High-temperature electrothermal coating and preparation method thereof

Abstract

The invention discloses a high-temperature electrothermal coating and a preparation method thereof. The high-temperature electrothermal coating is prepared from the following components in percentageby mass: 5 to 50 percent of first electrothermal filler, 0 to 10 percent of second electrothermal filler, 10 to 40 percent of high-temperature-resistant adhesive, 0.1 to 10 percent of high-temperature-resistant filler, 1 to 10 percent of dispersing agent, 0.1 to 10 percent of functional additive and the balance of water. The high-temperature electrothermal coating has the advantages of low resistivity, good storage stability, high heating rate, excellent heat conversion efficiency and the like; the heating temperature can reach 200-600 DEG C in a short time, all the component materials are kept stable and not oxidized at the high temperature, it can be guaranteed that the long-term use temperature is about 300 DEG C, the heating condition is evenly distributed, and power decline does not occur after long-term use; in addition, the method for preparing the high-temperature electrothermal coating is simple in process, safe, environmentally friendly, low in cost and suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a high-temperature electrothermal coating and a preparation method thereof. Background technique [0002] As a kind of functional coating, electrothermal coating is a new type of functional coating with excellent electrothermal properties developed on the basis of conductive coating. It can be covered on the surface of the object to be heated or on any surface like paint for heating. Since it can be directly covered on the surface of the substrate, it has extremely high thermal efficiency. Compared with electric heaters, electric heating coatings have the advantages of long service life, convenient power saving, safety and reliability, etc., and have broad application prospects in all aspects of production and life, such as building heating, industrial oven drying, petrochemical pipelines Insulation, etc. With the continuous development of the technology industry, the performance requir...

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Problems solved by technology

Metal systems have good electrical conductivity, but they are relatively easy to oxidize, which will seriously affect the electrical conductivity of the coating, thereby affecting the heating effect of the coating, and the high cost of metal powder severely limits its practical application. In addition, due to the density of metal powder Relatively large, the paint will have the problem of settlement; carbon-based fillers have the advantages of light weight, non-toxic and harmless, not easy to oxidize, and low price. They are widely used in electric heating coatings at home and abroad, but there is still a gap between carbon-based electric heating performance and metal , the resistivity is larger than metals such as silver, copper, nickel, aluminum, etc., which makes the carbon-based electrothermal coating heat up slowly and the temperature is not high, so it is difficult to be widely used

If the resistance value is reduced by increasing the content of conductive fillers, the adhesion of the coating will decrease and the service life of the coating will be affected

At present, several patents of electrothermal coatings are disclosed on the market. They mainly use carbon powder and graphite as fillers. The problem is that the resistance of these electrothermal coatings is above tens of ohms. The adhesion of the coating becomes poor, the heating efficiency is relatively low in actual use, and a higher voltage (higher than the 36 volt safe voltage) is required, which is not conducive to practical application

[0004] Most of the electrothermal coatings in the prior art have low surface heating temperature, slow heating rate, uneven heating temperature, low heating efficiency, the highest temperature is less than 200°C, poor heat resistance and aging resistance, and are easy to use for a long time. Defects such as power decline and relatively short working life severely restrict the rapid development of electrothermal coatings and their application in many fields

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