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Composite metal electrothermal film sol and method for producing electroheating tube with the same

A composite metal, electrothermal film technology, applied in the direction of heating element materials, etc., can solve the problems of ignition breakdown, change of crystal electrical characteristics, environmental pollution, etc., to improve the withstand capacity of voltage and power, improve hardness and strength, avoid Effects of air pollution

Inactive Publication Date: 2005-12-14
冷同桂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the electric heating film made of it can only be used within 220V and the power is not greater than 10W / cm 2 It is used for about 500h under normal conditions, and the service life is short, which limits the range and effect of electric heating film technology and end products.
The reason is that when the electrothermal film sol or gel prepared from the above-mentioned raw materials is thermally sprayed in an environment rich in oxygen in natural air, while oxygen reacts with metal ions to form metal oxide semiconductor crystals, the thermal reaction process must be in the crystal. Excess oxygen ions are generated in the "lattice" of the crystal lattice. When the temperature drops or precipitates or is heated by electricity, the oxygen ions in the lattice gradually "escape", and excessive negative ion vacancies gradually appear. If there is not enough active Metal ions give vacancies to fill. Due to the ion vacancies, under a certain external stress or under the action of crystal internal stress, the accumulation of "lattice" will gradually occur, which will gradually cause changes and inconsistencies in the electrical characteristics of the crystal on the homogeneous surface. When Crystal stress release or accumulation changes will occur after 220Vac is powered, which is manifested as when the surface temperature of the film reaches 200°C or above or after several hours of continuous electrification (some are set to 30min), local spark breakdown occurs and the electrothermal film is scrapped
Moreover, the metal tin used in the electrothermal film needs to be indirectly produced by tin tetrachloride, the production efficiency is low, and the environment is polluted due to the generation of hydrogen chloride gas during the reaction process.
[0003] Secondly, in the configuration process of the above-mentioned sol or gel, there are defects in the reaction temperature, time, agitation adequacy, and operation links, mainly manifested in the influence of low reaction temperature, insufficient time, insufficient agitation, and impurities other than metals. The structural density, uniformity and homogeneity of the membrane are affected, which in turn affects the life of the membrane. About 50% of the membranes have a life span of less than 500h
[0004] In addition, each operation in the above method will produce a large amount of waste liquid, such as: the Cl-containing waste liquid that is poured out after centrifugation - Mixed solution of water, ammonia water, ethanol, etc., washing to remove Cl - Wastewater, etc., directly discharged into the sewer will cause a certain degree of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: A composite metal electric heating film sol. The composition of the sol is prepared with the following parts by weight of raw materials: 15 parts of nano-sized tin powder, 7.5 parts of antimony trichloride, 3 parts of stannous chloride, chlorine 0.07 parts of gold, 0.07 parts of germanium tetrachloride, 1.6 parts of silver chloride, 0.7 parts of nickel chloride, 3 parts of copper chloride or zinc chloride, 3 parts of sodium chloride or potassium chloride, 45 parts of deionized water, 189.4 parts of ethanol. After the sol of this formula is made into an electric heating film, its withstand voltage strength is 450Vac, and its withstand power strength is 25W / cm 2 , The temperature intensity of 750 ℃ ​​to withstand the heat of dry burning. In the film power intensity 25W / cm 2 , The water flow rate is 0.5L / min, the standard voltage is 250Vac, and the film surface temperature is 450℃. Continuously energize and run with water for 5000h without damage.

Embodiment 2

[0029] Example 2: A composite metal electric heating film sol, the composition of the sol is prepared with the following parts by weight of raw materials: 8 parts of nano-sized tin powder, 4 parts of antimony trichloride, 1 part of stannous chloride, chlorine 0.01 part of gold, 0.01 part of germanium tetrachloride, 0.8 part of silver chloride, 0.1 part of nickel chloride, 7 parts of copper chloride or zinc chloride, 7 parts of sodium chloride or potassium chloride, 24 parts of deionized water, 99.2 parts of ethanol. Its withstand voltage strength is 250Vac, and its withstand power strength is 10W / cm 2 .

Embodiment 3

[0030] Example 3: A composite metal electric heating film sol, the composition of the sol is prepared with the following parts by weight of raw materials: 20 parts of nano-sized tin powder, 10 parts of antimony trichloride, 4 parts of stannous chloride, chlorine 0.1 part of gold, 0.1 part of germanium tetrachloride, 2 parts of silver chloride, 1 part of nickel chloride, 2 parts of copper chloride or zinc chloride, 2 parts of sodium chloride or potassium chloride, 60 parts of deionized water, 312 parts of ethanol. Its withstand voltage strength is 110Vac, and its withstand power strength is 20W / cm 2 .

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Abstract

The compound metal electrothermal film sol is prepared with nanometer level tin powder 8-20 weight portions, antimony trichloride 4-10 weight portions, stannous chloride 1-4 weight portions, gold chloride 0.01-0.1 weight portions, germanium tetrachloride 0.01-0.1 weight portions, silver chloride 0.8-2 weight portions, nickel chloride 0.1-1 weight portions, copper chloride or zinc chloride 2-7 weight portions, sodium chloride or potassium chloride 2-7 weight portions, deionized water 24-60 weight portions and ethanol 99.2-312 weight portions. The sol may be prepared into electrothermal film with high electricity-to-heat conversion efficiency, and other advantages. The present invention also discloses the method of making electrothermal pipe with the sol, and the making process is simple and practical and has less environmental pollution.

Description

Technical field [0001] The invention relates to the technical field of electric heating films, in particular to a composite metal electric heating film sol; the invention also relates to a method for manufacturing an electric heating tube using this sol. Background technique [0002] The electric heating film is a new type of electric heating device, which has been widely used in the field of electric heating because of its main characteristics such as water and electricity isolation and fast power saving. A well-known electric heating film made of tin dioxide, antimony pentoxide, indium trioxide and oxide resistance modifier with particle diameters of 16-18 nm as raw materials has the above-mentioned characteristics. However, the electric heating film made with it can generally only be within 220V and the power is not more than 10W / cm 2 It is used for about 500h in the normal state, and the service life is short, which limits the use range and use effect of the electric heating ...

Claims

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Application Information

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IPC IPC(8): H05B3/12
Inventor 冷同桂刘明一官明茹
Owner 冷同桂
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