Preparation method of transparent tin antimony oxide electric heating film

Abstract

The invention provides a preparation method of a transparent tin antimony oxide electric heating film, which belongs to the field of thin-film materials. The preparation method comprises the steps that tin and antimony raw materials and an additive are dissolved in a solvent to form a solution; a pH value of a system is adjusted to be neutral or slightly alkaline; the solution is put in an ultrasonic atomizer; a nozzle of the ultrasonic atomizer is positioned at the top of an electric box furnace; glass tubes or ceramic tubes to be coated are placed on a rack orderly and vertically; the rack on which the glass tubes or the ceramic tubes are placed is placed in the electric box furnace; a door of the electric box furnace is closed; the electric box furnace is switched on; the ultrasonic atomizer is switched on; and drops of the solution containing tin and antimony are deposited on the external surfaces of the glass tubes or the ceramic tubes uniformly to form transparent tin antimony oxide conductive films. The glass tubes or the ceramic tubes coated with the transparent tin-antimony oxide conductive films can be used as heating elements for heating liquid, gas, solid and the like.

Description

technical field [0001] The invention provides a method for preparing a tin antimony oxide transparent electrothermal film, which belongs to the field of thin film materials. Background technique [0002] The electric heating film is an electric heating element that directly converts electric energy into heat energy. It is a layer of conductive film attached to the surface of insulating materials such as enamel, glass, ceramics and plastics. After it is energized, it can convert electrical energy into heat energy by using the principle of resistance heating. Like electric heating tubes, electric heating rods, electric heating plates, electric heaters, rice cookers, induction cookers, etc., it is an integral part of the huge family of electric heating products. Metal tin oxide electrothermal film material has surface heating, high electrothermal conversion efficiency, no open flame, corrosion resistance, wear resistance, small size, light weight, strong heat release capacity,...

AI Technical Summary

Problems solved by technology

Chinese patent CN1082803A pointed out that pure tin antimony oxide electrothermal film has poor high temperature thermal stability, and the phenomenon of performance decay after long-term use proposes to solve the above problems by adding other metal ions to the above tin antimony oxide component.

Chinese patent CN1174487A proposes to add other ions to the tin antimony oxide component to solve the above defects in view of the poor thermal stability of the tin antimony oxide electrothermal film and the small application range of the film layer resistance

Chinese patent CN1402594A pointed out that in the production of tin oxide fluorine electrothermal film, the spray gun spraying method used in the past had poor atomization uniformity of the spray gun, the sharp influence (decrease) of the flow rate of high-pressure atomized droplets on the substrate temperature, and the shape of the spray gun was easy to change during the spraying process. The change of the shape of the spray droplets, which makes the performance of the tin oxide electrothermal film unstable, proposes the method of making the tin oxide fluorine electrothermal film by ultrasonic spraying

Chinese patent CN2590322Y proposes an electrothermal film spraying machine in view of the large randomness of manual operation in the above patents, uneven thickness control of the electrothermal film, and poor adhesion between the film and the substrate.

Although the method of adopting tin tetrachloride and antimony trichloride as raw materials has the advantages of cheap raw material price and simple operation, there is a strong acidity in the raw material solution system (generally, the pH value is less than 0), and the solution holding container, spray gun, Heat treatment furnaces, fans, discharge pipes, etc. all produce strong acid corrosion

At the same time, high-concentration chloride ions will also cause strong corrosion to spray guns, heat treatment furnaces, fans, and discharge pipes in the high-temperature environment of spraying deposited films

The operating environment for employees is also extremely unfavorable

In addition, there is the problem of uneven spray droplets in the method of spraying with the air carrier gas of the air compressor, which causes the unevenness of the deposited film and seriously affects the various properties of the film.

The entry of a large amount of air reduces the actual temperature during film deposition, resulting in incomplete crystallization during film deposition, which leads to performance attenuation of the prepared film during use

The existing tin oxide electric heating film basically adopts the method of workers manually operating the spray gun, which leads to uneven spraying parameters such as spray gun position, spraying time, spraying direction, etc., and also causes inconsistency in various index parameters of the obtained film, which seriously affects the quality of the film. quality

The tin-fluorine oxide film that uses fluorine instead of antimony has the instability of fluorine ions in the film (because fluorine is an anion and will volatilize)