-saving glass also achieves the purpose of blocking sunlight radiation and reducing air-conditioning energy consumption by coating metal film (aluminum, silver, etc.). [0003] Existing studies have shown that some metal oxides have good...

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Problems solved by technology

These methods have many disadvantages, such as: expensive equipment, ordinary glass or plastic can not withstand high temperature, it is difficult to control the valence state and crystal form of vanadium, it is difficult to make a large-area film, and the gel film produces pores, etc.

[0006] However, its application is limited due to its resistance phase transition temperature of 68°C higher than room temperature. Therefore, the resistance mutation temperature can be reduced, and the phase transition temperature can be reduced by doping other metal elements into vanadium dioxide.

For example, U.S. Patent US6358307 reports a method for synthesizing tungsten-doped vanadium dioxide, but this method may not be uniform due to the fact that ammonium tungstate and ammonium vanadate are not mixed at the atomic level, and the decomposition process is a redox process, which may result in V n o 2n+1 and V n o 2n-1 Two sets of non-integer ratio compounds, which make VO 2 The valence state is not accurate enough, and the powder is stacked together, relying on NH 3 It is difficult to ensure the uniformity of the product due to the diffusion

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