This invention states a preparation method of cesium tungsten bronze powder and a function film. The preparation method of the cesium tungsten bronze powder comprises the following steps: carrying out an exchange treatment on tungstate solution and cationic resin to obtain tungstic acid sol; adding citric acid solution and cesium carbonate solution in the tungstic acid sol and then carrying out a mixing treatment to obtain hydrothermal reaction precursor solution; carrying out a hydrothermal reaction on the hydrothermal reaction precursor solution; after the reaction is finished, carrying out a washing treatment and a drying treatment to obtain the cesium tungsten bronze powder. The function film disclosed by the invention contains the cesium tungsten bronze powder prepared by the preparation method of the cesium tungsten bronze powder disclosed by the invention; according to the preparation method of the cesium tungsten bronze powder disclosed by the invention, by controlling reactants and carrying out hydrothermal method, the preparation process is effectively simplified and the production cost of the cesium tungsten bronze powder is reduced; moreover, the cesium-bronze produced under a specific hydrothermal reaction condition has excellent shielding performance for infrared ray, particularly for near-infrared ray.

 

Infrared light, also called infrared, is the wavelength of electromagnetic waves between the microwave and visible between the wavelength of 760 nanometers (nm) to 1 millimeter (mm) between the non-visible light longer than red light, according to the wavelength, it can be divided into near infrared, mid-infrared and far infrared. Infrared light is particularly obvious near-infrared thermal effects, easily lead to warming temperatures, resulting in the car or indoor temperature.Infrared (IR) is invisible radiant energy, electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 700 nanometers (frequency 430 THz) to 1 mm (300 GHz) (although people can see infrared up to at least 1050 nm in experiments). Most of the thermal radiation emitted by objects near room temperature is infrared. Infrared radiation is used in industrial, scientific, and medical applications. Night-vision devices using active near-infrared illumination allow people or animals to be observed without the observer being detected. Infrared astronomy uses sensor-equipped telescopes to penetrate dusty regions of space, such as molecular clouds; detect objects such as planets, and to view highly red-shifted objects from the early days of the universe. Infrared thermal-imaging cameras are used to detect heat loss in insulated systems, to observe changing blood flow in the skin, and to detect overheating of electrical apparatus. Thermal-infrared imaging is used extensively for military and civilian purposes. Military applications include target acquisition, surveillance, night vision, homing and tracking. Humans at normal body temperature radiate chiefly at wavelengths around 10 μm (micrometers). Non-military uses include thermal efficiency analysis, environmental monitoring, industrial facility inspections, remote temperature sensing, short-ranged wireless communication, spectroscopy, and weather forecasting.

 

Thus, to the corresponding infrared unfavorable, especially in building construction and automotive glass were foil. And with the popularity of car beauty, the film is an indispensable part. Using a membrane can not only insulation, but also to prevent solar radiation, prevent skin diseases, greatly extending interior decoration use time while making the indoor temperature is relatively constant.

 

The present near-infrared shielding material disclosed generally refers to a strong absorbing or reflecting near-infrared light without affecting a functional film material through which visible light as transparent insulation materials, building energy efficiency and green automotive glass the area of insulation has a very broad application prospects. It has reported a strong inorganic material having a near infrared absorbing or reflecting property is mainly focused on conductive oxides, such as antimony tin oxide (ATO), indium tin oxide (ITO) and aluminum zinc oxide (AZO), etc., such a conductive oxide shielding film was generally greater than 1500nm wavelength of near-infrared light. The cesium tungsten bronze powder (Cs_xWO₃) having a near-infrared shielding performance in recent years was discovered, which may be masking a wavelength greater than 1500nm near-infrared light, which has more excellent near-infrared shielding properties. However, at present the process is complicated and costly problem of preparation of cesium tungsten bronze powder. And cesium tungsten bronze powder preparation of the near-infrared shielding performance is not ideal.

 

The object of the present invention to overcome these shortcomings of the prior art, to provide a solar film and its preparation method to overcome the cesium tungsten bronze powder prepared by conventional methods process complexity, high cost and technical problems.
 

In order to achieve the above object, the technical scheme of the present invention are as follows: a method for preparing cesium tungsten bronze powder, comprising the steps of: tungstate solution with a cation exchange resin to give tungstate sol; To the said acid sol was added citric acid solution, after mixing cesium carbonate solution to give the hydrothermal reaction precursor solution; the hydrothermal reaction precursor solution at a temperature 160-180 ° C, a pressure of 0.8-1MPa hydrothermal after the reaction, until completion of the reaction, washing process and drying process, to give a cesium tungsten bronze powder.

 

And, a functional membrane, the functional film containing cesium tungsten bronze powder material preparation process according to the present invention is cesium tungsten bronze powder preparation.

The present invention is preparing cesium tungsten bronze powder through the reactant control, combined with hydrothermal be prepared to effectively simplify the preparation process and reduce the cesium tungsten bronze powder production costs. And in this particular hydrothermal reaction conditions produced cesium tungsten bronze infrared, near-infrared shielding particularly excellent performance.

 

The functional film of this present invention contains cesium tungsten bronze powder prepared by the method of the present invention to prepare cesium tungsten bronze powders, so it has great performance in infrared, especially near-infrared shielding and the cost is relatively low.